Hot auxiliary air type lithium battery negative electrode powder stripping, sorting and recycling device

Abstract

The utility model discloses a hot auxiliary air type lithium battery cathode powder stripping, sorting and recycling device which comprises a feeding cabin, a pyrolysis cabin, a gas distribution cabin, an analyzer, a cooling cabin, a discharge hopper, a linear sieve, a heating and auxiliary air system and a gas distribution system, a decommissioned lithium battery negative plate enters the cavity through the feeding bin, protective gas enters the heating and auxiliary air system from the gas distribution system to be heated, then a binder on graphite powder is decomposed, the graphite powder is stripped by rotating and turning over the roller and pushing the plate material to turn over, and a large amount of first-grade graphite powder raised in the cooling bin can be separated and recycled through the analyzer. According to the device, a large amount of primary graphite powder raised in the pyrolysis cabin and the cooling cabin can be separated and recycled, high-quality graphite is recycled, the subsequent screening pressure is reduced, and meanwhile, the overall recycling efficiency of the negative electrode of the retired lithium ion battery and the treatment rate of a graphite powder stripping process are improved.

Description

Technical Field

[0001] The utility model belongs to the field of battery recycling and relates to a heat-assisted air type lithium battery negative electrode powder stripping, sorting and recycling device. Background Art

[0002] In recent years, new energy vehicles and energy storage have been vigorously developed and applied. Lithium batteries have been widely used due to their stable electrochemical properties and extremely high energy density. The amount of waste batteries has increased dramatically with the installation and use of lithium batteries. If waste batteries are not effectively recycled and harmlessly treated, it will cause great waste of resources and pollution.

[0003] At present, the development of mature battery recycling processes is mainly aimed at the recovery of high-value metals in positive electrode materials. For negative electrode materials, they are often incinerated as a whole or directly landfilled, which makes them difficult to recycle. The negative electrode materials of lithium-ion power batteries are mainly natural flake graphite and artificial layered graphite. Graphite has the advantages of abundant raw materials and low cost, and is considered to be the most promising negative electrode material for lithium-ion power batteries. However, copper foil is fragile and graphite powder is easy to generate dust. The two are easy to mix and difficult to effectively sort and recycle. At the same time, the binder in the battery manufacturing process makes it difficult to effectively peel off the graphite powder from the surface of the copper foil. This has always been a problem that needs to be further solved. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device, which can achieve efficient pyrolysis of waste lithium battery negative electrode binder and classified treatment of copper powder, copper sheet and graphite powder, thereby improving the battery negative electrode recycling efficiency and saving the recycling cost of waste lithium batteries.

[0005] The utility model is realized by the following technical solutions:

[0006] A heat-assisted air type lithium battery negative electrode powder stripping, sorting and recycling device, comprising a feed chamber, a pyrolysis chamber, a gas distribution chamber, an analyzer, a cooling chamber, a discharge hopper, a linear screen, a heating and auxiliary air system and a gas distribution system;

[0007] The pyrolysis chamber comprises a cavity, a drum and a heating and auxiliary air system are arranged in the cavity, a feed chamber is arranged above one side of the cavity, a gas distribution chamber is arranged at one end of the cavity, an analyzer is arranged at the other end of the cavity and is connected with the cavity and the cooling chamber respectively through the main air duct, and the entire cavity constitutes a semi-enclosed whole; the cooling chamber is arranged below the cavity, a discharge port is provided below the cavity, the material enters the cooling chamber through the discharge port, and the linear screen is connected with the cooling chamber through the discharge hopper; a material transmission system is arranged in the cooling chamber, and the gas distribution system is arranged on the gas distribution chamber;

[0008] The negative electrode sheets of retired lithium batteries enter the cavity through the feed cabin. The protective gas enters the heating and auxiliary air system from the air distribution system to decompose the binder on the graphite powder after heating. The graphite powder is peeled off by turning the drum and pushing the sheet to flip. The large amount of primary graphite powder raised by the recovery drum and the cooling cabin can be separated and recovered by the analyzer, and the copper sheets, copper powder and secondary graphite powder are screened out through the linear screen.

[0009] Furthermore, the feed cabin includes a feed cover plate, which is arranged on the top of the feed cabin, a feed valve is arranged at the lower end of the feed cover plate, a feed guide plate is obliquely arranged at the lower end of the feed valve and around the feed cabin, a quality monitor is arranged at the upper middle end of the feed guide plate, a screw conveyor is horizontally arranged at the lower end of the feed guide plate, and is used to transport the negative electrode sheet to the heating and auxiliary air system, and an air distribution plate is arranged on one side of the screw conveyor for transporting protective gas to the cavity.

[0010] Furthermore, the heating and auxiliary air system includes a cylindrical structure, the large end of the tapered feed port is connected to the end of the cylindrical structure away from the drum, and the small end is connected to the screw feeder in the feed chamber. The heating plate forms a cylindrical structure, and the hot air trough is arranged on the outer layer of the heating plate to provide hot air required for pyrolysis; the heating plate rotation trough is arranged between the heating plate and the hot air trough, which plays a role in supporting the heating plate and the hot air trough; the air induced plate is arranged on the outer wall of the hot air trough, the air valve is arranged in the middle of the hot air trough, and the hot air outlet is arranged at one end of the hot air trough.

[0011] Furthermore, the main air duct of the analyzer is arranged at the front end of the analyzer, the main air duct pressure relief valve is arranged at the upper end of the main air duct, and the first-level graphite powder discharge port is arranged at the lower end of the analyzer. The dust containing graphite powder is collected through the air distribution of the cavity and the exhaust of the analyzer and transported to the analyzer along the pipeline.

[0012] Furthermore, the cooling chamber includes a particle absorption chamber, which is arranged at the upper end of the cooling chamber, the particle absorption chamber is connected to the analyzer through the main air duct, the air distribution port is arranged at the middle end of the cooling chamber, the heat-resistant conveyor belt is arranged at the bottom layer of the cooling chamber, and the suction hopper is arranged above the heat-resistant conveyor belt.

[0013] Furthermore, the linear screen includes a primary screen, a secondary screen and an airflow separator, the primary screen is arranged on the upper layer of the linear screen, the secondary screen is arranged on the middle layer of the linear screen, the copper sheet discharge port is arranged at the end of the primary screen, the copper particle discharge port is arranged at the end of the secondary screen; the secondary graphite powder discharge port is arranged at the bottom layer of the linear screen.

[0014] Furthermore, the air distribution system includes an air inlet arranged on one side of the cavity, the air inlet is arranged at one end of the air distribution system, the air inlet is connected to an air duct arranged along the inner wall of the cavity through an air distribution pipe, the air duct valve is arranged in the air duct, and the air distribution pipe is provided with uniform openings.

[0015] Furthermore, the drum is provided with a drum slide groove which surrounds it, drum sprockets are arranged on both sides of the drum slide groove, drum rollers are arranged at the lower end of the drum and fit with the drum sprockets and the drum slide groove, a drum feed guide plate is arranged at the drum inlet end, and an auxiliary air feed port is arranged on one side of the drum feed guide plate.

[0016] Furthermore, a roller material guide chute with a certain angle and spiral direction is arranged on the inner wall of the roller, and a material guide baffle is arranged at the end of the roller material guide chute to block the completely reacted sheet material.

[0017] The utility model can heat the feed and auxiliary hot air of the retired lithium-ion battery graphite negative electrode without strong mechanical force damage, effectively decompose the binder on the graphite powder by synchronous heating and auxiliary air system, and can also peel off the graphite powder by rotating and flipping the roller and pushing the sheet material to flip after cooling with low-temperature air, and the graphite powder is further peeled off by the material properties of graphite and copper foil. During the operation of the equipment, a high flow of protective gas is introduced into the device through the air distribution system to create an oxygen-deficient environment, avoid oxidation and damage of graphite powder by oxygen, and ensure the high-performance structure of graphite. At the same time, the device is equipped with an optimized analyzer and air duct, which can separate and recover a large amount of primary graphite powder raised in the cooling chamber of the cooling chamber through the analyzer, which not only recovers high-quality graphite but also reduces the subsequent screening pressure, and screens out copper sheets, copper powder, and secondary graphite powder through a linear screen. At the same time, the overall recovery efficiency of retired lithium-ion battery negative electrodes and the process rate of peeling graphite powder are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front structural schematic diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the front internal planing structure of the utility model;

[0020] Figure 3 It is a side structural schematic diagram of the utility model;

[0021] Figure 4a This is a schematic diagram of the front view structure of the pyrolysis chamber in the utility model;

[0022] Figure 4b The side view of the pyrolysis chamber in the utility model is shown in FIG. Figure 1 ;

[0023] Figure 4c The side view of the pyrolysis chamber in the utility model is shown in FIG. Figure 2 ;

[0024] Figure 5a It is a side view structural diagram of the heating and auxiliary air system in the utility model;

[0025] FIG5 is a schematic diagram of the front view structure of the heating and auxiliary air system in the utility model;

[0026] Figure 6 This is a schematic diagram of the hot air trough structure in the utility model;

[0027] Description of reference numerals:

[0028] 1-feeding cabin; 2-air intake pipe;

[0029] 3-feeding rod; 4-chamber;

[0030] 5- cavity pressure relief valve; 6- cavity pressure relief air duct;

[0031] 7-Analyzer 8-Main air duct pressure relief valve;

[0032] 9-First-level graphite powder discharge port; 10-Output inspection port;

[0033] 11- particle absorption chamber; 12- cooling chamber;

[0034] 13- heat-resistant transmission belt; 14- support rod;

[0035] 15-discharging hopper; 16-linear screen;

[0036] 17-airflow separator; 18-copper sheet discharge port;

[0037] 19- copper particle discharge port; 20- secondary graphite powder discharge port;

[0038] 21- linear screen support frame; 22- electric motor;

[0039] 23- Heating and auxiliary air system; 24- Ground indicator line;

[0040] 25- linear screen distribution box; 26- heating system housing;

[0041] 27-drum; 28-main air duct;

[0042] 29-suction hopper; 30-air outlet;

[0043] 31-feeding plate; 32-high temperature unloading hopper;

[0044] 33- roller sprocket; 34- temperature detector;

[0045] 35- roller chute; 36- roller roller;

[0046] 37- drum feed guide plate; 38- auxiliary air feed port;

[0047] 39- material guide baffle; 40- roller material guide chute;

[0048] 41-feeding port; 42-heating plate;

[0049] 43-hot air outlet; 44-heating plate rotation slot;

[0050] 45-hot air slot; 46-air induction plate;

[0051] 47-air valve; 48-transmission system;

[0052] 49- output assembly; 50- air distribution system;

[0053] 51-feed cover plate; 52-feed valve;

[0054] 53-feed guide plate; 54-air distribution plate;

[0055] 55-secondary screen; 56-primary screen;

[0056] 57-display screen; 58-alarm;

[0057] 59-indicator light; 60-humidity monitor;

[0058] 61-flame monitor; 62-gas monitor;

[0059] 63-Quality monitor; 64-Draught valve

[0060] 65- air duct; 66- air distribution duct. DETAILED DESCRIPTION

[0061] The present invention will be further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0062] like Figure 1 As shown, an embodiment of the utility model provides a heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recovery device, including a pyrolysis chamber, a gas distribution chamber, a cavity 4, a feed chamber 1, a heating and auxiliary air system 23, a drum 27, an analyzer 7, a cooling chamber 12, a linear screen 16, a transmission system 48, an output component 49 and a gas distribution system 50.

[0063] The pyrolysis chamber includes a chamber 4, a drum 27 and a heating and auxiliary air system 23 are arranged in the chamber 4, a feed chamber 1 is arranged on the upper right side of the chamber 4; an air distribution chamber is arranged on the right side of the chamber 4; a heating and auxiliary air system 23 is arranged around the middle of the chamber 4; an analyzer 7 is arranged at the other end of the chamber 4 and is connected to the chamber 4 and the cooling chamber 12 through the main air duct 28 respectively; the cooling chamber 12 is arranged below the chamber 4, a material transmission system 48 is arranged in the cooling chamber 12, a discharge port is opened below the chamber 4, and the material enters the cooling chamber 12 through the discharge port. A linear screen 16 is arranged on the right side outside the chamber 4, an air flow separator 17 is arranged above the linear screen 16, and the linear screen 16 is connected to the cooling chamber 12 through a discharge hopper 15; a transmission system 48 is respectively arranged at the starting end, the terminal end and inside the chamber 4 for feeding and discharging; an output component 49 is arranged on the outer shell of the chamber 4; and an air distribution system 50 is arranged inside the air duct, the air distribution chamber and the inlet and outlet. The entire chamber 4 constitutes a semi-enclosed whole.

[0064] refer to Figure 1 , Figure 2 and Figure 3 As shown, the feed cabin 1 includes a feed cover plate 51, a feed valve 52, a feed guide plate 53, a screw conveyor 3, an air distribution plate 54, and a quality monitor 63. The feed cover plate 51 is arranged on the top of the feed cabin 1, and the feed valve 52 is arranged at the lower end of the feed cover plate 51, which automatically adjusts the opening size to adjust the feed amount. The feed guide plate 53 is arranged at the lower end of the feed valve 52 and around the feed cabin 1, with a certain angle to buffer the feed speed and evenly distribute the material. The quality monitor 63 adopts a mass flow meter and is arranged at the upper middle end of the feed guide plate 53 to record and monitor the feed amount. The screw conveyor 3 is arranged at the lower end of the feed guide plate 53 to transport the negative electrode sheet to the heating and auxiliary air system 23. The air distribution plate 54 is arranged on the right side of the screw conveyor 3 to transport gases such as argon, nitrogen, helium, neon, krypton, etc., which reduces the oxygen content and protects the electrode sheet from oxidation.

[0065] For example, reference Figure 2 , Figure 3 , Figure 5a and Figure 5b As shown, the heating and auxiliary air system 23 includes a feed port 41, a heating plate 42, a hot air port 43, a heating plate rotation groove 44, a hot air groove 45, an air induction plate 46, and an air valve 47. The heating and auxiliary air system 23 includes a cylindrical structure, the large end of the conical feed port 41 is connected to the end of the cylindrical structure away from the drum, and the small end is connected to the screw feeder 3 in the feed chamber 1. The heating plate 42 is surrounded by a cylindrical structure, and the feed port 41 is set at the rightmost end of the heating and auxiliary air system 23, connected to the screw feeder, and receives the pole piece material dropped by the screw feeder. The heating plate 42 is set in the innermost layer of the heating and auxiliary air system 23, providing heat and cooperating with the emitted hot air to pyrolyze the binder in the pole piece material. The hot air groove 45 is set in the outer layer of the heating plate 42 to provide the hot air required for pyrolysis.

[0066] The heating plate rotating groove 44 is arranged in the middle layer between the heating plate 42 and the hot air groove 45, the air induction plate 46 is arranged on the wall of the hot air groove 45, and the air valve 47 is arranged in the middle of the hot air groove 45 at the left and right ports. The hot air outlet 43 is arranged in the middle of the hot air groove 45 at the leftmost end; the heating plate rotating groove 44 plays the role of supporting the heating plate 42 and the hot air groove 45, and drives the hot air groove 45 to adjust the angle along the heating plate rotating groove 44. The air induction plate 46 has a certain height on the wall of the hot air groove 45, and controls the air flow to flow along the designed flow rate of the air induction plate. The air valve 47 adjusts the air volume and flow direction of the hot air by controlling the opening and closing size and direction.

[0067] For example, reference Figure 1 , Figure 2 , Figure 4a , Figure 4b and Figure 4c As shown, the roller 27 includes a roller chute 35, a roller sprocket 33, a high-temperature discharge hopper 32, a roller roller 36, a roller feed guide plate 37, an auxiliary air feed port 38, a material guide baffle 39, and a roller guide chute 40. The roller chute 35 is arranged on the left and right sides of the roller, the roller sprocket 33 is arranged on the left and right sides of the roller chute 35, and the roller roller 36 is arranged at the lower end of the roller 27. The roller roller 36 is in contact with the roller sprocket 33 and the roller chute 35 to rotate the roller 27. The roller feed guide plate 37 is arranged at the front end of the roller 27 to receive the heated pole sheet material at the front end and adjust the feeding speed. The auxiliary air feed port 38 is arranged at the right end of the roller feed guide plate 37 to cooperate with the hot air port 43 to blow away the pole sheet material.

[0068] The roller guide chute 40 is arranged on the inner wall of the roller 27, with a certain angle and spiral direction, which plays the role of turning and pushing the sheet materials. The material guide baffle 39 is arranged at the end of the roller guide chute 40 to block the fully reacted sheet materials and guide the discharge.

[0069] refer to Figure 1 , Figure 2 and Figure 3 As shown, the analyzer 7 includes a main air duct 28, a main air duct pressure relief valve 8, and a primary graphite powder discharge port 9. The main air duct 28 is arranged at the front end of the analyzer 7, and the dust containing graphite powder is collected and transported to the analyzer 7 along the pipeline through the air distribution of the cavity 4 and the exhaust of the analyzer 7. The main air duct pressure relief valve 8 is arranged at the upper end of the main air duct 28, and plays a role in timely pressure relief and pipeline protection when an extreme atmospheric pressure difference occurs. The primary graphite powder discharge port 9 is arranged at the lower end of the analyzer 7. The analyzer 7 uses the difference between the density of graphite powder particles and the density of gas to discharge the heavier primary graphite powder from the primary graphite powder discharge port 9.

[0070] refer to Figure 2 , Figure 3As shown, the cooling chamber 12 includes a particle absorption chamber 11, a heat-resistant conveyor belt 13, a suction hopper 29, and an air distribution port 30. The particle absorption chamber 11 is arranged at the upper end of the cooling chamber 12, the air distribution port 30 is arranged at the middle end of the cooling chamber 12, the heat-resistant conveyor belt 13 is arranged at the bottom layer of the cooling chamber 12, and the suction hopper 29 is arranged above the heat-resistant conveyor belt 13; the low-temperature wind provided by the air distribution port 30 and the exhaust air of the main air duct 28 drive the low-temperature wind to fill the cooling chamber 12, and at the same time, the low-temperature wind at an angle of the air distribution port 30 sweeps the negative electrode sheet on the heat-resistant conveyor belt 13, so that the negative electrode slag material is quickly cooled, and as the temperature drops, the graphite powder and the copper foil are further separated, and the fine graphite powder is absorbed by the suction hopper 29 to the analyzer 7 for separation.

[0071] refer to Figure 1 , Figure 2 and Figure 3 As shown, the discharge hopper 15 is arranged at the right end of the cooling chamber 12, guiding the hot negative electrode sheets remaining in the cooling chamber 12 into the linear screen 16. The linear screen 16 includes a primary screen 56, a secondary screen 55, an airflow separator 17, a linear screen support frame 21, a motor 22, a copper sheet discharge port 18, a copper particle discharge port 19, and a secondary graphite powder discharge port 20. The primary screen 56 is arranged on the upper layer of the linear screen 16; the secondary screen 55 is arranged on the middle layer of the linear screen 16; the motor 22 is arranged at both ends of the outer side of the linear screen 16; the copper sheet discharge port 18 is arranged at the end of the primary screen 56; the copper particle discharge port 19 is arranged at the end of the secondary screen 55; the secondary graphite powder discharge port 20 is arranged at the lowest layer of the linear screen 16, and the linear screen support frame 21 is arranged at the lower part of the linear screen 16. The motor 22 of the linear screen 16 drives the primary screen 56 and the secondary screen 55 to vibrate through reciprocating motion, driving the powder flake mixture to move from the front end of the screen to the end; copper flakes, copper powder, and secondary graphite powder are screened out through the different apertures of the primary screen 56 and the secondary screen 55.

[0072] refer to Figure 1 As shown, the output component 49 includes a display screen 57, an alarm 58 and an indicator light 59. The display screen 57, the alarm 58 and the indicator light 59 are all arranged on the outside of the cavity 4. The indicator light 59 includes three colors: red, green and yellow. The output component 49 is connected to the temperature monitor 34, the humidity monitor 60, the flame monitor 61, the gas monitor 62 and the quality monitor 63 in the cavity. During the feeding and pyrolysis process, if it is detected that there is abnormal gas in the cavity 4, the temperature inside the cavity 4 is too high or detonation occurs, the retired battery in the feed chamber 1 is too heavy, etc., the feed valve 52 stops feeding by self-locking through emergency braking.

[0073] refer to Figure 1 , Figure 2 and Figure 3As shown, the air distribution system 50 includes an air inlet 2, an air induction valve 63, an air induction slot 64, and an air distribution pipe 65. The air inlet 2 is arranged at the right end of the air distribution system 50, the air distribution pipe 65 is arranged at the right end of the air induction slot 64, the air induction valve 63 is arranged in the air induction slot 64, and the air distribution pipe 65 is provided with uniform openings to facilitate uniform air distribution. The protective gas used can be one or any combination of nitrogen, carbon dioxide, helium, argon, neon, krypton and xenon. The manufacturing material of the heat-assisted air type lithium battery negative electrode powder stripping and sorting recovery device can be one or more of 44 steel, 35 steel, A3 steel, 40Cr alloy structural steel, HT149 gray cast iron, 65Mn steel, 0Cr18Ni9 steel, DCCr12MoV chrome steel, SKD11 chrome steel, D2 steel, SKD11 (SLD) chrome steel.

[0074] The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device of the utility model works in the following principle:

[0075] First, open the distribution box and the power cabinet, and slide the retired lithium battery negative electrode sheet into the cavity 4 through the feed guide plate 53. When the quality monitor 63 detects that the rated feed volume has been reached in the cavity 4, the feed valve 52 reduces the feed by adjusting the opening and closing degree. When an abnormal situation occurs, the feed cover 51 is closed to stop feeding.

[0076] When the pyrolysis chamber is working, the negative electrode sheet entering the cavity 4 is transported to the pyrolysis chamber by a screw feeder, and a high flux of protective gas enters the heating and auxiliary air system 23 from the air inlet 2, and is evenly distributed through the air distribution pipe 65 to create a safe working environment.

[0077] When the roller is working, the roller drives the roller chain teeth 33 to rotate along the roller chute 35, and the negative electrode sheet flips along the roller guide chute 40. During the heating process, the graphite powder on the negative electrode sheet is peeled off from the copper foil and blown up along the roller guide chute 40 by the hot air gushing out of the hot air outlet 43, of which 30% to 40% of the negative electrode powder is blown to the analyzer 7 along the main air duct 28. At the same time, the low-temperature air released by the air outlet 30 outside the main air duct 28 further cools the hot negative electrode powder.

[0078] When the cooling chamber 12 is working, part of the de-powdered negative electrode powder is transported from the discharge port opened at the bottom of the cavity to the heat-resistant conveyor belt 13 at the lower end of the cooling chamber 12, and a large amount of low-temperature protective gas is blown into the air distribution ports 30 at both ends of the cooling chamber 12. The negative electrode powder is further peeled off due to the change in the cooling characteristics of the material itself, and the graphite powder becomes brittle and falls off and is rolled up by the low-temperature protective gas from the air distribution port 30, and is absorbed by the high-temperature suction hopper 29 on the cooling chamber 12 to the particle absorption chamber 11, of which 30% to 40% of the negative electrode powder is sucked from the particle absorption chamber 11 to the analyzer 7 along the main air duct 28. When the analyzer 7 is working, the main air duct 28 transports the gas containing negative electrode graphite powder to the upper end of the analyzer 7, and the dust-containing gas flows along the conical inner wall of the analyzer 7, and the negative electrode powder and gas are separated at the bottom of the analyzer 7 due to the double vortex motion. The negative electrode powder is discharged from the bottom of the analyzer 7 by centrifugation due to its higher density. The main air duct 28 controls the hot air and low-temperature air volume through the opening and closing size of the air valve 47, so that the two gases with different temperatures and dust contents are mixed, which plays a role in regulating the temperature and flow of the dust-containing gas in the pyrolysis chamber and the cooling chamber 12, thereby reducing the pressure of the analyzer 7 and discharging the material evenly. At the same time, the main air duct pressure relief valve 8 also protects the cavity 4.

[0079] When the linear screen 16 is working, the negative electrode powder is introduced into the linear screen 16 from the discharge hopper 15, and the motor 22 drives the primary screen 56 and the secondary screen 55 to vibrate through reciprocating motion, driving the powder flake mixture to move from the front end of the screen to the end, and the copper flakes, copper powder, and secondary graphite powder are screened out through the different apertures of the primary screen 56 and the secondary screen 55.

Claims

1. A heat-assisted air type lithium battery negative electrode powder stripping and sorting recovery device, characterized in that: It comprises a feed chamber (1), a pyrolysis chamber, a gas distribution chamber, an analyzer (7), a cooling chamber (12), a discharge hopper (15), a linear screen (16), a heating and auxiliary air system (23) and a gas distribution system (50); The pyrolysis chamber comprises a chamber (4), a roller (27) and a heating and auxiliary air system (23) are arranged in the chamber (4), a feed chamber (1) is arranged above one side of the chamber (4), an air distribution chamber is arranged at one end of the chamber (4), an analyzer (7) is arranged at the other end of the chamber (4) and is respectively connected to the chamber (4) and the cooling chamber (12) through a main air duct (28), and the entire chamber (4) forms a semi-enclosed whole; the cooling chamber (12) is arranged below the chamber (4), a discharge port is provided below the chamber (4), and the material enters the cooling chamber (12) through the discharge port, and the linear screen (16) is connected to the cooling chamber (12) through a discharge hopper (15); a material transmission system (48) is arranged in the cooling chamber (12), and an air distribution system (50) is arranged on the air distribution chamber; Negative plates of retired lithium batteries enter the cavity (4) through the feed cabin (1), and protective gas enters the heating and auxiliary air system (23) from the air distribution system (50) to decompose the binder on the graphite powder after heating. The graphite powder is peeled off by rotating the roller and pushing the sheet material to flip. The large amount of primary graphite powder raised by the cooling chamber of the roller and the cooling chamber (12) can be separated and recovered by the analyzer (7), and the copper sheet, copper powder and secondary graphite powder are screened out by the linear screen (16).

2. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 1 is characterized in that: The feed cabin (1) comprises a feed cover plate (51), the feed cover plate (51) is arranged on the top of the feed cabin (1), a feed valve (52) is arranged at the lower end of the feed cover plate (51), a feed guide plate (53) is arranged obliquely at the lower end of the feed valve (52) and around the feed cabin (1), a quality monitor (63) is arranged at the upper middle end of the feed guide plate (53), a screw conveyor (3) is arranged horizontally at the lower end of the feed guide plate (53) and is used to convey the negative electrode sheet to the heating and auxiliary air system (23), and an air distribution plate (54) is arranged on one side of the screw conveyor (3) and is used to convey protective gas to the cavity (4).

3. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 2 is characterized in that: The heating and auxiliary air system (23) comprises a cylindrical structure, a tapered feed port (41) with a large end connected to the end of the cylindrical structure away from the drum, and a small end connected to the screw feeder (3) in the feed chamber (1); a heating plate (42) forms a cylindrical structure, a hot air groove (45) is arranged on the outer layer of the heating plate (42) to provide hot air required for pyrolysis; a heating plate rotation groove (44) is arranged between the heating plate (42) and the hot air groove (45), and plays a role in supporting the heating plate (42) and the hot air groove (45); an air induction plate (46) is arranged on the outer wall of the hot air groove (45), an air valve (47) is arranged in the middle of the hot air groove (45), and a hot air port (43) is arranged at one end of the hot air groove (45).

4. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 2 is characterized in that: The main air duct (28) of the analyzer (7) is arranged at the front end of the analyzer (7), the main air duct pressure relief valve (8) is arranged at the upper end of the main air duct (28), and the first-level graphite powder discharge port (9) is arranged at the lower end of the analyzer (7). The dust containing graphite powder is collected through the air distribution of the cavity (4) and the exhaust of the analyzer (7) and transported to the analyzer (7) along the pipeline.

5. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 2 is characterized in that: The cooling chamber (12) comprises a particle absorption chamber (11), the particle absorption chamber (11) is arranged at the upper end of the cooling chamber (12), the particle absorption chamber (11) is connected to the analyzer (7) through a main air duct (28), the air distribution port (30) is arranged at the middle end of the cooling chamber (12), the heat-resistant conveyor belt (13) is arranged at the bottom layer of the cooling chamber (12), and the suction hopper (29) is arranged above the heat-resistant conveyor belt (13).

6. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 2 is characterized in that: The linear screen (16) comprises a primary screen (56), a secondary screen (55) and an airflow separator (17); the primary screen (56) is arranged at the upper layer of the linear screen (16); the secondary screen (55) is arranged at the middle layer of the linear screen (16); a copper sheet discharge port (18) is arranged at the end of the primary screen (56); a copper particle discharge port (19) is arranged at the end of the secondary screen (55); and a secondary graphite powder discharge port (20) is arranged at the bottom layer of the linear screen (16).

7. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 2 is characterized in that: The air distribution system (50) comprises an air inlet (2) arranged on one side of the cavity (4); the air inlet (2) is arranged at one end of the air distribution system (50); the air inlet (2) is connected to an air induction groove arranged along the inner wall of the cavity through an air distribution pipe (65); an air induction valve is arranged in the air induction groove (64); and the air distribution pipe (65) is provided with uniform openings.

8. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 1 is characterized in that: The drum (27) is provided with a drum slide groove (35) which surrounds the drum, drum chain teeth (33) are arranged on both sides of the drum slide groove (35), a drum roller (36) is arranged at the lower end of the drum (27) and is in contact with the drum chain teeth (33) and the drum slide groove (35), a drum feed guide plate (37) is arranged at the inlet end of the drum (27), and an auxiliary air feed port (38) is arranged on one side of the drum feed guide plate (37).

9. The heat-assisted air-type lithium battery negative electrode powder stripping, sorting and recycling device according to claim 1, characterized in that: A spiral roller material guide chute (40) is arranged on the inner wall of the roller (27), and a material guide baffle (39) is arranged at the end of the roller material guide chute (40) to block the completely reacted flakes.

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