A lithium battery nmp recycling device

Abstract

This utility model relates to the technical field of auxiliary equipment for lithium battery production, and discloses a lithium battery NMP recycling device, including a tank assembly, a top cover assembly on the top of the tank assembly, a mounting base fixed on the side wall of the tank assembly, a steam heater installed on the side wall of the tank assembly, and an exhaust gas NMP adsorption assembly inside the tank assembly. This utility model achieves quick disassembly and assembly of the sealing cover by engaging the locking blocks of the exhaust gas NMP adsorption assembly with the locking grooves of the stainless steel tank. Subsequent maintenance or replacement of the NMP adsorption filter plates does not require disassembling numerous connecting parts, making operation convenient. Simultaneously, the air guide holes of the air guide pipe face the inner side wall of the sealing cover and are evenly spaced, allowing the NMP-containing exhaust gas to disperse evenly within the sealing cover, fully contacting the NMP adsorption filter plates and effectively improving NMP adsorption efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for lithium battery production, specifically a lithium battery NMP recycling device. Background Technology

[0002] In lithium battery production, N-methylpyrrolidone (NMP) is widely used as a solvent in electrode preparation, and its recycling equipment is crucial for achieving resource recycling and environmental compliance. However, existing lithium battery NMP recycling equipment still faces the following problems:

[0003] Most recycling equipment uses fixed welding or multi-bolt connection for the exhaust gas NMP adsorption components. When replacing the adsorption filter plate or maintaining the components, a large number of connecting parts need to be disassembled, which is cumbersome and time-consuming. At the same time, after the exhaust gas is introduced, local accumulation is likely to occur, which cannot evenly contact the adsorption components, resulting in low NMP adsorption efficiency.

[0004] The sealing structure design of some equipment is not perfect. For example, the parts where the gas pipe passes through the stainless steel tank and the connection parts between the steam heater and the side channel are prone to leakage of NMP exhaust gas or high-temperature steam after long-term use. This not only wastes resources but also poses safety hazards. In addition, the equipment installation structure is not stable enough and is prone to displacement due to vibration during operation, which affects the continuity of the recycling process. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a lithium battery NMP recycling device. By incorporating a quickly detachable NMP adsorption component for waste gas, a multi-part sealing structure, and a stable mounting base, it solves the problems of inconvenient maintenance of the adsorption component, uneven waste gas adsorption, poor sealing performance, and insufficient installation stability in existing devices.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery NMP recycling device, comprising a tank assembly, a top cover assembly disposed on the top of the tank assembly, a mounting base fixedly disposed on the side wall of the tank assembly, a steam heater installed on the side wall of the tank assembly, and an exhaust gas NMP adsorption assembly disposed in the inner cavity of the tank assembly.

[0009] The tank assembly includes a stainless steel tank made of 304 stainless steel, which is resistant to high temperatures and corrosion, making it suitable for the high-temperature environment of the NMP recycling process. Four equal-angled side slots are formed on the lower outer wall of the stainless steel tank for precise installation of a steam heater, ensuring symmetrical heater positioning. Four equal-angled slots are formed on the bottom inner wall of the stainless steel tank, providing a positioning base for the NMP adsorption assembly. A slot is formed at the center of the bottom of the stainless steel tank, and a gas guide pipe is fixedly inserted within the slot. The centrally located gas guide pipe allows the waste gas to circulate outwards. Uniform diffusion; the sidewall of the gas guide pipe has several gas guide holes, which are channels for waste gas to enter the sealing cover; an inlet valve is installed at the end of the gas guide pipe away from the stainless steel tank, and the inlet valve is connected to the gas guide pipe and is used to control the introduction of NMP-containing waste gas; six first through holes are opened at equal angles on the outer periphery of the bottom wall of the stainless steel tank, and the first through holes provide channels for the discharge of NMP after desorption; a control valve is fixedly installed on the bottom wall of the stainless steel tank and located at the first through holes, and the control valve is connected to the inner cavity of the stainless steel tank and is used to control the discharge of NMP after desorption.

[0010] The top cover assembly includes a top cover plate, which covers the top of the stainless steel tank. The top cover plate can be quickly disassembled to facilitate the maintenance of the internal components of the tank. A second through hole is provided at the center of the top cover plate, and an exhaust valve is fixedly installed in the second through hole. The exhaust valve is connected to the internal cavity of the stainless steel tank and is used to discharge the clean gas after adsorption.

[0011] The steam heater is fixedly connected in the side channel. The steam heater provides high temperature conditions for NMP desorption and meets the temperature requirements for NMP thermal separation.

[0012] The waste gas NMP adsorption assembly includes a sealing cover, which is fitted over the outside of the gas guide pipe, with the gas guide hole located inside the sealing cover. The sealing cover allows the waste gas to diffuse internally in a concentrated manner, avoiding direct contact with the inner wall of the tank. Four locking blocks are fixed at equal angles around the bottom opening of the sealing cover. The locking blocks engage with the locking slots, and the engagement structure between the locking blocks and the locking slots allows for quick assembly and disassembly of the sealing cover, reducing maintenance difficulty. The sealing cover has an opening on its side, and an NMP adsorption filter plate is fixed inside the opening. The NMP adsorption filter plate is made of molecular sieve material, which can efficiently adsorb NMP molecules in the waste gas.

[0013] As a further improvement of this utility model: the air guide holes on the air guide pipe are evenly spaced, with a spacing of 2-3 cm, and the opening direction of the air guide holes faces the inner wall of the sealing cover, so that the exhaust gas can flow evenly along the inner wall of the sealing cover and fully contact the NMP adsorption filter plate.

[0014] As a further improvement of this utility model: the exhaust gas NMP adsorption assembly has multiple NMP adsorption filter plates, and the multiple NMP adsorption filter plates are arranged at equal angles along the circumference of the sealing cover. The NMP adsorption filter plates are connected to the sealing cover by bolts. The bolt connection facilitates the individual replacement of the filter plates after wear, reducing maintenance costs.

[0015] As a further improvement of this utility model: the bottom of the mounting base is provided with a mounting hole, which is an M12 threaded hole and is compatible with common fixing bolts; there are two mounting bases, which are fixedly welded to the upper ends of the side wall of the stainless steel tank. The welding connection has high strength and can stably fix the equipment to the mounting surface, avoiding shaking during operation.

[0016] As a further improvement of this utility model: the heating end of the steam heater extends into the inner cavity of the stainless steel tank, with an extension length of 5-8cm, to ensure that high-temperature steam can evenly cover the periphery of the sealing cover; a sealing gasket is provided at the connection between the steam heater and the side channel, and the sealing gasket is made of oil-resistant rubber material to prevent high-temperature steam from leaking from the connection gap.

[0017] As a further improvement of this utility model: the sealing cover of the waste gas NMP adsorption component is made of stainless steel, and the inner wall of the sealing cover is coated with a high-temperature resistant and anti-corrosion coating with a thickness of 0.1-0.2mm, which can prevent NMP waste gas from corroding the sealing cover; the connection between the sealing cover and the clamping block is integrally formed, and the integrally formed structure has no connection gaps, which improves the overall strength and sealing performance of the sealing cover.

[0018] As a further improvement of this utility model: the gas guide pipe of the tank assembly is made of seamless steel pipe, which has no welding gaps and can prevent exhaust gas from leaking from the gaps in the pipe wall; and the part where the gas guide pipe passes through the bottom of the stainless steel tank is equipped with a leak-proof sealing ring, which is made of fluororubber and is compatible with the chemical properties of NMP solvent, further improving the sealing performance.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. In this utility model, the locking block of the waste gas NMP adsorption component and the locking groove of the stainless steel tank can be locked together to achieve quick disassembly and assembly of the sealing cover. When maintaining or replacing the NMP adsorption filter plate, there is no need to disassemble a large number of connecting parts, making the operation convenient. At the same time, the air guide holes of the air guide pipe face the inner wall of the sealing cover and are evenly distributed, so that the NMP-containing waste gas is evenly dispersed in the sealing cover and fully contacts the NMP adsorption filter plate, effectively improving the NMP adsorption efficiency.

[0021] 2. In this utility model, the gas guide pipe is provided with a leak-proof sealing ring at the part where it passes through the bottom of the stainless steel tank, and a sealing gasket is provided at the connection part between the steam heater and the side through groove. The double sealing structure can prevent the leakage of NMP exhaust gas or high-temperature steam, reduce resource waste and safety hazards; at the same time, the two mounting seats are welded and fixed to the side wall of the stainless steel tank, and the bottom is provided with threaded mounting holes, which can stably fix the equipment on the mounting surface, prevent the equipment from being displaced due to vibration during operation, and ensure the stable and continuous recycling process. Attached Figure Description

[0022] Figure 1 This is a perspective view of the entire utility model;

[0023] Figure 2 This is a partial sectional perspective view of the present invention.

[0024] Figure 3 This is a partial sectional perspective view of the main body of this utility model;

[0025] Figure 4 This is a three-dimensional view of the waste gas NMP adsorption component of this utility model.

[0026] In the diagram: 1. Tank assembly; 2. Top cover assembly; 3. Mounting base; 4. Steam heater; 5. Exhaust gas NMP adsorption assembly; 11. Stainless steel tank; 12. Side through groove; 13. First through hole; 14. Air guide pipe; 15. Slot; 16. Air guide hole; 17. Inlet valve; 18. Control valve; 21. Top cover plate; 22. Second through hole; 23. Outlet valve; 51. Sealing cover; 52. Locking block; 53. NMP adsorption filter plate. Detailed Implementation

[0027] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.

[0028] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see Figures 1-4 In this embodiment of the present invention, a lithium battery NMP recycling device includes a tank assembly 1, a top cover assembly 2 is disposed on the top of the tank assembly 1, a mounting base 3 is fixedly disposed on the side wall of the tank assembly 1, a steam heater 4 is installed on the side wall of the tank assembly 1, and a waste gas NMP adsorption assembly 5 is disposed in the inner cavity of the tank assembly 1.

[0031] The tank assembly 1 includes a stainless steel tank 11, which is made of 304 stainless steel and has high temperature resistance and corrosion resistance, making it suitable for the high temperature environment in the NMP recycling process. The lower outer wall of the stainless steel tank 11 has four side through grooves 12 at equal angles. The side through grooves 12 are used for precise installation of the steam heater 4 to ensure that the heater is symmetrically positioned. The inner bottom wall of the stainless steel tank 11 has four slots 15 at equal angles. The slots 15 provide a positioning and installation base for the waste gas NMP adsorption assembly 5. The bottom center of the stainless steel tank 11 has a groove, and a gas guide pipe 14 is fixedly inserted into the groove. The gas guide pipe 14 is located in the center so that the waste gas can be evenly diffused in all directions. The side wall of the gas duct 14 has several gas duct holes 16, which are channels for the exhaust gas to enter the sealing cover 51. An air inlet valve 17 is installed at the end of the gas duct 14 away from the stainless steel tank 11. The air inlet valve 17 is connected to the gas duct 14 and is used to control the introduction of NMP-containing exhaust gas. Six first through holes 13 are opened at equal angles on the outer periphery of the inner bottom wall of the stainless steel tank 11. The first through holes 13 provide channels for the discharge of NMP after desorption. A control valve 18 is fixedly installed on the outer bottom wall of the stainless steel tank 11 at the first through holes 13. The control valve 18 is connected to the inner cavity of the stainless steel tank 11 and is used to control the discharge of NMP after desorption.

[0032] The top cover assembly 2 includes a top cover plate 21, which covers the top of the stainless steel tank 11. The top cover plate 21 can be quickly disassembled to facilitate the maintenance of the internal components of the tank. A second through hole 22 is provided at the center of the top cover plate 21. An exhaust valve 23 is fixedly installed in the second through hole 22. The exhaust valve 23 communicates with the internal cavity of the stainless steel tank 11 and is used to discharge the clean gas after adsorption.

[0033] The steam heater 4 is fixedly connected in the side through groove 12. The steam heater 4 provides high temperature conditions for NMP desorption and meets the temperature requirements for NMP thermal separation.

[0034] The exhaust gas NMP adsorption assembly 5 includes a sealing cover 51, which is fitted outside the air guide pipe 14, and the air guide hole 16 is located inside the sealing cover 51. The sealing cover 51 allows the exhaust gas to be concentrated and diffused inside, avoiding direct contact with the inner wall of the tank. Four locking blocks 52 are fixed at equal angles around the bottom opening of the sealing cover 51. The locking blocks 52 engage with the locking groove 15. The locking structure between the locking blocks 52 and the locking groove 15 enables quick disassembly and assembly of the sealing cover 51, reducing maintenance difficulty. The sealing cover 51 has an opening on its side, and an NMP adsorption filter plate 53 is fixed inside the opening. The NMP adsorption filter plate 53 is made of molecular sieve material, which can efficiently adsorb NMP molecules in the exhaust gas.

[0035] The air guide holes 16 on the air guide pipe 14 are evenly spaced, with a spacing of 2-3 cm. The opening direction of the air guide holes 16 faces the inner wall of the sealing cover 51, which allows the exhaust gas to flow evenly along the inner wall of the sealing cover 51 and fully contact the NMP adsorption filter plate 53.

[0036] The exhaust gas NMP adsorption assembly 5 has multiple NMP adsorption filter plates 53, and the multiple NMP adsorption filter plates 53 are arranged at equal angles along the circumference of the sealing cover 51. The NMP adsorption filter plates 53 are connected to the sealing cover 51 by bolts. The bolt connection facilitates the individual replacement of the filter plates after wear, reducing maintenance costs.

[0037] The bottom of the mounting base 3 has a mounting hole, which is an M12 threaded hole and is compatible with common fixing bolts. There are two mounting bases 3, which are fixedly welded to the upper ends of the side wall of the stainless steel tank body 11. The welding connection has high strength and can stably fix the equipment to the mounting surface, avoiding shaking during operation.

[0038] The heating end of the steam heater 4 extends into the inner cavity of the stainless steel tank 11, with an extension length of 5-8cm, to ensure that high-temperature steam can evenly cover the periphery of the sealing cover 51; a sealing gasket is provided at the connection between the steam heater 4 and the side through groove 12. The sealing gasket is made of oil-resistant rubber material to prevent high-temperature steam from leaking from the connection gap.

[0039] The sealing cover 51 of the exhaust gas NMP adsorption component 5 is made of stainless steel, and the inner wall of the sealing cover 51 is coated with a high temperature resistant and anti-corrosion coating with a thickness of 0.1-0.2mm, which can prevent NMP exhaust gas from corroding the sealing cover 51. The sealing cover 51 and the clamping block 52 are connected by integral molding, and the integral molding structure has no connection gap, which improves the overall strength and sealing performance of the sealing cover 51.

[0040] The gas guide pipe 14 of the tank assembly 1 is made of seamless steel pipe. Seamless steel pipe has no welding gaps, which can prevent exhaust gas from leaking from the gaps in the pipe wall. In addition, the part where the gas guide pipe 14 passes through the bottom of the stainless steel tank 11 is equipped with a leak-proof sealing ring. The sealing ring is made of fluororubber, which is compatible with the chemical properties of NMP solvent, further improving the sealing performance.

[0041] The working principle of this utility model is as follows:

[0042] Normal adsorption state: Close all control valves 18, open the inlet valve 17 and the outlet valve 23; the waste gas containing NMP enters the air guide pipe 14 through the inlet valve 17, and disperses to the inner wall of the sealing cover 51 through the air guide holes 16 evenly distributed on the side wall of the air guide pipe 14; during the flow of the waste gas in the sealing cover 51, the NMP molecules contained therein are efficiently adsorbed by the NMP adsorption filter plate 53 on the side of the sealing cover 51; the clean gas after adsorption is discharged through the outlet valve 23 of the top cover assembly 2.

[0043] NMP recovery status: Close the outlet valve 23, open all control valves 18, and simultaneously start the four steam heaters 4; the high-temperature steam generated by the steam heaters 4 enters the inner cavity of the stainless steel tank 11 and heats the NMP adsorption filter plate 53 that adsorbs NMP, causing NMP molecules to desorb from the filter plate; the desorbed NMP vapor accumulates inside the tank, and then enters the control valve 18 through the first through hole 13 in the bottom wall of the stainless steel tank 11, and is finally discharged through the control valve 18 in conjunction with the inlet valve 17, thus realizing the recovery of NMP.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lithium battery NMP recycling device, comprising a tank assembly (1), a top cover assembly (2) disposed on the top of the tank assembly (1), a mounting base (3) fixedly disposed on the side wall of the tank assembly (1), a steam heater (4) installed on the side wall of the tank assembly (1), and a waste gas NMP adsorption assembly (5) disposed in the inner cavity of the tank assembly (1), characterized in that: The tank assembly (1) includes a stainless steel tank (11). The outer side wall of the stainless steel tank (11) has four side through grooves (12) at equal angles below it. The inner bottom wall of the stainless steel tank (11) has four slots (15) at equal angles. The bottom center of the stainless steel tank (11) has a slot, and a gas guide pipe (14) is fixedly inserted in the slot. The side wall of the gas guide pipe (14) has several gas guide holes (16). An air inlet valve (17) is installed at the end of the gas guide pipe (14) away from the stainless steel tank (11). The air inlet valve (17) is connected to the gas guide pipe (14). The outer periphery of the inner bottom wall of the stainless steel tank (11) has six first through holes (13) at equal angles. A control valve (18) is fixedly installed on the outer bottom wall of the stainless steel tank (11) at the first through holes (13). The control valve (18) is connected to the inner cavity of the stainless steel tank (11). The top cover assembly (2) includes a top cover plate (21), which covers the top of the stainless steel tank (11). A second through hole (22) is provided at the center of the top cover plate (21), and an exhaust valve (23) is fixedly installed in the second through hole (22). The exhaust valve (23) is connected to the inner cavity of the stainless steel tank (11). The steam heater (4) is fixedly connected in the side through groove (12); The waste gas NMP adsorption assembly (5) includes a sealing cover (51), which is sleeved on the outside of the air guide pipe (14), and the air guide hole (16) is located inside the sealing cover (51). Four locking blocks (52) are fixed at equal angles around the bottom opening of the sealing cover (51). The locking blocks (52) are engaged with the locking groove (15). The sealing cover (51) has a hole on its side, and an NMP adsorption filter plate (53) is fixed inside the hole.

2. The lithium battery NMP recycling equipment according to claim 1, characterized in that: The air guide pipe (14) has several air guide holes (16) that are evenly spaced, and the opening direction of the air guide holes (16) is towards the inner wall of the sealing cover (51).

3. The lithium battery NMP recycling equipment according to claim 1, characterized in that: The exhaust gas NMP adsorption assembly (5) has multiple NMP adsorption filter plates (53), and the multiple NMP adsorption filter plates (53) are arranged at equal angles along the circumference of the sealing cover (51). The NMP adsorption filter plates (53) are connected to the sealing cover (51) by bolt fixing.

4. The lithium battery NMP recycling equipment according to claim 1, characterized in that: The mounting base (3) has a mounting hole at the bottom. There are two mounting bases (3) and they are fixedly welded to the upper two ends of the side wall of the stainless steel tank (11).

5. The lithium battery NMP recycling equipment according to claim 1, characterized in that: The heating end of the steam heater (4) extends into the inner cavity of the stainless steel tank (11), and a sealing gasket is provided at the connection between the steam heater (4) and the side through groove (12).

6. The lithium battery NMP recycling equipment according to claim 1, characterized in that: The sealing cover (51) of the exhaust gas NMP adsorption component (5) is made of stainless steel, and the inner wall of the sealing cover (51) is coated with a high temperature resistant and anti-corrosion coating. The sealing cover (51) and the card block (52) are connected by integral molding.

7. The lithium battery NMP recycling equipment according to claim 1, characterized in that: The gas duct (14) of the tank assembly (1) is made of seamless steel pipe, and the gas duct (14) is provided with a leak-proof sealing ring at the point where it passes through the bottom of the stainless steel tank (11).

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