Device for recovering NMP (N-Methyl Pyrrolidone) solvent in high-vacuum state of lithium battery high-vacuum oven

Abstract

The high-vacuum state NMP solvent recycling device comprises a recycling machine body, a feeding opening is fixedly formed in one end of the recycling machine body, a discharging opening is fixedly formed in the side, opposite to the feeding opening, of one end of the recycling machine body, and an exhaust pipe is fixedly installed at the top end of the recycling machine body; one end of the recycling machine body is provided with a filtering cabinet for filtering NMP solvent impurities, the feeding port is connected with one end of the filtering cabinet in a penetrating mode, fixed clamping seats are fixedly installed in the filtering cabinet and symmetrically fixed to the two ends of the interior of the filtering cabinet, and the middles of the two fixed clamping seats are slidably connected with filtering plates for filtering the impurities; according to the NMP solvent recovery device, solid impurities in a solvent can be filtered through the filter plate in the filter cabinet when the NMP solvent is recovered, the situation that the solid impurities enter the recovery machine body to cause blockage of the feeding port is reduced, and the purity of the NMP solvent during recovery is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of NMP solvent recovery, and specifically to a device for recovering NMP solvent in a high-vacuum state of a high-vacuum oven for lithium batteries. Background Art

[0002] N-methylpyrrolidone, 1-methyl-2-pyrrolidone, abbreviated as NMP, has the advantages of high flash point, good safety, and good dissolution and dilution performance for the binder PDVF, and is commonly used in lithium-ion batteries. It is the main component of the exhaust gas discharged during the production of lithium-ion batteries, with a content of 0.06% - 0.5%. In Germany, N-methylpyrrolidone is designated as a third-class hazardous substance, and the German Environmental Protection Agency stipulates that its emission concentration is 100 * 10-6.

[0003] According to a novel NMP solvent recovery machine disclosed in the publication number CN205109332U, which includes an air inlet, a water layer, a gas-liquid separator, a liquid distributor, a recovery machine body, an exhaust port, an NMP on-line concentration detector, and a CPU. The bottom of the recovery machine body is provided with a water layer, one side of the water layer is provided with an air inlet, a gas-liquid separator is arranged above the water layer, a liquid distributor is installed above the gas-liquid separator, exhaust ports are arranged around the upper end of the recovery machine body, an NMP on-line concentration detector is installed at the bottom inside the recovery machine body, a pressure detector is installed at the top inside the recovery machine body, the output ends of the NMP on-line concentration detector and the pressure detector are electrically connected to the input end of the CPU, and the output end of the CPU is respectively electrically connected to the input ends of a touch operation screen and an alarm. The present invention not only has a high recovery efficiency, with a recovery rate of over 95%, but also occupies a small space, has a long service life, low cost, and is convenient for maintenance.

[0004] The above device can absorb the exhaust gas in NMP by arranging a gas-liquid separation layer and a liquid separation layer inside the recovery machine, improving the recovery efficiency of NMP. Since NMP may be mixed with dust in the air and metal particles generated by equipment wear during use, directly recovering it will reduce the purity of NMP solvent recovery and cannot meet the process requirements with higher purity requirements. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for recovering NMP solvent in a high-vacuum state of a high-vacuum oven for lithium batteries to solve the problem that the above device can absorb the exhaust gas in NMP by arranging a gas-liquid separation layer and a liquid separation layer inside the recovery machine, improving the recovery efficiency of NMP. Since NMP may be mixed with dust in the air and metal particles generated by equipment wear during use, directly recovering it will reduce the purity of NMP solvent recovery and cannot meet the process requirements with higher purity requirements.

[0006] To achieve the above object, the present invention provides the following technical solution: A device for recovering NMP solvent in a high-vacuum state of a lithium battery high-vacuum oven, including a recovery body, one end of the recovery body is fixedly installed with a feed port, and one side of the recovery body opposite to the feed port is fixedly installed with a discharge port. The top end of the recovery body is fixedly installed with an exhaust pipe. One end of the recovery body is provided with a filter cabinet for filtering impurities of NMP solvent. The feed port is connected to one end of the filter cabinet in a through manner. Inside the filter cabinet, a fixed clamping seat is fixedly installed, and the fixed clamping seats are symmetrically fixed at both ends inside the filter cabinet. A filter plate for filtering impurities is slidably connected in the middle of the two groups of fixed clamping seats. The top end of the filter cabinet is fixedly installed with a feed pipe for injecting NMP solvent.

[0007] As a further scheme of the present invention: A sliding rod is slidably connected inside the filter cabinet and above the filter plate. And symmetrically fixed in the middle of the two groups of sliding rods is a cleaning brush for cleaning impurities at the top end of the filter plate. Guide grooves for the sliding rods to slide are symmetrically opened inside the filter cabinet.

[0008] As a further scheme of the present invention: A cavity is opened inside the filter cabinet. One end of the sliding rod passes through the filter cabinet and is fixedly installed with a connecting block inside the cavity. An installation seat for the connecting block to slide is fixedly installed inside the cavity. A rotating motor is fixedly installed at the top end of the installation seat, and a driving arm is rotatably connected to one end of the rotating motor. One end of the connecting block is rotatably connected to a connecting arm rotatably connected to the driving arm.

[0009] As a further scheme of the present invention: A fixed block is fixedly installed at one end of the rotating motor and above the installation seat, and a guide rod penetrating through the connecting block is fixedly installed at one end of the fixed block.

[0010] As a further scheme of the present invention: A clamping slide rod slidably clamped with the fixed clamping seat is fixedly installed at one end of the filter plate, and the clamping slide rods are symmetrically fixed at both ends of the filter plate.

[0011] As a further scheme of the present invention: Collection grooves for precipitating and collecting impurities are symmetrically opened at the top end of the filter plate.

[0012] As a further scheme of the present invention: A cabinet door is rotatably connected to one end of the filter cabinet, and a handle is fixedly installed at one end of the cabinet door.

[0013] As a further scheme of the present invention: A touch operation screen is fixedly installed at one end of the recovery body, and an alarm is fixedly installed at one end of the touch operation screen.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] In the present invention, the filter plate inside the filter cabinet can filter out the solid impurities in the solvent when recovering the NMP solvent, reducing the blockage of the feed inlet caused by the solid impurities entering the interior of the recovery body, and increasing the purity of the NMP solvent during recovery.

[0016] In the present invention, the reciprocating movement of the cleaning brush can clean the impurities on the surface of the filter plate, reducing the accumulation of impurities on the surface of the filter plate. At the same time, the cleaning brush can sweep the solid particle impurities into the collection grooves at both ends of the filter plate for collection, facilitating the later staff to open the cabinet door for centralized treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the present invention;

[0018] Figure 2 is the side structural schematic diagram of the recovery body in the present invention;

[0019] Figure 3 is the open structural schematic diagram of the cabinet door and the filter cabinet in the present invention;

[0020] Figure 4 is the sectional structural schematic diagram of the filter cabinet in the present invention;

[0021] Figure 5 is the present invention Figure 4 partial enlarged structural schematic diagram of part A in;

[0022] Figure 6 is the sectional structural schematic diagram of the cavity in the present invention.

[0023] In the figure: 1, recovery body; 2, filter cabinet; 3, feed inlet; 4, feed pipe; 5, fixed card seat; 6, filter plate; 7, clamping slide bar; 8, sliding bar; 9, cleaning brush; 10, guide groove; 11, collection groove; 12, cavity; 13, mounting seat; 14, rotating motor; 15, fixed block; 16, connecting block; 17, guide rod; 18, driving arm; 19, connecting arm; 20, cabinet door; 21, handle; 22, exhaust pipe; 23, discharge port; 24, touch operation screen; 25, alarm. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes the embodiments according to the overall structure of the present invention.

[0026] Referring to Figures 1 to 6 , in an embodiment of the present invention, a device for recovering NMP solvent in a high-vacuum state of a lithium battery high-vacuum oven includes a recovery body 1. One end of the recovery body 1 is fixedly installed with a feed inlet 3, and on the side of the recovery body 1 opposite to the feed inlet 3 at one end is fixedly installed with a discharge outlet 23. The top of the recovery body 1 is fixedly installed with an exhaust pipe 22. One end of the recovery body 1 is provided with a filter cabinet 2 for filtering impurities of NMP solvent. The feed inlet 3 is connected to one end of the filter cabinet 2 in a through manner. Inside the filter cabinet 2 is fixedly installed with a fixed seat 5, and the fixed seat 5 is symmetrically fixed at both ends inside the filter cabinet 2. A filter plate 6 for filtering impurities is slidably connected in the middle of the two groups of fixed seats 5. The top of the filter cabinet 2 is fixedly installed with a feed pipe 4 for injecting NMP solvent. One end of the filter cabinet 2 is rotatably connected with a cabinet door 20, and a handle 21 is fixedly installed at one end of the cabinet door 20.

[0027] Adopting the above scheme: Sealing gaskets are provided at the edges of the feed inlet 3 and the discharge outlet 23 to prevent solvent leakage. The surface of the fixed seat 5 inside the filter cabinet 2 is finely polished to ensure smooth sliding of the filter plate 6. The filter plate 6 is made of a high-precision filter mesh, which can efficiently intercept impurities. The feed pipe 4 is equipped with a flow control valve to accurately control the inflow speed of NMP solvent. The cabinet door 20 and the filter cabinet 2 are connected by a firm hinge, and the opening and closing are smooth. The handle 21 conforms to the ergonomic design and is comfortable to hold. By pre-filtering the impurities of NMP solvent through the filter cabinet 2, the purity of the recovered solvent is improved, and the quality of lithium battery production is guaranteed. The slidable design of the filter plate 6 is convenient for taking out, cleaning and replacing. The cabinet door 20 is convenient for daily maintenance. The overall structure is compact and reasonable, the operation is simple, and the recovery efficiency and stability of NMP solvent in the lithium battery high-vacuum oven can be effectively improved.

[0028] Refer to Figures 1 to 6 , inside the filter cabinet 2 and slidably connected directly above the filter plate 6 is a sliding rod 8. And symmetrically fixed in the middle of the two sliding rods 8 is a cleaning brush 9 for cleaning impurities at the top end of the filter plate 6. Symmetrically formed inside the filter cabinet 2 are guiding grooves 10 for the sliding rods 8 to slide. Inside the filter cabinet 2 is formed a cavity 12. One end of the sliding rod 8 passes through the filter cabinet 2 and is fixedly installed with a connecting block 16 inside the cavity 12. Fixedly installed inside the cavity 12 is a mounting seat 13 for the connecting block 16 to slide. Fixedly installed at the top end of the mounting seat 13 is a rotating motor 14. And one end of the rotating motor 14 is rotatably connected with a driving arm 18. One end of the connecting block 16 is rotatably connected with a connecting arm 19 that is rotatably connected with the driving arm 18. At one end of the rotating motor 14 and on the top of the mounting seat 13 is fixedly installed a fixing block 15. And fixedly installed at one end of the fixing block 15 is a guiding rod 17 that is connected through and to the connecting block 16;

[0029] With the above solution: The interior of the recycling body 1 is divided into a water layer, a gas-liquid separation layer, and a liquid distributor. The water layer is at the bottommost, and the liquid distributor is at the highest. The surface of the sliding rod 8 inside the filter cabinet 2 is smooth and fits tightly with the guiding groove 10, being stable and without shaking during sliding. The bristles of the cleaning brush 9 are made of wear-resistant and soft materials, which can not only effectively clean impurities but also not damage the filter plate 6. The mounting seat 13 inside the cavity 12 is firmly welded to the cabinet wall, providing reliable support for the connecting block 16. Both the driving arm 18 and the connecting arm 19 are made of high-strength alloy, with stable transmission. The surface of the guiding rod 17 is polished, and the through connection with the connecting block 16 makes the sliding smoother. The advantage of this design is that it can automatically clean the impurities on the filter plate 6, saving manpower and improving the filtration efficiency and sustainability.

[0030] Refer to Figures 1 to 6 , fixedly installed at one end of the filter plate 6 is a clamping slide rod 7 that is slidably clamped with the fixed clamping seat 5, and the clamping slide rods 7 are symmetrically fixedly installed at both ends of the filter plate 6;

[0031] With the above solution: The clamping slide rods 7 at both ends of the filter plate 6 are made of high-strength aluminum alloy, with a smooth and wear-resistant surface, precisely fitting with the sliding clamping connection with the fixed clamping seat 5 and having a tight fit. The advantage is that it can stably install the filter plate 6, facilitate smooth sliding on the fixed clamping seat 5, and is convenient for installation and disassembly, improving the maintenance convenience.

[0032] Refer to Figures 1 to 6 , symmetrically formed at the top end of the filter plate 6 are collection grooves 11 for sediment collection of impurities;

[0033] Adopting the above solution: The collection grooves 11 symmetrically opened at the top of the filter plate 6 have smooth groove walls, appropriate depths, and their edges are in a slope shape, facilitating the sliding and accumulation of impurities. The advantage is that it can effectively collect the filtered impurities, prevent the secondary pollution of the solvent by the impurities, and at the same time facilitate subsequent centralized cleaning, improving the impurity treatment ability of the device and the overall operation stability.

[0034] Referring to Figures 1 to 6 , one end of the recovery body 1 is fixedly installed with a touch operation screen 24, and an alarm 25 is fixedly installed at one end of the touch operation screen 24.

[0035] The working principle of the present invention is as follows: The NMP solvent is put into the interior of the filter cabinet 2 through the feed pipe 4 fixedly installed at the top of the filter cabinet 2. Inside the filter cabinet 2, fixed clamping seats 5 are symmetrically and fixedly installed. The filter plate 6 is slidably clamped with the fixed clamping seats 5 through the clamping slide rods 7 symmetrically and fixedly installed at its two ends, so as to be stably installed in the filter cabinet 2. When the NMP solvent enters the filter cabinet 2, it will pass through the filter plate 6. The filter plate 6 filters the impurities therein, intercepts the impurities on the filter plate 6, and enables the relatively pure NMP solvent to continue to flow through the filter plate 6. The filtered NMP solvent enters the recovery body 1 through the connection channel that penetrates the feed port 3 at one end of the filter cabinet 2. The feed port 3 is fixedly installed at one end of the recovery body 1, providing a channel for the filtered solvent to enter the recovery body 1. The recovery body 1 can further process or store the filtered NMP solvent. When it is necessary to clean the surface of the filter plate 6, the rotation motor 14 is started, and the rotation motor 14 starts to rotate, driving the driving arm 18 connected thereto to rotate. The rotation of the driving arm 18 is transmitted to the connecting block 16 through the connecting arm 19. Since the connecting block 16 is fixedly connected to the sliding rod 8 and the connecting block 16 is sleeved on the guiding rod 17 fixedly installed at one end of the fixed block 15, the guiding rod 17 guides the sliding of the connecting block 16, so that the connecting block 16 makes a linear reciprocating motion along the guiding rod 17 on the mounting seat 13. Along with the linear reciprocating motion of the sliding rod 8, the cleaning brush 9 makes a linear reciprocating motion directly above the filter plate 6 to clean the impurities intercepted at the top of the filter plate 6. The collection grooves 11 are symmetrically opened at the top of the filter plate 6, and the cleaning brush 9 sweeps the impurities into the collection grooves 11, realizing the effective cleaning of the impurities on the surface of the filter plate 6. One end of the filter cabinet 2 is rotatably connected with a cabinet door 20, and a handle 21 is fixedly installed at one end of the cabinet door 20. When it is necessary to maintain the interior of the filter cabinet 2 or clean the impurities in the collection grooves 11, the cabinet door 20 can be opened through the handle 21, facilitating the centralized treatment of the collected impurities.

[0036] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A device for recovering NMP solvent in a high-vacuum state of a high-vacuum oven for lithium batteries, comprising a recovery body (1), one end of the recovery body (1) is fixedly installed with a feed inlet (3), and one side of the recovery body (1) opposite to the feed inlet (3) is fixedly installed with a discharge outlet (23). The top of the recovery body (1) is fixedly installed with an exhaust pipe (22), and it is characterized in that, One end of the recycling machine body (1) is provided with a filter cabinet (2) for filtering impurities of NMP solvent. The feed inlet (3) is connected to one end of the filter cabinet (2) in a penetrating manner. Inside the filter cabinet (2), a fixed card seat (5) is fixedly installed, and the fixed card seats (5) are symmetrically fixed at both ends inside the filter cabinet (2). A filter plate (6) for filtering impurities is slidably connected in the middle of the two groups of fixed card seats (5). At the top of the filter cabinet (2), a feed pipe (4) for injecting NMP solvent is fixedly installed.

2. The device for recycling NMP solvent in the high-vacuum state of a high-vacuum oven for lithium batteries according to claim 1, characterized in that, Inside the filter cabinet (2) and directly above the filter plate (6), a sliding rod (8) is slidably connected. In the middle of the two groups of sliding rods (8), a cleaning brush (9) for cleaning impurities at the top of the filter plate (6) is symmetrically fixedly installed. Inside the filter cabinet (2), guide grooves (10) for the sliding rods (8) to slide are symmetrically opened.

3. The device for recovering NMP solvent in the high vacuum state of a high vacuum oven for lithium batteries according to claim 2, characterized in that, A cavity (12) is opened inside the filter cabinet (2). One end of the sliding rod (8) penetrates the filter cabinet (2) and a connection block (16) is fixedly installed inside the cavity (12). Inside the cavity (12), a mounting seat (13) for the connection block (16) to slide is fixedly installed. At the top of the mounting seat (13), a rotating motor (14) is fixedly installed. One end of the rotating motor (14) is rotatably connected to a driving arm (18). One end of the connection block (16) is rotatably connected to a connecting arm (19) that is rotatably connected to the driving arm (18).

4. The high-vacuum state recovery NMP solvent device of a lithium battery high-vacuum oven according to claim 3, characterized in that, At one end of the rotating motor (14) and on the top of the mounting seat (13), a fixed block (15) is fixedly installed. One end of the fixed block (15) is fixedly installed with a guide rod (17) that penetrates and is connected to the connection block (16).

5. The device for recovering NMP solvent in the high vacuum state of a high vacuum oven for lithium batteries according to claim 1, characterized in that, One end of the filter plate (6) is fixedly installed with clamping slide rods (7) that are slidably clamped with the fixed card seats (5), and the clamping slide rods (7) are symmetrically fixedly installed at both ends of the filter plate (6).

6. The device for recycling NMP solvent in the high-vacuum state of a high-vacuum oven for lithium batteries according to claim 2, characterized in that On the top of the filter plate (6), collection grooves (11) for sediment collection of impurities are symmetrically opened.

7. The device for recycling NMP solvent in the high-vacuum state of a high-vacuum oven for lithium batteries according to claim 1, characterized in that, One end of the filter cabinet (2) is rotatably connected to a cabinet door (20), and one end of the cabinet door (20) is fixedly installed with a handle (21).

8. The device for recovering NMP solvent in the high vacuum state of a high vacuum oven for lithium batteries according to claim 1, wherein, One end of the recycling machine body (1) is fixedly installed with a touch operation screen (24), and one end of the touch operation screen (24) is fixedly installed with an alarm (25).

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