Molecular sieve water removal device for lithium battery NMP solution

Abstract

The utility model belongs to the technical field of lithium battery production auxiliary equipment, and particularly relates to a lithium battery NMP (N-Methyl Pyrrolidone) solution molecular sieve dewatering device which comprises a closed bin, a water inlet pipe is arranged in the closed bin, a molecular sieve filter pipe is arranged on the lower side of the water inlet pipe, a flow guide pipe is arranged on the lower side of the molecular sieve filter pipe, and the lower end of the flow guide pipe is connected with a distillation device. And an exhaust driving device is arranged on the distillation device. The molecular sieve filter tube is arranged, the 3-angstrom molecular sieve filter plate is arranged in the molecular sieve filter tube, the diameter of water molecules is about 2.6 angstrom, and NMP molecules are large (the diameter is about 5 angstrom), so that the 3-angstrom molecular sieve can better adsorb the water molecules, but cannot adsorb the NMP molecules, the water content of an NMP solution can be effectively reduced to below 10 ppm, and the water content of the NMP solution can be effectively reduced to below 10 ppm. An activated carbon adsorption filter plate is arranged, so that when the device exhausts air, the activated carbon adsorption filter plate can adsorb volatile NMP molecules, and the NMP molecules are prevented from leaking to the outside to cause harm to a human body.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for lithium battery production, specifically relating to a molecular sieve dehydration device for NMP solution in lithium batteries. Background Technology

[0002] In the production process of lithium batteries, N-methylpyrrolidone (NMP) is widely used as an important organic solvent, such as in the coating process of electrode materials. However, NMP solutions have extremely high requirements for water content. Even a trace amount of water can have a negative impact on the performance of lithium batteries, such as causing battery capacity decay, increased internal resistance, and shortened cycle life.

[0003] Traditional dehydration methods have many drawbacks. For example, some simple desiccant adsorption methods have limited adsorption efficiency, require frequent desiccant replacement, and are cumbersome to operate. Distillation methods are energy-intensive and may cause partial decomposition of NMP due to high temperatures, affecting its quality. Molecular sieves, due to their unique porous structure, have strong adsorption selectivity and excellent adsorption capacity for water molecules, making them a significant advantage for dehydrating NMP solutions. However, existing molecular sieve-based dehydration devices still need improvement in terms of structural design, operating efficiency, and compatibility with lithium battery manufacturing processes. Therefore, we propose a molecular sieve dehydration device for NMP solutions in lithium batteries. Utility Model Content

[0004] The purpose of this invention is to provide a molecular sieve dehydration device for NMP solution in lithium batteries, which can solve the above-mentioned problems.

[0005] The specific technical solution adopted by this utility model is as follows:

[0006] A molecular sieve dehydration device for NMP solution in lithium batteries includes a sealed chamber with a circular through-hole on its upper surface. An inlet pipe is located inside the sealed chamber, with its upper end connected to the circular through-hole on the upper surface of the sealed chamber. A molecular sieve filter tube is located below the inlet pipe, and a guide pipe is located below the molecular sieve filter tube. The lower end of the guide pipe is connected to a distillation device. An outlet pipe is located on one side of the distillation device, with its upper end connected to the side surface of the distillation device. A collection tank is located below the outlet pipe. The lower surface of the sealed chamber has a circular through-hole, and the lower end of the outlet pipe passes through the circular through-hole on the lower surface of the sealed chamber. An exhaust drive device is provided on the distillation device.

[0007] Preferably, the upper surface of the enclosed compartment has a circular through hole with an opening and closing cover plate. One side of the opening and closing cover plate is hinged to the upper surface of the enclosed compartment. The enclosed compartment has an opening and closing door on one side. One side of the opening and closing door is hinged to one side of the enclosed compartment. The opening and closing door has a glass panel in the middle. The lower surface of the enclosed compartment has four support legs.

[0008] Preferably, the lower end of the water inlet pipe is provided with a flange plate, the upper and lower ends of the molecular sieve filter pipe are respectively provided with two flange plates, the upper end of the guide pipe is also provided with a flange plate, the lower end of the water inlet pipe and the upper end of the molecular sieve filter pipe are connected by flange plates and bolts, and the lower end of the molecular sieve filter pipe and the upper end of the guide pipe are connected by flange plates and bolts.

[0009] Preferably, the molecular sieve filter tube is provided with a molecular sieve filter plate, and the pore size of the molecular sieve filter plate is 3 angstroms.

[0010] Preferably, the outer ring of the distillation apparatus is fitted with an electric heating coil, a heating control switch is provided on one side surface of the electric heating coil, a temperature controller is provided on the upper surface of the heating control switch, the temperature controller is electrically connected to the heating control switch, the temperature sensing probe of the temperature controller penetrates the outer wall of the distillation apparatus and is disposed inside it, and the upper surface of the distillation apparatus is provided with a vent hole.

[0011] Preferably, the exhaust drive device has a fan blade on its output shaft, an exhaust pipe on one side of the exhaust drive device, an activated carbon adsorption filter plate inside the exhaust pipe, a circular through hole on the side wall of the sealed chamber, and one end of the exhaust pipe is connected to the circular through hole on the side wall of the sealed chamber.

[0012] The technical effects achieved by this utility model are as follows:

[0013] This utility model discloses a molecular sieve dehydration device for NMP solution in lithium batteries. By setting up a molecular sieve filter tube with a 3 angstrom molecular sieve filter plate inside, water molecules with a diameter of about 2.6 angstroms can pass through, while NMP molecules are larger (about 5 angstroms or more in diameter). Therefore, the 3 angstrom molecular sieve can better adsorb water molecules but will not adsorb NMP molecules. It can effectively reduce the water content of NMP solution to below 10 ppm. By setting up a distillation device and a temperature control device, water molecules can be effectively evaporated during solution distillation without affecting NMP molecules. By setting up an activated carbon adsorption filter plate, the activated carbon adsorption filter plate can adsorb the volatilized NMP molecules when the device is venting, preventing them from leaking into the outside world and causing harm to the human body. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the lithium battery NMP solution molecular sieve dehydration device of this utility model;

[0015] Figure 2 This is a utility model Figure 1 Enlarged schematic diagram of a local structure at point A;

[0016] Figure 3 This is a utility model Figure 1 Enlarged schematic diagram of the local structure at point B;

[0017] Figure 4 This is a schematic diagram of the isometric structure of the lithium battery NMP solution molecular sieve dehydration device of this utility model.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Enclosed chamber; 101. Opening and closing cover; 102. Opening and closing door; 103. Glass panel; 2. Water inlet pipe; 3. Molecular sieve filter tube; 4. Guide pipe; 5. Distillation device; 501. Electric heating coil; 502. Heating control switch; 503. Thermostat; 504. Vent hole; 6. Water outlet pipe; 7. Collector tank; 8. Exhaust drive device; 801. Fan blade; 802. Exhaust pipe; 803. Activated carbon adsorption filter plate. Detailed Implementation

[0020] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0021] like Figures 1-2 As shown, a molecular sieve dehydration device for NMP solution in lithium batteries includes a sealed chamber 1. The upper surface of the sealed chamber 1 is provided with a circular through hole. A water inlet pipe 2 is provided inside the sealed chamber 1. The upper end of the water inlet pipe 2 is connected to the circular through hole on the upper surface of the sealed chamber 1. A molecular sieve filter pipe 3 is provided on the lower side of the water inlet pipe 2. A guide pipe 4 is provided on the lower side of the molecular sieve filter pipe 3. The lower end of the guide pipe 4 is connected to a distillation device 5. A water outlet pipe 6 is provided on one side of the distillation device 5. The upper end of the water outlet pipe 6 is connected to the side surface of the distillation device 5. A collection tank 7 is provided on the lower side of the water outlet pipe 6. The lower surface of the sealed chamber 1 is provided with a circular through hole. The lower end of the water outlet pipe 6 passes through the circular through hole on the lower surface of the sealed chamber 1. An exhaust drive device 8 is provided on the distillation device 5.

[0022] like Figures 1-2 As shown, the NMP solution enters the device through the inlet pipe 2 and is guided into the molecular sieve filter tube 3 through the inlet pipe 2. Under the action of gravity, it is filtered through the molecular sieve filter tube 3 and then enters the distillation device 5 through the guide pipe 4 to remove a small amount of water. After distilling out water molecules by the temperature difference between the boiling point of water (100 degrees Celsius) and the boiling point of NMP (200 degrees Celsius), the solution enters the collection tank 7 through the outlet pipe 6 for collection.

[0023] like Figure 1As shown, an opening and closing cover plate 101 is provided on the circular through hole on the upper surface of the closed chamber 1. One side of the opening and closing cover plate 101 is hinged to the upper surface of the closed chamber 1. An opening and closing door 102 is provided on one side of the closed chamber 1. One side of the opening and closing door 102 is hinged to one side of the closed chamber 1. A glass panel 103 is provided in the middle of the opening and closing door 102. Four support legs are provided on the lower surface of the closed chamber 1.

[0024] like Figure 1 As shown, the function of the opening and closing cover plate 101 is to seal the upper end of the water inlet pipe 2, so that the device is in a closed state for water removal operations. This is because NMP is toxic and volatile, and the operation must be carried out in a closed system.

[0025] like Figure 1 As shown, the lower end of the water inlet pipe 2 is provided with a flange plate, the upper and lower ends of the molecular sieve filter pipe 3 are respectively provided with two flange plates, the upper end of the guide pipe 4 is also provided with a flange plate, the lower end of the water inlet pipe 2 and the upper end of the molecular sieve filter pipe 3 are connected by flange plates and bolts, and the lower end of the molecular sieve filter pipe 3 and the upper end of the guide pipe 4 are connected by flange plates and bolts.

[0026] like Figure 1 As shown, the molecular sieve filter tube 3 can be removed to dry the molecular sieve filter plate inside. By setting multiple molecular sieve filter tubes 3, they can be reused repeatedly, thereby improving the efficiency of the device.

[0027] like Figures 1-4 As shown, the molecular sieve filter tube 3 is equipped with a molecular sieve filter plate, and the pore size of the molecular sieve filter plate is 3 angstroms.

[0028] like Figures 1-4 As shown, the reason for setting the pore size of the molecular sieve filter plate to 3 angstroms is that the diameter of water molecules is about 2.6 angstroms, while NMP molecules are larger (about 5 angstroms or more in diameter). Therefore, using a 3 angstrom molecular sieve can better adsorb water molecules, but will not adsorb NMP molecules.

[0029] like Figures 1-3 As shown, the outer ring of the distillation apparatus 5 is fitted with an electric heating coil 501. A heating control switch 502 is provided on one side surface of the electric heating coil 501. A temperature controller 503 is provided on the upper surface of the heating control switch 502. The temperature controller 503 is electrically connected to the heating control switch 502. The temperature sensing probe of the temperature controller 503 penetrates the outer wall of the distillation apparatus 5 and is located inside it. A vent hole 504 is provided on the upper surface of the distillation apparatus 5.

[0030] like Figures 1-3As shown, the heating control switch 502 controls the electric heating coil 501 to heat the distillation apparatus 5. The temperature controller 503 probe is installed in the distillation apparatus 5. When the NMP solution in the distillation apparatus 5 is heated to 100 degrees, the temperature controller 503 controls the heating control switch 502 to turn off the power. When the temperature in the distillation apparatus 5 is lower than 90 degrees, the temperature controller 503 controls the heating control switch 502 to turn on the power, so that the electric heating coil 501 continues to heat.

[0031] like Figures 1-4 As shown, the exhaust drive device 8 has a fan blade 801 on its output shaft, an exhaust pipe 802 on one side of the exhaust drive device 8, an activated carbon adsorption filter plate 803 inside the exhaust pipe 802, a circular through hole on the side wall of the closed chamber 1, and one end of the exhaust pipe 802 is connected to the circular through hole on the side wall of the closed chamber 1.

[0032] like Figures 1-4 As shown, the activated carbon adsorption filter plate 803 is used to adsorb volatilized NMP molecules and prevent NMP molecules from leaking and causing harm to the human body.

[0033] The working principle of this invention is as follows: In actual use, the NMP solution enters the device through the inlet pipe 2, and is then guided into the molecular sieve filter tube 3. Under the action of gravity, it is filtered through the molecular sieve filter plate in the molecular sieve filter tube 3, and then enters the distillation device 5 through the guide pipe 4. The heating control switch 502 controls the electric heating coil 501 to heat the distillation device 5. The temperature controller 503 probe is set in the distillation device 5. When the NMP solution in the distillation device 5 is heated to 100 degrees Celsius, the water molecules in the solution evaporate. At the same time, the temperature controller 503 controls the heating control... When switch 502 is de-energized, and the temperature in distillation apparatus 5 is below 90 degrees Celsius, temperature controller 503 controls heating control switch 502 to be energized, so that electric heating coil 501 continues to heat, and performs re-distillation to remove a small amount of water. Finally, the dehydrated NMP solution enters the collection tank 7 through water outlet pipe 6 for collection. The temperature controller 503 in this apparatus is a Eurotherm 3216 model temperature controller with a temperature range of 0 degrees Celsius to 400 degrees Celsius (it can be set to 80 degrees Celsius to 105 degrees Celsius during use, that is, it is energized below 80 degrees Celsius and de-energized above 105 degrees Celsius).

[0034] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional methods in the field.

Claims

1. A molecular sieve dehydration device for NMP solution in lithium batteries, characterized in that: The device includes a closed chamber (1), the upper surface of which is provided with a circular through hole. A water inlet pipe (2) is provided inside the closed chamber (1). The upper end of the water inlet pipe (2) is connected to the circular through hole on the upper surface of the closed chamber (1). A molecular sieve filter pipe (3) is provided on the lower side of the water inlet pipe (2). A guide pipe (4) is provided on the lower side of the molecular sieve filter pipe (3). A distillation device (5) is connected to the lower end of the guide pipe (4). A water outlet pipe (6) is provided on one side of the distillation device (5). The upper end of the water outlet pipe (6) is connected to the side surface of the distillation device (5). A collection tank (7) is provided on the lower side of the water outlet pipe (6). A circular through hole is provided on the lower surface of the closed chamber (1). The lower end of the water outlet pipe (6) passes through the circular through hole on the lower surface of the closed chamber (1). An exhaust drive device (8) is provided on the distillation device (5).

2. The lithium battery NMP solution molecular sieve dehydration device according to claim 1, characterized in that: An opening and closing cover plate (101) is provided on the circular through hole on the upper surface of the closed chamber (1). One side of the opening and closing cover plate (101) is hinged to the upper surface of the closed chamber (1). An opening and closing door (102) is provided on one side of the closed chamber (1). One side of the opening and closing door (102) is hinged to one side of the closed chamber (1). A glass panel (103) is provided in the middle of the opening and closing door (102). Four support legs are provided on the lower surface of the closed chamber (1).

3. The lithium battery NMP solution molecular sieve dehydration device according to claim 2, characterized in that: The lower end of the water inlet pipe (2) is provided with a flange plate, the upper and lower ends of the molecular sieve filter pipe (3) are respectively provided with two flange plates, the upper end of the guide pipe (4) is also provided with a flange plate, the lower end of the water inlet pipe (2) and the upper end of the molecular sieve filter pipe (3) are connected by flange plates and bolts, and the lower end of the molecular sieve filter pipe (3) and the upper end of the guide pipe (4) are connected by flange plates and bolts.

4. The lithium battery NMP solution molecular sieve dehydration device according to claim 3, characterized in that: The molecular sieve filter tube (3) is equipped with a molecular sieve filter plate, and the pore size of the molecular sieve filter plate is 3 angstroms.

5. The lithium battery NMP solution molecular sieve dehydration device according to claim 4, characterized in that: An electric heating coil (501) is fitted around the outer ring of the distillation apparatus (5). A heating control switch (502) is provided on one side surface of the electric heating coil (501). A temperature controller (503) is provided on the upper surface of the heating control switch (502). The temperature controller (503) is electrically connected to the heating control switch (502). The temperature sensing probe of the temperature controller (503) penetrates the outer wall of the distillation apparatus (5) and is located inside it. A vent hole (504) is provided on the upper surface of the distillation apparatus (5).

6. The lithium battery NMP solution molecular sieve dehydration device according to claim 1, characterized in that: The exhaust drive device (8) has a fan blade (801) on its output shaft. An exhaust pipe (802) is provided on one side of the exhaust drive device (8). An activated carbon adsorption filter plate (803) is provided inside the exhaust pipe (802). A circular through hole is provided on the side wall of the closed chamber (1). One end of the exhaust pipe (802) is connected to the circular through hole on the side wall of the closed chamber (1).

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