Metal particle management system

Abstract

The utility model discloses a kind of metal particulate matter control system, including buffer tank, buffer tank is connected with first bag filter, first bag filter is connected with several groups total filter components, total filter components have circulating filter piece, total filter components include finished product storage tank, finished product storage tank is connected with magnetic filter, magnetic filter is connected with first filter, first filter is connected with second filter, second filter is connected with packing machine;NMP in finished product storage tank is extracted by circulating pump and is sent into second bag filter, third filter, finished product storage tank, realizes the circulating filtration of NMP, can more stably filter NMP, there are less particulate matter in NMP, the multi-pass process grading filtration of NMP is realized by first bag filter, magnetic filter, first filter, second filter, avoid relying on some filter centralized to NMP, reduce the degree of jam, can improve the flow efficiency of NMP, filtering effect is good, and filtering efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of liquid filtration technology, specifically a metal particulate matter control system. Background Technology

[0002] With the development of new energy vehicles, the development of power batteries has also risen accordingly, driving the development of related upstream industrial chains. N-methylpyrrolidone (NMP), as an indispensable solvent for power batteries, has also developed due to the development of power batteries.

[0003] Impurities such as dust particles and iron are easily generated during the preparation and transportation of NMP. When residual metal particles from NMP remain in the positive electrode material of lithium batteries, the aggregation of these particles may puncture the separator between the positive electrode material and the electrolyte. This puncture can lead to a short circuit, overheating, or even fire in the lithium battery. Current technology uses a magnetic filter and a precision filter to intercept NMP particles during shipment, achieving only the final stage of control. This lacks effective control at the source. If the final filtration fails, the shipped product will have a high particulate matter content, resulting in unstable particulate matter control and the potential for particulate matter to penetrate the electrolyte separator. Utility Model Content

[0004] The purpose of this invention is to provide a metal particulate matter control system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a metal particulate matter control system, including a buffer tank, wherein the buffer tank is connected to a first bag filter, the first bag filter is connected to several sets of main filter components, and the main filter components are equipped with circulating filter elements, which can better filter particulate matter and reduce impurities in NMP;

[0006] The main filtration assembly includes a finished product storage tank, which is connected to a magnetic filter. The magnetic filter is connected to a first filter, which is connected to a second filter. The second filter is connected to a packaging machine, thus achieving multiple filtration of NMP, preventing particulate matter from accumulating in large quantities during a certain process, and improving NMP filtration efficiency.

[0007] Furthermore, the buffer tank is connected to a distillation column, which utilizes the difference in volatility of the components in the mixture to separate NMP from the mixture through countercurrent contact and phase transfer between the gas and liquid phases, thereby achieving NMP purification.

[0008] Furthermore, the circulating filter includes a circulating pump connected to a second bag filter, which in turn is connected to a third filter. The circulating pump and the third filter are connected to the finished product storage tank, enabling independent filtration of NMP in the finished product storage tank, which can effectively remove particles larger than 0.2 microns.

[0009] Furthermore, the first bag filter and the second bag filter have a filtration accuracy of 2 micrometers, the first filter has a filtration accuracy of 0.45 micrometers, the second filter has a filtration accuracy of 0.1 micrometers, and the third filter has a filtration accuracy of 0.2 micrometers, achieving a high-precision filtration of 0.1 micrometers.

[0010] Furthermore, a first cylinder is installed on the surface of the magnetic filter. The first cylinder is connected to a scraper. Several triangularly arranged magnetic rods are inserted into the scraper. The magnetic rods are connected to an assembly plate. A second cylinder connected to the assembly plate is connected to the side of the scraper through a fixed seat. The first and second cylinders can automatically remove iron filings from the magnetic rods without manual cleaning.

[0011] Furthermore, a sliding bearing is installed on the surface of the magnetic filter, and the sliding bearing is connected to a positioning rod that is connected to the scraper to ensure that the scraper moves smoothly and will not get stuck.

[0012] Furthermore, the magnetic filter has a collection box on its side, and the collection box contains a magnetic sheet that can automatically collect iron filings. The magnetic sheet prevents the iron filings from scattering and facilitates their collection.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) By using a first bag filter, a magnetic filter, a first filter and a second filter to achieve multi-stage graded filtration of NMP, it avoids relying on a single filter to concentrate on NMP, reduces the degree of clogging, improves the flow efficiency of NMP, and has a good filtration effect and high filtration efficiency.

[0015] (2) NMP is extracted from the finished product storage tank by a circulating pump and sequentially sent to the second bag filter, the third filter and the finished product storage tank to realize the circulating filtration of NMP inside the finished product storage tank. This can filter NMP more stably and reduce the amount of particulate matter in NMP.

[0016] (3) The first cylinder pushes all the magnetic rods out of the magnetic filter, and the second cylinder drives the magnetic rods to move in the scraper, which can automatically clean the iron filings on the magnetic rods into the collection box, reducing the manual cleaning operation steps and making maintenance more convenient. Attached Figure Description

[0017] Figure 1 This is a system structure diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the magnetic filter of this utility model;

[0019] Figure 3 This is a schematic diagram of the magnetic rod of this utility model being pushed out;

[0020] Figure 4 This is a schematic diagram showing the connection between the magnetic rod and the assembly plate of this utility model;

[0021] Figure 5 This is a process flow diagram of the present invention.

[0022] In the diagram: 1. Distillation column; 2. Buffer tank; 3. First bag filter; 4. Finished product storage tank; 5. Magnetic filter; 6. First filter; 7. Second filter; 8. Circulation pump; 9. Second bag filter; 10. Third filter; 11. Sliding bearing; 12. Positioning rod; 13. Collection box; 14. First cylinder; 15. Second cylinder; 16. Scraper; 17. Assembly plate; 18. Fixing seat; 19. Magnetic rod; 20. Magnetic sheet; 21. Packaging machine. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example:

[0025] Please see Figure 1-5 This utility model provides a technical solution: a metal particulate matter control system, including a buffer tank 2. When NMP flows, the buffer tank 2 reduces the pressure fluctuations and pulses of NMP, ensuring stable NMP flow. The buffer tank 2 is connected to a first bag filter 3, which is connected to several sets of total filter components. The total filter components have circulating filter elements. The circulating filter elements first circulate and filter the NMP, and then filter it through the total filter components, realizing multiple filtration of NMP and effectively filtering particulate matter.

[0026] The main filtration assembly includes a finished product storage tank 4, which is connected to a magnetic filter 5. The magnetic filter 5 collects iron filings, which can effectively reduce the amount of iron filings in NMP and achieve separate collection of iron filings. The magnetic filter 5 is connected to a first filter 6, which is connected to a second filter 7. The second filter 7 is connected to a packaging machine 21 to ensure high purity of the finished NMP, reduce the risk of electrolyte membrane puncture, and make the battery safer.

[0027] In this embodiment, as Figure 1 As shown, the buffer tank 2 is connected to a distillation column 1. The distillation column 1 separates NMP from the mixture and purifies it to high purity through countercurrent contact and phase transfer between the gas and liquid phases.

[0028] In this embodiment, as Figure 1 As shown, the circulating filter includes a circulating pump 8, which is connected to a second bag filter 9. The second bag filter 9 is connected to a third filter 10. The circulating pump 8 and the third filter 10 are connected to the finished product storage tank 4, which can perform 24-hour circulating filtration of NMP and analyze the purity of NMP. When the NMP is qualified, it is sent to the magnetic filter 5.

[0029] In this embodiment, the first bag filter 3 and the second bag filter 9 have a filtration accuracy of 2 micrometers, the first filter 6 has a filtration accuracy of 0.45 micrometers, the second filter 7 has a filtration accuracy of 0.1 micrometers, and the third filter 10 has a filtration accuracy of 0.2 micrometers. This allows for the filtration of NMP with different filtration accuracies, ensuring that all particles larger than 0.1 micrometers in the NMP are filtered out.

[0030] In this embodiment, as Figure 2 and Figure 3 As shown, a first cylinder 14 is mounted on the surface of the magnetic filter 5. The first cylinder 14 is connected to a scraper 16. Several triangularly arranged magnetic rods 19 are inserted into the scraper 16, which allows NMP to flow continuously from side to side, improving the adsorption effect of the magnetic rods 19 on iron filings in NMP. The magnetic rods 19 are connected to an assembly plate 17. A second cylinder 15 connected to the assembly plate 17 is connected to the side of the scraper 16 through a fixing seat 18. A sealing element can be installed on the scraper 16 to improve the sealing effect between the scraper 16 and the magnetic filter 5. The magnetic rods 19 are slidably connected to the scraper 16. A sealing ring is provided on the scraper 16, which has a good sealing effect and can also prevent NMP leakage.

[0031] In this embodiment, as Figure 2 and Figure 3 As shown, a sliding bearing 11 is installed on the surface of the magnetic filter 5. The sliding bearing 11 is connected to a positioning rod 12 that is connected to the scraper 16, which improves the stability of the scraper 16 and its translation, prevents the scraper 16 from shaking, and ensures high sealing accuracy between the scraper 16 and the magnetic filter 5.

[0032] In this embodiment, as Figure 2 and Figure 3 As shown, the magnetic filter 5 has a collection box 13 on its side, and a magnetic sheet 20 is provided inside the collection box 13. The magnetic sheet 20 can attract iron filings and prevent the iron filings in the collection box 13 from falling outside the collection box 13.

[0033] Specifically, during use, the NMP discharged from the distillation column 1 is sent to the buffer tank 2. The NMP is filtered through the first bag filter 3 with a diameter of 2 microns, and then stored in the finished product storage tank 4. Two finished product storage tanks 4 are set up for mutual backup. When one finished product storage tank 4 is full, it is switched to the other finished product storage tank 4.

[0034] The circulating pump 8 extracts NMP from the finished product storage tank 4 and sequentially sends the NMP into the second bag filter 9 (2 microns) and the third filter 10 (0.2 microns). Then the NMP returns to the finished product storage tank 4, thus achieving circulating filtration.

[0035] The NMP discharged from the finished product storage tank 4 is pumped sequentially into a magnetic filter 5 (12000GS), a first filter 6 (0.45 microns), and a second filter 7 (0.1 microns) for series filtration. After passing through three series filtration stages, the NMP finished product enters the packaging machine 21 (nitrogen sealing packaging system) for packaging to prevent airborne particles from entering. The particulate matter is classified and controlled, which can effectively prevent a large amount of particulate matter from accumulating in a certain filtration process, resulting in low filtration and interception efficiency or failure.

[0036] When arranging equipment such as distillation column 1, buffer tank 2, and first bag filter 3, all finished pipelines are made of stainless steel. However, due to environmental factors or welding slag during construction, many particles may remain in the pipelines and cannot be removed. Therefore, the pipelines are immediately pickled and passivated after construction to dissolve the particles in the pipelines, effectively reducing the number of particles and ensuring safer NMP quality.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal particulate matter control system, characterized in that, include: A buffer tank (2) is connected to a first bag filter (3), which is connected to several sets of main filter components, the main filter components having a circulating filter element; The total filtration assembly includes a finished product storage tank (4), which is connected to a magnetic filter (5), which is connected to a first filter (6), which is connected to a second filter (7), and the second filter (7) is connected to a packaging machine (21).

2. The metal particulate matter control system according to claim 1, characterized in that: The buffer tank (2) is connected to a distillation column (1).

3. The metal particulate matter control system according to claim 1, characterized in that: The circulating filter includes a circulating pump (8), which is connected to a second bag filter (9), which is connected to a third filter (10), and the circulating pump (8) and the third filter (10) are connected to the finished product storage tank (4).

4. The metal particulate matter control system according to claim 3, characterized in that: The first bag filter (3) and the second bag filter (9) have a filtration accuracy of 2 micrometers, the first filter (6) has a filtration accuracy of 0.45 micrometers, the second filter (7) has a filtration accuracy of 0.1 micrometers, and the third filter (10) has a filtration accuracy of 0.2 micrometers.

5. A metal particulate matter control system according to claim 1, characterized in that: The magnetic filter (5) is equipped with a first cylinder (14), which is connected to a scraper (16). Several triangularly arranged magnetic rods (19) are inserted into the scraper (16), and the magnetic rods (19) are connected to an assembly plate (17). The scraper (16) is connected to a second cylinder (15) connected to the assembly plate (17) via a fixing seat (18).

6. A metal particulate matter control system according to claim 5, characterized in that: The magnetic filter (5) is mounted with a sliding bearing (11), and the sliding bearing (11) is connected to a positioning rod (12) that is connected to the scraper (16).

7. The metal particulate matter control system according to claim 1, characterized in that: The magnetic filter (5) has a collection box (13) on its side, and the collection box (13) has a magnetic sheet (20) inside.

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