Classification demagnetizing filter for lithium battery slurry

Abstract

The utility model discloses a lithium battery slurry grading demagnetizing filter which comprises a shell, a feed port and a discharge port are arranged on the shell, a plurality of demagnetizing filter components are arranged in the shell, the plurality of demagnetizing filter components are uniformly distributed in the shell, and the feed port and the discharge port are arranged on the shell. The demagnetizing filter assembly comprises a filter rod and a demagnetizing rod arranged in the filter rod, and the aperture of the filter rod close to the feeding port is larger than that of the filter rod close to the discharging port. According to the utility model, the plurality of demagnetizing and filtering assemblies are arranged, so that the combination of filtering and demagnetizing is realized, and large-particle substances and magnetic substances in the lithium battery slurry can be removed when the lithium battery slurry flows through the shell, so that the treatment procedures of the lithium battery slurry are effectively reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery slurry preparation technology, and in particular to a graded demagnetizing filter for lithium battery slurry. Background Technology

[0002] During the preparation of positive and negative electrode slurries for lithium-ion batteries, it is necessary to remove hard particles and magnetic materials (Fe / Cr / Ni / Zn) from the slurry. The purpose is twofold: first, to improve the quality of coated electrodes and reduce defects such as coating lines and particle scratches that lead to scrapping of the electrodes; and second, to prevent magnetic materials present in the slurry from affecting the electrochemical performance and even the battery safety performance during charging and discharging.

[0003] Currently, the commonly used filters are mainly single-stage disposable filters, which are prone to clogging and have a short lifespan. When replacing them, the slurry inside the bladder cannot be recovered, resulting in a large amount of waste. Furthermore, the devices for removing magnetic materials from the slurry are mainly simple iron separators. However, the contact area between the simple iron separator and the slurry is limited, which limits the ability to remove magnetic materials, thus reducing the quality of the electrode slurry and production efficiency. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a lithium battery slurry graded demagnetizing filter.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A lithium battery slurry grading and demagnetizing filter includes: a housing, an inlet and an outlet on the housing, and a demagnetizing filter assembly inside the housing. Multiple demagnetizing filter assemblies are evenly distributed within the housing. Each demagnetizing filter assembly includes a filter rod and a demagnetizing rod disposed within the filter rod. The pore size of the filter rod near the inlet is larger than the pore size near the outlet.

[0007] In one embodiment, the housing includes an upper steel shell and a lower steel shell, which are combined to form a hollow, sealed housing.

[0008] In one embodiment, the feed inlet is located at the bottom of the lower steel shell and communicates with the interior of the shell, while the discharge outlet is located at the top of the upper steel shell and communicates with the interior of the shell.

[0009] In one embodiment, the filter rod has a plurality of filter rod holes, which are evenly distributed on the filter rod.

[0010] In one embodiment, the filter rod is hollow, the demagnetizing rod is located at the center of the filter rod and is arranged along the length of the filter rod, and the magnetic field strength of the demagnetizing rod is 10000-12000GS.

[0011] In one embodiment, the gap between the demagnetizing rod and the inner wall of the filter rod is 3mm-20mm.

[0012] In one embodiment, a filter baffle is provided at the middle position of the housing, and multiple demagnetizing filter components are installed on the filter baffle. The filter baffle is provided with multiple mounting holes, and multiple filter rods are correspondingly inserted into the multiple mounting holes.

[0013] In one embodiment, the diameter of the filter rod hole at the lower position relative to the filter partition is larger than the diameter of the filter rod hole at the upper position relative to the filter partition.

[0014] In one embodiment, the pore size of the filter rod at the lower position relative to the filter partition is 40μm-50μm, and the pore size of the filter rod at the upper position relative to the filter partition is 10μm-20μm.

[0015] In one embodiment, there are no fewer than four demagnetizing filter components.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] 1. The lithium battery slurry graded demagnetizing filter of this utility model combines filtration and demagnetization by setting multiple demagnetizing filtration components. Large particles and magnetic materials in the lithium battery slurry can be removed during the process of the lithium battery slurry flowing through the shell, which effectively reduces the processing steps of lithium battery slurry and reduces production costs.

[0018] 2. The lithium battery slurry graded demagnetizing filter of this utility model increases the filtration design by adopting a graded filtration method for the filter rod, thereby increasing the filtration throughput of the slurry, enhancing the filtration efficiency for particles in the slurry, reducing slurry waste caused by cleaning or replacing the filter, extending the service life of the filter element, and at the same time increasing the magnetic source to more efficiently adsorb magnetic substances in the slurry and improve production efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0020] Figure 1This is a cross-sectional structural diagram of a lithium battery slurry graded demagnetizing filter provided by this utility model.

[0021] Figure descriptions: 10. Shell; 101. Upper steel shell; 102. Lower steel shell; 11. Inlet; 12. Outlet; 20. Demagnetizing filter assembly; 21. Filter rod; 211. Filter rod hole; 22. Demagnetizing rod; 30. Filter baffle; 31. Mounting hole. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0023] A lithium battery slurry graded demagnetizing filter, referenced Figure 1 The system includes a housing 10, which has an inlet 11 and an outlet 12. Multiple demagnetizing filter components 20 are provided inside the housing 10, arranged along the length of the housing 10 and evenly distributed within it. Specifically, the demagnetizing filter component 20 includes a filter rod 21 and demagnetizing rods 22 disposed within the filter rod 21. The pore size of the filter rod 21 near the inlet 11 is larger than the pore size of the filter rod 21 near the outlet 12. Thus, during the process of the lithium battery slurry entering the filter from the inlet 11 and flowing out from the outlet 12, the demagnetizing rod 22 will adsorb the magnetic substances in the lithium battery slurry. At the same time, large particles in the lithium battery slurry will be filtered by the filter rod 21. Since the pore size of the filter rod 21 near the inlet 11 is larger than that near the outlet 12, the large particles in the lithium battery slurry will be filtered in stages during the flow of the filter rod 21, thereby improving the filtration efficiency.

[0024] Furthermore, referring to Figure 1 The shell 10 includes an upper steel shell 101 and a lower steel shell 102, which are combined to form a cylindrical shell 10. Specifically, the upper steel shell 101 and the lower steel shell 102 are connected by clamps, and the two opposite outer sides of the upper steel shell 101 and the lower steel shell 102 are connected by clamps to form a hollow and sealed shell 10.

[0025] Furthermore, referring to Figure 1The inlet 11 is located at the lower end of the housing 10, and the outlet 12 is located at the upper end of the housing 10. Specifically, the inlet 11 is located at the bottom of the lower steel shell 102 and communicates with the interior of the housing 10. The outlet 12 is located at the top of the upper steel shell 101 and communicates with the interior of the housing 10. The lithium battery slurry flows into the housing 10 through the inlet 11, passes through multiple demagnetizing filter components 20 within the housing 10, and then flows out through the outlet 12. It should be noted that when the lithium battery slurry enters the housing 10 through the inlet 11 at the bottom of the housing 10, it expels the air inside the housing 10, thus eliminating the need for additional venting operations on the housing 10.

[0026] Furthermore, referring to Figure 1 The filter rod 21 is cylindrical or polygonal, and has multiple filter rod holes 211 evenly distributed on it. The filter rod 21 is used to filter large particles in the lithium battery slurry. By using a cylindrical filter rod 21 with multiple filter rod holes 211, large particles in the lithium battery slurry are filtered out, and the filtered slurry flows through the filter rod 21 towards the outlet 12. It should be noted that this invention does not limit the size or number of filter rods 21; the size and number can be determined according to actual filtration requirements.

[0027] Furthermore, referring to Figure 1 The filter rod 21 is hollow, and the demagnetizing rod 22 is located at the center of the filter rod 21, extending along its length. The demagnetizing rod 22 is detachable from the filter rod 21 via a threaded connection, allowing for individual removal for cleaning or replacement. The demagnetizing rod 22 is used to adsorb magnetic materials within the lithium battery slurry. Specifically, the demagnetizing rod 22 uses a rubidium magnet with stronger magnetic attraction to enhance the adsorption effect on magnetic materials in the lithium battery slurry. It should be noted that the magnetic field strength of the demagnetizing rod 22 is 10000-12000 GS.

[0028] Furthermore, referring to Figure 1 The gap between the demagnetizing rod 22 and the inner wall of the filter rod 21 is 3mm-20mm. The gap between the demagnetizing rod 22 and the filter rod 21 is used to allow the lithium battery slurry to pass through, and the gap is not too large to ensure the adsorption effect of the demagnetizing rod 22.

[0029] Reference Figure 1A filter partition 30 is provided at the middle of the housing 10, spanning the diameter of the housing 10 and dividing the housing 10 into two filtration spaces. Multiple demagnetizing filter components 20 are mounted on the filter partition 30. Specifically, the filter partition 30 has multiple mounting holes 31, into which multiple filter rods 21 are inserted to fix them to the filter partition 30. The multiple filter rods 21 are arranged along the length of the housing 10, and the filter partition 30 divides the multiple filter rods 21 into two different filtration levels.

[0030] Furthermore, referring to Figure 1 The aperture of the filter rod 21 at the lower position relative to the filter separator 30 is larger than the aperture of the filter rod 21 at the upper position relative to the filter separator 30. This allows the lithium battery slurry to flow from the lower aperture of the filter rod 211 to the upper aperture of the filter rod 211, and finally out of the outlet 12. It should be noted that the aperture of the filter rod 211 at the lower position relative to the filter separator 30 is 40μm-50μm to filter particles larger than 40μm in the lithium battery slurry. The aperture of the filter rod 211 at the upper position relative to the filter separator 30 is 10μm-20μm to filter particles larger than 20μm in the lithium battery slurry, thus achieving a graded filtration effect for the lithium battery slurry.

[0031] Furthermore, referring to Figure 1 The filter baffle 30 is detachably installed inside the housing 10. When the filter rod 21 needs to be cleaned or replaced, the housing 10 can be opened by separating the upper steel housing 101 and the lower steel housing 102, so that the filter baffle 30 can be taken out to clean or replace the filter rod 21.

[0032] Reference Figure 1 In this invention, there are at least four demagnetizing filter components 20 to improve the filtration efficiency of the lithium battery slurry. The lithium battery slurry enters the housing 10 through the inlet 11. It is first filtered through the filter rod holes 211 of multiple filter rods 21 located below the filter partition 30. Then, it reaches the demagnetizing rod 22 within the filter rod 21 for demagnetization and adsorption. It then flows through the gap between the demagnetizing rod 22 and the filter rod 21 to the area above the filter rod 21 relative to the filter partition 30, flows into the upper steel shell 101 through the smaller aperture filter rod holes 211, and flows out through the outlet 12, thus completing the layered filtration and demagnetization process. It should be noted that the filter partition 30 divides the housing 10 into two separately sealed spaces: the upper steel shell 101 and the lower steel shell 102, so that the lithium battery slurry located in the lower steel shell 102 will not flow into the upper steel shell 101, thus ensuring the filtration effect.

[0033] This invention combines filtration and demagnetization by incorporating multiple demagnetizing filter components 20. Large particles and magnetic materials in the lithium battery slurry are removed as it flows through the housing 10, effectively reducing the number of processing steps and lowering production costs. Furthermore, the filter rod 21 employs a staged filtration method to enhance the filtration design, increase the slurry filtration throughput, improve the filtration efficiency for particles within the slurry, reduce slurry waste caused by cleaning or replacing filters, extend the filter element's lifespan, and simultaneously increase the magnetic source for more efficient adsorption of magnetic materials in the slurry, thereby improving production efficiency.

[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A lithium battery slurry graded demagnetizing filter, characterized in that, include: The housing (10) is provided with an inlet (11) and an outlet (12). The housing (10) is provided with a demagnetizing filter assembly (20). There are multiple demagnetizing filter assemblies (20), which are evenly distributed in the housing (10). Each demagnetizing filter assembly (20) includes a filter rod (21) and a demagnetizing rod (22) disposed in the filter rod (21). The pore size of the filter rod (21) near the inlet (11) is larger than that of the filter rod (21) near the outlet (12).

2. The lithium battery slurry graded demagnetizing filter according to claim 1, characterized in that, The shell (10) includes an upper steel shell (101) and a lower steel shell (102), which are combined to form a hollow and sealed shell (10).

3. A lithium battery slurry graded demagnetizing filter according to claim 2, characterized in that, The feed inlet (11) is located at the bottom of the lower steel shell (102) and is connected to the inside of the shell (10). The discharge outlet (12) is located at the top of the upper steel shell (101) and is connected to the inside of the shell (10).

4. A lithium battery slurry graded demagnetizing filter according to claim 3, characterized in that, The filter rod (21) has a plurality of filter rod holes (211) which are evenly distributed on the filter rod (21).

5. A lithium battery slurry graded demagnetizing filter according to claim 4, characterized in that, The filter rod (21) is hollow, and the demagnetizing rod (22) is located at the center of the filter rod (21) and is arranged along the length of the filter rod (21). The magnetic field strength of the demagnetizing rod (22) is 10000-12000GS.

6. A lithium battery slurry graded demagnetizing filter according to claim 5, characterized in that, The gap between the demagnetizing rod (22) and the inner wall of the filter rod (21) is 3mm-20mm.

7. A lithium battery slurry graded demagnetizing filter according to claim 6, characterized in that, A filter baffle (30) is provided in the middle of the housing (10), and multiple demagnetizing filter components (20) are installed on the filter baffle (30). Multiple mounting holes (31) are provided on the filter baffle (30), and multiple filter rods (21) are inserted into the multiple mounting holes (31).

8. A lithium battery slurry graded demagnetizing filter according to claim 7, characterized in that, The diameter of the filter rod hole (211) at the lower position of the filter rod (21) relative to the filter partition (30) is larger than the diameter of the filter rod hole (211) at the upper position of the filter rod (21) relative to the filter partition (30).

9. A lithium battery slurry graded demagnetizing filter according to claim 8, characterized in that, The diameter of the filter rod (21) at the lower position relative to the filter partition (30) is 40μm-50μm, and the diameter of the filter rod (21) at the upper position relative to the filter partition (30) is 10μm-20μm.

10. A lithium battery slurry graded demagnetizing filter according to claim 1, characterized in that, The demagnetizing filter assembly (20) shall be no less than four.

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