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CN-122006313-A - PP capsule filter element for lithium battery slurry filtration, preparation and application

CN122006313ACN 122006313 ACN122006313 ACN 122006313ACN-122006313-A

Abstract

The application provides a PP capsule filter element for lithium battery slurry filtration, and preparation and application thereof. The method comprises the steps of S11, providing a PP filter membrane, wherein the ventilation range of the PP filter membrane is 2800m 2 /s~5200m 2 /S, S12, winding the PP filter membrane into a hollow cylinder, welding the hollow cylinder at a joint to form a hollow PP coiled material column, S13, cutting the hollow PP coiled material column into a plurality of sections according to preset sizes, S14, providing a first end cover and a second end cover, carrying out end sealing treatment on two ends of the hollow PP coiled material column through the first end cover and the second end cover, wherein the first end cover is provided with a first through hole communicated with a hollow pipeline, S15, sealing the end-sealed hollow PP coiled material column in a shell to form a PP capsule filter core, the shell comprises a water inlet and a water outlet, the water outlet is communicated with the first through hole, a water passing channel is formed between the hollow PP coiled material column and the shell, and the water passing channel is communicated with the water inlet.

Inventors

  • Chen Cichun

Assignees

  • 厦门新禹环保科技有限公司

Dates

Publication Date
20260512
Application Date
20260112

Claims (10)

  1. 1. The preparation method of the PP capsule filter element for lithium battery slurry filtration is characterized by comprising the following steps: S11, providing a PP filter membrane, wherein the air permeability range of the PP filter membrane is 2800m 2 /s~5200m 2 /S, the bending strength of the PP filter membrane is 45N/5 cm-420N/5 cm, the elongation at break of the PP filter membrane is 16% -40%, and the hardness of the PP filter membrane is 0.03mN-9 mN; S12, winding the PP filter membrane into a hollow cylinder, and welding at a joint to form a hollow PP coiled material column; S13, cutting the hollow PP coiled material column into a plurality of sections according to a preset size; S14, providing a first end cover and a second end cover, and performing end sealing treatment on two ends of the hollow PP coiled material column through the first end cover and the second end cover, wherein the first end cover is provided with a first through hole communicated with the hollow pipeline; S15, sealing the hollow PP coiled material column subjected to end sealing in a shell to form a PP capsule filter element, wherein the shell comprises a water inlet and a water outlet, the water outlet is communicated with the first through hole, a water passing channel is formed between the hollow PP coiled material column and the shell, and the water passing channel is communicated with the water inlet.
  2. 2. The method for preparing the PP capsule filter element for lithium battery slurry filtration according to claim 1, wherein the ventilation property of the PP filter film is ：2850~2950m 2 /s,3450~3550m 2 /s,3600~3700m 2 /s,3850~3950m 2 /s,4100~4200m 2 /s,4350~4450m 2 /s,4650~4750m 2 /s,5100~5200m 2 /s;, the unit area mass of the PP filter film is ：95~105g/m 2 ,70~80g/m 2 ,55~65g/m 2 ,45~55g/m 2 ,38~42g/m 2 ,28~32g/m 2 ,18~22g/m 2 ,8~12g/m 2 ;, the bending strength of the PP filter film is ：380~420N/5cm,260~280N/5cm,230~240N/5cm,165~175N/5cm,125~135N/5cm,90~100N/5cm,60~70N/5cm,45~55N/5cm;, the breaking elongation of the PP filter film is 38-40%, 35-37%, 33-34%, 29-31%, 25-28%, 23-24%, 20-21% and 16-18%, and the hardness of the PP filter film is 6-9 mN, 3.5-4.5 mN, 2.0-3.0 mN, 1.4-1.8 mN, 0.8-1.2 mN, 0.5-0.7 mN, 0.15-0.25 mN and 0.03-0.06 mN.
  3. 3. The method of claim 1, wherein in step S14, the first end cover and the second end cover are integrally formed into a disc-shaped structure adapted to two end surfaces of the hollow PP coiled material column, and are welded to the two end surfaces of the hollow PP coiled material column along the periphery of the disc-shaped structure in a hot-melt welding manner for end sealing treatment.
  4. 4. The method for preparing the PP capsule filter element for lithium battery slurry filtration according to claim 3, wherein crisscross texture energy guiding ribs are injection molded on the end faces of the first end cover and the second end cover, and welding is performed in a mode of biting and then melting in a welding process.
  5. 5. The method for preparing a PP capsule filter element for lithium battery slurry filtration according to claim 1, wherein the outer diameter of the hollow PP coiled material column is defined as R, and the inner diameter of the shell is defined as R, wherein R is more than or equal to 1.5xr and more than or equal to 1.1xr.
  6. 6. The method for preparing the PP capsule filter element for lithium battery slurry filtration of claim 4, wherein the method comprises the following steps: R is 1.2xr.
  7. 7. The method of claim 1, wherein the housing comprises a cylindrical body and a cover body matched with the cylindrical body, and the cylindrical body and the cover body are sealed by hot melt welding.
  8. 8. The method for preparing a PP capsule filter element for lithium battery slurry filtration according to claim 1, wherein the PP filter membrane is made of wires with a wire diameter of 37 microns.
  9. 9. A PP capsule filter element for lithium battery slurry filtration is characterized in that the PP capsule filter element is prepared by the method of any one of claims 1-8.
  10. 10. Use of the PP capsule filter cartridge of claim 9 in lithium battery slurry filtration.

Description

PP capsule filter element for lithium battery slurry filtration, preparation and application Technical Field The application relates to the technical field of filter element manufacture, in particular to a PP capsule filter element for lithium battery slurry filtration, and preparation and application thereof. Background In the manufacturing process of the lithium ion battery, in order to ensure continuous and effective work of coating, the positive and negative electrode slurry is required to be filtered to intercept large particles. CN206214865U discloses a filtering core for lithium battery slurry, the filtering core is of a three-layer structure, a stainless steel support body, a stainless steel filtering screen with specific mesh number and a polypropylene fixed outer net are sequentially arranged from inside to outside, the support body, the filtering screen and the fixed outer net are coaxially arranged, the support body and the fixed outer net are of hollow structures, the filtering screen is wrapped on the surface of the support body in a manual wrapping mode and is fixed through the fixed outer net, annular grooves are formed in the outer walls of two ends of the stainless steel support body, threaded holes are formed in the inner walls of the stainless steel support body, and the middle part of the stainless steel support body is an open-pore cylinder wall. The filter element adopts single-layer polypropylene, particles are intercepted by means of the thickness direction, the filtering precision is determined by the gram weight/aperture of the felt at one time, gradient capture cannot be formed in the same filter element, large particles with the diameter of more than 100 mu m directly impact the surface, a filter cake is formed on the surface layer in a short time, and the pressure difference is rapidly increased, so that the service life of a single filter element is obviously reduced (NCM 523 slurry, solid content is 55%, and flow rate is 3L min -1 measured data). Disclosure of Invention The invention aims to solve the problems and provide a PP capsule filter element for lithium battery slurry filtration, and preparation and application thereof. The technical scheme of the application is realized as follows: the invention provides a preparation method of a PP capsule filter element for lithium battery slurry filtration, which comprises the following steps: s11, providing a PP (polypropylene) filter membrane, wherein the air permeability range of the PP filter membrane is 2800m 2/s~5200m2/S, the bending strength of the PP filter membrane is 45N/5 cm-420N/5 cm, the elongation at break of the PP filter membrane is 16% -40%, and the hardness of the PP filter membrane is 0.03 mN-9 mN; S12, winding the PP filter membrane into a hollow cylinder, and welding at a joint to form a hollow PP coiled material column; S13, cutting the hollow PP coiled material column into a plurality of sections according to a preset size; S14, providing a first end cover and a second end cover, and performing end sealing treatment on two ends of the hollow PP coiled material column through the first end cover and the second end cover, wherein the first end cover is provided with a first through hole communicated with the hollow pipeline; S15, sealing the hollow PP coiled material column subjected to end sealing in a shell to form a PP capsule filter element, wherein the shell comprises a water inlet and a water outlet, the water outlet is communicated with the first through hole, a water passing channel is formed between the hollow PP coiled material column and the shell, and the water passing channel is communicated with the water inlet. As further improvement, the air permeability of the PP filter membrane is ：2850~2950m2/s,3450~3550m2/s,3600~3700m2/s,3850~3950m2/s,4100~4200m2/s,4350~4450m2/s,4650~4750m2/s,5100~5200m2/s;, the mass per unit area corresponding to the PP filter membrane is ：95~105g/m2,70~80g/m2,55~65g/m2,45~55g/m2,38~42g/m2,28~32g/m2,18~22g/m2,8~12g/m2;, the bending strength corresponding to the PP filter membrane is ：380~420N/5cm,260~280N/5cm,230~240N/5cm,165~175N/5cm,125~135N/5cm,90~100N/5cm,60~70N/5cm,45~55N/5cm;, the breaking elongation corresponding to the PP filter membrane is 38-40%, 35-37%, 33-34%, 29-31%, 25-28%, 23-24%, 20-21%, 16-18%, and the hardness corresponding to the PP filter membrane is 6-9 mN, 3.5-4.5 mN, 2.0-3.0 mN, 1.4-1.8 mN, 0.8-1.2 mN, 0.5-0.7 mN, 0.15-0.25 mN and 0.03-0.06 mN. As a further improvement, in step S14, the first end cover and the second end cover are integrally formed as a disc-shaped structure adapted to two end surfaces of the hollow PP coiled material column, and are welded to the two end surfaces of the hollow PP coiled material column along the periphery of the disc-shaped structure by means of hot-melt welding for end sealing treatment. As a further improvement, the outer diameter of the hollow PP coiled material column is defined as R, and the inner diameter of t