Bag body structure for spray drying in production of polyanionic positive electrode material of sodium ion battery

Abstract

The utility model discloses a bag body structure for production and spray drying of a polyanion type positive electrode material of a sodium ion battery, a bag body is of a composite structure with three or more layers, the bag body at least comprises a glass fiber layer, a polypropylene layer and a polyester fiber layer which are attached to one another, the glass fiber layer is provided with a first filter hole, and the polypropylene layer is provided with a second filter hole. The polypropylene layer is provided with second filtering holes, the polyester fiber layer is provided with third filtering holes, and the first filtering holes, the second filtering holes and the third filtering holes are communicated in a staggered mode. The bag body structure for spray drying in the production of the polyanion type positive electrode material of the sodium ion battery has the characteristics of long service life, easiness in cleaning and difficulty in blockage.

Description

Technical Field

[0001] This utility model relates to the field of sodium-ion battery cathode material preparation technology, specifically to a bag structure for spray drying in the production of polyanionic cathode materials for sodium-ion batteries. Background Technology

[0002] In the production of polyanion cathode materials for sodium-ion batteries, spray drying is a commonly used drying method. During spray drying, liquid raw materials are atomized into small droplets, which are then rapidly dried by hot air to form a powdered product. This method offers relatively high production efficiency.

[0003] In the spray drying process, bags are usually used for filtration. After the spray drying equipment atomizes the liquid, other particles or contaminants are often generated. Therefore, using bag filters can effectively remove unnecessary impurities and ensure the purity and quality of the final product.

[0004] Currently, filter bags used in spray drying are typically made of high-performance filter materials, which vary depending on the application requirements and environmental conditions. Common filter bag materials include polyester fiber, polypropylene, glass fiber, and special coating materials, each with its own characteristics to meet different performance requirements.

[0005] During spray drying, the maintenance and replacement of filter bags directly affect the quality and effectiveness of spray drying filtration. Filter bag maintenance is crucial for ensuring the normal operation of the spray drying system. During use, filter bags will gradually become clogged, so regular cleaning is necessary. Methods such as reverse air blowing and vibration can be used to remove impurities adhering to the surface of the filter bags. Additionally, after a period of use, the wear and tear of the filter bags should be checked regularly, and severely worn filter bags should be replaced promptly to avoid affecting the filtration effect.

[0006] Therefore, the filter bags used in spray drying play a crucial role in the entire spray drying process, including filtration, quality improvement, and equipment protection. Any negligence can directly affect the spray drying effect. Utility Model Content

[0007] The purpose of this invention is to provide a bag structure for spray drying in the production of polyanionic cathode materials for sodium-ion batteries, which has the characteristics of long service life, easy cleaning and non-clogging.

[0008] This utility model can be achieved through the following technical solutions:

[0009] This utility model discloses a bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries. The bag is a three-layer or more composite structure, and includes at least a glass fiber layer, a polypropylene layer, and a polyester fiber layer that are bonded together. The glass fiber layer has a first filter hole, the polypropylene layer has a second filter hole, and the polyester fiber layer has a third filter hole. The first filter hole, the second filter hole, and the third filter hole are staggered and connected.

[0010] Furthermore, the diameter of the first filter hole is larger than that of the third filter hole, and the diameter of the third filter hole is larger than that of the second filter hole. This difference in pore size facilitates the passage of powder through the filter holes while also allowing for pressure changes that facilitate extrusion.

[0011] Furthermore, a polytetrafluoroethylene (PTFE) material layer is also provided on the surface of the glass fiber layer, and the PTFE material layer has a fourth filter pore that is connected to the first filter pore. By providing the PTFE material layer, the self-cleaning ability is improved to a certain extent, and the material is prevented from adhering to the inner wall of the bag after drying.

[0012] Furthermore, the glass fiber layer and the polytetrafluoroethylene material layer are co-extruded, which simplifies the process and allows for positional connectivity between them during the filtration process.

[0013] Furthermore, the glass fiber layer, polypropylene layer, and polyester fiber layer are hot-pressed together, which is a simple process and effectively reduces manufacturing costs.

[0014] Furthermore, a polytetrafluoroethylene material layer, a glass fiber layer, a polypropylene layer, and a polyester fiber layer are sequentially arranged to form the inner layer of the bag, the first intermediate layer of the bag, the second intermediate layer of the bag, and the outer layer of the bag, respectively. This arrangement is based on the temperature gradient and effectively improves the service life.

[0015] Furthermore, the fourth filter hole has a larger diameter than the first filter hole, which effectively ensures that the powder is squeezed into the filter and improves the filtration quality.

[0016] Furthermore, the thicknesses of the polytetrafluoroethylene material layer, the glass fiber layer, the polypropylene layer, and the polyester fiber layer are 1:1:2:2.

[0017] Furthermore, the polyanionic cathode material is a composite sodium ferric sulfate or a composite sodium ferric phosphate to meet the processing needs of different powder materials.

[0018] This utility model discloses a bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries, which has the following beneficial effects:

[0019] First, it has a long service life. The bag structure of this utility model is a composite structure formed by glass fiber layer, polypropylene layer and polyester fiber layer, which is suitable for use in harsh high temperature and high pressure environment and has a superior service life.

[0020] Secondly, it is easy to clean. In the bag structure of this invention, the outer polyurethane layer can be made of a polyurethane type that has been chemically treated to have self-cleaning surface properties. This significantly reduces dirt adhesion and facilitates daily cleaning and maintenance.

[0021] Third, it is not easy to clog. In the bag structure of this utility model, the first filter hole, the second filter hole, and the third filter hole are staggered and interconnected to form a stepped pressure for airflow extrusion, which effectively realizes the extrusion of powder and avoids clogging. Attached Figure Description

[0022] Appendix Figure 1 This is a schematic diagram of the structure of a bag used for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to this utility model.

[0023] The markings in the attached figures include: 100, polytetrafluoroethylene material layer; 200, glass fiber layer; 300, polypropylene layer; 400, polyester fiber layer. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the product of this utility model will be further described in detail below with reference to embodiments.

[0025] like Figure 1 As shown, this utility model discloses a bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries. The bag is a three-layer or more composite structure, and includes at least a glass fiber layer 200, a polypropylene layer 300, and a polyester fiber layer 400 that are bonded together. The glass fiber layer 200 is provided with a first filter hole, the polypropylene layer 300 is provided with a second filter hole, and the polyester fiber layer 400 is provided with a third filter hole. The first filter hole, the second filter hole, and the third filter hole are staggered and connected.

[0026] like Figure 1 As shown, to further reduce the difficulty of cleaning, a polytetrafluoroethylene material layer 100 is also provided on the surface of the glass fiber layer 200, and the polytetrafluoroethylene material layer 100 is provided with a fourth filter hole that is connected to the first filter hole.

[0027] In this invention, the glass fiber layer and polytetrafluoroethylene (PTFE) material layer are co-extruded in the bag body molding process; the glass fiber layer, polypropylene layer, and polyester fiber layer are hot-pressed together, effectively simplifying the manufacturing process.

[0028] In this invention, the stacking order between layers is clearly defined to achieve optimal results. A polytetrafluoroethylene (PTFE) layer, a glass fiber layer, a polypropylene layer, and a polyester fiber layer are sequentially arranged to form the inner layer of the bag, the first intermediate layer of the bag, the second intermediate layer of the bag, and the outer layer of the bag, respectively. Simultaneously, the thickness can be appropriately proportioned to improve service life; the thicknesses of the PTFE layer, glass fiber layer, polypropylene layer, and polyester fiber layer are in a ratio of 1:1:2:2.

[0029] In this invention, to facilitate powder filtration and penetration, the diameter of the first filter hole is larger than that of the third filter hole, the diameter of the third filter hole is larger than that of the second filter hole, and the diameter of the fourth filter hole is larger than that of the first filter hole.

[0030] In terms of material applicability, this utility model can meet the spray drying requirements of different powder materials, such as polyanionic cathode materials such as composite sodium iron sulfate or composite sodium iron phosphate.

[0031] In this utility model, the characteristics of the different material layers are as follows:

[0032] Polyester fiber layer: Offers good heat and chemical resistance, making it suitable for low-temperature and non-corrosive environments. Meanwhile, polyurethane can achieve self-cleaning surface properties through specific chemical treatments. Adding hydrophobic additives can significantly reduce dirt adhesion.

[0033] Polypropylene layer: Inexpensive and suitable for operations with low requirements for temperature and filter media.

[0034] Fiberglass layer: High temperature resistant, suitable for use in harsh environments, and can handle airflows up to 260 degrees Celsius.

[0035] Polytetrafluoroethylene (PTFE) layer: PTFE's extremely low surface energy results in excellent hydrophobicity and anti-adhesion properties, effectively reducing particle adhesion. This allows water droplets to form spherical shapes on its surface, easily sliding off and carrying away surface contaminant particles.

[0036] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] The above embodiments are merely specific examples of this utility model, and their descriptions are quite specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these obvious substitutions all fall within the protection scope of this utility model.

Claims

1. A bag structure for spray drying in the production of polyanion-type cathode materials for sodium-ion batteries, characterized in that: The bag body is a composite structure with three or more layers. The bag body includes at least a glass fiber layer, a polypropylene layer, and a polyester fiber layer that are bonded together. The glass fiber layer is provided with a first filter hole, the polypropylene layer is provided with a second filter hole, and the polyester fiber layer is provided with a third filter hole. The first filter hole, the second filter hole, and the third filter hole are staggered and connected.

2. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 1, characterized in that: The diameter of the first filter hole is larger than that of the third filter hole, and the diameter of the third filter hole is larger than that of the second filter hole.

3. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 2, characterized in that: The surface of the glass fiber layer is further provided with a polytetrafluoroethylene material layer, and the polytetrafluoroethylene material layer is provided with a fourth filter hole that is connected to the first filter hole.

4. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 3, characterized in that: The glass fiber layer and the polytetrafluoroethylene material layer are co-extruded.

5. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 4, characterized in that: The glass fiber layer, polypropylene layer, and polyester fiber layer are hot-pressed together.

6. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 5, characterized in that: The polytetrafluoroethylene material layer, glass fiber layer, polypropylene layer, and polyester fiber layer are arranged sequentially to form the inner layer of the bag, the first intermediate layer of the bag, the second intermediate layer of the bag, and the outer layer of the bag, respectively.

7. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 6, characterized in that: The diameter of the fourth filter hole is larger than that of the first filter hole.

8. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 7, characterized in that: The thicknesses of the polytetrafluoroethylene material layer, glass fiber layer, polypropylene layer, and polyester fiber layer are 1:1:2:

2.

9. The bag structure for spray drying in the production of polyanion cathode materials for sodium-ion batteries according to claim 8, characterized in that: The polyanionic cathode material is a composite sodium ferric sulfate or a composite sodium ferric phosphate.

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