Coating slurry backflow filtering device
By incorporating buffer and filtration components during the lithium-ion battery separator coating process, the problem of unstable slurry recirculation filtration was solved, improving coating stability and separator yield, enabling slurry reuse, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-03-31
AI Technical Summary
In the current lithium-ion battery separator coating process, the stability of slurry reflux filtration is low, which easily leads to clogging and slurry backflow, affecting the orderliness of coating and the yield of separators.
The system employs buffer and liquid sensing components to monitor slurry flow, and combines them with filtration and pumping components. Through buffer and filtration structure design, it avoids slurry backflow and agglomeration, thereby improving the stability and orderliness of reflux recovery filtration.
This improved the stability of the coating process and the yield of the diaphragm, enabled the reuse of the slurry, and reduced production costs.
Smart Images
Figure CN224056795U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lithium-ion battery production and processing technology, and in particular relates to a coating slurry return filtration device. Background Technology
[0002] Lithium-ion batteries, with their advantages of light weight and good safety performance, have achieved a dominant position in the application of mobile electronic devices such as Bluetooth headsets, mobile phones, laptops, tablets, and cameras, as well as portable power banks. They are also being used in large quantities in electric motorcycles and electric vehicles. A lithium-ion battery mainly consists of positive and negative electrodes and a separator in between. The separator acts as a barrier between the positive and negative electrodes, preventing direct contact and short circuits. Currently, separators are mainly porous media composed of polyolefins such as polyethylene and polypropylene. Polyolefin separators have melting points of 200 degrees Celsius or lower. When the battery experiences a short circuit due to internal or external factors, causing the temperature to rise, it is prone to shrinkage, leading to a short circuit between the positive and negative electrodes, resulting in thermal runaway and a fire. Internal causes mainly include uneven electrode surfaces or sharp foreign objects introduced during battery assembly, which can damage the separator and cause a short circuit. External causes mainly include sharp objects puncturing the battery, causing a short circuit. To address the aforementioned issues, the industry has coated the diaphragm surface with a porous insulating layer composed of inorganic particles. This porous insulating layer can prevent direct contact between the positive and negative electrodes when the diaphragm shrinks or breaks, thereby avoiding fire problems.
[0003] Before coating the diaphragm, the surface of the diaphragm needs to be coated with slurry. However, when recovering excess slurry during the coating process, blockages may occur, leading to slurry accumulation or even backflow and overflow. This reduces the stability of the reflux recovery filtration and affects the orderly feeding. Utility Model Content
[0004] The purpose of this invention is to provide a coating slurry reflux filtration device that addresses the shortcomings of existing technologies and solves the technical problem of low stability in existing reflux recycling filtration.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A coating slurry reflux filtration device includes a reflux collection container, a buffer component, a filter component, a liquid extraction component, and a feeding container; the output end of the reflux collection container is connected to the interior of the buffer component; the buffer component is equipped with a liquid sensing component; the input end of the filter component is connected to the interior of the buffer component; the output end of the filter component is connected to the input end of the liquid extraction component; and the output end of the liquid extraction component is connected to the interior of the feeding container.
[0007] Preferably, the liquid sensing component is a first liquid level sensor; the first liquid level sensor is arranged transversely along the slurry conveying direction inside the buffer component.
[0008] Preferably, the buffer component is provided with an input pipe and an output pipe; the input pipe is connected to the reflux collection container; the output pipe is connected to the filter component; the input pipe is located at the upper end of the buffer component; and the output pipe is located at the lower end of the buffer component.
[0009] Furthermore, the slurry flow direction of the input pipe is misaligned with or partially overlaps with the slurry flow direction of the output pipe.
[0010] Preferably, the buffer component has a flow guiding slope on the inner wall near the output pipe; the angle between the flow guiding slope and the horizontal plane it is on is α, and α satisfies: 20°≤α≤75°.
[0011] Preferably, the reflux collection container is provided with a second liquid level sensor inside; and / or, the inner wall of the feeding container is provided with a third liquid level sensor.
[0012] Preferably, the coating slurry return filtration device further includes a feeding pump, a material box, and a coating roller; the input end of the feeding pump is connected to the interior of the feeding container; the output end of the feeding pump is connected to the material box; the material box is connected to the coating roller; and the coating roller is positioned directly above the return collection container.
[0013] Preferably, the filtering component includes a protective shell and a filter screen connected inside the protective shell; the upper end of the protective shell is connected to the buffer component; and the lower end of the protective shell is connected to the liquid extraction component.
[0014] Preferably, the filter screen has a mesh size of at least 50 mesh.
[0015] Preferably, the protective shell includes an upper shell and a lower shell connected to each other; and a filter cavity is provided between the upper shell and the lower shell; the filter cavity is connected to the buffer component; the filter cavity is connected to the liquid extraction component; the filter screen is disposed inside the filter cavity, and the filter screen is detachably connected to the inside of the lower shell.
[0016] Preferably, the filter screen includes a support ring and a screen body connected inside the support ring; the support ring is detachably connected to the interior of the lower housing; and the screen body is arranged perpendicular to the conduction direction of the filter cavity.
[0017] The beneficial effects of this utility model are as follows: By assembling a buffer component between the reflux collection container and the filter component, and combining it with the monitoring and sensing function of the liquid sensing component to detect the slurry inside the buffer component, the output speed of the slurry can be effectively buffered, avoiding backflow and spraying when too much slurry reaches the filter component. This improves the stability and orderliness of the reflux recovery filtration. Furthermore, after the slurry is filtered by the filter component, it prevents the formation of particles or agglomerates when the slurry is transported to the feeding container. This avoids scratches caused by agglomerated or large particles of slurry being re-coated onto the diaphragm surface, thus improving the stability and orderliness of the reflux recovery filtration. It also helps to improve the yield of diaphragm coating and realizes the reuse of slurry, reducing production costs. Attached Figure Description
[0018] The following will refer to the appendix. Figures 1-5 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.
[0019] Figure 1 This is a schematic diagram of the structure of a coating slurry recirculation filtration device according to an embodiment of the present invention;
[0020] Figure 2 This is a cross-sectional view of a coating slurry recirculation filtration device according to an embodiment of the present invention;
[0021] Figure 3 This is a schematic diagram of the structure of the buffer component of a coating slurry recirculation filtration device according to an embodiment of the present invention;
[0022] Figure 4 This is a schematic diagram of the structure of the filter component of a coating slurry recirculation filtration device according to an embodiment of the present invention;
[0023] Figure 5 This is a schematic diagram of the structure of a coating slurry return filtration device according to an embodiment of the present invention.
[0024] In the diagram: 1-Recirculation collection container; 11-Second liquid level sensor; 2-Buffer component; 21-Input pipe; 22-Output pipe; 23-Guiding slope; 3-Filter component; 31-Protective shell; 311-Upper shell; 312-Lower shell; 313-Mounting groove; 314-Inner extension edge; 32-Filter screen body; 321-Screen body; 322-Support ring; 323-Limiting protrusion; 4-Liquid extraction component; 5-Feeding container; 51-Third liquid level sensor; 6-Liquid sensing component; 61-First liquid level sensor; 7-Feeding pump; 8-Coating roller; 9-Material box. Detailed Implementation
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.
[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0030] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.
[0031] like Figure 1As shown, in one embodiment of this utility model, the coating slurry reflux filtration device includes a reflux collection container 1, a buffer component 2, a filter component 3, a liquid extraction component 4, and a feeding container 5. The output end of the reflux collection container 1 is connected to the interior of the buffer component 2. A liquid sensing component 6 is provided inside the buffer component 2. The input end of the filter component 3 is connected to the interior of the buffer component 2. The output end of the filter component 3 is connected to the input end of the liquid extraction component 4. The output end of the liquid extraction component 4 is connected to the interior of the feeding container 5. The liquid extraction component 4 is a liquid pump.
[0032] The technical solution of this utility model employs a buffer component assembled between the reflux collection container and the filter component, combined with a liquid sensing component to monitor the slurry inside the buffer component. This effectively buffers the slurry output rate, preventing backflow and spraying when excessive slurry reaches the filter component. This improves the stability and orderliness of the reflux filtration process. Furthermore, the filtration component prevents the slurry from forming particles or agglomerates after being transported to the feeding container. This avoids scratches caused by agglomerated or large particles of slurry being re-coated onto the diaphragm surface, further enhancing the stability and orderliness of the reflux filtration process. It also improves the yield rate of diaphragm coating, enables slurry reuse, and reduces production costs.
[0033] Specifically, in some implementations, such as Figure 1 and 2 As shown, the liquid sensing component 6 is a first liquid level sensor 61; the first liquid level sensor 61 is arranged transversely along the slurry conveying direction inside the buffer component 2. This structure monitors the liquid level of the slurry inside the buffer component 2 in real time through the first liquid level sensor 61; when the liquid level is constantly rising, it indicates that there is a blockage in the reflux recovery process, requiring temporary suspension of conveying and inspection of the filter component or buffer component, etc.; thereby improving the stability and orderliness of the reflux recovery filtration.
[0034] Specifically, in some implementations, such as Figure 2 and 3 As shown, the buffer component 2 is equipped with an input pipe 21 and an output pipe 22; the input pipe 21 is connected to the reflux collection container 1; the output pipe 22 is connected to the filter component 3; the input pipe 21 is located at the upper end of the buffer component 2; the output pipe 22 is located at the lower end of the buffer component 2; and the slurry flow direction of the input pipe 21 and the slurry flow direction of the output pipe 22 are misaligned or partially overlapped. In other words, the misalignment and partial overlap of the input pipe 21 and the output pipe 22 helps to further slow down the slurry conveying speed, improve the buffering effect, and thus improve the stability and orderliness of the reflux recovery filtration.
[0035] Specifically, in some implementations, such as Figure 3As shown, the inner wall of the buffer component 2 near the output pipe 22 is provided with a guide slope 23; the angle between the guide slope 23 and the horizontal plane it is on is α, where α satisfies: 20°≤α≤75°. Preferably, it is 45°. This structure can ensure the conveying speed through the guiding effect of a suitable tilt angle; it avoids excessive speed due to an excessively large angle, thus reducing the buffering effect; at the same time, it avoids the residual effect of slurry due to an excessively small angle, thus causing waste.
[0036] Specifically, in some implementations, such as Figure 1 and 2 As shown, a second liquid level sensor 11 is installed inside the reflux collection container 1. This structure, by monitoring the liquid level of the slurry in the reflux collection container 1 using the second liquid level sensor 11 and combining the monitoring data from the first liquid level sensor 61 inside the buffer component 2, can determine whether the reflux collection container 1 or the buffer component 2 is blocked, thereby improving the accuracy of inspection and maintenance.
[0037] Specifically, in some implementations, such as Figure 1 and 2 As shown, a third liquid level sensor 51 is installed on the inner wall of the feeding container 5. This structure, by monitoring the liquid level of the slurry in the return collection container 1 using the second liquid level sensor 11, combined with the monitoring data from the first liquid level sensor 61 in the buffer component 2 and the monitoring data from the feeding container 5, can determine whether there is a blockage in the return collection container 1, the buffer component 2, or the pumping component 4, thereby improving the accuracy of inspection and maintenance.
[0038] Specifically, in some implementations, such as Figure 1 and 2 As shown, the filter element 3 includes a protective shell 31 and a filter screen 32 connected inside the protective shell 31; the upper end of the protective shell 31 is connected to the buffer element 2; and the lower end of the protective shell 31 is connected to the liquid extraction element 4. In some embodiments, the filter screen 32 has a mesh size of at least 50 mesh. This structure, using a filter screen with a mesh size of at least 50 mesh, can filter slurries that form particles or agglomerates, preventing agglomerates or large particles from being re-coated onto the diaphragm surface and causing scratches, thus improving the stability and orderliness of the reflux filtration; it also improves the yield of diaphragm coating and enables the reuse of slurry, reducing production costs.
[0039] Specifically, in some implementations, such as Figure 2 and 4As shown, the protective shell 31 includes an upper shell 311 and a lower shell 312 that are side-by-side and detachably connected to each other; a filter cavity is provided between the upper shell 311 and the lower shell 312; the filter cavity is connected to the buffer component 2; the filter cavity is connected to the liquid extraction component 4; the filter screen 32 is disposed inside the filter cavity and is detachably connected to the inside of the lower shell 312. The upper shell 311 and the lower shell 312 are detachably connected as one unit by threads or bolts. This structure, with its split upper and lower shell design, improves the ease of disassembly and maintenance of the filter screen 32 and enhances filtration efficiency.
[0040] Specifically, in some implementations, such as Figure 2 and 4 As shown, the filter body 32 includes a support ring 322 and a mesh body 321 connected inside the support ring 322; the support ring 322 is detachably connected to the interior of the lower housing 312; and the mesh body 321 is arranged perpendicular to the conduction direction of the filter cavity. Wherein, as... Figure 4 As shown, the lower housing 312 has an inner extending edge 314 inside; a support ring 322 is supported and connected to one end of the inner extending edge 314, facing the slurry flow direction of the upper housing 311. That is, the support of the inner extending edge 314 prevents collapse during the reflux recovery filtration process, thereby improving filtration stability and ensuring filtration efficiency. Furthermore, as... Figure 4 As shown, the inner extension edge 314 has at least one mounting groove 313 on the side facing the support ring 322; the support ring 322 has a limiting protrusion 323 corresponding to the mounting groove 313 on the side facing the limiting protrusion 323. That is, the outer wall of the limiting protrusion 323 is tightly attached to the inner wall of the mounting groove 313.
[0041] Specifically, in some implementations, such as Figure 5 As shown, the coating slurry return filtration device also includes a feeding pump 7, a material box 9, and a coating roller 8; the input end of the feeding pump 7 is connected to the interior of the feeding container 5; the output end of the feeding pump 7 is connected to the material box 9; the material box 9 is connected to the coating roller 8; and the coating roller 8 is positioned directly above the return collection container 1. The coating roller 8 is a gravure roller. The material box 9 of the gravure roller is called a doctor blade material box. The doctor blade material box is a component of the gravure coating machine, used to load and distribute coating material onto the gravure anilox roller. It is usually made of corrosion-resistant material and has a certain sealing performance to reduce coating leakage. The design of the doctor blade material box allows the coating material to fully contact the gravure anilox roller, thereby making the coating process more uniform and stable. The gravure roller is a miniature gravure coating roller or a ceramic roller.
[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0043] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.
Claims
1. A coating slurry reflow filtration apparatus, characterized by: The device comprises a backflow collecting container, a buffer component, a filtering component, a liquid pumping component and a feeding container; the output end of the backflow collecting container is in communication with the interior of the buffer component; a liquid sensing component is arranged in the buffer component; the input end of the filtering component is in communication with the interior of the buffer component; the output end of the filtering component is in communication with the input end of the liquid pumping component; the output end of the liquid pumping component is in communication with the interior of the feeding container.
2. The coating slurry reflow filtration apparatus of claim 1, wherein: The liquid sensing component is a first liquid level sensor; the first liquid level sensor is arranged across the slurry conveying direction of the interior of the buffer component.
3. The apparatus of claim 1, wherein: The buffer component is provided with an input pipe and an output pipe; the input pipe is in communication with the backflow collecting container; the output pipe is in communication with the filtering component; the input pipe is arranged at the upper end of the buffer component; the output pipe is arranged at the lower end of the buffer component; The slurry flow direction of the input pipe is staggered with or partially overlapped with the slurry flow direction of the output pipe.
4. The apparatus of claim 3, wherein: The buffer component is provided with a flow guiding inclined surface close to the inner side wall of the output pipe; the included angle between the flow guiding inclined surface and the horizontal plane where it is located is α, and α satisfies: 20°≤α≤75°.
5. The apparatus of claim 1, wherein: The interior of the backflow collecting container is provided with a second liquid level sensor; And / or, the inner wall of the feeding container is provided with a third liquid level sensor.
6. The coating slurry reflow filtration apparatus of claim 1, wherein: The coating slurry backflow filtering device further comprises a feeding pump, a material box and a coating roller; the input end of the feeding pump is in communication with the interior of the feeding container; the output end of the feeding pump is in communication with the material box; the material box is in communication with the coating roller; and the coating roller is arranged directly above the backflow collecting container.
7. The apparatus of claim 1, wherein: The filtering component comprises a protective shell and a filtering mesh body connected to the interior of the protective shell; the upper end of the protective shell is in communication with the buffer component; the lower end of the protective shell is in communication with the liquid pumping component.
8. The apparatus of claim 7, wherein: The filtering mesh body has a filtering mesh number of at least 50 meshes.
9. The apparatus of claim 7 or 8, wherein: The protective shell comprises an upper shell body and a lower shell body connected to each other; and a filtering inner cavity is arranged between the upper shell body and the lower shell body; the filtering inner cavity is arranged in communication with the buffer component; the filtering inner cavity is arranged in communication with the liquid pumping component; the filtering mesh body is arranged in the interior of the filtering inner cavity, and the filtering mesh body is detachably connected to the interior of the lower shell body.
10. The apparatus of claim 9, wherein: The filtering mesh body comprises a supporting ring and a mesh body connected to the interior of the supporting ring; the supporting ring is detachably connected to the interior of the lower shell body; and the mesh body is arranged vertically to the communication direction of the filtering inner cavity.