Solid electrolyte coating system for preventing non-woven fabric from wrinkling and bubbling
By laying a substrate on a nonwoven fabric and applying pressure to bond it, combined with ultrasonic cleaning, the problems of wrinkling and bubbling in the nonwoven fabric during the coating process were solved, achieving uniform coating and efficient production of solid electrolyte membranes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI FIRM LITHIUM NEW ENERGY TECH CO LTD
- Filing Date
- 2026-02-05
- Publication Date
- 2026-05-12
AI Technical Summary
Non-woven fabrics are prone to wrinkling due to tension before coating, resulting in uneven coating and bubbling, which affects the production efficiency and yield of electrolyte membranes.
The coating system consists of a substrate roll, a gravure printing machine, a nonwoven fabric roll, a pressure roller, a film-tearing roller, an electrolyte coating machine, and a cleaning tank. By laying the substrate on the nonwoven fabric and applying pressure to bond it, the nonwoven fabric and the substrate are ensured to be tightly bonded. An ultrasonic cleaning device is used to remove residual air and prevent wrinkles and bubbles.
This achieves a tight bond between the nonwoven fabric and the substrate, avoiding wrinkling and bubbling issues, ensuring uniform coating of the solid electrolyte slurry, improving the production efficiency and yield of the electrolyte membrane, and reducing production costs.
Smart Images
Figure CN224221807U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of solid-state battery technology, specifically to a solid electrolyte coating system for preventing wrinkles and bubbles in non-woven fabrics. Background Technology
[0002] As the core energy transmission channel of a battery, the performance of the electrolyte membrane directly determines the battery's energy density, safety, cycle life, and operating temperature range. It is a key material that restricts the iteration of solid-state battery technology.
[0003] A Chinese patent with publication number CN109935893A discloses a solid electrolyte membrane composed of a strip of nonwoven fabric and a polymer solid electrolyte. The surface of the nonwoven fabric is coated with the polymer solid electrolyte.
[0004] However, in actual production, it is found that before entering the coating device, the non-woven fabric is very thin due to the long transmission distance. It is easy to wrinkle due to tension. After the non-woven fabric is bonded to the substrate, it is easy to cause bubbles due to residual air. As a result, the non-woven fabric cannot maintain a flat state after entering the coating device, which leads to uneven coating of solid electrolyte slurry and a decrease in the yield of electrolyte membrane.
[0005] Therefore, there is a need for a solid electrolyte coating system that prevents nonwoven fabric from wrinkling and bubbling, thereby solving the problems of wrinkling and bubbling in nonwoven fabric and improving the production efficiency of electrolyte membranes. Summary of the Invention
[0006] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a solid electrolyte coating system for preventing nonwoven fabrics from wrinkling and bubbling.
[0007] According to the present invention, a solid electrolyte coating system for preventing wrinkles and bubbles in nonwoven fabric is provided, comprising: a substrate roll, a gravure printing machine, a nonwoven fabric roll, a second substrate roll, a pressure roller, a film-tearing roller, an electrolyte coating machine, a cleaning tank, a second substrate winding device, and a solid electrolyte membrane winding device.
[0008] The output end of the substrate roll is connected to the input end of the gravure printing machine. The solid electrolyte slurry is coated onto the substrate output from the substrate roll by the gravure printing machine to form a slurry-coated substrate. The second substrate output from the second substrate roll, the nonwoven fabric output from the nonwoven fabric roll, and the slurry-coated substrate are arranged sequentially from top to bottom, and the three are pressed together by pressure rollers to form a three-layer adhesive. The output end of the pressure roller is connected to the input end of the film-tearing roller. The output end of the film-tearing roller is connected to the input ends of both the electrolyte coating machine and the cleaning tank. The second substrate at the top is separated from the nonwoven fabric by the film-tearing roller. The second substrate is conveyed to the cleaning tank. The adhesive formed by the substrate and the nonwoven fabric is conveyed to the input end of the electrolyte coating machine. The output end of the electrolyte coating machine is connected to the input end of the solid electrolyte membrane winding device. The output end of the cleaning tank is connected to the input end of the second substrate winding device.
[0009] Preferably, the substrate of the substrate roll includes release paper and PET film, and the solid electrolyte slurry is coated on the upper surface of the substrate by gravure printing.
[0010] Preferably, a correction device is provided on the movement paths of the second substrate output from the second substrate roll, the nonwoven fabric output from the nonwoven fabric roll, and the substrate with slurry.
[0011] Preferably, the thickness of the solid electrolyte slurry coated by the gravure printing machine does not exceed 5 μm, the coating range of the solid electrolyte slurry matches the nonwoven fabric, and the width of the second substrate matches the width of the substrate.
[0012] Preferably, the electrolyte coating machine includes a coating device and a drying device arranged in sequence. The solid electrolyte slurry is coated onto the nonwoven fabric by the coating device, and the solid electrolyte slurry and the nonwoven fabric are dried by the drying device to form a solid electrolyte film.
[0013] Preferably, the cleaning tank is provided with a back roller and an ultrasonic cleaning device, and the side of the second substrate away from the nonwoven fabric is wound around the back roller.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. This utility model uses a layer of solid electrolyte slurry to bond the nonwoven fabric and the substrate, which ensures that the nonwoven fabric can be completely bonded to the substrate during the transportation process. This avoids problems such as wrinkles caused by tension and bubbles caused by air residue. Moreover, the solid electrolyte slurry laid in this step is exactly the same as the solid electrolyte slurry coated by the electrolyte coating machine. There is no need to worry about other materials contaminating the solid electrolyte membrane. It also avoids the situation where the solid electrolyte slurry cannot penetrate the nonwoven fabric, thereby improving the production efficiency of the electrolyte membrane.
[0016] 2. This utility model uses a second substrate laid on a nonwoven fabric. A pressure roller applies pressure to the three-layer structure consisting of the second substrate, nonwoven fabric, and substrate. The second substrate prevents solid electrolyte slurry from overflowing and contaminating the pressure roller, while the pressure roller expels any residual air, ensuring a tight bond between the nonwoven fabric and the substrate. This guarantees that the solid electrolyte slurry is evenly coated on the nonwoven fabric, preventing waste of electrolyte slurry and defective electrolyte membranes due to nonwoven fabric issues. The system has a simple structure, is easy to operate, has low production costs, and a high yield, thus improving production efficiency. Attached Figure Description
[0017] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0018] Figure 1 This is a schematic diagram of the structure of a solid electrolyte coating system for preventing wrinkles and bubbles in nonwoven fabrics, which is the main feature of this utility model.
[0019] Reference numerals: 1. Substrate roll; 2. Gravure printing machine; 3. Nonwoven fabric roll; 4. Second substrate roll; 5. Pressure roller; 6. Film tearing roller; 7. Electrolyte coating machine; 8. Cleaning tank; 9. Second substrate winding device; 10. Solid electrolyte membrane winding device. Detailed Implementation
[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.
[0021] like Figure 1As shown, a solid electrolyte coating system for preventing wrinkles and bubbles in nonwoven fabrics according to this utility model includes: a substrate roll 1, a gravure printing machine 2, a nonwoven fabric roll 3, a second substrate roll 4, a pressure roller 5, a film-tearing roller 6, an electrolyte coating machine 7, a cleaning tank 8, a second substrate winding device 9, and a solid electrolyte membrane winding device 10; the output end of the substrate roll 1 is connected to the input end of the gravure printing machine 2, and the solid electrolyte slurry is coated onto the substrate output from the substrate roll 1 by the gravure printing machine 2 to form a slurry-coated substrate, the second substrate output from the second substrate roll 4, the nonwoven fabric output from the nonwoven fabric roll 3, and the slurry-coated substrate. The three components are arranged sequentially from top to bottom and are bonded together by pressure roller 5 to form a three-layer adhesive. The output end of pressure roller 5 is connected to the input end of film-tearing roller 6. The output end of film-tearing roller 6 is connected to the input ends of electrolyte coating machine 7 and cleaning tank 8, respectively. The second substrate at the top is separated from the nonwoven fabric by film-tearing roller 6 and conveyed to cleaning tank 8. The adhesive formed by the substrate and nonwoven fabric is conveyed to the input end of electrolyte coating machine 7. The output end of electrolyte coating machine 7 is connected to the input end of solid electrolyte membrane winding device 10, and the output end of cleaning tank 8 is connected to the input end of second substrate winding device 9.
[0022] The substrate roll 1 comprises release paper and PET film. Solid electrolyte slurry is coated onto the upper surface of the substrate using a gravure printing machine 2. The solid electrolyte slurry coated by the gravure printing machine 2 only needs to act as an adhesive; only a thin layer of solid electrolyte slurry is required, and it must not penetrate the non-woven fabric to avoid affecting the thickness of the solid electrolyte slurry coated by the subsequent electrolyte coating machine 7. Therefore, using the gravure printing machine 2 is a good choice. By storing pressure-sensitive adhesive in the cells of the gravure printing machine 2 and then smoothing it with a squeegee, the amount of coating can be precisely controlled, and the coating is uniform. The thickness of the solid electrolyte slurry coated by the gravure printing machine 2 does not exceed 5µm, and the coating area of the solid electrolyte slurry matches the width of the non-woven fabric and the second substrate.
[0023] However, in practical applications, it has been found that even a very thin layer of solid electrolyte slurry may overflow when the substrate and nonwoven fabric are bonded under pressure by the pressure roller 5, causing contamination of the pressure roller 5. Therefore, it is necessary to add another layer on the nonwoven fabric to prevent the solid electrolyte slurry from contacting the pressure roller 5. In this application, an additional substrate layer is added to the nonwoven fabric. This substrate layer only participates in the pressure roller 5 process and can be recycled and reused by the film-tearing roller 6, thereby reducing production costs.
[0024] The cleaning tank 8 is equipped with a back roller and an ultrasonic cleaning device. The side of the second substrate away from the nonwoven fabric is wound around the back roller. The ultrasonic cleaning device can directly clean the second substrate, thereby enabling the substrate to be recycled and reused.
[0025] Furthermore, the second substrate output from the second substrate roll 4, the nonwoven fabric output from the nonwoven fabric roll 3, and the movement paths of the substrate with slurry are all equipped with correction devices. These correction devices ensure that the nonwoven fabric is accurately laid within the solid electrolyte slurry coating area of the substrate with slurry, and also ensure that the second substrate completely covers both sides of the nonwoven fabric, thereby blocking any overflowing solid electrolyte slurry and preventing contamination of the pressure roller 5.
[0026] The electrolyte coating machine 7 includes a coating device and a drying device arranged in sequence. The solid electrolyte slurry is coated onto the nonwoven fabric through the coating device, and the solid electrolyte slurry and the nonwoven fabric are dried by the drying device to form a solid electrolyte film.
[0027] The operation process of this application is as follows: Substrate roll 1 outputs substrate to the input end of gravure printing machine 2. The gravure printing machine 2 coats a uniform solid electrolyte slurry on the upper surface of the substrate to form a substrate with slurry. Nonwoven fabric output from nonwoven fabric roll 3 is laid on the upper surface of the substrate with slurry. The second substrate output from second substrate roll 4 is laid on the nonwoven fabric. Pressure is applied by pressure roller 5 to form a three-layer adhesive. Then, the second substrate is separated from the nonwoven fabric by film tearing roller 6. The second substrate is sent to cleaning tank 8 for cleaning and then wound up by second substrate winding device 9 for recycling. The nonwoven fabric is tightly adhered to the substrate and sent to the input end of electrolyte coating machine 7. Solid electrolyte slurry is coated on the nonwoven fabric by coating device. Solid electrolyte slurry and nonwoven fabric are dried by drying device to form solid electrolyte film. It can be directly sent to solid electrolyte film winding device 10 for winding and transferred to other processes for the next step. Alternatively, a film tearing roller can be added to separate the solid electrolyte film from the substrate, and only the solid electrolyte film is wound up and transferred to other processes for the next step.
[0028] This application uses a method of first laying a layer of solid electrolyte slurry to bond the nonwoven fabric and the substrate. This ensures that the nonwoven fabric can be completely bonded to the substrate during the transportation process, avoiding problems such as wrinkles caused by tension and bubbles caused by air residue. Moreover, the solid electrolyte slurry laid in this step is exactly the same as the solid electrolyte slurry coated by the electrolyte coating machine 7, so there is no need to worry about other materials contaminating the solid electrolyte membrane. It also avoids the situation where the solid electrolyte slurry cannot penetrate the nonwoven fabric, thereby improving the production efficiency of the electrolyte membrane.
[0029] Furthermore, this application employs a second substrate laid on the nonwoven fabric. A pressure roller 5 applies pressure to the three-layer structure consisting of the second substrate, nonwoven fabric, and substrate. The second substrate prevents solid electrolyte slurry from overflowing and contaminating the pressure roller 5, while the pressure roller 5 expels any residual air, ensuring a tight bond between the nonwoven fabric and the substrate. This guarantees that the solid electrolyte slurry is uniformly coated on the nonwoven fabric, preventing waste of electrolyte slurry and defective electrolyte membranes due to nonwoven fabric issues. The system structure of this application is simple, easy to operate, has low production costs, and a high yield, thus improving production efficiency.
[0030] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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 application.
[0031] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.
Claims
1. A solid electrolyte coating system for preventing wrinkling and bubbling in nonwoven fabrics, characterized in that, include: Substrate roll (1), gravure printing machine (2), non-woven fabric roll (3), second substrate roll (4), pressure roller (5), film tearing roller (6), electrolyte coating machine (7), cleaning tank (8), second substrate winding device (9), and solid electrolyte membrane winding device (10). The output end of the substrate roll (1) is connected to the input end of the gravure printing machine (2). The solid electrolyte slurry is coated onto the substrate output from the substrate roll (1) by the gravure printing machine (2) to form a slurry-coated substrate. The second substrate output from the second substrate roll (4), the nonwoven fabric output from the nonwoven fabric roll (3), and the slurry-coated substrate are arranged sequentially from top to bottom, and the three are pressed together by the pressure roller (5) to form a three-layer adhesive. The output end of the pressure roller (5) is connected to the input end of the film-tearing roller (6). The output ends are connected to the input ends of the electrolyte coating machine (7) and the cleaning tank (8), respectively. The second substrate located at the top is separated from the nonwoven fabric by the film tearing roller (6). The second substrate is conveyed to the cleaning tank (8). The adhesive formed by the substrate and the nonwoven fabric is conveyed to the input end of the electrolyte coating machine (7). The output end of the electrolyte coating machine (7) is connected to the input end of the solid electrolyte membrane winding device (10). The output end of the cleaning tank (8) is connected to the input end of the second substrate winding device (9).
2. The solid electrolyte coating system for preventing wrinkling and bubbling of nonwoven fabrics as described in claim 1, characterized in that, The substrate of the substrate roll (1) includes release paper and PET film, and the solid electrolyte slurry is coated on the upper surface of the substrate by a gravure printing machine (2).
3. The solid electrolyte coating system for preventing wrinkling and bubbling of nonwoven fabrics as described in claim 2, characterized in that, Correction devices are provided on the movement paths of the second substrate output from the second substrate roll (4), the nonwoven fabric output from the nonwoven fabric roll (3), and the substrate with slurry.
4. The solid electrolyte coating system for preventing wrinkling and bubbling of nonwoven fabrics as described in claim 3, characterized in that, The thickness of the solid electrolyte slurry coated by the gravure printing machine (2) does not exceed 5 μm, the coating range of the solid electrolyte slurry matches the nonwoven fabric, and the width of the second substrate matches the width of the substrate.
5. The solid electrolyte coating system for preventing wrinkling and bubbling of nonwoven fabrics as described in claim 1, characterized in that, The electrolyte coating machine (7) includes a coating device and a drying device arranged in sequence. The solid electrolyte slurry is coated onto the nonwoven fabric by the coating device, and the solid electrolyte slurry and the nonwoven fabric are dried by the drying device to form a solid electrolyte film.
6. The solid electrolyte coating system for preventing wrinkling and bubbling of nonwoven fabrics as described in claim 1, characterized in that, The cleaning tank (8) is equipped with a back roller and an ultrasonic cleaning device, and the side of the second substrate away from the nonwoven fabric is wrapped around the back roller.