Spraying device and diaphragm spraying system
Through innovative design of the spraying device and feeding unit, the problem of insufficient uniformity in diaphragm coating was solved, achieving a highly efficient and uniform diaphragm coating, thereby improving the performance and production efficiency of lithium batteries.
Patent Information
- Application Number
- CN202423216617.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-24
AI Technical Summary
The coating uniformity of existing lithium battery separators is insufficient, which affects the overall performance of the battery.
The spraying device, including a spraying turntable and a feeding unit, uses circumferentially distributed conical or spiral spray holes and a nano-coating, combined with a slurry monitoring sensor and a control unit, to achieve high-precision feeding and maintenance of the spraying path, reducing slurry splashing and waste.
It improves the coating uniformity of the diaphragm, reduces material waste, enhances coating quality and production efficiency, and lowers manufacturing costs.
Smart Images
Figure CN223931711U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery component production equipment technology, and more specifically, to a spraying device and a diaphragm spraying system. Background Technology
[0002] With the development of science and technology, lithium batteries have become the mainstream of power battery development, possessing advantages such as high specific energy, wide operating temperature range, and stable discharge. However, various safety hazards still exist during use, hindering their development. Safety is a crucial factor to consider for batteries, and the pore-closing temperature and rupture temperature of the separator are important indicators for ensuring the safety of lithium-ion batteries. Existing lithium batteries mainly consist of a positive electrode, a negative electrode, an electrolyte, and a separator. The main function of the separator is to separate the positive and negative electrodes, preventing direct contact and short circuits, and preventing electrons from passing through while allowing ions to pass through. The performance of the separator determines the battery's interface structure and internal resistance, thus affecting key characteristics such as capacity, cycle life, and charge / discharge current density. Therefore, the quality of the separator plays a vital role in improving the overall performance of the battery.
[0003] The coating effect of the diaphragm directly affects the performance of the diaphragm, and the coating uniformity of the diaphragm still needs to be improved. Utility Model Content
[0004] This application provides a spraying apparatus and a diaphragm spraying system that can improve the coating uniformity of the diaphragm.
[0005] In a first aspect, embodiments of this application provide a spraying device, which includes a spraying turntable and a material receiving chamber; the side wall of the spraying turntable is provided with spray holes, which communicate with the material receiving chamber and are circumferentially distributed.
[0006] In the above implementation process, by using circumferentially distributed channels as spray holes, the slurry can be sprayed evenly, thereby improving the coating uniformity of the diaphragm.
[0007] As an optional implementation, the spray nozzle is conical in shape.
[0008] In the above implementation process, by using conical channels as spray holes, the slurry can be sprayed more evenly, thereby improving the coating uniformity of the diaphragm.
[0009] As an optional implementation, the nozzles gradually decrease in size from the inside to the outside along the radial direction of the spraying turntable.
[0010] As an optional implementation, the centerline of the spray nozzle forms an angle with the radial direction of the spraying turntable.
[0011] In the above implementation process, by using channels distributed in a spiral pattern as spray holes, the spray angle is optimized, the spray dead angle is reduced, and the slurry can be sprayed more evenly, thereby further improving the coating uniformity of the diaphragm.
[0012] As an optional implementation, the sidewalls of the material cavity are provided with a nano-coating.
[0013] In the above implementation process, the application of nano-coatings can reduce adhesion to the slurry, thereby improving the utilization rate of the slurry.
[0014] As an optional implementation, the minimum diameter of the spray nozzle is 80μm to 120μm.
[0015] Secondly, embodiments of this application provide a diaphragm spraying system, the system including the spraying device provided in the first aspect.
[0016] As an optional implementation, the system further includes a feeding unit, which includes a feeding device and a feeding pipe, one end of which is connected to the feeding device and the other end of which is connected to the spraying device.
[0017] As an optional implementation, the feed pipe is equipped with a slurry monitoring sensor, and the system further includes a control unit, the slurry monitoring sensor being connected to the control unit, and the control unit being connected to the feed device.
[0018] In the above implementation process, the coordinated setup of the slurry monitoring sensor and control unit enables high-precision slurry feeding by the feeding unit, which helps maintain the spray path and thus improves the coating uniformity of the diaphragm. It also reduces slurry splashing and waste.
[0019] As an optional implementation, the system further includes a drive device, the output of which is connected to the spraying device; the control unit is connected to the drive device.
[0020] In the above implementation process, the coordinated design of the drive device and control unit enables the matching of the material supply and the rotation speed of the spraying turntable, which is beneficial for maintaining the spraying path and thus improving the coating uniformity of the diaphragm. It also reduces slurry splashing and waste.
[0021] As an optional implementation, the feed pipe is equipped with a flow control valve, and the control unit is connected to the flow control valve.
[0022] In the above implementation process, the coordinated design of the flow control valve and control unit enables high-precision feeding of the feeding unit, which helps maintain the spray path and thus improves the coating uniformity of the diaphragm. It also reduces slurry splashing and waste.
[0023] As an optional implementation, the feed pipe is connected to the spraying turntable, and the connection between the feed pipe and the spraying turntable is located at the central axis of the spraying turntable.
[0024] In the above implementation process, by setting the connection between the feed pipe and the spraying turntable at the center of the spraying turntable, it is beneficial for the slurry to reach the spraying holes at all parts of the spraying turntable evenly, which is beneficial for the uniformity of coating.
[0025] As an optional implementation, the system further includes a slurry recovery unit disposed at the lower end of the spraying turntable.
[0026] In the above implementation process, the slurry recovery unit can be set up to collect the slurry that is not attached to the diaphragm, so as to realize the recycling of the slurry and reduce the preparation cost.
[0027] As an optional implementation, the power unit of the feeding device is a gear pump or a peristaltic pump.
[0028] As an optional implementation, the spraying turntable is made of metal; and / or
[0029] The material of the feed pipe is a corrosion-resistant material. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the system structure provided in the embodiments of this application;
[0032] Figure 2 This is a schematic diagram of the spraying turntable structure provided in an embodiment of this application;
[0033] Figure 3 This is a cross-sectional view of the spraying turntable provided in an embodiment of this application.
[0034] Reference numerals: 1-Spraying device; 11-Spraying turntable; 111-Material chamber; 111a-Nano coating; 112-Spraying nozzle; 12-Drive device; 2-Feeding unit; 21-Feeding device; 22-Feeding pipe; 221-Slurry monitoring sensor; 222-Flow control valve; 3-Slurry recovery unit. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0036] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for 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. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0037] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0038] Figure 1 This is a schematic diagram of the system structure provided in the embodiments of this application, such as... Figure 1 As shown in the figure, this application provides a diaphragm spraying system, the system comprising: a spraying device 1 for spraying slurry onto a diaphragm and a feeding unit 2 for supplying the spraying slurry to the spraying device 1; the spraying device 1 includes a spraying turntable 11 and a material receiving chamber 111. Figure 2 and Figure 3 These are schematic diagrams of the spraying turntable structure provided in the embodiments of this application, as follows: Figure 2 and Figure 3As shown, the side wall of the spraying turntable 11 is provided with spray holes 112, the spray holes 112 are connected to the material receiving cavity 111, the spray holes 112 are circumferentially distributed, and the axis of the circumferentially distributed spray holes 112 coincides with the central axis of the spraying turntable 11; the feeding unit 2 includes a feeding device 21 and a feeding pipe 22, one end of the feeding pipe 22 is connected to the feeding device 21, and the other end of the feeding pipe 22 is connected to the spraying turntable 11.
[0039] The principle of this system for spraying is to use centrifugal force to uniformly spray the slurry onto the target surface. Specifically, the slurry is fed into the material chamber 111 of the high-speed rotating spraying turntable 11 through the feeding unit 2. Under the action of centrifugal force, the slurry flows from the center outward and is uniformly sprayed out through the spraying hole 112 to form a uniform coating.
[0040] The system uses circumferentially distributed channels as spray holes 112, which enables the slurry to be sprayed evenly, thereby improving the coating uniformity of the diaphragm.
[0041] Typically, the connection between the feed pipe 22 and the spraying turntable is located at the central axis of the spraying turntable. By placing the connection between the feed pipe 22 and the spraying turntable at the center of the spraying turntable, it is beneficial for the slurry to reach the spray holes 112 at all points on the spraying turntable evenly, thus improving the uniformity of the coating. Verification has shown that the thickness uniformity error of the diaphragm coating is less than 5%, significantly improving the coating quality.
[0042] The spraying turntable can consist of multiple parallel turntables, with dimensions of approximately 10–30 cm in diameter and 5–15 mm in thickness, and a spacing of approximately 10–30 cm between the turntables. The number of spray nozzles 112 distributed on the sidewall of the spraying turntable is 10–30 per square centimeter. The spraying turntable is typically made of high-strength, corrosion-resistant materials, such as high-strength, corrosion-resistant alloys (e.g., stainless steel or titanium alloys), to ensure its stability and durability during high-speed rotation. The feed pipe 22 is also made of corrosion-resistant materials (e.g., Teflon tubing). The power unit of the feed device 21 can be selected from a high-precision gear pump or a peristaltic pump.
[0043] In some embodiments, the nozzle 112 is conical.
[0044] By using cone-shaped channels as spray holes 112, the slurry can be sprayed more evenly, thereby improving the coating uniformity of the diaphragm.
[0045] In some embodiments, the size gradually decreases from the inside to the outside along the radial direction of the spraying turntable 11.
[0046] In some embodiments, the centerline of the nozzle 112 forms an angle with the radial direction of the spraying turntable 11. That is, the nozzles 112 are spirally distributed on the projected surface. By using a spirally distributed array of nozzles 112, the spray angle is optimized, the spray dead zone is reduced, and the slurry can be sprayed more evenly, thereby further improving the coating uniformity of the diaphragm.
[0047] In some embodiments, the feed pipe 22 is provided with a slurry monitoring sensor 221, and the system further includes a control unit. The slurry monitoring sensor 221 is connected to the control unit to transmit slurry flow rate data and pressure data to the control unit. The control unit is connected to the feed device 21 to output control signals to the feed device 21 based on the slurry flow rate data and pressure data to adjust the working state.
[0048] Furthermore, the feed pipe 22 is provided with a flow control valve 222, and the control unit is connected to the flow control valve 222 to output a control signal to the drive device 12 to adjust the working state.
[0049] By coordinating the slurry monitoring sensor 221 and the control unit, high-precision slurry feeding is achieved in the feeding unit 2, which helps maintain the spray path and thus improves the coating uniformity of the diaphragm. It also reduces slurry splashing and waste.
[0050] In some embodiments, the system further includes a drive unit, the output of which is connected to the spraying device; the control unit is connected to the drive unit 12 and outputs control signals to the drive unit 12 to adjust the working state. Through the coordinated arrangement of the drive unit 12 and the control unit, the material supply and the rotation speed of the spraying turntable can be matched, which is beneficial for maintaining the spray path and thus improving the coating uniformity of the diaphragm. It also reduces slurry splashing and waste.
[0051] In some embodiments, the system further includes a slurry recovery unit 3, which is disposed at the lower end of the spraying turntable 11 to receive slurry that is not attached to the diaphragm. The slurry recovery unit 3 allows for the collection of slurry that is not attached to the diaphragm, enabling slurry recycling and reducing preparation costs.
[0052] In some embodiments, the sidewall of the material container 111 is provided with a nano-coating 111a. The nano-coating 111a reduces the adhesion of the slurry, thereby improving the utilization rate of the slurry.
[0053] In some embodiments, the system further includes a coating detection sensor for monitoring the coating thickness and spraying status. The coating detection sensor is connected to a control unit to transmit coating thickness data and spraying status data to the control unit. The control unit can output control signals to the drive device 12 based on the coating thickness data and spraying status data to adjust the operating status.
[0054] The entire system operates as follows:
[0055] 1) Preparation:
[0056] Preparation of spraying slurry: Place the spraying slurry in the spraying slurry storage container of the supply unit 2, and ensure that the viscosity and ratio of the spraying slurry meet the spraying requirements.
[0057] Separator preparation: Fix the lithium battery separator to be coated in the spraying area, ensuring that its surface is clean and flat.
[0058] 2) Start the equipment:
[0059] Feeding unit 2 start-up: Start the power unit of feeding unit 2 to deliver the spraying slurry through the feeding pipe 22 to the center position of the spraying turntable 11. The flow control valve 222 precisely adjusts the flow rate of the spraying slurry to ensure a stable supply.
[0060] Start the drive unit 12: Start the drive unit 12 of the spraying device 1 to make the spraying turntable 11 start to rotate, with the initial speed set to 1500 rpm.
[0061] Under centrifugal force, the spray slurry flows outward from the center of the spraying turntable 11 and is evenly sprayed through the spray nozzles 112. Due to the spiral arrangement and conical design of the spray nozzles 112, the spray slurry can be evenly distributed on the surface of the turntable, forming uniform spray points. During the spraying process, the slurry monitoring sensor 221 monitors the flow rate and pressure of the spray slurry in real time to ensure the stability of the spraying process. Based on the feedback data from the slurry monitoring sensor 221, the control unit automatically adjusts the rotation speed of the spraying turntable 11 and the spray slurry supply to ensure uniform coating thickness. Based on the coating thickness data fed back by the coating detection sensor, the control unit automatically adjusts the rotation speed of the spraying turntable 11 and the spray slurry flow rate. For example, when a coating thickness deviation is detected, the control unit will increase or decrease the spray slurry supply or adjust the rotation speed of the spraying turntable 11 to achieve a uniform coating effect. Simultaneously, during the spraying process, the operator can periodically check the spraying effect to ensure coating quality. If any abnormality is found, the equipment parameters can be manually adjusted or spraying can be paused for inspection. During the spraying process, any spray slurry that fails to evenly cover the diaphragm will splash into the slurry recovery unit 3 below the equipment. The collected slurry can be reused in the spray slurry supply system, further improving the slurry utilization rate. After spraying is complete, the rotation speed of the spraying turntable 11 is gradually reduced to a stop, and the supply unit 2 and drive device 12 are shut off. The micro-hole turntable and supply system can be cleaned periodically to ensure normal equipment operation and effective spraying.
[0062] Using the spraying system provided in this application embodiment, the coating thickness uniformity error after spraying is less than 5%, ensuring the performance and quality of the lithium battery separator. Furthermore, the utilization rate of the spraying slurry is significantly improved, reducing material waste. Spraying efficiency is increased by 20%, improving production efficiency and reducing costs.
[0063] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.
[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A spraying device, characterized in that, The spraying device includes a spraying turntable and a material receiving chamber; the side wall of the spraying turntable is provided with spray holes, the spray holes are connected to the material receiving chamber, and the spray holes are circumferentially distributed; the spray holes are conical in shape.
2. The spraying apparatus according to claim 1, characterized in that, The nozzles gradually decrease in size from the inside to the outside along the radial direction of the spraying turntable.
3. The spraying apparatus according to claim 1, characterized in that, The centerline of the spray nozzle forms an angle with the radial direction of the spraying turntable.
4. The spraying apparatus according to claim 1, characterized in that, The sidewalls of the material cavity are coated with a nano-coating.
5. The spraying apparatus according to claim 1, characterized in that, The minimum diameter of the spray nozzle is 80μm~120μm.
6. A diaphragm spraying system, characterized in that, The system includes the spraying apparatus according to any one of claims 1 to 5.
7. The diaphragm spraying system according to claim 6, characterized in that, The system also includes a material feeding unit, which includes a material feeding device and a material feeding pipe. One end of the material feeding pipe is connected to the material feeding device, and the other end of the material feeding pipe is connected to the spraying device.
8. The diaphragm spraying system according to claim 7, characterized in that, The feeding pipe is equipped with a slurry monitoring sensor, and the system also includes a control unit. The slurry monitoring sensor is connected to the control unit, and the control unit is connected to the feeding device.
9. The diaphragm spraying system according to claim 8, characterized in that, The system also includes a drive unit, the output of which is connected to the spraying device; the control unit is connected to the drive unit.
10. The diaphragm spraying system according to claim 8, characterized in that, The feed pipe is equipped with a flow control valve, and the control unit is connected to the flow control valve.
11. The diaphragm spraying system according to claim 8, characterized in that, The feed pipe is connected to the spraying turntable, and the connection between the feed pipe and the spraying turntable is located at the central axis of the spraying turntable.
12. The diaphragm spraying system according to claim 6, characterized in that, The system also includes a slurry recovery unit, which is located at the lower end of the spraying device.