Double-sided electrostatic spraying device for lithium battery diaphragm

Abstract

The utility model belongs to the technical field of electrostatic spraying, and particularly relates to a double-sided electrostatic spraying device for a lithium battery diaphragm. Comprising a feeding roller used for introducing the movable end of a diaphragm to be modified into a spraying chamber; the conveying device comprises a face A spraying driving roller, a face B spraying driving roller and a driving motor and is used for providing rotating power to enable the diaphragm to transversely move in the specific direction; the spraying device comprises an A-side spraying device, an A-side spraying collecting plate, a B-side spraying device and a B-side spraying collecting plate which are respectively positioned in an A-side spraying area and a B-side spraying area to form a high-voltage electric field; and the discharging roller is positioned behind the spraying device and is used for conveying the modified diaphragm out of the spraying chamber. The device drives the driving roller to rotate through the driving motor, so that the diaphragm transversely moves, and meanwhile, electrostatic spraying is performed on the A surface. And then, after the diaphragm is dried by a drying oven and residual charges are removed, the diaphragm enters a B-surface spraying area through a deviation rectifying device, and B-surface electrostatic spraying is carried out. And finally, collecting the electrostatic spraying double-sided modified diaphragm through a discharging roller.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrostatic spraying, and in particular relates to a double-sided electrostatic spraying device for lithium battery separators. Background Art

[0002] With the increasing shortage of fossil energy and environmental pollution, research on new clean energy sources is becoming increasingly important. As an important storage device for electrical energy, lithium batteries are increasingly in demand with the development of consumer electronics and electric vehicles. As a crucial component of lithium batteries, the diaphragm not only physically isolates the positive and negative electrodes from contact but also provides a pathway for lithium ion transmission, playing a crucial role. Currently, most commercial diaphragms are PP and PE. However, polyolefin diaphragms have drawbacks such as poor thermal stability and insufficient electrolyte wettability. Modification of diaphragms is an important approach to improving lithium battery performance.

[0003] Traditional membrane materials are mostly surface-modified using physical methods, such as comma blade coating, slot die coating, and rotary spraying. While these methods improve the membrane's thermal affinity, mechanical strength, and thermal stability to a certain extent, they still present numerous challenges: coating uniformity is difficult to control, the treated membrane is susceptible to environmental influences, leading to performance degradation, and production efficiency is low.

[0004] In recent years, electrostatic spraying technology has been increasingly used for surface modification of separators due to its advantages of fast spraying speed, uniform coating, and continuous operation. Electrostatic spraying forms a nanoscale polymer film on the separator surface, significantly improving the separator's physical and chemical properties while maintaining good air permeability and porosity.

[0005] However, the traditional double-sided coating equipment currently used in the coating industry has difficulty achieving precise control of coating uniformity when coating double-sided separators. This is because during the coating process, the separator's own weight causes uneven vertical stretching, which affects the coating uniformity and, in turn, the performance of the entire battery. Utility Model Content

[0006] (1) Technical issues to be resolved

[0007] The utility model mainly addresses the above problems and proposes a double-sided electrostatic spraying device for lithium battery separators, the purpose of which is to solve the problem that during the coating process, the separator's own weight will cause uneven stretching in the vertical direction, thereby affecting the uniformity of the coating.

[0008] (2) Technical solution

[0009] To achieve the above-mentioned purpose, the present invention provides a double-sided electrostatic spraying device for lithium battery separators, the device comprising:

[0010] A feed roller for allowing the movable end of the diaphragm to be modified to enter the spray chamber;

[0011] A conveying device, comprising an A-side spraying active roller, a B-side spraying active roller, and a drive motor, wherein the drive motor is connected to the A-side spraying active roller and the B-side spraying active roller to provide rotational power to drive the diaphragm to move laterally along the direction;

[0012] A spraying device comprising an A-side spraying device and an A-side spraying collection plate, a B-side spraying device and a B-side spraying collection plate, wherein the A-side spraying device and the A-side spraying collection plate are located in the A-side spraying area and are arranged opposite to each other on the diaphragm conveying path, thereby forming a high-voltage electric field; the B-side spraying device and the B-side spraying collection plate are located in the B-side spraying area and are arranged opposite to each other on the diaphragm conveying path, thereby forming a high-voltage electric field;

[0013] Discharge roller: located after the spraying device, used to send the processed double-sided modified diaphragm out of the spraying room;

[0014] Among them, a number of air holes are opened on the plate surface of the B-side spray collection plate, and an electrostatic adsorption device and / or an airflow adsorption device is set in the B-side spray collection plate, and the electrostatic adsorption device and / or the airflow adsorption device are used to provide adsorption airflow.

[0015] Furthermore, an oven is provided in the spraying room between the A-side spraying device and the B-side spraying device.

[0016] Furthermore, an oven is provided in the spraying room after the B-side spraying device.

[0017] Furthermore, the A-side spray collection plate is connected to a ground wire.

[0018] Furthermore, the B-side spray collection plate is connected to a ground wire.

[0019] Furthermore, a correction device is provided in the spraying chamber. The correction device is provided at the front end of the spraying area of ​​side A and the front end of the spraying area of ​​side B, and is used to correct the movement error of the diaphragm in real time.

[0020] Furthermore, the spraying chamber is also provided with an A-side tensioning device, a B-side tensioning device and a tension detection device. The tension detection device is arranged at the front end of the A-side spraying area and the front end of the B-side spraying area, and is used to detect the tension of the substrate diaphragm. The A-side tensioning device and the B-side tensioning device are connected to the tension detection device. When the tension detection device detects tension deviation, it sends an adjustment signal to the A-side tensioning device and the B-side tensioning device.

[0021] Furthermore, an electrostatic eliminator is provided at a position opposite to the oven.

[0022] (3) Beneficial effects

[0023] Compared to existing technologies, the present invention provides a double-sided electrostatic spraying device for lithium battery separators. The device comprises a feed roller, a conveyor, a spraying device, and a discharge roller. The spraying device includes a spraying device for side A and a collection plate for the sprayed material on side A, and a spraying device for side B and a collection plate for the sprayed material on side B. The specially designed collection plate for the sprayed material on side B is provided with air holes, and an electrostatic adsorption device and / or an airflow adsorption device provide an adsorption airflow to eliminate the influence of the separator's own weight, maintaining the separator in a tensioned state during spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a double-sided electrostatic spraying device for lithium battery separators disclosed in this application.

[0025] Figure 2 This is a structural schematic diagram of a B-side spray collection plate disclosed in this application.

[0026] Reference numerals shown in the figure: 1. spraying chamber; 2. diaphragm; 3. feed roller; 4. tension detection device; 5. correction device; 6. A-side spraying active roller; 7. A-side spraying device; 8. ground wire; 9. A-side tensioning device; 10. oven; 11. B-side spraying active roller; 12. B-side spraying device; 13. B-side tensioning device; 14. discharge roller; 15. A-side spraying collecting plate; 16. B-side spraying collecting plate; 17. static electricity elimination device; 160. air hole. DETAILED DESCRIPTION

[0027] The following is a detailed description of the present invention in conjunction with the accompanying drawings, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] See also Figure 1 The figure shows a schematic structural diagram of a double-sided electrostatic spraying device for lithium battery separators provided in a preferred embodiment of the present application. Figure 1 In the embodiment shown, the apparatus comprises:

[0031] A feed roller 3 is used to allow the movable end of the diaphragm 2 to be modified to enter the spray chamber 1;

[0032] A conveying device, comprising an A-side spraying active roller 6, a B-side spraying active roller 11, and a drive motor, the drive motor being connected to the A-side spraying active roller 6 and the B-side spraying active roller 11 to provide rotational power to drive the diaphragm 3 to move laterally along the direction;

[0033] A spraying device, comprising an A-side spraying device 7 and an A-side spraying collection plate 15, a B-side spraying device 12 and a B-side spraying collection plate 16, wherein the A-side spraying device 7 and the A-side spraying collection plate 15 are located in the A-side spraying area and are arranged opposite to each other on the conveying path of the diaphragm 2, and form a high-voltage electric field; the B-side spraying device 12 and the B-side spraying collection plate 16 are located in the B-side spraying area and are arranged opposite to each other on the conveying path of the diaphragm 2, and form a high-voltage electric field;

[0034] The discharge roller 14 is located after the spraying device and is used to send the processed double-sided modified diaphragm 2 out of the spraying chamber 1.

[0035] Among them, a number of air holes 160 are opened on the plate surface of the B-side spray collection plate 16, and an electrostatic adsorption device (not shown) is provided in the B-side spray collection plate 16, and the electrostatic adsorption device is used to provide adsorption airflow; in this embodiment, the electrostatic adsorption device will interfere with the high-voltage electric field and thus affect the progress of electrostatic spraying. An airflow adsorption device can be provided to eliminate the influence of the diaphragm's own weight, improve the spraying quality, and thus improve the coating performance.

[0036] Through these components, the entire device realizes double-sided electrostatic spraying of lithium battery separators, ensuring the uniformity and consistency of the coating, which helps to improve the performance and safety of lithium batteries.

[0037] In this embodiment, an oven 10 is provided between the A-side spraying device 7 and the B-side spraying device 12 in the spraying room, and in the spraying room 1 after the B-side spraying device 12. The function of these ovens 10 is to heat the diaphragm after spraying is completed to solidify, dry the coating, remove residual charges, and ensure the uniformity and adhesion of the coating. Since the two ovens 10 are arranged on a continuous conveyor line and are located at different spraying surfaces, long drying stops can be reduced, and the side effects caused by repeated drying can be avoided. By providing an electrostatic adsorption device and / or an airflow adsorption device, the influence of the self-weight of the diaphragm 2 is eliminated, the spraying quality is improved, and the coating performance is thereby improved.

[0038] Preferably, the spray collection plate 15 on side A is connected to the ground wire 8. This can effectively eliminate static electricity, prevent static electricity from affecting operators and equipment, and help stabilize the spraying process. Similarly, the spray collection plate 16 on side B is also connected to the ground wire 8 to achieve a similar effect as side A, ensuring static balance and eliminating the potential impact of static electricity on the environment and equipment.

[0039] Preferably, a deviation correction device 5 is further provided in the spraying chamber 1. The deviation correction device 5 is provided at the front end of the spraying area of ​​the A side and the front end of the spraying area of ​​the B side, and is used to correct the movement error of the diaphragm in real time.

[0040] Preferably, the spraying chamber 1 is also provided with an A-side tensioning device 9, a B-side tensioning device 13 and a tension detection device 4. The tension detection device 4 is arranged at the front end of the A-side spraying area and the front end of the B-side spraying area, and is used to detect the tension of the substrate diaphragm 2. The A-side tensioning device 9 and the B-side tensioning device 13 are connected to the tension detection device 4. When the tension detection device 4 monitors the tension offset of the A-side spraying area and the B-side spraying area, it sends an adjustment signal to the A-side tensioning device 9 and the B-side tensioning device 13.

[0041] Preferably, an electrostatic eliminator 17 is provided at a position opposite to the oven 10 , and residual charges may be removed by the electrostatic eliminator 17 after the high-voltage electric field passes through.

[0042] The working principle of this embodiment is as follows: first, the substrate diaphragm 2 to be modified is placed on the feed roller 3, and the movable end of the substrate diaphragm 2 enters the spray chamber 1 and reaches the A-side spraying active roller 6. A tension detection device 4 and a correction device 5 are provided in the middle. When the tension deviation reaches the set value, the A-side tensioning device 9 is driven to adjust. During operation, the drive motor drives the A-side spraying active roller 6 to rotate, causing the diaphragm 2 to move laterally. At the same time, the A-side spraying device 7 is turned on, forming a high-voltage electric field with the A-side spraying collection plate 15 for electrostatic spraying. After spraying is completed, it enters the drying oven 10 for drying and removal of residual charge. After passing through the correction device 5, it enters the B-side spraying area. Similarly, the drive motor drives the B-side spraying active roller 11 to rotate, causing the diaphragm 2 to move laterally. The B-side spraying device 12 is turned on, and electrostatic spraying of the B-side begins. After spraying is completed, it enters the drying oven 10 for drying and removal of residual charge. Finally, the electrostatically sprayed double-sided modified diaphragm is collected by the discharge roller 14.

[0043] Therefore, from any point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the application is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in this application. Any figure mark in the claims should not be regarded as limiting the claim involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim may also be implemented by the same unit or device through software or hardware. The words first, second, etc. are used to indicate names and do not indicate any particular order.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A double-sided electrostatic spraying device for lithium battery separators, characterized in that: The device comprises: A feed roller for allowing the movable end of the diaphragm to be modified to enter the spray chamber; A conveying device, comprising an A-side spraying active roller, a B-side spraying active roller, and a drive motor, wherein the drive motor is connected to the A-side spraying active roller and the B-side spraying active roller to provide rotational power to drive the diaphragm to move laterally along the direction; A spraying device comprising an A-side spraying device and an A-side spraying collection plate, a B-side spraying device and a B-side spraying collection plate, wherein the A-side spraying device and the A-side spraying collection plate are located in the A-side spraying area and are arranged opposite to each other on the diaphragm conveying path, thereby forming a high-voltage electric field; the B-side spraying device and the B-side spraying collection plate are located in the B-side spraying area and are arranged opposite to each other on the diaphragm conveying path, thereby forming a high-voltage electric field; Discharge roller: located after the spraying device, used to send the processed double-sided modified diaphragm out of the spraying room; Among them, a number of air holes are opened on the plate surface of the B-side spray collection plate, and an electrostatic adsorption device and / or an airflow adsorption device is set in the B-side spray collection plate, and the electrostatic adsorption device and / or the airflow adsorption device are used to provide adsorption airflow.

2. A double-sided electrostatic spraying device for lithium battery separators according to claim 1, characterized in that: An oven is also provided in the spraying room between the A-side spraying device and the B-side spraying device.

3. The double-sided electrostatic spraying device for lithium battery separator according to claim 1, characterized in that: An oven is also provided in the spraying room after the B-side spraying device.

4. A double-sided electrostatic spraying device for lithium battery separator according to claim 1, characterized in that: The A-side spray collection plate is connected to the ground wire.

5. The double-sided electrostatic spraying device for lithium battery separator according to claim 1, characterized in that: The B-side spray collection plate is connected to the ground wire.

6. The double-sided electrostatic spraying device for lithium battery separator according to claim 1, characterized in that: The spray chamber is further provided with a deviation correction device, which is arranged at the front end of the A-side spraying area and the front end of the B-side spraying area for correcting the movement error of the diaphragm in real time.

7. The double-sided electrostatic spraying device for lithium battery separator according to claim 1, characterized in that: The spraying chamber is also provided with an A-side tensioning device, a B-side tensioning device and a tension detection device. The tension detection device is arranged at the front end of the A-side spraying area and the front end of the B-side spraying area, and is used to detect the tension of the substrate diaphragm. The A-side tensioning device and the B-side tensioning device are connected to the tension detection device. When the tension detection device monitors the tension deviation, it sends an adjustment signal to the A-side tensioning device and the B-side tensioning device.

8. A double-sided electrostatic spraying device for lithium battery separators according to claim 2 or 3, characterized in that: An electrostatic eliminator is provided at a position opposite to the oven.

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