Double-sided micro-gravure coating machine for lithium battery diaphragm

Abstract

The utility model relates to the technical field of lithium battery diaphragm coating, in particular to a double-sided micro gravure coating machine for a lithium battery diaphragm, which comprises an unwinding device, a preheating air bellow, a traction mechanism before coating, a double-sided coating mechanism, a drying device, an adsorption traction mechanism and a winding device which are arranged in sequence, the double-face coating mechanism comprises a rack, a first micro-concave roller and a second micro-concave roller, an adsorption roller is installed on the portion, between the first micro-concave roller and the second micro-concave roller, of the rack, an adjusting roller is arranged on one side of the second micro-concave roller, and an edge pressing wheel assembly is arranged between the drying device and the adsorption traction device. The edge pressing wheel assembly comprises an angle adjusting assembly, a pressing roller, a pressing roller adjusting assembly and a supporting roller, the angle adjusting assembly is provided with a mounting plate and an adjusting piece, the supporting roller and the pressing roller adjusting assembly are mounted on the mounting plate, the pressing roller adjusting assembly is connected with the pressing roller, and the pressing roller is arranged above the supporting roller. The double-sided coating mechanism disclosed by the utility model can ensure effective support, and is high in coating quality and good in coating stability.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragm coating, in particular to a double-sided micro-concave coating machine for lithium battery diaphragms. Background Art

[0002] Micro-dimpled coating is widely used in lithium battery separator coating, such as ceramic coating, PVDF coating, boehmite coating, etc. However, currently, micro-dimpled coating is applied separately on the front and back sides. That is, after the first and second sides of the lithium battery separator are coated, they need to be placed in a roller drying oven for heating and drying. This coating method has the following shortcomings: 1. The original method has high requirements for the site; 2. During the production process, the coated surface will contact the roller in the drying oven, which may cause scratches on the coated surface; 3. The overall sealing of the roller-type bellows is poor, and the circulating air utilization rate is relatively low; 4. The roller-type bellows has rollers and transmission devices, and the subsequent maintenance cost is relatively high.

[0003] Currently, suspension drying ovens are widely used in the coating industry due to their roller-free design, effectively overcoming the shortcomings of roller-type drying ovens. However, existing double-sided coating mechanisms cannot provide effective support during coating, resulting in poor coating quality and stability. Furthermore, the thin film can wrinkle and other defects when transferred to the winding device after drying, requiring careful adjustment of the film's position. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a double-sided micro-concave coating machine for lithium battery separators.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a double-sided micro-concave coating machine for lithium battery separators, including an unwinding device, a preheating bellows, a pre-coating traction mechanism, a double-sided coating mechanism, a drying device, an adsorption traction mechanism and a winding device, which are arranged in sequence.

[0006] The double-sided coating mechanism includes a frame, a first micro-concave roller installed in the middle of the frame, and a second micro-concave roller installed on the top of the frame. An adsorption roller is installed on the frame between the first micro-concave roller and the second micro-concave roller, and an adjustment roller is provided on one side of the second micro-concave roller.

[0007] A pressing wheel assembly is arranged between the drying device and the adsorption and traction device, and the pressing wheel assembly includes an angle adjustment assembly, a pressing roller, a pressing roller adjustment assembly and a support roller. The angle adjustment assembly has a mounting plate and an adjustment member, and the support roller and the pressing roller adjustment assembly are installed on the mounting plate. The pressing roller adjustment assembly is connected to the pressing roller, and the pressing roller is arranged above the support roller.

[0008] Furthermore, the adjusting member includes an adjusting base, a handwheel, a handwheel shaft and an adjusting rod, the handwheel is installed at one end of the handwheel shaft, the handwheel shaft passes through the adjusting base horizontally, and a first bevel gear is installed on the handwheel shaft, the adjusting rod passes through the adjusting base longitudinally, and a second bevel gear meshing with the first bevel gear is installed on the adjusting rod.

[0009] Furthermore, the pressure roller adjustment assembly includes a cylinder, a rotating shaft and a pressure roller frame. The cylinder is installed on the mounting plate through a cylinder seat. The output end of the cylinder is connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to the middle section of the pressure roller frame.

[0010] Furthermore, a support frame is fixed on the mounting plate, the rotating shaft is arranged through the support frame, and one end of the rotating shaft is connected to the pressure roller frame through a connector.

[0011] Furthermore, the output end of the cylinder is connected to the rotating shaft through a clamping bearing.

[0012] Furthermore, a back coating roller is provided on the frame close to the first micro-concave roller, and a second arc roller is provided between the adjustment roller and the adsorption roller.

[0013] Furthermore, a first arc roller and a transition roller are sequentially arranged between the bottom of the frame and the first slightly concave roller.

[0014] Furthermore, the drying device includes several air-storage suspension bellows spliced ​​together, and the top and bottom of the air-suspension bellows are respectively provided with an upper air supply box and a lower air supply box, and the upper air supply box is evenly distributed with several slit air nozzles, and the lower air supply box is evenly distributed with several wing-shaped air nozzles, and the wing-shaped air nozzles are arranged in the middle of two adjacent slit seals.

[0015] Furthermore, a first guide roller, a tension roller and a second guide roller are sequentially arranged between the pressure wheel assembly and the adsorption and traction mechanism, and a tension sensor is installed on the tension roller.

[0016] The beneficial effects of the utility model are:

[0017] (1) An adsorption traction mechanism is set between the drying device and the winding device to ensure the winding quality;

[0018] (2) A pressing wheel assembly is provided between the drying device and the adsorption traction device. The angle of the entire pressing wheel assembly can be adjusted by the angle adjustment assembly, and the angle of the pressing roller can be adjusted by the pressing roller adjustment assembly to meet the pressing requirements of diaphragms of different widths or thicknesses;

[0019] (3) An adsorption roller is set between the first micro-concave roller and the second micro-concave roller to ensure that the first side of the diaphragm is smoothly guided to the second micro-concave roller after coating. An adjustment roller is provided on one side of the second micro-concave roller to facilitate the adjustment of the coating on the second side of the diaphragm. In this way, effective support and coating quality are guaranteed, and the stability of coating is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 It is a structural diagram of the double-sided coating mechanism in the utility model.

[0023] Figure 3 A schematic structural diagram of the medium-pressure side wheel assembly of the present utility model.

[0024] Figure 4 yes Figure 3 Schematic diagram of the structure in another direction.

[0025] Figure 5 yes Figure 3 Schematic diagram of the structure of the intermediate pressure roller adjustment assembly.

[0026] Figure 6 It is a structural diagram of the drying device in the utility model.

[0027] Figure 7 It is a structural diagram of the adsorption and traction mechanism in the utility model.

[0028] In the figure: 1. Unwinding device, 2. Preheating bellows, 3. Pre-coating traction mechanism, 4. Double-sided coating mechanism, 5. Drying device, 6. Adsorption traction mechanism, 7. Rewinding device, 8. Edge pressing wheel assembly, 9. First guide roller, 10. Tension roller, 11. Second guide roller, 41. Frame, 42. First micro-concave roller, 43. Second micro-concave roller, 44. Adsorption roller, 45. Adjustment roller, 46. Back coating roller, 47. Transition roller, 48. Second curved roller, 49. First curved roller, 81. Angle adjustment assembly, 82. Pressing roller, 83. Pressure roller adjustment assembly, 84. Support roller, 811. Mounting plate, 812. Adjusting part, 8121. Adjustment base, 8122. Handwheel, 8123. Handwheel shaft, 8124. Adjusting rod, 8125. First bevel gear, 8126. Second bevel gear, 831. Cylinder, 832. Rotating shaft, 833. Pressure roller frame, 834. Support frame, 835. Connecting head, 50. Air suspension bellows, 501. Upper air box, 502. Lower air box, 503. Slit nozzle, 504. Airfoil nozzle. DETAILED DESCRIPTION

[0029] The present invention will now be further described with reference to the accompanying drawings, which are simplified schematic diagrams illustrating the basic structure of the present invention in a schematic manner, and thus only show components related to the present invention.

[0030] like Figure 1 As shown, a double-sided micro-dimpled coating machine for lithium battery separators includes an unwinding device 1, a preheating bellows 2, a pre-coating traction mechanism 3, a double-sided coating mechanism 4, a drying device 5, an adsorption traction mechanism 6, and a winding device 7, which are arranged in sequence. The preheating bellows 2 can be a conventional roller-type drying oven, and the winding device 7 and unwinding device 1 are conventional winding and unwinding devices. The pre-coating traction mechanism 3 and the adsorption traction mechanism 6 both use adsorption rollers for traction.

[0031] like Figure 2 As shown, the double-sided coating mechanism 4 includes a frame 41, a first micro-concave roller 42 installed in the middle section of the frame 41, and a second micro-concave roller 43 installed on the top of the frame 41. An adsorption roller 44 is installed on the frame 41 between the first micro-concave roller 42 and the second micro-concave roller 43, and an adjustment roller 45 is provided on one side of the second micro-concave roller 43; a back coating roller 46 is provided on the frame 41 near the first micro-concave roller 42, a second arc roller 48 is provided between the adjustment roller 45 and the adsorption roller 44, and a first arc roller 49 and a transition roller 47 are sequentially provided between the bottom of the frame 41 and the first micro-concave roller 42. When coating starts, the diaphragm comes from the pre-coating traction mechanism 3, passes through the first curved roller 49 and the transition roller 47, and reaches the first micro-concave roller 42, and is coated on one side of the diaphragm in combination with the back coating roller 46. After coating is completed, the diaphragm continues to be transported, passing through the adsorption roller 44 and the second curved roller 48 in turn to reach the adjustment roller 45. The adjustment roller 45 is adjusted according to the data feedback from the subsequent tension sensor, and the other side of the diaphragm is coated through the second micro-concave roller 43, and then enters the drying device 5 for drying.

[0032] like Figure 3 and Figure 4 As shown, a pressing wheel assembly 8 is arranged between the drying device 5 and the adsorption and traction device 6. The pressing wheel assembly 8 includes an angle adjustment assembly 81, a pressing roller 82, a pressing roller adjustment assembly 83 and a support roller 84. The angle adjustment assembly 81 has a mounting plate 811 and an adjustment member 812. The support roller 84 and the pressing roller adjustment assembly 83 are installed on the mounting plate 811. The pressing roller adjustment assembly 83 is connected to the pressing roller 82, and the pressing roller 82 is arranged above the support roller 84. The adjusting member 812 includes an adjusting base 8121, a handwheel 8122, a handwheel shaft 8123 and an adjusting rod 8124. The handwheel 8122 is installed at one end of the handwheel shaft 8123. The handwheel shaft 8123 passes through the adjusting base 8121 horizontally, and a first bevel gear 8125 is installed on the handwheel shaft 8123. The adjusting rod 8124 passes through the adjusting base 8121 longitudinally, and a second bevel gear 8126 that meshes with the first bevel gear 8125 is installed on the adjusting rod 8124.

[0033] like Figure 5 As shown, the pressure roller adjustment assembly 83 includes a cylinder 831, a rotating shaft 832, and a pressure roller frame 833. Cylinder 831 is mounted on a mounting plate 811 via a cylinder base. The output end of cylinder 831 is connected to one end of rotating shaft 832, while the other end of rotating shaft 832 is connected to the middle section of pressure roller frame 833. A support frame 834 is fixed to mounting plate 811. Rotating shaft 833 is disposed through support frame 834. One end of rotating shaft 832 is connected to pressure roller frame 833 via connector 835. The output end of cylinder 831 is connected to rotating shaft 832 via a clamping bearing.

[0034] like Figure 6 As shown, the drying device 5 includes a number of air-saving suspended bellows 50 spliced ​​together, and the top and bottom of the air-suspended bellows 50 are respectively provided with an upper air supply box 501 and a lower air supply box 502. The upper air supply box 501 is evenly distributed with a number of slit air nozzles 503, and the lower air supply box 502 is evenly distributed with a number of wing-shaped air nozzles 504. The wing-shaped air nozzles 504 are arranged in the middle of two adjacent slit sealing nozzles 503.

[0035] The hot air in the upper air box 501 flows to the slit nozzle 503. The airflow blown out by each two adjacent slit nozzles 6 forms a vortex at the air inlet of the upper air box 501 and is finally discharged into the upper return air chamber 8. During this process, the hot air blown out by the slit nozzle 503 does not directly contact the diaphragm, but forms a stable airflow on the upper surface of the diaphragm, so that the coating of the diaphragm can be dried. The hot air in the lower air box 502 flows to the airfoil nozzle 504 and is blown out through the gap of the airfoil-type suspended nozzle, forming a "wall attachment effect". The airfoil nozzle 504 does not contact the diaphragm, but forms a layer of pressure air cushion through the flow of air. This layer of flowing pressure air cushion has an adsorption effect on the substrate and pushes the diaphragm forward, ensuring that the diaphragm is always in a certain suspended state and drying the lower surface of the diaphragm.

[0036] like Figure 7 As shown, a first guide roller 9, a tension roller 10 and a second guide roller 11 are sequentially arranged between the pressing wheel assembly 8 and the adsorption and traction mechanism 6, and a tension sensor is installed on the tension roller 10.

[0037] The above-mentioned implementation mode is only for illustrating the technical concept and features of the utility model. Its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the scope of protection of the utility model.

Claims

1. A double-sided micro-concave coating machine for lithium battery separators, characterized by: It includes an unwinding device, a preheating bellows, a traction mechanism before coating, a double-sided coating mechanism, a drying device, an adsorption traction mechanism and a winding device, which are arranged in sequence. The double-sided coating mechanism includes a frame, a first micro-concave roller installed in the middle of the frame, and a second micro-concave roller installed on the top of the frame. An adsorption roller is installed on the frame between the first micro-concave roller and the second micro-concave roller, and an adjustment roller is provided on one side of the second micro-concave roller. A pressing wheel assembly is arranged between the drying device and the adsorption and traction device, and the pressing wheel assembly includes an angle adjustment assembly, a pressing roller, a pressing roller adjustment assembly and a support roller. The angle adjustment assembly has a mounting plate and an adjustment member, and the support roller and the pressing roller adjustment assembly are installed on the mounting plate. The pressing roller adjustment assembly is connected to the pressing roller, and the pressing roller is arranged above the support roller.

2. The double-sided micro-concave coating machine for lithium battery separator according to claim 1, characterized in that: The adjusting member includes an adjusting base, a handwheel, a handwheel shaft and an adjusting rod. The handwheel is installed at one end of the handwheel shaft. The handwheel shaft passes through the adjusting base horizontally, and a first bevel gear is installed on the handwheel shaft. The adjusting rod passes through the adjusting base longitudinally, and a second bevel gear meshing with the first bevel gear is installed on the adjusting rod.

3. The double-sided micro-concave coating machine for lithium battery separator according to claim 1, characterized in that: The pressure roller adjustment assembly includes a cylinder, a rotating shaft and a pressure roller frame. The cylinder is installed on the mounting plate through a cylinder seat. The output end of the cylinder is connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to the middle section of the pressure roller frame.

4. The double-sided micro-concave coating machine for lithium battery separator according to claim 3, characterized in that: A support frame is fixed on the mounting plate, the rotating shaft is arranged through the support frame, and one end of the rotating shaft is connected to the pressure roller frame through a connector.

5. The double-sided micro-concave coating machine for lithium battery separator according to claim 3, characterized in that: The output end of the cylinder is connected to the rotating shaft through a clamping bearing.

6. The double-sided micro-concave coating machine for lithium battery separator according to claim 1, characterized in that: A back coating roller is provided on the frame close to the first micro-concave roller, and a second arc roller is provided between the adjustment roller and the adsorption roller.

7. The double-sided micro-concave coating machine for lithium battery separator according to claim 1, characterized in that: A first arc roller and a transition roller are sequentially arranged between the bottom of the frame and the first slightly concave roller.

8. The double-sided micro-concave coating machine for lithium battery separator according to claim 1, characterized in that: The drying device includes several air-saving suspension bellows spliced ​​together, and the top and bottom of the air-suspended bellows are respectively provided with an upper air supply box and a lower air supply box. The upper air supply box is evenly distributed with several slit air nozzles, and the lower air supply box is evenly distributed with several wing-shaped air nozzles. The wing-shaped air nozzles are arranged in the middle of two adjacent slit sealing nozzles.

9. The double-sided micro-concave coating machine for lithium battery separator according to claim 1, characterized in that: A first guide roller, a tension roller and a second guide roller are sequentially arranged between the edge pressing wheel assembly and the adsorption and traction mechanism, and a tension sensor is installed on the tension roller.

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