Online coating and drying device for battery diaphragm

Abstract

The utility model discloses an online coating and drying device for a battery diaphragm, which is arranged at the upstream of a winding device and comprises a drying platform supported on the ground, a traction mechanism and a coating mechanism which are arranged below the drying platform, and a drying mechanism arranged above the drying platform, the traction mechanism comprises at least one pair of traction rollers for introducing the battery diaphragm into the coating and drying device; the coating mechanism comprises a pair of coating machines, one coating machine receives the battery diaphragm conveyed by one traction roller, each coating machine comprises a plurality of conveying rollers and a coating die head, the battery diaphragm sequentially bypasses the conveying rollers to form a moving path, and a discharge port of the coating die head is movably arranged on one side of the moving path; the drying mechanism comprises a pair of drying assemblies, one drying assembly receives the battery diaphragm conveyed by one coating machine, and each drying assembly comprises a drying channel and a plurality of heating pieces. The coating device is uniform in coating, compact in space, convenient to operate and capable of achieving continuous production.

Description

Technical Field

[0001] The present application relates to the technical field of battery separator production equipment, and in particular to an online coating and drying device for battery separators. Background Art

[0002] At present, traditional lithium battery separator coating is all done offline, which has high production cost, low efficiency, large space occupation, and the traditional roller coating method is prone to poor coating quality, which affects the quality of the membrane; the low production efficiency cannot meet market demand. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the purpose of this application is to provide an online coating and drying device for battery separators.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solution: an online coating and drying device for battery separator, arranged upstream of a winding device, the coating and drying device comprising:

[0005] A drying platform supported on the ground;

[0006] A traction mechanism, arranged below the drying platform and comprising at least one pair of traction rollers for introducing the battery separator into the coating and drying device;

[0007] A coating mechanism is arranged below the drying platform, the coating mechanism comprises at least one pair of coaters, one coater receives a battery separator conveyed by a traction roller, each coater comprises a plurality of conveying rollers and a coating die for extrusion coating, the battery separator passes around the plurality of conveying rollers in sequence to form a moving path, and the discharge port of the coating die is movably arranged on one side of the moving path to approach and move away from the moving path; and

[0008] The drying mechanism is supported above the drying platform, and the drying mechanism includes at least one pair of drying components, one of the drying components receives a battery diaphragm conveyed by the coating machine, and each of the drying components includes a drying channel for conveying the corresponding battery diaphragm and a plurality of heating elements arranged in the drying channel.

[0009] In the above technical solution, it is further preferred that the traction mechanism further includes at least one pair of tension detection components, and one tension detection component is configured for one traction roller.

[0010] In the above technical solution, it is further preferred that each of the coating machines also includes a coating roller located downstream of the coating die head, and the coating roller and the coating die head are located on the same side of the moving path, and are configured to be movably arranged on one side of the moving path to approach and move away from the moving path.

[0011] In the above technical solution, it is further preferred that each of the drying channels has an inlet and an outlet, and a roller assembly is respectively provided at the inlet and the outlet, and each of the roller assemblies includes a vacuum adsorption roller rotatably arranged on the drying platform, and a plurality of openings are provided on the surface of the vacuum adsorption roller, and an adsorption member is provided inside the vacuum adsorption roller to load negative pressure at the plurality of openings.

[0012] In the above technical solution, it is further preferred that the roller assembly arranged at the inlet further includes a tension roller rotatably arranged on the drying platform and a driving motor transmission-connected to the tension roller.

[0013] In the above technical solution, it is further preferred that the roller assembly arranged at the outlet of the drying channel further includes a rotatable bending roller and an electrostatic rod arranged between the bending roller and the corresponding vacuum adsorption roller.

[0014] In the above technical scheme, it is further preferred that each of the drying components includes a plurality of drying boxes connected in sequence from front to back, each of the drying boxes includes a box body with a drying space and a plurality of drying rollers rotatably arranged in the box body, the plurality of drying rollers are arranged in sequence from front to back in the box body and are located below the corresponding drying spaces, and the drying spaces of the plurality of drying boxes are connected in sequence to form the drying channel.

[0015] In the above technical scheme, it is further preferred that each of the drying components includes an air inlet channel and an exhaust channel connected to the drying channel, the air inlet channel includes a plurality of air inlets connected to the drying channel and an air inlet fan fluidly connected to the plurality of air inlets, the air inlet fan is configured to unidirectionally transport air from the outside of the drying component to the plurality of air inlets, the exhaust channel includes a plurality of air outlets connected to the drying channel and an exhaust fan fluidly connected to the plurality of air outlets, and the exhaust fan is configured to unidirectionally transport air from the plurality of air outlets to the outside of the drying component.

[0016] In the above technical solution, it is further preferred that the drying mechanism also includes a temperature control system and a plurality of temperature sensors arranged in the drying channel, and the temperature control system is connected to the plurality of temperature sensors and the plurality of heating elements.

[0017] In the above technical solution, it is further preferred that each of the drying boxes is divided into several temperature control areas from front to back, and each of the temperature control areas is configured with at least one of the temperature sensors, at least one of the heating elements, at least one of the air inlets and at least one of the exhaust outlets.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present application uses two coating machines and a drying assembly to coat and dry a wide battery film, with uniform coating, compact space, easy operation, and the ability to achieve continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a coating and drying device provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the traction mechanism;

[0022] Figure 3 for Figure 1 The structural schematic diagram of the coating machine in FIG.

[0023] Figure 4 for Figure 1 The structural schematic diagram of the drying box in FIG.

[0024] Figure 5 for Figure 1 A roller assembly at the entrance of the middle drying channel;

[0025] Figure 6 for Figure 1 Roller assembly at the exit of the middle drying channel.

[0026] Wherein: 100, coating and drying device; 10, drying platform; 20, traction mechanism; 1, frame; 2, traction roller; 3, tension detection component; 30, coating mechanism; 4, coater; 41, support frame; 42, conveying roller; 43, coating die head; 44, coating roller; 45, adjustment component; 46, pushing component; 40, drying mechanism; 5, drying component; 51, drying channel; 511, inlet; 512, outlet; 52, heating element; 53, drying box; 531, box body; 532, drying roller; 6, roller assembly; 61, vacuum adsorption roller; 62, tension roller; 7, roller assembly; 71, bending roller; 72, vacuum adsorption roller; 73, electrostatic rod; 8, temperature control system; 200, winding device. DETAILED DESCRIPTION

[0027] To describe the technical content, structural features, achieved purpose and effect of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0028] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0029] The terms “upper”, “lower”, “front” and “back” in this application refer to the attached Figure 1 Top, bottom, front and back shown.

[0030] In the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0031] An embodiment of the present application provides an online coating and drying device for battery separators. The coating and drying device is arranged upstream of a winding device and is used to dry the battery separator that has undergone extraction and drying and then convey it to the winding device for winding by the winding device. The device is particularly suitable for drying and coating wide-width battery separators.

[0032] like Figure 1 As shown, the coating and drying device 100 includes a drying platform 10, a traction mechanism 20, a coating mechanism 30 and a drying mechanism 40. According to the moving path of the battery diaphragm, the traction mechanism 20, the coating mechanism 30 and the drying mechanism 40 are sequentially distributed from upstream to downstream. The drying platform 10 is supported on the ground, and the space occupied is divided into an upper space and a lower space. The traction mechanism 20, the coating mechanism 30 and the winding device 200 are installed in the lower space below the drying platform 10. The drying mechanism 40 is supported on the drying platform 10 and is located in the upper space, which is conducive to reducing the floor space of the coating and drying device 100.

[0033] The traction mechanism 20 is used to introduce the battery diaphragm output by the upstream equipment into the coating and drying device 100, so that the coating and drying device 100 applies a coating and dries the surface of the battery diaphragm, making it easier for the downstream winding device to wind up the dried battery diaphragm.

[0034] like Figure 2 As shown, the wide battery separator is cut into two parts, left and right, at the traction mechanism 20. The traction mechanism 20 includes a frame 1, a pair of traction rollers 2 rotatably arranged on the frame 1, and a pair of tension detection components 3. The pair of traction rollers 2 are driven by a traction motor to rotate around their own axis. The pair of rotating traction rollers 2 respectively convey the two parts of the battery separator to the downstream coating mechanism 30. A tension detection component 3 is configured downstream of a traction roller 2. The tension detection component 3 is connected to the corresponding traction motor signal. The tension detection component 3 is used to detect the tension of the corresponding battery separator being pulled, and control the operation of the corresponding traction motor based on the detection result, so that the pair of traction rollers 2 ensure low tension and constant tension transportation, avoid the battery separator from being stretched and wrinkled, and improve the quality of the battery separator.

[0035] like Figure 1 , 3 As shown, the coating mechanism 30 includes a pair of coaters 4, one coater 4 corresponds to a traction roller 2 to receive the battery separator drawn out by the corresponding traction roller 2, and coat the surface of the battery separator. The coater 4 includes a support frame 41, a plurality of conveying rollers 42, a coating die 43 for extruding the coating, and a coating roller 44 for coating the coating. The plurality of conveying rollers 42 are rotatably arranged on the support frame 41, and the battery separator introduced into the coater 4 bypasses the plurality of conveying rollers 42 in sequence to form a moving path. The coating die 43 is movably arranged on one side of the moving path, and the coating die 43 has a discharge port 430 for extruding the coating, and the discharge port 430 faces the moving path; the coating die 43 is movably arranged on the support frame 41 through an adjustment component 45, and approaches and moves away from the battery separator in the moving path under the drive of the adjustment component 45. The coating roller 44 is movably arranged on the support frame 41 through a pushing assembly 46, and is arranged on the same side of the moving path as the coating die 43; on the moving path of the battery diaphragm, the coating roller 44 is located downstream of the coating die 43, and the coating roller 44 is driven by the pushing assembly 46 to approach the battery diaphragm in the moving path to evenly coat the coating extruded by the coating die 43 on the battery diaphragm, and the distance between the coating roller 44 and the coating die 43 and the battery diaphragm is adjustable to adjust the thickness of the coating on the surface of the battery diaphragm. The coating mechanism 30 applies a coating with uniform thickness to the battery diaphragm, and performs online coating to improve production efficiency.

[0036] like Figure 1 , 4As shown, the drying mechanism 40 includes at least one pair of drying components 5, one drying component 5 corresponds to one coating machine 4 to receive the battery diaphragm led out by the corresponding coating machine 4, and is used to dry the battery diaphragm, so that the dried battery diaphragm can be transported to the winding device for winding. Each drying component 5 includes a drying channel 51 for conveying the corresponding battery diaphragm and a plurality of heating elements 52 arranged in sequence from front to back, and the plurality of heating elements 52 heat the air in the drying channel 51. The battery diaphragm is conveyed in the drying channel and heated and dried by the hot air in the drying channel 51. Each drying channel 51 includes an inlet 511 for inputting the battery diaphragm and an outlet 512 for outputting the battery diaphragm. The inlet 511 is located above the coating mechanism 30, and the outlet 512 is located above the winding device 200, so as to avoid the battery diaphragm being stretched due to the excessively long conveying path of the battery diaphragm.

[0037] like Figure 1 , 5 As shown in FIG. 6 , a roller assembly 6 is provided at each inlet 511, and a roller assembly 7 is provided at each outlet 512. The roller assembly 6 pulls the battery diaphragm into the corresponding drying channel 51. The roller assembly 6 includes a vacuum adsorption roller 61 and a tension roller 62 rotatably provided on the drying platform 10. The roller surface of the vacuum adsorption roller 61 is provided with a plurality of openings, and an adsorption member is provided inside. The adsorption member is fluidly connected with the plurality of openings on the roller surface to load negative pressure at the plurality of openings, so that the battery diaphragm can be adsorbed on the surface of the vacuum adsorption roller 61, and is transported downstream when the vacuum adsorption roller 61 rotates, effectively avoiding the problem of left and right deviation of the battery diaphragm during transportation. The tension roller 62 transports the battery diaphragm downstream of the vacuum adsorption roller 61, effectively adjusting the speed of the transported battery diaphragm, and realizing low-tension transportation of the battery diaphragm.

[0038] The roller assembly 7 conveys the battery diaphragm in the corresponding drying channel 51 to the winding device 200. The roller assembly 7 includes a bending roller 71 and a vacuum adsorption roller 72 rotatably arranged on the drying platform 10, and an electrostatic rod 73 arranged between the bending roller 71 and the vacuum adsorption roller 72. The bending roller 71 rotates under the drive of the motor to pull the battery diaphragm; the vacuum adsorption roller 72 has the same structure and function as the vacuum adsorption roller 61, which will not be elaborated here; the electrostatic rod 73 removes the static electricity of the battery diaphragm, thereby improving the winding quality of the battery diaphragm.

[0039] Continue to refer to Figure 1 and Figure 4Each drying component 5 includes a plurality of drying boxes 53 connected in sequence from front to back, each drying box 53 includes a box body 531 having a drying space and a plurality of drying rollers 532 rotatably arranged in the box body 531, the plurality of drying rollers 532 are arranged in sequence from front to back in the box body 531 and are located below the drying space, the plurality of drying boxes 53 of the drying component 5 are connected in sequence from front to back, the plurality of connected drying spaces form a drying channel 51, the battery diaphragm is transported in the drying channel 51, and the plurality of drying rollers 532 support and transport the battery diaphragm below the drying channel 51.

[0040] The drying assembly 5 further includes an air inlet channel (not shown in the figure) and an air exhaust channel (not shown in the figure) connected to the drying channel 51. The air inlet channel includes a plurality of air inlets connected to the drying channel and an air inlet fan in fluid communication with the plurality of air inlets. When the air inlet fan is in operation, fresh air is transported from the outside of the drying box 53 to the drying channel 51 to reduce the temperature in the drying channel 51. The air exhaust channel includes a plurality of air exhaust ports connected to the drying channel 51 and an exhaust fan in fluid communication with the plurality of air exhaust ports. When the exhaust fan is in operation, the hot air in the drying channel 51 is discharged to the outside of the drying box 53. The air inlet fan and the exhaust fan work simultaneously to achieve the purpose of air exchange.

[0041] A plurality of temperature sensors are also provided in the drying channel 51 , each of which is used to monitor the temperature in the drying channel 51 , so as to monitor and adjust the drying temperature in the drying channel 51 in real time.

[0042] Each drying box 53 is divided into several temperature control areas from front to back, and each temperature control area is configured with at least one temperature sensor, at least one heating element 52, at least one air inlet and at least one air outlet; the drying mechanism 40 also includes a temperature control system 8, which is connected to several temperature sensors and several heating elements 52, and adjusts the temperature of the heating element 52 based on the detection results of each temperature sensor, thereby realizing temperature control of each temperature control area, improving the accuracy of temperature control, and improving drying efficiency.

[0043] The present application uses two coating machines and a drying assembly to coat and dry a wide battery film, with uniform coating, compact space, easy operation, and the ability to achieve continuous production.

[0044] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and the scope of protection required by the present application is defined by the attached claims, description and their equivalents.

Claims

1. An online coating and drying device for battery separator, arranged upstream of a winding device, characterized in that: The coating and drying device comprises: A drying platform supported on the ground; A traction mechanism, arranged below the drying platform and comprising at least one traction roller for introducing the battery separator into the coating and drying device; A coating mechanism is arranged below the drying platform, the coating mechanism comprises at least one pair of coaters, one coater receives a battery separator conveyed by a traction roller, each coater comprises a plurality of conveying rollers and a coating die for extrusion coating, the battery separator passes around the plurality of conveying rollers in sequence to form a moving path, and the discharge port of the coating die is movably arranged on one side of the moving path to approach and move away from the moving path; and The drying mechanism is supported above the drying platform, and the drying mechanism includes at least one pair of drying components, one of the drying components receives a battery diaphragm conveyed by the coating machine, and each of the drying components includes a drying channel for conveying the corresponding battery diaphragm and a plurality of heating elements arranged in the drying channel.

2. The coating and drying device according to claim 1, characterized in that: The traction mechanism further comprises at least one pair of tension detection components, and one tension detection component is configured for each traction roller.

3. The coating and drying device according to claim 1, characterized in that: Each of the coating machines further comprises a coating roller located downstream of the coating die, the coating roller and the coating die are located on the same side of the moving path, and are configured to be movably disposed on one side of the moving path to approach and move away from the moving path.

4. The coating and drying device according to claim 1, characterized in that: Each of the drying channels has an inlet and an outlet, and a roller assembly is respectively provided at the inlet and the outlet. Each of the roller assemblies includes a vacuum adsorption roller rotatably arranged on the drying platform, and a plurality of openings are provided on the surface of the vacuum adsorption roller. An adsorption member is provided inside the vacuum adsorption roller to load negative pressure at the plurality of openings.

5. The coating and drying device according to claim 4, characterized in that: The roller assembly arranged at the inlet also includes a tension roller rotatably arranged on the drying platform and a driving motor transmission-connected with the tension roller.

6. The coating and drying device according to claim 5, characterized in that: The roller assembly arranged at the outlet of the drying channel also includes a rotatably arranged bending roller and an electrostatic rod arranged between the bending roller and the corresponding vacuum adsorption roller.

7. The coating and drying device according to claim 1, characterized in that: Each of the drying components includes a plurality of drying boxes connected in sequence from front to back, each of the drying boxes includes a box body with a drying space and a plurality of drying rollers rotatably arranged in the box body, the plurality of drying rollers are arranged in sequence from front to back in the box body and are located below the corresponding drying space, and the drying spaces of the plurality of drying boxes are connected in sequence to form the drying channel.

8. The coating and drying device according to claim 7, characterized in that: Each of the drying components includes an air inlet channel and an exhaust channel connected to the drying channel, the air inlet channel includes a plurality of air inlets connected to the drying channel and an air inlet fan fluidly connected to the plurality of air inlets, the air inlet fan is configured to unidirectionally transport air from the outside of the drying component to the plurality of air inlets, the exhaust channel includes a plurality of air outlets connected to the drying channel and an exhaust fan fluidly connected to the plurality of air outlets, the exhaust fan is configured to unidirectionally transport air from the plurality of air outlets to the outside of the drying component.

9. The coating and drying device according to claim 8, characterized in that: The drying mechanism further comprises a temperature control system and a plurality of temperature sensors arranged in the drying channel, and the temperature control system is connected with the plurality of temperature sensors and the plurality of heating elements.

10. The coating and drying device according to claim 9, characterized in that: Each of the drying boxes is divided into a plurality of temperature control areas from front to back, and each of the temperature control areas is configured with at least one of the temperature sensors, at least one of the heating elements, at least one of the air inlets and at least one of the air outlets.

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