Thin film flattening device and method for lithium battery diaphragm production line

Abstract

The invention provides a film flattening device and method for a lithium battery diaphragm production line. The thin film flattening device for the lithium battery diaphragm production line comprises a connecting base fixedly installed at the bottom of a workbench through a bolt, a first frame is fixedly installed at the bottom of the connecting base, the same bidirectional lead screw is rotatably installed on the first frame, two sliding plates are installed on the bidirectional lead screw in a threaded mode, and the two sliding plates are fixedly installed on the connecting base. First square strips are arranged on the sides, away from each other, of the two sliding plates, second frame bodies are fixedly installed on the sides, away from each other, of the two first square strips, first n-shaped frames are arranged above the two second frame bodies, and first positioning rods are fixedly installed on the inner walls of the sides, away from each other, of the two first n-shaped frames. The thin film flattening device and method for the lithium battery diaphragm production line have the advantages that diaphragms with different widths and different thicknesses can be flattened, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery diaphragm production and processing, and in particular to a film flattening device and method for a lithium battery diaphragm production line. Background Art

[0002] In the structure of lithium batteries, the diaphragm is one of the key inner components. It can directly affect the battery's capacity, cycle and safety performance. A diaphragm with excellent performance plays an important role in improving the overall performance of the battery. Its main function is to separate the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through. Therefore, the diaphragm is an indispensable structure in lithium batteries. In the production process of the diaphragm, the produced diaphragm needs to be rolled up. In the rolling process, in order to prevent the diaphragm from curling and wrinkling, resulting in poor flatness of the diaphragm roll, some flattening mechanisms are generally set on the winding equipment to flatten the diaphragm.

[0003] For example, in the patent document with the authorization announcement number CN207425990U, a film flattening device for a lithium battery diaphragm coating production line is proposed. The device includes an upper roller body and a lower roller body for forming a clamping roller, and the gap between the roller surface of the upper roller body and the roller surface of the lower roller body constitutes a passage gap for the film edge to pass and flatten; there is an angle between the axis direction of each roller body and the direction of film travel, and the clamping rollers are in two groups and are symmetrically arranged at the film edges on both sides of the film along the center line of the film; the clamping rollers are placed on a base, and a receiving groove for the magnetic block to be placed is concave on the bottom surface of the base, and a magnetic fixed connection relationship is formed between the base and the frame. Although the utility model has the advantages of flexible operation, easy use and good flattening effect, it can realize the flattening function of the film edge of the film where the flattening roller cannot be placed in the film production line.

[0004] However, when using some flattening devices including the above-mentioned utility model, it was found that due to the different widths of various diaphragms, the distance between the clamping rollers on both sides of the diaphragm used to limit the two sides of the diaphragm in the above-mentioned utility model cannot be adjusted, resulting in it being able to flatten only diaphragms of one width. In addition, the thickness of commonly used diaphragms ranges from 10 microns to 30 microns, and the distance between the upper roller and the lower roller thereon cannot be adaptively adjusted, resulting in poor overall applicability.

[0005] Therefore, it is necessary to provide a new film flattening device and method for a lithium battery diaphragm production line to solve the above technical problems. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a thin film flattening device and method for a lithium battery diaphragm production line which can flatten diaphragms of different widths and thicknesses and has a wide range of applications.

[0007] To solve the above technical problems, the film flattening device for a lithium battery separator production line provided by the present invention includes: a connecting seat fixedly installed at the bottom of the workbench through bolts, a first frame fixedly installed at the bottom of the connecting seat, a bidirectional lead screw rotatably installed on the first frame, two sliding plates threadedly installed on the bidirectional lead screw, a first square bar provided on each of the two sides of the two sliding plates away from each other, a second frame fixedly installed on each of the two sides of the two first square bars away from each other, a first C-shaped frame provided above each of the two second frames, a first positioning rod fixedly installed on the inner wall of each of the two sides of the two first C-shaped frames away from each other, a lower flattening roller rotatably sleeved on each of the two first positioning rods, a connecting frame provided in each of the two first C-shaped frames, a second positioning rod fixedly installed in each of the two connecting frames, an upper flattening roller rotatably sleeved on each of the two second positioning rods, an adjusting screw threadedly installed on the top of each of the two first C-shaped frames, and the bottom end of each of the two adjusting screws is rotatably connected to the corresponding connecting frame.

[0008] Preferably, each of the two first square bars is fixedly connected to the corresponding sliding plate through bolts.

[0009] Preferably, a scale is fixedly installed on the outer wall of each of the two sides of the two first C-shaped frames away from each other, two first limiting sleeves are fixedly sleeved on each of the two first positioning rods, the closer sides of the two corresponding first limiting sleeves are in contact with the corresponding lower flattening roller, and starting benchmarks are fixedly installed on the two sides of the two first limiting sleeves away from each other. Both of the two starting benchmarks penetrate through the corresponding first C-shaped frame and are adapted to the corresponding scale. Two second limiting sleeves are fixedly sleeved on each of the two second positioning rods, the closer sides of the two corresponding second limiting sleeves are in contact with the corresponding upper flattening roller, and adjusting benchmarks are fixedly installed at the bottom of each of the two connecting frames. Both of the two adjusting benchmarks penetrate through the corresponding first C-shaped frame and are movably connected to the corresponding first C-shaped frame, and both of the two adjusting benchmarks are adapted to the corresponding scale.

[0010] Preferably, a second square bar is fixedly installed at the bottom of each of the two first C-shaped frames, the bottom ends of the two second square bars extend into the corresponding second frames respectively, and the two second square bars are respectively slidably connected to the tops of the two second frames.

[0011] Preferably, a plurality of adjusting grooves are formed on each of the two sides of the two second square bars away from each other, mounting frames are fixedly installed on the outer walls of each of the two sides of the two second frames away from each other, pulling plates are slidably installed on each of the two mounting frames, inserting rods are fixedly installed at the tops of the two pulling plates, and the closer ends of the two inserting rods extend into the corresponding adjusting grooves respectively.

[0012] Preferably, draw bars are slidably mounted on the sides of the two mounting brackets away from each other. The ends of the two draw bars close to each other are fixedly connected to the corresponding connecting plates. Tightening springs are sleeved on the two draw bars. The ends of the two tightening springs close to each other are fixedly connected to the inner walls of the sides of the two mounting brackets away from each other. The ends of the two tightening springs away from each other are fixedly connected to the corresponding connecting plates. A connecting rod is rotatably mounted at the bottom of the first frame. Bevel gears are fixedly sleeved on the connecting rod and the bidirectional lead screw. The two bevel gears are meshed with each other. Two first cylinders are fixedly mounted on the inner wall of the top of the first frame. Anti-slip sheets are fixedly mounted on the output shafts of the two first cylinders. The two anti-slip sheets are in contact with the bidirectional lead screw.

[0013] Preferably, support columns are fixedly mounted on the tops of the two U-shaped frames one. Cross connecting plates are fixedly mounted at the tops of the two support columns. Slide plates one are slidably mounted on the two cross connecting plates. Second U-shaped frames are fixedly mounted at the bottoms of the two slide plates one. Two sponge wiping strips are fixedly mounted in each of the two second U-shaped frames. Slide plates two are slidably mounted on the two cross connecting plates. Boxes are fixedly mounted on the two slide plates two. One-way lead screws are slidably mounted in the two boxes. Lifting plates are threadedly mounted on the two one-way lead screws. Connecting columns are fixedly mounted at the bottoms of the two lifting plates. Contact pieces are fixedly mounted at the bottoms of the two connecting columns.

[0014] Preferably, second cylinders are fixedly mounted on the tops of the two cross connecting plates. The output shafts of the two second cylinders are fixedly connected to the corresponding slide plates one. Third cylinders are fixedly mounted on the tops of the two cross connecting plates. The output shafts of the two third cylinders are fixedly connected to the corresponding slide plates two. First motors are fixedly mounted on the tops of the two boxes. The output shafts of the two first motors are fixedly connected to the tops of the two one-way lead screws respectively.

[0015] Preferably, the two square bars 1 both penetrate the corresponding sliding plates and are slidably connected to the corresponding sliding plates, positioning grooves are provided at the bottoms of the two square bars 1, linkage plates are slidably installed on the two sliding plates, guide columns are slidably installed on the two linkage plates, wedge blocks are fixedly installed on the tops of the two guide columns, the tops of the two wedge blocks extend into the corresponding positioning grooves, and baffles are fixedly installed on the bottom ends of the two guide columns, compression springs are sleeved on the two guide columns, the tops of the two compression springs are fixedly connected to the corresponding linkage plates, and the bottom ends of the two compression springs They are fixedly connected to the corresponding baffles, a back plate is fixedly installed on the side of the two sliding plates away from each other, a rotating shaft is rotatably installed on the two back plates, a gear is fixedly sleeved on the two rotating shafts, a toothed bar is fixedly installed on the side of the two linkage plates away from each other, the two gears are meshed with the corresponding toothed bar, and a motor 2 is fixedly installed on one side of the two back plates, the output shafts of the two motors 2 are fixedly connected to one end of the corresponding rotating shaft, and an inclined sliding surface is provided on the side of the two square bars 1 that are close to each other, and the two inclined sliding surfaces are adapted to the corresponding wedge blocks.

[0016] The present invention also provides a film flattening method for a lithium battery separator production line, comprising the following steps: S1. Installation preparation: first fix the connecting seat at the middle position of the bottom of the workbench by bolts, and then install the square bar 1 and the sliding plate by bolts, so that the upper and lower flattening rollers are provided on both sides of the workbench; S2, width adjustment: start the output shafts of the two cylinders one to retract, so that the anti-skid sheet is separated from the bidirectional lead screw, then rotate the connecting rod, the bidirectional lead screw starts to rotate, and then the two sliding plates move towards each other, and finally adjust the distance between the two mold frames one to the specified value, then start the output shafts of the two cylinders one to extend, and use the anti-skid sheet to hold the bidirectional lead screw tightly; S3. Adjustment of the spacing between the lower flattening roller and the upper flattening roller: Turn one of the adjusting screws, and through the threaded cooperation between it and the corresponding forming frame, the corresponding connecting frame begins to rise, and the corresponding upper flattening roller also rises accordingly. When the corresponding adjusting mark moves to the specified position on the scale, it stops rotating, and the spacing adjustment of one set of the lower flattening roller and the upper flattening roller is completed. Then, according to the same steps, turn the other adjusting screw to adjust the spacing of the lower flattening roller and the upper flattening roller of the other set, and finally all adjustments are completed; S4, height adjustment: pull one of the pull rods to bring the corresponding embedded rod out of the corresponding adjustment slot. At this time, the corresponding tension spring is in a compressed state, and then the corresponding profile frame 1 is lifted up. When it is pulled to the specified height, release the pull rod, and the embedded rod is reinserted into the corresponding adjustment slot, thereby completing the height adjustment of the profile frame 1. Then, the height of the other profile frame 1 is adjusted in the same way; S5. Flattening treatment: The film is passed through the gap between the two sets of lower flattening rollers and the upper flattening roller, and is rolled up. During the rolling process, the film will not curl or wrinkle due to the matching gap between the lower flattening roller and the upper flattening roller, thereby improving the flatness after rolling up.

[0017] Compared with the related art, the film flattening device and method for lithium battery separator production line provided by the present invention has the following beneficial effects: The present invention provides a film flattening device and method for a lithium battery diaphragm production line. By means of the cooperation between a bidirectional lead screw and the threads between two sliding plates, the spacing between two groups of lower flattening rollers and upper flattening rollers can be adjusted, so that flattening work can be performed on films of different widths, and the scope of application is wide. Moreover, by means of the cooperation between the set adjusting screw and the scale and the starting mark and the adjusting mark, the spacing between the lower flattening roller and the upper flattening roller can be adaptively adjusted, so that flattening work can be performed on films of different thicknesses. In addition, by means of a square bar two that can be adjusted up and down, the overall height of a molding frame one can be adjusted, so that in actual use, the overall height of the lower flattening roller and the upper flattening roller can be adjusted according to the height of the film on the workbench so that they can be applied together, thereby further improving the applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the front structure of a first embodiment of a thin film flattening device for a lithium battery separator production line provided by the present invention; Figure 2 A bottom view structural schematic diagram of a first embodiment of a film flattening device for a lithium battery separator production line provided by the present invention; Figure 3 A schematic diagram of the rear view structure of a frame body 1 and two frame bodies 2 in the first embodiment of the thin film flattening device for a lithium battery separator production line provided by the present invention; Figure 4 A schematic diagram of the connection structure of the bidirectional lead screw and the sliding plate in the first embodiment of the film flattening device for a lithium battery separator production line provided by the present invention; Figure 5 A schematic diagram of the plug-in structure of the embedding rod and the adjusting groove in the first embodiment of the film flattening device for the lithium battery diaphragm production line provided by the present invention; Figure 6A schematic diagram of the connection structure of the first molding frame and the connecting frame in the first embodiment of the film flattening device for the lithium battery diaphragm production line provided by the present invention; Figure 7 A schematic diagram of the front structure of a second embodiment of a thin film flattening device for a lithium battery separator production line provided by the present invention; Figure 8 A schematic diagram of the connection structure of the first mold frame and the cross-connecting plate in the second embodiment of the thin film flattening device for a lithium battery separator production line provided by the present invention; Fig. 9 A schematic diagram of the three-dimensional connection structure of the support column and the cross-connecting plate in the second embodiment of the thin film flattening device for a lithium battery separator production line provided by the present invention; Fig.10 A schematic diagram of the side view of the connection structure of the support column and the cross-connecting plate in the second embodiment of the thin film flattening device for a lithium battery separator production line provided by the present invention; Fig.11 A schematic cross-sectional structural diagram of a box body in a second embodiment of a film flattening device for a lithium battery separator production line provided by the present invention; Fig.12 A schematic diagram of the three-dimensional structure of a third embodiment of a film flattening device for a lithium battery separator production line provided by the present invention; Fig.13 A schematic diagram of the connection structure of the sliding plate and the linkage plate in the third embodiment of the thin film flattening device for a lithium battery separator production line provided by the present invention; Fig.14 A bottom view structural schematic diagram of the middle strip 1 of the third embodiment of the thin film flattening device for a lithium battery separator production line provided by the present invention; Fig.15 A schematic cross-sectional structure diagram of a sliding plate and a linkage plate in a third embodiment of a film flattening device for a lithium battery separator production line provided by the present invention.

[0019] Numbers in the figure: 1, workbench; 2, connecting seat; 3, frame 1; 4, two-way lead screw; 5, sliding plate; 6, square bar 1; 7, frame 2; 8, profiling frame 1; 9, positioning rod 1; 10, lower flattening roller; 11, connecting frame; 12, positioning rod 2; 13, upper flattening roller; 14, adjusting screw; 15, scale; 16, starting mark; 17, adjusting mark; 18, square bar 2; 19, adjusting slot; 20, mounting frame; 21, pull plate; 22, embedded rod; 23, pull rod; 24, air Cylinder one; 25. Anti-skid sheet; 26. Support column; 27. Cross-connecting plate; 28. Slide plate one; 29. ​​Profile frame two; 30. Sponge wiping strip; 31. Slide plate two; 32. Box body; 33. One-way screw; 34. Lifting plate; 35. Connecting column; 36. Contact sheet; 37. Cylinder two; 38. Cylinder three; 39. Positioning groove; 40. Linkage plate; 41. Guide column; 42. Wedge block; 43. Block plate; 44. Compression spring; 45. Toothed strip; 46. Back plate; 47. Rotating shaft; 48. Gear. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0021] First embodiment: Please refer to Figure 1-Figure 6In the first embodiment of the present invention, a thin film flattening device for a lithium battery diaphragm production line includes: a connecting seat 2 fixed to the bottom of a workbench 1 by bolts, and a frame 3 is fixed at the bottom of the connecting seat 2, and the same bidirectional lead screw 4 is rotatably installed on the frame 3, and two sliding plates 5 are threadedly installed on it, and in order to ensure that the sliding plates 5 can only move linearly horizontally, limit rods are fixed on the outer walls of both sides of the frame 3, and the two limit rods penetrate the corresponding sliding plates 5 and are slidably connected to the corresponding sliding plates 5. In addition, a connecting rod is rotatably installed at the bottom of the frame 3, and the connecting rod and the bidirectional lead screw 4 are fixedly sleeved with bevel teeth, and the two bevel teeth are meshed with each other. By rotating the connecting rod, the bidirectional lead screw 4 can be driven to rotate through the meshing of the two bevel teeth, and a square bar 6 is provided on the side where the two sliding plates 5 are away from each other, and a frame 7 is fixed on the side where the two square bars 6 are away from each other, and a mold frame 8 is provided above the two frame 7, and the two A positioning rod 9 is fixed on the inner wall of the side away from each other of the two molding frames 8, and the two positioning rods 9 are rotatably sleeved with lower flattening rollers 10, and a connecting frame 11 is provided in the two molding frames 8, and a positioning rod 2 12 is fixed in the two connecting frames 11, and the two positioning rods 2 12 are rotatably sleeved with upper flattening rollers 13. Through the design of the lower flattening roller 10 and the upper flattening roller 13, the gap between the two can just allow the film to pass smoothly, thereby effectively avoiding the occurrence of curling and wrinkles. In order to be able to adjust the spacing between the upper flattening roller 13 and the lower flattening roller 10 to improve the applicability, adjusting screws 14 are threadedly installed on the top of the two molding frames 8, and the bottom ends of the two adjusting screws 14 are rotatably connected to the corresponding connecting frame 11. In addition, in order to ensure that the connecting frame 11 can only be lifted linearly, vertical poles are slidably installed on the top of the two molding frames 8, and the bottom ends of the two vertical poles are fixedly connected to the corresponding connecting frame 11.

[0022] In the above-mentioned manner, the two square bars 6 are fixedly connected to the corresponding sliding plates 5 by bolts to facilitate people to disassemble and assemble them.

[0023] In this method, in order to ensure that the distance between the lower flattening roller 10 and the upper flattening roller 13 can be adjusted finely, scale rulers 15 are fixed on the outer walls of the two C-shaped frames 8 on the sides away from each other, and two limit sleeves 1 are fixedly sleeved on each of the two positioning rods 9. The closer sides of the corresponding two limit sleeves 1 are in contact with the corresponding lower flattening roller 10, so as to prevent the lower flattening roller 10 from shifting. Starting benchmarks 16 are fixed on the two limit sleeves 1 away from each other. The two starting benchmarks 16 penetrate through the corresponding C-shaped frames 8 and are adapted to the corresponding scale rulers 15. The top end face of the starting benchmark 16 is flush with the top of the lower flattening roller 10 and points to the zero scale line position of the scale ruler 15. Limit sleeves 2 are fixedly sleeved on the two positioning rods 2. The closer sides of the corresponding two limit sleeves 2 are in contact with the corresponding upper flattening roller 13, so as to prevent the upper flattening roller 13 from shifting. Adjusting benchmarks 17 are fixed at the bottoms of the two connecting frames 11. The two adjusting benchmarks 17 penetrate through the corresponding C-shaped frames 8 and are movably connected to the corresponding C-shaped frames 8. The two adjusting benchmarks 17 are also adapted to the corresponding scale rulers 15. The bottom end face of the adjusting benchmark 17 is flush with the bottom of the upper flattening roller 13, so as to form a cooperation with the starting benchmark 16 to facilitate people to calculate the distance between the lower flattening roller 10 and the upper flattening roller 13.

[0024] In this method, in order to be able to adjust the overall height position of the C-shaped frame 8 so as to make an adaptive adjustment according to the actual height of the film on the workbench 1, square bars 2 are fixed at the bottoms of the two C-shaped frames 8, and the bottoms of the two square bars 2 extend into the corresponding second frames 7. The two square bars 2 are respectively slidably connected to the tops of the two second frames 7. Limit pieces are fixed at the bottoms of the two square bars 2 to prevent the square bars 2 from separating from the second frames 7. Moreover, a plurality of adjusting grooves 19 are formed on the sides away from each other of the two square bars 2. Mounting frames 20 are fixed on the outer walls of the two second frames 7 away from each other. Pulling plates 21 are slidably mounted on the two mounting frames 20. Insertion rods 22 are fixed at the tops of the two pulling plates 21. The closer ends of the two insertion rods 22 extend into the corresponding adjusting grooves 19. By inserting the insertion rods 22 into the adjusting grooves 19, the C-shaped frame 8 with adjusted height can be fixed at the specified height position.

[0025] In addition, in order to facilitate pulling the connecting plate 21, a pull rod 23 is slidably installed on the side of the two mounting frames 20 away from each other, and a pull ring is fixed on the end of the two pull rods 23 away from each other. During operation, fingers can be inserted into it for pulling, and the ends of the two pull rods 23 close to each other are fixedly connected to the corresponding connecting plate 21, and the two pull rods 23 are sleeved with a tightening spring, and the ends of the two tightening springs close to each other are respectively fixedly connected to the inner wall of the side of the two mounting frames 20 away from each other, and the ends of the two tightening springs away from each other are fixedly connected to the corresponding connecting plate 21, and the elastic top force and rebound force of the tightening spring are used to make the embedded rod 22 tightly inserted into the adjustment groove 19; In this embodiment, two cylinders 24 are fixed on the top inner wall of the frame 3, and anti-skid sheets 25 are fixed on the output shafts of the two cylinders 24. The two anti-skid sheets 25 are in contact with the bidirectional screw 4. The anti-skid sheets 25 are in contact with the smooth parts of the bidirectional screw 4, so as to prevent the connecting rod from naturally rotating, thereby ensuring that the sliding plate 5 can always be in the specified position.

[0026] In this embodiment: In the initial state, the output shafts of the two cylinders 24 are both in the extended state; When the film is being rolled up, in order to ensure its flatness, before rolling up, the connecting seat 2 can be fixed to the middle position of the bottom of the workbench 1 by bolts, and then the square bar 16 and the sliding plate 5 are bolted together, so that both sides of the workbench 1 have a lower flattening roller 10 and an upper flattening roller 13, and then the distance between the two molding frames 18 is adjusted according to the width of the workbench 1; When adjusting, first start the output shafts of the two cylinders 24 to retract, so that the anti-skid sheet 25 is separated from the bidirectional lead screw 4, then rotate the connecting rod, and the bidirectional lead screw 4 starts to rotate through the meshing between the two bevel teeth. At this time, through the threaded cooperation between the bidirectional lead screw 4 and the two sliding plates 5, the two sliding plates 5 move towards each other until the distance between the two mold frames 8 reaches the specified value, then stop rotating, and start the output shafts of the two cylinders 24 to extend, and use the anti-skid sheet 25 to hold the bidirectional lead screw 4 tightly. Then, according to the thickness of the film, the spacing between the corresponding lower flattening roller 10 and the upper flattening roller 13 is adjusted. During the adjustment, one of the adjusting screws 14 is turned, and through the threaded cooperation between the adjusting screw 14 and the corresponding shaped frame 8, the corresponding connecting frame 11 begins to rise. As the connecting frame 11 rises, the corresponding adjusting mark 17 also rises accordingly. At the same time, the corresponding upper flattening roller 13 also rises accordingly. At this time, by observing the position of the adjusting mark 17 on the scale 15, when the spacing between the adjusting mark 17 and the starting mark 16 reaches the specified standard, the adjusting screw 14 is stopped. In this way, the spacing adjustment of one group of lower flattening rollers 10 and upper flattening rollers 13 is completed. Then, according to the same steps, the other adjusting screw 14 is turned to adjust the spacing between the other group of lower flattening rollers 10 and upper flattening rollers 13. After all the adjustments are completed, it can be ensured that the film can just pass through. Then, according to the height of the film on the workbench 1, the flattening height of the lower flattening roller 10 and the upper flattening roller 13 is adjusted. When adjusting, first pull one of the pull rods 23. Driven by the pull rod 23, the connecting plate 21 will be pulled, thereby bringing the corresponding embedding rod 22 out of the corresponding adjustment groove 19. At this time, the corresponding tension spring is in a compressed state, and then the corresponding mold frame 8 is lifted up. When it is pulled to the specified height, the pull rod 23 can be loosened, and the compressed tension spring releases the elastic force, thereby bringing the embedding rod 22 back into the adjustment groove 19 of the specified height, thereby completing the height adjustment of the mold frame 8, and then the height of the other mold frame 8 is adjusted in the same way; After all the above adjustments are completed, the film can be passed through the gap between the two sets of lower flattening rollers 10 and the upper flattening rollers 13 and rolled up. During the rolling process, the appropriate spacing between the lower flattening rollers 10 and the upper flattening rollers 13 prevents the film from curling or wrinkling, thereby improving the flatness after rolling up and facilitating subsequent processing and use.

[0027] Compared with the related art, the film flattening device for lithium battery separator production line provided by the present invention has the following beneficial effects: In this embodiment, by means of the threaded cooperation between the bidirectional lead screw 4 and the two sliding plates 5, the spacing between the two groups of lower flattening rollers 10 and upper flattening rollers 13 can be adjusted, so that flattening work can be performed on films of different widths, and the scope of application is wide. In addition, by means of the coordinated use of the adjusting screw 14, the scale 15, the starting mark 16 and the adjusting mark 17, the spacing between the lower flattening roller 10 and the upper flattening roller 13 can be adaptively adjusted, so that flattening work can be performed on films of different thicknesses. In addition, by means of the square bar 18 that can be adjusted up and down, the overall height of the molding frame 8 can be adjusted, so that in actual use, the overall height of the lower flattening roller 10 and the upper flattening roller 13 can be adjusted according to the height of the film on the workbench 1, so that they can be applied together, thereby further improving the applicability.

[0028] Second embodiment: Based on the thin film flattening device for lithium battery separator production line provided in the first embodiment of the present application, the second embodiment of the present application proposes another thin film flattening device for lithium battery separator production line. The second embodiment is only a preferred method of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0029] The second embodiment of the present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0030] Please refer to Figure 7-Figure 11 The film flattening device for the lithium battery diaphragm production line also includes two support columns 26, the two support columns 26 are respectively fixed on the top of the two molded frames 8, and the tops of the two support columns 26 are fixed with cross-connecting plates 27, the two cross-connecting plates 27 are each provided with a sliding opening 1, and a sliding rod 1 is fixed in the two sliding openings 1, a slide plate 28 is slidably installed on the two sliding rods 1, and the slide plate 1 28 contacts the inner wall of the sliding opening 1, and the bottoms of the two slide plates 1 28 are fixed with a molded frame 29, and two sponge wiping strips 30 are fixed in the two molded frames 29, and the two cross-connecting plates 27 are each provided with a sliding opening 2, and in the two sliding openings 2 Both slide bars are fixed with slide bars 2, and slide plates 2 31 are slidably installed on both slide bars 2, and slide plates 2 31 are in contact with the inner wall of the slide mouth 2, and box bodies 32 are fixed on the two slide plates 2 31, and one-way screws 33 are slidably installed in the two box bodies 32, and lifting plates 34 are threadedly installed on the two one-way screws 33, and the lifting plates 34 are in contact with the inner wall of the box bodies 32 to form a limit, and connecting columns 35 are fixed to the bottom of the two lifting plates 34, and the bottom ends of the two connecting columns 35 are fixed with resistance sheets 36, which can resist the lower flattening roller 10 and the upper flattening roller 13, thereby driving the two to rotate through their rise.

[0031] In the above method, in order to drive the sponge strip 30 to contact the lower flattening roller 10 and the upper flattening roller 13, and to make the contact plate 36 contact the lower flattening roller 10 and the upper flattening roller 13, cylinder two 37 and cylinder three 38 are fixed on the top of the two cross-connecting plates 27, the output shafts of the two cylinder twos 37 are fixedly connected to the corresponding slide plate one 28, the output shafts of the two cylinder threes 38 are fixedly connected to the corresponding slide plate two 31, and the tops of the two box bodies 32 are fixedly connected to motor one, and the output shafts of the two motors one are respectively fixedly connected to the top ends of the two one-way screws 33.

[0032] In this embodiment: In the initial state, the output shafts of the two cylinders 38 are both in the extended state; When the film is flattened, in order to ensure the cleanliness of the lower flattening roller 10 and the upper flattening roller 13 to avoid contamination of the film, the two cylinders 2 37 can be started first, and the output shafts of the two cylinders 2 37 will extend, so that the two mold frames 2 29 move toward the corresponding mold frames 1 8, and finally the four sponge strips 30 respectively contact the two lower flattening rollers 10 and the two upper flattening rollers 13. Subsequently, the two motors 1 are started in the positive direction, and the output shafts of the two motors 1 will drive the corresponding one-way screws 33 to rotate. At this time, through the threaded cooperation between the one-way screw 33 and the lifting plate 34, the two connecting columns 35 are lowered, and at the same time, the two contact plates 36 are also lowered. After falling to the lowest position, the two motors 1 are turned off, and the output shafts of the two cylinders 38 are started to retract, and finally the two contact plates 36 respectively contact the corresponding lower flattening roller 10 and the upper flattening roller 13; Then, the two motors 1 are started in reverse, and the two lifting plates 34 begin to rise with the corresponding contact pieces 36. As the contact pieces 36 rise, the lower flattening roller 10 and the upper flattening roller 13 begin to rotate. During the rotation, the sponge strip 30 can scrape off the dust and impurities attached to them until the lifting plate 34 rises to the highest point. Then, the motor 1 is turned off, and the cleaning work of the lower flattening roller 10 and the upper flattening roller 13 is completed. Then, the output shaft of the cylinder 2 37 is started to retract, and the sponge strip 30 is brought back to its original position. The output shaft of the cylinder 3 38 is started to extend, and the contact piece 36 is brought back to its original position, and the film can continue to be flattened.

[0033] Third embodiment: Based on the thin film flattening device for lithium battery separator production line provided by the first and second embodiments of the present application, the third embodiment of the present application proposes another thin film flattening device for lithium battery separator production line. The third embodiment is only a preferred mode of the first and second embodiments, and the implementation of the third embodiment will not affect the independent implementation of the first or second embodiment.

[0034] The third embodiment of the present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0035] Please refer to Figure 12-Figure 15 In the third embodiment of the film flattening device for the lithium battery diaphragm production line proposed by the present invention: the two square bars 6 penetrate the corresponding sliding plates 5 and are slidably connected to the corresponding sliding plates 5, the bottoms of the two square bars 6 are provided with positioning grooves 39, and the two sliding plates 5 are provided with sliding openings 3, the two sliding openings 3 are fixed with sliding rods 3, the two sliding rods 3 are slidably installed with linkage plates 40, and the linkage plates 40 are in contact with the inner wall of the sliding openings 3, and the two linkage plates 40 are slidably installed with guide columns 41, the tops of the two guide columns 41 are fixed with wedge blocks 42, the tops of the two wedge blocks 42 extend into the corresponding positioning grooves 39, and the bottoms of the two guide columns 41 are fixed with blocking sheets 43, and the two guide columns 41 are A compression spring 44 is sleeved, the top ends of the two compression springs 44 are fixedly connected to the corresponding linkage plates 40, the bottom ends of the two compression springs 44 are fixedly connected to the corresponding baffles 43, a back plate 46 is fixed on the side of the two sliding plates 5 away from each other, a rotating shaft 47 is rotatably installed on the two back plates 46, and a gear 48 is fixedly sleeved on the two rotating shafts 47, a toothed bar 45 is fixed on the side of the two linkage plates 40 away from each other, the two gears 48 are meshed with the corresponding toothed bar 45, and a motor 2 is fixed on one side of the two back plates 46, the output shafts of the two motors 2 are fixedly connected to one end of the corresponding rotating shaft 47, and an inclined sliding surface is provided on the side of the two square bars 6 close to each other, and the two inclined sliding surfaces are adapted to the corresponding wedge blocks 42.

[0036] In this embodiment: When installing between the square bar 6 and the sliding plate 5, one of the square bars 6 is directly inserted into the corresponding sliding plate 5. During the insertion process, the inclined sliding surface on one side of the square bar 6 will cooperate with the inclined edge of the wedge block 42, so that the wedge block 42 can be pushed down and contact with the bottom of the square bar 6, and the compression spring 44 is in a compressed state at this time. Until the positioning groove 39 corresponds to the wedge block 42 up and down, the compressed compression spring 44 releases its elastic force and pushes the wedge block 42 into the positioning groove 39, so that the square bar 6 is clamped and fixed, and then the other square bar 6 is fixed in the same way; At a later stage, when it is necessary to separate the sliding plate 5 and the square bar 1 6 , the two motors 2 are directly started, and the output shafts of the two motors 2 drive the corresponding rotating shafts 47 to rotate, thereby driving the two gears 48 to rotate. At this time, through the engagement between the gear 48 and the toothed bar 45, the two toothed bars 45 can be brought down, and as the toothed bar 45 descends, under the downward pressure of the compression spring 44, the two guide columns 41 bring the corresponding wedge blocks 42 down, and finally bring the two wedge blocks 42 out of the corresponding positioning grooves 39, and then directly pull the two square bars 6 out of the corresponding sliding plate 5.

[0037] The present invention also provides a film flattening method for a lithium battery separator production line, comprising the following steps: S1. Installation preparation: first fix the connecting seat 2 to the middle position of the bottom of the workbench 1 by bolts, and then install the square bar 6 and the sliding plate 5 by bolts, so that the lower flattening roller 10 and the upper flattening roller 13 are provided on both sides of the workbench 1; S2, width adjustment: start the output shafts of the two cylinders 24 to retract, so that the anti-slip sheet 25 is separated from the bidirectional screw 4, then rotate the connecting rod, the bidirectional screw 4 starts to rotate, and then the two sliding plates 5 move towards each other, and finally adjust the distance between the two mold frames 8 to the specified value, and then start the output shafts of the two cylinders 24 to extend, and use the anti-slip sheet 25 to hold the bidirectional screw 4 tightly; S3, adjusting the spacing between the lower flattening roller 10 and the upper flattening roller 13: turning one of the adjusting screws 14, through the threaded cooperation between it and the corresponding mold frame 8, the corresponding connecting frame 11 begins to rise, and the corresponding upper flattening roller 13 also rises accordingly. When the corresponding adjusting mark rod 17 moves to the specified position on the scale 15, it stops rotating, and the spacing adjustment of one group of the lower flattening roller 10 and the upper flattening roller 13 is completed. Then, according to the same steps, turn another adjusting screw 14 to adjust the spacing of the other group of the lower flattening roller 10 and the upper flattening roller 13, and finally all adjustments are completed; S4, height adjustment: pull one of the pull rods 23 to bring the corresponding embedded rod 22 out of the corresponding adjustment slot 19. At this time, the corresponding tension spring is in a compressed state, and then the corresponding profile frame 8 is lifted up. When it is pulled to the specified height, release the pull rod 23, and the embedded rod 22 is reinserted into the corresponding adjustment slot 19, thereby completing the height adjustment of the profile frame 8. Then, the height of the other profile frame 8 is adjusted in the same way; S5, flattening treatment: the film is passed through the gap between the two sets of lower flattening rollers 10 and the upper flattening roller 13, and is rolled up. During the rolling process, the film will not have curling or wrinkles due to the adaptive gap between the lower flattening roller 10 and the upper flattening roller 13, thereby improving the flatness after rolling up.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A film flattening device for a lithium battery diaphragm production line, comprising a connecting seat fixedly mounted on the bottom of a workbench by bolts, characterized in that: A frame one is fixedly installed at the bottom of the connecting seat. The same bidirectional lead screw is rotatably installed on the frame one. Two sliding plates are threadedly installed on the bidirectional lead screw. Square bars one are arranged on the sides of the two sliding plates away from each other. Frame two are fixedly installed on the sides of the two square bars one away from each other. C-shaped frames one are arranged above the two frame two. Positioning rods one are fixedly installed on the inner walls of the sides of the two C-shaped frames one away from each other. Lower flattening rollers are rotatably sleeved on the two positioning rods one. Connecting frames are arranged in the two C-shaped frames one. Positioning rods two are fixedly installed in the two connecting frames. Upper flattening rollers are rotatably sleeved on the two positioning rods two. Adjusting screws are threadedly installed on the tops of the two C-shaped frames one. The bottom ends of the two adjusting screws are rotatably connected to the corresponding connecting frames respectively.

2. The thin film flattening device for a lithium battery separator production line according to claim 1, characterized in that: The two square bars one are fixedly connected to the corresponding sliding plates by bolts.

3. The thin film flattening device for a lithium battery separator production line according to claim 2, characterized in that: Scales are fixedly installed on the outer walls of the sides of the two C-shaped frames one away from each other. Two limiting sleeves one are fixedly sleeved on the two positioning rods one. The sides of the corresponding two limiting sleeves one close to each other are in contact with the corresponding lower flattening rollers. Starting benchmarks are fixedly installed on the two limiting sleeves one away from each other. The two starting benchmarks penetrate through the corresponding C-shaped frames one and are adapted to the corresponding scales. Limiting sleeves two are fixedly sleeved on the two positioning rods two. The sides of the corresponding two limiting sleeves two close to each other are in contact with the corresponding upper flattening rollers. Adjusting benchmarks are fixedly installed at the bottoms of the two connecting frames. The two adjusting benchmarks penetrate through the corresponding C-shaped frames one and are movably connected to the corresponding C-shaped frames one. The two adjusting benchmarks are both adapted to the corresponding scales.

4. The thin film flattening device for a lithium battery separator production line according to claim 3, characterized in that: Square bars two are fixedly installed at the bottoms of the two C-shaped frames one. The bottoms of the two square bars two extend into the corresponding frame two respectively. The two square bars two are respectively slidably connected to the tops of the two frame two.

5. The film flattening device for a lithium battery separator production line according to claim 4, characterized in that: A plurality of adjusting grooves are formed on the sides of the two square bars two away from each other. Mounting frames are fixedly installed on the outer walls of the sides of the two frame two away from each other. Pulling plates are slidably installed on the two mounting frames. Embedding rods are fixedly installed at the tops of the two pulling plates. The ends of the two embedding rods close to each other extend into the corresponding adjusting grooves.

6. The film flattening device for a lithium battery separator production line according to claim 5, characterized in that: Pulling rods are slidably installed on the outer walls of the sides of the two mounting frames away from each other. The ends of the two pulling rods close to each other are fixedly connected to the corresponding pulling plates respectively. Tightening springs are sleeved on the two pulling rods. The ends of the two tightening springs close to each other are fixedly connected to the inner walls of the sides of the two mounting frames away from each other respectively. The ends of the two tightening springs away from each other are both fixedly connected to the corresponding pulling plates. A connecting rod is rotatably installed at the bottom of the frame one. Bevel gears are fixedly sleeved on the connecting rod and the bidirectional lead screw respectively. The two bevel gears are meshed with each other. Two air cylinders one are fixedly installed on the inner wall of the top of the frame one. Anti-slip sheets are fixedly installed on the output shafts of the two air cylinders one. The two anti-slip sheets are both in contact with the bidirectional lead screw.

7. The film flattening device for a lithium battery separator production line according to claim 1, characterized in that: Support columns are fixedly installed at the tops of the two U-shaped frames I. Cross connecting plates are fixedly installed at the tops of the two support columns. Slide plates I are slidably installed on the two cross connecting plates. C-shaped frames II are fixedly installed at the bottoms of the two slide plates I. Two sponge wiping strips are fixedly installed in each of the two C-shaped frames II. Slide plates II are slidably installed on the two cross connecting plates. Boxes are fixedly installed on the two slide plates II. One-way lead screws are slidably installed in the two boxes. Lifting plates are threadedly installed on the two one-way lead screws. Connecting columns are fixedly installed at the bottoms of the two lifting plates.抵触片 is fixedly installed at the bottom end of each of the two connecting columns.

8. The film flattening device for a lithium battery separator production line according to claim 7, characterized in that: Cylinders II are fixedly installed at the tops of the two cross connecting plates. Output shafts of the two cylinders II are fixedly connected to the corresponding slide plates I. Cylinders III are fixedly installed at the tops of the two cross connecting plates. Output shafts of the two cylinders III are fixedly connected to the corresponding slide plates II. Motors I are fixedly installed at the tops of the two boxes. Output shafts of the two motors I are fixedly connected to the tops of the two one-way lead screws respectively.

9. The film flattening device for a lithium battery separator production line according to claim 1, characterized in that: The two square bars I penetrate through the corresponding sliding plates and are slidably connected to the corresponding sliding plates. Positioning grooves are formed at the bottoms of the two square bars I. Linking plates are slidably installed on the two sliding plates. Guide columns are slidably installed on the two linking plates. Wedge-shaped blocks are fixedly installed at the tops of the two guide columns. The tops of the two wedge-shaped blocks extend into the corresponding positioning grooves. Flap pieces are fixedly installed at the bottom ends of the two guide columns. Compression springs are sleeved on the two guide columns. The tops of the two compression springs are fixedly connected to the corresponding linking plates. The bottoms of the two compression springs are fixedly connected to the corresponding flap pieces. Back plates are fixedly installed on the sides of the two sliding plates away from each other. Shafts are rotatably installed on the two back plates. Gears are fixedly sleeved on the two shafts. Tooth bar strips are fixedly installed on the sides of the two linking plates away from each other. The two gears are meshed with the corresponding tooth bar strips. Motors II are fixedly installed on one side of each of the two back plates. Output shafts of the two motors II are fixedly connected to one ends of the corresponding shafts. Inclined sliding surfaces are provided on the sides of the two square bars I close to each other. The two inclined sliding surfaces are adapted to the corresponding wedge-shaped blocks.

10. A method for using the film flattening device for a lithium battery separator production line according to claim 6, characterized in that: It includes the following steps: S1. Installation preparation: First, fix the connecting seat at the middle position of the bottom of the workbench through bolts. Then, install the square bar I and the sliding plate through bolts, so that lower flattening rollers and upper flattening rollers are provided above both sides of the workbench. S2. Width adjustment: Start to retract the output shafts of the two cylinders I, so that the anti-slip pieces are separated from the bidirectional lead screw. Then rotate the connecting rod, and the bidirectional lead screw starts to rotate. Immediately, the two sliding plates move towards each other. Finally, adjust the distance between the two U-shaped frames I to the specified value. Then start to extend the output shafts of the two cylinders I, and use the anti-slip pieces to firmly hold the bidirectional lead screw. S3. Adjustment of the spacing between the lower flattening roller and the upper flattening roller: Turn one of the adjusting screws, and through the threaded cooperation between it and the corresponding forming frame, the corresponding connecting frame begins to rise, and the corresponding upper flattening roller also rises accordingly. When the corresponding adjusting mark moves to the specified position on the scale, it stops rotating, and the spacing adjustment of one set of the lower flattening roller and the upper flattening roller is completed. Then, according to the same steps, turn the other adjusting screw to adjust the spacing of the lower flattening roller and the upper flattening roller of the other set, and finally all adjustments are completed; S4, height adjustment: pull one of the pull rods to bring the corresponding embedded rod out of the corresponding adjustment slot. At this time, the corresponding tension spring is in a compressed state, and then the corresponding profile frame 1 is lifted up. When it is pulled to the specified height, release the pull rod, and the embedded rod is reinserted into the corresponding adjustment slot, thereby completing the height adjustment of the profile frame 1. Then, the height of the other profile frame 1 is adjusted in the same way; S5. Flattening treatment: The film is passed through the gap between the two sets of lower flattening rollers and the upper flattening roller, and is rolled up. During the rolling process, the film will not curl or wrinkle due to the matching gap between the lower flattening roller and the upper flattening roller, thereby improving the flatness after rolling up.

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