A diaphragm double-coating double-dispensing production line
By designing a diaphragm dual-coating and dual-spraying production line, the equipment structure is simplified, production efficiency and lithium battery performance consistency are improved, and the problems of large equipment footprint, high maintenance costs and high energy consumption in existing technologies are solved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KATOP AUTOMATION CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-06-30
Smart Images
Figure CN224423282U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery production technology, specifically to a separator double-coating and double-spraying production line. Background Technology
[0002] In lithium battery production, ceramic coating and PVDF (polyvinylidene fluoride) spraying of the separator are usually completed using a separator coating production line.
[0003] Existing diaphragm coating production lines generally include double-sided coating production lines and double-sided spraying production lines. These lines are arranged side-by-side with a turning mechanism between them. The double-sided coating production line includes an unwinding mechanism for unwinding the diaphragm, a preheating oven for preheating the diaphragm, an A-side coating mechanism for coating ceramic slurry onto side A of the diaphragm (e.g., the front side) to form a ceramic slurry layer, a first oven for heating and drying the ceramic slurry layer on side A of the diaphragm, a B-side coating mechanism for coating ceramic slurry onto side B of the diaphragm (e.g., the back side) to form a ceramic slurry layer, and a mechanism for... The double-sided coating production line includes a second drying oven for heating and drying the B-side ceramic slurry layer, a process traction mechanism for pulling the diaphragm, an A-side spraying mechanism for spraying PVDF coating onto the A-side ceramic slurry layer of the diaphragm to form an A-side coating layer, a third drying oven for heating and drying the A-side coating layer of the diaphragm, a B-side spraying mechanism for spraying PVDF coating onto the B-side ceramic slurry layer of the diaphragm to form a B-side coating layer, a fourth drying oven for heating and drying the B-side coating layer of the diaphragm, and a winding mechanism for winding the diaphragm. A turning mechanism is used to turn the diaphragm so that it can enter the process traction mechanism after exiting the second drying oven.
[0004] The above structure has the following disadvantages:
[0005] 1. The double-sided coating production line is equipped with two coating mechanisms and two drying ovens, and the double-sided spraying production line is equipped with two spraying mechanisms and two drying ovens. Furthermore, a turning mechanism is configured between the double-sided coating production line and the double-sided spraying line. The structure is complex, the equipment occupies a large area, and the equipment maintenance cost is high.
[0006] 2. The two production lines require two membrane insertions and four heating and drying processes, which reduces production speed and efficiency, increases energy consumption, and the turning process can easily cause the diaphragm to wrinkle or scratch.
[0007] 3. When coating or spraying the A and B sides of the separator in stages, the thickness of the ceramic slurry layer or coating layer on both sides of the separator is often inconsistent due to temperature fluctuations in the oven or deviations in equipment parameters, which affects the consistency of lithium battery performance. Utility Model Content
[0008] To overcome the shortcomings of existing technologies, this utility model provides a diaphragm dual-coating and dual-spraying production line, which reduces the equipment's floor space, lowers equipment maintenance costs, improves production efficiency, reduces energy consumption, and can prevent diaphragm wrinkles or scratches, while ensuring the consistency of lithium battery performance.
[0009] The technical solution adopted by this utility model to solve its technical problem is:
[0010] A diaphragm double-coating and double-spraying production line includes an unwinding mechanism, a preheating oven, a double-coating mechanism, a first oven, a double-spraying mechanism, a second oven, and a winding mechanism arranged sequentially along the diaphragm's travel path. The unwinding mechanism is used to unwind the diaphragm; the preheating oven is used to preheat the diaphragm; the double-coating mechanism is used to coat ceramic slurry onto surface A and surface B of the diaphragm to form surface A ceramic slurry layer and surface B ceramic slurry layer, respectively; the first oven is used to heat and dry the surface A and surface B ceramic slurry layer of the diaphragm; the double-spraying mechanism is used to spray PVDF coating onto the surface A and surface B ceramic slurry layer of the diaphragm to form surface A coating layer and surface B coating layer, respectively; the second oven is used to heat and dry the surface A and surface B coating layer of the diaphragm; and the winding mechanism is used to wind the diaphragm.
[0011] As a preferred technical solution, the dual-coating mechanism includes a coating frame and an A-side gravure roller, a proximity roller, an A-side fabric box, a B-side gravure roller, and a B-side fabric box disposed on the coating frame. One end of the A-side gravure roller is connected to an A-side coating motor disposed on the coating frame. The A-side gravure roller is partially located in a first material trough of the A-side fabric box. The A-side fabric box has a first feed inlet communicating with the first material trough. The proximity roller is located above the A-side gravure roller and can move towards or away from the A-side gravure roller. The B-side gravure roller is located above the proximity roller. One end of the B-side gravure roller is connected to a B-side coating motor disposed on the coating frame. The B-side gravure roller is partially located in a second material trough of the B-side fabric box. The B-side fabric box has a second feed inlet communicating with the second material trough.
[0012] As a preferred technical solution, the dual-coating mechanism further includes a first coating roller, a second coating roller, a first coating adsorption roller, a first coating arc roller, a second coating adsorption roller, a second coating arc roller, and a third coating roller disposed on the coating frame. The first coating roller is located below the A-side gravure roller. The second coating roller, the first coating adsorption roller, and the first coating arc roller are sequentially disposed between the first coating roller and the A-side gravure roller along the travel path of the diaphragm. The second coating adsorption roller, the second coating arc roller, and the third coating roller are sequentially disposed between the A-side gravure roller and the B-side gravure roller along the travel path of the diaphragm.
[0013] As a preferred technical solution, the dual-spray mechanism includes a spray frame and an A-side sprayer, a B-side sprayer, a first spraying roller, a second spraying roller, a third spraying roller, and an air-floating roller mounted on the spray frame. The A-side sprayer is located above the B-side sprayer, the first spraying roller is located below the B-side sprayer, the second spraying roller is positioned between the first spraying roller and the B-side sprayer along the diaphragm's travel path, the third spraying roller is positioned between the B-side sprayer and the A-side sprayer along the diaphragm's travel path, and the air-floating roller is located above the A-side sprayer.
[0014] As a preferred technical solution, it further includes an unwinding tension adjusting mechanism disposed between the unwinding mechanism and the preheating oven along the travel path of the diaphragm. The unwinding tension adjusting mechanism is used to adjust the tension of the diaphragm. Both the unwinding tension adjusting mechanism and the unwinding mechanism are disposed at the top of the unwinding base. The unwinding mechanism includes an unwinding frame disposed at the top of the unwinding base, an unwinding turret disposed on the unwinding frame, and two unwinding shafts. The unwinding turret is connected to an unwinding turret motor disposed on the unwinding frame. The two unwinding shafts are respectively disposed on the unwinding turret and are symmetrical about the center of the unwinding turret. One end of each unwinding shaft is connected to an unwinding motor disposed on the unwinding turret. The unwinding tension adjusting mechanism includes an unwinding tension adjusting frame disposed at the top of the unwinding base and an unwinding tension swing roller disposed on the unwinding tension adjusting frame.
[0015] As a preferred technical solution, it further includes a first traction mechanism disposed between the preheating oven and the double coating mechanism along the travel path of the diaphragm. The first traction mechanism is used to flatten and traction the diaphragm. The first traction mechanism includes a first traction frame and a first traction arc-shaped roller and a first traction adsorption roller disposed sequentially on the first traction frame along the travel path of the diaphragm.
[0016] As a preferred technical solution, it further includes a second traction mechanism disposed between the first oven and the double-spray mechanism along the diaphragm's travel path, and a third traction mechanism disposed between the second oven and the winding mechanism. The second traction mechanism and the third traction mechanism are used to correct and pull the diaphragm, respectively. Both the second traction mechanism and the third traction mechanism include a second traction frame and a traction adjustment roller and a second traction adsorption roller disposed sequentially on the second traction frame along the diaphragm's travel path. The second traction adsorption roller is located below the traction adjustment roller.
[0017] As a preferred technical solution, both the second traction mechanism and the third traction mechanism include a first traction roller, a second traction roller, a third traction roller, a traction tension swing roller, a fourth traction roller, a second traction arc roller, and a fifth traction roller disposed on the second traction frame. The first traction roller, the second traction roller, the third traction roller, the traction tension swing roller, the fourth traction roller, and the second traction arc roller are sequentially disposed between the traction adjustment roller and the second traction adsorption roller along the travel path of the diaphragm, and the fifth traction roller is located below the second traction adsorption roller.
[0018] As a preferred technical solution, it further includes a winding tension adjusting mechanism disposed between the third traction mechanism and the winding mechanism along the travel path of the diaphragm. The winding tension adjusting mechanism is used to adjust the tension of the diaphragm. Both the winding tension adjusting mechanism and the winding mechanism are disposed at the top of the winding base. The winding mechanism includes a winding frame disposed at the top of the winding base, a winding turret disposed on the winding frame, and two winding shafts. The winding turret is connected to a winding turret motor disposed on the winding frame. The two winding shafts are respectively disposed on the winding turret and are symmetrical about the center of the winding turret. One end of each winding shaft is connected to a winding motor disposed on the winding turret. The winding tension adjusting mechanism includes a winding tension adjusting frame disposed at the top of the winding base and a winding tension swing roller disposed on the winding tension adjusting frame.
[0019] As a preferred technical solution, the winding tension adjustment mechanism further includes a first winding guide roller, a second winding guide roller, a third winding guide roller, a fourth winding guide roller, a winding arc roller, and a fifth winding guide roller disposed on the winding tension adjustment frame. The first winding guide roller is located below the winding tension swing roller. The second winding guide roller is disposed between the first winding guide roller and the winding tension swing roller along the diaphragm's travel path. The third winding guide roller, the fourth winding guide roller, the winding arc roller, and the fifth winding guide roller are sequentially disposed between the winding tension swing roller and the winding mechanism along the diaphragm's travel path.
[0020] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model has the following advantages through the setting of the unwinding mechanism, preheating oven, double coating mechanism, first drying oven, double spraying mechanism, second drying oven and winding mechanism;
[0021] 1. This utility model does not require a steering mechanism, and it uses a dual-coating mechanism to replace the existing A-side coating mechanism and B-side coating mechanism, and a dual-spraying mechanism to replace the existing A-side spraying mechanism and B-side spraying mechanism. At the same time, the number of ovens is reduced to two, which simplifies the structure, reduces the equipment's footprint, and lowers the equipment's maintenance costs.
[0022] 2. This utility model only requires one membrane insertion and two heating and drying processes, which improves production speed, increases production efficiency, and reduces energy consumption. Furthermore, the diaphragm does not need to be rotated, thus avoiding wrinkles or scratches on the diaphragm.
[0023] 3. In this invention, after coating or spraying the A and B sides of the separator, the ceramic slurry layer on the A side and the ceramic slurry layer on the B side of the separator, or the coating layer on the A side and the coating layer on the B side of the separator, are heated and dried in an oven. This prevents the ceramic slurry layer or coating layer on both sides of the separator from being inconsistent in thickness due to temperature fluctuations in the oven or deviations in equipment parameters, thus ensuring the consistency of lithium battery performance. Attached Figure Description
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0025] Figure 1 This is a schematic diagram of the structure of a diaphragm double-coating and double-spraying production line according to an embodiment of the present invention;
[0026] Figure 2 yes Figure 1 The diagram shows the structure of the unwinding mechanism and the unwinding tension adjustment mechanism of the diaphragm double coating and double spraying production line.
[0027] Figure 3 yes Figure 1 The diagram shows the structure of the preheating oven in the diaphragm double coating and double spraying production line.
[0028] Figure 4 yes Figure 1 The diagram shows the structure of the first traction mechanism and the double coating mechanism of the diaphragm double coating and double spraying production line.
[0029] Figure 5 yes Figure 1 A schematic diagram of the structure of the first drying oven in the diaphragm double-coating and double-spraying production line shown;
[0030] Figure 6 yes Figure 1 The diagram shows the structure of the second traction mechanism and the double spraying mechanism of the diaphragm double coating and double spraying production line.
[0031] Figure 7 yes Figure 1 The diagram shows the structure of the winding tension adjustment mechanism and the winding mechanism of the diaphragm double coating and double spraying production line.
[0032] Figure label:
[0033] 1. Unwinding base; 2. Rewinding base;
[0034] 10. Unwinding mechanism; 11. Unwinding frame; 12. Unwinding turret; 130. Unwinding shaft;
[0035] 20. Unwinding tension adjustment mechanism; 21. Unwinding tension adjustment frame; 22. Unwinding tension swing roller; 23. Unwinding adjustment guide roller; 24. First unwinding guide roller; 25. Second unwinding guide roller; 26. Third unwinding guide roller;
[0036] 30. Preheating oven; 31. Preheating chamber body; 32. Lower conveyor roller; 33. Upper conveyor roller; 34. Preheating roller;
[0037] 40. First traction mechanism; 41. First traction frame; 42. First traction arc-shaped roller; 43. First traction adsorption roller;
[0038] 50. Dual-coating mechanism; 51. Coating rack; 52. A-side gravure roller; 53. Approach roller; 54. A-side fabric box; 541. First material trough; 55. B-side gravure roller; 56. B-side fabric box; 561. Second material trough; 571. First coating roller; 572. Second coating roller; 573. Third coating roller; 581. First coating adsorption roller; 582. Second coating adsorption roller; 591. First coating arc roller; 592. Second coating arc roller;
[0039] 60. First drying oven; 61. Drying chamber; 62. Lower hull; 63. Upper hull; 64. Lower vent; 65. Upper vent;
[0040] 70. Second traction mechanism; 71. Second traction frame; 72. Traction adjustment roller; 73. Second traction adsorption roller; 741. First traction roller; 742. Second traction roller; 743. Third traction roller; 744. Fourth traction roller; 745. Fifth traction roller; 75. Traction tension swing roller; 76. Second traction arc roller;
[0041] 80. Dual spraying mechanism; 81. Spraying frame; 82. A-side spraying machine; 83. B-side spraying machine; 84. First spraying roller; 85. Second spraying roller; 86. Third spraying roller; 87. Air-float roller;
[0042] 90. Second drying oven;
[0043] 100. Third traction mechanism;
[0044] 110. Winding tension adjustment mechanism; 1101. Winding tension adjustment frame; 1102. Winding tension swing roller; 1103. First winding guide roller; 1104. Second winding guide roller; 1105. Third winding guide roller; 1106. Fourth winding guide roller; 1107. Winding arc roller; 1108. Fifth winding guide roller;
[0045] 120. Rewinding mechanism; 1201. Rewinding frame; 1202. Rewinding turret; 1203. Rewinding shaft. Detailed Implementation
[0046] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.
[0047] Please refer to Figure 1 An embodiment of this utility model provides a diaphragm double-coating and double-spraying production line, including an unwinding mechanism 10, an unwinding tension adjusting mechanism 20, a preheating oven 30, a first traction mechanism 40, a double-coating mechanism 50, a first oven 60, a second traction mechanism 70, a double-spraying mechanism 80, a second oven 90, a third traction mechanism 100, a winding tension adjusting mechanism 110, and a winding mechanism 120 arranged sequentially from left to right along the diaphragm's travel path.
[0048] Combination Figure 2 As shown, the unwinding mechanism 10 is used to unwind the diaphragm, and the unwinding tension adjustment mechanism 20 is used to adjust the tension of the diaphragm to avoid the diaphragm from breaking. Both the unwinding tension adjustment mechanism 20 and the unwinding mechanism 10 are located at the top of the unwinding base 1.
[0049] The unwinding mechanism 10 includes an unwinding frame 11 mounted on the top of the unwinding base 1, an unwinding turret 12 mounted on the unwinding frame 11, and two unwinding shafts 13. The unwinding turret 12 is connected to an unwinding turret motor mounted on the unwinding frame 11. The two unwinding shafts 13 are respectively mounted on the unwinding turret 12 and are symmetrical about the center of the unwinding turret 12. One end of the unwinding shaft 13 is connected to the unwinding motor mounted on the unwinding turret 12. The unwinding turret motor drives the unwinding turret 12 to rotate, thereby driving the two unwinding shafts 13 to rotate around the center of the unwinding turret 12 to switch between work positions, thus realizing roll changing. The unwinding motor drives the unwinding shafts 13 to rotate, thereby realizing the unwinding of the diaphragm. In practical applications, for ease of description, the two unwinding shafts 13 are respectively named the first unwinding shaft 13 and the second unwinding shaft 13. For example, the first roll and the second roll with the diaphragm are first installed on the first unwinding shaft 13 and the second unwinding shaft 13 respectively. Then, the diaphragm on the first roll is unwound through the first unwinding shaft 13. When the diaphragm on the first roll is almost unwound, the first unwinding shaft 13 and the second unwinding shaft 13 are driven to rotate around the center of the unwinding turret 12 to switch the working positions. Then, the traveling diaphragm is pressed tightly against the adhesive part of the diaphragm on the second roll and then cut. This completes the tape splicing. Then, the diaphragm on the second roll can be unwound through the second unwinding shaft 13.
[0050] The unwinding tension adjustment mechanism 20 includes an unwinding tension adjustment frame 21 disposed at the top of the unwinding base 1 and an unwinding tension swing roller 22 disposed on the unwinding tension adjustment frame 21. The tension of the diaphragm can be adjusted by moving the unwinding tension swing roller 22 left and right.
[0051] Furthermore, the unwinding tension adjustment mechanism 20 also includes an unwinding adjustment roller 23, a first unwinding roller 24, a second unwinding roller 25, and a third unwinding roller 26 disposed on the unwinding tension adjustment frame 21. The unwinding adjustment roller 23 and the first unwinding roller 24 are disposed sequentially between the unwinding mechanism 10 and the unwinding tension swing roller 22 along the diaphragm's travel path, while the second unwinding roller 25 and the third unwinding roller 26 are disposed sequentially between the unwinding tension swing roller 22 and the preheating oven 30 along the diaphragm's travel path. In practical applications, after the diaphragm is unwound by the unwinding mechanism 10, the diaphragm passes sequentially over the unwinding adjustment roller 23, under the first unwinding roller 24, to the right of the unwinding tension swing roller 22, to the left of the second unwinding roller 25, and under the third unwinding roller 26. The tension of the diaphragm can be adjusted by the unwinding tension swing roller 22. For example, when the tension of the diaphragm decreases, the unwinding tension swing roller 22 moves to the right, which increases the tension of the diaphragm. When the tension of the diaphragm increases, the unwinding tension swing roller 22 moves to the left, which decreases the tension of the diaphragm. The front and rear positions of the diaphragm can be adjusted by the unwinding adjustment roller 23 to correct the diaphragm deviation. The first unwinding roller 24, the second unwinding roller 25, and the third unwinding roller 26 can support and guide the diaphragm respectively.
[0052] Combination Figure 3As shown, the preheating oven 30 is used to preheat the diaphragm to flatten it, preventing wrinkles and improving its quality. The preheating oven 30 is a hot air oven, including a preheating chamber 31. The preheating chamber 31 has openings at both ends for the diaphragm to enter and exit. The preheating chamber 31 contains multiple upper conveying rollers 33, multiple lower conveying rollers 32, and a lower hull for conveying the diaphragm. The upper conveying rollers 33 are located above the lower conveying rollers 32 and are staggered vertically. The number of upper and lower conveying rollers 33 can be adjusted according to actual needs. The lower hull is located below the lower conveying rollers 32, and its top has a mesh that communicates with the interior of the lower hull. Hot air can be blown through the mesh to preheat the diaphragm. The preheating chamber 31 is equipped with an air inlet, which is connected to a hot air blower via a first pipe and to the interior of the lower hull via a second pipe. A preheating roller 34 is located at one end of the preheating chamber 31. In practical applications, the diaphragm first passes over the preheating roller 34, then enters the preheating chamber 31 through an opening at one end, passes over multiple lower conveyor rollers 32 and multiple upper conveyor rollers 33, and then exits through an opening at the other end of the preheating chamber 31. The preheating roller 34 supports and guides the diaphragm, while the rotation of the multiple upper conveyor rollers 33 and multiple lower conveyor rollers 32 facilitates diaphragm transport. Hot air generated by the hot air blower enters the lower hull through the air inlet of the preheating chamber 31 and is then blown out through the mesh of the lower hull, thus preheating the diaphragm. The upper conveyor rollers 33 and lower conveyor rollers 32 are the same type of roller.
[0053] Understandably, the preheating oven can also be other types of ovens, such as infrared ovens.
[0054] Combination Figure 4 As shown, the first traction mechanism 40 is used to flatten and pull the diaphragm. Flattening the diaphragm avoids wrinkles and improves its quality. Pulling the diaphragm improves the stability of the diaphragm belt.
[0055] The first traction mechanism 40 includes a first traction frame 41 and a first traction arc-shaped roller 42 and a first traction adsorption roller 43, which are sequentially arranged from left to right on the first traction frame 41 along the diaphragm's travel path. In practical applications, after the diaphragm exits through the opening at the other end of the preheating oven 31, the diaphragm passes under the first traction arc-shaped roller 42 and over the first traction adsorption roller 43 in sequence. The first traction arc-shaped roller 42 can flatten the diaphragm, and the first traction adsorption roller 43 can adsorb and pull the diaphragm to improve the stability of the diaphragm's travel.
[0056] The dual-coating mechanism 50 is used to coat ceramic slurry onto the A side (e.g., the front side) and B side (e.g., the back side) of the diaphragm to form an A side ceramic slurry layer and a B side ceramic slurry layer. The dual-coating mechanism 50 includes a coating frame 51 and an A side gravure roller 52, a proximity roller 53, an A side fabric box 54, a B side gravure roller 55, and a B side fabric box 56, all mounted on the coating frame 51. One end of the A side gravure roller 52 is connected to an A side coating motor mounted on the coating frame 51, which drives the A side gravure roller 52 to rotate. Part of the A side gravure roller 52 is located within the first feed trough 541 of the A side fabric box 54, which is tilted to the right and has a first feed inlet communicating with the first feed trough 541. The approach roller 53 is located above the A-side gravure roller 52 and can move towards or away from the A-side gravure roller 52. By moving the approach roller 53 towards the A-side gravure roller 52, the diaphragm can be pressed onto the A-side gravure roller 52. In this embodiment, there are two approach rollers 53, arranged side by side. The B-side gravure roller 55 is located above the approach roller 53. One end of the B-side gravure roller 55 is connected to the B-side coating motor mounted on the coating rack 51. The B-side coating motor drives the B-side gravure roller 55 to rotate. The B-side gravure roller 55 is partially located in the second material trough 561 of the B-side material box 56. The B-side material box 56 is tilted to the left and has a second feed port communicating with the second material trough 561. Both the first feed port and the second feed port are used to connect to the feeding equipment.
[0057] Furthermore, the dual-coating mechanism 50 also includes a first coating roller 571, a second coating roller 572, a first coating adsorption roller 581, a first coating arc roller 591, a second coating adsorption roller 582, a second coating arc roller 592, and a third coating roller 573 disposed on the coating frame 51. The first coating roller 571 is located below the A-side gravure roller 52. The second coating roller 572, the first coating adsorption roller 581, and the first coating arc roller 591 are sequentially disposed between the first coating roller 571 and the A-side gravure roller 52 along the diaphragm's travel path. The second coating adsorption roller 582, the second coating arc roller 592, and the third coating roller 573 are sequentially disposed between the A-side gravure roller 52 and the B-side gravure roller 55 along the diaphragm's travel path.
[0058] In practical applications, the diaphragm first passes under the first coating roller 571, then to the left of the second coating roller 572, then to the right of the first coating adsorption roller 581, and then above the first coating curved roller 591. It then passes between the A-side gravure roller 52 and the approach roller 53, and then passes to the left of the second coating adsorption roller 582, then to the left of the second coating curved roller 592, then above the third coating roller 573, and finally above the B-side gravure roller 55. The first, second, and third coating rollers 571 and 572 support and guide the diaphragm respectively. The first and second coating adsorption rollers 581 and 582 adsorb the diaphragm to break its tension, thus facilitating coating of the A and B sides of the diaphragm. The first and second coating curved rollers 591 and 582... 592 can flatten the diaphragm separately to avoid wrinkles and improve its quality. The ceramic slurry can be fed into the first material tank 541 of the A-side material box 54 through the first feed port and into the second material tank 561 of the B-side material box 56 through the second feed port. The approach roller 53 moves towards the A-side gravure roller 52, thereby pressing the diaphragm onto the A-side gravure roller 52. The A-side gravure roller 52 is driven to rotate by the A-side gravure roller motor, thereby carrying up the ceramic slurry in the first material tank 541 and coating it onto the A-side of the diaphragm to form an A-side ceramic slurry layer. The B-side gravure roller 55 is driven to rotate by the B-side gravure roller motor, thereby carrying up the ceramic slurry in the second material tank 561 and coating it onto the B-side of the diaphragm to form a B-side ceramic slurry layer.
[0059] Combination Figure 5As shown, the first oven 60 is used to heat and dry the ceramic slurry layers on side A and side B of the diaphragm. In this embodiment, the first oven 60 is a hot air oven. Understandably, the first oven 60 can also be other types of ovens, such as infrared ovens. The first oven 60 includes a drying chamber 61 with openings at both ends for the diaphragm to enter and exit the drying chamber 61. The drying chamber 61 is provided with a plurality of heating components spaced apart along the length of the drying chamber 61. The number of heating components can be set according to actual conditions. The heating components include a lower hull 62 and an upper hull 63 arranged vertically opposite each other. A plurality of lower air nozzles 64 and a plurality of upper air nozzles 65 are respectively provided on the side of the lower hull 62 and the upper hull 63 that are close to each other. The plurality of lower air nozzles 64 and the plurality of upper air nozzles 65 are staggered vertically. Several downwind nozzles 64 are connected to the interior of the lower hull 62, and several upwind nozzles 65 are connected to the interior of the upper hull 63. The number of downwind nozzles 64 and upwind nozzles 65 can be set according to actual conditions. The downwind nozzles 64 are used to blow hot air onto the B side of the diaphragm to heat and dry the ceramic slurry layer on the B side of the diaphragm, and the upwind nozzles 65 are used to blow hot air onto the A side of the diaphragm to heat and dry the ceramic slurry layer on the A side of the diaphragm. The drying chamber 61 is provided with a lower air inlet and an upper air inlet. The lower air inlet and the upper air inlet are connected to the hot air blower through the first pipe and the second pipe, respectively. The lower air inlet is connected to the interior of the lower hull 62 through the third pipe, and the upper air inlet is connected to the interior of the upper hull 63 through the fourth pipe. In practical applications, the diaphragm enters the drying chamber 61 through the opening at one end of the drying chamber 61, passes between several lower air nozzles 64 and several upper air nozzles 65, and then exits through the opening at the other end of the drying chamber 61. The hot air generated by the hot air blower can enter the lower hull 62 and the upper hull 63 through the lower air inlet and the upper air inlet of the drying chamber 61, respectively, and then be blown out through several lower air nozzles 64 and several upper air nozzles 65. In this way, the B-side ceramic slurry layer and the A-side ceramic slurry layer of the diaphragm can be heated and dried.
[0060] Combination Figure 6 As shown, the second traction mechanism 70 is used to correct and pull the diaphragm. By correcting the diaphragm, the accuracy of its front and rear positions can be ensured. By pulling the diaphragm, the stability of the diaphragm belt can be improved. The second traction mechanism 70 includes a second traction frame 71 and a traction adjusting roller 72 and a second traction adsorption roller 73, which are sequentially arranged on the second traction frame 71 along the diaphragm's travel path. The second traction adsorption roller 73 is located below the traction adjusting roller 741.
[0061] Furthermore, the second traction mechanism 70 also includes a first traction roller 741, a second traction roller 742, a third traction roller 743, a traction tension swing roller 75, a fourth traction roller 744, a second traction arc roller 76, and a fifth traction roller 745, all disposed on the second traction frame 71. The first traction roller 741, the second traction roller 742, the third traction roller 743, the traction tension swing roller 75, the fourth traction roller 744, and the second traction arc roller 76 are sequentially arranged between the traction adjustment roller 741 and the second traction adsorption roller 73 along the diaphragm's travel path, and the fifth traction roller 745 is located below the second traction adsorption roller 73.
[0062] In practical applications, the diaphragm passes sequentially from below the traction adjusting roller 72, below the first traction roller 741, above the second traction roller 742, to the right of the third traction roller 743, to the left of the traction tension swing roller 75, below the fourth traction roller 744, below the second traction arc roller 76, above the second traction adsorption roller 73, and below the fifth traction roller 745. The traction adjusting roller 2 allows for adjustment of the diaphragm's front and rear positions to correct its deviation. The first traction roller 741, second traction roller 742, and third traction roller 744... 3. The fourth traction roller 744 and the fifth traction roller 745 can support and guide the diaphragm respectively. By moving the traction tension swing roller 75 left and right, the tension of the diaphragm can be adjusted. For example, when the tension of the diaphragm decreases, the traction tension swing roller 75 moves to the left, which increases the tension of the diaphragm. When the tension of the diaphragm increases, the traction tension swing roller 75 moves to the right, which decreases the tension of the diaphragm. The second traction arc roller 76 can flatten the diaphragm to avoid wrinkles and improve the quality of the diaphragm. The second traction adsorption roller 745 can adsorb and pull the diaphragm.
[0063] The dual-spray mechanism 80 is used to spray PVDF (polyvinylidene fluoride) coating onto the A-side ceramic slurry layer and the B-side ceramic slurry layer of the diaphragm to form the A-side coating layer and the B-side coating layer, respectively. The dual-spray mechanism 80 includes a spray frame 81 and, mounted on the spray frame 81, an A-side sprayer 82, a B-side sprayer 83, a first spraying roller 84, a second spraying roller 85, a third spraying roller 86, and an air-float roller 87. The A-side sprayer 82 is located above the B-side sprayer 83, the first spraying roller 84 is located below the B-side sprayer 83, the second spraying roller 85 is positioned along the diaphragm's travel path between the first spraying roller 84 and the B-side sprayer 83, the third spraying roller 86 is positioned along the diaphragm's travel path between the B-side sprayer 83 and the A-side sprayer 82, and the air-float roller 87 is located above the A-side sprayer 82. In practical applications, the diaphragm first passes under the first spraying roller 84, then to the right of the second spraying roller 85, then to the left of the B-side spraying machine 83, then to the right of the third spraying roller 86, then to the right of the A-side spraying machine 82, and finally to the left of the air-float roller 87. The first spraying roller 84, the second spraying roller 85, and the third spraying roller 86 can support and guide the diaphragm respectively, while the air-float roller 87 can suspend and support the diaphragm, so that the B-side spraying machine 83 and the A-side spraying machine 82 can perform spraying work respectively. Moreover, by using the air-float roller 87, contact with the diaphragm can be avoided, ensuring the spraying quality. The B-side spraying machine 83 and the A-side spraying machine 82 can spray PVDF coating onto the B-side ceramic slurry layer and the A-side ceramic slurry layer of the diaphragm respectively to form the B-side coating layer and the A-side coating layer.
[0064] The second oven 90 is used to heat and dry the coating layers on side A and side B of the diaphragm. The structure of the second oven 90 is the same as that of the first oven 60, and will not be described again here. The third traction mechanism 100 is used for correcting and traction of the diaphragm. Correcting the diaphragm ensures the accuracy of its front and rear positions, and traction improves the stability of the diaphragm belt. The structure of the third traction mechanism 100 is the same as that of the second traction mechanism 70, and will not be described again here.
[0065] Combination Figure 7 As shown, the winding tension adjustment mechanism 110 is used to adjust the tension of the diaphragm to avoid diaphragm breakage, and the winding mechanism 120 is used to wind up the diaphragm. Both the winding tension adjustment mechanism 110 and the winding mechanism 120 are located at the top of the winding base 2.
[0066] The winding tension adjustment mechanism 110 includes a winding tension adjustment frame 1101 disposed at the top of the winding base 2 and a winding tension swing roller 1102 disposed on the winding tension adjustment frame 1101. The tension of the diaphragm can be adjusted by moving the winding tension swing roller 1102 left and right.
[0067] Furthermore, the winding tension adjustment mechanism 110 also includes a first winding guide roller 1103, a second winding guide roller 1104, a third winding guide roller 1105, a fourth winding guide roller 1106, a winding arc roller 1107, and a fifth winding guide roller 1108 disposed on the winding tension adjustment frame 1101. The first winding guide roller 1103 is located below the winding tension swing roller 1102. The second winding guide roller 1104 is disposed between the first winding guide roller 1103 and the winding tension swing roller 1102 along the travel path of the diaphragm. The third winding guide roller 1105, the fourth winding guide roller 1106, the winding arc roller 1107, and the fifth winding guide roller 1108 are sequentially disposed between the winding tension swing roller 1102 and the winding mechanism 120 along the travel path of the diaphragm. In practical applications, the diaphragm passes sequentially from below the first take-up roller 1103, to the right of the second take-up roller 1104, to the left of the take-up tension roller 1102, below the third take-up roller 1105, above the fourth take-up roller 1106, above the take-up curved roller 1107, and below the fifth take-up roller 1108, passing through the first take-up roller 1103, second take-up roller 1104, third take-up roller 1105, fourth take-up roller 1106, and fifth take-up roller 1108. The five take-up rollers 1108 can support and guide the diaphragm respectively. The tension of the diaphragm can be adjusted by the take-up tension swing roller 1102. For example, when the tension of the diaphragm decreases, the take-up tension swing roller 1102 moves to the left, which increases the tension of the diaphragm. When the tension of the diaphragm increases, the take-up tension swing roller 1102 moves to the right, which decreases the tension of the diaphragm. The take-up curved roller 1107 can flatten the diaphragm to avoid wrinkles and improve the quality of the diaphragm.
[0068] The winding mechanism 120 includes a winding frame 1201 mounted on the top of the winding base 2, a winding turret 1202 mounted on the winding frame 1201, and two winding shafts 1203. The winding turret 1202 is connected to a winding turret motor mounted on the winding frame 1201. The two winding shafts 1203 are respectively mounted on the winding turret 1202 and are symmetrical about the center of the winding turret 1202. One end of each winding shaft 1203 is connected to the winding motor mounted on the winding turret 1202. The winding turret motor drives the winding turret 1202 to rotate, thereby causing the two winding shafts 1203 to rotate around the center of the winding turret 1202 to switch between work positions, thus enabling roll changing. The winding motor drives the winding shafts 1203 to rotate, thereby enabling the winding of the diaphragm. In practical applications, for ease of description, the two take-up shafts 1203 are respectively named the first take-up shaft 1203 and the second take-up shaft 1203. For example, two empty first rolls and second rolls are first installed on the first take-up shaft 1203 and the second take-up shaft 1203 respectively. Then, the diaphragm is wound up by the first take-up shaft 1203 so that the diaphragm is wound around the first roll. When the first roll is almost full, the first take-up shaft 1203 and the second take-up shaft 1203 are driven to rotate around the center of the take-up turret 1202 to switch the working positions. Then, the traveling diaphragm is pressed tightly against the adhesive position on the second roll and then cut. This completes the tape splicing. Then, the diaphragm can be wound up by the second take-up shaft 1203 so that the diaphragm is wound around the second roll.
[0069] This utility model, through the arrangement of an unwinding mechanism 10, a preheating oven 30, a double-coating mechanism 50, a first drying oven 60, a double-spraying mechanism 80, a second drying oven 90, and a winding mechanism 120, allows the unwinding mechanism 10 to unwind the diaphragm, the preheating oven 30 to preheat the diaphragm, the double-coating mechanism 50 to coat ceramic slurry onto surface A and surface B of the diaphragm to form ceramic slurry layers on surfaces A and B, respectively, and the first drying oven 60 to heat the diaphragm. The A-side ceramic slurry layer and the B-side ceramic slurry layer are heated and dried. PVDF coating is then sprayed onto the A-side and B-side ceramic slurry layers of the diaphragm using a dual-spray mechanism 80 to form the A-side coating layer and the B-side coating layer, respectively. The A-side and B-side coating layers of the diaphragm are then heated and dried using a second drying oven 90. Finally, the diaphragm is wound up using a winding mechanism 120. This completes the coating process for the diaphragm. Compared to existing technologies, firstly, this invention does not require… To achieve this, a steering mechanism is required, and a dual-coating mechanism 50 is used instead of the existing A-side coating mechanism and B-side coating mechanism, and a dual-spraying mechanism 80 is used instead of the existing A-side spraying mechanism and B-side spraying mechanism. Simultaneously, the number of ovens is reduced to two, simplifying the structure, reducing the equipment's footprint, and lowering maintenance costs. Secondly, this invention only requires one membrane insertion and two heating and drying processes, increasing production speed and efficiency, reducing energy consumption, and eliminating the need for membrane steering, thus preventing wrinkles or scratches. Thirdly, this invention first coats or sprays the A-side and B-side of the membrane, then uses an oven to heat and dry the A-side ceramic slurry layer, B-side ceramic slurry layer, or A-side coating layer and B-side coating layer of the membrane. This prevents inconsistent thickness of the ceramic slurry layer or coating layer on both sides of the membrane due to oven temperature fluctuations or equipment parameter deviations, ensuring consistent lithium battery performance.
[0070] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A diaphragm double-coat double-die production line characterized by, The diaphragm includes an unwinding mechanism, a preheating oven, a double-coating mechanism, a first oven, a double-spraying mechanism, a second oven, and a winding mechanism arranged sequentially along the diaphragm's travel path. The unwinding mechanism is used to unwind the diaphragm; the preheating oven is used to preheat the diaphragm; the double-coating mechanism is used to coat ceramic slurry onto the A-side and B-side of the diaphragm to form a ceramic slurry layer on the A-side and a ceramic slurry layer on the B-side; the first oven is used to heat and dry the ceramic slurry layers on the A-side and B-side of the diaphragm; the double-spraying mechanism is used to spray PVDF coating onto the ceramic slurry layers on the A-side and B-side of the diaphragm to form a coating layer on the A-side and a coating layer on the B-side; the second oven is used to heat and dry the coating layers on the A-side and B-side of the diaphragm; and the winding mechanism is used to wind the diaphragm.
2. The diaphragm double-coat double-die production line of claim 1, wherein, The dual-coating mechanism includes a coating frame and an A-side gravure roller, a proximity roller, an A-side fabric box, a B-side gravure roller, and a B-side fabric box, all mounted on the coating frame. One end of the A-side gravure roller is connected to an A-side coating motor mounted on the coating frame. The A-side gravure roller is partially located in a first feed trough of the A-side fabric box, which has a first feed inlet communicating with the first feed trough. The proximity roller is located above the A-side gravure roller and can move towards or away from it. The B-side gravure roller is located above the proximity roller. One end of the B-side gravure roller is connected to a B-side coating motor mounted on the coating frame. The B-side gravure roller is partially located in a second feed trough of the B-side fabric box, which has a second feed inlet communicating with the second feed trough.
3. The diaphragm dual-coating and dual-spraying production line according to claim 2, characterized in that, The dual-coating mechanism further includes a first coating roller, a second coating roller, a first coating adsorption roller, a first coating arc roller, a second coating adsorption roller, a second coating arc roller, and a third coating roller disposed on the coating frame. The first coating roller is located below the A-side gravure roller. The second coating roller, the first coating adsorption roller, and the first coating arc roller are sequentially disposed between the first coating roller and the A-side gravure roller along the travel path of the diaphragm. The second coating adsorption roller, the second coating arc roller, and the third coating roller are sequentially disposed between the A-side gravure roller and the B-side gravure roller along the travel path of the diaphragm.
4. The diaphragm dual-coating and dual-spraying production line according to claim 1, characterized in that, The dual-spray mechanism includes a spray frame and an A-side sprayer, a B-side sprayer, a first spraying roller, a second spraying roller, a third spraying roller, and an air-float roller mounted on the spray frame. The A-side sprayer is located above the B-side sprayer, the first spraying roller is located below the B-side sprayer, the second spraying roller is positioned between the first spraying roller and the B-side sprayer along the diaphragm's travel path, the third spraying roller is positioned between the B-side sprayer and the A-side sprayer along the diaphragm's travel path, and the air-float roller is located above the A-side sprayer.
5. The diaphragm dual-coating and dual-spraying production line according to claim 1, characterized in that, It also includes an unwinding tension adjusting mechanism disposed between the unwinding mechanism and the preheating oven along the travel path of the diaphragm. The unwinding tension adjusting mechanism is used to adjust the tension of the diaphragm. Both the unwinding tension adjusting mechanism and the unwinding mechanism are disposed at the top of the unwinding base. The unwinding mechanism includes an unwinding frame disposed at the top of the unwinding base, an unwinding turret disposed on the unwinding frame, and two unwinding shafts. The unwinding turret is connected to an unwinding turret motor disposed on the unwinding frame. The two unwinding shafts are respectively disposed on the unwinding turret and are symmetrical about the center of the unwinding turret. One end of the unwinding shaft is connected to the unwinding motor disposed on the unwinding turret. The unwinding tension adjustment mechanism includes an unwinding tension adjustment frame disposed at the top of the unwinding base and an unwinding tension swing roller disposed on the unwinding tension adjustment frame.
6. The diaphragm dual-coating and dual-spraying production line according to claim 1, characterized in that, It also includes a first traction mechanism disposed between the preheating oven and the double coating mechanism along the travel path of the diaphragm, the first traction mechanism being used to flatten and traction the diaphragm; The first traction mechanism includes a first traction frame and a first traction arc-shaped roller and a first traction adsorption roller sequentially arranged on the first traction frame along the travel path of the diaphragm.
7. The diaphragm double-coating and double-spraying production line according to claim 1, characterized in that, It also includes a second traction mechanism disposed between the first oven and the double-spray mechanism along the diaphragm's travel path, and a third traction mechanism disposed between the second oven and the winding mechanism. The second traction mechanism and the third traction mechanism are used to correct and pull the diaphragm, respectively. Both the second traction mechanism and the third traction mechanism include a second traction frame and a traction adjustment roller and a second traction adsorption roller disposed sequentially on the second traction frame along the diaphragm's travel path. The second traction adsorption roller is located below the traction adjustment roller.
8. The diaphragm dual-coating and dual-spraying production line according to claim 7, characterized in that, Both the second and third traction mechanisms include a first traction roller, a second traction roller, a third traction roller, a traction tension swing roller, a fourth traction roller, a second traction arc roller, and a fifth traction roller, all mounted on the second traction frame. The first traction roller, the second traction roller, the third traction roller, the traction tension swing roller, the fourth traction roller, and the second traction arc roller are sequentially arranged between the traction adjustment roller and the second traction adsorption roller along the diaphragm's travel path. The fifth traction roller is located below the second traction adsorption roller.
9. The diaphragm double-coating and double-spraying production line according to claim 7, characterized in that, It also includes a winding tension adjustment mechanism disposed between the third traction mechanism and the winding mechanism along the travel path of the diaphragm. The winding tension adjustment mechanism is used to adjust the tension of the diaphragm. Both the winding tension adjustment mechanism and the winding mechanism are disposed at the top of the winding base. The winding mechanism includes a winding frame disposed at the top of the winding base, a winding turret disposed on the winding frame, and two winding shafts. The winding turret is connected to a winding turret motor disposed on the winding frame. The two winding shafts are respectively disposed on the winding turret and are symmetrical about the center of the winding turret. One end of the winding shaft is connected to the winding motor disposed on the winding turret. The winding tension adjustment mechanism includes a winding tension adjustment frame disposed at the top of the winding base and a winding tension swing roller disposed on the winding tension adjustment frame.
10. The diaphragm dual-coating and dual-spraying production line according to claim 9, characterized in that, The winding tension adjustment mechanism further includes a first winding guide roller, a second winding guide roller, a third winding guide roller, a fourth winding guide roller, a winding arc roller, and a fifth winding guide roller disposed on the winding tension adjustment frame. The first winding guide roller is located below the winding tension swing roller. The second winding guide roller is disposed between the first winding guide roller and the winding tension swing roller along the diaphragm's travel path. The third winding guide roller, the fourth winding guide roller, the winding arc roller, and the fifth winding guide roller are sequentially disposed between the winding tension swing roller and the winding mechanism along the diaphragm's travel path.