Tension compensation mechanism for lithium ion battery diaphragm
By designing a tension compensation mechanism for lithium-ion battery separators and using angle adjustment rollers and an electronic control system to adjust the membrane surface tension in real time, problems such as large tension fluctuations and roller stalling during coating production were solved, thereby improving product quality and production stability.
Patent Information
- Application Number
- CN202510964949.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-14
- Publication Date
- 2025-09-26
AI Technical Summary
During the production process of lithium-ion battery separator coating, when the extreme difference in film roll tension is large and the tension fluctuation is large, it cannot be corrected in time, resulting in a decrease in film surface quality and unstable product quality.
A lithium-ion battery separator tension compensation mechanism was designed, which included an angle adjustment roller, a tension detection roller, a tension adjustment roller, and an electric cylinder system. The real-time detection and adjustment of the membrane surface tension was achieved through a lead screw assembly and a slide rail limit block, and dynamic regulation was performed using a tension sensor and an electronic control system.
It effectively reduces the extreme value range of film roll tension, improves the running stability of the film surface, reduces the errors of defect detection and surface density measurement, improves the accuracy and efficiency of product quality judgment, and avoids the problem of roller stall.
Smart Images
Figure CN120698281A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of lithium-ion battery diaphragms, and in particular to a lithium-ion battery diaphragm tension compensation mechanism. Background Art
[0002] At present, the tension control of lithium-ion battery coating production lines is basically segmented control. Conventional equipment can be roughly divided into four to five sections of independent tension control. Independent tension control means that the tension control is more sensitive. Independent tension sections are usually separated by equipment components such as adsorption rollers and rubber pressure rollers. The independent tension control of each section mainly relies on the tension swing roller to adjust the film surface tension. The commonly used method is to push or pull back the tension swing roller through an airbag cylinder to adjust the tension.
[0003] Coating lines are segmented equipment. The friction generated by the wrapping angle between the film surface and the rollers across a wide span drives the rollers. The magnitude of this friction and the smoothness of the rollers' operation also affect the fluctuations in the independent tension within each section of the line. At the end of the line, the winding equipment typically uses constant tension or torque control to wind the coated film rolls. The film surface quality grade is measured and assessed using defect detectors and surface density meters. The stability of the tension at the front end of the winding equipment is crucial for determining quality grade and also impacts the quality of the coated and slit products.
[0004] Unstable film surface tension can lead to internal squeezing or loosening of the wound film, resulting in poor quality finished products, wrinkling, uneven ends, varying tightness, and winding deviation, reducing the yield of coated products. Excessively large tension variations can also affect the subsequent slitting process, lowering the final product's A-ratio. Furthermore, large, uncorrected tension fluctuations can cause the film surface to vibrate violently, preventing defect detectors and surface density meters from measuring or distorting the data, further impacting product quality.
[0005] Therefore, the inventor provides a lithium-ion battery diaphragm tension compensation mechanism. Summary of the Invention
[0006] (1) Technical problems to be solved The embodiment of the present invention provides a lithium-ion battery diaphragm tension compensation mechanism, which solves the technical problem that in the lithium-ion battery diaphragm coating production process, when the film roll tension extreme difference value is large and the tension fluctuation is large, correction cannot be made in time.
[0007] (2) Technical solution The present invention provides a lithium-ion battery diaphragm tension compensation mechanism, comprising a mechanism vertical plate, a mechanism bottom plate, a supporting beam, an angle adjustment roller, a tension detection roller, a fixed roller, a tension adjustment roller, a tension adjustment roller electric cylinder and a screw assembly; the two mechanism vertical plates are respectively installed on opposite sides of the mechanism bottom plate, and the two mechanism vertical plates are connected by a plurality of supporting beams, the two ends of the plurality of angle adjustment rollers are respectively slidably connected to the two mechanism vertical plates and are used to perform lifting and lowering movements under the drive of the screw assembly, the two ends of the plurality of fixed rollers are respectively connected to the two mechanism vertical plates and are used to transfer the membrane surface, the two ends of the plurality of tension adjustment rollers are respectively slidably connected to the two mechanism vertical plates and are used to perform lifting and lowering movements under the drive of the tension adjustment roller electric cylinder to adjust the tension of the membrane surface, and the tension detection roller is installed on the mechanism vertical plate and is used to detect the tension of the membrane surface.
[0008] Furthermore, the lithium-ion battery diaphragm tension compensation mechanism also includes a slider, a first slide rail, a slide rail limit block, and an adjusting roller bearing pedestal; the two ends of the angle adjustment roller are respectively installed on the corresponding adjusting roller bearing pedestals, the adjusting roller bearing pedestals are fixedly connected to the slider, the slider is slidably connected to the first slide rail, the first slide rail is fixed to the mechanism vertical plate along the vertical direction, the slide rail limit block is located at the lower end of the first slide rail and is used to limit the slider; the screw assembly is connected to the adjusting roller bearing pedestal and drives the slider and the adjusting roller bearing pedestal to perform synchronous lifting and lowering movements.
[0009] Furthermore, the slide rail limiting block is provided with a groove, and the first slide rail is installed in the groove.
[0010] Furthermore, the screw assembly includes a nut and a screw rod, the nut is sleeved on the screw rod and is used to perform lifting and lowering movements under the drive of the screw rod, one end of the screw rod is passed through the slide rail limit block, and the slide rail limit block is provided with a fastener for locking the screw rod.
[0011] Furthermore, the lithium-ion battery diaphragm tension compensation mechanism also includes a tension sensor, a tension sensor bracket and a tension roller bearing seat; the tension sensor is installed on the tension sensor bracket, the tension sensor bracket is fixedly connected to the mechanism vertical plate, the tension detection roller is installed on the tension sensor through the tension roller bearing seat, the tension sensor is in contact with the tension detection roller and is used to obtain tension data and transmit the tension data to the tension adjustment roller electric cylinder.
[0012] Furthermore, the lithium-ion battery diaphragm tension compensation mechanism also includes a roller connecting fixed ring, a bearing pedestal, a tension adjustment roller bearing and a second slide rail. The two ends of the tension adjustment roller are respectively installed on one end of the corresponding bearing pedestal through bearings, and the other end of the bearing pedestal is rollingly installed in the second slide rail through the tension adjustment roller bearing. The piston rod of the tension adjustment roller electric cylinder is connected to the bearing pedestal through the roller connecting fixed ring and is used to drive the bearing pedestal to move along the second slide rail. The second slide rail is fixed to the mechanism vertical plate.
[0013] Furthermore, threaded holes are provided at both ends of the bearing seat, one end of the bearing seat is provided with a mounting port for placing the tension adjustment roller, and the other end of the bearing seat has a connecting shaft, and the tension adjustment roller bearing is sleeved on the connecting shaft and moves synchronously.
[0014] Furthermore, the lithium-ion battery diaphragm tension compensation mechanism also includes a fixed roller bearing pedestal, and both ends of the fixed roller are respectively installed on the corresponding fixed roller bearing pedestals through bearings, and the fixed roller bearing pedestals are fixed to the mechanism vertical plate.
[0015] Furthermore, the angle adjustment roller includes a first part, a second part and a third part that are connected to each other, the second part and the third part are respectively located at the two ends of the first part, the second part and the third part are both mesh structures, and the surface of the third part is provided with multiple engraved lines in opposite directions of the thread lines.
[0016] Furthermore, the mesh structure is made of rubber or silicone.
[0017] (3) Beneficial effects In summary, the present invention compensates for film surface tension through the use of tension-adjusting rollers, resolving the issues of large tension variations and the inability to promptly correct large tension fluctuations during the lithium-ion separator coating production process. This effectively addresses the issue of tension imbalance and difficulty adjusting tension at the tension boundary. Furthermore, the angle-adjusting rollers are utilized to adjust the angle between the roller and the film surface, addressing issues such as roller stalling caused by unstable tension or collapsed edges of the substrate film roll. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0019] Figure 1 This is a structural axial view of a lithium-ion battery diaphragm tension compensation mechanism provided by an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure enlargement at point A; Figure 3 This is a top view of the structure of a lithium-ion battery diaphragm tension compensation mechanism provided by an embodiment of the present invention; Figure 4 This is a structural diagram of a lithium-ion battery diaphragm tension compensation mechanism in a working state provided by an embodiment of the present invention; Figure 5 yes Figure 4 A magnified schematic diagram of the structure at point B in FIG. Figure 6 This is a structural schematic diagram of a slide rail limit block in a lithium-ion battery diaphragm tension compensation mechanism provided by an embodiment of the present invention; Figure 7 This is a structural schematic diagram of an adjusting roller bearing pedestal in a lithium-ion battery diaphragm tension compensation mechanism provided by an embodiment of the present invention; Figure 8 This is a structural diagram of a roller connecting a fixing ring in a lithium-ion battery diaphragm tension compensation mechanism provided by an embodiment of the present invention; Figure 9 It is a structural schematic diagram of a bearing pedestal in a lithium-ion battery diaphragm tension compensation mechanism provided by an embodiment of the present invention.
[0020] In the picture: 1-mechanism vertical plate; 2-mechanism bottom plate; 3-support beam; 4-angle adjustment roller; 5-tension detection roller; 6-fixed roller; 7-tension adjustment roller; 8-tension adjustment roller electric cylinder; 9-screw assembly; 901-nut; 902-screw; 10-slider; 11-first slide rail; 12-slide rail limit block; 13-adjustment roller bearing seat; 14-tension sensor; 15-tension sensor bracket; 16-tension roller bearing seat; 17-roller connecting fixing ring; 18-bearing seat; 1801-installation port; 1802-connecting shaft; 19-tension adjustment roller bearing; 20-second slide rail; 21-fixed roller bearing seat; 100-membrane surface. DETAILED DESCRIPTION
[0021] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are intended to illustrate the principles of the present invention and are not intended to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments and covers any modifications, replacements, and improvements to the parts, components, and connection methods without departing from the spirit of the present invention.
[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present invention are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.
[0024] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed" and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.
[0025] Figure 1 This is a schematic diagram of the structure of a lithium-ion battery diaphragm tension compensation mechanism provided by an embodiment of the present invention, see Figure 1 The compensation mechanism may include a mechanism upright plate 1, a mechanism bottom plate 2, a supporting crossbeam 3, an angle adjustment roller 4, a tension detection roller 5, a fixed roller 6, a tension adjustment roller 7, a tension adjustment roller electric cylinder 8, and a screw assembly 9. The two mechanism upright plates 1 are respectively mounted on opposite sides of the mechanism bottom plate 2 and connected by a plurality of supporting crossbeams 3. The ends of the plurality of angle adjustment rollers 4 are respectively slidably connected to the two mechanism upright plates 1 and are used to move up and down under the drive of the screw assembly 9. The ends of the plurality of fixed rollers 6 are respectively connected to the two mechanism upright plates 1 and are used to transfer the film surface 100. The ends of the plurality of tension adjustment rollers 7 are respectively slidably connected to the two mechanism upright plates 1 and are used to move up and down under the drive of the tension adjustment roller electric cylinder 8 to adjust the tension of the film surface 100. The tension detection roller 5 is mounted on the mechanism upright plate 1 and is used to detect the tension of the film surface 100.
[0026] In a specific application scenario, such as Figures 1 to 5As shown, there are two vertical plates 1 and two base plates 2, each with four supporting beams 3. The two vertical plates 1 are mounted on their corresponding base plates 2 to form the entire structure. The two vertical plates 1 are connected by evenly distributed supporting beams 3. Each supporting beam 3 has four through-holes, which are bolted to the two vertical plates 1 to complete the structure. The two base plates 2 each have six anchor bolt holes, and the base plates 2 can be installed in place using expansion bolts or chemical anchors. There are also two angle adjustment rollers 4, located diagonally on the surface of the vertical plates 1, staggered vertically. The two angle adjustment rollers 4 are the first and last rollers that the film surface 100 contacts when entering the tension compensation mechanism, thereby completing the winding of the film surface 100. There are three tension adjustment rollers 7 and seven fixed rollers 6. These seven fixed rollers 6 work together to transfer the film surface 100 and, to a certain extent, stabilize the movement and tension of the film surface 100. It should be noted here that there is no limitation on the specific number of the mechanism upright plate 1, the mechanism base plate 2, the supporting beam 3, the angle adjustment roller 4, the tension detection roller 5, the fixed roller 6, the tension adjustment roller 7, the tension adjustment roller electric cylinder 8 and the screw assembly 9, and they can be adjusted according to actual conditions.
[0027] Specifically, the angle adjustment roller 4 includes a first part, a second part and a third part that are interconnected, the second part and the third part are respectively located at the two ends of the first part, the first part, the second part and the third part are an integrated structure, and the surfaces of the first part, the second part and the third part are provided with corresponding functional layers; wherein, the surfaces of the second part and the third part are both mesh structures (grooves are provided along the axial and radial directions of the roller body), and the surface of the first part is provided with multiple grooves facing each other in the direction of the thread line. The two ends of the angle adjustment roller 4 (i.e., the second and third parts) adopt a mesh structure, which is mainly used to regulate the membrane surface by extending the membrane edge to solve the problems of looseness and collapsed edges at both ends of the normal width membrane produced by the production line and the shaking and loosening of the membrane surface when producing a wide width membrane surface, so as to avoid problems such as unstable overall tension of the membrane surface, wrinkles in the middle, and membrane surface deviation caused by the looseness of the membrane surface on both sides. The mesh structure is a grid-like functional layer laid on the surface of the second and third parts. The material is EPDM rubber, urethane rubber or silicone. Antistatic agents can be added during the forming process of the mesh structure to reduce the generation of static electricity on the membrane surface during actual use, and ensure service life and low maintenance costs while providing sufficient friction. The middle portion (i.e., the first portion) of the angle adjustment roller 4 can be specifically engraved with two lines of thread in opposing directions, forming an arrow-shaped structure. This arrow-shaped structure is an arrow-shaped functional layer applied to the surface of the first portion. The pitch and number of threads (i.e., the extended arrow-shaped lines) can be tailored to the surface density of the film being produced. The depth of the arrow-shaped lines can be designed to be 0.1-0.6 mm, and the single-line extension width is preferably maintained at 5-12 mm. The roller surface corresponding to the arrow-shaped lines can be made of ceramic, stainless steel, or surface hardened for high-density film rolls. The main frame structure of the angle adjustment roller 4 is made of aluminum alloy, which reduces kinetic energy consumption during operation and improves the smoothness of the friction-driven operation of the film surface 100. The smaller moment of inertia also ensures better detection results of the tension of the film surface 100 by the subsequent tension detection roller 5.
[0028] As an optional embodiment, the lithium-ion battery diaphragm tension compensation mechanism also includes a slider 10, a first slide rail 11, a slide rail stopper 12, and an adjustment roller bearing pedestal 13; the two ends of the angle adjustment roller 4 are respectively mounted on the corresponding adjustment roller bearing pedestals 13, the adjustment roller bearing pedestals 14 are fixedly connected to the slider 10, the slider 10 is slidably connected to the first slide rail 11, and the first slide rail 11 is vertically fixed to the mechanism vertical plate 1. The slide rail stopper 12 is located at the lower end of the first slide rail 11 and is used to limit the slider 10; the screw assembly 9 is connected to the adjustment roller bearing pedestal 13 and drives the slider 10 and the adjustment roller bearing pedestal 13 to perform synchronous lifting and lowering movements. Furthermore, the slide rail stopper 12 is provided with a groove, and the first slide rail 11 is mounted in the groove.
[0029] In the above embodiment, the first slide rail 11 is fixed to the side of the mechanism vertical plate 1 by bolts, and the slider 10 is fixed to the adjustment roller bearing seat 13; the adjustment roller bearing seat 13 is connected to the angle adjustment roller 4 through a bearing (not shown in the figure); the lower end of the first slide rail 11 is connected to the slide rail limit block 12, as shown in FIG. Figure 6 As shown, the slide rail limiting block 12 is provided with a groove for cooperating with the first slide rail 11 to achieve a locking function.
[0030] As an optional implementation, Figure 5 As shown, the screw assembly 9 includes a nut 901 and a screw rod 902. The nut 901 is sleeved on the screw rod 902 and is used to perform lifting and lowering movements driven by the screw rod 902. One end of the screw rod 901 is passed through the slide rail limit block 12, and the slide rail limit block 12 is provided with a fastener for locking the screw rod 902.
[0031] In the above embodiment, if Figure 7 As shown, the back of the adjusting roller bearing seat 13 is provided with two connecting bosses, which are used to install two corresponding nuts 901. Each nut 901 is inserted into the corresponding screw rod 902 and is threadedly connected. The three together constitute the transmission component. Among them, the lower ends of the two screw rods 902 are symmetrically inserted into the slide rail limit block 12, and a special end cap is provided at the upper end of the screw rod 902 to fix the screw rod 902. An anti-loosening device is provided at the bottom end of the screw rod 902. The screw rod 902 itself has a self-anti-loosening function and can cooperate with the anti-loosening device to form two anti-loosening measures to ensure the stability of the membrane surface during equipment production to the greatest extent. The specific form of the anti-loosening device is to set fasteners (which can be butterfly bolts) on both sides of the bottom end of the slide rail limit block 13 to further lock the screw rod 902. When adjusting the wrap angle adjusting roller 4, the butterfly bolt can lock the screw rod 902 in the process of adjusting the membrane wrap angle by raising and lowering the slider 10, which plays a better control adjustment and fixing effect. The lower end of the screw rod 902 is set to be flat, and can be rotated by a tool to complete the lifting and lowering of the slider 10, thereby driving the adjusting roller bearing seat 13 and the angle adjustment roller 4 to rise and fall synchronously to complete the adjustment of the film wrap angle.
[0032] As an optional implementation, Figure 4 As shown, the lithium-ion battery diaphragm tension compensation mechanism also includes a tension sensor 14, a tension sensor bracket 15 and a tension roller bearing seat 16; the tension sensor 14 is installed on the tension sensor bracket 15, the tension sensor bracket 15 is fixedly connected to the mechanism vertical plate 1, and the tension detection roller 5 is installed on the tension sensor 14 through the tension roller bearing seat 16. The tension sensor 14 is in contact with the tension detection roller 5 and is used to obtain tension data and transmit the tension data to the tension adjustment roller electric cylinder 8.
[0033] Specifically, the tension detection system is composed of a tension sensor 14, a tension sensor bracket 15, a tension roller bearing seat 16, and a tension detection roller 5. The tension detection system is mainly aimed at the direction of the film, that is, the real-time tension value and the tension fluctuation range corresponding to the previous process; its working principle is that the tension sensor (specifically, a shaft table tension sensor) 14 detects the real-time tension value of the film surface 100 on the tension detection roller 5, and is linked with the electronic control part, and then converted into an electrical signal to control the extension and contraction of the piston rod of the tension adjustment electric cylinder (specifically, a BC direct-connected horizontal type) 8, thereby adjusting the tension in real time. The position of the whole roller 7 is used to dynamically correct and regulate the film surface tension of the previous process, further reducing the extreme fluctuation range of the film surface tension to achieve the purpose of adjustment and compensation, and at the same time it can also reduce the jitter problem of the film surface in the previous process; traditional production line equipment is often equipped with defect detectors and surface density meters to monitor and track product quality before winding. When the film surface reaches a stable operating state after passing through the tension detection system and the tension adjustment and compensation system, the stability and accuracy of the measurement work of the defect detector and surface density meter can be guaranteed, avoiding the occurrence of measurement data distortion problems, and improving the effectiveness and efficiency of product quality judgment.
[0034] As an optional implementation, Figure 2 As shown, the lithium-ion battery diaphragm tension compensation mechanism also includes a roller connecting fixed ring 17, a bearing pedestal 18, a tension adjustment roller bearing 19 and a second slide rail 20. The two ends of the tension adjustment roller 7 are respectively installed on one end of the corresponding bearing pedestal 18 through bearings, and the other end of the bearing pedestal 18 is rollingly installed in the second slide rail 20 through the tension adjustment roller bearing 19. The piston rod of the tension adjustment roller electric cylinder 8 is connected to the bearing pedestal 18 through the roller connecting fixed ring 17 and is used to drive the bearing pedestal 18 to move along the second slide rail 20. The second slide rail 20 is fixed to the mechanism vertical plate 1.
[0035] In the above embodiment, taking the three tension adjustment rollers 7 as an example, the corresponding three tension adjustment roller electric cylinders 8 include one BC direct-connected horizontal electric cylinder and two RC parallel horizontal electric cylinders. The three tension adjustment roller electric cylinders 8 are all fixed on the mechanism vertical plate 1. Among them, the center line of the BC direct-connected horizontal electric cylinder is parallel to the ground. In order to make it cooperate with the tension adjustment roller 7, the end of the electric cylinder piston rod can adopt a fisheye joint. The electric cylinder piston rod and the bearing seat 18 are matched through the roller connection fixing ring 17. The roller connection fixing ring 17 is matched with the bearing seat 18 in the form of a through hole and a flat key. There are threaded holes on the left and right sides of the roller connection fixing ring 17 and the left and right sides of the bearing seat 18. The axial and radial positioning between the two is ensured by the flat key and threaded connection. The end of the bearing seat 18 is provided with a cylindrical opening for placing the bearing and the tension adjustment roller 7. The other end of the bearing seat 18 is connected to the tension adjustment roller The bearing 19 is mated, and the mated shaft end is embedded in the second slide rail 20. The second slide rail 20 adopts a two-wing structure and is fixed to the mechanism vertical plate 1 using through holes and bolts. The main body of the second slide rail 20 is a C-shaped structure with inward-facing vertical plates on both sides and polyurethane panels on three internal surfaces to prevent metal dust generated by the rolling and sliding of the tension adjustment roller bearing 19, which could affect the film surface quality. The reciprocating motion of the piston rod of the tension adjustment electric cylinder 8 drives the tension adjustment roller 7 to cooperate with the two fixed rollers 6 at the front and rear to adjust the position of the film surface 100. The fixed rollers 6, the first tension adjustment roller 7, and the BC direct-coupled horizontal cylinder together form the first tension adjustment and compensation system. In addition, two RC parallel horizontal cylinders, each at a 90° angle to the mounting reference plane, move vertically. Their control and operating principles are the same as those of the BC direct-coupled horizontal cylinder. Together with the fixed roller 6 and the second tension adjustment roller 7, they form the second tension adjustment and compensation system. After passing through the second tension adjustment roller 7, the film surface 100 will reach the next fixed roller 6. The fixed roller 6 here mainly plays the role of conduction and support. After passing through the fixed roller 6, the film surface in production enters the third tension adjustment and compensation system. Its components, operating principles, and mechanical coordination are the same as those of the second tension adjustment and compensation system. After cooperating with each other, they can form two-way tension adjustment compensation in the vertical direction of the mechanism, thereby maximizing the controllability and stability of the tension.
[0036] Furthermore, if Figure 9 As shown, threaded holes are provided at both ends of the bearing pedestal 18. One end of the bearing pedestal 18 is provided with a mounting opening 1801 for placing the tension adjustment roller 7. The other end of the bearing pedestal 18 has a connecting shaft 1802. The tension adjustment roller bearing 19 is sleeved on the connecting shaft 1802 and moves synchronously.
[0037] As an optional implementation, Figure 1As shown, the lithium-ion battery diaphragm tension compensation mechanism also includes a fixed roller bearing pedestal 21. The two ends of the fixed roller 6 are respectively installed on the corresponding fixed roller bearing pedestals 21 through bearings, and the fixed roller bearing pedestals 21 are fixed to the mechanism vertical plate 1.
[0038] After the membrane surface 100 contacts the wrap angle adjustment roller 4, it can be raised and lowered for adjustment. The adjustment principle is that the stroke of the lead screw assembly 9 and the first slide rail 11 jointly determine the adjustable length. By adjusting the position of the wrap angle adjustment roller 4, the height position of the membrane surface 100 is controlled, thereby changing the wrap angle between the membrane surface 100 and the wrap angle adjustment roller 4. This can solve problems such as insufficient tension and relaxation of the membrane surface, too little friction between the membrane surface 100 and the wrap angle adjustment roller 4 due to too small an wrap angle, and roller loss and stall. To a certain extent, it can also achieve the effect of tension regulation. For the two wrap angle adjustment rollers 4 used in this embodiment, the same principle is adopted to ensure that the membrane surface 100 can adjust the wrap angle when entering and leaving the tension compensation mechanism, avoid the phenomenon of membrane surface instability when the mechanism is connected between the front and rear sections, eliminate the problem of roller stall, and minimize tension fluctuations and membrane surface operation instability.
[0039] The design, consideration, equipment operation and control measures of the tension system of the coating and winding mechanism in the lithium-ion diaphragm industry are determined according to the following formula (1): M=M F +M f +M j (1) Where, M is the motor torque, M F is the material tension torque, M f is the friction compensation torque, M j is the acceleration and deceleration inertia momentum torque.
[0040] Among them, the motor torque M is mostly controlled by the servo motor, which belongs to the automatic torque adjustment system configured in the production line equipment. It is mostly manifested in the gradual reduction of the motor torque as the film core diameter changes when the winding mechanism is constantly winding at a constant tension. The acceleration and deceleration inertia momentum torque is difficult to control, and because the proportion of time it occupies is very small, when the corresponding inertia momentum is generated as the production line accelerates and decelerates, the product often cannot be tested and evaluated as a stable finished product, so it is not considered as an important basis. In order to further adapt the stability of the motor torque M and improve the stability of the film surface operation, the direct and effective solution is to target the material tension torque M F Friction compensation torque M fCarry out high-efficiency regulation and optimization control. The tension adjustment and compensation body in this application is composed of two tension adjustment rollers arranged at the lower end of the mechanism, and its running direction is the same as the vertical direction of the mechanism; its operating principle is to use the real-time tension value of the winding mechanism tension system as the signal input end, and after receiving the winding mechanism tension value feedback, it is processed by the electronic control system and converted into an electrical signal to control the tension adjustment roller electric cylinder, thereby controlling the electric cylinder action; the two tension adjustment rollers can ensure that the tension fluctuation is effectively regulated when the tension fluctuation is large, and the tension can be corrected in time according to the setting or real-time feedback; for related regulation aspects, the adjustable range and amplitude of the tension adjustment roller electric cylinder are larger than those of the tension adjustment roller electric cylinder. Under the conditions of meeting the tension stability of the winding mechanism and achieving adjustment compensation, the tension fluctuation range of the film surface near the winding end is kept as small as possible, the film surface operation is more stable, and the tension range is further reduced, thereby improving the quality of the product after winding.
[0041] In summary, the overall structure of the tension compensation mechanism of the present invention is simple and reasonable, and the detection components, feedback components, and execution components all have high efficiency properties; the entire device focuses on the use of electrical control methods, with a high degree of automation and high control accuracy. It is not prone to the error problems of traditional cylinder control and has low noise. The structural connection and coordination of each part are reasonable, there is no problem of frequent metal foreign matter, it is clean and pollution-free, and can be used in a dust-free environment; the tension adjustment and compensation method is stable, and there is a double-layer protection device to ensure the regulation and compensation of tension to the greatest extent; the tension correction compensation has a large range, short time, high efficiency and sensitivity, and there are multiple tension change settings, which can effectively improve the fault tolerance of the mechanism itself through mutual connection and coordination; it can solve the film surface jitter and the resulting inability to measure and distortion of measurement data by defect detectors and surface density meters; the film roll tension extreme value range is controlled within a small range to the maximum extent and operates stably; it solves the problem that the wrap angle between the roller and the film surface in traditional production lines is difficult or even impossible to adjust, and at the same time solves the roller stall problem caused by tension, friction, jitter and other reasons; the adaptability of the mechanism is strong, because the structure assembled with various rollers is simple and effective, different types of rollers can be replaced in actual production to improve the overall performance of the mechanism. This mechanism can stretch and flatten the membrane surface when it enters and leaves, which can further ensure the quality of the membrane surface and reduce the occurrence of problems such as wrinkles, collapsed edges, and scratches.
[0042] It should be noted that the various embodiments in this specification are described in a progressive manner. References to the same or similar parts between the various embodiments are sufficient. Each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and technologies are omitted here.
[0043] The above are merely embodiments of the present application and are not intended to limit the present application. Various modifications and variations are possible for those skilled in the art without departing from the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.
Claims
1. A lithium-ion battery diaphragm tension compensation mechanism, characterized in that: It includes a mechanism upright plate (1), a mechanism bottom plate (2), a supporting beam (3), an angle adjustment roller (4), a tension detection roller (5), a fixed roller (6), a tension adjustment roller (7), a tension adjustment roller electric cylinder (8) and a screw assembly (9); The two mechanism uprights (1) are respectively installed on opposite sides of the mechanism bottom plate (2), and the two mechanism uprights (1) are connected by a plurality of supporting beams (3). The two ends of the plurality of angle adjustment rollers (4) are respectively slidably connected to the two mechanism uprights (1) and are used to perform lifting and lowering movements under the drive of the screw assembly (9). The two ends of the plurality of fixed rollers (6) are respectively connected to the two mechanism uprights (1) and are used to transfer the membrane surface (100). The two ends of the plurality of tension adjustment rollers (7) are respectively slidably connected to the two mechanism uprights (1) and are used to perform lifting and lowering movements under the drive of the tension adjustment roller electric cylinder (8) to adjust the tension of the membrane surface (100). The tension detection roller (5) is installed on the mechanism upright (1) and is used to detect the tension of the membrane surface (100).
2. The lithium-ion battery diaphragm tension compensation mechanism according to claim 1, characterized in that: It also includes a slider (10), a first slide rail (11), a slide rail limit block (12), and an adjusting roller bearing seat (13); the two ends of the angle adjusting roller (4) are respectively installed on the corresponding adjusting roller bearing seat (13), the adjusting roller bearing seat (13) is fixedly connected to the slider (10), the slider (10) is slidably connected to the first slide rail (11), the first slide rail (11) is fixed to the mechanism vertical plate (1) in the vertical direction, the slide rail limit block (12) is located at the lower end of the first slide rail (12) and is used to limit the slider (10); the screw assembly (9) is connected to the adjusting roller bearing seat (13) and drives the slider (10) and the adjusting roller bearing seat (13) to perform synchronous lifting and lowering movements.
3. The lithium-ion battery diaphragm tension compensation mechanism according to claim 2, characterized in that: The slide rail limiting block (12) is provided with a groove, and the first slide rail (11) is installed in the groove.
4. The lithium-ion battery diaphragm tension compensation mechanism according to claim 2, characterized in that: The screw assembly (9) includes a nut (901) and a screw rod (902), wherein the nut (901) is sleeved on the screw rod (902) and is used for performing lifting motion under the drive of the screw rod (902), and one end of the screw rod (901) is passed through the slide rail limit block (12), and the slide rail limit block (12) is provided with a fastener for locking the screw rod (902).
5. The lithium-ion battery diaphragm tension compensation mechanism according to claim 2, characterized in that: It also includes a tension sensor (14), a tension sensor bracket (15) and a tension roller bearing seat (16); the tension sensor (14) is installed on the tension sensor bracket (15), the tension sensor bracket (15) is fixedly connected to the mechanism vertical plate (1), the tension detection roller (5) is installed on the tension sensor (14) through the tension roller bearing seat (16), the tension sensor (14) is in contact with the tension detection roller (5) and is used to obtain tension data and transmit the tension data to the tension adjustment roller electric cylinder (8).
6. The lithium-ion battery diaphragm tension compensation mechanism according to claim 1, characterized in that: It also includes a roller connecting fixed ring (17), a bearing pedestal (18), a tension adjustment roller bearing (19) and a second slide rail (20), wherein the two ends of the tension adjustment roller (7) are respectively mounted on one end of the corresponding bearing pedestal (18) through bearings, and the other end of the bearing pedestal (18) is rollingly mounted in the second slide rail (20) through the tension adjustment roller bearing (19), and the piston rod of the tension adjustment roller electric cylinder (8) is connected to the bearing pedestal (18) through the roller connecting fixed ring (17) and is used to drive the bearing pedestal (18) to move along the second slide rail (20), and the second slide rail (20) is fixed to the mechanism vertical plate (1).
7. The lithium-ion battery diaphragm tension compensation mechanism according to claim 6, characterized in that: Both ends of the bearing pedestal (18) are provided with threaded holes, one end of the bearing pedestal (18) is provided with a mounting opening (1801) for placing the tension adjustment roller (7), and the other end of the bearing pedestal (18) has a connecting shaft (1802), and the tension adjustment roller bearing (19) is sleeved on the connecting shaft (1802) and moves synchronously.
8. The lithium-ion battery diaphragm tension compensation mechanism according to claim 1, characterized in that: It also includes a fixed roller bearing pedestal (21), and both ends of the fixed roller (6) are respectively mounted on the corresponding fixed roller bearing pedestals (21) through bearings, and the fixed roller bearing pedestals (21) are fixed to the mechanism vertical plate (1).
9. The lithium-ion battery diaphragm tension compensation mechanism according to claim 1, characterized in that: The angle adjustment roller (4) comprises a first part, a second part and a third part which are connected to each other, wherein the second part and the third part are respectively located at two ends of the first part, the second part and the third part are both mesh structures, and the surface of the third part is provided with a plurality of engraved lines in opposite directions of the thread lines.
10. The lithium-ion battery diaphragm tension compensation mechanism according to claim 9, characterized in that: The mesh structure is made of rubber or silicone.