A lithium ion battery separator tension compensation mechanism

Abstract

The utility model relates to the technical field of lithium ion battery diaphragm, concretely relates to a kind of lithium ion battery diaphragm tension compensation mechanism, mechanism vertical plate, mechanism bottom plate, support crossbeam, corner angle adjusting roller, tension detection roller, fixed over roller, tension adjusting roller, tension adjusting roller electric cylinder and screw rod assembly;Two mechanism vertical plates are respectively installed in the opposite sides of mechanism bottom plate, multiple corner angle adjusting rollers are slidably connected with two mechanism vertical plates and are used to be driven under the screw rod assembly to carry out lifting movement, two ends of multiple fixed over rollers are respectively connected with two mechanism vertical plates and are used to transfer film surface, multiple tension adjusting rollers are slidably connected with two mechanism vertical plates and are used to be driven under the tension adjusting roller electric cylinder to carry out lifting movement to adjust the tension of film surface, and tension detection roller is used to detect the tension of film surface.The purpose of the lithium ion battery diaphragm tension compensation mechanism is to solve the problem that the lithium ion battery diaphragm coating production process cannot be corrected in time when the film roll tension difference is large and the tension fluctuation is large.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery separator technology, and specifically to a lithium-ion battery separator tension compensation mechanism. Background Technology

[0002] Currently, tension control in lithium-ion battery coating production lines is basically segmented control. Conventional equipment can be divided into four to five independent tension control segments. Independent tension control means that the tension control is more sensitive. The independent tension segments are usually separated by equipment components such as adsorption rollers and glue rollers. Each independent tension control segment mainly relies on tension swing rollers to adjust the film tension. The common method is to adjust the tension by pushing or pulling the tension swing rollers with airbag cylinders.

[0003] The coating production line is a segmented system. The friction generated by the wrap angle between the film surface and the rollers, which have a large span, drives the rollers. The magnitude of this friction and the smoothness of the roller rotation also affect the fluctuation of the independent tension in each segment of the production line. At the end of the production line, the winding equipment typically uses constant tension or constant torque control to wind up the coated film rolls. The determination of the film surface quality grade relies on defect detectors and areal density meters for measurement and assessment. The stability of the tension at the front end of the winding equipment is crucial for quality grade determination and also affects the quality of the coated and slit products.

[0004] Unstable film tension can lead to internal compression or loosening of the wound film material, poor finished product quality, wrinkling, uneven end faces, inconsistent tightness, and misalignment, resulting in a decrease in the yield of coated products. Excessive tension variation can also affect the production of the next slitting process, leading to a lower final product approval rate. Furthermore, when tension fluctuations are large and cannot be corrected, the film surface will experience severe shaking, causing defect detectors and areal density meters to malfunction or produce distorted data, thus affecting product quality assessment.

[0005] Therefore, the inventors have provided a lithium-ion battery separator tension compensation mechanism. Utility Model Content

[0006] (1) Technical problems to be solved This utility model provides a lithium-ion battery separator tension compensation mechanism, which solves the technical problem that the lithium-ion battery separator coating production process cannot be corrected in time when the tension difference of the membrane roll is large and the tension fluctuation is large.

[0007] (2) Technical solution This utility model provides a lithium-ion battery separator tension compensation mechanism, including a mechanism upright plate, a mechanism base plate, a support beam, a wrap angle adjusting roller, a tension detection roller, a fixed guide roller, a tension adjustment roller, a tension adjustment roller electric cylinder, and a lead screw assembly. Two mechanism upright plates are respectively installed on opposite sides of the mechanism base plate, and the two mechanism upright plates are connected by multiple support beams. The ends of multiple wrap angle adjusting rollers are slidably connected to the two mechanism upright plates and are used for lifting and lowering under the drive of the lead screw assembly. The ends of multiple fixed guide rollers are respectively connected to the two mechanism upright plates and are used for transmitting membrane tension. The ends of multiple tension adjustment rollers are slidably connected to the two mechanism upright plates and are used for lifting and lowering under the drive of the tension adjustment roller electric cylinder to adjust the tension of the membrane surface. The tension detection roller is installed on the mechanism upright plate and is used to detect the tension of the membrane surface.

[0008] Furthermore, the lithium-ion battery separator tension compensation mechanism also includes a slider, a first slide rail, a slide rail limiting block, and an adjusting roller bearing base; both ends of the wrap angle adjusting roller are respectively installed on the corresponding adjusting roller bearing bases, the adjusting roller bearing bases are fixedly connected to the slider, the slider is slidably connected to the first slide rail, the first slide rail is fixed vertically to the mechanism upright plate, the slide rail limiting block is located at the lower end of the first slide rail and is used to limit the slider; the lead screw assembly is connected to the adjusting roller bearing base and drives the slider and the adjusting roller bearing base to perform synchronous lifting and lowering movements.

[0009] Furthermore, the slide rail limiting block has a groove, and the first slide rail is installed in the groove.

[0010] Furthermore, the lead screw assembly includes a nut and a lead screw. The nut is sleeved on the lead screw and is used to perform lifting and lowering movements under the drive of the lead screw. One end of the lead screw passes through the slide rail limiting block, and the slide rail limiting block is provided with fasteners for locking the lead screw.

[0011] Furthermore, the lithium-ion battery separator tension compensation mechanism also includes a tension sensor, a tension sensor bracket, and a tension roller bearing seat; the tension sensor is mounted on the tension sensor bracket, the tension sensor bracket is fixedly connected to the mechanism upright plate, the tension detection roller is mounted 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 acquire tension data and transmit the tension data to the tension adjustment roller electric cylinder.

[0012] Furthermore, the lithium-ion battery separator tension compensation mechanism also includes a roller connecting and fixing ring, a bearing base, a tension adjusting roller bearing, and a second slide rail. The two ends of the tension adjusting roller are respectively mounted on one end of the corresponding bearing base via bearings, and the other end of the bearing base is rolled in the second slide rail via the tension adjusting roller bearing. The piston rod of the tension adjusting roller electric cylinder is connected to the bearing base via the roller connecting and fixing ring and is used to drive the bearing base to move along the second slide rail. The second slide rail is fixed to the mechanism upright plate.

[0013] Furthermore, threaded holes are provided at both ends of the bearing base, one end of the bearing base is provided with an installation port for placing the tension adjusting roller, and the other end of the bearing base is provided with a connecting shaft, and the tension adjusting roller bearing is sleeved on the connecting shaft and moves synchronously.

[0014] Furthermore, the lithium-ion battery separator tension compensation mechanism also includes a fixed roller bearing base, with both ends of the fixed roller respectively mounted on the corresponding fixed roller bearing base via bearings, and the fixed roller bearing base fixed to the mechanism upright plate.

[0015] Furthermore, the wrap angle adjusting 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 located at both ends of the first part. Both the second part and the third part are mesh structures. The surface of the third part is provided with multiple engraved lines with the thread direction facing each other.

[0016] Furthermore, the mesh structure is made of rubber or silicone.

[0017] (3) Beneficial effects In summary, this invention compensates for the tension of the film surface by using a tension adjusting roller, solving the problem of the inability to promptly correct large tension differences and fluctuations in the film roll during the lithium-ion membrane coating process. It also addresses the difficulty in adjusting tension imbalances at tension boundary sections to the greatest extent possible. Simultaneously, the use of a wrap angle adjusting roller to adjust the wrap angle between the roller and the film surface solves problems such as roller stalling caused by unstable tension or substrate film roll edge collapse. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is a structural axis view of a lithium-ion battery separator tension compensation mechanism provided in an embodiment of this utility model; Figure 2 yes Figure 1 Enlarged schematic diagram of the structure at point A in the diagram; Figure 3 This is a top view of the structure of a lithium-ion battery separator tension compensation mechanism provided in this embodiment of the utility model; Figure 4 This is a schematic diagram of the working state of a lithium-ion battery separator tension compensation mechanism provided in this embodiment of the utility model; Figure 5 yes Figure 4 Enlarged schematic diagram of the structure at point B in the diagram; Figure 6 This is a schematic diagram of the slide rail limiting block in a lithium-ion battery diaphragm tension compensation mechanism provided in this embodiment of the utility model; Figure 7 This is a schematic diagram of the structure of the adjusting roller bearing base in a lithium-ion battery diaphragm tension compensation mechanism provided in this embodiment of the utility model; Figure 8 This is a schematic diagram of the roller connection and fixing ring in a lithium-ion battery diaphragm tension compensation mechanism provided in this embodiment of the utility model; Figure 9 This is a schematic diagram of the bearing base in a lithium-ion battery diaphragm tension compensation mechanism provided in this embodiment of the utility model.

[0020] In the picture: 1-Mechanism upright plate; 2-Mechanism base plate; 3-Support beam; 4-Wrap angle adjusting roller; 5-Tension detection roller; 6-Fixed roller; 7-Tension adjusting roller; 8-Tension adjusting roller electric cylinder; 9-Screw assembly; 901-Nut; 902-Screw; 11-First slide rail; 12-Slide rail limit block; 13-Adjusting roller bearing base; 14-Tension sensor; 15-Tension sensor bracket; 16-Tension roller bearing seat; 17-Roller connecting fixing ring; 18-Bearing base; 1801-Mounting port; 1802-Connecting shaft; 19-Tension adjusting roller bearing; 20-Second slide rail; 21-Fixed roller bearing base; 100-Film surface. Detailed Implementation

[0021] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to exemplarily illustrate the principle of this utility model, but should not be used to limit the scope of this utility model. That is, this utility model is not limited to the described embodiments, and covers any modifications, substitutions and improvements to the parts, components and connection methods without departing from the spirit of this utility model.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Figure 1 This is a schematic diagram of a lithium-ion battery separator tension compensation mechanism provided in an embodiment of this utility model. See also... Figure 1 The compensation mechanism may include a mechanism upright plate 1, a mechanism base plate 2, a support beam 3, a wrap angle adjusting roller 4, a tension detection roller 5, a fixed guide roller 6, a tension adjustment roller 7, a tension adjustment roller electric cylinder 8, and a lead screw assembly 9. Two mechanism upright plates 1 are respectively installed on opposite sides of the mechanism base plate 2, and the two mechanism upright plates 1 are connected by multiple support beams 3. The two ends of multiple wrap angle adjusting rollers 4 are slidably connected to the two mechanism upright plates 1 and are used for lifting and lowering under the drive of the lead screw assembly 9. The two ends of multiple fixed guide rollers 6 are respectively connected to the two mechanism upright plates 1 and are used to transmit the film surface 100. The two ends of multiple tension adjustment rollers 7 are slidably connected to the two mechanism upright plates 1 and are used for lifting and lowering 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 installed 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 1-5As shown, there are two mechanism uprights 1 and two mechanism base plates 2, and four supporting beams 3. The two mechanism uprights 1 are respectively installed on the corresponding mechanism base plates 2 to form the main body of the entire mechanism. The two mechanism uprights 1 are connected by evenly distributed supporting beams 3. Each supporting beam 3 has four through holes and is bolted to the two mechanism uprights 1 to complete the construction of the main body of the mechanism. Each of the two mechanism base plates 2 has six anchor bolt holes, and the mechanism base plates 2 can be installed in place using expansion bolts or chemical anchors. There are also two wrap angle adjusting rollers 4, which are located diagonally on the surface of the mechanism uprights 1 and are staggered vertically. The two wrap angle adjusting rollers 4 are the first and last rollers that the film surface 100 contacts when it enters the tension compensation mechanism, thereby completing the winding of the film surface 100. There are three tension adjusting rollers 7 and seven fixed guide rollers 6. The seven fixed guide rollers 6 work together to transmit the film surface 100 and also play a certain role in stabilizing the operation of the film surface 100 and stabilizing the tension. It should be noted that the specific quantities of the mechanism upright plate 1, mechanism base plate 2, support beam 3, wrap angle adjusting roller 4, tension detection roller 5, fixed guide roller 6, tension adjusting roller 7, tension adjusting roller electric cylinder 8, and lead screw assembly 9 are not limited and can be adjusted according to the actual situation.

[0027] Specifically, the wrap angle adjusting roller 4 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 located at both ends of the first part. The first part, the second part, and the third part are an integral structure. The surfaces of the first part, the second part, and the third part are all provided with corresponding functional layers. The surfaces of the second part and the third part are both mesh structures (with grooves set along the axial and radial directions of the roller body). The surface of the first part is provided with multiple grooves with the thread direction facing each other. The two ends of the wrap angle adjusting roller 4 (i.e., the second and third parts) adopt a mesh structure. This is mainly to address the problems of loose and collapsed edges at both ends of the normal width film surface during production and the problem of film surface shaking and looseness when producing a wide film surface. It uses the method of extending the film edge to adjust the film surface, so as to avoid problems such as unstable overall film surface tension, wrinkles in the middle, and film surface offset caused by loose film surface at both ends. 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 film surface during actual use, and ensure service life and low maintenance costs while providing sufficient friction. The middle part (i.e., the first part) of the wrap angle adjusting roller 4 can be formed by two opposing spiral lines, creating an arrow shape. This arrow-shaped structure is a functional layer applied to the surface of the first part. The pitch and number of spiral lines (i.e., the extended arrow-shaped lines) can be designed to fit the surface density of the produced film. The depth of the arrow-shaped lines can be designed to be 0.1–0.6 mm, and the single-line extension width should ideally be 5–12 mm. The roller surface material corresponding to the arrow-shaped line area can be ceramic, stainless steel, or, depending on the high surface density of the film roll, surface hardening. The main frame structure of the wrap angle adjusting roller 4 is made of aluminum alloy, which reduces energy consumption during operation, improves the smoothness of friction in driving the film surface 100, and the smaller moment of inertia ensures better tension detection results for the subsequent tension detection roller 5 on the film surface 100.

[0028] As an optional implementation, the lithium-ion battery separator tension compensation mechanism further includes a slider, a first slide rail 11, a slide rail limiting block 12, and an adjusting roller bearing base 13. The two ends of the wrap angle adjusting roller 4 are respectively installed on the corresponding adjusting roller bearing base 13. The adjusting roller bearing base 14 is fixedly connected to the slider, and the slider is slidably connected to the first slide rail 11. The first slide rail 11 is fixed vertically to the mechanism upright plate 1. The slide rail limiting block 12 is located at the lower end of the first slide rail 11 and is used to limit the slider. The lead screw assembly 9 is connected to the adjusting roller bearing base 13 and drives the slider and the adjusting roller bearing base 13 to perform synchronous lifting and lowering movements. Furthermore, the slide rail limiting block 12 has a groove, and the first slide rail 11 is installed in the groove.

[0029] In the above embodiment, the first slide rail 11 is fixed to the side of the mechanism upright plate 1 with bolts, and the slider is fixed to the adjusting roller bearing base 13; the adjusting roller bearing base 13 and the wrap angle adjusting roller 4 are connected by bearings (not shown in the figure); the lower end of the first slide rail 11 is connected to the slide rail limiting block 12, such as... Figure 6 As shown, the slide rail limiting block 12 has a groove for cooperating with the first slide rail 11 to achieve a locking function.

[0030] As an optional implementation method, such as Figure 5 As shown, the lead screw assembly 9 includes a nut 901 and a lead screw 902. The nut 901 is sleeved on the lead screw 902 and is used to perform lifting and lowering movements under the drive of the lead screw 902. One end of the lead screw 902 passes through the slide rail limit block 12, and the slide rail limit block 12 is provided with fasteners for locking the lead screw 902.

[0031] In the above embodiments, such as Figure 7 As shown, the back of the adjusting roller bearing base 13 has two connecting bosses for installing corresponding nuts 901. Each nut 901 passes through a corresponding lead screw 902 and is threadedly connected. The three together form a transmission component. The lower ends of the two lead screws 902 are symmetrically inserted into the slide rail limiting block 12, and a special end cap is provided at the upper end of the lead screw 902 to fix it. An anti-loosening device is provided at the lowest end of the lead screw 902. The lead screw 902 itself has a self-locking function and can cooperate with the anti-loosening device to form two layers of anti-loosening, maximizing the stability of the film surface during equipment production. The anti-loosening device is specifically designed by fasteners (such as butterfly bolts) on both sides of the bottom end of the slide rail limiting block 13 to further lock the lead screw 902. When adjusting the wrap angle adjusting roller 4, the butterfly bolts can lock the lead screw 902 during the process of adjusting the film wrap angle by raising and lowering the slider, achieving better control, adjustment, and fixing effects. The bottom end of the lead screw 902 is set to a flat shape, which can be rotated with a tool to complete the lifting and lowering of the slider, thereby driving the adjusting roller bearing base 13 and the wrap angle adjusting roller 4 to lift and lower synchronously, thus completing the adjustment of the film wrap angle.

[0032] As an optional implementation method, such as Figure 4 As shown, the lithium-ion battery separator 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 upright 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 contacts the tension detection roller 5 and is used to acquire tension data and transmit the tension data to the tension adjustment roller cylinder 8.

[0033] Specifically, the tension detection system comprises a tension sensor 14, a tension sensor bracket 15, a tension roller bearing seat 16, and a tension detection roller 5. This tension detection system primarily targets the real-time tension value and tension fluctuation range in the film-to-film direction, corresponding to the previous process. Its working principle involves the tension sensor (specifically, a shaft-mounted tension sensor) 14 detecting the real-time tension value on the film surface 100 of the tension detection roller 5. This value is then linked with the electrical control system, converting it into an electrical signal to control the extension and retraction of the piston rod of the tension adjustment cylinder (specifically, a BC direct-drive horizontal type) 8, thereby adjusting the tension in real time. The position of the roller 7 allows for dynamic correction and control of the film tension in the previous process, further reducing the range of fluctuations in film tension and achieving the purpose of adjustment and compensation. It can also reduce the vibration problem of the film surface in the previous process. Traditional production line equipment is often equipped with defect detectors and areal 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 tension adjustment and compensation system, the stability and accuracy of the measurement work of the defect detector and areal 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 method, such as Figure 2 As shown, the lithium-ion battery separator tension compensation mechanism also includes a roller connecting and fixing ring 17, a bearing base 18, a tension adjusting roller bearing 19, and a second slide rail 20. The two ends of the tension adjusting roller 7 are respectively mounted on one end of the corresponding bearing base 18 through bearings. The other end of the bearing base 18 is rolled in the second slide rail 20 through the tension adjusting roller bearing 19. The piston rod of the tension adjusting roller electric cylinder 8 is connected to the bearing base 18 through the roller connecting and fixing ring 17 and is used to drive the bearing base 18 to move along the second slide rail 20. The second slide rail 20 is fixed to the mechanism upright plate 1.

[0035] In the above embodiment, taking three tension adjusting rollers 7 as an example, the three tension adjusting roller electric cylinders 8 include one BC direct-coupled horizontal electric cylinder and two RC parallel-coupled horizontal electric cylinders. All three tension adjusting roller electric cylinders 8 are fixed on the mechanism upright plate 1. Among them, the center line of the BC direct-coupled horizontal electric cylinder is parallel to the ground. In order to cooperate with the tension adjusting roller 7, the end of the electric cylinder piston rod can adopt a fish-eye joint. The electric cylinder piston rod and the bearing base 18 are connected by the roller connecting and fixing ring 17. The roller connecting and fixing ring 17 is connected to the bearing base 18 by through hole and flat key. Threaded holes are opened on both sides of the roller connecting and fixing ring 17 and on both sides of the bearing base 18. The axial and radial positioning and fixing between the two are ensured by flat key and threaded connection. The bearing base 18 has a cylindrical opening at one end for placing the bearing and the tension adjusting roller 7. The other end of the bearing base 18 is connected to the tension adjusting roller. The bearing 19 is fitted, and the fitted shaft end is built into the second slide rail 20. The second slide rail 20 adopts a two-wing structure and is fixed to the mechanism upright plate 1 by through holes and bolts. The body of the second slide rail 20 has a C-shaped structure with internally fastened upright plates on both sides. Polyurethane plates are installed on three internal surfaces to prevent metal dust from being generated when the tension adjusting roller bearing 19 rolls and slides, thus affecting the film surface quality. The reciprocating motion of the piston rod of the tension adjusting electric cylinder 8 drives the tension adjusting roller 7 to cooperate with the fixed guide rollers 6 at the front and rear to adjust the position of the film surface 100. The fixed guide roller 6, the first tension adjusting roller 7, and the BC direct-drive horizontal electric cylinder together constitute the first tension adjustment compensation system. In addition, the two RC parallel horizontal electric cylinders are both at 90° to the installation reference plane and move vertically. Their control and operation principles are the same as those of the BC direct-drive horizontal electric cylinder, and together with the fixed guide roller 6 and the second tension adjusting roller 7, they constitute the second tension adjustment compensation system. After passing through the second tension adjusting 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 during production, the film surface enters the third tension adjustment and compensation system. Its components, operating principle and mechanical coordination are the same as the second tension adjustment and compensation system. After cooperating with each other, they can form bidirectional tension adjustment and compensation in the vertical direction of the mechanism, so as to maximize the controllability and stability of tension.

[0036] Furthermore, such as Figure 9 As shown, threaded holes are provided at both ends of the bearing base 18. One end of the bearing base 18 is provided with an installation port 1801 for placing the tension adjusting roller 7. The other end of the bearing base 18 has a connecting shaft 1802. The tension adjusting roller bearing 19 is sleeved on the connecting shaft 1802 and moves synchronously.

[0037] As an optional implementation method, such as Figure 1As shown, the lithium-ion battery separator tension compensation mechanism also includes a fixed roller bearing base 21. The two ends of the fixed roller 6 are respectively mounted on the corresponding fixed roller bearing base 21 through bearings. The fixed roller bearing base 21 is fixed to the mechanism upright plate 1.

[0038] After the film surface 100 contacts the wrap angle adjusting 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 adjusting roller 4, the height position of the film surface 100 is controlled, thereby changing the wrap angle between the film surface 100 and the wrap angle adjusting roller 4. This can solve problems such as insufficient film tension, insufficient friction between the film surface 100 and the wrap angle adjusting roller 4 due to an excessively small wrap angle, and roller slippage and stalling. To a certain extent, it can also achieve the function of tension control. For the two wrap angle adjusting rollers 4 used in this embodiment, the same principle is adopted to ensure that the wrap angle of the film surface 100 can be adjusted when entering and leaving this tension compensation mechanism, avoiding film surface instability when the mechanism is connected between the front and rear processes, eliminating roller stalling problems, and minimizing tension fluctuations and film surface instability.

[0039] The design, considerations, equipment operation, and control measures of the tension system of the coating and winding mechanism in the lithium-ion separator industry are determined according to the following formula (1): M=M F +M f +M j (1) In the formula, M is the motor torque, M F M represents the material tension torque. f To compensate for torque due to friction, M j These are acceleration / deceleration inertia, momentum, and torque.

[0040] The motor torque M is mostly controlled by a servo motor and belongs to the automatic torque adjustment system configured in the production line equipment. Its manifestation is that during constant tension winding in the winding mechanism, the motor torque gradually decreases as the diameter of the film roll core changes. However, acceleration / deceleration inertia / momentum torque is difficult to control, and because it occupies a very small proportion of the time, the resulting product often cannot be considered a stable finished product for testing and evaluation when the inertia / momentum is generated during acceleration / deceleration of the production line. Therefore, it is not considered an important criterion. To further adapt the stability of the motor torque M and improve the stability of the film surface operation, a direct and effective solution is to target the material tension torque M. F Friction-compensating torque M fThis application employs a highly efficient and optimized control method. The tension adjustment compensation system consists of two tension adjustment rollers located at the lower end of the mechanism, with their running direction aligned with the vertical direction of the mechanism. Its operating principle involves using the real-time tension value of the winding mechanism's tension system as a signal input. Upon receiving feedback from the winding mechanism's tension value, the signal is processed by the electronic control system and converted into an electrical signal to control the tension adjustment roller cylinders, thereby controlling the cylinders' movement. The two tension adjustment rollers effectively regulate tension fluctuations when they are significant and can promptly correct tension based on settings or real-time feedback. Regarding related control, the adjustable range and amplitude of the tension adjustment roller cylinders are larger than those of the tension adjustment roller cylinders. While ensuring tension stability and achieving adjustment compensation in the winding mechanism, this minimizes tension fluctuations near the winding end, resulting in more stable film operation and further reducing the tension range, thereby improving the quality of the wound product.

[0041] In summary, the overall structure of the tension compensation mechanism of this utility model is simple and reasonable, and the detection component, feedback component and execution component all have high efficiency. The whole device mainly uses electrical control, which has a high degree of automation, high control accuracy, and is not prone to the error problems of traditional cylinder control, and has low noise. The various structural components are rationally connected and coordinated, eliminating the frequent occurrence of metal foreign objects, ensuring cleanliness and pollution-free operation in dust-free environments. The tension adjustment and compensation method is stable and features a double-layer protection device, maximizing the control and compensation of tension. The tension correction and compensation has a wide range, short time, high efficiency, and sensitivity, with multiple tension-changing settings that, through mutual coordination, effectively improve the mechanism's fault tolerance. It solves the problems of film surface vibration and the resulting inability of defect detectors and areal density meters to measure or the distortion of measurement data. It maximizes the control of the film roll tension difference within a small range and ensures stable operation. It solves the problem of difficulty or even inability to adjust the wrap angle between the roller and the film surface in traditional production lines, while also addressing roller stalling caused by tension, friction, and vibration. The mechanism is highly adaptable; its simple and effective assembly structure with various rollers allows for the replacement of different types of rollers in actual production to improve the overall performance of the mechanism. This device can extend and flatten the membrane surface during both entry and exit, which can further ensure the quality of the membrane surface and reduce the occurrence of problems such as wrinkles, collapse, and scratches.

[0042] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. This utility model 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 techniques are omitted here.

[0043] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A lithium-ion battery separator tension compensation mechanism, characterized in that, It includes a mechanism upright plate (1), a mechanism base plate (2), a support beam (3), a wrap angle adjusting roller (4), a tension detection roller (5), a fixed guide roller (6), a tension adjusting roller (7), a tension adjusting roller electric cylinder (8), and a lead screw assembly (9); Two mechanism uprights (1) are respectively installed on opposite sides of the mechanism base plate (2), and the two mechanism uprights (1) are connected by multiple support beams (3). The two ends of multiple wrap angle adjusting 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 lead screw assembly (9). The two ends of multiple fixed rollers (6) are respectively connected to the two mechanism uprights (1) and are used to transmit the film surface (100). The two ends of multiple tension adjusting 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 adjusting roller electric cylinder (8) to adjust the tension of the film surface (100). The tension detection roller (5) is installed on the mechanism uprights (1) and is used to detect the tension of the film surface (100).

2. The lithium-ion battery separator tension compensation mechanism according to claim 1, characterized in that, It also includes a slider, a first slide rail (11), a slide rail limiting block (12), and an adjusting roller bearing base (13); the two ends of the wrap angle adjusting roller (4) are respectively installed on the corresponding adjusting roller bearing base (13), the adjusting roller bearing base (13) is fixedly connected to the slider, the slider is slidably connected to the first slide rail (11), the first slide rail (11) is fixed to the mechanism upright plate (1) in the vertical direction, the slide rail limiting block (12) is located at the lower end of the first slide rail (11) and is used to limit the slider; the lead screw assembly (9) is connected to the adjusting roller bearing base (13) and drives the slider and the adjusting roller bearing base (13) to perform synchronous lifting and lowering movements.

3. The lithium-ion battery separator tension compensation mechanism according to claim 2, characterized in that, The slide rail limiting block (12) has a groove, and the first slide rail (11) is installed in the groove.

4. The lithium-ion battery separator tension compensation mechanism according to claim 2, characterized in that, The lead screw assembly (9) includes a nut (901) and a lead screw (902). The nut (901) is sleeved on the lead screw (902) and is used to move up and down under the drive of the lead screw (902). One end of the lead screw (902) passes through the slide rail limiting block (12). The slide rail limiting block (12) is provided with fasteners for locking the lead screw (902).

5. The lithium-ion battery separator 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 mounted on the tension sensor bracket (15), the tension sensor bracket (15) is fixedly connected to the mechanism upright plate (1), the tension detection roller (5) is mounted 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 acquire tension data and transmit the tension data to the tension adjustment roller electric cylinder (8).

6. The lithium-ion battery separator tension compensation mechanism according to claim 1, characterized in that, It also includes a roller connecting fixing ring (17), a bearing base (18), a tension adjusting roller bearing (19), and a second slide rail (20). The two ends of the tension adjusting roller (7) are respectively mounted on one end of the corresponding bearing base (18) through bearings. The other end of the bearing base (18) is rolled in the second slide rail (20) through the tension adjusting roller bearing (19). The piston rod of the tension adjusting roller electric cylinder (8) is connected to the bearing base (18) through the roller connecting fixing ring (17) and is used to drive the bearing base (18) to move along the second slide rail (20). The second slide rail (20) is fixed to the mechanism upright plate (1).

7. The lithium-ion battery separator tension compensation mechanism according to claim 6, characterized in that, Both ends of the bearing base (18) are provided with threaded holes. One end of the bearing base (18) is provided with an installation port (1801) for placing the tension adjusting roller (7). The other end of the bearing base (18) has a connecting shaft (1802). The tension adjusting roller bearing (19) is sleeved on the connecting shaft (1802) and moves synchronously.

8. The lithium-ion battery separator tension compensation mechanism according to claim 1, characterized in that, It also includes a fixed roller bearing base (21), with the two ends of the fixed roller (6) respectively mounted on the corresponding fixed roller bearing base (21) via bearings, and the fixed roller bearing base (21) is fixed to the mechanism upright plate (1).

9. The lithium-ion battery separator tension compensation mechanism according to claim 1, characterized in that, The wrap angle adjusting roller (4) 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 located at the two ends of the first part, respectively. The second part and the third part are both mesh structures. The surface of the third part is provided with multiple engraved lines with the direction of the thread lines facing each other.

10. The lithium-ion battery separator tension compensation mechanism according to claim 9, characterized in that, The mesh structure is made of rubber or silicone.

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