Tension-controlled winding mechanism
By designing a tension-controlled winding mechanism, using tension sensors, adjustment devices and feeding drive devices, winding difficulties and core quality problems caused by increasing tension of the material belt are solved, and more efficient winding and better cores are achieved.
Patent Information
- Application Number
- CN202323464472.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-19
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2033-12-19
AI Technical Summary
During the battery production process, the tension of the material belt increases after being conveyed by multiple rollers, resulting in difficulty in winding the needle, forming wrinkles of the material belt inside the core, affecting the core quality and winding efficiency.
A tension-controlled winding mechanism is designed, including a needle rolling, an unwinding device, a tension adjustment device, a tension sensor and a feed drive device. The tension of the tape is detected by the tension sensor, the tension adjustment device (such as the swing rod mechanism) is adjusted, and the feeding drive device is combined with the deviation correction device and the encoder to accurately control the conveying speed and tension of the tape.
It effectively reduces the burden on the rolling needle, improves the winding efficiency and core quality, and avoids deformation of the material tape and wrinkles inside the core.
Smart Images
Figure CN222883568U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of lithium battery automation equipment, and in particular relates to a winding mechanism for controlling the tension of a winding core. Background Art
[0002] The battery production equipment winds the positive electrode sheet, the first separator, the negative electrode sheet, and the second separator in layers to form a winding core. In some production processes, the positive electrode sheet or the negative electrode sheet can be pre-heat-compounded with the first separator or the second separator to form an integrated structure. For ease of description, the positive electrode sheet, the negative electrode sheet, the first separator, the second separator, and their heat-compounded structure are collectively referred to as material strips in the utility model. Before the material strip enters the winding needle for winding, it passes through multiple rollers, causing the tension of the material strip to increase, which will cause difficulty in winding the winding needle or wrinkles in the material strip inside the winding core, affecting the quality of the winding core and the winding efficiency. Utility Model Content
[0003] The utility model aims to provide a tension-controlled winding mechanism which can improve winding efficiency and winding core quality.
[0004] To achieve the above purpose, the winding mechanism of the utility model with tension control comprises:
[0005] A winding needle, used for winding at least one material strip to form a winding core;
[0006] An unwinding device for providing the material strip to the winding needle;
[0007] A tension adjusting device is arranged between the winding needle and the unwinding device, and is used to control the tension of the material strip between the tension adjusting device and the winding needle;
[0008] The tension sensor is arranged between the tension adjustment device and the winding needle, and is used to detect the tension information of the material strip;
[0009] The feeding drive device is arranged between the unwinding device and the tension adjusting device, and is used to drive the material strip to be transmitted toward the winding needle.
[0010] In an embodiment of the tension-controlled winding mechanism of the utility model, the tension adjustment device is a swing rod mechanism, and the swing of the swing rod mechanism is controlled according to the tension information.
[0011] In one embodiment of the tension-controlled winding mechanism of the utility model, an encoder is provided between the unwinding device and the tension adjusting device and close to the tension adjusting device for detecting the speed of the material strip.
[0012] In one embodiment of the tension-controlled winding mechanism of the utility model, a deviation correction device is further provided between the winding needle and the unwinding device, and the deviation correction device uses a magnetic powder clutch to connect the deviation correction driving member and the deviation correction part.
[0013] In one embodiment of the tension-controlled winding mechanism of the utility model, the feeding drive device includes a first roller and at least one second roller, the first roller is driven to actively rotate, and the second roller is driven to move closer to or away from the first roller to jointly convey the material belt.
[0014] In one embodiment of the tension-controlled winding mechanism of the utility model, three second rollers are provided and distributed on the outer circumference of the first roller, so that the material strip and the first roller form a large wrap angle.
[0015] In one embodiment of the tension-controlled winding mechanism of the present invention, the second roller is configured to be movable in an axial direction.
[0016] In one embodiment of the tension-controlled winding mechanism of the utility model, the feeding drive device also includes a first mounting plate spaced apart from the first roller, the first mounting plate having a plurality of first mounting holes spaced apart along the width direction of the material strip, the second roller being arranged on a second mounting plate, and the second mounting plate being mounted on the first mounting plate through a plurality of first mounting holes.
[0017] In one embodiment of the tension-controlled winding mechanism of the present invention, the first mounting plate is provided with a slide groove extending along the width direction of the material strip, and the second mounting plate is provided with a slider matching the slide groove.
[0018] In one embodiment of the tension-controlled winding mechanism of the utility model, the second roller is mounted on a roller seat, and the roller seat is slidably connected to the second mounting plate via a pair of slide rails. A driving member is also provided on the second mounting plate, and a driving end of the driving member is connected to the roller seat.
[0019] In summary, the tension-controlled winding mechanism of the utility model controls the tension of the material strip through the feeding drive device and the tension adjustment device, thereby reducing the burden on the winding needle and improving the winding efficiency and the quality of the winding core. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural diagram of an embodiment of a winding mechanism for tension control of the utility model;
[0021] Figure 2 yes Figure 1 Structural diagram of the feeding drive device;
[0022] 100, material strip; 110, pole piece; 111, positive pole piece; 112, negative pole piece; 120, diaphragm; 121. first diaphragm; 122. second diaphragm; 200. winding needle; 300. winding core; 400. unwinding device; 410. first diaphragm unwinding device; 420. positive electrode sheet unwinding device; 430. second diaphragm unwinding device; 440. negative electrode sheet unwinding device; 500. feeding drive device; 510. bottom plate; 520. first roller; 530. motor seat; 540. direct drive motor; 550. second roller; 560. roller seat; 561. slide rail; 570. second mounting plate; 571. slider; 580. driving member; 590. first mounting plate; 591. first mounting hole; 592. slide groove; 600. tension adjusting device; 700. tension sensor; 800. deviation correction device; 900. encoder. DETAILED DESCRIPTION
[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0024] like Figure 1 The figure shows a structural diagram of an embodiment of a tension-controlled winding mechanism of the utility model. The tension-controlled winding mechanism transmits the material strip 100 to a winding needle 200, and the winding needle 200 winds the material strip 100 to form a winding core 300. The material strip 100 can be a pole piece 110 or a diaphragm 120. The pole piece 110 is divided into a positive pole piece 111 and a negative pole piece 112. The diaphragm 120 is divided into a first diaphragm 121 and a second diaphragm 122. Four unwinding devices 400 are provided correspondingly, namely a first diaphragm unwinding device 410, a positive pole piece unwinding device 420, a second diaphragm unwinding device 430, and a negative pole piece unwinding device 440, which respectively provide the first diaphragm 121, the positive pole piece 111, the second diaphragm 122, and the negative pole piece 112 to the winding needle 200. The winding needle 200 winds up the stacked first separator 121 , the positive electrode sheet 111 , the second separator 122 , and the negative electrode sheet 112 to form a winding core 300 .
[0025] A feeding drive device 500 is provided between the unwinding device 400 and the winding needle 200, and an encoder 900 for detecting the speed of the material strip 100 is provided between the feeding drive device 500 and the winding needle 200. The speed of the feeding drive device 500 is calculated based on the unwinding speed of the unwinding device 400, the speed of the material strip 100 detected by the encoder 900, and the winding speed of the winding needle 200.
[0026] The feeding drive device 500 drives the material belt at the above-calculated speed, and can provide a driving force F1 to the material belt 100, so that the tension F2 between the feeding drive device 500 and the winding needle 200 on the material belt 100 is much smaller than the tension F3 between the feeding drive device 500 and the unwinding device 400. In theory, the tension F2 is 0, and the driving force F1 provided by the feeding drive device 500 = F3. However, due to errors, friction and other conditions, in reality, the driving force F1 provided by the feeding drive device 500 cannot completely offset the tension F3, and can only make F2 as small as possible, reduce the burden on the winding needle 200, make the winding needle 200 easier to wind, avoid the material belt 100 from being pulled and deformed, and improve the winding efficiency of the tension-controlled winding mechanism and the winding quality of the winding core.
[0027] In order to minimize the tension F2, a tension adjusting device 600 and a tension sensor 700 are sequentially arranged on the transmission path of the material strip 100 from the feeding drive device 500 to the winding needle 200, and the encoder 900 is arranged between the feeding drive device 500 and the tension adjusting device 600, and is closer to the tension adjusting device 600. In this embodiment, a tension adjusting device 600 and a tension sensor 700 are sequentially arranged on the transmission path of the first diaphragm 121 and the second diaphragm 122 from the feeding drive device 500 to the winding needle 200, and a feeding drive device 500 is separately arranged on the transmission path of the positive electrode sheet 111 and the negative electrode sheet 112. In other embodiments, a tension adjusting device 600 and a tension sensor 700 may also be sequentially arranged on the transmission path of the positive electrode sheet 111 and the negative electrode sheet 112 from the feeding drive device 500 to the winding needle 200.
[0028] The tension adjusting device 600 is a swing rod mechanism, which is used to control the tension of the material strip 100 between the tension adjusting device 600 and the winding needle 200. The specific structure of the swing rod mechanism has been disclosed in the prior art and will not be described in detail. The tension sensor 700 is used to detect the tension information of the material strip 100. The tension adjusting device 600 controls the swing of the swing rod mechanism according to the tension information detected by the tension sensor 700.
[0029] The control principle of tension F2 is as follows: Preset the maximum limit value F2 of tension F2 max and the minimum limit value F2 min When the actual value of the tension F2 detected by the tension sensor 700 reaches the maximum limit value F2 max When the actual value of the tension F2 detected by the tension sensor 700 reaches the minimum limit value F2, the swing lever mechanism swings in the direction of reducing the tension F2; min When , the rocker mechanism swings in the direction of increasing the tension F2, so that F2 is always within the set range.
[0030] The feeding drive device 500 is arranged upstream of the tension adjusting device 600, which can effectively solve the problem that a larger torque compensation is needed to stabilize the material line in the whole winding process due to factors such as excessive roller resistance, acceleration and deceleration inertia torque and diaphragm air knife resistance during the unwinding device 400 and the material belt 100. The material line from the tension adjusting device 600 to the winding needle 200 is short and has few rollers. Excluding the influence of the above factors, auxiliary control of the tension F2 can be achieved, so that F2 reaches a micro tension, reducing the difficulty of controlling the tension F2.
[0031] A deviation correction device 800 is also provided between the winding needle 200 and the unwinding device 400. The deviation correction device 800 performs deviation correction processing on the material strip 100. The deviation correction device 800 uses a magnetic powder clutch to connect the deviation correction driving member and the deviation correction part, and can accurately control the torque.
[0032] like Figure 2 As shown, the feeding drive device 500 of this embodiment is installed on a bottom plate 510, and includes a first roller 520. The first roller 520 is installed on the bottom plate 510 through a motor seat 530, and a direct drive motor 540 is arranged inside the motor seat 530. One end of the first roller 520 extends into the motor seat 530 and is connected to the direct drive motor 540. The direct drive motor 540 is preferably a DD motor, which drives the first roller 520 to actively rotate and convey a material belt 100. The direct drive motor 540 directly drives the rotation of the first roller 520, and can timely control the start and stop of the first roller 520, and the first roller 520 responds faster.
[0033] In order to prevent the first roller 520 from slipping when conveying the material belt 100, at least one second roller 550 is provided on the outer circumferential surface of the first roller 520, and the second roller 550 cooperates with the first roller 520 to convey the material belt 100. In this embodiment, one second roller 550 is provided as an example, and in other embodiments, multiple second rollers 550 may be provided to increase the friction between the material belt 100 and the first roller 520. In order to prevent the material belt 100 and the first roller 520 from slipping, the first roller 520 is also made of a high friction material.
[0034] The second roller 550 is rotatably mounted on a roller seat 560, and the roller seat 560 is slidably mounted on a second mounting plate 570 through a pair of slide rails 561. A driving member 580 is provided on the second mounting plate 570. The driving member 580 is preferably a cylinder, and the driving end of the cylinder is connected to the roller seat 560, driving the second roller 550 to approach or move away from the first roller 520, and act on the material belt 100 together with the first roller 520 to clamp or release the material belt 100. The driving member 580 is set between the pair of slide rails 561, and the setting direction of the pair of slide rails 561 is parallel to the driving direction of the driving member 580, which guides the sliding of the roller seat 560 and improves the movement accuracy of the second roller 550.
[0035] The second mounting plate 570 is mounted on a first mounting plate 590 by screws. The first mounting plate 590 is also arranged on the bottom plate 510 and is spaced apart from the first roller 520. The first mounting plate 590 is provided with a plurality of first mounting holes 591 spaced apart along the width direction of the material strip 100. By mounting the second mounting plate 570 on different first mounting holes 591, the mounting position of the second roller 550 along the width direction of the material strip 100 can be changed to adapt to material strips 100 of different widths.
[0036] The first mounting plate 590 is also provided with a slide groove 592 extending along the width direction of the material belt, and the second mounting plate 570 is provided with a slider 571 cooperating with the slide groove 592. The slider 571 cooperates with the slide groove 592. When the installation position of the second mounting plate 570 on the first mounting plate 590 is changed, the slide groove 592 restricts the slider 571, thereby ensuring that the second roller 550 is always parallel to the first roller 520, and ensuring that when the second roller 550 and the first roller 520 act on the material belt 100 together, the force on the material belt 100 is uniform.
[0037] Reference again Figure 1 As shown, since the diaphragm 120 has greater ductility than the electrode sheet 110, in order to prevent the diaphragm 120 from deforming when the feeding drive device 500 drives the diaphragm 120, the feeding drive device 500 driving the first diaphragm 121 and the second diaphragm 122 is provided with three second rollers 550. The three second rollers 550 make the first diaphragm 121 and the second diaphragm 122 form a large wrap angle with the corresponding first roller 520, thereby increasing the friction between the first diaphragm 121, the second diaphragm 122 and the first roller 520. The feeding drive device 500 driving the positive electrode sheet 111 and the negative electrode sheet 112 can also be provided with a plurality of second rollers 550. In this embodiment, the feeding drive device 500 driving the positive electrode sheet 111 and the negative electrode sheet 112 is provided with only one second roller 550.
[0038] The above embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in this technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.
Claims
1. A tension-controlled winding mechanism, characterized in that: include: A winding needle, used for winding at least one material strip to form a winding core; An unwinding device for providing the material strip to the winding needle; A tension adjusting device is arranged between the winding needle and the unwinding device, and is used to control the tension of the material strip between the tension adjusting device and the winding needle; The tension sensor is arranged between the tension adjustment device and the winding needle, and is used to detect the tension information of the material strip; The feeding drive device is arranged between the unwinding device and the tension adjusting device, and is used to drive the material strip to be transmitted toward the winding needle.
2. The tension-controlled winding mechanism according to claim 1, characterized in that: The tension adjustment device is a swing rod mechanism, and the swing of the swing rod mechanism is controlled according to the tension information.
3. The tension-controlled winding mechanism according to claim 1, characterized in that: An encoder is arranged between the unwinding device and the tension adjusting device and close to the tension adjusting device for detecting the speed of the material belt.
4. The tension-controlled winding mechanism according to claim 1, characterized in that: A deviation correction device is also arranged between the winding needle and the unwinding device, and the deviation correction device adopts a magnetic powder clutch to connect the deviation correction driving member and the deviation correction part.
5. The tension-controlled winding mechanism according to claim 1, characterized in that: The feeding drive device includes a first roller and at least one second roller, the first roller is driven to actively rotate, and the second roller is driven to approach or move away from the first roller to jointly convey the material belt.
6. The tension-controlled winding mechanism according to claim 5, characterized in that: The number of the second rollers is three and they are distributed on the outer circumference of the first roller, so that the material strip and the first roller form a large wrap angle.
7. The tension-controlled winding mechanism according to claim 5, characterized in that: The second roller is configured to be movable in an axial direction.
8. The tension-controlled winding mechanism according to claim 7, characterized in that: The feeding drive device also includes a first mounting plate spaced apart from the first roller, the first mounting plate having a plurality of first mounting holes spaced apart along the width direction of the material strip, the second roller being arranged on a second mounting plate, and the second mounting plate being mounted on the first mounting plate through a plurality of first mounting holes.
9. The tension-controlled winding mechanism according to claim 8, characterized in that: The first mounting plate is provided with a slide groove extending along the width direction of the material strip, and the second mounting plate is provided with a sliding block matched with the slide groove.
10. The tension-controlled winding mechanism according to claim 8, characterized in that: The second roller is mounted on a roller seat, and the roller seat is slidably connected to the second mounting plate via a pair of slide rails. A driving member is also provided on the second mounting plate, and a driving end of the driving member is connected to the roller seat.