Diaphragm micro-tension control device of winding machine

Abstract

The utility model relates to a micro tension control device for a diaphragm of a winding machine, which comprises a driving mechanism, a first tension adjusting mechanism, a tension detection mechanism, a second tension adjusting mechanism and a plurality of roller passing structures which are mounted in the winding machine. The multiple roller passing structures are installed between the unwinding roller and the winding needle, the first tension adjusting mechanism, the driving mechanism, the tension detecting mechanism and the second tension adjusting mechanism are sequentially inserted among the multiple roller passing structures, and a diaphragm is unwound by the unwinding roller and sequentially passes through the first tension adjusting mechanism, the driving mechanism, the tension detecting mechanism and the second tension adjusting mechanism. And winding at a winding needle. According to the diaphragm micro-tension control device for the winding machine, high-precision control can be performed on diaphragm micro-tension through three schemes at the same time, constant diaphragm tension is guaranteed, and the problems of loosening, dislocation, excessive stretching and the like of the diaphragm in the conveying process are solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and in particular to a micro-tension control device for a winding machine diaphragm. Background Technology

[0002] With the continuous iteration of lithium-ion battery technology, customers' demands for micro-tension of separators are constantly increasing. Especially with the gradual promotion of silicon anode technology in consumer applications, it is necessary to reduce separator tension to ensure that silicon anode cells maintain high performance after cycle charging and discharging. Micro-tension winding of separators is imperative. However, existing tension control mechanisms cannot meet the requirements of micro-tension control, frequently resulting in problems such as separator loosening, misalignment, and overstretching. Furthermore, the large fluctuations in separator tension during micro-tension control make it impossible to achieve precise control or taper tension control, thus failing to meet the needs of cell products. Utility Model Content

[0003] The main objective of this invention is to provide a micro-tension control device for a winding machine diaphragm to solve the above-mentioned technical problems and to automatically adjust the micro-tension of the diaphragm.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A diaphragm micro-tension control device for a winding machine is installed in the winding machine and includes a drive mechanism, a first tension adjustment mechanism, a tension detection mechanism, a second tension adjustment mechanism, and multiple roller structures. The drive mechanism, the first tension adjustment mechanism, the tension detection mechanism, the second tension adjustment mechanism, and multiple roller structures are installed in the winding machine, with the multiple roller structures installed between the unwinding roller and the winding needle. The first tension adjustment mechanism, the drive mechanism, the tension detection mechanism, and the second tension adjustment mechanism are sequentially inserted between the multiple roller structures. After the unwinding roller unwinds the diaphragm, it passes through the first tension adjustment mechanism, the drive mechanism, the tension detection mechanism, and the second tension adjustment mechanism in sequence, and then reaches the winding needle for winding.

[0006] As a preferred technical solution, the tension detection mechanism includes a tension sensor and a detection roller, the detection roller being connected to the tension sensor, and the diaphragm being driven along the detection roller.

[0007] As a preferred technical solution, the second tension adjustment mechanism includes a voice coil motor, a second adjusting roller, a roller seat, a cross roller bearing, an adjustment mounting base, and an adjustment guide rail. The voice coil motor and the adjustment guide rail are mounted on the adjustment mounting base. The second adjusting roller is rotatably mounted on the roller seat, and the roller seat moves along the adjustment guide rail via the cross roller bearing.

[0008] As a preferred technical solution, the first tension adjustment mechanism includes an adjustment motor, a first adjustment roller, and a swing arm. The first adjustment roller is installed at both ends of the swing arm, and the adjustment motor drives the swing arm to rotate.

[0009] As a preferred technical solution, the driving mechanism includes a driving bracket, a pressure roller structure, and a driving structure. The pressure roller structure and the driving structure are mounted on the driving bracket, the pressure roller structure abuts against the driving structure, and a diaphragm drives the transmission between the pressure roller structure and the driving structure.

[0010] As a preferred technical solution, the pressure roller structure includes a pressure roller cylinder, a pressure roller seat, and a pressure roller. The pressure roller is mounted on the pressure roller seat, and the pressure roller cylinder is mounted on the drive bracket. The pressure roller cylinder drives the pressure roller seat to move.

[0011] As a preferred technical solution, the driving structure includes a driving roller and a driving motor, the driving motor drives the driving roller to rotate, and the driving roller abuts against the pressure roller.

[0012] As a preferred technical solution, the roller structure includes a roller, a roller shaft, a bearing, and an end cap. The roller is mounted on the roller shaft via the bearing, and the end cap is mounted on the end of the roller.

[0013] The beneficial effects of this utility model are as follows: The above-mentioned winding machine diaphragm micro-tension control device can simultaneously control the diaphragm micro-tension with high precision through three schemes, ensuring constant diaphragm tension and avoiding problems such as slackness, misalignment, and excessive stretching of the diaphragm during the conveying process. It can also switch control modes for different types of cells and diaphragm materials, greatly improving the compatibility of the equipment and the adaptability to new lithium battery processes. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the winding machine involved in this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the first tension adjustment mechanism involved in this utility model;

[0016] Figure 3 This is a schematic diagram of the drive mechanism involved in this utility model;

[0017] Figure 4 This is a schematic diagram of the tension detection mechanism involved in this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the second tension adjustment mechanism involved in this utility model;

[0019] Figure 6This is a schematic diagram of the roller structure involved in this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] like Figure 1 As shown, a diaphragm micro-tension control device for a winding machine is installed in the winding machine and is used to transport the first diaphragm and the second diaphragm to the winding needle. The winding needle winds the positive electrode sheet, the first diaphragm, the negative electrode sheet, and the second diaphragm to form a battery cell. The device includes a drive mechanism 2, a first tension adjustment mechanism 1, a tension detection mechanism 3, a second tension adjustment mechanism 4, and multiple roller passing structures 5. The drive mechanism 2, the first tension adjustment mechanism 1, the tension detection mechanism 3, the second tension adjustment mechanism 4, and multiple roller passing structures 5 are installed in the winding machine. The multiple roller passing structures 5 are installed between the unwinding roller a and the winding needle. Between b, the diaphragm is conveyed to the winding needle b. The first tension adjustment mechanism 1, the drive mechanism 2, the tension detection mechanism 3, and the second tension adjustment mechanism 4 are sequentially inserted between multiple roller structures 5. The unwinding roller a unwinds the diaphragm sequentially through the first tension adjustment mechanism 1, the drive mechanism 2, the tension detection mechanism 3, and the second tension adjustment mechanism 4, and then winds it at the winding needle b. The drive mechanism 2 is used for conveying the diaphragm, the tension detection mechanism 3 is used to detect the tension change of the diaphragm, and the first tension adjustment mechanism 1 and the second tension adjustment mechanism 4 are used to adjust the tension of the diaphragm.

[0022] like Figure 2 As shown, the first tension adjustment mechanism 1 includes an adjustment motor 11, a coupling 15, a rotating shaft 12, a first adjustment roller 14, and a swing arm 13. The first adjustment roller 14 is a lightweight roller to reduce the resistance encountered by the diaphragm during transmission. The adjustment motor 11 is connected to the rotating shaft 12 through the coupling 15. The swing arm 13 is fixed to the end of the rotating shaft 12. The first adjustment roller 14 is installed at both ends of the swing arm 13. The adjustment motor 11 drives the rotating shaft 12 to rotate, thereby driving the swing arm 13 to rotate, thereby adjusting the tension of the diaphragm to maintain the tension stability during the transmission process of the diaphragm.

[0023] like Figure 3As shown, the drive mechanism 2 includes a drive bracket 21, a pressure roller structure 23, and a drive structure 22. The pressure roller structure 23 and the drive structure 22 are mounted on the drive bracket 21. The pressure roller structure 23 abuts against the drive structure 22. The diaphragm is driven between the pressure roller structure 23 and the drive structure 22. The pressure roller structure 23 presses the diaphragm against the surface of the drive structure 22, so that when the drive structure 22 is driven, it can drive the diaphragm to move. The pressure roller structure 23 includes a pressure roller cylinder 231, a pressure roller seat 232, and a pressure roller 233. The pressure roller 233 is mounted on the pressure roller seat 232, and the pressure roller cylinder 231 is mounted on the drive bracket 21. The pressure roller cylinder 231 drives the pressure roller seat 232 to move, thereby driving the pressure roller 233 to move towards the drive roller 222, so that the diaphragm can be subjected to constant pressure. The drive structure 22 includes a drive roller 222 and a drive motor 221. The drive motor 221 drives the drive roller 222 to rotate, and the drive roller 222 abuts against the pressure roller 233 to ensure that the diaphragm is tightly attached to the surface of the drive roller 222. The linear speed at which the drive motor 221 drives the drive roller 222 to rotate is synchronized with the linear speed at which the winding needle b winds the surface of the battery cell, and together they drive the diaphragm transmission, thereby reducing the overall tension value of the diaphragm.

[0024] like Figure 4 As shown, the tension detection mechanism 3 includes a tension sensor 31 and a detection roller 32. The detection roller 32 is connected to the tension sensor 31, and the diaphragm is driven along the detection roller 32. The detection roller 32 is a lightweight roller to reduce the resistance encountered by the diaphragm during transmission. By connecting strain gauges to a Wheatstone bridge, minute tension changes of the diaphragm are measured. The sampling frequency can reach 2ms. The use of a lightweight roller reduces the influence of roller resistance on the measurement results, enabling real-time and accurate detection of the diaphragm tension magnitude and fluctuation value.

[0025] like Figure 5 As shown, the second tension adjustment mechanism 4 includes a voice coil motor 42, a second adjusting roller 46, a roller seat 41, a crossed roller bearing 44, an adjustment mounting base 45, and an adjustment guide rail 43. The voice coil motor 42 and the adjustment guide rail 43 are mounted on the adjustment mounting base 41. The second adjusting roller 46 is rotatably mounted on the roller seat 45, and the roller seat 45 moves along the adjustment guide rail 43 via the crossed roller bearing 44. The second adjusting roller 46 is a lightweight roller, reducing the resistance encountered during diaphragm transmission. The high responsiveness and accurate torque control of the voice coil motor 42 quickly adjust diaphragm tension fluctuations. The crossed roller bearing reduces the resistance during the movement of the adjustment mounting base 45, and the lightweight roller reduces the inertia during the movement of the second adjusting roller 46, improving the responsiveness of the tension control system and maintaining tension fluctuations within the target range.

[0026] like Figure 6As shown, the roller structure 5 includes a roller 52, a roller shaft 51, a bearing (not shown in the figure), and an end cap 53. The roller 52 is mounted on the roller shaft 51 via the bearing, and the end cap 53 is mounted on the end of the roller 51. The roller shaft 51 is made of high-strength aluminum alloy, which reduces the overall mass while meeting strength requirements. The roller 52 is made of carbon fiber, resulting in a smaller overall moment of inertia, thus reducing tension fluctuations caused by the moment of inertia of the roller 52. The bearing is a ceramic bearing, which reduces the resistance when the roller 52 rotates and ensures the stability of tension transmission. The end cap 53 has a dustproof design to prevent tension fluctuations caused by dust entering the bearing and causing it to rotate unevenly.

[0027] The above-mentioned winding machine diaphragm micro-tension control device has the following three tension adjustment methods:

[0028] I. Closed-Loop Control Mode: After the diaphragm is unwound, the drive mechanism 2 and the winding needle b synchronously drive the diaphragm transmission. The tension sensor 31 detects the tension fluctuation of the diaphragm. At this time, the voice coil motor 42 calculates the output thrust based on the comparison between the value detected by the tension sensor and the target value, realizing closed-loop control of the winding diaphragm tension. The tension sensor 31 has a sampling frequency of 2ms, using 2-5 sampling samples as one cycle to calculate the average tension cycle and fluctuation trend. The tension change value is estimated through an algorithm, and the tension is quickly adjusted by the voice coil motor in a closed loop.

[0029] II. Speed ​​Control Mode: Before winding, the winding speed is self-learned using a single roll of diaphragm to simulate the speed fluctuation curve during winding. After the diaphragm is unwound, the first tension adjustment mechanism 1 controls the unwinding tension of the diaphragm, and the drive mechanism 2 drives the diaphragm through a preset winding speed. The voice coil motor 42 self-learns the speed fluctuation curve and adjusts the position of the tension roller during winding to match the speed, avoiding tension fluctuations caused by speed differences. The tension sensor 31 monitors the tension fluctuation value and feeds it back to the voice coil motor 42 for compensation control in the next cycle, realizing micro-tension control of the wound diaphragm.

[0030] III. Force Control Mode: Before winding, the tension sensor 31 identifies tension fluctuation points and calculates the tension fluctuation curve by using a single roll of diaphragm. After the diaphragm is unwound, the first tension adjustment mechanism 1 controls the unwinding tension. The linear speed of the drive roller 222 driven by the drive motor 221 is synchronized with the linear speed of the winding needle b winding the surface of the battery cell. The voice coil motor 42 learns the tension fluctuation curve and adjusts the output thrust during the winding process to eliminate diaphragm tension fluctuations and maintain the diaphragm tension within a small range of the target value. The tension sensor 31 monitors the tension fluctuation value and feeds it back to the voice coil motor 42 for compensation control in the next cycle, thus realizing micro-tension control of the wound diaphragm.

[0031] The embodiments described above are merely preferred examples of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this utility model should be included within the scope of this utility model patent application.

Claims

1. A diaphragm micro-tension control device for a winding machine, installed in the winding machine, characterized in that, The device includes a drive mechanism, a first tension adjustment mechanism, a tension detection mechanism, a second tension adjustment mechanism, and multiple roller passing structures. The drive mechanism, the first tension adjustment mechanism, the tension detection mechanism, the second tension adjustment mechanism, and multiple roller passing structures are installed in a winding machine. The multiple roller passing structures are installed between the unwinding roller and the winding needle. The first tension adjustment mechanism, the drive mechanism, the tension detection mechanism, and the second tension adjustment mechanism are sequentially inserted between the multiple roller passing structures. After the unwinding diaphragm passes through the first tension adjustment mechanism, the drive mechanism, the tension detection mechanism, and the second tension adjustment mechanism in sequence, it reaches the winding needle for winding.

2. The micro-tension control device for the diaphragm of the winding machine according to claim 1, characterized in that, The tension detection mechanism includes a tension sensor and a detection roller, the detection roller being connected to the tension sensor, and the diaphragm being driven along the detection roller.

3. The micro-tension control device for the diaphragm of the winding machine according to claim 1, characterized in that, The second tension adjustment mechanism includes a voice coil motor, a second adjusting roller, a roller seat, a cross roller bearing, an adjustment mounting base, and an adjustment guide rail. The voice coil motor and the adjustment guide rail are mounted on the adjustment mounting base. The second adjusting roller is rotatably mounted on the roller seat, and the roller seat moves along the adjustment guide rail via the cross roller bearing.

4. The micro-tension control device for the diaphragm of the winding machine according to claim 1, characterized in that, The first tension adjustment mechanism includes an adjustment motor, a first adjustment roller, and a swing arm. The first adjustment roller is installed at both ends of the swing arm, and the adjustment motor drives the swing arm to rotate.

5. The micro-tension control device for the diaphragm of the winding machine according to claim 1, characterized in that, The driving mechanism includes a driving bracket, a pressure roller structure, and a driving structure. The pressure roller structure and the driving structure are mounted on the driving bracket. The pressure roller structure abuts against the driving structure, and a diaphragm drives the transmission between the pressure roller structure and the driving structure.

6. The micro-tension control device for the diaphragm of the winding machine according to claim 5, characterized in that, The pressure roller structure includes a pressure roller cylinder, a pressure roller seat, and a pressure roller. The pressure roller is mounted on the pressure roller seat, and the pressure roller cylinder is mounted on the drive bracket. The pressure roller cylinder drives the pressure roller seat to move.

7. The micro-tension control device for the diaphragm of a winding machine according to claim 6, characterized in that, The driving structure includes a driving roller and a driving motor. The driving motor drives the driving roller to rotate, and the driving roller abuts against the pressure roller.

8. The micro-tension control device for the diaphragm of the winding machine according to claim 1, characterized in that, The roller structure includes a roller, a roller shaft, a bearing, and an end cap. The roller is mounted on the roller shaft via the bearing, and the end cap is mounted on the end of the roller.

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