A low tension winding mechanism

Abstract

The utility model discloses a winding low-tension mechanism, which relates to the technical field of lithium battery diaphragm production equipment. The key points of the technical solution are: it includes an active roller 1 and a winding roller, the winding roller is located above the active roller 1, two passive rollers are arranged between the active roller 1 and the winding roller, a tension mechanism is arranged between the two passive rollers, and the rotation direction of the two passive rollers is opposite to the rotation direction of the active roller 1 and the winding roller. The utility model can minimize the number of guide rollers in the winding process when the lithium battery diaphragm is wound through the structural setting, and the tension control roller is positioned as close to the winding roller as possible to ensure that the diaphragm can be adjusted for the final tension before it is wound, thereby ensuring the winding quality of the lithium battery diaphragm.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragm production equipment, and more specifically, to a winding low-tension mechanism. Background Art

[0002] In the structure of lithium batteries, the diaphragm is one of the key internal components. The performance of the diaphragm determines the interface structure and internal resistance of the battery, and directly affects the battery's capacity, cycle and safety performance. A diaphragm with excellent performance plays an important role in improving the comprehensive performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through.

[0003] In the lithium battery industry, winding tension refers to the pulling force or pressure that the diaphragm bears during the winding process. The thickness of the current diaphragm substrate is getting thinner and thinner, and the tension is getting smaller and smaller. In order to ensure quality, low-tension winding is pursued to avoid damaging the characteristics of the diaphragm. However, the winding tension is closely related to the machine's operating status, winding speed, tension control and other related process parameters. If the diaphragm winding tension is too small, it will cause the diaphragm to be loosely wound, and it will also easily cause the diaphragm to relax and increase the internal resistance, affecting the power and capacity of the battery.

[0004] Therefore, it is necessary to provide a low-tension winding mechanism to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a low-tension winding mechanism to solve the problems raised in the above-mentioned background technology.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A low-tension winding mechanism comprises an active roller and a winding roller, wherein the winding roller is located above the active roller, two passive rollers are arranged between the active roller and the winding roller, a tension mechanism is arranged between the two passive rollers, and the rotation direction of the two passive rollers is opposite to that of the active roller and the winding roller.

[0008] The technical solution of the utility model is further configured as follows: the two passive rollers include a passive roller one and a passive roller two, the axial center height of the passive roller two is consistent with the axial center height of the winding roller, the height of the passive roller one is located between the passive roller two and the active roller one, and the passive roller two is located directly above the passive roller one.

[0009] The technical solution of the utility model is further configured as follows: an active roller 2 is provided between the active roller 1 and the passive roller 1 at a horizontal distance, the top of the active roller 2 is higher than the top of the active roller and lower than the top of the passive roller 1, and the rotation direction of the active roller 2 is the same as the rotation direction of the active roller 1 and the winding roller.

[0010] The technical solution of the utility model is further configured as follows: the tension mechanism includes a tension control roller, the height of the tension control roller is located between the passive roller one and the passive roller two, the passive roller one and the passive roller two are located between the horizontal distance between the tension control roller and the winding roller, and the rotation direction of the tension control roller is the same as the rotation direction of the active roller one and the winding roller.

[0011] The technical solution of the utility model is further configured as follows: the tension mechanism also includes a rotating shaft and a driving cylinder, both ends of the tension control roller are fixedly connected to the rotating shaft through connecting arms, the driving cylinder is connected to one end of the rotating shaft through a connecting plate, and the driving end of the driving cylinder is rotatably connected to the connecting plate.

[0012] The technical solution of the utility model is further configured as follows: a through groove for the rotating shaft to pass through is provided on the connecting plate, a connecting groove penetrating the connecting plate and communicating with the outside is provided on the inner wall of the through groove, and a bolt vertically penetrating the connecting groove is threadedly connected to the connecting plate.

[0013] The technical solution of the utility model is further configured as follows: one end of the rotating shaft away from the driving cylinder is fixedly connected with a clamp, the bottom end of the clamp is fixedly connected with a sector-shaped toothed plate, and a gear meshing with the sector-shaped toothed plate is provided below the sector-shaped toothed plate.

[0014] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0015] Through the structural setting, the number of guide rollers used in the winding process of the lithium battery diaphragm is relatively small, which makes it easier to adjust the tension of the diaphragm. In addition, because the tension mechanism is arranged on the side close to the winding roller, it can be fine-tuned according to actual conditions before the diaphragm is about to be wound up, so as to ensure the quality of the actual wound product. The tension control roller is arranged between the passive roller one and the passive roller two, so that the lithium battery diaphragm is pulled in an S shape at the tension control roller and the two passive rollers before being wrapped on the winding roller. This increases the contact area, making the traction smoother and more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2The structure diagram of the tension mechanism in the utility model is shown in FIG. Figure 1 ;

[0018] Figure 3 The structure diagram of the tension mechanism in the utility model is shown in FIG. Figure 2 .

[0019] In the figure: 1. Active roller 1; 2. Winding roller; 3. Passive roller 1; 4. Passive roller 2; 5. Active roller 2; 6. Tension control roller; 7. Rotating shaft; 8. Driving cylinder; 9. Connecting arm; 10. Connecting plate; 11. Through groove; 12. Connecting groove; 13. Bolt; 14. Hoop; 15. Sector tooth plate; 16. Gear. DETAILED DESCRIPTION

[0020] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model. Example

[0021] like Figures 1 to 3 As shown, the utility model provides a winding low-tension mechanism, including an active roller 1 and a winding roller 2, the winding roller 2 is located above the active roller 1, two passive rollers are arranged between the active roller 1 and the winding roller 2, a tension mechanism is arranged between the two passive rollers, and the rotation direction of the two passive rollers is opposite to the rotation direction of the active roller 1 and the winding roller 2.

[0022] like Figures 1 to 3 As shown, the two passive rollers include a passive roller 13 and a passive roller 24, the axial height of the passive roller 24 is consistent with the axial height of the winding roller 2, the height of the passive roller 3 is located between the passive roller 24 and the active roller 1, the passive roller 24 is located directly above the passive roller 3, an active roller 25 is provided between the horizontal distance between the active roller 1 and the passive roller 3, the top of the active roller 25 is higher than the top of the active roller and lower than the top of the passive roller 3, the tension mechanism includes a tension control roller 6, the height of the tension control roller 6 is located between the passive roller 13 and the passive roller 24, the passive roller 13 and the passive roller 24 are located between the horizontal distance between the tension control roller 6 and the winding roller 2, and the rotation direction of the active roller 25 and the tension control roller 6 is the same as the rotation direction of the active roller 1 and the winding roller 2.

[0023] Through the above-mentioned method, the lithium battery diaphragm is pulled in an S shape at the tension control roller 6 and the two passive rollers before being wrapped on the winding roller 2. This method increases the contact area, making the traction more stable and more accurate. In addition, the setting of the active roller 2 5 further increases the wrapping angle of the lithium battery diaphragm on the passive roller 1 3, ensuring the traction stability and the quality of the lithium battery diaphragm membrane surface. Because the tension control roller 6 is set on the side close to the winding roller, it can be fine-tuned according to the actual situation before the diaphragm is about to be wound up, so as to ensure the quality of the actual wound product, achieve stable low-tension winding, and ensure the tension stability as much as possible.

[0024] like Figures 1 to 3 As shown, the tension mechanism also includes a rotating shaft 7 and a driving cylinder 8. Both ends of the tension control roller 6 are fixedly connected to the rotating shaft 7 through a connecting arm 9. The driving cylinder 8 is connected to one end of the rotating shaft 7 through a connecting plate 10. The driving end of the driving cylinder 8 is rotatably connected to the connecting plate 10. A through groove 11 for the rotating shaft 7 to pass through is provided on the connecting plate 10. A connecting groove 12 that penetrates the connecting plate 10 and is connected to the outside is provided on the inner wall of the through groove 11. A bolt 13 that vertically penetrates the connecting groove 12 is threadedly connected to the connecting plate 10. One end of the rotating shaft 7 away from the driving cylinder 8 is fixedly connected to a clamp 14. The bottom end of the clamp 14 is fixedly connected to a fan-shaped tooth plate 15. A gear 16 that meshes with the fan-shaped tooth plate 15 is provided below the fan-shaped tooth plate 15.

[0025] Through the above-mentioned method, when it is necessary to adjust the tension of the lithium battery diaphragm, the driving cylinder 8 can be started to extend the driving end of the driving cylinder 8, thereby driving the connecting plate 10 to rotate. When the connecting plate 10 rotates, it will drive the rotating shaft 7 fixedly connected to it to rotate. The rotating rotating shaft 7 drives the tension control roller 6 to rotate with the rotating shaft 7 as the rotation center through the connecting arm 9, thereby adjusting the relative position of the tension control roller 6 and the rotating shaft 7. Because the diaphragm between the passive roller 1 3 and the passive roller 2 4 will pass through the surface of the tension control roller 6, when the position of the tension control roller 6 changes, its traction effect on the diaphragm will also change, thereby adjusting the surface tension of the diaphragm before the winding is completed, and the fan-shaped tooth plate 15 and the gear 16 on one end of the rotating shaft 7 have a deceleration effect, reducing the movement speed of the driving end of the driving cylinder 8, thereby ensuring that the thrust applied by the cylinder is relatively stable and the tension change is relatively smooth.

[0026] like Figures 1 to 3As shown, during the winding process of the lithium battery diaphragm, the diaphragm passes through the active roller 1 and the active roller 2 5 and then enters the passive roller 3, then passes through the tension control roller 6 and then enters the passive roller 2 4, and finally is wrapped on the surface of the winding roller 2. During the whole process, the diaphragm material route is short, the number of passive rollers is small and the inertia of the passive rollers is small, which can greatly reduce the stability of the winding roller 2 and realize low-tension winding. This method can provide sufficient tension before winding, and adjust the tension before winding onto the winding roller 2 to reduce the tension, taking into account the internal neatness and deformation of the diaphragm product, thereby achieving efficient and stable traction effect and ensuring the membrane surface quality of the lithium battery diaphragm.

[0027] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A winding low tension mechanism, comprising a driving roller (1) and a winding roller (2), characterized in that: The winding roller (2) is located above the active roller (1), two passive rollers are arranged between the active roller (1) and the winding roller (2), a tension mechanism is arranged between the two passive rollers, and the rotation direction of the two passive rollers is opposite to the rotation direction of the active roller (1) and the winding roller (2).

2. A winding low tension mechanism according to claim 1, characterized in that: The two passive rollers include a passive roller 1 (3) and a passive roller 2 (4); the axial height of the passive roller 2 (4) is consistent with the axial height of the winding roller (2); the height of the passive roller 1 (3) is located between the passive roller 2 (4) and the active roller 1 (1); and the passive roller 2 (4) is located directly above the passive roller 1 (3).

3. A winding low tension mechanism according to claim 2, characterized in that: An active roller 2 (5) is provided between the active roller 1 (1) and the passive roller 1 (3) in a horizontal distance, the top of the active roller 2 (5) being higher than the top of the active roller and lower than the top of the passive roller 1 (3), and the rotation direction of the active roller 2 (5) being the same as the rotation direction of the active roller 1 (1) and the winding roller (2).

4. A winding low tension mechanism according to claim 2 or 3, characterized in that: The tension mechanism comprises a tension control roller (6), the height of the tension control roller (6) is located between the passive roller 1 (3) and the passive roller 2 (4), the passive roller 1 (3) and the passive roller 2 (4) are located between the horizontal distance between the tension control roller (6) and the winding roller (2), and the rotation direction of the tension control roller (6) is the same as the rotation direction of the active roller 1 (1) and the winding roller (2).

5. A winding low tension mechanism according to claim 4, characterized in that: The tension mechanism further comprises a rotating shaft (7) and a driving cylinder (8); both ends of the tension control roller (6) are fixedly connected to the rotating shaft (7) via a connecting arm (9); the driving cylinder (8) is connected to one end of the rotating shaft (7) via a connecting plate (10); and the driving end of the driving cylinder (8) is rotatably connected to the connecting plate (10).

6. A winding low tension mechanism according to claim 5, characterized in that: The connecting plate (10) is provided with a through slot (11) for the rotating shaft (7) to pass through, the inner wall of the through slot (11) is provided with a connecting slot (12) penetrating the connecting plate (10) and communicating with the outside, and the connecting plate (10) is threadedly connected with a bolt (13) vertically penetrating the connecting slot (12).

7. A winding low tension mechanism according to claim 5, characterized in that: One end of the rotating shaft (7) away from the driving cylinder (8) is fixedly connected to a clamp (14), the bottom end of the clamp (14) is fixedly connected to a sector-shaped toothed plate (15), and a gear (16) meshing with the sector-shaped toothed plate (15) is provided below the sector-shaped toothed plate (15).

Images