Pole lug pre-extension device

Abstract

The tab pre-extension device comprises a passing roller, a rubber roller, a traction roller, a first swing roller, a first tension roller, a pre-extension roller system assembly, a pre-extension assembly, a second swing roller and a second tension roller, a gap is formed between the traction roller and the rubber roller; the pre-extending assembly comprises a support cross beam, pre-extending roller assemblies arranged transversely, pre-extending rubber roller assemblies, a pre-extending distance adjusting assembly used for adjusting the distance between the pre-extending roller assemblies and a pre-extending guide assembly, the pre-extending roller assemblies are arranged on the support cross beam through the pre-extending distance adjusting assembly, the pre-extending rubber roller assemblies are arranged on the support cross beam, and the pre-extending guide assembly is arranged on the support cross beam. The pre-extending guide assembly is located on one side of the pre-extending roller assembly. Therefore, the utility model has the advantages that the pole piece and the pole lug are not easy to break during pre-extension or shutdown, the tension partition can be increased, and the pre-extension effect can be improved.

Description

Technical Field

[0001] The utility model relates to the field of battery production, in particular to a tab pre-extension device. Background Art

[0002] The rolling process can improve the energy density of lithium-ion batteries and is an indispensable step in the manufacturing process of lithium-ion battery pole pieces. At present, after the lithium-ion battery pole pieces are rolled by the existing lithium-ion battery roller press, the extension difference between the dressing area and the pole ear of the lithium-ion battery pole piece is caused, which makes the pole ear area of ​​the lithium-ion battery pole piece easy to form wrinkles, and some tiny defects such as pinholes, notches and burrs on the pole piece and the pole ear will also be magnified due to the extension difference between the dressing area and the pole ear, thereby causing wrinkles in the dressing area and the pole ear after rolling, skirt defects due to the extension difference between the dressing area and the pole ear area on both sides, and broken belts after rolling and slitting.

[0003] For example, Chinese patent document CN 219292387 U discloses a tab calender for a battery electrode, comprising a front tension barrier assembly, a calender assembly and a rear swing roller assembly, wherein the front tension barrier assembly comprises a front guide roller, a pressure roller, a steel roller, a front swing roller and a tension roller, the calender assembly comprises a calender wheel, a transverse movement mechanism and a longitudinal movement mechanism, and the rear swing roller assembly mechanism comprises a rear swing roller and a rear guide roller; the prior art utilizes the front tension barrier assembly to provide a stable tension for the calender assembly, the longitudinal movement mechanism drives the calender wheel to move longitudinally to adjust the rolling pressure, and the transverse movement mechanism drives the calender wheel to move laterally to different positions for rolling, which can effectively reduce the uneven thickness of the electrode sheet after rolling and the generation of wrinkles, resulting in the breakage of the foil in the subsequent production process, thereby saving materials and improving production efficiency.

[0004] However, the above-mentioned prior art battery pole piece tab calender has the following defects during use: the calendering assembly includes a calendering wheel, a transverse movement mechanism and a longitudinal movement mechanism, and the only calendering wheel can easily cause the pole piece tab to rupture due to the front and rear tension difference during pre-extension or shutdown, thereby affecting the pre-extension effect; secondly, the tension partition of this structure is small, the pre-extension effect of the tab is poor, and there are many skirt defects formed at the junction of the dressing area and the tab area. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a tab pre-stretching device which is capable of increasing tension isolation and improving pre-stretching effect, and which is not easy to break the tab of the pole piece during pre-stretching or shutdown.

[0006] The technical solution of the utility model is: to provide a pole ear pre-stretching device, including a passing roller, a rubber roller, a traction roller, a first swing roller, a first tension roller, a pre-delay roller system assembly including at least a support roller and a working roller, at least one pre-delay assembly, and a second swing roller and a second tension roller, which are arranged in sequence along the movement direction of the pole piece, and at least one pre-delay assembly, and a second swing roller and a second tension roller; a gap is provided between the traction roller and the rubber roller for the pole piece to pass through; the pre-delay assembly includes a support crossbeam, at least two transversely arranged pre-delay roller assemblies, a pre-delay rubber roller assembly located between two adjacent pre-delay roller assemblies, a pre-delay spacing adjustment assembly for adjusting the spacing between the pre-delay roller assemblies, and a pre-delay guide assembly, the pre-delay roller assembly is arranged on the support crossbeam through the pre-delay spacing adjustment assembly, the pre-delay rubber roller assembly is arranged on the support crossbeam, and the pre-delay guide assembly is located on one side of the pre-delay roller assembly.

[0007] As an improvement of the present invention, the pre-delay spacing adjustment assembly includes a screw pair, a number of supports equal to the number of the pre-delay roller assemblies, a locking cylinder located on the supports, and a first guide rail and a first slider located on a cross beam of the supports. The supports are arranged on the screw pair and are moved by the screw pair. Each of the supports is connected to the corresponding pre-delay roller assembly, and the bottom of each pre-delay roller assembly can be slidably arranged on the first guide rail through the first slider.

[0008] As an improvement of the utility model, the pre-delay roller assembly includes a pre-delay roller and a hydraulic cylinder. The pre-delay roller is connected to the piston rod of the hydraulic cylinder. The hydraulic cylinder can realize longitudinal movement of the pre-delay roller, thereby controlling the gap between the pre-delay roller and the working roller.

[0009] As an improvement of the utility model, the pre-delayed rubber roller assembly includes a pre-delayed rubber roller and a first cylinder. The pre-delayed rubber roller is connected to the piston rod of the first cylinder. The longitudinal movement of the pre-delayed rubber roller can be achieved through the first cylinder, thereby controlling the gap between the pre-delayed rubber roller and the working roller.

[0010] As an improvement of the utility model, it further comprises a pre-delay guide assembly, the pre-delay guide assembly comprises a second guide rail and a second slider, and the pre-delay roller is slidably arranged on the second guide rail via the second slider.

[0011] As an improvement of the utility model, it also includes a pre-delay cleaning component arranged on one side of the pre-delay roller system component, the pre-delay cleaning component includes a wiping roller block, a wiping roller wool felt and a second cylinder, the piston rod of the second cylinder is connected to the wiping roller block, the wiping roller wool felt is arranged at the front end of the wiping roller block, and the wiping roller wool felt is controlled by the second cylinder to be pressed against the working roller and the supporting roller, thereby cleaning the roller surface of the pre-delay working area of ​​the working roller and the supporting roller.

[0012] As an improvement of the utility model, it also includes two adjusting rollers and a manual displacement slide for adjusting the height of the adjusting rollers, the adjusting rollers are located on both sides of the working roller, and the relative height of the adjusting roller and the working roller is adjusted by the manual displacement slide.

[0013] As an improvement of the utility model, it also includes a sprocket assembly, which includes a chain and a plurality of sprockets, the plurality of sprockets are arranged along the movement direction of the pole piece, the chain is arranged along the direction of the plurality of sprockets, and meshes with the plurality of sprockets one by one.

[0014] As an improvement of the utility model, it further comprises an adjusting device, which is located between the rubber roller and the traction roller and is used to adjust the distance between the rubber roller and the traction roller.

[0015] As an improvement of the present invention, the adjusting device comprises a first lead screw and an inclined block, and both ends of the rubber roller are arranged on the inclined block. The inclined block is driven by the first lead screw to move forward and backward, thereby adjusting the distance between the rubber roller and the traction roller.

[0016] The utility model comprises a passing roller, a rubber roller, a traction roller, a first swing roller, a first tension roller, a pre-delay roller system assembly including at least a support roller and a working roller, at least one pre-delay assembly, and a second swing roller and a second tension roller, which are sequentially arranged along the moving direction of the pole piece; a gap is provided between the traction roller and the rubber roller for the pole piece to pass through; the pre-delay assembly comprises a support crossbeam, at least two transversely arranged pre-delay roller assemblies, a pre-delay rubber roller assembly located between two adjacent pre-delay roller assemblies, a pre-delay spacing adjustment assembly for adjusting the spacing between the pre-delay roller assemblies, and a pre-delay guide assembly, the pre-delay roller assembly is arranged on the support crossbeam through the pre-delay spacing adjustment assembly, the pre-delay rubber roller assembly is arranged on the support crossbeam, and the pre-delay guide assembly is located on one side of the pre-delay roller assembly. When the utility model is in use, the pole piece passes through the roller and enters between the traction roller and the rubber roller. The rubber roller and the traction roller isolate the tension and speed of the pole piece from the previous interval. Then the pole piece passes through the first swing roller and the first tension roller. The pole piece comes to the working roller and the pre-delay roller assembly and the pre-delay rubber roller assembly with a specific speed and tension. Since there are at least two pre-delay roller assemblies, and the pre-delay rubber roller assembly between two adjacent pre-delay roller assemblies, the pre-delay roller assembly is driven by the pre-delay spacing adjustment assembly to move laterally to a suitable position, and the pole piece ear passes through the working roller and the pre-delay roller of the pre-delay roller assembly. Pressure is applied to the pre-delay rollers, so that the pole piece ear is pre-delayed. In this way, even if the pole piece ear is pre-delayed or stopped, it will not be broken due to the front and rear tension difference. In addition, this structure increases the tension separation, the pole ear pre-delay effect is better, and the skirt defect formed at the junction of the dressing area and the pole ear area can be reduced. Therefore, the utility model has the advantages that the pole piece ear is not easy to break during pre-delay or stop, and can increase the tension separation and improve the pre-delay effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a longitudinal sectional view of an embodiment of the utility model.

[0018] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the pre-delay component.

[0019] Figure 3 yes Figure 2 A front view schematic diagram of .

[0020] Figure 4 yes Figure 3 Schematic side view of .

[0021] Figure 5 yes Figure 1 A three-dimensional schematic diagram of .

[0022] Figure 6 yes Figure 1 A three-dimensional diagram from another perspective. DETAILED DESCRIPTION

[0023] See also Figures 1 to 6 , Figures 1 to 6 Disclosed is an embodiment of a tab pre-stretching device, a tab pre-stretching device, comprising a roller 1, a rubber roller 2, a traction roller 3, a first swing roller 41, a first tension roller 51, a pre-stretching roller system component 7 including a support roller 71 and a working roller 72, at least one pre-stretching component 6, and a second swing roller 42 and a second tension roller 52, which are arranged in sequence along the moving direction of the pole piece 100; in the utility model, tension sensors (not visible in the figure) are respectively installed on the first tension roller 51 and the second tension roller 52; in the present embodiment, there are two first swing rollers 41, which are respectively located in front and behind the first tension roller 51, and the pre-stretching component 6 has two, one is located between the first swing roller 41 and the pre-delay roller assembly 7, the other is located between the pre-delay roller assembly 7 and the second swing roller 42, the second swing roller 42 also has two, respectively located in front and behind the second tension roller 52, the traction roller 3 is located below the rubber roller 2, and a gap is provided between the traction roller 3 and the rubber roller 2 for the pole piece 100 to pass through. In the utility model, the over roller 1, the rubber roller 2, the traction roller 3, the first swing roller 41, the first tension roller 51, the second swing roller 42 and the second tension roller 52 provide stable tension for the pre-delay assembly 6; the pre-delay roller assembly 7 provides support for the pre-delay assembly 6.

[0024] In the utility model, specifically, the pre-delay component 6 includes a support crossbeam 60, at least two transversely arranged pre-delay roller components 61, a pre-delay rubber roller component 62 located between two adjacent pre-delay roller components 61, a pre-delay spacing adjustment component 63 for adjusting the spacing between the pre-delay roller components 61, and a pre-delay guide component 64. In this embodiment, there are three pre-delay roller components 61 and two pre-delay rubber roller components 62, which are respectively located between the adjacent pre-delay roller components 61. The pre-delay roller component 61 is arranged on the support crossbeam 60 through the pre-delay spacing adjustment component 63, the pre-delay rubber roller component 62 is arranged on the support crossbeam 60, and the pre-delay guide component 64 is located on one side of the pre-delay roller component 61.

[0025] In the present utility model, specifically, the pre-delay spacing adjustment component 63 includes a screw pair 630, a support 631 equal in number to the pre-delay roller assembly 61 (three supports in this embodiment), a locking cylinder 632 located on the support 631 (three in this embodiment), and a first guide rail 633 and a first slider 634 located on the support crossbeam 60. The support 631 is arranged on the screw pair 630 and is driven to move by the screw pair 630. Each of the supports 631 is connected to the corresponding pre-delay roller assembly 61. The bottom of each pre-delay roller assembly 61 can be slidably arranged on the first guide rail 632 through the first slider 633. In the present utility model, In the embodiment, specifically, the screw pair 630 includes a second screw 6301 and three nuts 6302, each of the supports 631 is arranged on the second screw 6301 through the corresponding nut 6302, and a handle 6303 is provided at the end of the second screw 6301 to facilitate the operation of the second screw 6301. When working, the locking cylinder 632 is started, and the second screw 6301 is rotated by the handle 6303, and the nut 6302 is fixed, thereby driving the pre-delay roller assembly 61 connected to the support 631 to move horizontally; in this embodiment, the number of the pre-delay roller assembly 61 can also be multiple, which is not limited here. Multiple supports 631 are installed on the same second screw 6301, and any one or more locking cylinders 632 can be started according to needs, and the pre-delay roller assembly 61 corresponding to the rotating screw can achieve lateral movement. Compared with the prior art, the present invention realizes the adjustment of the spacing of a single pre-delay roller or multiple pre-delay rollers, and the operation is more flexible. In addition, the pre-delay roller spacing adjustment of the present invention does not require a reducer and a motor, and the adjustment effect is consistent and the cost is lower. In the present invention, the structure of the first guide rail 633 and the first slider 634 can ensure the stability of the pre-delay roller assembly 61 during the lateral movement and the position accuracy of the tab pre-delay.

[0026] In the utility model, preferably, the pre-delay roller assembly 61 includes a pre-delay roller 611 and a hydraulic cylinder 612, and the pre-delay roller 611 is connected to the piston rod of the hydraulic cylinder 612. Specifically, the pre-delay roller 611 is fixedly connected to the first slider 633, and the hydraulic cylinder 612 is fixedly connected to the support 631. In this embodiment, the longitudinal movement of the pre-delay roller 611 can be achieved by controlling the lifting and lowering of the piston rod of the hydraulic cylinder 612 through a servo hydraulic system (not visible in the figure), thereby controlling the gap between the pre-delay roller 611 and the working roller 72, thereby controlling the extension and thickness of the pole piece and ear after pre-delay.

[0027] In the utility model, preferably, the pre-stretching rubber roller assembly 62 includes a pre-stretching rubber roller 621 and a first cylinder 622. Specifically, the first cylinder 622 is installed on the support beam 60, and the pre-stretching rubber roller 621 is connected to the piston rod of the first cylinder 622. Specifically, in this embodiment, the longitudinal movement of the pre-stretching rubber roller 621 can be achieved by controlling the lifting and lowering of the piston rod of the first cylinder 622 through an electromagnetic valve, thereby controlling the gap between the pre-stretching rubber roller 621 and the working roller 72.

[0028] In the present invention, preferably, it also includes a pre-delay guide assembly 64, the pre-delay guide assembly 64 includes a second guide rail 641 and a second slider 642, the pre-delay roller 611 is slidably arranged on the second guide rail 641 through the second slider 642, and the structure of the second guide rail 641 and the second slider 642 can also ensure the stability of the pre-delay roller assembly 61 during the lateral movement and the position accuracy of the tab pre-delay. In addition, the present invention makes the contact lines of multiple groups of pre-delay rollers 611 and the working rollers 72 collinear in a straight line, ensures the uniform wear of the pre-delay rollers 611 and the working rollers 72, improves the structural rigidity of the pre-delay roller assembly 61, and makes the tabs of each region extend uniformly under the same pressure.

[0029] In the present invention, preferably, it also includes a pre-delay cleaning assembly 65 arranged on one side of the pre-delay roller assembly 7, the pre-delay cleaning assembly 65 includes a wiping roller block 651, a wiping roller wool felt 652 and a second cylinder 653, the piston rod of the second cylinder 653 is connected to the wiping roller block 651, the wiping roller wool felt 652 is arranged at the front end of the wiping roller block 651, and the lifting and lowering of the piston rod of the second cylinder 653 can control the wiping roller wool felt 652 to be pressed against the working roller 72 and the support roller 71, so as to clean the roller surface of the pre-delay working area of ​​the working roller 72 and the support roller 71. The pre-delay cleaning assembly 65 can prevent the accumulation of debris on the pole piece and the pole ear on the pre-delay roller assembly 7 during the long-term use of the pole ear pre-delay device, thereby reducing the problem of roller surface damage or raised hard points, reducing pole ear defects, and reducing the belt break rate.

[0030] In the utility model, preferably, it also includes two adjusting rollers 81 and a manual displacement slide 82 for adjusting the height of the adjusting roller 81, wherein the adjusting rollers 81 are respectively located on both sides of the working roller 72, and the relative height of the adjusting roller 81 and the working roller 72 is adjusted by the manual displacement slide 82, thereby changing the wrap angle between the pole piece and the working roller 72.

[0031] In the present invention, preferably, a sprocket assembly 9 is further included, wherein the sprocket assembly 9 includes a chain 91 and a plurality of sprockets 92, wherein the plurality of sprockets 92 are arranged along the movement direction of the pole piece 100, and the chain 91 is arranged along the direction of the plurality of sprockets 92 and meshes with the plurality of sprockets 92 one by one. The chain 91 is used to guide the pole piece 100, thereby reducing manual threading, and reducing threading time and difficulty.

[0032] In the present invention, preferably, an adjusting device 20 is further included, and the adjusting device 20 is located between the rubber roller 2 and the traction roller 3, and is used to adjust the distance between the rubber roller 2 and the traction roller 3. In the present invention, specifically, the adjusting device 20 includes a first lead screw 201 and an inclined block 202, and both ends of the rubber roller 2 are arranged on the inclined block 202, and the inclined block 202 is driven by the first lead screw 201 to move forward and backward, thereby adjusting the distance between the rubber roller 2 and the traction roller 3.

[0033] In the utility model, the pre-delay roller assembly 7 also includes a reducer and a plum blossom coupling (not visible in the figure), the working roller 72 is connected to the output end of the reducer through a plum blossom coupling, and the output end of the driving motor is connected to the reducer through a transmission, thereby providing power for driving the working roller 72, the support roller 71 is located above the working roller 72 and is in close contact with the working roller 72, the diameter of the support roller 71 is larger than the diameter of the working roller 72, and provides rigid support for the working roller 73 and the ear pre-delay, thereby preventing the working roller 72 and the pre-delay roller assembly 61 from deforming.

[0034] The specific working process of the utility model is as follows: the pole piece 100 passes through the roller 1 and enters between the traction roller 3 and the rubber roller 2. The rubber roller 2 and the traction roller 3 isolate the tension and speed of the pole piece 100 from the previous interval. Then the pole piece 100 passes through the first swing roller 41 and the first tension member 51. The PLC receives feedback from the tension sensor to control the proportional valve (the proportional valve controls the output of the low-friction cylinder to make the first swing roller 41 swing) and the driving motor of the traction roller 3 to make the pole piece 100 come to between the working roller 72 and the pre-delay roller 611 and the pre-delay rubber roller 621 with a specific speed and tension. The pre-delay roller assembly 61 is driven by the pre-delay spacing adjustment assembly 62 to move horizontally to a suitable position. The pre-delay rubber roller 621 is pushed by the cylinder 622 and pressed against the working roller 72 to form a new tension cutoff. The pre-delay roller 611 The hydraulic cylinder 612 below is controlled by the servo hydraulic system to output appropriate pre-delay pressure to act between the pre-delay roller 611 and the working roller 72. The pole piece and the pole ear are pressurized between the working roller 72 and the pre-delay roller 611 to be pre-delayed. The pre-delay cleaning component 65 completes the cleaning of the roller surface of the working roller 72 and the support roller 71. The pre-delay rubber roller 621 and the working roller 72 isolate the pole piece 100 from the tension and speed of the previous interval. Subsequently, the pole piece 100 passes through the second tension roller 52 and the second swing roller 42. The PLC receives feedback from the tension sensor to control the proportional valve (the proportional valve controls the output of the low-friction cylinder to make the second swing roller 42 swing) and the driving motor of the working roller 72 to make the pole piece leave the pole ear pre-delay device with a specific speed and tension, thereby completing the pre-delay of the pole piece 100.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tab pre-stretching device, comprising a roller (1), a rubber roller (2), a traction roller (3), a first swing roller (41), a first tension roller (51), a pre-stretching roller assembly (7) including at least a support roller (71) and a working roller (72), at least one pre-stretching assembly (6), and a second swing roller (42) and a second tension roller (52) arranged in sequence along the moving direction of a pole piece (100); a gap is provided between the traction roller (3) and the rubber roller (2) for the pole piece (100) to pass through; the characteristics are as follows: The pre-delay component (6) comprises a support crossbeam (60), at least two transversely arranged pre-delay roller components (61), a pre-delay rubber roller component (62) located between two adjacent pre-delay roller components (61), a pre-delay spacing adjustment component (63) for adjusting the spacing between the pre-delay roller components (61), and a pre-delay guide component (64), wherein the pre-delay roller component (61) is arranged on the support crossbeam (60) via the pre-delay spacing adjustment component (63), the pre-delay rubber roller component (62) is arranged on the support crossbeam (60), and the pre-delay guide component (64) is located on one side of the pre-delay roller component (61).

2. The tab pre-extension device according to claim 1, characterized in that: The pre-delay spacing adjustment component (63) comprises a lead screw pair (630), a number of supports (631) equal to the number of the pre-delay roller components (61), a locking cylinder (632) located on the support (631), and a first guide rail (633) and a first slider (634) located on the support crossbeam (60); the support (631) is arranged on the lead screw pair (630) and is driven to move by the lead screw pair (630); each of the supports (631) is connected to a corresponding pre-delay roller component (61); and the bottom of each pre-delay roller component (61) can be slidably arranged on the first guide rail (632) via the first slider (633).

3. The tab pre-extension device according to claim 2, characterized in that: The pre-delay roller assembly (61) comprises a pre-delay roller (611) and a hydraulic cylinder (612); the pre-delay roller (611) is connected to a piston rod of the hydraulic cylinder (612); the hydraulic cylinder (612) can realize longitudinal movement of the pre-delay roller (611), thereby controlling the gap between the pre-delay roller (611) and the working roller (72).

4. The tab pre-extension device according to claim 3, characterized in that: The pre-delayed rubber roller assembly (62) comprises a pre-delayed rubber roller (621) and a first cylinder (622); the pre-delayed rubber roller (621) is connected to a piston rod of the first cylinder (622); the pre-delayed rubber roller (621) can be moved longitudinally by the first cylinder (622), thereby controlling the gap between the pre-delayed rubber roller (621) and the working roller (72).

5. The tab pre-extension device according to claim 4, characterized in that: It also includes a pre-delay guide assembly (64), the pre-delay guide assembly (64) including a second guide rail (641) and a second slider (642), and the pre-delay roller (611) is slidably arranged on the second guide rail (641) via the second slider (642).

6. The tab pre-stretching device according to any one of claims 1 to 5, characterized in that: It also includes a pre-delay cleaning component (65) arranged on one side of the pre-delay roller system component (7), the pre-delay cleaning component (65) including a wiping roller block (651), a wiping roller wool felt (652) and a second cylinder (653), the piston rod of the second cylinder (653) is connected to the wiping roller block (651), the wiping roller wool felt (652) is arranged at the front end of the wiping roller block (651), and the wiping roller wool felt (652) is controlled by the second cylinder (653) to be pressed against the working roller (72) and the supporting roller (71), thereby cleaning the roller surface of the pre-delay working area of ​​the working roller (72) and the supporting roller (71).

7. The tab pre-stretching device according to any one of claims 1 to 5, characterized in that: It also comprises two adjusting rollers (81) and a manual displacement slide (82) for adjusting the height of the adjusting rollers (81), wherein the adjusting rollers (81) are respectively located on both sides of the working roller (72), and the relative height between the adjusting rollers (81) and the working rollers (72) is adjusted by the manual displacement slide (82).

8. The tab pre-stretching device according to any one of claims 1 to 5, characterized in that: It also includes a sprocket assembly (9), the sprocket assembly (9) including a chain (91) and a plurality of sprockets (92), the plurality of sprockets (92) being arranged along the movement direction of the pole piece (100), the chain (91) being arranged along the direction of the plurality of sprockets (92) and meshing with the plurality of sprockets (92) one by one.

9. The tab pre-stretching device according to any one of claims 1 to 5, characterized in that: It also comprises an adjusting device (20), wherein the adjusting device (20) is located between the rubber roller (2) and the traction roller (3) and is used to adjust the distance between the rubber roller (2) and the traction roller (3).

10. The tab pre-extension device according to claim 9, characterized in that: The adjusting device (20) comprises a first lead screw (201) and an inclined block (202), with both ends of the rubber roller (2) being arranged on the inclined block (202). The first lead screw (201) drives the inclined block (202) to move forward and backward, thereby adjusting the distance between the rubber roller (2) and the traction roller (3).

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