Active friction-reducing welding assembly

Abstract

The application discloses an active type butt welding assembly with small friction, which comprises a pressing shaft roller core, a large roller, a bottom welding wheel and a tab seat are sequentially connected in rotation along the axial direction, a first rotation connection unit is arranged between the large roller and the pressing shaft roller core, a second rotation connection unit is arranged between the bottom welding wheel and the tab seat and the pressing shaft roller core, the bottom welding wheel and the tab seat rotate synchronously, and the whole of the bottom welding wheel and the tab seat rotates independently relative to the large roller. The first rotation connection unit and the second rotation connection unit are arranged, on one hand, the speed of the upper and lower surfaces of the conductive film can be ensured to be consistent, and on the other hand, the speed of the conductive film at the composite current collector and the tab can be ensured to be consistent, so that the speed of the whole conductive film tends to be consistent, the whole conductive film is in a flat and unfolded state during welding, the welding quality is ensured, the defective products are reduced, and the yield is improved.

Description

Technical Field

[0001] This invention relates to the field of composite current collector production technology, and more specifically, to an active welding assembly with low friction. Background Technology

[0002] Composite current collectors are battery materials with a "sandwich" structure, consisting of an inner polymer layer, a middle conductive metal layer, and an outer layer of corrosion-resistant materials such as ceramics or plastics. The inner polymer layer is the positive electrode, the conductive metal layer is the negative electrode, and the outer ceramic or plastic layer provides insulation and protection. The advantages of composite current collectors are that they offer high energy density and good cycle life, while also providing sufficient overcharge protection, stable high-current discharge capability, and excellent safety performance. They can be widely used in high-performance battery fields such as solar cells and lithium-ion batteries. Compared to traditional aluminum or copper foil, composite current collectors can reduce battery costs and improve energy density and safety performance. To collect the current from the metal plating on both sides of the polymer layer, tabs are typically welded to both surfaces.

[0003] During the welding process, the composite current collector needs to be traction-driven. This is achieved by placing a pressure roller above the composite current collector and a welding roller below it. The pressure roller and the welding roller clamp the composite current collector, and driving them to rotate causes the composite current collector to move within the welding machine. Due to manufacturing and installation errors, it is difficult to ensure that the linear speeds of the driving roller and the welding roller at the composite current collector are consistent, which can easily lead to speed differences between the upper and lower parts of the composite current collector. In addition, the welding roller includes a large guide roller, a bottom welding roller, and an electrode lug seat. Due to manufacturing and installation errors, speed differences can easily occur in the large guide roller, the bottom welding roller, and the electrode lug seat, making it difficult to ensure the overall speed consistency of the welding roller. This results in speed differences in the width direction of the composite current collector, which can easily cause wrinkles and film breaks in the composite current collector, affecting the welding quality.

[0004] The above shortcomings need to be improved. Summary of the Invention

[0005] To address the problem that existing composite current collectors are prone to wrinkling or film breakage due to speed differences between the upper and lower surfaces and in the width direction during traction welding, this invention provides an active welding assembly with low friction.

[0006] The technical solution of this invention is as follows:

[0007] A low-friction active welding assembly includes a pressure roller core. The pressure roller core is rotatably connected in sequence along the axial direction to a large pass roller, a bottom welding wheel, and an electrode lug seat. A first rotatable connection unit is provided between the large pass roller and the pressure roller core. A second rotatable connection unit is provided between the bottom welding wheel and the electrode lug seat and the pressure roller core. The bottom welding wheel and the electrode lug seat rotate synchronously, and the bottom welding wheel and the electrode lug seat rotate independently relative to the large pass roller.

[0008] The aforementioned low-friction active bearing assembly includes a first rotating connection unit comprising a first end rotating mechanism disposed at the first end of the large roller. The first end rotating mechanism includes a bearing adapter block supporting the first end of the large roller. A first bearing is connected between the bearing adapter block and the pressure roller core. The bearing adapter block contacts the outer circular surface and end face of the outer ring of the first bearing. A first bearing retaining ring is disposed on the side of the first bearing away from the bearing adapter block. The first bearing retaining ring contacts the end face of the inner ring of the first bearing. The first bearing retaining ring is sleeved on the pressure roller core.

[0009] The aforementioned low-friction active bearing assembly includes a first rotating connection unit comprising a second-end rotating mechanism disposed at the second end of the large roller. The second-end rotating mechanism includes an inner ring sleeved on the pressure roller core. A second bearing is disposed between the inner ring and the large roller. The large roller contacts the outer circular surface and end face of the outer ring of the second bearing. One end of the inner ring abuts against the shoulder of the pressure roller core, and the other end of the inner ring abuts against a second bearing retaining ring. A washer is disposed between the second bearing and the second bearing retaining ring, and the washer contacts the end face of the inner ring of the second bearing.

[0010] Furthermore, the second rotating connection unit includes a mandrel, which includes a first step for supporting and limiting the bottom welding wheel and a second step for supporting and limiting the pole lug seat. A third bearing is connected between the mandrel and the pressure roller core. The mandrel abuts against the second bearing retaining ring on the side facing the first end of the pressure roller core. A fourth bearing is provided on the side of the mandrel facing the second end of the pressure roller core. A first locking nut is provided on the side of the fourth bearing away from the mandrel. The first locking nut is threadedly connected to the pressure roller core.

[0011] Furthermore, the third bearing is a thrust needle roller bearing, the outer surface of the third bearing contacts the mandrel, and the inner surface of the third bearing contacts the pressure roller core.

[0012] In the aforementioned low-friction active bearing assembly, a first bearing seat is rotatably connected to the first end of the pressure roller core, a fifth bearing is provided between the pressure roller core and the first bearing seat, one end of the fifth bearing contacts the shoulder of the pressure roller core, and the other end of the fifth bearing abuts against a second locking nut, which is threadedly connected to the pressure roller core.

[0013] In the aforementioned low-friction active bearing assembly, a second bearing seat is rotatably connected to the second end of the pressure roller core, and a sixth bearing is connected between the second bearing seat and the pressure roller core. The outer ring of the sixth bearing is in contact with the second bearing seat on one side facing the second end of the pressure roller core, and a bearing end cap is provided on the other side of the sixth bearing. The bearing end cap is connected to the second bearing seat by fasteners.

[0014] In the aforementioned low-friction active welding assembly, the outer diameter of the large pass roller is not greater than the outer diameter of the bottom welding wheel and the electrode lug seat, and the outer diameter of the bottom welding wheel and the electrode lug seat is 1-1.1 times the outer diameter of the large pass roller.

[0015] In the aforementioned low-friction active welding assembly, the first end of the pressure roller core is connected to a motor via a coupling.

[0016] Furthermore, a speed reducer is connected between the motor and the coupling.

[0017] According to the above-described scheme, the beneficial effects of this invention are that, by setting a first rotating connecting unit and a second rotating connecting unit, it can ensure that the speed of the upper and lower surfaces of the conductive film tends to be consistent, and on the other hand, it can ensure that the speed of the conductive film at the composite current collector and the tab tends to be consistent, thereby ensuring that the overall speed of the conductive film tends to be consistent, so that the conductive film is in a flat and unfolded state during welding, ensuring welding quality, reducing defects, and improving yield. Attached Figure Description

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

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a top view of the structure of the present invention;

[0021] Figure 3 for Figure 2Schematic diagram of the cross-sectional structure at point AA;

[0022] Figure 4 for Figure 3 A schematic diagram of the first local structure in the diagram;

[0023] Figure 5 for Figure 3 The second partial structure diagram.

[0024] The reference numerals in the figures are as follows: 1. Pressure roller core; 2. Large roller; 3. Bottom welding wheel; 4. Pole lug seat; 5. First rotating connection unit; 51. First end rotating mechanism; 511. Bearing adapter block; 512. First bearing; 513. First bearing retaining ring; 52. Second end rotating mechanism; 521. Inner ring; 522. Second bearing; 523. Second bearing retaining ring; 524. Washer ring; 6. Motor; 7. Second rotating connection unit; 71. Spindle; 72. Third bearing; 73. Fourth bearing; 74. First locking nut; 8. First bearing seat; 81. Fifth bearing; 82. Second locking nut; 9. Second bearing seat; 91. Sixth bearing; 92. Bearing end cover; 10. Reducer; 11. Coupling. Detailed Implementation

[0025] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention 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 only used to explain the present invention and are not intended to limit the present invention.

[0026] It should be noted that when a component is referred to as "fixed," "set," or "connected" to another component, it may be located directly or indirectly on that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first," "second," etc., are used for ease of description only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "Many" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0027] Please see Figures 1 to 3According to one embodiment of the present invention, a low-friction active welding assembly includes a pressure roller core 1. The pressure roller core 1 is rotatably connected in the axial direction to a large pass roller 2, a bottom welding wheel 3, and an electrode lug seat 4. A first rotating connection unit 5 is provided between the large pass roller 2 and the pressure roller core 1. A second rotating connection unit 7 is provided between the bottom welding wheel 3 and the electrode lug seat 4 and the pressure roller core 1. The bottom welding wheel 3 and the electrode lug seat 4 rotate synchronously, and the bottom welding wheel 3 and the electrode lug seat 4 rotate independently relative to the large pass roller 2.

[0028] In this embodiment, during operation, the large roller 2 supports the composite current collector, the tab holder 4 supports the tabs of the composite current collector, and the bottom welding wheel 3 supports the connecting belt between the composite current collector and the tabs. A pressure roller is positioned above the composite current collector, and the pressure roller and the welding assembly clamp the composite current collector. The pressure roller and the welding assembly each have independent drive devices. The outer diameter of the pressure roller is comparable to the outer diameters of the large roller 2, bottom welding wheel 3, and tab holder 4 in the welding assembly; therefore, the rotational speeds of the drive devices of the pressure roller and the welding assembly are comparable. However, due to the difficulty in ensuring that the outer diameters of the pressure roller and the large roller 2, bottom welding wheel 3, and tab holder 4 in the welding assembly are completely identical, and due to assembly errors, there is a difference in the linear velocity of the pressure roller and the welding assembly at the composite current collector.

[0029] When the linear velocity of the pressure roller at the composite current collector is relatively high, the velocity of the upper surface of the composite current collector is also relatively high, and the velocity of the lower surface of the composite current collector is almost the same as that of the upper surface. Since the large roller 2, the bottom welding roller 3, and the electrode lug 4 are rotatably connected to the pressure roller core 1, under the influence of the frictional resistance between the large roller 2, the bottom welding roller 3, and the electrode lug 4 and the composite current collector, the linear velocity of the large roller 2, the bottom welding roller 3, and the electrode lug 4 at the conductive film tends to be consistent with that of the composite current collector. That is, the rotational speed of the large roller 2, the bottom welding roller 3, and the electrode lug 4 exceeds the rotational speed of the pressure roller core 1, ensuring that the velocities of the upper and lower surfaces of the composite current collector tend to be consistent, reducing defects such as wrinkles and film breaks that occur during the welding of the composite current collector.

[0030] When the linear velocity of the pressure roller at the composite current collector is relatively slow, the velocity of the upper surface of the composite current collector is also relatively slow, while the velocity of the lower surface of the composite current collector is almost the same as that of the upper surface. Since the large roller 2, the bottom welding wheel 3, and the electrode lug 4 are rotatably connected to the pressure roller core 1, under the influence of the frictional resistance between the large roller 2, the bottom welding wheel 3, and the electrode lug 4 and the composite current collector, the linear velocity of the large roller 2, the bottom welding wheel 3, and the electrode lug 4 at the conductive film is consistent with that of the composite current collector. That is, the rotational speed of the large roller 2, the bottom welding wheel 3, and the electrode lug 4 is lower than that of the pressure roller core 1, ensuring that the velocities of the upper and lower surfaces of the composite current collector tend to be consistent, reducing defects such as wrinkles and film breaks that occur during the welding of the composite current collector.

[0031] In addition, a first rotating connection unit 5 is set on the pressure roller core 1 to connect the large roller 2, and a second rotating connection unit 7 is set to connect the bottom welding wheel 3 and the electrode lug seat 4. This allows the large roller 2, the bottom welding wheel 3, and the electrode lug seat 4 to rotate relatively independently. Since the large roller 2, the bottom welding wheel 3, and the electrode lug seat 4 have different support positions, the wear degree of the large roller 2, the bottom welding wheel 3, and the electrode lug seat 4 is different, and the outer diameter has a certain difference. The large roller 2, the bottom welding wheel 3, and the electrode lug seat 4 can rotate relatively independently, so that the linear velocity of the bottom surface of the composite current collector and the electrode lug tends to be consistent, reducing welding defects.

[0032] This embodiment, by setting the first rotating connecting unit 5 and the second rotating connecting unit 7, can ensure that the speed of the composite current collector on the upper and lower surfaces tends to be consistent, and can also ensure that the speed of the composite current collector at the main body and the tab tends to be consistent, thereby ensuring that the overall speed of the composite current collector tends to be consistent, so that the composite current collector is in a flat and unfolded state during welding, ensuring welding quality, reducing defects, and improving yield.

[0033] Please see Figure 4 and Figure 5 In a preferred embodiment, the first rotating connection unit 5 includes a first end rotating mechanism 51 disposed at the first end of the large roller 2. The first end rotating mechanism 51 includes a bearing adapter block 511 supporting the first end of the large roller 2. A first bearing 512 is connected between the bearing adapter block 511 and the pressure roller core 1. The bearing adapter block 511 contacts the outer circular surface and end face of the outer ring of the first bearing 512. A first bearing retaining ring 513 is disposed on the side of the first bearing 512 away from the bearing adapter block 511. The first bearing retaining ring 513 contacts the end face of the inner ring of the first bearing 512. The first bearing retaining ring 513 is sleeved on the pressure roller core 1.

[0034] The first rotating connection unit 5 includes a second-end rotating mechanism 52 disposed at the second end of the large roller 2. The second-end rotating mechanism 52 includes an inner ring 521 sleeved on the pressure roller core 1. A second bearing 522 is disposed between the inner ring 521 and the large roller 2. The large roller 2 contacts the outer circular surface and end face of the outer ring of the second bearing 522. One end of the inner ring 521 abuts against the shoulder of the pressure roller core 1. The other end of the inner ring 521 abuts against the second bearing retaining ring 523. A washer 524 is disposed between the second bearing 522 and the second bearing retaining ring 523. The washer 524 contacts the end face of the inner ring of the second bearing 522.

[0035] In this embodiment, the first end of the large roller 2 is rotatably connected to the pressure roller core 1 via a first end rotation mechanism 51, and the second end of the large roller 2 is rotatably connected to the pressure roller core 1 via a second end rotation mechanism 52. The first bearing 512 and the second bearing 522 primarily bear radial force and are both deep groove ball bearings. The first bearing 512 is axially limited by a bearing adapter block 511 and a first bearing retaining ring 513. The bearing adapter block 511 and the first bearing retaining ring 513 are located on opposite sides of the first bearing 512 along the axial direction. The bearing adapter block 511 limits the outer ring of the first bearing 512, and the first bearing retaining ring 513 limits the inner ring of the second bearing 522, ensuring that the position of the first bearing 512 on the pressure roller core 1 remains unchanged. The bearing adapter block 511 allows different large rollers 2 and different pressure roller cores 1 to be connected, facilitating the replacement of the large roller 2 and the pressure roller core 1 according to production needs. The bearing adapter block 511 is connected to one end support ring of the large roller 2 on the side away from the first bearing 512, and limits its movement. The second bearing 522 is axially limited by the large roller 2 and the washer ring 524. The support ring and washer ring 524 at the second end of the large roller 2 are located on both sides of the second bearing 522. The support ring at the second end of the large roller 2 limits the outer ring of the second bearing 522, and the washer ring 524 limits the inner ring of the second bearing 522. In addition, the second bearing 522 is connected to the pressure roller core 1 through the inner ring 521. The inner ring 521 is limited by the shoulder on the pressure roller core 1 and the second bearing retaining ring 523, and the second bearing 522 axially limits the washer ring 524.

[0036] Please see Figure 5 In a preferred embodiment, the second rotating connection unit 7 includes a mandrel 71, which includes a first step for supporting and limiting the bottom welding wheel 3 and a second step for supporting and limiting the pole lug seat 4. A third bearing 72 is connected between the mandrel 71 and the pressure roller core 1. The mandrel 71 abuts against a second bearing retaining ring 523 on the side facing the first end of the pressure roller core 1. The second bearing retaining ring 523 is a bearing and is mainly subjected to axial force, so a thrust ball bearing is used. A fourth bearing 73 is provided on the side of the mandrel 71 facing the second end of the pressure roller core 1. A first locking nut 74 is provided on the side of the fourth bearing 73 away from the mandrel 71. The first locking nut 74 is threadedly connected to the pressure roller core 1.

[0037] The third bearing 72 is a thrust needle roller bearing. The outer surface of the third bearing 72 contacts the mandrel 71, and the inner surface of the third bearing 72 contacts the pressure roller core 1.

[0038] In this embodiment, the mandrel 71 is provided with a first step and a second step. The outer diameter of the first step is approximately equal to the inner diameter of the bottom welding wheel 3, and the width of the first step is less than the width of the bottom welding wheel 3, thereby supporting and limiting the bottom welding wheel 3. The outer diameter of the second step is less than the outer diameter of the first step, and the outer diameter of the second step is approximately equal to the inner diameter of the electrode lug 4, and the width of the second step is less than the width of the electrode lug 4, thereby supporting and limiting the electrode lug 4. The mandrel 71, the bottom welding wheel 3, and the electrode lug 4 are connected by fasteners such as bolts. The third bearing 72 is used to support the mandrel 71, the bottom welding wheel 3, and the electrode lug 4, and requires a large radial support force; therefore, a needle roller bearing that can provide a large radial support force is used. The third bearing 72 is also used to axially limit the mandrel 71; therefore, a thrust needle roller bearing is used. The two sides of the mandrel 71 are axially limited by the second limiting retaining ring 523 and the fourth bearing 73, respectively. The other side of the fourth bearing 73 is limited by the first locking nut 74. The fourth bearing 73 is mainly subjected to axial force; therefore, a thrust bearing is used.

[0039] Please see Figures 3 to 5 In a preferred embodiment, a first bearing 512 seat is rotatably connected to the first end of the pressure roller core 1, and a fifth bearing 81 is provided between the pressure roller core 1 and the first bearing 512 seat. One end of the fifth bearing 81 contacts the shoulder of the pressure roller core 1, and the other end of the fifth bearing 81 abuts against a second locking nut 82. The second locking nut 82 is threadedly connected to the pressure roller core 1.

[0040] The second end of the pressure roller core 1 is rotatably connected to a second bearing 522 seat. A sixth bearing 91 is connected between the second bearing 522 seat and the pressure roller core 1. The outer ring of the sixth bearing 91 is in contact with the second bearing 522 seat on one side facing the second end of the pressure roller core 1. A bearing end cover 92 is provided on the other side of the sixth bearing 91. The bearing end cover 92 is connected to the second bearing 522 seat by fasteners.

[0041] In this embodiment, the pressure roller core 1 is rotatably mounted on the first bearing 512 seat and the second bearing 522 seat. The driving component, the first bearing 512 seat, and the second bearing 522 seat are mounted on the base of the welding machine, so that the pressure roller core 1 can be driven to rotate by the driving component. The first bearing 512 seat and the pressure roller core 1 are rotatably connected by a fifth bearing 81, and the fifth bearing 81 is axially limited by the second locking nut 82 and the pressure roller core 1. The fifth bearing 81 needs to bear axial and radial loads and is an angular contact bearing. The second bearing 522 seat and the pressure roller core 1 are rotatably connected by a sixth bearing 91. The sixth bearing 91 is axially limited by the shoulder of the pressure roller core 1 and the bearing end cover 92. The sixth bearing 91 mainly bears radial loads and is a ball bearing.

[0042] In a preferred embodiment, the outer diameter of the large-diameter roller 2 is not greater than the outer diameter of the bottom welding roller 3 and the electrode lug seat 4, and the outer diameter of the bottom welding roller 3 and the electrode lug seat 4 is 1-1.1 times the outer diameter of the large-diameter roller 2. In this embodiment, the outer diameter of the bottom welding roller 3 and the electrode lug seat 4 is not less than the outer diameter of the large-diameter roller 2, so that the bottom welding roller 3 and the electrode lug seat 4 can better support the connecting strip and electrode lug of the composite current collector. This is because the thickness of the composite current collector at the connecting strip and the electrode lug is less than that of the composite current collector, thus providing better support for the composite current collector and ensuring welding quality.

[0043] Please see Figure 1 and Figure 3 In a preferred embodiment, a motor 6 is connected to the first end of the pressure roller core 1 via a coupling 11. A reducer 10 is connected between the motor 6 and the coupling 11. In this embodiment, the motor 6 acts as a driver. After being reduced in speed by the reducer 10, the torque of the motor 6 increases, driving the pressure roller core 1 to rotate via the coupling 11, thereby driving the large roller 2, the bottom welding wheel 3, and the electrode lug seat 4 to rotate. In practical applications, the motor 6 is generally a servo motor 6, which can precisely control the speed and further ensure the consistency of the speed on the upper and lower surfaces of the composite current collector.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-friction active welding assembly, characterized in that, The device includes a pressure roller core, which is axially rotatably connected to a large guide roller, a bottom welding wheel, and an electrode lug seat. A first rotatable connection unit is provided between the large guide roller and the pressure roller core. A second rotatable connection unit is provided between the bottom welding wheel and the electrode lug seat and the pressure roller core. The bottom welding wheel and the electrode lug seat are rotatably connected to the large guide roller. The outer diameter of the large guide roller is not greater than the outer diameter of the bottom welding wheel and the electrode lug seat, and the outer diameter of the bottom welding wheel and the electrode lug seat is 1-1.1 times the outer diameter of the large guide roller. The first rotating connection unit includes a first end rotating mechanism disposed at the first end of the large roller. The first end rotating mechanism includes a bearing adapter block supporting the first end of the large roller. A first bearing is connected between the bearing adapter block and the pressure roller core. The bearing adapter block contacts the outer circular surface and end face of the outer ring of the first bearing. A first bearing retaining ring is disposed on the side of the first bearing away from the bearing adapter block. The first bearing retaining ring contacts the end face of the inner ring of the first bearing. The first bearing retaining ring is sleeved on the pressure roller core. The first rotating connection unit includes a second-end rotating mechanism disposed at the second end of the large roller. The second-end rotating mechanism includes an inner ring sleeved on the pressure roller core. A second bearing is disposed between the inner ring and the large roller. The large roller contacts the outer circular surface and end face of the outer ring of the second bearing. One end of the inner ring abuts against the shoulder of the pressure roller core. The other end of the inner ring abuts against a second bearing retaining ring. A washer is disposed between the second bearing and the second bearing retaining ring. The washer contacts the end face of the inner ring of the second bearing. The second rotating connection unit includes a mandrel, which includes a first step for supporting and limiting the bottom welding wheel and a second step for supporting and limiting the pole lug seat. A third bearing is connected between the mandrel and the pressure roller core. The third bearing is a thrust needle roller bearing. The outer surface of the third bearing contacts the mandrel, and the inner surface of the third bearing contacts the pressure roller core. The mandrel abuts against the second bearing retaining ring on the side facing the first end of the pressure roller core. A fourth bearing is provided on the side of the mandrel facing the second end of the pressure roller core. A first locking nut is provided on the side of the fourth bearing away from the mandrel. The first locking nut is threadedly connected to the pressure roller core.

2. The low-friction active welding assembly according to any one of claims 1, characterized in that, The first end of the pressure roller core is rotatably connected to a first bearing seat. A fifth bearing is provided between the pressure roller core and the first bearing seat. One end of the fifth bearing contacts the shoulder of the pressure roller core, and the other end of the fifth bearing abuts against a second locking nut. The second locking nut is threadedly connected to the pressure roller core.

3. A low-friction active welding assembly according to any one of claims 1, characterized in that, The second end of the pressure roller core is rotatably connected to a second bearing seat. A sixth bearing is connected between the second bearing seat and the pressure roller core. The outer ring of the sixth bearing is in contact with the second bearing seat on one side facing the second end of the pressure roller core. A bearing end cap is provided on the other side of the sixth bearing. The bearing end cap is connected to the second bearing seat by fasteners.

4. A low-friction active welding assembly according to any one of claims 1, characterized in that, The first end of the pressure roller core is connected to a motor via a coupling.

5. The low-friction active welding assembly according to claim 4, characterized in that, A speed reducer is connected between the motor and the coupling.

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