Active welding assembly with speed compensation

Abstract

The application discloses an active bearing and welding assembly with speed compensation, which comprises a pressure shaft roller core, a large roller, a bottom welding wheel and a tab seat are sequentially rotationally connected with the pressure shaft roller core in the axial direction, a rotation connecting unit is arranged between the large roller, the bottom welding wheel and the tab seat and the pressure shaft roller core, a one-way locking mechanism is arranged on the rotation connecting unit, the one-way locking mechanism limits the bottom welding wheel and the tab seat from being reversely rotated relative to the pressure shaft roller core, and the rotating speed of the pressure shaft roller core is not greater than the rotating speed of the pressure roller. The rotating speed of the pressure shaft roller core is set to be close to the rotating speed of the pressure roller, the speed difference between the pressure shaft roller core and the pressure roller is reduced, the speed difference can be compensated through the friction force between the bearing and welding assembly and the composite current collector, and therefore the stable and flat movement of the composite current collector in the welding machine can be ensured.

Description

Technical Field

[0001] This invention relates to the field of composite current collector welding technology, and more specifically, to an active welding assembly with speed compensation. 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. A pressure roller is set above the composite current collector, and a welding support roller is set below it. The pressure roller and the welding support roller clamp the composite current collector. Driving the pressure roller and the welding support roller to rotate causes the composite current collector to move in the welding machine. The welding support roller includes a large guide roller, a bottom welding wheel, and an electrode lug seat. Due to manufacturing and installation errors, and because the connecting strip and electrode lugs of the composite current collector are relatively narrow, the contact surface with the bottom welding wheel and the electrode lug seat is small, resulting in low friction. This easily leads to speed differences among the large guide roller, the bottom welding wheel, and the electrode lug seat, making it difficult to ensure the overall speed consistency of the welding support 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 speed differences in the width direction during traction welding, leading to wrinkles or film breakage, this invention provides an active welding assembly with speed compensation.

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

[0007] An active welding assembly with speed compensation includes a pressure roller core. The pressure roller core is rotatably connected axially to a large pass roller, a bottom welding wheel, and an electrode lug seat. A rotatable connection unit is provided between the large pass roller, the bottom welding wheel, and the electrode lug seat and the pressure roller core. A one-way locking mechanism is provided on the rotatable connection unit. The one-way locking mechanism restricts the bottom welding wheel and the electrode lug seat from reversing relative to the pressure roller core. The rotational speed of the pressure roller core is not greater than the rotational speed of the pressure roller.

[0008] The above-mentioned active welding assembly with speed compensation includes a first rotating connection unit between the large pass roller and the pressure roller core, and a second rotating connection unit 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 relatively independently from the large pass roller.

[0009] Furthermore, 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 first bearing disposed between the large roller and the pressure roller core. The large roller contacts the outer circular surface and end face of the outer ring of the first bearing. The first bearing is provided with a bearing retaining ring on the side facing the first end of the large roller. The bearing retaining ring contacts the end face of the inner ring of the first bearing. The bearing retaining ring is sleeved on the pressure roller core.

[0010] Furthermore, 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 seventh bearing. A washer is disposed between the second bearing and the seventh bearing. The washer contacts the end face of the inner ring of the second bearing.

[0011] Furthermore, the second rotating connection unit includes a mandrel, the mandrel having a first step on its outer side for supporting and limiting the bottom welding wheel and a second step on its outer side for supporting and limiting the pole lug seat. A third bearing is connected between the mandrel and 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.

[0012] Furthermore, the third bearing is a one-way bearing, the outer circular surface of the third bearing is in contact with the mandrel, and the inner circular surface of the third bearing is connected to the pressure roller core by a key.

[0013] In the aforementioned active bearing assembly with speed compensation, 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.

[0014] In the aforementioned active bearing assembly with speed compensation, 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.

[0015] In the aforementioned active welding assembly with speed compensation, 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.

[0016] In the aforementioned active welding assembly with speed compensation, a motor is connected to the first end of the pressure roller core via a coupling, and a reducer is connected between the motor and the coupling.

[0017] According to the above-described scheme, the beneficial effects of this invention are as follows: By rotatably connecting the large pass roller, the bottom welding roller, and the electrode lug seat to the pressure roller core, when the rotational speed of the pressure roller core is less than that of the pressure roller, the rotational speed of the pressure roller core approaches that of the pressure roller. The pressure roller core drives the bottom welding roller and the electrode lug seat to rotate through a one-way locking mechanism, making the composite current collector move at the same speed in the width direction. Furthermore, when the rotational speed of the pressure roller core is equal to that of the pressure roller, the pressure roller core drives the bottom welding roller and the electrode lug seat to rotate through the one-way locking mechanism, maintaining the same speed in the width direction of the composite current collector. By setting the rotational speed of the pressure roller core to approach that of the pressure roller, the speed difference between the two is reduced, and the friction between the welding assembly and the composite current collector can compensate for the speed difference, thereby ensuring the stable and smooth movement of the composite current collector in the welding machine. 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 2 Schematic 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. First bearing; 512. Bearing retaining ring; 52. Second end rotating mechanism; 521. Inner ring; 522. Second bearing; 523. Seventh bearing; 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 3An active welding assembly with speed compensation, as described in one embodiment of the present invention, 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 rotating connection unit is provided between the large pass roller 2, the bottom welding wheel 3, and the electrode lug seat 4 and the pressure roller core 1. A one-way locking mechanism is provided on the rotating connection unit. The one-way locking mechanism restricts the bottom welding wheel 3 and the electrode lug seat 4 from reversing relative to the pressure roller core 1. The rotational speed of the pressure roller core 1 is not greater than the rotational speed of the pressure roller.

[0028] In this embodiment, during operation, the large roller 2 supports the composite current collector body, the electrode lug seat 4 supports the electrode lugs of the composite current collector, and the bottom welding wheel 3 supports the connecting belt between the composite current collector body and the electrode lugs. 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 electrode lug seat 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 manufacturing errors, inconsistent wear and tear, and assembly errors, the outer diameters of the pressure roller and the welding assembly are not perfectly identical, resulting in differences in the linear velocities of the pressure roller and the welding assembly at the composite current collector. Since the rotational speed of the pressure roller core 1 is not greater than the rotational speed of the pressure roller, the linear velocities of the large roller 2, bottom welding wheel 3, and electrode lug seat 4 at the composite current collector are less than or equal to the linear velocity of the pressure roller 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 high, while the velocity of the lower surface is almost the same as that of the upper surface. Because the large roller 2, the bottom welding wheel 3, and the electrode lug seat 4 are rotatably connected to the pressure roller core 1, the contact area between the composite current collector body and the large roller 2 is relatively large due to the frictional resistance between the large roller 2, the bottom welding wheel 3, and the electrode lug seat 4 and the composite current collector. This results in a large frictional force, which can drive the large roller 2 to rotate synchronously with the pressure roller. The connecting strip and electrode lugs of the composite current collector are relatively narrow, resulting in a smaller contact area with the bottom welding wheel 3 and the electrode lug seat 4, and thus a smaller frictional force. Under the action of the one-way locking mechanism set on the rotating connection unit, the pressure roller core 1 drives the bottom welding wheel 3 and the electrode lug seat 4 to rotate. By setting the rotation speed of the pressure roller core 1 to be close to the rotation speed of the pressure roller, the speed difference between the two is reduced, so that the linear speed of the bottom welding wheel 3 and the electrode lug seat 4 at the conductive film is consistent with that of the composite current collector. This compensates for the speed of the composite current collector at the connecting belt and the electrode lug, so that there is no large speed difference due to insufficient friction. This ensures that the speed of the composite current collector in the width direction is consistent, and reduces defects such as wrinkles and film breaks in the composite current collector during welding.

[0030] When the linear velocity of the pressure roller at the composite current collector is equal to that of the large pass roller 2, the bottom welding roller 3, and the electrode lug seat 4 at the composite current collector, the contact area between the composite current collector body and the large pass roller 2 is larger, and the friction is greater. This can drive the large pass roller 2 and the pressure roller to rotate synchronously. Under the action of the one-way locking mechanism set on the rotating connection unit, the pressure roller core 1 can drive the bottom welding roller 3 and the electrode lug seat 4 to rotate. The speed of the composite current collector in the width direction tends to be consistent, reducing defects such as wrinkles and film breaks in the composite current collector during welding.

[0031] In this embodiment, by rotatably connecting the large roller 2, the bottom welding roller 3, and the electrode lug seat 4 to the pressure roller core 1, when the rotational speed of the pressure roller core 1 is less than that of the pressure roller, the rotational speed of the pressure roller core 1 approaches that of the pressure roller. The pressure roller core 1 drives the bottom welding roller 3 and the electrode lug seat 4 to rotate through a one-way locking mechanism, making the composite current collector move at the same speed in the width direction. And when the rotational speed of the pressure roller core 1 is equal to that of the pressure roller, the pressure roller core 1 drives the bottom welding roller 3 and the electrode lug seat 4 to rotate through a one-way locking mechanism, making the composite current collector maintain the same speed in the width direction. By setting the rotational speed of the pressure roller core 1 to approach that of the pressure roller, the speed difference between the two is reduced, and the speed difference can be compensated by the friction between the welding assembly and the composite current collector, thereby ensuring that the composite current collector moves stably and smoothly in the welding machine.

[0032] Please see Figure 4 and Figure 5 In a preferred embodiment, the rotating connection unit includes a first rotating connection unit 5 disposed between the large roller 2 and the pressure roller core 1, and a second rotating connection unit 7 disposed 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 roller 2.

[0033] 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. Due to the different support positions of the large roller 2, the bottom welding wheel 3, and the electrode lug seat 4, 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.

[0034] Please see Figure 4 and Figure 5In 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 first bearing 511 disposed between the large roller 2 and the pressure roller core 1. The large roller 2 contacts the outer circular surface and end face of the outer ring of the first bearing 511. The first bearing 511 has a bearing retaining ring 512 disposed on the side facing the first end of the large roller 2. The bearing retaining ring 512 contacts the end face of the inner ring of the first bearing 511. The bearing retaining ring 512 is sleeved on the pressure roller core 1.

[0035] 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 a seventh bearing 523. A washer 524 is disposed between the second bearing 522 and the seventh bearing 523. The washer 524 contacts the end face of the inner ring of the second bearing 522.

[0036] 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 511 and the second bearing 522 primarily bear radial force and are both deep groove ball bearings. The first bearing 511 is axially limited by the large roller 2 and the bearing retaining ring 512. The large roller 2 and the bearing retaining ring 512 are located on opposite sides of the first bearing 511 along the axial direction. The large roller 2 limits the outer ring of the first bearing 511, and the bearing retaining ring 512 limits the inner ring of the second bearing 522, ensuring that the position of the first bearing 511 on the pressure roller core 1 remains unchanged. The bearing retaining ring 512 is fastened to the pressure roller core 1 with screws. One side of the first bearing 511 is connected to one end support ring of the large roller 2 and limits its position. The second bearing 522 is axially limited by the large roller 2 and the washer 524. The support ring at the second end of the large roller 2 and the washer 524 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 524 limits the inner ring of the second bearing 522. The other end of the washer 524 abuts against the seventh bearing 523. 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 seventh bearing 523, and the second bearing 522 axially limits the washer 524.

[0037] Please see Figure 5The second rotating connection unit 7 includes a mandrel 71. The mandrel 71 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 on its outer side. A third bearing 72 is connected between the mandrel 71 and the pressure roller core 1. 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.

[0038] The third bearing 72 is a one-way bearing. The outer surface of the third bearing 72 is in contact with the mandrel 71, and the inner surface of the third bearing 72 is connected to the pressure roller core 1 by a key.

[0039] 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 smaller 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 also acts as a one-way locking mechanism; therefore, a one-way bearing is used. The one-way locking mechanism can also be provided separately, such as a ratchet mechanism. The two sides of the mandrel 71 are axially limited by the seventh bearing 523 and the fourth bearing 73 respectively. The other side of the fourth bearing 73 is limited by the first locking nut 74. The seventh bearing 523 and the fourth bearing 73 are mainly subjected to axial force, so they are both thrust bearings. The seventh bearing 523 allows the large roller 2 to rotate relatively independently relative to the bottom welding roller 3 and the pole lug seat 4.

[0040] Please see Figures 3 to 5 In a preferred embodiment, a first bearing 511 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 511 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.

[0041] 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.

[0042] In this embodiment, the pressure roller core 1 is rotatably mounted on the first bearing 511 seat and the second bearing 522 seat. The driving component, the first bearing 511 seat, and the second bearing 522 seat are mounted on the base of the welding machine, allowing the pressure roller core 1 to be driven to rotate by the driving component. The first bearing 511 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 both 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, which 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.

[0043] 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.

[0044] Please see Figure 1 and Figure 3 A motor 6 is connected to the first end of the pressure roller core 1 via a coupling 11, and 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 pole lug seat 4 to rotate. In practical applications, a servo motor 6 is used, which can precisely control the speed and further ensure the consistency of the speed in the width direction of the composite current collector.

[0045] 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. An active welding assembly with speed compensation, characterized in that, The device includes a pressure roller core, which is rotatably connected in the axial direction to a large guide roller, a bottom welding wheel, and an electrode lug seat. A rotatable connection unit is provided between the large guide roller, the bottom welding wheel, and the electrode lug seat and the pressure roller core. A one-way locking mechanism is provided on the rotatable connection unit. The one-way locking mechanism restricts the bottom welding wheel and the electrode lug seat from reversing relative to the pressure roller core. The rotational speed of the pressure roller core is not greater than the rotational speed of the pressure roller. The rotating connection unit includes a first rotating connection unit disposed between the large through roller and the pressure roller core, and a second rotating connection unit disposed between the bottom welding wheel and the entire electrode lug seat and the pressure roller core. The bottom welding wheel and the entire electrode lug seat rotate synchronously, and the entire bottom welding wheel and the entire electrode lug seat rotate relatively independently from the large through 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 first bearing disposed between the large roller and the pressure roller core. The large roller contacts the outer circular surface and end face of the outer ring of the first bearing. The first bearing is provided with a bearing retaining ring on the side facing the first end of the large roller. The bearing retaining ring contacts the end face of the inner ring of the first bearing. The 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 seventh bearing. A washer is disposed between the second bearing and the seventh bearing. 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 on the outer side 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. 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 active welding assembly with speed compensation according to claim 1, characterized in that, The third bearing is a one-way bearing. The outer surface of the third bearing is in contact with the mandrel, and the inner surface of the third bearing is connected to the pressure roller core by a key.

3. An active welding assembly with speed compensation according to any one of claims 1-2, 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.

4. An active welding assembly with speed compensation according to any one of claims 1-2, 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.

5. An active welding assembly with speed compensation according to any one of claims 1-2, characterized in that, The outer diameter of the large 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 roller.

6. An active welding assembly with speed compensation according to any one of claims 1-2, characterized in that, The first end of the pressure roller core is connected to a motor via a coupling, and a reducer is connected between the motor and the coupling.

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