Roll welding device for pole piece and pole lug

Abstract

The utility model discloses a roll welding device for a pole piece and a pole lug, which comprises a pole piece unwinding module, two foil unwinding modules and two welding modules, and the pole piece unwinding module is used for unwinding a pole piece material belt; the two foil unwinding modules are arranged on the two sides of the width direction of the pole piece material belt correspondingly, and the foil unwinding modules can move in the width direction of the pole piece material belt; the two welding modules and the two foil unwinding modules are arranged on the same side respectively, and the two welding modules are located on the discharging sides of the corresponding tab foil unwinding modules respectively and can move in the width direction of the pole piece material belt. The two groups of foil unwinding modules are used for conveying tab foils to the inner side and the outer side of a pole piece material belt respectively, and the two groups of welding modules are used for welding the tab foils on the inner side and the outer side of the pole piece material belt respectively. The foil unwinding module and the welding module can move in the width direction of the pole piece material belt so as to adjust and adapt to the width of the pole lug foil, and the welding efficiency of the pole pieces and the pole lugs on the two sides is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to a pole piece and pole ear rolling welding device. Background Art

[0002] Pole piece and lug welding is a new process for lithium battery processing. Compared with the original technical process with copper (aluminum) foil as the base material, the base material of the current process is mostly non-metallic materials such as CP (Cellulose Propionate) plus a small amount of copper (aluminum) at the lug. The battery cells produced by this new process are lighter, the number of turns of the battery cells under the same volume will be more, the metal content is low, and the safety is better. The pole piece and lug welding of lithium batteries requires the copper (aluminum) foil lugs to be welded to the front and back of the pole piece. The difficulty lies in the accuracy of the welding position of the positive and negative lugs, the overlap of the positive and negative lugs, the welding speed, the welding power and the firmness after welding.

[0003] In the related art, a pole piece and tab welding device cannot achieve welding of the pole tabs on both sides in the width direction of the pole piece strip. After the welding of the pole tab on one side is completed, the direction of the strip needs to be adjusted to weld the pole tab on the other side. This is inefficient and cumbersome to operate. At the same time, the pole piece and tab welding device cannot adapt to pole piece strips of different widths and has a narrow scope of application. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a pole piece and tab rolling welding device, which can adapt to pole piece strips of different widths and effectively improve the welding efficiency of pole pieces and tabs on both sides.

[0005] According to the first aspect of the present invention, a pole piece and tab rolling welding device includes:

[0006] A pole piece unwinding module, used for unwinding pole piece strips;

[0007] Two foil unwinding modules are arranged on both sides of the width direction of the electrode strip, and the foil unwinding modules can move in the width direction of the electrode strip;

[0008] The two welding modules are respectively arranged on the same side as the two foil unwinding modules and are located at the discharge side of the corresponding foil unwinding modules and can move in the width direction of the electrode strip.

[0009] According to an embodiment of the utility model, a pole piece and tab rolling welding device has at least the following beneficial effects: the pole piece and tab rolling welding device is provided with a pole piece unwinding module, two foil unwinding modules and two welding modules, the pole piece unwinding module is used to convey the pole piece strip, the two foil unwinding modules convey the tab foils for the inner and outer sides of the pole piece strip respectively, and the two welding modules weld the tab foils for the inner and outer sides of the pole piece strip respectively, wherein the foil unwinding module can move in the width direction of the pole piece strip to adjust the width of the foil, and the welding module can also move in the width direction of the pole piece strip to adjust the width of the foil. The pole piece and tab rolling welding device can adapt to pole piece strips of different widths, effectively improving the welding efficiency of the pole piece and tabs on both sides.

[0010] According to some embodiments of the present invention, the welding module comprises:

[0011] An ultrasonic roll welding unit assembly, used for welding the foil and the electrode strip;

[0012] An ultrasonic roll welding unit assembly, used for welding the foil and the electrode strip;

[0013] And a first installation movable seat assembly, used to drive the ultrasonic roll welding unit assembly to move in the width direction of the pole piece strip, the first installation movable seat assembly comprising:

[0014] A first fixing seat;

[0015] A first sliding seat, which is slidably matched with the first fixed seat through a first screw rod assembly, and the ultrasonic seam welding unit assembly is arranged on the first sliding seat;

[0016] and a first driving member, wherein the first driving member is drivingly connected to the first screw rod assembly, and the first screw rod assembly can drive the first sliding seat to move relative to the first fixed plate under the action of the first driving member.

[0017] According to some embodiments of the present utility model, the first driving member is a hand wheel, and the hand wheel is drivingly connected to the screw of the screw assembly.

[0018] According to some embodiments of the present utility model, the first installation movable seat assembly further comprises:

[0019] A ruler assembly is used to calibrate the displacement of the first sliding seat relative to the first fixed seat.

[0020] According to some embodiments of the present invention, the scale assembly includes:

[0021] A ruler body, arranged on the first fixing seat;

[0022] A guide shaft, disposed on the first fixing seat;

[0023] a guide block, disposed on the first sliding seat, having an extension portion extending toward the guide shaft, the extension portion being in sliding engagement with the guide shaft;

[0024] A locking handle is arranged on the guide block, and the locking handle rotates under the action of an external force to lock and fix the guide block relative to the guide shaft;

[0025] A pointer is arranged on the guide block, and the needle portion of the pointer points to the ruler body.

[0026] According to some embodiments of the present invention, the first driving component of one of the two welding modules is a hand wheel, and the first driving component of the other welding module is a servo motor.

[0027] According to some embodiments of the present invention, the foil unwinding module comprises:

[0028] The upper foil unwinding module and the lower foil unwinding module are respectively arranged on both sides of the electrode strip in the thickness direction.

[0029] According to some embodiments of the present utility model, the upper foil unwinding module and the lower foil unwinding module both include:

[0030] A foil unwinding assembly, used for unwinding the tab foil;

[0031] and a second installation movable seat assembly, used for driving the foil unwinding assembly to move in the width direction of the pole sheet strip, comprising:

[0032] a second fixing seat;

[0033] a second sliding seat, which is slidably matched with the second fixed seat via a second screw rod assembly, and the foil unwinding assembly is arranged on the second sliding seat;

[0034] and a second driving member, wherein the second driving member is drivingly connected to the second screw assembly, and the second screw assembly can drive the second sliding seat to move relative to the second fixed seat under the action of the second driving member.

[0035] According to some embodiments of the utility model, a rolling support assembly is arranged on a side of the second mounting movable seat assembly close to the pole piece strip, and the rolling support assembly is used to support a portion of the second sliding seat moving out of the second fixed seat.

[0036] According to some embodiments of the present invention, the rolling support assembly includes at least two roller groups, and each of the roller groups includes at least one roller.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0039] Figure 1 It is a schematic diagram of a pole piece and pole ear roll welding device according to an embodiment of the utility model;

[0040] Figure 2 This is a schematic diagram of a welding module according to an embodiment of the present invention;

[0041] Figure 3 yes Figure 2 A schematic diagram of a first mounting movable seat assembly of a welding module is shown;

[0042] Figure 4 It is a schematic diagram of a foil unwinding module according to an embodiment of the utility model.

[0043] Reference numerals:

[0044] Mounting frame 100;

[0045] Pole piece unwinding module 200;

[0046] Foil unwinding module 300, inner unwinding module 310, outer unwinding module 320, upper foil unwinding module 330, lower foil unwinding module 340;

[0047] Welding module 400, inner welding module 410, outer welding module 420;

[0048] Ultrasonic roll welding unit assembly 500;

[0049] The first installation movable seat assembly 600, the first fixed seat 610, the first guide rail 611, the first slider 612, the first sliding seat 620, the first driving member 630, the hand wheel 631, the first screw assembly 640, the ruler assembly 650, the ruler body 651, the ruler 6510, the guide shaft 652, the guide block 653, the locking handle 654, the pointer 655, the limit block 660, the buffer block 670, and the top block 680;

[0050] The second installation movable seat assembly 700, the second fixed seat 710, the second guide rail 711, the second slider 712, the second sliding seat 720, the third guide rail 721, the third slider 722, the second screw assembly 730, the second driving member 740, the rolling support assembly 750, and the roller 751;

[0051] Foil unwinding assembly 800, moving plate 810, deviation correction driving unit 820, third driving member 830, over-roller unit 840, unwinding shaft 850;

[0052] Servo motor 900. DETAILED DESCRIPTION

[0053] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0054] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "more" is more than two groups, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0056] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0057] Pole piece and lug welding is a new process for lithium battery processing. Compared with the original technical process with copper (aluminum) foil as the base material, the base material of the current process is mostly non-metallic materials such as CP (Cellulose Propionate) plus a small amount of copper (aluminum) at the lug. The battery cells produced by this new process are lighter, the number of turns of the battery cells under the same volume will be more, the metal content is low, and the safety is better. The pole piece and lug welding of lithium batteries requires the copper (aluminum) foil lugs to be welded to the front and back of the pole piece. The difficulty lies in the accuracy of the welding position of the positive and negative lugs, the overlap of the positive and negative lugs, the welding speed, the welding power and the firmness after welding.

[0058] In the related art, the pole piece and tab welding equipment can usually only weld one side of the pole piece material strip in the width direction. After welding one side of the pole piece material strip, the direction of the material strip is adjusted, that is, the material strip is horizontally turned 180 degrees, and the pole piece and tab welding equipment welds the other side. However, this type of pole piece and tab welding equipment cannot weld the pole tabs on both sides of the pole piece material strip on one device, and the efficiency is low. Adjusting the direction of the material strip involves disassembling and installing the material strip, and the operation is cumbersome. At the same time, since the welding device of the pole piece and tab welding equipment is fixed, it cannot adapt to pole piece material strips of different widths, and the scope of application is narrow.

[0059] In view of the technical problems existing in the prior art, the utility model proposes a pole piece and tab rolling welding device, which is provided with a pole piece unwinding module, two sets of foil unwinding modules and two sets of welding modules. The pole piece unwinding module is used to convey the pole piece material strip, the two sets of foil unwinding modules convey the foil for the inner side and the outer side of the pole piece material strip respectively, and the two sets of welding modules weld the foil for the inner side and the outer side of the pole piece material strip respectively, wherein the foil unwinding module can move in the width direction of the pole piece material strip to adjust the width of the foil, and the welding module can also move in the width direction of the pole piece material strip to adjust the width of the foil. The pole piece and tab rolling welding device can adapt to pole piece material strips of different widths, and effectively improve the welding efficiency of the pole piece and tabs on both sides.

[0060] Reference Figure 1 The pole piece and tab rolling welding device comprises a mounting frame 100, a pole piece unwinding module 200, two sets of foil unwinding modules 300 and two sets of welding modules 400. The pole piece unwinding module 200, the two sets of foil unwinding modules 300 and the two sets of welding modules 400 are all arranged on the mounting frame 100. Among them, the two sets of foil unwinding modules 300 are respectively configured as an inner unwinding module 310 and an outer unwinding module 320. Each set of inner unwinding modules 310 is provided with two, namely, an inner upper foil unwinding module 330 and an inner lower foil unwinding module 340, for conveying foil at the upper and lower edges of the inner side of the pole piece material strip. Each set of outer unwinding modules 320 is provided with two, namely, an outer upper foil unwinding module 330 and an outer lower foil unwinding module 340, for conveying foil at the upper and lower edges of the outer side of the pole piece material strip. The two welding modules 400 are respectively used to weld the inner and outer tabs of the electrode strip, and the two welding modules 400 are respectively configured as the inner welding module 410 and the outer welding module 420. The electrode unwinding module 200 is arranged at the initial end in the conveying direction of the electrode strip, and along the conveying direction of the electrode, the inner unwinding module 310, the inner welding module 410, the outer unwinding module 320, and the outer welding module 420 are sequentially arranged.

[0061] It should be noted that the positions of the inner unwinding module 310 and the outer unwinding module 320, and the inner welding module 410 and the outer welding module 420 are not limited to the above layout, and their positions can be adjusted. For example, when the inner unwinding module 310 is located at the front end of the outer unwinding module 320 in the electrode sheet conveying direction, the welding module 400 preferentially welds the inner electrode ears of the electrode sheet strip, otherwise, the welding module 400 preferentially welds the outer electrode ears of the electrode sheet strip.

[0062] Reference Figure 2 The welding module 400 includes an ultrasonic roll welding unit assembly 500 and a first mounting movable seat assembly 600. The ultrasonic roll welding unit assembly 500 is arranged on the first mounting movable seat assembly 600. The ultrasonic roll welding unit assembly 500 is used to weld the pole ears of the pole piece strip. The first mounting movable seat assembly 600 is used to drive the ultrasonic roll welding unit assembly 500 to move in the width direction of the pole piece strip, so that the ultrasonic roll welding unit assembly 500 can adapt to the width of the pole piece strip and realize precise welding.

[0063] Reference Figure 3 The first installation movable seat assembly 600 includes a first fixed seat 610, a first sliding seat 620 and a first driving member 630. The first sliding seat 620 is slidably matched with the first fixed seat 610 through a first screw rod assembly 640. The ultrasonic roll welding unit assembly 500 is arranged on the first sliding seat 620. The first driving member 630 is transmission-connected with the first screw rod assembly 640 and can drive the first screw rod assembly 640 so that the first screw rod assembly 640 drives the first sliding seat 620 to move relative to the first fixed seat 610.

[0064] It can be understood that when it is necessary to adapt to a wider pole piece strip, the first driving member 630 drives the first sliding seat 620 to move away from the mounting frame 100, so that the ultrasonic roll welding unit assembly 500 follows the first sliding seat 620 to move, and the ultrasonic roll welding unit assembly 500 is closer to the pole ear at the edge of the pole piece strip, thereby adapting to a wider pole piece strip; conversely, the ultrasonic roll welding unit assembly 500 follows the first sliding seat 620 to move toward the mounting frame 100, and the ultrasonic roll welding unit assembly 500 is closer to the pole ear at the edge of the pole piece strip, thereby adapting to a narrower pole piece strip.

[0065] It should be noted that the first fixed seat 610 is provided with a first guide rail 611 and a first slider 612. Two first guide rails 611 are provided in parallel, and each first guide rail 611 is provided with two first sliders 612. The first sliding seat 620 is connected to the first slider 612. Limit blocks 660 are provided at both ends of the first guide rail 611. A buffer block 670 is provided on the limit block 660. The first sliding seat 620 is provided with a top block 680 that cooperates with the buffer block 670, and the first sliding seat 620 abuts against the buffer block 670 through the top block 680.

[0066] It can be understood that the limit block 660 is used to limit the displacement distance of the first sliding seat 620 to prevent the first sliding seat 620 from separating from the first guide rail 611, and the buffer block 670 is used to buffer the collision between the limit block 660 and the top block 680 to improve the stability of the first sliding seat 620 during movement.

[0067] It should be noted that the first drive member 630 is configured as a handwheel 631, and the handwheel 631 is connected to the screw of the first screw assembly 640. The first drive member 630 is configured as a handwheel 631, which is convenient for debugging the first installation movable seat assembly 600 on site, according to the position of the pole piece strip. The first drive member 630 is not limited to the above-mentioned specific implementation. In other embodiments, the first drive member 630 can also be configured as a servo motor 900.

[0068] It should be noted that the first installation movable seat assembly 600 further includes a ruler assembly 650, which is used to calibrate the displacement of the first sliding seat 620 relative to the first fixed seat 610. The ruler assembly 650 includes a ruler body 651, a guide shaft 652, a guide block 653, a locking handle 654 and a pointer 655. The ruler body 651 is arranged on the first fixed seat 610, and the ruler body 651 is configured as a scale 6510 with scales. The guide shaft 652 is arranged on the first fixed seat 610, and the guide shaft 652 is parallel to the ruler body 651. The guide block 653 is arranged on the first sliding seat 620. The guide block 653 has an extension portion extending toward the guide shaft 652, and the extension portion is slidably matched with the guide shaft 652, that is, the extension portion is provided with a through hole, and the guide shaft 652 passes through the through hole. The locking handle 654 is arranged on the guide block 653, and the locking handle 654 can be rotated under the action of an external force to lock and fix the guide block 653 relative to the guide shaft 652, and the locking handle 654 is rotated so that the locking handle 654 presses the guide shaft 652 to achieve fixation. The structure of the guide portion is not limited to the structure of the extension portion described above. In other embodiments, the guide portion can also replace the through hole of the extension portion with a card slot, and the guide shaft 652 can be movably arranged in the card slot. The pointer 655 is disposed on the guide block 653 and points to the ruler 6510 , so as to indicate the scale of the ruler 6510 .

[0069] It can be understood that the function of the scale assembly 650 is to detect the moving distance of the first sliding seat 620 when the first installation movable seat assembly 600 is manually adjusted, that is, to detect the moving distance of the ultrasonic roll welding unit assembly 500 installed on the first sliding seat 620. For example, the first driving member 630 is manually adjusted to rotate the screw rod, the first sliding seat 620 moves, and the pointer 655 of the scale assembly 650 moves with the first sliding seat 620, and the pointer 655 points to the scale of the ruler 6510, so that the position of the first sliding seat 620 can be accurately adjusted.

[0070] Reference Figure 4 The upper foil unwinding module 330 and the lower foil unwinding module 340 both include a foil unwinding assembly 800 and a second mounting movable seat assembly 700. The foil unwinding assembly 800 is used for unwinding the tab foil, and the foil unwinding assembly 800 is disposed on the second mounting movable seat assembly 700 and is used to drive the foil unwinding assembly 800 to move in the width direction of the tab material strip.

[0071] It should be noted that the second installation movable seat assembly 700 includes a second fixed seat 710, a second sliding seat 720, a second screw assembly 730 and a second driver. The second sliding seat 720 is slidably matched with the second fixed seat 710 through the second screw assembly 730, and the second fixed seat 710 is also provided with a second guide rail 711 and a second slider 712 located on the second guide rail 711, the second sliding seat 720 is connected with the second slider 712, the foil unwinding assembly 800 is installed on the second sliding seat 720, and the second driving member 740 is transmission-connected with the second screw assembly 730, and the second screw assembly 730 can drive the second sliding seat 720 to move relative to the second fixed seat 710 under the action of the first driving member 630. The second driving member 740 is configured as a servo motor 900. It can be understood that the driving mode of the second sliding seat 720 is not limited to the driving modes listed above, and can also be a driving mode of a cylinder.

[0072] It should be noted that a rolling support assembly 750 is provided on one side of the second mounting movable seat assembly 700 close to the pole piece material strip, and the rolling support assembly 750 is used to support the second sliding seat 720 to move out of the second fixed seat 710. The rolling support assembly 750 includes two roller groups, which are symmetrically arranged and respectively located on both sides of the end of the second fixed seat 710. The heights of the two roller groups are parallel, and each roller group is provided with a roller 751. It can be understood that the structure of the rolling support assembly 750 is not limited to the above structure. In other embodiments, the rolling support assembly 750 can be provided with multiple roller groups, at least two or more, and each roller group can be provided with multiple rollers 751.

[0073] It should be noted that the foil unwinding assembly 800 includes a moving plate 810, a deflection correction driving unit 820, a third driving member 830, an unwinding shaft 850 and a roller portion 840. A third guide rail 721 is provided on the top of the second sliding seat 720, and a third slider 722 is specifically provided on the third guide rail 721. The moving plate 810 is connected to the third slider 722. The deflection correction driving unit 820 is provided on the moving plate 810 and a driving end of the deflection correction driving unit 820 is connected to the mounting frame 100. The deflection correction driving unit 821 is provided on the moving plate 810. 0 Push or pull the mounting frame 100 to move the moving plate 810 away from or close to the mounting frame 100, the unwinding shaft 850 is arranged below the moving plate 810, the third driving member 830 is arranged above the moving plate 810 and is connected to the unwinding shaft 850 through a transmission member, the unwinding shaft 850 is used to discharge the foil, the over-roller part 840 is fixed above the moving plate 810 and can move with the moving plate 810, and the over-roller part 840 is used to adjust the direction of the pole piece strip and press the pole piece strip. When the over-roller part 840 moves with the moving plate 810, the position of the pole piece strip in the width direction can be adjusted. The deviation correction drive part 820 is configured as a cylinder.

[0074] It can be understood that for the outer unwinding module 320, the unwinding shaft 850 of the foil unwinding assembly 800 is farther away from the mounting frame 100, and in addition, the width adjustment position of the electrode material strip needs to be coordinated. By adding a rolling support assembly 750 to the second mounting movable seat assembly 700, the movement of the foil unwinding assembly 800 located on the outside is made more stable.

[0075] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A pole piece and pole ear roll welding device, characterized in that: include: A pole piece unwinding module, used for unwinding pole piece strips; Two foil unwinding modules are arranged on both sides of the width direction of the electrode strip, and the foil unwinding modules can move in the width direction of the electrode strip; The two welding modules are respectively arranged on the same side as the two foil unwinding modules and are located at the discharge side of the corresponding foil unwinding modules and can move in the width direction of the electrode strip.

2. The pole piece and tab rolling welding device according to claim 1, characterized in that: The welding module comprises: An ultrasonic roll welding unit assembly, used for welding the foil and the electrode strip; And a first installation movable seat assembly, used to drive the ultrasonic roll welding unit assembly to move in the width direction of the pole piece strip, the first installation movable seat assembly comprising: A first fixing seat; A first sliding seat, which is slidably matched with the first fixed seat through a first screw rod assembly, and the ultrasonic seam welding unit assembly is arranged on the first sliding seat; and a first driving member, wherein the first driving member is drivingly connected to the first screw rod assembly, and the first screw rod assembly can drive the first sliding seat to move relative to the first fixed plate under the action of the first driving member.

3. The pole piece and tab rolling welding device according to claim 2, characterized in that: The first driving member is a hand wheel, and the hand wheel is drivingly connected to the screw of the screw assembly.

4. The pole piece and tab rolling welding device according to claim 3, characterized in that: The first installation mobile seat assembly also includes: A ruler assembly is used to calibrate the displacement of the first sliding seat relative to the first fixed seat.

5. The pole piece and tab rolling welding device according to claim 4, characterized in that: The scale assembly comprises: A ruler body, arranged on the first fixing seat; A guide shaft, disposed on the first fixing seat; a guide block, disposed on the first sliding seat, having an extension portion extending toward the guide shaft, the extension portion being in sliding engagement with the guide shaft; A locking handle is arranged on the guide block, and the locking handle rotates under the action of an external force to lock and fix the guide block relative to the guide shaft; A pointer is arranged on the guide block, and the needle portion of the pointer points to the ruler body.

6. The pole piece and tab rolling welding device according to claim 2, characterized in that: The first driving component of one of the two welding modules is a hand wheel, and the first driving component of the other welding module is a servo motor.

7. The pole piece and tab rolling welding device according to claim 1, characterized in that: The foil unwinding module comprises: The upper foil unwinding module and the lower foil unwinding module are respectively arranged on both sides of the electrode strip in the thickness direction.

8. The pole piece and tab rolling welding device according to claim 7, characterized in that: The upper foil unwinding module and the lower foil unwinding module both include: A foil unwinding assembly, used for unwinding the tab foil; And a second installation movable seat assembly, used for driving the foil unwinding assembly to move in the width direction of the pole sheet strip, the second installation movable seat assembly comprising: a second fixing seat; a second sliding seat, which is slidably matched with the second fixed seat via a second screw rod assembly, and the foil unwinding assembly is arranged on the second sliding seat; and a second driving member, wherein the second driving member is drivingly connected to the second screw assembly, and the second screw assembly can drive the second sliding seat to move relative to the second fixed seat under the action of the second driving member.

9. The pole piece and tab rolling welding device according to claim 8, characterized in that: A rolling support assembly is arranged on one side of the second installation movable seat assembly close to the pole piece strip, and the rolling support assembly is used to support the part of the second sliding seat moving out of the second fixed seat.

10. The pole piece and tab rolling welding device according to claim 9, characterized in that: The rolling support assembly includes at least two roller groups, and each roller group includes at least one roller.

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