Tab folding mechanism and welding system for composite current collector pole piece

Abstract

The utility model discloses a tab folding mechanism and a welding system for a composite current collector pole piece. The tab folding mechanism and the welding system are used for solving the technical problem that a tab A surface and a tab B surface of an existing composite current collector pole piece can be conducted only when the tab A surface and the tab B surface of the existing composite current collector pole piece are respectively welded with a conductive foil material. The tab folding mechanism comprises a supporting platform, a rotating assembly, a first clamping plate and a second clamping plate, the second clamping plate and the first clamping plate are oppositely arranged, the second clamping plate is movably connected with the first clamping plate, the second clamping plate can be driven to get close to or get away from the first clamping plate to clamp or loosen part of tabs, the supporting platform is used for supporting a pole piece body, and the first clamping plate is rotationally connected with the supporting platform through a rotating assembly; when the second clamping plate is driven to be close to the first clamping plate so as to clamp the tab, the first clamping plate can be driven to rotate relative to the supporting platform through the rotating assembly, so that a part of the B surface of the tab is turned over to one side where the A surface of the tab is located.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a tab folding mechanism and welding system for composite current collector electrodes. Background Technology

[0002] The composite current collector has an intermediate layer made of polymer material, which is not easily broken, while the two sides are made of metal layers.

[0003] When manufacturing tabs using composite current collectors, since the middle polymer layer of the composite current collector is non-conductive, conductive foil is needed, and a bonding process is required to connect the metal layers on both sides of the composite current collector. In related technologies, conductive foil is typically welded to the metal layers on both sides of the composite current collector tab; however, this welding process has several drawbacks:

[0004] (1) The foil will be subjected to two ultrasonic welding processes, which can easily cause the weld to burn through;

[0005] (2) Welding both sides A and B simultaneously will also result in a waste of conductive foil;

[0006] (3) The increase in tab thickness affects the battery pack margin;

[0007] (4) At the same time, if the conductive foil is stacked too thickly after welding, it will reduce the service life of the welding head. At the same time, if the conductive foil is stacked too thickly, it will also increase the weight of the battery and reduce the energy density of the battery.

[0008] Therefore, finding a technical solution that can solve the above-mentioned technical problems has become an important research topic for those skilled in the art. Utility Model Content

[0009] This utility model discloses a composite current collector electrode welding system to solve the technical problem that the tabs A and B of existing composite current collector electrodes need to be welded to conductive foils to achieve conductivity.

[0010] This utility model provides a tab folding mechanism for a composite current collector electrode, wherein the composite current collector electrode includes an electrode body and a tab connected to the side of the electrode body, the tab having an A surface and a B surface arranged opposite to each other, and the tab folding mechanism includes a support platform, a rotating component, a first clamping plate and a second clamping plate.

[0011] The second clamping plate is disposed opposite to the first clamping plate and is movably connected to the first clamping plate. The second clamping plate can be driven to move closer to or away from the first clamping plate to clamp or loosen part of the electrode tab. The support platform is used to support the electrode body. The first clamping plate is rotatably connected to the support platform through the rotating assembly.

[0012] When the second clamping plate is driven close to the first clamping plate to clamp the electrode tab, the first clamping plate can be driven to rotate relative to the support platform through the rotating assembly so that part of the B side of the electrode tab is folded to the side where the A side of the electrode tab is located.

[0013] Optionally, the first clamping plate is provided with a guide rod, and the second clamping plate is provided with a guide hole that cooperates with the guide rod;

[0014] The guide rod is slidably inserted into the guide hole so that the first clamping plate and the second clamping plate are slidably connected.

[0015] Optionally, the rotating assembly includes a guide frame and a guide portion;

[0016] The guide frame is installed at the bottom of the support platform. An arc-shaped slot is provided inside the guide frame. The guide part is movably inserted into the arc-shaped slot. Arc-shaped sliding grooves are provided on the opposite sides of the arc-shaped slot. Sliding columns are provided on the opposite sides of the guide part. The sliding columns are slidably connected to the arc-shaped sliding grooves.

[0017] Optionally, the rotation angle of the first clamping plate relative to the support platform ranges from 0° to 90°.

[0018] This utility model provides a welding system for composite current collector electrodes, including a composite current collector electrode unwinding mechanism, a conductive foil unwinding mechanism, a welding mechanism, a winding mechanism, and an electrode tab folding mechanism as described in any one of the claims.

[0019] The composite current collector electrode unwinding mechanism and the conductive foil unwinding mechanism are located upstream of the welding mechanism, the tab folding mechanism is located between the composite current collector electrode unwinding mechanism and the welding mechanism, and the winding mechanism is located downstream of the welding mechanism.

[0020] The tab folding mechanism is used to partially fold the tabs on the composite current collector released from the composite current collector electrode unwinding mechanism, so that part of the B side of the tab is folded to the side where the A side of the tab is located.

[0021] The welding mechanism is used to weld the conductive foil released from the conductive foil unwinding mechanism to the tab, so that the portion B on the same side of the tab is connected to the portion A through the conductive foil.

[0022] Optionally, it may also include a flattening mechanism;

[0023] The flattening mechanism is located between the welding mechanism and the tab folding mechanism. The flattening mechanism is used to flatten the tab after it has been folded by the tab folding mechanism, so that the folded part of the tab fits into the unfolded part of the tab.

[0024] Optionally, the flattening mechanism includes a first pressure roller and a second pressure roller arranged in the vertical direction, wherein the first pressure roller is connected to a lifting drive member, and the lifting drive member is used to drive the first pressure roller to press towards or away from the second pressure roller.

[0025] Optionally, it may also include a correctional agency;

[0026] The correction mechanism is located between the welding mechanism and the flattening mechanism.

[0027] Optionally, it may also include a guide roller assembly;

[0028] The guide roller group is provided between the composite current collector electrode unwinding mechanism and the electrode tab folding mechanism, the guide roller group is provided between the conductive foil unwinding mechanism and the welding mechanism, and the guide roller group is provided between the welding mechanism and the winding mechanism.

[0029] Optionally, the guide roller assembly includes at least one guide roller.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] In the tab folding mechanism of this embodiment, when the composite current collector electrode enters the tab folding mechanism, the second clamping plate is driven to approach the first clamping plate to clamp the tab. The first clamping plate can be driven to rotate relative to the support platform through the rotating assembly, so that part of the B side of the tab is folded to the side where the A side of the tab is located. Through the above design, since part of the B side and the A side of the tab are on the same side after the composite current collector electrode is folded, the conductive foil can be made to connect the B side and the A side of the tab with only one welding. This achieves the technical effects of reducing the risk of the composite current collector electrode being burned through, increasing the battery pack margin, and increasing the battery energy density. It can also save the amount of conductive foil used and reduce production costs. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1A schematic diagram of the electrode welding system for composite current collectors provided by this utility model;

[0034] Figure 2 A partially enlarged view of a welding system for composite current collector electrodes provided by this utility model;

[0035] Figure 3 A schematic diagram of the welding mechanism of a welding system for composite current collector electrodes provided by this utility model;

[0036] Figure 4 A schematic diagram of the tab of the composite current collector electrode after welding in a welding system for composite current collector electrodes provided by this utility model;

[0037] Figure 5 A schematic diagram of the tab folding mechanism for a composite current collector electrode provided by this utility model;

[0038] Figure 6 A schematic diagram of another angle of the tab folding mechanism for composite current collector electrodes provided by this utility model;

[0039] Figure 7 A schematic diagram of an arc-shaped slot structure for a tab folding mechanism for a composite current collector electrode provided by this utility model;

[0040] Figure 8 A schematic diagram of the process for a tab-folding mechanism for composite current collector electrodes provided by this utility model;

[0041] Illustration: Composite current collector electrode unwinding mechanism 1; guide roller 2; electrode tab folding mechanism 3; support platform 301; first clamping plate 302; second clamping plate 303; guide rod 304; guide frame 305; guide part 306; sliding column 307; arc-shaped sliding groove 308; arc-shaped slot 309; flattening mechanism 4; first pressure roller 401; second pressure roller 402; correction mechanism 5; welding mechanism 6; welding teeth 601; conductive foil unwinding mechanism 7; winding mechanism 8; electrode body 9; electrode tab 10; electrode tab A side 101; electrode tab B side 102; conductive foil 11; solder mark 12. Detailed Implementation

[0042] This utility model discloses an electrode tab folding mechanism and welding system for composite current collector electrodes, which solves the technical problem that the A and B sides of the electrode tabs of existing composite current collector electrodes need to be welded to conductive foils to achieve conductivity.

[0043] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please see Figures 1 to 8 This utility model provides a tab folding mechanism for a composite current collector electrode sheet, wherein the composite current collector electrode sheet includes an electrode sheet body 9 and a tab 10 connected to the side of the electrode sheet body 9, the tab 10 having an A surface and a B surface arranged opposite to each other, and the tab folding mechanism 3 includes a support platform 301, a rotating component, a first clamping plate 302 and a second clamping plate 303;

[0045] The second clamping plate 303 is disposed opposite to the first clamping plate 302, and the second clamping plate 303 is movably connected to the first clamping plate 302. The second clamping plate 303 can be driven to move closer to or away from the first clamping plate 302 to clamp or loosen part of the electrode tab 10. The support platform 301 is used to support the electrode body 9. The first clamping plate 302 is rotatably connected to the support platform 301 through the rotating assembly.

[0046] When the second clamping plate 303 is driven to approach the first clamping plate 302 to clamp the tab 10, the first clamping plate 302 can be driven to rotate relative to the support platform 301 through the rotating assembly so that part of the B side of the tab 10 is folded to the side where the A side of the tab is located.

[0047] In the tab folding mechanism of this embodiment, when the composite current collector electrode enters the tab folding mechanism 3, the second clamping plate 303 is driven to approach the first clamping plate 302 to clamp the tab 10. The first clamping plate 302 can be driven to rotate relative to the support platform 301 through the rotating assembly, so that part of the B side of the tab 10 is folded to the side where the A side of the tab 10 is located. Through the above design, since part of the B side and the A side of the tab 10 are on the same side after the composite current collector electrode is folded, the conductive foil can be made to connect the B side and the A side of the tab 10 with only one welding. This achieves the technical effects of reducing the risk of the composite current collector electrode being welded through, increasing the battery pack margin, and increasing the battery energy density. It can also save the amount of conductive foil used and reduce production costs.

[0048] Furthermore, in this embodiment, the first clamping plate 302 is provided with a guide rod 304, and the second clamping plate 303 is provided with a guide hole that cooperates with the guide rod 304;

[0049] The guide rod 304 is slidably inserted into the guide hole so that the first clamping plate 302 and the second clamping plate 303 are slidably connected.

[0050] It should be noted that the above design makes the second clamping plate 303 move more stably and smoothly when driven.

[0051] Furthermore, the rotating assembly in this embodiment includes a guide frame 305 and a guide portion 306;

[0052] The guide frame 305 is installed at the bottom of the support platform 301. An arc-shaped slot 309 is provided in the guide frame 305. The guide part 306 is movably inserted into the arc-shaped slot 309. Arc-shaped sliding grooves 308 are provided on the opposite sides of the arc-shaped slot 309. Sliding columns 307 are provided on the opposite sides of the guide part 306. The sliding columns 307 are slidably connected in the arc-shaped sliding grooves 308.

[0053] It should be noted that, through the above design, since the guide part 306 is provided with sliding columns 307 that cooperate with the arc-shaped sliding groove 308 on its opposite sides, the rotational stability of the first clamping plate 302 can be greatly improved when it rotates relative to the support platform 301.

[0054] In addition, the curvature of the aforementioned arc-shaped groove 308 can be designed according to the rotation trajectory of the first clamping plate 302, and this embodiment does not impose any restrictions on this.

[0055] Furthermore, in this embodiment, the rotation angle of the first clamping plate 302 relative to the support platform 301 ranges from 0° to 90°.

[0056] It should be noted that in this embodiment, the first clamping plate 302 can rotate within the above-mentioned angle range, thereby folding the tab 10.

[0057] Please see Figures 1 to 8 The present invention provides a welding system for composite current collector electrodes, comprising a composite current collector electrode unwinding mechanism 1, a conductive foil unwinding mechanism 7, a welding mechanism 6, a winding mechanism 8, and an electrode tab folding mechanism 3 as described above.

[0058] The composite current collector electrode unwinding mechanism 1 and the conductive foil unwinding mechanism 7 are located upstream of the welding mechanism 6, the electrode tab folding mechanism 3 is located between the composite current collector electrode unwinding mechanism 1 and the welding mechanism 6, and the winding mechanism 8 is located downstream of the welding mechanism 6.

[0059] The tab folding mechanism 3 is used to partially fold the tab 10 on the composite current collector released from the composite current collector electrode unwinding mechanism 1, so that part of the B side of the tab 10 is folded to the side where the A side of the tab is located.

[0060] The welding mechanism 6 is used to weld the conductive foil 11 released from the conductive foil unwinding mechanism 7 to the tab 10, so that the portion B side and the A side located on the same side of the tab 10 are connected through the conductive foil 11.

[0061] In the composite current collector electrode welding system of this embodiment, the composite current collector unwinding mechanism releases the composite current collector electrode. When the composite current collector electrode enters the tab folding mechanism 3, the tab folding mechanism 3 partially folds the tab on the composite current collector electrode, so that part of the B side of the tab 10 is folded to the side where the A side of the tab is located. Subsequently, the folded composite current collector electrode enters the welding mechanism 6. At the same time, the conductive foil unwinding mechanism 7 releases the conductive foil, and the conductive foil enters the welding mechanism 6. At this time, the welding mechanism 6 welds the conductive foil to the tab, so that part of the B side and the A side located on the same side of the tab 10 are connected through the conductive foil. With the above design, after the composite current collector electrode is folded, part of the B side and the A side of the tab 10 are on the same side. At this time, the conductive foil can be made to conduct the B side and the A side of the tab through only one welding, thereby reducing the risk of the composite current collector electrode being welded through, increasing the battery pack margin, and increasing the battery energy density. It can also save the amount of conductive foil used and reduce production costs.

[0062] Furthermore, the welding system in this embodiment also includes a flattening mechanism 4;

[0063] The flattening mechanism 4 is located between the welding mechanism 6 and the tab folding mechanism 3. The flattening mechanism 4 is used to flatten the tab 10 after it has been folded by the tab folding mechanism 3, so that the folded part of the tab 10 fits into the unfolded part of the tab 10.

[0064] It should be noted that, through the above design, the folded part of the tab 10 can be made to fit together with the unfolded part of the tab 10, thereby facilitating the welding mechanism to weld the conductive foil onto the tab 10 to connect the A side and the B side of the tab 10.

[0065] Specifically, the flattening mechanism 4 in this embodiment includes a first pressure roller 401 and a second pressure roller 402 arranged in the vertical direction. The first pressure roller 401 is connected to a lifting drive member, which is used to drive the first pressure roller 401 to press towards or away from the second pressure roller 402.

[0066] It should be noted that, through the above design, when the folded electrode tab 10 enters the flattening mechanism 4, the lifting drive drives the first pressure roller 401 to press against the second pressure roller 402, so that the folded part of the electrode tab 10 fits against the unfolded part of the electrode tab 10.

[0067] In addition, the aforementioned lifting drive component is specifically a pneumatic cylinder or an electric cylinder, and this embodiment does not limit it to this.

[0068] Furthermore, the welding system in this embodiment also includes a correction mechanism 5;

[0069] The correction mechanism 5 is located between the welding mechanism 6 and the flattening mechanism 4.

[0070] It should be noted that, through the above design, the correction mechanism 5 can correct the misaligned composite current collector electrode, thereby effectively preventing the electrode tab from failing to accurately enter the electrode tab folding mechanism 3 and the flattening mechanism 4.

[0071] Furthermore, the correction mechanism 5 in this embodiment is a prior art, and its specific structure should be well known to those skilled in the art. This embodiment will not describe it in detail here.

[0072] Furthermore, the welding system in this embodiment also includes a guide roller assembly;

[0073] The guide roller group is provided between the composite current collector electrode unwinding mechanism 1 and the electrode tab folding mechanism 3, the guide roller group is provided between the conductive foil unwinding mechanism 7 and the welding mechanism 6, and the guide roller group is provided between the welding mechanism 6 and the winding mechanism 8.

[0074] It should be noted that, through the above design, the guide roller assembly can fully support the composite current collector electrode, preventing the composite current collector electrode from collapsing during movement.

[0075] Specifically, the aforementioned guide roller assembly includes at least one guide roller 2.

[0076] Furthermore, the welding mechanism 6 of the welding system in this embodiment is specifically a device with a circular structure and multiple welding teeth 601 evenly distributed on the surface of the circular structure. It is also a commonly used device in the field, and this embodiment will not describe it in detail.

[0077] Furthermore, to further verify the welding effect of the above welding system, the prepared positive electrode sheet was welded using the welding system of this embodiment. The preparation process of the relevant battery positive electrode slurry, negative electrode slurry, and electrolyte is as follows:

[0078] (1) Preparation of electrolyte: Ethylene carbonate (EC), dimethyl carbonate (DMC) and diethyl carbonate (DEC) are mixed in a volume ratio of 1:2:1 to obtain a mixed organic solvent. Then, fully dried lithium salt LiPF6 is dissolved in the mixed organic solvent at a ratio of 1 mol / L to prepare an electrolyte.

[0079] (2) Battery preparation: The battery includes a positive electrode, a negative electrode, an electrolyte, and a PP separator. The positive electrode active material is a ternary material, and the positive electrode active material is graphite. The preparation methods for the positive and negative electrodes are as follows:

[0080] Positive electrode preparation: LiNi 0.6 Co 0.2 Mn 0.2 O2 (ternary material), PVDF, and SP are mixed in a mass ratio of 8:1:1 to obtain a mixed material. The mixed material is then thoroughly stirred in NMP to obtain the corresponding positive electrode active slurry. The positive electrode slurry is coated on both sides of the positive electrode current collector aluminum foil to obtain a positive electrode homogenized coating. Then, it is dried and pressed into a sheet to obtain the positive electrode sheet.

[0081] Negative electrode preparation: Graphite, binder, CMC and conductive agent are mixed in a mass ratio of 8:0.6:0.8:0.6 to obtain a mixed material. The mixed material is thoroughly stirred in deionized water to obtain the corresponding active slurry for the negative electrode. The negative electrode slurry is coated on both sides of the copper foil of the negative electrode current collector to obtain a negative electrode slurry coating. Then it is dried and pressed to obtain the negative electrode.

[0082] (3) Assemble lithium batteries: The negative electrode, PP separator (in which the second modified layer containing lithium replenishing material is adjacent to the positive electrode), and positive electrode are wound to obtain the battery cell. The battery cell is then packaged in a battery case, dried, injected with electrolyte, encapsulated, formed, and tested for capacity to obtain a lithium-ion battery.

[0083] The internal resistance and energy density data of lithium-ion batteries using the relevant welding methods are shown in the table below:

[0084]

[0085] Note: Battery internal resistance test method: The battery internal resistance can be directly obtained by testing the battery internal resistance using a battery internal resistance tester.

[0086] Energy density test method: Charge the battery at a constant current of 0.33C until the voltage reaches 4.4V, let it rest for 5 minutes, charge it at a constant voltage of 4.4V until the current value is less than or equal to 0.05C, let it rest for 5 minutes, and discharge it at 0.33C until the voltage reaches 2.8V. Obtain the energy Q. Weigh the battery and record the weight as m. Calculate the battery energy density using the formula Q / m to obtain the corresponding battery value.

[0087] The data shows that the internal resistance of the battery welded by this welding system is not much different from that of the double-layer foil welding, and the energy density is higher than that of the double-layer foil transfer welding.

[0088] The above provides a detailed description of the tab folding mechanism and welding system for composite current collector electrodes provided by this utility model. For those skilled in the art, based on the ideas of the embodiments of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A tab folding mechanism for a composite current collector pole piece, wherein, The composite current collector includes an electrode body (9) and an electrode tab (10) connected to the side of the electrode body (9). The electrode tab (10) has an A surface and a B surface arranged opposite to each other. The electrode tab folding mechanism (3) includes a support platform (301), a rotating component, a first clamping plate (302), and a second clamping plate (303). The second clamping plate (303) is disposed opposite to the first clamping plate (302), and the second clamping plate (303) is movably connected to the first clamping plate (302). The second clamping plate (303) can be driven to move closer to or away from the first clamping plate (302) to clamp or loosen part of the electrode tab (10). The support platform (301) is used to support the electrode body (9). The first clamping plate (302) is rotatably connected to the support platform (301) through the rotating assembly. When the second clamping plate (303) is driven to approach the first clamping plate (302) to clamp the tab (10), the first clamping plate (302) can be driven to rotate relative to the support platform (301) through the rotating assembly so that part of the B side of the tab (10) is folded to the side where the A side of the tab is located.

2. The tab folding mechanism for a composite current collector pole piece according to claim 1, characterized by, The first clamping plate (302) is provided with a guide rod (304), and the second clamping plate (303) is provided with a guide hole that cooperates with the guide rod (304); The guide rod (304) is slidably inserted into the guide hole so that the first clamping plate (302) and the second clamping plate (303) are slidably connected.

3. The tab folding mechanism for a composite current collector pole piece according to claim 2, characterized by, The rotating assembly includes a guide frame (305) and a guide portion (306); The guide frame (305) is installed at the bottom of the support platform (301). An arc-shaped slot (309) is provided in the guide frame (305). The guide part (306) is movably inserted into the arc-shaped slot (309). Arc-shaped sliding grooves (308) are provided on the opposite sides of the arc-shaped slot (309). Sliding columns (307) are provided on the opposite sides of the guide part (306). The sliding columns (307) are slidably connected in the arc-shaped sliding grooves (308).

4. The tab folding mechanism for a composite current collector pole piece of claim 1, wherein, The first clamping plate (302) is driven to rotate relative to the support platform (301) at an angle ranging from 0° to 90°.

5. A welding system for a composite current collector pole piece, characterized by, It includes a composite current collector electrode unwinding mechanism (1), a conductive foil unwinding mechanism (7), a welding mechanism (6), a winding mechanism (8), and an electrode tab folding mechanism (3) as described in any one of claims 1-4. The composite current collector electrode unwinding mechanism (1) and the conductive foil unwinding mechanism (7) are located upstream of the welding mechanism (6), the electrode tab folding mechanism (3) is located between the composite current collector electrode unwinding mechanism (1) and the welding mechanism (6), and the winding mechanism (8) is located downstream of the welding mechanism (6). The tab folding mechanism (3) is used to partially fold the tab (10) on the composite current collector released from the composite current collector electrode unwinding mechanism (1) so that part of the B side of the tab (10) is folded to the side where the A side of the tab is located. The welding mechanism (6) is used to weld the conductive foil (11) released from the conductive foil unwinding mechanism (7) to the tab (10) so that the portion B side and the A side located on the same side of the tab (10) are connected through the conductive foil (11).

6. The welding system for a composite current collector pole piece of claim 5, wherein, It also includes a flattening mechanism (4); The flattening mechanism (4) is located between the welding mechanism (6) and the tab folding mechanism (3). The flattening mechanism (4) is used to flatten the tab (10) after it has been folded by the tab folding mechanism (3) so that the folded part of the tab (10) fits into the unfolded part of the tab (10).

7. The welding system for a composite current collector pole piece of claim 6, wherein, The flattening mechanism (4) includes a first pressure roller (401) and a second pressure roller (402) arranged in the up-down direction. The first pressure roller (401) is connected to a lifting drive member, which is used to drive the first pressure roller (401) to press towards or away from the second pressure roller (402).

8. The welding system for a composite current collector pole piece of claim 6, wherein, It also includes corrective agencies (5); The correction mechanism (5) is located between the welding mechanism (6) and the flattening mechanism (4).

9. The welding system for a composite current collector pole piece of claim 5, wherein, It also includes guide roller sets; The guide roller group is provided between the composite current collector electrode unwinding mechanism (1) and the electrode tab folding mechanism (3), the guide roller group is provided between the conductive foil unwinding mechanism (7) and the welding mechanism (6), and the guide roller group is provided between the welding mechanism (6) and the winding mechanism (8).

10. The welding system for composite current collector electrodes according to claim 9, characterized in that, The guide roller assembly includes at least one guide roller (2).

Images