A dual tab lug battery module assembly apparatus and method

Abstract

The application discloses a double-head tab battery module assembling device and method, which comprises a conveying belt, a welding mechanism and a folding mechanism. The conveying belt is used for conveying soft package battery cells. The welding mechanism is used for welding the soft package battery cells arranged in sequence on the conveying belt to weld and fix the tabs of two adjacent soft package battery cells. The folding mechanism comprises an upper pressing machine, an upper pressing block, a sliding seat, a lower pressing machine, a lower pressing block and a horizontal pushing piece. The technical scheme has the advantages that the tabs of the soft package battery cells are welded first, the welded tabs are bent, and the soft package battery cells are finally fixed. The process has the advantages of saving the time and labor of tab perforation and tab flattening, improving the welding quality, effectively improving the rapidity and convenience of battery module assembling, reducing the cost and process difficulty, and being easy to realize automation.

Description

Technical Field

[0001] This invention relates to the field of battery module assembly technology, and in particular to a battery module assembly device and method with dual-head tabs. Background Technology

[0002] As the market demands increasingly higher battery system capacities, the capacity of individual battery cells is also growing. With the increasing size of pouch cells, the electrode arrangement has changed from single-sided to double-sided to ensure overcurrent capability. This increases the complexity of cell assembly and automated production.

[0003] Traditional dual-outlet pouch battery assembly method, such as Figure 1 As shown, whether using a bracket or an end plate, the soft-pack battery cells must first be grouped and fixed, and then the tabs must be perforated, bent, flattened, and welded in sequence (see Chinese Utility Model Patent Application No. 202020259453.7 for details). These processes generally cannot be bypassed by manual operation, and automation is difficult and costly. Summary of the Invention

[0004] In view of this, it is necessary to provide a battery module assembly device and method with dual-head tabs to solve the problem.

[0005] To achieve the above objectives, the present invention provides a dual-headed electrode tab battery module assembly device, comprising:

[0006] A conveyor belt for conveying pouch cells;

[0007] A welding mechanism is used to weld the pouch cells arranged sequentially on the conveyor belt to fix the tabs of two adjacent pouch cells.

[0008] The folding mechanism includes an upper press, an upper pressure block, a sliding seat, a lower press, a lower pressure block, and a horizontal pusher. The upper press is positioned above the discharge end of the conveyor belt and is connected to the upper pressure block, driving the upper pressure block to move up and down. The sliding seat is slidably mounted on a worktable and located below the discharge end of the conveyor belt. The fixed end of the lower press is fixed to the worktable, and the output shaft of the lower press is connected to the lower pressure block, driving the lower pressure block to move up and down. The horizontal pusher is connected to the sliding seat and driving the sliding seat to move laterally.

[0009] In some embodiments, the welding mechanism includes a welding fixture, which includes a pad, a first lifting drive, a clamping member, and a second lifting drive. The first lifting drive is connected to the pad and is used to drive the pad to move up and down so that the pad abuts against the lower end faces of two adjacent tabs. The second lifting drive is connected to the clamping member and is used to drive the clamping member to move up and down so that the clamping member abuts against the upper end faces of two adjacent tabs.

[0010] In some embodiments, the clamping member includes a horizontal plate and a vertical plate fixedly connected together. The horizontal plate has welding holes and is used to abut against the upper end surfaces of two adjacent tabs. The vertical plate is connected to the second lifting drive member.

[0011] In some embodiments, the vertical plate has mounting holes for connecting the second lifting drive component.

[0012] In some embodiments, the dual-headed tab battery module assembly device further includes an upper limit block, which is disposed above the conveyor belt and is used to abut against the upper end face of the pouch cell on the conveyor belt.

[0013] In some embodiments, there are two upper presses, which are respectively arranged on both sides of the extension direction of the conveyor belt. The upper pressure block is disposed in the extension direction of the conveyor belt, and the output shafts of the two upper presses are fixedly connected to the upper pressure block.

[0014] In some embodiments, there are two lower presses, which are respectively arranged on both sides of the extension direction of the conveyor belt. The lower pressing block is disposed in the extension direction of the conveyor belt, and the output shafts of the two lower presses are fixedly connected to the lower pressing block.

[0015] In some embodiments, the lateral pusher is a lateral pusher cylinder, which is connected to the sliding seat and is used to drive the sliding seat to move laterally.

[0016] In some embodiments, the conveyor belt is a roller conveyor belt.

[0017] The present invention also provides a method for assembling a dual-ended tab battery module, applicable to the aforementioned dual-ended tab battery module assembly device, comprising:

[0018] S1. Arrange the soft-pack battery cells side by side on the conveyor belt, so that the tabs of two adjacent soft-pack battery cells abut one after the other. Then, weld the soft-pack battery cells arranged in sequence on the conveyor belt through a welding mechanism to weld and fix the tabs of two adjacent soft-pack battery cells.

[0019] S2. The welded soft-pack battery cells are moved forward by the conveyor belt, so that the connection between the frontmost soft-pack battery cell and the second soft-pack battery cell reaches between the upper and lower pressure blocks. The upper and lower pressure blocks are offset by a preset horizontal distance, and the lower pressure block is located on the front side. The upper pressure block is driven down by the upper press to abut against the electrode tab. Then the lower pressure block is driven up by the lower press to make the frontmost soft-pack battery cell fold upward by 90°. After that, the upper and lower pressure blocks are reset.

[0020] S3. The welded soft-pack battery cell is moved forward by the conveyor belt by a first preset distance. Then, the upper pressure block is lowered by the upper press to contact the electrode tab. The lower pressure block is moved upward by the lower press so that the frontmost soft-pack battery cell continues to be folded clockwise by 90°, so that the frontmost soft-pack battery cell is stacked with the second soft-pack battery cell. After that, the upper and lower pressure blocks are reset.

[0021] S4. The welded soft-pack battery cell is moved forward by a second preset distance by the conveyor belt, so that the connection between the second and third soft-pack battery cells reaches between the upper and lower pressure blocks. The sliding seat and the lower pressure block are pushed backward by the horizontal pusher so that the lower pressure block is in front of the upper pressure block and the upper and lower pressure blocks are staggered by a preset horizontal distance. The lower pressure block is raised by the lower press to abut against the electrode tab. Then the upper pressure block is moved down by the upper press so that the two frontmost stacked soft-pack battery cells are folded down by 90°. After that, the upper and lower pressure blocks are reset.

[0022] S5. The welded soft-pack battery cell is moved forward by the conveyor belt by a first preset distance. Then, the lower press is driven by the lower press to rise to contact the electrode tab. Then, the upper press is driven by the upper press to move the upper press down so that the two soft-pack battery cells at the front end continue to be folded counterclockwise by 90°, so that the second soft-pack battery cell and the third soft-pack battery cell are stacked together. After that, the upper and lower presses are reset.

[0023] S6. Repeat steps S2-S5 until all the pouch cells are stacked together.

[0024] Compared with existing technologies, the beneficial effects of the technical solution proposed in this invention are as follows: The technical solution provided by this invention first welds the tabs of the soft-pack battery cell, then bends the welded tabs, and finally groups and fixes the soft-pack battery cells together. This process eliminates time-consuming and labor-intensive processes such as tab perforation and tab flattening, improves welding quality, effectively increases the speed and convenience of battery module assembly, reduces costs and process difficulty, and facilitates automation. It also eliminates the need for materials such as PCB boards, thereby achieving stable production quality and reducing production costs. Furthermore, when folding the soft-pack battery cell, the method of folding upwards first and then downwards facilitates the automated implementation of soft-pack battery cell folding. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the assembly method of an existing dual-headed electrode tab battery module assembly device;

[0026] Figure 2 This is a schematic diagram of the steps in an embodiment of the battery module assembly method with dual-head tabs provided by the present invention;

[0027] Figure 3 yes Figure 2 A schematic diagram of step (a) in the middle;

[0028] Figure 4 yes Figure 3 A magnified view of a portion of region A in the middle;

[0029] Figure 5 yes Figure 3 A magnified view of a portion of region B in the middle;

[0030] Figure 6 yes Figure 2 A schematic diagram of step (b) in the middle;

[0031] Figure 7 yes Figure 2 A schematic diagram of step (c) in the middle section;

[0032] Figure 8 yes Figure 2 A schematic diagram of step (d) in the middle section;

[0033] Figure 9 yes Figure 2 A schematic diagram of step (e) in the middle section;

[0034] Figure 10 yes Figure 2 A schematic diagram of step (f) in the middle;

[0035] Figure 11 yes Figure 2 A simplified diagram of the assembly process of pouch cells in China;

[0036] Figure 12 yes Figure 3 A three-dimensional structural diagram of the welding fixture;

[0037] In the diagram: 1-Conveyor belt, 2-Welding mechanism, 21-Welding fixture, 211-Pad plate, 212-First lifting drive component, 213-Clamping component, 2131-Horizontal plate, 21311-Welding hole, 2132-Vertical plate, 21321-Mounting hole, 214-Second lifting drive component, 3-Folding mechanism, 31-Upper press, 32-Upper pressure block, 33-Sliding seat, 34-Lower press, 35-Lower pressure block, 36-Horizontal push component, 4-Soft-pack battery cell, 41-Electrical tab, 5-Workbench, 6-Upper limit block. Detailed Implementation

[0038] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0039] Please refer to Figures 2-11 The present invention provides a battery module assembly device with dual-head tabs, including a conveyor belt 1, a welding mechanism 2 and a folding mechanism 3.

[0040] The conveyor belt 1 is used to transport the pouch cells 4.

[0041] The welding mechanism 2 is used to weld the pouch cells 4 arranged sequentially on the conveyor belt 1 to weld and fix the tabs 41 of two adjacent pouch cells 4.

[0042] The folding mechanism 3 includes an upper press 31, an upper pressing block 32, a sliding seat 33, a lower press 34, a lower pressing block 35, and a horizontal pusher 36. The upper press 31 is located above the discharge end of the conveyor belt 1. The upper press 31 is connected to the upper pressing block 32 and is used to drive the upper pressing block 32 to move up and down. The sliding seat 33 is slidably disposed on the worktable 5 and located below the discharge end of the conveyor belt 1. The fixed end of the lower press 34 is fixed to the worktable 5. The output shaft of the lower press 34 is connected to the lower pressing block 35 and is used to drive the lower pressing block 35 to move up and down. The horizontal pusher 36 is connected to the sliding seat 33 and is used to drive the sliding seat 33 to move laterally.

[0043] In use, the pouch cells 4 are arranged side by side on the conveyor belt 1, so that the tabs 41 of two adjacent pouch cells 4 abut one end to the other. Then, the welding mechanism 2 welds the pouch cells 4 arranged sequentially on the conveyor belt 1 to fix the tabs 41 of two adjacent pouch cells 4 in place. Figure 2 a) The welded soft-pack battery cell 4 is then moved forward by the conveyor belt, so that the connection between the foremost soft-pack battery cell 4 and the second soft-pack battery cell 4 reaches between the upper pressure block 32 and the lower pressure block 35. The upper pressure block 32 and the lower pressure block 35 are offset by a preset horizontal distance (0.3-0.5cm in this embodiment), and the lower pressure block 35 is located on the front side (with the conveying direction of the conveyor belt 1 as the front side). The upper pressure machine 31 drives the upper pressure block 32 to descend until it abuts against the electrode tab 41, and then the lower pressure machine 34 drives the lower pressure block 35 to move upward, so that the foremost soft-pack battery cell 4 is folded upward by 90° (e.g., Figure 2b) Afterwards, the upper pressure block 32 and the lower pressure block 35 are reset; then, the welded soft-pack battery cell 4 is moved forward by the conveyor belt 1 by a first preset distance (1-2 cm in this embodiment), and then the upper pressure block 32 is lowered by the upper pressure machine 31 to abut against the electrode tab 41, and the lower pressure block 35 is moved upward by the lower pressure machine 34, so that the frontmost soft-pack battery cell 4 continues to be folded clockwise by 90°, so that the frontmost soft-pack battery cell 4 is superimposed on the second soft-pack battery cell 4 (e.g. Figure 2 c) Afterwards, the upper pressure block 32 and the lower pressure block 35 are reset; then, the welded soft-pack battery cell 4 is moved forward by the conveyor belt 1 by a second preset distance (approximately one distance in this embodiment), so that the connection point between the second soft-pack battery cell 4 and the third soft-pack battery cell 4 reaches between the upper pressure block 32 and the lower pressure block 35 (e.g., Figure 2 d) The sliding seat 33 and the lower pressure block 35 are pushed backward by the horizontal pusher 36 so that the lower pressure block 35 is located in front of the upper pressure block 32, and the upper pressure block 32 and the lower pressure block 35 are offset by a preset horizontal distance. The lower pressure block 35 is driven to rise by the lower pressure machine 34 until it abuts against the electrode tab 41. Then the upper pressure machine 31 drives the upper pressure block 32 to move downward so that the two frontmost stacked soft-pack cells 4 are folded downward by 90° (e.g., Figure 2 e) Afterwards, the upper pressure block 32 and the lower pressure block 35 are reset; then, the conveyor belt 1 drives the welded soft-pack battery cell 4 forward by a first preset distance, and then the lower pressure machine 34 drives the lower pressure block 35 to rise to abut against the tab 41, and then the upper pressure machine 31 drives the upper pressure block 32 to move downward, so that the two frontmost stacked soft-pack battery cells 4 continue to be folded counterclockwise by 90°, so that the second soft-pack battery cell 4 and the third soft-pack battery cell 4 are stacked together (e) Figure 2 f), then the upper pressure block 32 and the lower pressure block 35 are reset; repeat the above steps until all the soft-pack cells 4 are stacked together.

[0044] The technical solution provided by this invention first laser-welds the tabs 41 of the pouch cell 4, then bends the welded tabs 41, and finally assembles and fixes the pouch cells 4 into groups. The advantages of this process are that it eliminates time-consuming and labor-intensive processes such as tab perforation and tab flattening, improves welding quality, effectively increases the speed and convenience of battery module assembly, reduces costs and process difficulty, and facilitates automation. It also eliminates the need for materials such as PCB boards, thereby achieving stable production quality and reducing production costs. Furthermore, when folding the pouch cell 4, the method of folding upwards first and then downwards facilitates the automation of pouch cell folding.

[0045] To improve welding results, please refer to... Figure 3 , Figure 5 and Figure 12In a preferred embodiment, the welding mechanism 2 includes a welding fixture 21, which includes a pad 211, a first lifting drive 212, a clamping member 213, and a second lifting drive 214. The first lifting drive 212 is connected to the pad 211 and is used to drive the pad 211 to move up and down so that the pad 211 abuts against the lower end faces of two adjacent tabs 41. The second lifting drive 214 is connected to the clamping member 213 and is used to drive the clamping member 213 to move up and down so that the clamping member 213 abuts against the upper end faces of two adjacent tabs 41. The pad 211 and the clamping member 213 clamp the two tabs 41, thereby facilitating welding and improving welding quality. The function of the first lifting drive 212 and the second lifting drive 214 is to drive the pad 211 and the clamping member 213 to move to avoid obstruction, thereby preventing the pad 211 and the clamping member 213 from blocking the movement of the soft-pack battery cell 4.

[0046] To understand the specific function of clamping component 213, please refer to... Figure 3 , Figure 5 and Figure 12 In a preferred embodiment, the clamping member 213 includes a horizontal plate 2131 and a vertical plate 2132 fixedly connected. The horizontal plate 2131 has a welding hole 21311 and is used to abut against the upper end face of the two adjacent tabs 41. The vertical plate 2132 is connected to the second lifting drive member 214.

[0047] To facilitate the connection between the vertical plate 2132 and the second lifting drive component 214, please refer to... Figure 5 and Figure 12 In a preferred embodiment, the vertical plate 2132 is provided with a mounting hole 21321 for connecting the second lifting drive component 214. In this embodiment, the second lifting drive component 214 is a second lifting drive cylinder, and the output shaft of the second lifting drive cylinder is fixedly connected to the vertical plate 2132.

[0048] To prevent the soft-pack battery cell 4 from falling out, please refer to... Figure 3 and Figure 6 In a preferred embodiment, the dual-headed electrode tab battery module assembly device further includes an upper limit block 6, which is disposed above the conveyor belt 1 and abuts against the upper end face of the pouch cell 4 on the conveyor belt 1. This limits the pouch cell 4, preventing it from falling off at the front end.

[0049] To prevent the upper press machine 31 from obstructing the upward folding of the soft-pack battery cell 4, please refer to... Figure 2 and Figure 3In a preferred embodiment, there are two upper presses 31, which are respectively arranged on both sides of the extension direction of the conveyor belt 1. The upper pressure block 32 is arranged in the extension direction of the conveyor belt 1. The output shafts of the two upper presses 31 are fixedly connected to the upper pressure block 32. Since the two upper presses 31 are respectively arranged on both sides of the extension direction of the conveyor belt 1, the soft-pack battery cell 4 will not be blocked by the upper presses 31 no matter how it is folded.

[0050] To prevent the lower press machine 34 from obstructing the downward folding of the soft-pack battery cell 4, please refer to... Figure 2 and Figure 3 In a preferred embodiment, there are two lower presses 34, which are respectively arranged on both sides of the extension direction of the conveyor belt 1. The lower pressing block 35 is disposed in the extension direction of the conveyor belt 1, and the output shafts of the two lower presses 34 are fixedly connected to the lower pressing block 35.

[0051] To understand the specific function of the transverse pusher 36, please refer to... Figure 3 and Figure 4 In a preferred embodiment, the lateral pusher 36 is a lateral pusher cylinder. The lateral pusher cylinder is connected to the sliding seat 33 and is used to drive the sliding seat 33 to move laterally, thereby adjusting the lateral position of the lower pressure block 35 to meet the requirements of the lateral position of the lower pressure block 35 when folding upwards and downwards.

[0052] To improve compressive strength, please refer to... Figure 3 In a preferred embodiment, the conveyor belt 1 is a roller conveyor belt.

[0053] The present invention also provides a method for assembling a dual-ended tab battery module, applicable to the aforementioned dual-ended tab battery module assembly device, comprising:

[0054] S1. The pouch cells 4 are arranged side by side on the conveyor belt 1, so that the tabs 41 of two adjacent pouch cells 4 abut one after the other. Then, the pouch cells 4 arranged in sequence on the conveyor belt 1 are welded by the welding mechanism 2 to fix the tabs 41 of two adjacent pouch cells 4 (e.g., ...). Figure 2 a);

[0055] S2. The welded soft-pack battery cell 4 is moved forward by the conveyor belt, so that the connection between the foremost soft-pack battery cell 4 and the second soft-pack battery cell 4 reaches between the upper pressure block 32 and the lower pressure block 35. The upper pressure block 32 and the lower pressure block 35 are offset by a preset horizontal distance (0.3-0.5cm in this embodiment), and the lower pressure block 35 is located on the front side (with the conveying direction of the conveyor belt 1 as the front side). The upper pressure machine 31 drives the upper pressure block 32 to descend until it abuts against the electrode tab 41, and then the lower pressure machine 34 drives the lower pressure block 35 to move upward, so that the foremost soft-pack battery cell 4 is folded upward by 90° (e.g., Figure 2 b) After that, the upper pressure block 32 and the lower pressure block 35 are reset;

[0056] S3. The welded soft-pack battery cell 4 is moved forward by the conveyor belt 1 by a first preset distance (1-2 cm in this embodiment). Then, the upper pressure block 32 is lowered by the upper pressure machine 31 until it abuts against the tab 41, and the lower pressure block 35 is moved upward by the lower pressure machine 34, so that the frontmost soft-pack battery cell 4 continues to fold clockwise by 90°, thereby making the frontmost soft-pack battery cell 4 overlap with the second soft-pack battery cell 4 (e.g., Figure 2 c) After that, the upper pressure block 32 and the lower pressure block 35 are reset;

[0057] S4. The welded soft-pack battery cell 4 is moved forward by the conveyor belt 1 by a second preset distance (approximately one distance in this embodiment), so that the connection point between the second soft-pack battery cell 4 and the third soft-pack battery cell 4 reaches between the upper pressure block 32 and the lower pressure block 35 (e.g., Figure 2 d) The sliding seat 33 and the lower pressure block 35 are pushed backward by the horizontal pusher 36 so that the lower pressure block 35 is located in front of the upper pressure block 32, and the upper pressure block 32 and the lower pressure block 35 are offset by a preset horizontal distance. The lower pressure block 35 is driven to rise by the lower pressure machine 34 until it abuts against the electrode tab 41. Then the upper pressure machine 31 drives the upper pressure block 32 to move downward so that the two frontmost stacked soft-pack cells 4 are folded downward by 90° (e.g., Figure 2 e) After that, the upper pressure block 32 and the lower pressure block 35 are reset;

[0058] S5. The welded soft-pack battery cell 4 is moved forward a first preset distance by the conveyor belt 1, and then the lower pressure block 35 is raised by the lower pressure machine 34 to abut against the electrode tab 41. Then the upper pressure block 32 is moved down by the upper pressure machine 31, so that the two frontmost stacked soft-pack battery cells 4 continue to be folded counterclockwise by 90°, so that the second soft-pack battery cell 4 is stacked together with the third soft-pack battery cell 4 (e.g., Figure 2 f), after which the upper pressure block 32 and the lower pressure block 35 are reset;

[0059] S6. Repeat the above steps until all the pouch cells 4 are stacked together.

[0060] The technical solution provided by this invention first laser-welds the tabs 41 of the pouch cell 4, then bends the welded tabs 41, and finally assembles and fixes the pouch cells 4 into groups. The advantages of this process are that it eliminates time-consuming and labor-intensive processes such as tab perforation and tab flattening, improves welding quality, effectively increases the speed and convenience of battery module assembly, reduces costs and process difficulty, and facilitates automation. It also eliminates the need for materials such as PCB boards, thereby achieving stable production quality and reducing production costs. Furthermore, when folding the pouch cell 4, the method of folding upwards first and then downwards facilitates the automation of pouch cell folding.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery module assembly device with dual-head output tabs, characterized in that, include: A conveyor belt for conveying pouch cells; A welding mechanism is used to weld the pouch cells arranged sequentially on the conveyor belt to fix the tabs of two adjacent pouch cells. The folding mechanism includes an upper press, an upper pressing block, a sliding seat, a lower press, a lower pressing block, and a horizontal pusher. The upper press is positioned above the discharge end of the conveyor belt and is connected to the upper pressing block, driving the upper pressing block to move up and down. The sliding seat is slidably mounted on a worktable and located below the discharge end of the conveyor belt. The fixed end of the lower press is fixed to the worktable, and the output shaft of the lower press is connected to the lower pressing block, driving the lower pressing block to move up and down. The horizontal pusher is connected to the sliding seat and drives the sliding seat to move laterally, thereby adjusting the lateral position of the lower pressing block to meet the requirements for the lateral position of the lower pressing block when folding upwards and downwards.

2. The battery module assembly device with dual-head output tabs according to claim 1, characterized in that, The welding mechanism includes a welding fixture, which includes a pad, a first lifting drive, a clamping member, and a second lifting drive. The first lifting drive is connected to the pad and is used to drive the pad to move up and down so that the pad abuts against the lower end faces of two adjacent tabs. The second lifting drive is connected to the clamping member and is used to drive the clamping member to move up and down so that the clamping member abuts against the upper end faces of two adjacent tabs.

3. The dual-headed electrode tab battery module assembly device according to claim 2, characterized in that, The clamping component includes a horizontal plate and a vertical plate that are fixedly connected. The horizontal plate has welding holes and is used to abut against the upper end surfaces of the two adjacent pole ears. The vertical plate is connected to the second lifting drive component.

4. The battery module assembly device with dual-head output tabs according to claim 3, characterized in that, The vertical plate has mounting holes for connecting the second lifting drive component.

5. The battery module assembly device with dual-head output tabs according to claim 1, characterized in that, It also includes an upper limit block, which is disposed above the conveyor belt and is used to abut against the upper end face of the soft-pack battery cell on the conveyor belt.

6. The battery module assembly device with dual-head output tabs according to claim 1, characterized in that, The number of upper presses is two, and the two upper presses are respectively arranged on both sides of the extension direction of the conveyor belt. The upper pressure block is set in the extension direction of the conveyor belt, and the output shafts of the two upper presses are fixedly connected to the upper pressure block.

7. The battery module assembly device with dual-head output tabs according to claim 1, characterized in that, The number of the lower press is two, and the two lower presses are respectively arranged on both sides of the extension direction of the conveyor belt. The lower pressing block is set in the extension direction of the conveyor belt, and the output shafts of the two lower presses are fixedly connected to the lower pressing block.

8. The battery module assembly device with dual-head output tabs according to claim 1, characterized in that, The lateral pusher is a lateral pusher cylinder, which is connected to the sliding seat and is used to drive the sliding seat to move laterally.

9. The battery module assembly device with dual-head output tabs according to claim 1, characterized in that, The conveyor belt is a roller conveyor belt.

10. A method for assembling a battery module with dual-head tabs, applicable to the battery module assembly apparatus with dual-head tabs as described in any one of claims 1-9, characterized in that, include: S1. Arrange the soft-pack battery cells side by side on the conveyor belt, so that the tabs of two adjacent soft-pack battery cells abut one after the other. Then, weld the soft-pack battery cells arranged in sequence on the conveyor belt through a welding mechanism to weld and fix the tabs of two adjacent soft-pack battery cells. S2. The welded soft-pack battery cells are moved forward by the conveyor belt, so that the connection between the frontmost soft-pack battery cell and the second soft-pack battery cell reaches between the upper and lower pressure blocks. The upper and lower pressure blocks are offset by a preset horizontal distance, and the lower pressure block is located on the front side. The upper pressure block is driven down by the upper press to abut against the electrode tab. Then the lower pressure block is driven up by the lower press to make the frontmost soft-pack battery cell fold upward by 90°. After that, the upper and lower pressure blocks are reset. S3. The welded soft-pack battery cell is moved forward by the conveyor belt by a first preset distance. Then, the upper pressure block is lowered by the upper press to contact the electrode tab. The lower pressure block is moved upward by the lower press so that the frontmost soft-pack battery cell continues to be folded clockwise by 90°, so that the frontmost soft-pack battery cell is stacked with the second soft-pack battery cell. After that, the upper and lower pressure blocks are reset. S4. The welded soft-pack battery cell is moved forward by a second preset distance by the conveyor belt, so that the connection between the second and third soft-pack battery cells reaches between the upper and lower pressure blocks. The sliding seat and the lower pressure block are pushed backward by the horizontal pusher so that the lower pressure block is in front of the upper pressure block and the upper and lower pressure blocks are staggered by a preset horizontal distance. The lower pressure block is raised by the lower press to abut against the electrode tab. Then the upper pressure block is moved down by the upper press so that the two frontmost stacked soft-pack battery cells are folded down by 90°. After that, the upper and lower pressure blocks are reset. S5. The welded soft-pack battery cell is moved forward by the conveyor belt by a first preset distance. Then, the lower press is driven by the lower press to rise to contact the electrode tab. Then, the upper press is driven by the upper press to move the upper press down so that the two soft-pack battery cells at the front end continue to be folded counterclockwise by 90°, so that the second soft-pack battery cell and the third soft-pack battery cell are stacked together. After that, the upper and lower presses are reset. S6. Repeat steps S2-S5 until all the pouch cells are stacked together.

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