Tab welding device for soft package battery cell

Abstract

The invention discloses a tab welding device for a soft package battery cell, and belongs to the technical field of soft package battery cell processing, the tab welding device comprises a base, a soft package battery cell body is arranged above the base, and the top of the base is connected with a supporting assembly for supporting the bottom of the soft package battery cell body; according to the invention, each bearing plate is provided with two side rib plates capable of moving oppositely, through the transverse unfolding movement of the side rib plates, the top of a tab can be comprehensively supported from the inner side, and the structure can flexibly adapt to the welding requirements of tabs of different models, so that the welding efficiency is improved, and the welding quality is improved. Meanwhile, the movement of the side rib plates can also exert a correction effect on the soft package battery cell monomer, and the bottom of the battery cell is supported by a plurality of rolling sleeves adopting a switching design, so that the position adjustment of the monomer is smoother, the deformation of the tab due to stress is effectively avoided, and a reliable guarantee is provided for the subsequent welding quality.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soft package battery cell processing, and particularly relates to a tab welding device for a soft package battery cell. BACKGROUND

[0002] The soft package battery cell is a lithium ion battery with an aluminum plastic film as a packaging material. Tab welding of the soft package battery cell is a key process in battery manufacturing, directly affecting the performance and safety of the battery. The core points thereof include welding methods, process requirements, material selection and innovative technologies. The battery module of the soft package battery cell is formed by connecting a plurality of single cells in series and parallel through conductive connecting pieces. The single cell is provided with tabs for conducting electricity.

[0003] Some invention patents in the technical field of soft package battery cell processing are disclosed in the prior art. The invention patent with the publication number CN221715980U discloses a tab welding device for a soft package battery cell module, which comprises a base, a support piece, and a comb plate in sliding connection with the base. The sliding direction is X direction. The comb plate comprises a body and a plurality of comb teeth extending from the body in X direction. The comb teeth are sequentially and spacedly distributed in Y direction. A gap for the tab to pass through is formed between adjacent two comb teeth. The support piece is provided with a plurality of grooves corresponding to the comb teeth. Each groove is located on the moving path of the corresponding comb tooth, and each groove has a support surface supporting the corresponding comb tooth. The welding quality of the tab can be improved. However, the technical solution still has some deficiencies in the process of use. During the sealing and welding process of the tab of the soft package battery, due to the deviation of the position of the cell, the position of the tab is inaccurate, resulting in a large proportion of unqualified products in the sealing and welding process.

[0004] Therefore, the tab welding device for the soft package battery cell is designed to solve the above problems. SUMMARY

[0005] The purpose of the present application is to solve the problem that the tab of the soft package battery is inaccurate during the sealing and welding process due to the deviation of the position of the cell, resulting in a large proportion of unqualified products in the sealing and welding process. A tab welding device for a soft package battery cell is provided.

[0006] In order to achieve the above purpose, the application adopts the following technical scheme: A tab welding device for a soft package battery cell, comprising a base, a soft package battery cell body arranged above the base, a support assembly connected to the top of the base for supporting the bottom of the soft package battery cell body, a positive electrode clamp and a negative electrode clamp respectively connected to the top of the base on both sides of the soft package battery cell body, the positive electrode clamp and the negative electrode clamp being the same structure. The same bearing assembly is inserted into the plurality of tab groups of the soft package battery core body.

[0007] As a further description of the above technical solution: The positive electrode clamp comprises a plurality of first sliding rails connected to the top of the base, a first rail seat is slidingly connected to each of the first sliding rails, and a same truss is connected to the plurality of first rail seats.

[0008] As a further description of the above technical solution: The support assembly comprises a support plate connected to the top of the base, a rolling groove is formed in the top of the support plate, a plurality of rolling shafts are linearly and equidistantly arranged and rotatably connected to the inner wall of the rolling groove, a rolling sleeve is rotatably connected to each of the plurality of rolling shafts, the soft package battery core body is composed of a plurality of soft package battery cores stacked together, and the top of each of the plurality of rolling sleeves is connected to the bottom of each of the plurality of soft package battery cores.

[0009] As a further description of the above technical solution: The pushing assembly comprises a side seat connected to the front end face of the base, two second sliding rails are connected to the top of the side seat, a second rail seat is slidingly connected to each of the two second sliding rails, a bridging shaft is connected between the two second rail seats, a fourth hydraulic cylinder is installed on the top of the side seat, and the telescopic end of the fourth hydraulic cylinder is connected to the bridging shaft. A fifth hydraulic cylinder is installed on the top of each of the two second rail seats, and the telescopic ends of the two fifth hydraulic cylinders are connected to inverted U-shaped frames.

[0010] As a further description of the above technical solution: The bearing assembly comprises a horizontal support connected to the inner side of the U-shaped frame, a sliding groove is formed in the side end face of the horizontal support, a fixing block is clamped to the inner side wall of the sliding groove, a plurality of sliding blocks are slidingly connected to the inner side wall of the sliding groove on both sides of the fixing block, and the side of each of the plurality of sliding blocks and the fixing block facing the soft package battery core body is connected to a bearing.

[0011] As a further description of the above technical solution: The bearing comprises a bearing plate, one end of the bearing plate is connected to the fixing block or the sliding block, the other side of the bearing plate is inserted into a group of longitudinally arranged tabs, a plurality of compensation grooves are formed in the side end face of the bearing plate corresponding to the positions of the tabs, a side rib plate is connected to the side end face of the bearing plate corresponding to each of the plurality of compensation grooves, a plurality of compensation ribs are connected to the side end face of the side rib plate, the side rib plate is slidingly connected to the compensation groove through the compensation ribs, and the plurality of compensation ribs on the two side rib plates are arranged in a staggered manner.

[0012] As a further description of the above technical solution: The side end face of the side rib plate is connected to a directional shaft, and the side end face of the bearing plate is provided with a directional groove corresponding to the directional shaft. The directional shaft is inserted into the directional groove, and the other end of the directional shaft is connected to a support spring. The directional shaft is elastically supported and connected to the bottom of the directional groove through the support spring.

[0013] As a further description of the above technical solution: A width adjustment assembly is provided between multiple carrier components. The width adjustment assembly includes a connecting sleeve that is sleeved on multiple carrier plates. The rear end face of the connecting sleeve is connected to multiple trapezoidal seats. Wedge seats are slidably connected to the two inclined surfaces of the trapezoidal seats. The bottom of the two wedge seats is respectively connected to the top of the two side ribs. The top of the support plate is rotatably connected to a first pin, and a first hinge rod and a second hinge rod are rotatably connected to the first pin respectively. The second hinge rod and the first hinge rod are arranged crosswise. The ends of the first hinge rod and the second hinge rod are hinged to an adjacent set of first hinge rods and second hinge rods through two second pins. A third hydraulic cylinder is installed in the slide groove, and the telescopic end of the third hydraulic cylinder is connected to one of the sliding blocks.

[0014] As a further description of the above technical solution: The top of the connecting sleeve is connected to a first adapter frame, and the inner side of the first adapter frame is rotatably connected to a first adapter joint. The top of the horizontal support is connected to a second adapter frame, and the inner side of the second adapter frame is rotatably connected to a second adapter joint. A second hydraulic cylinder is installed between the first adapter joint and the second adapter joint.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, each support plate is equipped with two side ribs that can move in opposite directions. Through their lateral expansion movement, they can provide full support for the top of the electrode from the inside. This structure can flexibly adapt to the welding requirements of different types of electrode tabs, and has strong practicality and adjustment flexibility. At the same time, the movement of the side ribs can also apply a correction effect to the soft-pack battery cell. The bottom of the battery cell is supported by multiple rolling sleeves with an adapter design, which makes the adjustment of the cell position smoother and effectively avoids the electrode tab from deforming due to force, thereby providing a reliable guarantee for the subsequent welding quality.

[0016] 2. In this invention, the hinge rods of adjacent bearing plates are hinged to each other through the second pin to realize the equal spacing adjustment of the bearing plates. The system has the functions of adjustable support surface size, adjustable support height and adjustable spacing between plates, and can be adapted to the welding processing requirements of various models of soft-pack battery cells. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a tab welding device for pouch cells proposed in this invention. Figure 2 This is a schematic diagram of the electrode tab welding device for soft-pack battery cells from another perspective, as proposed in this invention. Figure 3 This is a structural schematic diagram of a tab welding device for pouch cells proposed in this invention, after being disassembled. Figure 4 This invention proposes a tab welding device for pouch cells. Figure 3 Enlarged structural diagram of the central support component; Figure 5 This is a schematic diagram of the supporting component in a tab welding device for pouch cells proposed in this invention; Figure 6 This is a schematic diagram of the structure of the support component disassembled in the tab welding device for pouch cells proposed in this invention; Figure 7 This invention proposes a tab welding device for pouch cells. Figure 6 Enlarged structural diagram at point A; Figure 8 This invention proposes a tab welding device for pouch cells. Figure 6 Enlarged structural diagram at point B; Figure 9 This is a schematic diagram of the width adjustment component in a tab welding device for pouch cells proposed in this invention, viewed from another angle.

[0018] Legend: 1. Base; 2. Positive electrode clamp; 201. First slide rail; 202. First track seat; 203. Truss; 204. Chuck; 205. First hydraulic cylinder; 3. Negative electrode clamp; 4. Support assembly; 401. Support plate; 402. Roller groove; 403. Roller shaft; 404. Roller sleeve; 5. Soft-pack battery cell body; 6. Bearing assembly; 601. Horizontal bracket; 602. Slide groove; 603. Fixing block; 604. Sliding block; 605. Bearing component; 6051. Bearing plate; 6052. Compensation groove; 6053. Side rib plate; 6054. Compensation rib; 6055. Orientation groove; 6056. Orientation shaft; 6057. Support 7. Support spring; 7. Width adjustment assembly; 701. Connecting sleeve; 702. Trapezoidal seat; 703. Wedge seat; 704. First pin; 705. First hinge rod; 706. Second hinge rod; 707. Second pin; 708. Adjusting component; 7081. First adapter frame; 7082. First adapter joint; 7083. Second hydraulic cylinder; 7084. Second adapter joint; 7085. Second adapter frame; 709. Third hydraulic cylinder; 8. Pushing assembly; 801. Side seat; 802. Second slide rail; 803. Second track seat; 804. Bridge shaft; 805. Fourth hydraulic cylinder; 806. Fifth hydraulic cylinder; 807. U-shaped frame. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0020] Please see the appendix Figure 1 -Appendix Figure 9 The present invention provides a technical solution: a tab welding device for soft-pack battery cells, including a base 1, a soft-pack battery cell body 5 is disposed above the base 1, a support component 4 for supporting the bottom of the soft-pack battery cell body 5 is connected to the top of the base 1, and a positive electrode clamp 2 and a negative electrode clamp 3 are respectively connected to the top of the base 1 on both sides of the soft-pack battery cell body 5, the positive electrode clamp 2 and the negative electrode clamp 3 have the same structure. The multiple sets of tabs of the soft-pack battery cell body 5 are inserted into the same carrier component 6, and the front end face of the base 1 is connected to a push component 8 for pushing the carrier component 6 into the inside of the multiple sets of tabs.

[0021] Specifically, the positive electrode clamp 2 includes multiple first slide rails 201 connected to the top of the base 1, each of the multiple first slide rails 201 is slidably connected to a first track seat 202, the multiple first track seats 202 are connected to the same truss 203, the inner side of the truss 203 is connected to a clamp 204, and a first hydraulic cylinder 205 is installed on the top of the base 1, the telescopic end of the first hydraulic cylinder 205 is connected to the truss 203.

[0022] The specific implementation method is as follows: The soft-pack battery cell body 5 is placed on top of multiple rolling sleeves 404. Then, the positive electrode clamp 2 and the negative electrode clamp 3 are simultaneously controlled to extend the first hydraulic cylinder 205. The first hydraulic cylinder 205 applies a thrust to the truss 203. The truss 203 slides on multiple first slide rails 201 through multiple first track seats 202. The clamps 204 located on both sides of the soft-pack battery cell body 5 slowly approach the soft-pack battery cell body 5. The soft-pack battery cell body 5 moves to the longitudinal center position of the support assembly 4 under the push of the two clamps 204. At this time, the multiple sets of electrode tabs of the soft-pack battery cell body 5 correspond to multiple side ribs 6053. After the longitudinal positioning of the soft-pack battery cell body 5 is completed, the two first hydraulic cylinders 205 are controlled to retract.

[0023] Specifically, the support assembly 4 includes a support plate 401 connected to the top of the base 1. The top of the support plate 401 is provided with a roller groove 402. The inner wall of the roller groove 402 is rotatably connected to a plurality of roller shafts 403 arranged linearly and equally. Roller sleeves 404 are rotatably connected to each of the roller shafts 403. The soft-pack battery cell body 5 is composed of multiple soft-pack battery cells stacked together. The top of the multiple roller sleeves 404 is respectively connected to the bottom of the multiple soft-pack battery cells. The push assembly 8 includes a side seat 801 connected to the front end face of the base 1. The top of the side seat 801 is connected to two second slide rails 802. The two second slide rails 802 are slidably connected to a second track seat 803. A bridging shaft 804 is connected between the two second track seats 803. A fourth hydraulic cylinder 805 is installed on the top of the side seat 801. The telescopic end of the fourth hydraulic cylinder 805 is connected to the bridging shaft 804. Each of the two second track seats 803 has a fifth hydraulic cylinder 806 mounted on its top. The telescopic ends of the two fifth hydraulic cylinders 806 are connected to an inverted U-shaped frame 807. The bearing assembly 6 includes a horizontal support 601 connected to the inner side of the U-shaped frame 807. A sliding groove 602 is provided on the side end face of the horizontal support 601. A fixing block 603 is engaged with the inner side wall of the sliding groove 602. Multiple sliding blocks 604 are slidably connected to both sides of the fixing block 603 on the inner side wall of the sliding groove 602. The multiple sliding blocks 604 and the fixing block 603 are connected together. 3. Each side of the soft-pack battery cell body 5 is connected to a carrier member 605. The carrier member 605 includes a carrier plate 6051. One end of the carrier plate 6051 is connected to a fixing block 603 or a sliding block 604. The other side of the carrier plate 6051 is inserted into a set of longitudinally placed tabs. Multiple compensation slots 6052 are opened on the side end face of the carrier plate 6051 corresponding to the position of the tabs. Side ribs 6053 are connected to both side end faces of the carrier plate 6051 corresponding to the multiple compensation slots 6052. The side end face of the side ribs 6053 is connected to... Multiple compensating ribs 6054 are attached to the side ribs 6053, which are slidably connected to the compensating grooves 6052 via the compensating ribs 6054. The multiple compensating ribs 6054 on the two side ribs 6053 are arranged in an alternating pattern. A directional shaft 6056 is connected to the side end face of the side rib 6053. A directional groove 6055 is opened on the side end face of the bearing plate 6051 corresponding to the directional shaft 6056. The directional shaft 6056 is inserted into the directional groove 6055. A support spring 6 is connected to the other end of the directional shaft 6056. 057, the directional shaft 6056 is elastically supported and connected to the bottom of the directional groove 6055 through the support spring 6057. A width adjustment assembly 7 is provided between multiple bearing members 605. The width adjustment assembly 7 includes a connecting sleeve 701 sleeved on multiple bearing plates 6051. Multiple trapezoidal seats 702 are connected to the rear end face of the connecting sleeve 701. Wedge seats 703 are slidably connected to the two inclined surfaces of the trapezoidal seats 702. The bottom of the two wedge seats 703 are respectively connected to the top of the two side ribs 6053. A first pin 704 is rotatably connected to the top of the support plate 6051. A first hinge rod 705 and a second hinge rod 706 are rotatably connected to the first pin 704. The second hinge rod 706 and the first hinge rod 705 are arranged crosswise. The ends of the first hinge rod 705 and the second hinge rod 706 are hinged to an adjacent pair of first hinge rods 705 and 706 through two second pins 707. A third hydraulic cylinder 709 is installed in the slide groove 602. The telescopic end of the third hydraulic cylinder 709 is connected to one of the sliding blocks 604. Controlling the telescopic movement of the third hydraulic cylinder 709 generates a pushing or pulling force on the sliding block 604 connected to its telescopic end. Under the action of the pushing or pulling force, the sliding block 604 slides in the slide groove 602. Since the support plate 6051 is rotatably connected to the first hinge rods 704 through the first pins 704, the first hinge rods 705 and the second hinge rod 706 are rotatably connected crosswise. The first hinge rod 705 and the second hinge rod 706 on two adjacent bearing plates 6051 are connected to each other by two second pins 707, realizing the equal spacing adjustment of the bearing plates 6051. The size of the support surface of the bearing plate 6051 is adjustable, the support height of the bearing plate 6051 is adjustable, and the spacing between multiple bearing plates 6051 is adjustable. Therefore, it can adapt to the welding processing needs of more models of soft-pack battery cell bodies 5. The top of the connecting sleeve 701 is connected to the first adapter frame 7081, and the inner side of the first adapter frame 7081 is rotatably connected to the first adapter 7082. The top of the cross bracket 601 is connected to the second adapter frame 7085, and the inner side of the second adapter frame 7085 is rotatably connected to the second adapter 7084. A second hydraulic cylinder 7083 is installed between the first adapter 7082 and the second adapter 7084.

[0024] The specific implementation method is as follows: First, control the fifth hydraulic cylinder 806 to perform corresponding telescopic movements. The two fifth hydraulic cylinders 806 adjust the height of the bearing assembly 6 through the U-shaped frame 807 until the top of the bearing plate 6051 is at the same height as the bottom of the inner side of the electrode ear. Then, control the fourth hydraulic cylinder 805 to perform an extension movement. The bridging shaft 804 applies the thrust of the fourth hydraulic cylinder 805 to the two second track seats 803 respectively. The two second track seats 803 slide slowly on the two second slide rails 802 respectively. During this process, the bearing plate 6051 gradually inserts into the inner side of the electrode ear. Since the width of the bearing plate 6051 is smaller than the electrode ear, the bearing plate 6051 gradually inserts into the inner side of the electrode ear. The inner width of the ear allows the support plate 6051 to smoothly pass through the inner sides of multiple electrode ears. When the support plate 6051 passes through the last electrode ear, the fourth hydraulic cylinder 805 stops working, and then the second hydraulic cylinder 7083 extends. One end of the second hydraulic cylinder 7083 rotates inside the second adapter 7085 via the second adapter 7084, and its telescopic end rotates inside the second adapter 7085 via the first adapter 7082. This will push the connecting sleeve 701 to slide on the multiple support plates 6051, and the support plates 6051 push the multiple trapezoidal seats 702 towards the multiple wedges respectively. As the wedge-shaped seat 703 approaches, the trapezoidal seat 702 slides on the inclined surface of the wedge-shaped seat 703, thereby generating a lateral thrust on the wedge-shaped seat 703. Under the action of the lateral thrust, on the one hand, the wedge-shaped seat 703 drives the side rib plate 6053 to slide in the directional groove 6055 through the directional shaft 6056, and pulls the support spring 6057 to cause elastic deformation. On the other hand, the side rib plate 6053 drives multiple compensating ribs 6054 to slide in the compensating groove 6052. Since a single bearing plate 6051 is equipped with two side rib plates 6053, and multiple compensating ribs 6054 are connected to both side rib plates 6053, the wedge-shaped seat 7053 will have multiple compensating ribs 6054 connected to it. This provides comprehensive support for the inner top of the tab. Furthermore, since the spacing between the two side ribs 6053 on a single carrier plate 6051 is adjustable, it can adapt to the welding needs of different types of tabs, offering high flexibility and practicality. As the two side ribs 6053 on a single carrier plate 6051 move away from each other, the individual cells of the soft-pack battery cell body 5 can be corrected. Since the bottom of the individual cell is supported by multiple rolling sleeves 404 with an adapter design, the individual cell process of the soft-pack battery cell body 5 is easier, preventing the tab from being deformed due to excessive force, thus helping to ensure the subsequent welding quality.

[0025] Working principle and usage: After the soft-pack battery cell body 5 is placed on top of multiple rolling sleeves 404, the first hydraulic cylinder 205 built into the positive electrode clamp 2 and the negative electrode clamp 3 is simultaneously controlled to extend. The first hydraulic cylinder 205 pushes the truss 203, causing it to slide along the first slide rail 201 through multiple first track seats 202, which drives the clamps 204 on both sides to slowly approach the soft-pack battery cell body 5. Under the push of the clamps 204, the battery cell is moved to the longitudinal center position of the support component 4. At this time, its multiple sets of tabs are aligned with the corresponding side ribs 6053 to complete the longitudinal positioning. Then, the first hydraulic cylinder 205 is controlled to retract. Subsequently, the fifth hydraulic cylinder 806 is controlled to extend and retract, and the height of the bearing assembly 6 is adjusted by the U-shaped frame 807 until the top of the bearing plate 6051 is flush with the bottom of the inner side of the electrode ear. Then, the fourth hydraulic cylinder 805 is controlled to extend, and the thrust is transmitted to the two second track seats 803 through the bridging shaft 804, so that they slide slowly along the second slide rail 802, driving the bearing plate 6051 to gradually insert into the inner side of the electrode ear. Since the width of the bearing plate 6051 is smaller than the width of the inner side of the electrode ear, it can pass through all the electrode ears smoothly. After it has completely passed through the last electrode ear, the fourth hydraulic cylinder 805 is stopped. Next, the second hydraulic cylinder 7083 is activated to extend. Its cylinder body rotates inside the second adapter 7084 and the second adapter frame 7085, while the telescopic end rotates through the first adapter 7082. This pushes the connecting sleeve 701 to slide along multiple bearing plates 6051. The bearing plates 6051 push the trapezoidal seat 702 closer to the wedge seat 703. The trapezoidal seat 702 slides along the inclined surface of the wedge seat 703 and generates a lateral thrust, causing the wedge seat 703 to drive the side rib plate 6053 to slide along the directional axis 6056 in the directional groove 6055. At the same time, the tension support spring 6057 undergoes elastic deformation, and the side rib plate 6053 simultaneously drives multiple compensating ribs 6054 to slide in the compensating groove 6052. Each support plate 6051 is equipped with two side ribs 6053 that can move away from each other to provide full support for the top of the inner side of the tab and adapt to the welding requirements of different types of tabs. It is highly flexible and practical. This movement can also be used to correct the individual soft-pack battery cells. The bottom of the battery cell is supported by multiple rolling sleeves 404 with adapter design, which makes the adjustment process of the individual cells smoother, avoids the tabs from being deformed by force, and helps to ensure the subsequent welding quality. Finally, the third hydraulic cylinder 709 is controlled to extend and retract, pushing or pulling the sliding block 604 to move within the slide groove 602. Each bearing plate 6051 is rotatably connected to the first hinge rod 705 and the second hinge rod 706 arranged in a cross pattern via the first pin 704. The hinge rods of adjacent bearing plates 6051 are hinged to each other via the second pin 707, realizing the equal spacing adjustment of the bearing plates 6051. This system has the functions of adjustable support surface size, adjustable support height and adjustable spacing between plates, and can adapt to the welding and processing requirements of various models of soft-pack battery cell bodies 5.

[0026] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tab welding device for a soft-pack battery cell, comprising a base (1), characterized in that, The upper part of the base (1) is provided with a soft package battery cell body (5), the top of the base (1) is connected with a supporting assembly (4) for supporting the bottom of the soft package battery cell body (5), the top of the base (1) is respectively connected with a positive electrode clamp (2) and a negative electrode clamp (3) on both sides of the soft package battery cell body (5), and the positive electrode clamp (2) and the negative electrode clamp (3) are the same in structure. A same bearing assembly (6) is inserted into a plurality of tab groups of the soft package battery cell body (5), and the front end face of the base (1) is connected with a pushing assembly (8) for pushing the bearing assembly (6) to be inserted into the inner side of the plurality of tab groups.

2. The tab welding device for a jelly-roll battery cell according to claim 1, wherein The positive electrode clamp (2) comprises a plurality of first sliding rails (201) connected to the top of the base (1), a first rail seat (202) is slidably connected to each of the first sliding rails (201), a same truss (203) is connected to the plurality of first rail seats (202), a chuck (204) is connected to the inner side of the truss (203), a first hydraulic cylinder (205) is installed on the top of the base (1), and the telescopic end of the first hydraulic cylinder (205) is connected with the truss (203).

3. The tab welding device for a jelly-roll battery cell of claim 1, wherein, The supporting assembly (4) comprises a supporting plate (401) connected to the top of the base (1), a rolling groove (402) is formed in the top of the supporting plate (401), a plurality of rolling shafts (403) arranged in a linear and equidistant manner are rotatably connected to the inner wall of the rolling groove (402), a rolling sleeve (404) is rotatably connected to each of the rolling shafts (403), the soft package battery cell body (5) is composed of a plurality of soft package battery cells stacked together, and the top of each of the rolling sleeves (404) is connected with the bottom of each of the plurality of soft package battery cells.

4. The tab welding device for a jelly-roll battery cell of claim 1, wherein, The pushing assembly (8) comprises a side seat (801) connected to the front end face of the base (1), two second sliding rails (802) are connected to the top of the side seat (801), a second rail seat (803) is slidably connected to each of the second sliding rails (802), a bridging shaft (804) is connected between the two second rail seats (803), a fourth hydraulic cylinder (805) is installed on the top of the side seat (801), and the telescopic end of the fourth hydraulic cylinder (805) is connected with the bridging shaft (804). A fifth hydraulic cylinder (806) is installed on the top of each of the two second rail seats (803), and the telescopic end of each of the two fifth hydraulic cylinders (806) is connected with an inverted U-shaped frame (807).

5. The tab welding device for a pouch cell of claim 4, wherein, The bearing assembly (6) comprises a horizontal support (601) connected to the inner side of the U-shaped frame (807), a sliding groove (602) is formed in the side end face of the horizontal support (601), a fixing block (603) is clamped to the inner side wall of the sliding groove (602), a plurality of sliding blocks (604) are slidably connected to the inner side wall of the sliding groove (602) on both sides of the fixing block (603), and the side of each of the plurality of sliding blocks (604) and the fixing block (603) facing the soft package battery cell body (5) is connected with a bearing (605).

6. The tab welding device for a pouch cell of claim 5, wherein, The bearing (605) comprises a bearing plate (6051), one end of the bearing plate (6051) is connected with the fixed block (603) or the sliding block (604), the other side of the bearing plate (6051) is inserted into a group of longitudinally arranged tabs, a plurality of compensation grooves (6052) are formed in the side end face of the bearing plate (6051) corresponding to the tab positions, the side end faces of the two side rib plates (6053) are connected with the plurality of compensation grooves (6052), the side end faces of the side rib plates (6053) are connected with a plurality of compensation ribs (6054), the side rib plates (6053) are slidingly connected in the compensation grooves (6052) through the compensation ribs (6054), and the plurality of compensation ribs (6054) on the two side rib plates (6053) are arranged in a staggered manner.

7. The tab welding device for a pouch cell of claim 6, wherein, The side end face of the side rib plate (6053) is connected with a directional shaft (6056), a directional groove (6055) is formed in the side end face of the bearing plate (6051) corresponding to the directional shaft (6056), the directional shaft (6056) is insertedly connected in the directional groove (6055), the other end of the directional shaft (6056) is connected with a supporting spring (6057), and the directional shaft (6056) is elastically supported and connected with the bottom of the directional groove (6055) through the supporting spring (6057).

8. The tab welding device for a pouch cell of claim 5, wherein, A width adjusting assembly (7) is arranged between the plurality of bearing (605), the width adjusting assembly (7) comprises a connecting sleeve (701) sleeved on the plurality of bearing plates (6051), the rear end face of the connecting sleeve (701) is connected with a plurality of trapezoidal seats (702), the two inclined surfaces of the trapezoidal seat (702) are slidingly connected with wedge-shaped seats (703), and the bottoms of the two wedge-shaped seats (703) are connected with the tops of the two side rib plates (6053) respectively. The top of the bearing plate (6051) is rotationally connected with a first pin shaft (704), the first pin shaft (704) is rotationally connected with a first hinged rod (705) and a second hinged rod (706) respectively, the second hinged rod (706) and the first hinged rod (705) are arranged in a cross manner, the ends of the first hinged rod (705) and the second hinged rod (706) are hingedly connected with an adjacent group of first hinged rods (705) and second hinged rods (706) through two second pin shafts (707), and the sliding groove (602) is provided with a third hydraulic cylinder (709), and the telescopic end of the third hydraulic cylinder (709) is connected with one of the sliding blocks (604).

9. The tab welding device for a pouch cell of claim 8, wherein, The top of the connecting sleeve (701) is connected with a first adapter frame (7081), the inner side of the first adapter frame (7081) is rotationally connected with a first adapter head (7082), the top of the horizontal support (601) is connected with a second adapter frame (7085), the inner side of the second adapter frame (7085) is rotationally connected with a second adapter head (7084), and the first adapter head (7082) and the second adapter head (7084) are provided with a second hydraulic cylinder (7083).

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