Automatic welding assembly device for cylindrical lithium battery cover and tab

Abstract

The application discloses a cylindrical lithium battery cap and tab automatic welding assembly device, and relates to the technical field of cylindrical lithium battery manufacturing. The application discloses a cylindrical lithium battery cap and tab automatic welding assembly device, and relates to the technical field of cylindrical lithium battery manufacturing. The application discloses a cylindrical lithium battery cap and tab automatic welding assembly device, and relates to the technical field of cylindrical lithium battery manufacturing. The application discloses a cylindrical lithium battery cap and tab automatic welding assembly device, and relates to the technical field of cylindrical lithiu

Description

Technical Field

[0001] This invention relates to the field of cylindrical lithium battery manufacturing technology, specifically to an automatic welding and assembly device for cylindrical lithium battery caps and tabs. Background Technology

[0002] With the rapid development of new energy vehicles, portable consumer electronics, energy storage power stations and other fields, the market demand for lithium batteries, as core energy storage components, continues to surge. Among them, cylindrical lithium batteries have become one of the most widely used battery categories in the industry due to their advantages such as standardized structure, strong adaptability, controllable cost, and stable cycle performance. The welding and assembly of the cap and the tab is the core key process in the production and manufacturing of cylindrical lithium batteries, which directly determines the battery's conductivity, structural stability, sealing performance and safety. Welding alignment accuracy, welding uniformity, assembly consistency and production automation level are the core factors restricting the yield and mass production efficiency of cylindrical lithium batteries. Misalignment, poor welding, missing welding or uneven welding stress can easily occur when welding the cap and the tab, which can easily lead to high battery internal resistance, abnormal heating, and excessive capacity decay. In severe cases, it can also cause safety hazards such as short circuit, bulging or even explosion. In the field of lithium battery welding equipment manufacturing, metal cutting and welding equipment manufacturing technologies such as automatic and semi-automatic electric arc and plasma arc welding machines have been widely used. At the same time, various welding processes such as resistance welding, ultrasonic welding, and laser welding are gradually being adapted to lithium battery component processing scenarios. Currently, the traditional cylindrical lithium battery cap and electrode assembly equipment in the industry mostly adopts a split processing structure, setting up independent processes such as cell conveying, cap feeding, electrode feeding, and welding processing. The equipment in each process has poor connection and low automation integration. Existing equipment generally relies on manual labor to complete the alignment and auxiliary positioning of cells, caps, and electrodes. There are many manual intervention links, which not only significantly increases the labor production cost, but also causes inconsistent component alignment accuracy due to human operation errors, making it difficult to ensure the consistency of product quality in mass production. Existing welding and assembly equipment suffers from several technical defects. First, the conveying and positioning structures for cells, caps, and tabs are rudimentary, lacking dedicated high-precision fixtures and adaptive positioning mechanisms. This makes them prone to shifting and shaking during material transport, and causes deformation, wrinkling, and misalignment of the tabs. Precise alignment of the caps and tabs is impossible, directly reducing welding accuracy and strength, and hindering product yield improvement. Second, traditional welding equipment features fixed welding stations with low operational freedom. It cannot adaptively adjust the welding position and trajectory based on material specifications and alignment deviations, resulting in poor adaptability and difficulty in meeting the production and processing needs of different types of cylindrical lithium batteries. Thirdly, most semi-automatic welding equipment on the market suffers from severe process bottlenecks, mismatched operating rhythms of each station, poor production continuity, and low overall production efficiency. This makes it unsuitable for the current demand for large-scale, batch, and high-efficiency mass production of lithium batteries. Furthermore, the existing welding equipment has an unreasonable structural design, often adopting a single-station operation mode with a concentric turntable. The station layout is not compact and cannot achieve simultaneous material feeding, shaping, and welding operations at multiple stations. The equipment has extremely low space utilization and operating efficiency, and lacks auxiliary functions such as tab pre-shaping and material self-adaptive clamping and positioning. The flatness and regularity of the tabs are insufficient, further affecting the welding quality and the performance of the finished battery. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an automatic welding and assembly device for cylindrical lithium battery caps and tabs, which solves the problems of low automation, poor alignment accuracy, unstable welding quality, poor process connection, low production efficiency, and poor product consistency during the welding and assembly of cylindrical lithium battery caps and tabs.

[0004] (II) Technical Solution To achieve the goals of high automation, good alignment accuracy, stable welding quality, smooth process connection, high production efficiency, and good product consistency in the welding and assembly of cylindrical lithium battery caps and tabs, this invention achieves this through the following technical solution: An automatic welding and assembly device for cylindrical lithium battery caps and tabs, comprising a base, a cell conveying turntable on the base, a cell conveying structure on the cell conveying turntable, a cap conveying turntable obliquely above the cell conveying turntable, a cap conveying structure on the cap conveying turntable, a tab conveying turntable obliquely above the cap conveying turntable, a tab conveying structure on the tab conveying turntable, a welding structure between the cap conveying structure and the tab conveying structure, and a control unit structure mounted on the side of the base.

[0005] The base includes a battery cell feeding conveyor belt, a feeding electric rod, a stepped platform, a cap vibrating plate, and a discharge conveyor belt. The battery cell feeding conveyor belt and the discharge conveyor belt are respectively located at the loading end and the unloading end of the battery cell conveying turntable. The feeding electric rod is located next to the battery cell feeding conveyor belt, and an arc-shaped push block is installed on the piston end. The stepped platform is fixed on the base. The cap vibrating plate is installed on the stepped platform, and the straight vibration track port on the cap vibrating plate is aligned with the cap conveying structure. One motor is installed on the base, and its output end is fixedly connected to the battery cell conveying turntable. Two motors are installed on the stepped platform, and the output ends of the two motors are respectively fixedly connected to the cap conveying turntable and the tab conveying turntable. The battery cell conveying turntable, the cap conveying turntable, and the tab conveying turntable are arranged from low to high and have different centers.

[0006] Preferably, the cell conveying structure includes a cell conversion servo motor installed at the bottom of the cell conveying turntable. The output end of the cell conversion servo motor is fixed to a cell transposition turntable, which is rotatably connected to the cell conveying turntable. Six cell transposition turntables are equidistantly arranged along the circumference of the cell conveying turntable. Three cell fixtures are equidistantly arranged circumferentially on the cell transposition turntable. Each cell fixture has a side opening and a slot inside, with the side opening communicating with the slot. The depth of the slot is greater than the depth of the side opening. The slot contains a movably inserted battery cell body. A lifting rod is also installed inside the battery cell fixture. A push plate is fixed to the top of the lifting rod and is axially slidably connected to the slot. An inclined groove is formed on the inner wall of the slot, and the inclined groove is positioned opposite the side opening. A trapezoidal slider slides inside the inclined groove. A rectangular groove is formed on the push plate, and a rectangular slider slides inside the rectangular groove. A spring is fixed between the side of the rectangular slider and the inner wall of the rectangular groove. A connecting rod is fixed between the rectangular slider and the trapezoidal slider.

[0007] Preferably, the inclined surface on one side of the trapezoidal slider is adapted to the inclined surface on the inclined groove, and the other side of the trapezoidal slider is in contact with the battery cell body.

[0008] Preferably, the cap conveying structure includes cap fixtures fixed on a cap conveying turntable. Three sets of cap fixtures are equidistantly arranged along the circumference of the cap conveying turntable, with three fixtures in each set. Each set of three cap fixtures is aligned with three linear vibration track outlets on a cap vibrating plate. An upper servo motor and a lower servo motor are respectively mounted above and below the surface of the cap fixture via brackets. Cap gear discs are fixed to the output ends of both the upper and lower servo motors. An upper rotating ring and a lower rotating ring rotate above and below the surface of the cap fixture via bearings. Racks are fixed to the surfaces of both the upper and lower rotating rings, and the racks mesh with the cap gear discs. Both the upper and lower rotating rings have arc-shaped grooves on their end faces, and these grooves are not concentric with the upper and lower rotating rings. An upper push-pull rod and a lower push-pull rod are radially slidable above and below the surface of the cap fixture, respectively. A sliding pin is fixed to one outer end of each of the upper and lower push-pull rods, and the sliding pin is slidably connected to the arc-shaped groove. An upper limit support plate is fixed to one inner end of the upper push-pull rod inside the cap fixture, and a lower limit support plate is fixed to one inner end of the lower push-pull rod inside the cap fixture. Support plate grooves are formed on both the upper and lower inner walls of the cap fixture, and these grooves are adapted to the upper and lower limit support plates, respectively. A cap body is disposed inside the cap fixture.

[0009] Preferably, the upper limit plate and the lower limit plate are symmetrically arranged, and the cap body is adapted to the upper limit plate and the lower limit plate.

[0010] Preferably, the tab conveying structure includes a tab conversion servo motor mounted on a tab conveying turntable. A tab gear disk is fixed to the output end of the tab conversion servo motor. Three tab turntables are equidistantly arranged circumferentially on the tab conveying turntable. A toothed ring is fixed to the surface of each tab turntable, and the toothed ring meshes with the tab gear disk. Three shaping frames are fixed to each tab turntable, with the ports of the three shaping frames aligned with the three outlets of the external tab unloading rack. An upper clamping electric rod and a lower clamping electric rod are fixed above and below each shaping frame, respectively. An upper clamping plate is fixed to the upper clamping electric rod, and a lower clamping plate is fixed to the lower clamping electric rod. A front shaping plate is fixed to the inner front end of each shaping frame. A rear shaping plate is fixed at the rear end. The front and rear shaping plates are located between the upper and lower clamping plates. A shaping servo motor is installed at the top of both the front and rear shaping plates. A lead screw is fixed at the output end of the shaping servo motor, and the bottom end of the lead screw is rotatably connected to the bottom of the front and rear shaping plates through a bearing. A gear rack is fixed on the side of both the front and rear shaping plates. A guide groove is opened on both the front and rear shaping plates. A guide block slides inside the guide groove. A driven gear disk rotates outside the guide block. A shaping roller rotates between the two driven gear disks. The two ends of the shaping roller pass through the guide block and are fixedly connected to the driven gear disk. The lead screw and the shaping roller are staggered.

[0011] Preferably, the front shaping plate and the rear shaping plate are symmetrically arranged, and the electrode tabs are located between the two upper clamping plates, the two shaping rollers and the two lower clamping plates.

[0012] Preferably, the welding structure includes a welding frame fixed on a stepped platform, an X-axis electric rod mounted on the welding frame, a vertical frame fixed on the X-axis electric rod, a Z-axis electric rod mounted on the vertical frame, a vertical slider fixed on the Z-axis electric rod and slidably connected to the vertical frame, a horizontal frame fixed to the side of the vertical slider, a Y-axis electric rod mounted on the horizontal frame, a horizontal slider fixed on the Y-axis electric rod and slidably connected to the horizontal frame, and a laser welding head mounted on the horizontal slider, the laser welding head being located between the top end of the cap fixture and the bottom end of the shaping frame.

[0013] Preferably, the X-axis electric rod, Y-axis electric rod, and Z-axis electric rod form an X-axis, Y-axis, and Z-axis coordinate system.

[0014] Preferably, the control unit structure is electrically connected to the electric drive control equipment on the base, the cell conveying structure, the cap conveying structure, the tab conveying structure, and the welding structure.

[0015] (III) Beneficial Effects This invention provides an automatic welding and assembly device for cylindrical lithium battery caps and tabs. It has the following advantages: 1. This device, through multiple sets of rotating fixture stations and a multi-channel synchronous feeding structure, enables simultaneous parallel operation of multiple processes, including automatic cell feeding and positioning, cap sorting and clamping, tab shaping and calibration, laser welding, and finished product unloading. The entire process relies on the control unit structure to uniformly regulate the coordinated operation of each drive component, eliminating the need for manual intervention in material alignment, placement, calibration, and other auxiliary operations. This significantly reduces manual intervention and lowers labor production costs. At the same time, the multi-station cyclic operation mode greatly improves the equipment's space utilization and operational continuity, effectively overcoming the bottlenecks of slow production pace and limited capacity of traditional semi-automatic equipment. It can meet the needs of large-scale, batch, and high-efficiency mass production of cylindrical lithium batteries. The device adopts a layered heterogeneous multi-station integrated layout, with high automation integration and significantly improved mass production efficiency.

[0016] 2. This device addresses the technical pain points of traditional equipment, such as poor positioning accuracy, easy material displacement, and easy deformation of the electrode tabs. It features a dedicated adaptive positioning and shaping structure. The cell conveying structure achieves self-adaptive and precise cell fixation through a cell fixture and trapezoidal slider linkage clamping structure, eliminating shaking and displacement during cell conveying and station switching. The cap conveying structure, relying on symmetrical upper and lower limiting plates and a servo eccentric transmission structure, can perform all-round posture calibration and centering clamping of the caps, ensuring stable welding reference for the caps. The electrode tab conveying structure innovatively incorporates a front and rear shaping plate and rolling shaping roller cooperation mechanism, which can correct wrinkles and bends. The tabs are leveled and shaped to eliminate deformation and misalignment at the source. Combined with a laser welding structure with an adjustable three-dimensional coordinate system, the welding position and trajectory can be adaptively fine-tuned to accurately correct minor alignment deviations of materials. This completely avoids defects such as incomplete welding, missed welding, off-center welding, and uneven welding stress, effectively reducing quality problems such as abnormal battery internal resistance, overheating, and excessive capacity decay. It significantly improves product yield and mass production quality consistency, ensuring the conductivity and safety of the finished battery. Equipped with a multi-level precise positioning and tab pre-shaping structure, welding defects are completely resolved, resulting in excellent product welding quality and consistency.

[0017] 3. This device overcomes the limitations of traditional welding equipment, which has fixed workstations and poor adaptability. It constructs a three-dimensional welding adjustment coordinate system using X, Y, and Z-axis electric rods, enabling the laser welding head to achieve omnidirectional, high-precision position and trajectory adjustment. This allows it to adapt to the welding needs of different models and specifications of cylindrical lithium battery caps and tabs, making the equipment more versatile. Furthermore, each functional structure adopts independent servo drive and modular design. The three turntables can be independently speed-adjusted and started / stopped, flexibly matching the operation rhythm of each process according to different production conditions, avoiding process interruptions and material losses. In addition, the positioning, clamping, and shaping structures of each fixture adopt adaptive design, ensuring stable material fixation and smooth motion transmission during operation. The equipment has a low failure rate and high operational reliability, allowing for long-term continuous and stable operation, effectively reducing equipment maintenance costs and production losses, and further improving the overall economic benefits of lithium battery welding and assembly production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an automatic welding and assembly device for a cylindrical lithium battery cap and tabs according to the present invention; Figure 2 This is a schematic diagram of the cell conveying structure of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 3 This is a partial cross-sectional view of the structural cell fixture of the automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 4 This invention relates to an automatic welding and assembly device for cylindrical lithium battery caps and tabs. Figure 3Enlarged view of a portion of the structure at point A; Figure 5 This is a schematic diagram of the cell body cutting structure of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention; Figure 6 This is a schematic diagram of the structural cap fixture of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention; Figure 7 This is a schematic diagram of the upper rotating ring and lower conversion structure of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention; Figure 8 This is a partial cross-sectional view of the structural cover fixture of the automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 9 This is a schematic diagram of the lower limit plate holding the cap body of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 10 This is a schematic diagram of the upper limit plate holding the cap body of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 11 This is a schematic diagram of the electrode conveying structure of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 12 This is a partial cross-sectional view of the structural shaping frame of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 13 This is a schematic diagram of the front and rear shaping plates of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention. Figure 14 This invention relates to an automatic welding and assembly device for cylindrical lithium battery caps and tabs. Figure 13 Enlarged schematic diagram of the structure at point B in the middle Figure 15 This is a schematic diagram of the welding structure of an automatic welding and assembly device for cylindrical lithium battery caps and tabs according to the present invention.

[0019] Among them, 100 is the base; 101 is the battery cell feeding conveyor belt; 102 is the feeding electric rod; 103 is the stepped platform; 104 is the cap vibrating plate; 105 is the unloading conveyor belt; 200 is the battery cell conveying turntable; 300 is the battery cell conveying structure; 301 is the battery cell conversion servo motor; 302 is the battery cell transposition turntable; 303 is the battery cell fixture; 304 is the side opening; 305 is the slot; 306 is the battery cell body; 307 is the lifting rod; 308 is the push plate; and 309 is the inclined groove. 310. Trapezoidal slider; 311. Rectangular groove; 312. Rectangular slider; 313. Spring; 314. Connecting rod; 400. Cap conveyor turntable; 500. Cap conveyor structure; 501. Cap fixture; 502. Upper servo motor; 503. Lower servo motor; 504. Cap gear plate; 505. Upper rotating ring; 506. Lower rotating ring; 507. Rack; 508. Arc groove; 509. Upper push-pull rod; 510. Lower push-pull rod; 511. Sliding pin; 51 2. Upper limit support plate; 513. Lower limit support plate; 514. Support plate groove; 515. Cap body; 600. Electrode conveying turntable; 700. Electrode conveying structure; 701. Electrode conversion servo motor; 702. Electrode gear plate; 703. Electrode turntable; 704. Gear ring; 705. Shaping frame; 706. Upper clamping electric rod; 707. Lower clamping electric rod; 708. Upper clamping plate; 709. Lower clamping plate; 710. Front shaping plate; 711. Rear shaping plate; 712. Shaping servo motor; 713. Lead screw; 714. Gear rack; 715. Guide groove; 716. Guide block; 717. Driven gear plate; 718. Shaping roller; 800. Welding structure; 801. Welding frame; 802. X-axis electric rod; 803. Vertical frame; 804. Z-axis electric rod; 805. Vertical slider; 806. Horizontal frame; 807. Y-axis electric rod; 808. Horizontal slider; 809. Laser welding head; 900. Control unit structure. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0021] Please see Figures 1-15 This invention provides a technical solution: an automatic welding and assembly device for cylindrical lithium battery caps and tabs, including a base 100, a cell conveying turntable 200 disposed on the base 100, a cell conveying structure 300 disposed on the cell conveying turntable 200, a cap conveying turntable 400 disposed diagonally above the cell conveying turntable 200, a cap conveying structure 500 disposed on the cap conveying turntable 400, a tab conveying turntable 600 disposed diagonally above the cap conveying turntable 400, a tab conveying structure 700 disposed on the tab conveying turntable 600, a welding structure 800 disposed between the cap conveying structure 500 and the tab conveying structure 700, and a control unit structure 900 mounted on the side of the base 100; The base 100 includes a battery cell feeding conveyor belt 101, a feeding electric rod 102, a stepped platform 103, a cap vibrating plate 104, and a discharge conveyor belt 105. The battery cell feeding conveyor belt 101 and the discharge conveyor belt 105 are respectively located at the loading end and the unloading end of the battery cell conveying turntable 200. The feeding electric rod 102 is located next to the battery cell feeding conveyor belt 101, and an arc-shaped push block is installed on the piston end. The stepped platform 103 is fixed on the base 100, and the cap vibrating plate 104 is installed on the stepped platform 103, with a straight vibrating rail on the cap vibrating plate 104. The guide port is aligned with the cap conveyor structure 500. A motor is mounted on the base 100, and its output end is fixedly connected to the cell conveyor turntable 200. Two motors are mounted on the stepped platform 103, and the output ends of the two motors are fixedly connected to the cap conveyor turntable 400 and the electrode conveyor turntable 600, respectively. The cell conveyor turntable 200, the cap conveyor turntable 400, and the electrode conveyor turntable 600 are arranged from low to high and have different centers. The base 100 serves as the supporting foundation for the entire machine, used to integrate and install all functional components, ensuring... To ensure the stability and overall integrity of the equipment operation, a cell conveying turntable 200 is installed on the base 100, and a cell conveying structure 300 is mounted on the cell conveying turntable 200 to realize automatic feeding, precise positioning, adaptive clamping, and station switching of cylindrical lithium battery cells. A cap conveying turntable 400 is offset diagonally above the cell conveying turntable 200, and a cap conveying structure 500 is mounted on the cap conveying turntable 400 to complete the automatic sorting, feeding, precise clamping, and attitude calibration of battery caps. The cap conveying turntable 400 is further offset diagonally above... The base 100 is equipped with an electrode conveying turntable 600, on which an electrode conveying structure 700 is installed. This enables automatic electrode feeding, shaping and calibration, and flat clamping, preventing electrode wrinkles and deformation from affecting welding accuracy. A welding structure 800 is set between the cap conveying structure 500 and the electrode conveying structure 700 at the alignment station to complete the high-precision laser welding operation between the cap and the electrode. A control unit structure 900 is fixedly installed on the side of the base 100, serving as the core control center of the whole machine, and coordinating the coordinated operation of all electrical, transmission, and welding components. The cell conveying turntable 200, cap conveying turntable 400, and tab conveying turntable 600 adopt a layered layout from low to high and with concentric offsets, which completely changes the traditional concentric single-station operation mode, effectively expands the equipment operation space, realizes multi-station synchronous feeding, shaping, welding, and unloading operations, greatly improves the equipment space utilization and production efficiency, and avoids interference between various processes, ensuring production continuity. The base 100 specifically includes a cell feeding conveyor belt 101, a feeding electric rod 102, a stepped platform 103, a cap vibrating plate 104, and a discharge conveyor belt 105. The cell feeding conveyor belt 101 is arranged at the feeding end of the cell conveying turntable 200 and is used to continuously convey the cell body 306 to be processed. The discharge conveyor belt 105 is arranged at the discharging end of the cell conveying turntable 200 and is responsible for automatically conveying the finished battery after welding and assembly. The feeding electric rod 102 is fixed to the side of the cell feeding conveyor belt 101, and its piston end is equipped with an arc-shaped push block. The arc structure can fit the outer wall of the cylindrical cell to avoid scratching the cell shell during the pushing process. Through the extension and retraction of the feeding electric rod 102, the cell that has been conveyed to the designated position is accurately pushed into the fixture of the cell conveying structure 300 to complete the automatic feeding. The stepped platform 103 is fixedly installed on the table surface of the base 100 with bolts, providing an installation benchmark for the high-level turntable and welding components, ensuring the installation accuracy and structural stability of each high-level operating component. The cap vibrating plate 104 is fixedly assembled on the low-level table surface of the stepped platform 103. The cap vibrating plate 104 is equipped with three sets of parallel straight vibration tracks. The discharge ports of the three sets of straight vibration tracks are aligned one-to-one with the three sets of fixture positions of the cap conveying structure 500, realizing the automatic sorting, directional conveying and batch feeding of the cap body 515. A drive motor is fixedly installed at the bottom of the base 100. The output end of the motor is fixedly connected to the center of the cell conveying turntable 200, providing power for the rotation position switching of the cell conveying turntable 200. Two independent drive motors are fixedly installed on the table surface of the stepped platform 103. The output ends of the two motors are fixedly connected to the center of the cap conveying turntable 400 and the electrode conveying turntable 600, respectively, realizing independent speed adjustment and independent start and stop of the three turntables. It can match the operation rhythm of each process according to production needs and eliminate the problems of process jamming and material accumulation.

[0022] In this embodiment, the battery cell conveying structure 300 includes a battery cell conversion servo motor 301 installed at the bottom of the battery cell conveying turntable 200. A battery cell transposition turntable 302 is fixed to the output end of the battery cell conversion servo motor 301 and is rotatably connected to the battery cell conveying turntable 200. Six battery cell transposition turntables 302 are equidistantly arranged along the circumference of the battery cell conveying turntable 200. Three battery cell fixtures 303 are equidistantly arranged along the circumference of the battery cell transposition turntable 302. A side opening 304 is provided on the side of each battery cell fixture 303, and a slot 305 is provided inside the battery cell fixture 303. The side opening 304 communicates with the slot 305, and the depth of the slot 305 is greater than the depth of the side opening 304. The battery cell body 306 is movably inserted into the slot 305. The battery cell fixture 303 is also equipped with a lifting rod 307. The top of the lifting rod 307 is fixed with a push plate 308, and the push plate 308 is axially slidably connected to the slot 305. The inner wall of the slot 305 is provided with an inclined groove 309, and the inclined groove 309 is located opposite to the side opening 304. A trapezoidal slider 310 slides inside the inclined groove 309. A rectangular slide groove 311 is provided on the push plate 308. A rectangular slider 312 slides inside the rectangular slide groove 311. A spring piece 313 is fixed between the side of the rectangular slider 312 and the inner wall of the rectangular slide groove 311. A connecting rod 314 is fixed between the rectangular slider 312 and the trapezoidal slider 310. Specifically, the battery cell conveying structure 300, as the core component for precise battery cell positioning and workstation switching, includes a battery cell conversion servo motor 301 fixedly installed at the bottom of the battery cell conveying turntable 200. A battery cell transfer turntable 302 is vertically fixed to the output end of the servo motor 301. The battery cell transfer turntable 302 is rotatably assembled with the battery cell conveying turntable 200, allowing independent rotation to complete fine-tuning of the battery cell attitude and precise workstation alignment. Six battery cell transfer turntables 302 are equidistantly arranged along the circumference of the battery cell conveying turntable 200. Three battery cell fixtures 303 are equidistantly mounted on the surface of each turntable 302 along the circumference, forming a multi-workstation cyclic operation structure, significantly improving the efficiency of battery cell positioning. To improve the efficiency of core processing, the battery cell fixture 303 has a side opening 304 and an internal cylindrical slot 305. The side opening 304 and the slot 305 are interconnected, and the depth of the slot 305 is greater than the depth of the side opening 304. This ensures that the battery cell body 306 can be smoothly inserted into the slot 305 from the side opening 304, while preventing the battery cell from coming out. The cylindrical battery cell body 306 is movably inserted into the slot 305. A lifting rod 307 is embedded in the bottom of the battery cell fixture 303. A push plate 308 is fixed at the top of the telescopic end of the lifting rod 307. The outer diameter of the push plate 308 is adapted to the inner diameter of the slot 305, and it can slide smoothly along the axial direction of the slot 305 to realize the lifting, fine adjustment and unloading of the battery cell.

[0023] In this embodiment, the inclined surface on one side of the trapezoidal slider 310 is adapted to the inclined surface on the inclined groove 309, and the other side of the trapezoidal slider 310 is in contact with the battery cell body 306. Specifically, a sloping groove 309 is provided on the inner wall of the slot 305 opposite to the side opening 304. A trapezoidal slider 310 is slidably mounted inside the sloping groove 309. The inclined surface of the trapezoidal slider 310 is perfectly matched with the inclination angle of the sloping groove 309, allowing it to slide smoothly along the sloping groove 309. The vertical side of the trapezoidal slider 310 is in contact with the outer wall of the cell body 306, which can be used to push the cell body 306 out of the side opening 304 into the cell jig 303. A rectangular slide groove 311 is provided on the push plate 308, and a rectangular slider is slidably mounted inside the rectangular slide groove 311. 312, A spring piece 313 is fixedly mounted between the side of the rectangular slider 312 and the inner wall of the rectangular slide groove 311. The spring piece 313 always maintains a pushing state to ensure the stability of the sliding reset of the rectangular slider 312. The rectangular slider 312 and the trapezoidal slider 310 are fixedly connected by a connecting rod 314 to realize linkage transmission. When the push plate 308 is axially raised and lowered, the trapezoidal slider 310 can be driven to extend and retract laterally through the connecting rod 314 to complete the adaptive clamping and loosening positioning of the battery cell, effectively solving the problems of positioning offset and unstable fixation of traditional fixtures.

[0024] In this embodiment, the cap conveying structure 500 includes cap fixtures 501 fixed on the cap conveying turntable 400. Three sets of cap fixtures 501 are equidistantly arranged along the circumference of the cap conveying turntable 400, with three cap fixtures 501 in each set. Each set of three cap fixtures 501 is aligned with three linear vibration track outlets on the cap vibrating plate 104. An upper servo motor 502 and a lower servo motor 503 are respectively mounted above and below the surface of the cap fixture 501 via brackets. Cap gear discs 504 are fixed to the output ends of both the upper and lower servo motors 502 and 503. An upper rotating ring 505 and a lower rotating ring 506 rotate above and below the surface of the cap fixture 501 via bearings. Racks 507 are fixed to the surfaces of both the upper and lower rotating rings 505 and 506, and the racks 507 mesh with the cap gear discs 504. Each end face of 506 is provided with an arc-shaped groove 508, and the arc-shaped groove 508 is not concentric with the upper rotating ring 505 and the lower rotating ring 506. An upper push-pull rod 509 and a lower push-pull rod 510 are radially slidable above and below the surface of the cap fixture 501, respectively. A sliding pin 511 is fixed to one outer end of the upper push-pull rod 509 and the lower push-pull rod 510, and the sliding pin 511 is slidably connected to the arc-shaped groove 508. The inner end of the upper push-pull rod 509 is... An upper limit support plate 512 is fixed inside the cap fixture 501, and a lower limit support plate 513 is fixed inside the cap fixture 501 at one end of the lower push-pull rod 510. Support plate grooves 514 are provided on the upper and lower sides of the inner wall of the cap fixture 501, and the support plate grooves 514 are respectively adapted to the upper limit support plate 512 and the lower limit support plate 513. A cap body 515 is provided inside the cap fixture 501. Specifically, the cap conveying structure 500 is used to achieve precise clamping, posture calibration, and alignment conveying of caps. It includes cap fixtures 501 fixed on the cap conveying turntable 400. Three sets of cap fixtures 501 are equidistantly arranged along the circumference of the cap conveying turntable 400, with each set containing three cap fixtures 501. The feed ends of the three cap fixtures 501 in each set correspond to the three linear vibration track outlets of the cap vibrating plate 104, achieving synchronous feeding from three directions and improving cap feeding efficiency. Servo motors 502 and lower servo motors 503 are respectively mounted on the upper and lower sides of the surface of each cap fixture 501 via fixed brackets. Cap gear discs 504 are fixedly mounted on the output ends of both the upper and lower servo motors 502 and 503. Bearings are used to rotate the cap fixtures 501 on the upper and lower sides. The upper and lower rotating rings 505 and 506 are fixedly connected to the outer ring surfaces of the upper and lower rotating rings 505 and 506, respectively. The rack 507 meshes with the corresponding cap gear 504 for transmission. The gear 504 is driven to rotate by a servo motor, which drives the rotating ring to rotate smoothly. The end faces of the upper and lower rotating rings 505 and 506 are provided with eccentric arc grooves 508. The arc grooves 508 are not centered with the rotating ring, forming an eccentric transmission structure. The upper push-pull rod 509 and the lower push-pull rod 510 are radially slidably mounted on the upper and lower sides of the cap fixture 501, respectively. The outer ends of the upper push-pull rod 509 and the lower push-pull rod 510 are fixedly mounted with sliding pins 511. The sliding pins 511 are slidably engaged inside the arc grooves 508. When the rotating ring rotates, the eccentric arc grooves 508 squeeze the sliding pins 511, which drives the push-pull rods to make radial extension and retraction linear movements.

[0025] In this embodiment, the upper limit plate 512 and the lower limit plate 513 are symmetrically arranged, and the cap body 515 is adapted to the upper limit plate 512 and the lower limit plate 513. Specifically, an upper limit plate 512 is fixed to one end of the inner side of the upper push-pull rod 509, and a lower limit plate 513 is fixed to one end of the inner side of the lower push-pull rod 510. The inner wall of the cap fixture 501 has corresponding upper and lower plate grooves 514. The plate grooves 514 are adapted to the size of the limit plate, which can realize the storage and hiding of the plate. The upper limit plate 512 and the lower limit plate 513 are symmetrically arranged to form a cap clamping station. It is precisely adapted to the shape and structure of the cap body 515, which can realize the self-adaptive clamping and posture fine adjustment of the cap, and ensure that the welding position of the cap is accurate and without deviation.

[0026] In this embodiment, the tab conveying structure 700 includes a tab conversion servo motor 701 mounted on a tab conveying turntable 600. A tab gear disk 702 is fixed to the output end of the tab conversion servo motor 701. Three tab turntables 703 are equidistantly arranged circumferentially on the tab conveying turntable 600. A toothed ring 704 is fixed to the surface of each tab turntable 703, and the toothed ring 704 meshes with the tab gear disk 702. Three shaping frames 705 are fixed to each tab turntable 703. The ports of the three shaping frames 705 are aligned with the three outlets of the external tab unloading rack. An upper clamping electric rod 706 and a lower clamping electric rod 707 are fixed above and below each shaping frame 705, respectively. An upper clamping plate 708 is fixed to the upper clamping electric rod 706, and a lower clamping plate 709 is fixed to the lower clamping electric rod 707. A front shaping plate 710 is fixed to the front end of the inner part of the shaping frame 705, and a rear shaping plate 710 is fixed to the rear end. Plate 711, front shaping plate 710, and rear shaping plate 711 are located between upper clamping plate 708 and lower clamping plate 709. A shaping servo motor 712 is mounted at the top of each of the front and rear shaping plates 710 and 711. A lead screw 713 is fixed to the output end of each shaping servo motor 712, and the bottom end of the lead screw 713 is rotatably connected to the bottom of the front and rear shaping plates 710 and 711 via bearings. The front and rear shaping plates 710 and 711... The sides are fixed with toothed rows 714. The front shaping plate 710 and the rear shaping plate 711 are both provided with guide grooves 715. The guide block 716 slides inside the guide groove 715. The driven toothed disk 717 rotates on the outside of the guide block 716. The shaping roller 718 rotates between the two driven toothed disks 717. The two ends of the shaping roller 718 pass through the guide block 716 and are fixedly connected to the driven toothed disk 717. The lead screw 713 is staggered from the shaping roller 718. Specifically, the tab conveying structure 700 is the core structure that ensures the flatness and precise welding of the tabs. It can complete the entire process of tab feeding, clamping, shaping, and alignment. It includes a tab conversion servo motor 701 fixedly installed on the tab conveying turntable 600, a tab gear plate 702 fixed at the output end of the tab conversion servo motor 701, three tab turntables 703 equidistantly arranged on the circumferential direction of the tab conveying turntable 600, a gear ring 704 fixed on the outer ring of the tab turntable 703, and the gear ring 704 and the tab gear plate 702 are connected. 02. Meshing transmission: Driven by a servo motor, the electrode tab turntable 703 can achieve precise angle rotation, completing station switching and attitude calibration. Each electrode tab turntable 703 is fixedly equipped with three shaping frames 705. The feeding ports of the three shaping frames 705 correspond one-to-one with the three discharge ports of the external electrode tab unloading rack, achieving synchronous feeding of the three electrode tabs. The upper clamping electric rod 706 and lower clamping electric rod 707 are respectively fixed to the upper and lower ends of the shaping frame 705. The telescopic end of the upper clamping electric rod 706 is fixed with an upper clamping plate 708, and the lower clamping... The lower clamping plate 709 is fixed at the telescopic end of the electric rod 707. The relative movement of the upper clamping plate 708 and the lower clamping plate 709 achieves initial clamping and fixation of the electrode tabs, preventing displacement. The front shaping plate 710 and the rear shaping plate 711 are symmetrically fixed inside the shaping frame 705. The front shaping plate 710 and the rear shaping plate 711 are located between the upper clamping plate 708 and the lower clamping plate 709, forming the electrode tab shaping operation area. A shaping servo motor 712 is fixed to the top of both the front shaping plate 710 and the rear shaping plate 711 for shaping. A vertical lead screw 713 is fixed at the output end of the servo motor 712. The bottom end of the lead screw 713 is rotatably connected to the bottom of the shaping plate through a bearing to ensure stable rotation of the lead screw 713. A toothed rack 714 is fixed on the inner side of the shaping plate. A vertical guide groove 715 is opened on the plate surface. A guide block 716 is slidably assembled inside the guide groove 715. A driven toothed disk 717 is rotatably assembled on the outer side of the guide block 716. A shaping roller 718 is rotatably assembled between the two sets of driven toothed disks 717. The lead screw 713 and the shaping roller 718 are staggered to avoid motion interference.

[0027] In this embodiment, the front shaping plate 710 and the rear shaping plate 711 are symmetrically arranged, and the electrode tabs are located between the two upper clamping plates 708, the two shaping rollers 718 and the two lower clamping plates 709. Specifically, during operation, the electrode tab passes through the upper clamping plate 708 and the lower clamping plate 709, and the front and rear shaping rollers 718. The shaping servo motor 712 drives the lead screw 713 to rotate, which drives the guide block 716 to slide vertically along the guide groove 715. In conjunction with the tooth row 714 and the driven tooth plate 717, the shaping rollers 718 are driven to roll and squeeze the electrode tab, which precisely flattens and shapes the wrinkled and bent electrode tab, completely solving the problems of welding defects and misalignment caused by electrode tab deformation, and ensuring that the electrode tab welding surface is flat and regular.

[0028] In this embodiment, the welding structure 800 includes a welding frame 801 fixed on the stepped platform 103. An X-axis electric rod 802 is installed on the welding frame 801. A vertical frame 803 is fixed on the X-axis electric rod 802. A Z-axis electric rod 804 is installed on the vertical frame 803. A vertical slider 805 is fixed on the Z-axis electric rod 804 and is slidably connected to the vertical frame 803. A horizontal frame 806 is fixed to the side of the vertical slider 805. A Y-axis electric rod 807 is installed on the horizontal frame 806. A horizontal slider 808 is fixed on the Y-axis electric rod 807 and is slidably connected to the horizontal frame 806. A laser welding head 809 is also installed on the horizontal slider 808 and is located between the top end of the cap fixture 501 and the bottom end of the shaping frame 705. Specifically, the welding structure 800 enables precise welding in three-dimensional space, including a welding frame 801 fixed on the stepped platform 103. The welding frame 801 is a fixed support to ensure the stability of the welding operation. The welding frame 801 is horizontally fixed with an X-axis electric rod 802. The sliding end of the X-axis electric rod 802 is fixed with a vertical frame 803, which can drive the vertical frame 803 to complete the horizontal displacement adjustment of the X-axis. The vertical frame 803 is vertically fixed with a Z-axis electric rod 804. The sliding end of the Z-axis electric rod 804 is fixed with a vertical slider 805. The vertical slider 805 slides and adapts to the vertical frame 803 to realize the vertical height adjustment of the Z-axis.

[0029] In this embodiment, the X-axis electric rod 802, the Y-axis electric rod 807, and the Z-axis electric rod 804 form an X-axis, Y-axis, and Z-axis coordinate system; Specifically, the X-axis electric rod 802, Y-axis electric rod 807, and Z-axis electric rod 804 work together to construct a complete three-dimensional adjustment coordinate system, which can realize all-round, high-precision fine-tuning of the welding head. The bottom of the horizontal slider 808 fixes the laser welding head 809. The laser welding head 809 is precisely positioned between the top of the cap fixture 501 and the bottom of the shaping frame 705 at the alignment welding station, which can accurately align the fit position of the cap and the electrode ear to complete the high-precision laser welding operation.

[0030] In this embodiment, the control unit structure 900 is electrically connected to the electric drive control equipment on the base 100, the cell conveying structure 300, the cap conveying structure 500, the tab conveying structure 700, and the welding structure 800, respectively. Specifically, the control unit structure 900 adopts a programmable PLC control system, which is electrically connected to the conveying drive component of the base 100, the servo motor and lifting component of the cell conveying structure 300, the servo drive component of the cap conveying structure 500, the clamping and shaping component of the electrode conveying structure 700, and the three-dimensional adjustment and welding component of the welding structure 800. It can uniformly control the start and stop, running speed, working stroke, and welding parameters of each component to realize the automated collaborative operation of the whole machine. At the same time, it has the functions of fault alarm, parameter storage, and constant parameters for batch production to ensure product production consistency.

[0031] The working principle and usage process of this invention: This device relies on a layered, heterogeneous three-turntable layout, combined with the core logic of multi-station synchronous operation, adaptive precise positioning, tab pre-shaping, and three-dimensional precise welding, to achieve fully automated operation of welding and assembling cylindrical lithium battery caps and tabs. The overall process is divided into five core processes: automatic cell loading and positioning, automatic cap conveying and clamping, automatic tab loading and shaping, precise alignment laser welding, and automatic finished product unloading. The entire process is coordinated and controlled by the control unit structure 900, with seamless connection and synchronous operation of each process, as detailed below: Automatic cell feeding and positioning: After the equipment starts, the control unit structure 900 triggers the standby operation of the whole machine. The cell feeding conveyor belt 101 continuously conveys the cylindrical cell body 306 to be processed. When the cell is conveyed to the designated feeding position, the feeding electric rod 102 extends and pushes the cell body 306 smoothly from the side opening 304 into the slot 305 of the cell fixture 303 through the arc-shaped push block at the end. Then, the cell conversion servo motor 301 starts, driving the cell to change position. The turntable 302 rotates, switching the battery cell fixture 303 that loads the battery cell body 306. The side opening 304 on the unloaded battery cell fixture 303 is aligned with the battery cell feeding conveyor belt 101. The feeding electric rod 102 extends and pushes the battery cell body 306 into the battery cell fixture 303 again. After three battery cell fixtures 303 are loaded with battery cell bodies 306, the battery cell conveying turntable 200 rotates so that the next set of three battery cell fixtures 303 can continue to load battery cell bodies 306. Automatic cap feeding and clamping: Simultaneously with the feeding of the battery cell body 306, the cap vibratory feeder 104 starts working, automatically sorting and orienting the disorderly stacked cap bodies 515. These are then synchronously transported to the corresponding cap fixture 501 via three sets of linear vibratory tracks. Subsequently, the lower servo motor 503 starts first, driving the lower rotating ring 506 to rotate through the meshing transmission between the cap gear plate 504 and the rack 507. The eccentric arc groove 508 rotates with the rotating ring, pressing the sliding pin 511 and causing the lower push-pull rod 510 to extend radially, causing the lower limit support plate 513 to extend from the lower support plate groove 514, supporting and holding the cap upwards. The bottom of the cap body 515 is clamped, and then the upper servo motor 502 is started. As mentioned above, the upper limit plate 512 extends out from the upper plate groove 514, presses down and clamps the top of the cap body 515, and achieves precise calibration of the cap posture through servo fine adjustment to ensure that the cap end face is horizontal and the position is centered, thus completing the precise fixing of the cap. Then the cap conveying turntable 400 rotates to transport the calibrated cap to the welding station, where it is aligned with the lower cell body 306 and the upper electrode. The next set of three unloaded cap fixtures 501 are aligned with the three sets of linear vibration tracks again and the cap is fed. Automatic tab feeding and shaping: The tab conveyor turntable 600 operates synchronously, and the external tab unloading rack conveys the tab material into the shaping frame 705. The upper clamping electric rod 706 and the lower clamping electric rod 707 are activated, driving the upper clamping plate 708 and the lower clamping plate 709 to clamp the upper and lower ends of the tab, completing the initial fixing of the tab. Subsequently, the shaping servo motor 712 drives the lead screw 713 to rotate, driving the guide block 716 to move vertically along the guide groove 715. At the same time, the gear row 714 drives the driven gear plate 717 to rotate. The movement drives the shaping roller 718 to roll, causing the two shaping rollers 718 on both sides of the electrode tab to rotate synchronously, performing all-round leveling and shaping operations on the electrode tab surface, completely eliminating electrode tab wrinkles, bending, and deformation defects, and ensuring that the electrode tab welding surface is flat and smooth. After the shaping is completed, the electrode tab conversion servo motor 701 meshes with the toothed ring 704 through the electrode tab toothed disc 702, driving the electrode tab turntable 703 to rotate precisely, and transporting the qualified electrode tab to the welding station, where it is precisely aligned and fitted with the cap body 515 below. Precision alignment laser welding: Once the cell body 306, cap body 515, and electrode tabs are all aligned, the welding structure 800 starts operation. The control unit structure 900, according to preset parameters, controls the operation of the X-axis electric rod 802, Y-axis electric rod 807, and Z-axis electric rod 804, driving the laser welding head 809 to precisely adjust its position in three-dimensional space. This ensures that the laser welding head 809 is precisely aligned with the welding area where the cap and electrode tabs fit together. After the position is calibrated, the laser welding head 809 emits a laser to complete the high-precision laser welding of the cap and electrode tabs. The three-dimensional adjustable welding structure 800 can adapt to the welding requirements of batteries of different specifications. At the same time, it can accurately correct minor alignment deviations of materials, completely avoiding problems such as incomplete welding, missed welding, misaligned welding, and uneven welding stress, thereby improving welding strength and welding consistency. Automatic unloading of finished products: After welding is completed, the lifting rod 307 drives the push plate 308 to move upward, and the push plate 308 drives the cell body 306 to move upward, pushing the top of the cell body 306 into the cap body 515. The cap body 515 is then assembled with the welded cap and electrode tab. During this process, the trapezoidal slider 310 is located inside the inclined groove 309 and does not contact the cap body 515. After the cell body 306, cap, and electrode tab are assembled, the clamping and shaping components are sequentially reset and released. The lifting rod 307 drives the push plate 308 to move downward, and the cell body... The cell body 306 continues to fall into the slot 305 of the cell fixture 303, and the cap body 515 disengages from the cap fixture 501, the electrode tab disengages from the upper clamping plate 708 and the lower clamping plate 709. The cell conveying turntable 200 rotates, conveying the welded and assembled finished battery to the unloading station. The side opening 304 of the cell fixture 303, which contains the assembled cell body 306, cap, and electrode tab, is aligned with the unloading conveyor belt 105. Subsequently, the lifting rod 307 inside the cell fixture 303 lifts the push plate 308, pushing the finished cell body 306 from the slot 305 to the port of the side opening 304. Figure 5 As shown, at this time, the trapezoidal slider 310 pushes the battery cell body 306 outward from one side, pushing the battery cell body 306 from the battery cell fixture 303 onto the unloading conveyor belt 105. The unloading conveyor belt 105 completes the automatic unloading of finished products. After completion, the lifting rod 307 drives the push plate 308 to move down, and the spring 313 extends to push the trapezoidal slider 310 into the inclined groove 309 again, so as to avoid affecting the next unprocessed battery cell body 306 entering the battery cell fixture 303. At the same time, each turntable continues to rotate in a cycle, and the unloaded fixture quickly resets, entering the next round of loading, shaping, welding, and unloading cycle operation, realizing uninterrupted batch automated production.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic welding and assembly device for cylindrical lithium battery caps and tabs, comprising a base (100), characterized in that: A cell conveying turntable (200) is provided on the base (100), and a cell conveying structure (300) is provided on the cell conveying turntable (200). A cap conveying turntable (400) is provided diagonally above the cell conveying turntable (200), and a cap conveying structure (500) is provided on the cap conveying turntable (400). An electrode conveying turntable (600) is provided diagonally above the cap conveying turntable (400), and an electrode conveying structure (700) is provided on the electrode conveying turntable (600). A welding structure (800) is also provided between the cap conveying structure (500) and the electrode conveying structure (700). A control unit structure (900) is installed on the side of the base (100). The base (100) includes a cell feeding conveyor belt (101), a feeding electric rod (102), a stepped platform (103), a cap vibrating plate (104), and a discharge conveyor belt (105). The cell feeding conveyor belt (101) and the discharge conveyor belt (105) are respectively located at the loading end and the unloading end of the cell conveying turntable (200). The feeding electric rod (102) is located next to the cell feeding conveyor belt (101), and an arc-shaped push block is installed on the piston end. The stepped platform (103) is fixed on the base (100), and the cap vibrating plate (104) is installed on... On the stepped platform (103), and the straight track port on the cap vibrating plate (104) is aligned with the cap conveying structure (500), a motor is installed on the base (100), and the output end is fixedly connected to the cell conveying turntable (200). Two motors are installed on the stepped platform (103), and the output ends of the two motors are fixedly connected to the cap conveying turntable (400) and the tab conveying turntable (600) respectively. The cell conveying turntable (200), the cap conveying turntable (400) and the tab conveying turntable (600) are set from low to high and have different centers.

2. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 1, characterized in that, The cell conveying structure (300) includes a cell conversion servo motor (301) installed at the bottom of the cell conveying turntable (200). The output end of the cell conversion servo motor (301) is fixed with a cell transfer turntable (302), and the cell transfer turntable (302) is rotatably connected to the cell conveying turntable (200). Six cell transfer turntables (302) are equidistantly arranged along the circumference of the cell conveying turntable (200). Three cell fixtures (303) are equidistantly arranged along the circumference of the cell transfer turntable (302). A side opening (304) is provided on the side of the cell fixture (303). A slot (305) is provided inside the cell fixture (303), and the side opening (304) communicates with the slot (305). The depth of the slot (305) is greater than the depth of the side opening (304). The slot (305) is movable inside. A battery cell body (306) is movably inserted. A lifting rod (307) is also installed inside the battery cell fixture (303). A push plate (308) is fixed at the top of the lifting rod (307). The push plate (308) is axially slidably connected to the slot (305). An inclined groove (309) is opened on the inner wall of the slot (305). The inclined groove (309) is located opposite to the side opening (304). A trapezoidal slider (310) slides inside the inclined groove (309). A rectangular slide groove (311) is opened on the push plate (308). A rectangular slider (312) slides inside the rectangular slide groove (311). A spring piece (313) is fixed between the side of the rectangular slider (312) and the inner wall of the rectangular slide groove (311). A connecting rod (314) is fixed between the rectangular slider (312) and the trapezoidal slider (310).

3. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 2, characterized in that, The inclined surface on one side of the trapezoidal slider (310) is adapted to the inclined surface on the inclined groove (309), and the other side of the trapezoidal slider (310) is in contact with the battery cell body (306).

4. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 2, characterized in that, The cap conveying structure (500) includes cap fixtures (501) fixed on the cap conveying turntable (400). Three sets of cap fixtures (501) are equidistantly arranged along the circumference of the cap conveying turntable (400), with three cap fixtures (501) in each set. Each set of three cap fixtures (501) is aligned with three linear vibrating track outlets on the cap vibrating plate (104). An upper servo motor (502) and a lower servo motor (502) are respectively mounted above and below the surface of the cap fixture (501) via brackets. The lower servo motor (503) and the output ends of the upper servo motor (502) and the lower servo motor (503) are both fixed with cap gear disks (504). The upper rotating ring (505) and the lower rotating ring (506) are respectively rotated above and below the surface of the cap fixture (501) via bearings. The surfaces of the upper rotating ring (505) and the lower rotating ring (506) are both fixed with racks (507), and the racks (507) mesh with the cap gear disks (504). The upper rotating ring (505) and the lower rotating ring (506) The end faces of the cap fixture (501) are provided with arc-shaped grooves (508), and the arc-shaped grooves (508) are not concentric with the upper rotating ring (505) and the lower rotating ring (506). The upper push-pull rod (509) and the lower push-pull rod (510) are radially slidable above and below the surface of the cap fixture (501), respectively. The outer ends of the upper push-pull rod (509) and the lower push-pull rod (510) are fixed with sliding pins (511), and the sliding pins (511) are slidably connected to the arc-shaped grooves (508). The inner end of the upper push-pull rod (509) is also provided with an arc-shaped groove (508). An upper limit plate (512) is fixed inside the cap fixture (501), and a lower limit plate (513) is fixed inside the cap fixture (501) at one end of the lower push-pull rod (510). The cap fixture (501) has a plate groove (514) on the upper and lower sides of its inner wall, and the plate groove (514) is adapted to the upper limit plate (512) and the lower limit plate (513) respectively. The cap fixture (501) has a cap body (515) inside.

5. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 4, characterized in that, The upper limit plate (512) and the lower limit plate (513) are symmetrically arranged, and the cap body (515) is adapted to the upper limit plate (512) and the lower limit plate (513).

6. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 4, characterized in that, The electrode conveying structure (700) includes an electrode conversion servo motor (701) mounted on an electrode conveying turntable (600). An electrode gear disk (702) is fixed to the output end of the electrode conversion servo motor (701). Three electrode turntables (703) are equidistantly arranged circumferentially on the electrode conveying turntable (600). A toothed ring (704) is fixed to the surface of each electrode turntable (703), and the toothed ring (704) meshes with the electrode gear disk (702). Three electrode gears are fixed to each electrode turntable (703). A shaping frame (705) has three ports aligned with the three outlets of the external electrode unloading rack. An upper clamping electric rod (706) and a lower clamping electric rod (707) are fixed above and below the shaping frame (705), respectively. An upper clamping plate (708) is fixed to the upper clamping electric rod (706), and a lower clamping plate (709) is fixed to the lower clamping electric rod (707). A front shaping plate (710) is fixed to the front end of the shaping frame (705), and a rear shaping plate (711) is fixed to the rear end. The front shaping plate (710) and the rear shaping plate (711) are located between the upper clamping plate (708) and the lower clamping plate (709). A shaping servo motor (712) is installed at the top of both the front shaping plate (710) and the rear shaping plate (711). A lead screw (713) is fixed to the output end of the shaping servo motor (712), and the bottom end of the lead screw (713) is rotatably connected to the bottom of the front shaping plate (710) and the rear shaping plate (711) via a bearing. The sides of both the front shaping plate (710) and the rear shaping plate (711) are fixed with… The toothed rack (714) has guide grooves (715) on both the front shaping plate (710) and the rear shaping plate (711). A guide block (716) slides inside the guide groove (715). A driven toothed disc (717) rotates on the outside of the guide block (716). A shaping roller (718) rotates between the two driven toothed discs (717). Both ends of the shaping roller (718) pass through the guide block (716) and are fixedly connected to the driven toothed disc (717). The lead screw (713) is staggered from the shaping roller (718).

7. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 6, characterized in that, The front shaping plate (710) and the rear shaping plate (711) are symmetrically arranged, and the electrode tabs are located between the two upper clamping plates (708), the two shaping rollers (718) and the two lower clamping plates (709).

8. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 6, characterized in that, The welding structure (800) includes a welding frame (801) fixed on a stepped platform (103). An X-axis electric rod (802) is mounted on the welding frame (801). A vertical frame (803) is fixed on the X-axis electric rod (802). A Z-axis electric rod (804) is mounted on the vertical frame (803). A vertical slider (805) is fixed on the Z-axis electric rod (804), and the vertical slider (805) is slidably connected to the vertical frame (803). A transverse frame (806) is fixed to the side of the slider (805). A Y-axis electric rod (807) is installed on the transverse frame (806). A transverse slider (808) is fixed on the Y-axis electric rod (807). The transverse slider (808) is slidably connected to the transverse frame (806). A laser welding head (809) is also installed on the transverse slider (808). The laser welding head (809) is located between the top of the cap fixture (501) and the bottom of the shaping frame (705).

9. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 8, characterized in that, The X-axis electric rod (802), Y-axis electric rod (807), and Z-axis electric rod (804) form the X-axis, Y-axis, and Z-axis coordinate systems.

10. The automatic welding and assembly device for cylindrical lithium battery caps and tabs according to claim 8, characterized in that, The control unit structure (900) is electrically connected to the electric drive control equipment on the base (100), the cell delivery structure (300), the cap delivery structure (500), the tab delivery structure (700), and the welding structure (800).

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