An unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets

Abstract

This invention discloses an unwinding mechanism for high-speed cutting of lithium battery electrodes, comprising a frame and a servo unwinding module, a two-stage closed-loop correction module, a tension control and buffering module, an automatic tape splicing and tab imprinting module, and a vision and control module mounted on the frame along the electrode's forward direction. This unwinding mechanism uses the frame as its mounting base, highly integrating functions such as servo unwinding, two-stage closed-loop correction, tension control and buffering, automatic tape splicing and tab imprinting, vision assistance, and centralized control onto the frame. The structure is compact and rationally laid out, eliminating the need for additional independent equipment, thus improving the overall processing efficiency of the production line and reducing equipment investment and maintenance costs. Simultaneously, the vision and control module enables centralized control of the entire process, with each module working collaboratively to ensure the stability, accuracy, and continuity of the electrode during high-speed transmission, adapting to the production requirements of high-speed cutting of lithium battery electrodes.

Description

Technical Field

[0001] This invention relates to the field of lithium battery electrode equipment technology, specifically to an unwinding mechanism for high-speed cutting and production of lithium battery electrodes. Background Technology

[0002] In the lithium battery electrode cutting process, unwinding is the first and most crucial step. The stability of the unwinding process, the precision of tension control, and the ability to correct electrode strip deviation directly determine the quality of subsequent cutting and the overall production line efficiency. As the lithium battery industry continues to demand higher capacity and quality, high-speed cutting lines have become the mainstream configuration, which places higher demands on the unwinding mechanism.

[0003] Traditional lithium battery electrode unwinding equipment typically suffers from the following drawbacks: First, its functional modules are fragmented, with unwinding, alignment, tension control, and tape splicing units set up independently. This results in a loosely structured equipment, a large footprint, and long transmission paths, which is detrimental to stable operation at high speeds. Second, traditional equipment is often designed for electrodes of specific widths, thicknesses, or materials (such as those specifically for positive or negative electrodes), lacking versatility. Adjustments are cumbersome when changing product specifications, affecting production flexibility. Third, tension control often employs mechanical or pneumatic passive methods, resulting in slow response and large fluctuations. During high-speed start-ups, shutdowns, or tape changes, this can easily cause electrode stretching, wrinkling, or even tape breakage. Furthermore, the alignment module lacks precision and intuitive tape position indicators, making operation and maintenance reliant on experience, inefficient, and prone to errors. Summary of the Invention

[0004] To overcome the shortcomings of existing technical solutions, this invention provides an unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets. This mechanism highly integrates functions such as servo unwinding, dual-stage closed-loop correction, tension control and buffering, automatic tape splicing and electrode tab imprinting, vision assistance and centralized control on the frame. It aims to solve the problems of large footprint, poor coordination, low roll changing efficiency and insufficient versatility of traditional equipment, and realize high-speed, high-precision and high-stability electrode sheet unwinding operations.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] An unwinding mechanism for high-speed cutting and production of lithium battery electrodes includes a frame and a component mounted on the frame along the electrode's forward direction.

[0007] The servo unwinding module is used to carry and drive the rotation of the electrode roll, and to realize the precise start and stop and stepless speed regulation of the electrode roll;

[0008] A dual-stage closed-loop correction module is provided, which is located downstream of the servo unwinding module, and is used to detect and correct the lateral position offset during the electrode transfer process in real time.

[0009] The tension control and buffer module is used to apply and maintain a constant tension on the electrode during unwinding and to provide buffer tension when switching between old and new rolls.

[0010] The automatic splicing and tab imprinting module is used to enable rapid splicing between new and old rolls and to perform multi-process imprinting on the tabs on the electrode sheets.

[0011] The vision and control module is used to visually detect the deviation of the electrode sheet and to centrally operate and control the servo unwinding module, the two-stage closed-loop correction module, the tension control and buffering module, and the automatic tape splicing and tab imprinting module.

[0012] Preferably, the servo unwinding module includes an unwinding mounting base mounted on the frame, a sliding plate mounted above the unwinding mounting base, a servo motor mounted on the sliding plate, a reducer connected to the output shaft of the servo motor, an input shaft of the reducer connected to the output shaft of the servo motor, and a servo unwinding air shaft mounted on one side of the frame connected to the output shaft of the reducer via a coupling. The servo unwinding air shaft is used to install and clamp lithium battery positive or negative electrode rolls of different inner diameters. The servo motor drives the servo unwinding air shaft to achieve precise stepless speed regulation and rapid start-stop of positive or negative electrode rolls of different diameters and materials.

[0013] Preferably, the two-stage closed-loop correction module includes:

[0014] An unwinding and correction component is connected to the servo unwinding module and is used to drive the servo unwinding module to move laterally as a whole to perform initial correction on the electrode sheet.

[0015] A process correction component is disposed downstream of the unwinding correction component and is used to perform a second position correction on the electrode sheet after the initial correction.

[0016] At least one unwinding correction sensor is provided, which is used to detect the electrode edge position signal in real time and feed it back to the unwinding correction component and the process correction component to realize closed-loop correction control of the electrode.

[0017] Preferably, the unwinding correction assembly includes a ball screw drive pair mounted on the unwinding mounting base, a linear guide pair slidably connected to the sliding plate, and an unwinding correction driven roller mounted on one side of the frame;

[0018] The ball screw drive pair includes a drive motor mounted on the unwinding mounting base, a ball screw connected to the output shaft of the drive motor, and a connecting plate threaded to the ball screw. The connecting plate is fixedly connected to the sliding plate, and the sliding plate is fixedly connected to a first connecting plate. The first connecting plate is fixedly connected to a second connecting plate connected to the unwinding correction driven roller.

[0019] Preferably, the process correction assembly includes a process correction frame mounted on the frame, a process correction roller for the roll material to pass through and a process correction actuator for pushing the process correction roller to swing or translate, the process correction actuator controlling the movement of the process correction roller according to the feedback data of the unwinding correction sensor to achieve process correction; the process correction assembly also includes a process correction transition roller rotatably mounted on the frame.

[0020] Preferably, the tension control and buffering module includes a tension control component for achieving constant tension transmission of the electrode sheet and a tension buffering component for providing buffering during roll changing;

[0021] The tension control assembly includes a tension swing arm rotatably mounted on the frame, a tension swing arm roller mounted on the tension swing arm, a tension control cylinder connected to the tension swing arm for providing or adjusting tension, and a tension angle encoder for detecting the rotation angle of the tension swing arm. The tension control cylinder drives the tension swing arm roller to drive and cause the tension swing arm to swing according to the feedback signal of the tension angle encoder to adjust the tension of the traction electrode.

[0022] The tension buffer assembly includes a linearly movable tension buffer roller module mounted on the frame and a tension buffer roller mounted on the tension buffer roller module for providing tension buffering during roll changing and splicing. The tension buffer roller linear module drives the tension buffer roller to move during roll changing to provide buffered tension.

[0023] Preferably, the tension control assembly further includes an upper tension transition roller and a lower tension transition roller rotatably mounted on the frame, wherein the upper tension transition roller, the lower tension transition roller, and the tension swing arm roller together form a path for the electrode to form a stable wrap angle.

[0024] Preferably, the automatic tape splicing and tab imprinting module includes an automatic tape splicing component for quickly splicing new and old rolls of material and a tab imprinting component for performing multi-process imprinting on the tabs.

[0025] The automatic tape splicing assembly includes a tape splicing platform connected to the frame. The inlet and outlet sides of the tape splicing platform are respectively provided with a pre-splicing transition roller and a post-splicing transition roller for guiding the electrode roll material to enter and leave smoothly. A tape splicing detection sensor for detecting the tape splicing position is provided above the tape splicing platform.

[0026] The tab imprinting assembly includes a tab imprinting mounting plate connected to the frame, a tab cylinder mounted on the tab imprinting mounting plate, an tab imprinting module connected to the output shaft of the tab cylinder, and a tab imprinting roller that cooperates with the tab imprinting module to imprint the electrode sheet on one side.

[0027] Preferably, the vision and control module includes multiple sets of electrode deviation visible lasers connected to the frame. The multiple sets of electrode deviation visible lasers are respectively set at key positions on the electrode roll conveying path and are used to display the offset position of the electrode roll in real time.

[0028] Preferably, the vision and control module further includes a control panel for parameter setting, status display and centralized control, and the control panel is electrically connected to the servo unwinding module, the two-stage closed-loop correction module, the tension control and buffer module and the automatic tape splicing and tab imprinting module.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets of the present invention has at least one of the following beneficial effects during use:

[0031] The unwinding mechanism for high-speed cutting of lithium battery electrode sheets provided by this invention uses a frame as its mounting base. It highly integrates functions such as servo unwinding, dual-stage closed-loop correction, tension control and buffering, automatic tape splicing and electrode tab imprinting, vision assistance, and centralized control onto the frame. The structure is compact and rationally laid out, eliminating the need for additional independent equipment, thus improving the overall processing efficiency of the production line and reducing equipment investment and maintenance costs. Simultaneously, it is equipped with vision and control modules to achieve centralized management of the entire process. The modules work collaboratively to ensure the stability, accuracy, and continuity of the electrode sheets during high-speed transmission, adapting to the production requirements of high-speed cutting of lithium battery electrode sheets. The servo unwinding module possesses extremely high rotational speed accuracy and dynamic response characteristics, ensuring the stability of the unwinding speed and providing a stable material supply foundation for subsequent processes. Furthermore, the servo unwinding air shaft allows for adaptation to various specifications of cores through simple inflation and deflation operations, eliminating the need to replace mechanical parts, significantly improving the equipment's compatibility with different electrode models, and reducing costs. The system reduces changeover preparation time. The dual-stage closed-loop correction module's two-stage correction structure forms a closed-loop control circuit, automating and intelligently controlling the correction action without manual intervention. It offers fast response, adapts to high-speed electrode transport, ensures stability during long-term continuous production, and guarantees the timeliness and accuracy of the correction action. The tension control and buffer module provides precise and stable closed-loop constant tension control, compensating in real-time for tension fluctuations caused by changes in roll diameter during unwinding. This prevents electrode deformation due to excessive tension or wrinkling due to insufficient tension, ensuring electrode quality. The automatic tape splicing and tab imprinting module replaces manual tape splicing, significantly shortening changeover time. Furthermore, the integrated design of the tab imprinting and tape splicing processes reduces process connections, eliminating the need for additional imprinting equipment and saving equipment space and investment costs. The vision and control module enables full-process monitoring and centralized control, reducing manual intervention costs and improving the overall efficiency and quality of lithium battery electrode unwinding and transport. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets provided in an embodiment of the present invention;

[0033] Figure 2 A perspective view of an unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets provided in an embodiment of the present invention;

[0034] Figure 3 Another perspective view of the unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets provided in an embodiment of the present invention;

[0035] Figure 4 for Figure 3 Enlarged view of point A in the image;

[0036] Figure 5This is another perspective view of the unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets provided in an embodiment of the present invention.

[0037] Numbering on the map:

[0038] 1. Rack;

[0039] 2. Servo unwinding module; 21. Unwinding mounting base; 22. Sliding plate; 23. Servo motor; 24. Reducer; 25. Servo unwinding air shaft;

[0040] 3. Two-stage closed-loop correction module; 31. Unwinding correction assembly; 311. Ball screw drive pair; 3110. Drive motor; 3111. Ball screw; 3112. Connecting plate; 312. Linear guide pair; 313. Unwinding correction driven roller; 314. First connecting plate; 315. Second connecting plate; 32. Process correction assembly; 321. Process correction frame; 322. Process correction roller; 323. Process correction actuator; 324. Process correction transition roller; 33. Unwinding correction sensor;

[0041] 4. Tension control and buffer module; 41. Tension control assembly; 411. Tension swing arm; 412. Tension swing arm roller; 413. Tension control cylinder; 414. Tension angle encoder; 415. Upper tension transition roller; 416. Lower tension transition roller; 42. Tension buffer assembly; 421. Tension buffer roller linear module; 422. Tension buffer roller;

[0042] 5. Automatic tape splicing and tab imprinting module; 51. Automatic tape splicing assembly; 511. Tape splicing platform; 512. Pre-splicing transition roller; 513. Post-splicing transition roller; 514. Tape splicing detection sensor; 52. Tab imprinting assembly; 521. Tab imprinting mounting plate; 522. Tab cylinder; 523. Tab imprinting module; 524. Tab imprinting roller;

[0043] 6. Vision and control module; 61. Polarization laser; 62. Control panel. Detailed Implementation

[0044] 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.

[0045] This invention provides an unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets, with reference to... Figure 1-5The system includes a frame 1 and a servo unwinding module 2, a two-stage closed-loop correction module 3, a tension control and buffer module 4, an automatic tape splicing and tab imprinting module 5, and a vision and control module 6 mounted on the frame 1 along the electrode sheet forward direction. Specifically, the unwinding mechanism of the present invention uses the frame 1 as the mounting base, highly integrating functions such as servo unwinding, two-stage closed-loop correction, tension control and buffering, automatic tape splicing and tab imprinting, vision assistance and centralized control on the frame 1. The structure is compact and the layout is reasonable, eliminating the need for additional independent equipment, improving the overall processing efficiency of the production line, and reducing equipment investment and maintenance costs. Among them, the servo unwinding module 2 carries the electrode sheet roll material and realizes precise start and stop and stepless speed adjustment of the roll material through servo drive, providing stable unwinding power for high-speed cutting; the two-stage closed-loop correction module 3 is mounted on the servo frame 1 along the electrode sheet forward direction. The downstream unwinding module 2 detects the lateral position of the electrode sheet in real time and corrects the offset in a timely manner; the tension control and buffer module 4 maintains constant tension on the electrode sheet throughout the unwinding process and provides buffer tension during the transition between old and new rolls to prevent the electrode sheet from breaking or wrinkling due to sudden tension changes; the automatic splicing and electrode tab imprinting module 5 completes the rapid splicing of old and new rolls and performs multi-process imprinting on the electrode tab area; the vision and control module 6 monitors the electrode sheet deviation status in real time through visual detection and performs centralized operation and linkage control of the other four modules to ensure the automation and precision of the entire unwinding process.

[0046] In an embodiment of the present invention, the servo unwinding module 2 is used to carry and drive the rotation of the electrode roll, and to realize precise start-stop and stepless speed regulation of the electrode roll. The servo unwinding module 2 includes an unwinding mounting base 21 mounted on the frame 1. A sliding plate 22 is mounted above the unwinding mounting base 21. A servo motor 23 is mounted on the sliding plate 22. The output shaft of the servo motor 23 is connected to a reducer 24. The input shaft of the reducer 24 is connected to the output shaft of the servo motor 23. The output shaft of the reducer 24 is connected to a servo unwinding air shaft 25 mounted on one side of the frame 1 via a coupling. The servo unwinding air shaft 25 is used to install and clamp electrode rolls of lithium battery positive or negative electrodes with different inner diameters. The servo motor 23 drives the servo unwinding air shaft 25 to realize precise stepless speed regulation and rapid start-stop of positive or negative electrode rolls with different roll diameters and materials. Specifically, the servo unwinding module 2 drives the reducer 24 via the servo motor 23, which in turn drives the servo unwinding air shaft 25 to rotate via a coupling, thereby realizing the unwinding action of the electrode roll. The friction strip inside the servo unwinding air shaft 25 expands radially under the action of compressed air, forming a reliable frictional connection with the inner wall of the roll core, thus realizing universal clamping of lithium battery positive and negative electrode rolls with different inner diameters. The servo driver of the servo motor 23 precisely controls the speed of the servo motor 23 according to the speed or torque command issued by the main controller, realizing the start and stop, stepless speed regulation and position control of the unwinding shaft. Especially when changing rolls, the servo unwinding air shaft 25 can be controlled to stop precisely at a fixed angle position that is convenient for splicing. The servo unwinding module 2 of this invention has extremely high rotational speed accuracy and dynamic response characteristics, ensuring the stability of the unwinding speed and providing a stable material supply foundation for subsequent processes. Furthermore, by adopting the servo unwinding air shaft 25, it can adapt to various specifications of cores through simple inflation and deflation operations without replacing mechanical parts, significantly improving the equipment's compatibility with different types of electrode sheets and reducing changeover preparation time. In addition, the servo motor 23 can regenerate energy under light load or braking, which is more energy-efficient than traditional motor drives, and its rapid start-stop capability also shortens the production cycle.

[0047] In an embodiment of the present invention, the dual-stage closed-loop correction module 3 is disposed downstream of the servo unwinding module 2 and is used to detect and correct the lateral position offset during the electrode transfer process in real time. The dual-stage closed-loop correction module 3 includes an unwinding correction component 31, a process correction component 32, and at least one unwinding correction sensor 33. The unwinding correction component 31 is connected to the servo unwinding module 2 and is used to drive the servo unwinding module 2 to move laterally as a whole to perform initial correction on the electrode. The process correction component 32 is disposed downstream of the unwinding correction component 31 and is used to perform a second position correction on the electrode after the initial correction. The unwinding correction sensor 33 is used to detect the edge position signal of the electrode in real time and feed it back to the unwinding correction component 31 and the process correction component 32 to realize closed-loop correction control of the electrode. Specifically, the dual-stage closed-loop correction module 3 adopts a dual-stage correction structure of unwinding correction + process correction, and realizes closed-loop control through the unwinding correction sensor 33: the unwinding correction component 31 is directly connected to the servo unwinding module 2, and drives the servo unwinding module 2 to move laterally as a whole to perform initial correction on the electrode sheet from the unwinding source, eliminating the positional deviation of the roll material itself; the process correction component 32 performs secondary position correction on the electrode sheet after the initial correction downstream of the unwinding correction component 31, further improving the transmission accuracy of the electrode sheet; the unwinding correction sensor 33 collects the edge position signal of the electrode sheet in real time and feeds the signal back to the unwinding correction component 31 and the process correction component 32 to form a closed-loop control loop. The closed-loop control mode realizes the automation and intelligence of the correction action, without manual intervention, with fast response speed, adapting to the working conditions of high-speed transmission of the electrode sheet, ensuring the stability of long-term continuous production, and ensuring the timeliness and accuracy of the correction action.

[0048] In this embodiment, the unwinding and correction assembly 31 includes a ball screw drive pair 311 mounted on the unwinding mounting base 21, a linear guide pair 312 slidably connected to the sliding plate 22, and an unwinding and correction driven roller 313 mounted on one side of the frame 1. The ball screw drive pair 311 includes a drive motor 3110 mounted on the unwinding mounting base 21, a ball screw 3111 connected to the output shaft of the drive motor 3110, and a connecting plate 3112 threadedly connected to the ball screw 3111. The connecting plate 3112 is fixedly connected to the sliding plate 22, and the sliding plate 22 is fixedly connected to a first connecting plate 314. The first connecting plate 314 is fixedly connected to a second connecting plate 315 connected to the unwinding and correction driven roller 313. Specifically, the unwinding and correction assembly 31 uses the ball screw drive pair 311 as its power core and the linear guide pair 312 as its guiding mechanism: after the drive motor 3110 starts, it drives the ball screw 3111 to rotate. Through the threaded engagement between the ball screw 3111 and the connecting plate 3112, the rotational motion is converted into the linear motion of the connecting plate 3112. The connecting plate 3112 is fixedly connected to the sliding plate 22, thereby driving the sliding plate 22 and the servo unwinding module 2 mounted thereon to move laterally along the linear guide pair 312 to achieve initial correction. At the same time, the unwinding and correction driven roller 313, which is connected to the sliding plate 22 through the connecting plate 3112, moves synchronously with the servo unwinding module 2 to assist in the smooth delivery of the electrode sheet and avoid damage caused by relative sliding between the electrode sheet and the roller body during the correction process. The unwinding and correction assembly 31 of the present invention, through the transmission and guiding combination of the ball screw drive pair 311 and the linear guide pair 312, has high transmission accuracy and low frictional resistance, enabling the servo unwinding module 2 to move smoothly and accurately laterally, with no jamming in the correction action and fast response speed; and the unwinding and correction driven roller 313 moves in linkage with the servo unwinding module 2 to ensure the fit between the electrode sheet and the roller body during the correction process, avoid wrinkles or scratches on the electrode sheet due to correction, and improve the surface quality of the electrode sheet.

[0049] In this embodiment, the process correction assembly 32 includes a process correction frame 321 mounted on the frame 1. The process correction frame 321 is equipped with a process correction roller 322 for the coil material to pass through, and a process correction actuator 323 that drives the process correction roller 322 to swing or translate. The process correction actuator 323 controls the movement of the process correction roller 322 based on feedback data from the unwinding correction sensor 33 to achieve process correction. Specifically, the process correction assembly 32 uses the process correction frame 321 as its mounting carrier. During electrode conveying, the roller passes through the process correction roller 322. The process correction actuator 323 drives the process correction roller 322 to swing or translate based on the electrode position signal fed back by the unwinding correction sensor 33. By changing the electrode conveying path, a secondary position correction is performed on the electrode that has undergone initial correction.

[0050] Furthermore, the process correction assembly 32 also includes a process correction transition roller 324 rotatably mounted on the frame 1. During the electrode conveying process, the process correction transition roller 324 assists in the electrode's rotation and conveying, ensuring that the electrode remains taut throughout the correction process and guaranteeing the stability of the electrode transmission.

[0051] In an embodiment of the present invention, the tension control and buffer module 4 is used to apply and maintain a constant tension on the electrode sheet during unwinding and to provide buffer tension when switching between old and new rolls. The tension control and buffer module 4 includes a tension control component 41 for achieving constant tension transmission of the electrode sheet and a tension buffer component 42 for providing buffering during roll switching. The tension control and buffer module 4 of the present invention can achieve precise and stable closed-loop constant tension control, and can compensate for tension fluctuations caused by changes in the roll diameter during unwinding in real time, avoiding stretching and deformation of the electrode sheet due to excessive tension or loosening and wrinkling due to insufficient tension, thus ensuring the quality of the electrode sheet; and the tension buffer component 42 solves the problem of sudden tension changes during roll switching, achieving a smooth transition in the roll switching process, improving roll switching efficiency, and ensuring continuous operation of the production line.

[0052] Specifically, the tension control assembly 41 includes a tension swing arm 411 rotatably mounted on the frame 1, a tension swing arm roller 412 mounted on the tension swing arm 411, a tension control cylinder 413 connected to the tension swing arm 411 for providing or adjusting tension, and a tension angle encoder 414 for detecting the rotation angle of the tension swing arm 411. The tension control cylinder 413 drives the tension swing arm roller 412 to drive the tension swing arm 411 to swing according to the feedback signal of the tension angle encoder 414, thereby adjusting the tension of the traction electrode. In the tension control assembly 41, the electrode wraps around the tension swing arm roller 412 on the tension swing arm 411. The tension angle encoder 414 detects the rotation angle of the tension swing arm 411 in real time. The change of this angle corresponds to the fluctuation of the electrode tension. The tension control cylinder 413 drives the tension swing arm 411 to swing according to the feedback signal of the tension angle encoder 414. By adjusting the position of the tension swing arm roller 412, the electrode wrap angle and stroke are changed, thereby adjusting the electrode tension and realizing constant tension control.

[0053] Specifically, the tension buffer assembly 42 includes a linearly movable tension buffer roller module 421 mounted on the frame 1 and a tension buffer roller 422 mounted on the tension buffer roller module 421 for providing tension buffering during roll changing and splicing. The tension buffer roller module 421 drives the tension buffer roller 422 to move during roll changing to provide buffered tension. During roll changing and splicing, the tension buffer assembly 42 uses the tension buffer roller module 421 to drive the tension buffer roller 422 to move linearly, changing the electrode buffer length and providing tension buffering during the roll changing process, thus preventing damage to the electrode due to sudden tension changes during roll changing.

[0054] Furthermore, the tension control assembly 41 also includes an upper tension transition roller 415 and a lower tension transition roller 416 rotatably mounted on the frame 1. The upper tension transition roller 415, the lower tension transition roller 416, and the tension swing arm roller 412 together form a path for the electrode to form a stable wrap angle. Based on the tension control assembly 41, an upper tension transition roller 415 and a lower tension transition roller 416 are added. The electrode sheet passes sequentially around the lower tension transition roller 416, the tension swing arm roller 412, and the upper tension transition roller 415, which together form the electrode sheet conveying path. This allows the electrode sheet to form a stable wrap angle at the tension control assembly 41. This wrap angle structure increases the contact area between the electrode sheet and the roller body, improving the sensitivity and stability of tension adjustment. Combined with the swinging motion of the tension swing arm 411, the electrode sheet maintains a constant tension during high-speed unwinding, further ensuring the quality of electrode sheet transmission. Furthermore, the setting of the upper tension transition roller 415 and the lower tension transition roller 416 optimizes the electrode sheet conveying path, avoiding direct contact between the electrode sheet and components such as the tension swing arm 411, which could cause scratches and improve the surface integrity of the electrode sheet.

[0055] In an embodiment of the present invention, the automatic tape splicing and tab imprinting module 5 is used to achieve rapid tape splicing between new and old rolls and to perform multi-process imprinting on the tabs on the electrode sheets. The automatic tape splicing and tab imprinting module 5 includes an automatic tape splicing component 51 for achieving rapid tape splicing between new and old rolls and a tab imprinting component 52 for performing multi-process imprinting on the tabs. The automatic tape splicing function of the automatic tape splicing and tab imprinting module 5 of the present invention replaces manual tape splicing, significantly shortens roll changeover time, improves the automation level and production efficiency of the production line, and reduces labor costs; moreover, the integrated design of the tab imprinting and tape splicing processes reduces process connection links, eliminates the need for additional imprinting equipment, and saves equipment space and investment costs.

[0056] Specifically, the automatic splicing assembly 51 includes a splicing platform 511 connected to the frame 1. The splicing platform 511 has a pre-splicing transition roller 512 and a post-splicing transition roller 513 on its inlet and outlet sides, respectively, for guiding the electrode roll material smoothly into and out of the machine. A splicing detection sensor 514 for detecting the splicing position is disposed above the splicing platform 511. Specifically, the automatic splicing and tab imprinting module 5 of the present invention includes an automatic splicing assembly 51 and a tab imprinting assembly 52. ​​In the automatic splicing assembly 51, the pre-splicing transition roller 512 and the post-splicing transition roller 513 guide the electrode roll material smoothly into and out of the splicing platform 511. The splicing detection sensor 514 detects the docking position of the new and old roll materials in real time, triggering the splicing mechanism to complete rapid splicing.

[0057] Specifically, the tab imprinting assembly 52 includes a tab imprinting mounting plate 521 connected to the frame 1. A tab cylinder 522 is mounted on the tab imprinting mounting plate 521. The output shaft of the tab cylinder 522 is connected to a tab imprinting module 523. A tab imprinting roller 524 is provided on one side of the tab imprinting module 523 to imprint the tab on the electrode sheet. In the tab imprinting assembly 52, the tab cylinder 522 drives the tab imprinting module 523 downward, cooperating with the tab imprinting roller 524 to imprint the tab portion of the electrode sheet, thereby achieving the forming or marking requirements of the tab.

[0058] In an embodiment of the present invention, the vision and control module 6 is used to visually detect the deviation of the electrode sheet and to centrally control the servo unwinding module 2, the dual-stage closed-loop correction module 3, the tension control and buffer module 4, and the automatic tape splicing and tab imprinting module 5. The vision and control module 6 includes multiple sets of electrode sheet deviation visual lasers 61 connected to the frame 1. These lasers are respectively positioned at key locations along the electrode sheet roll conveying path and are used to display the deviation position of the electrode sheet roll in real time. Specifically, the electrode sheet deviation visual lasers 61 in the vision and control module 6 are installed at key locations along the electrode sheet conveying path (such as before and after correction, at the tape splicing station, etc.). The laser beam is projected onto the edge or surface of the electrode sheet, allowing the operator to visually judge the deviation state of the electrode sheet through changes in the position of the laser spot. Simultaneously, the laser detection signal can be fed back to the correction module to improve the accuracy of the correction control.

[0059] Furthermore, the vision and control module 6 also includes a control panel 62 for parameter setting, status display, and centralized control. The control panel 62 is electrically connected to the servo unwinding module 2, the dual-stage closed-loop correction module 3, the tension control and buffer module 4, and the automatic tape splicing and tab imprinting module 5. The addition of the control panel 62 to the vision and control module 6 allows operators to set parameters (such as unwinding speed, correction threshold, tension value, etc.), view the real-time operating status of each module (such as motor speed, correction amount, tension value, etc.), and centrally control and coordinate the operation of each module, ensuring the coordination of the unwinding mechanism and further improving the automation level and production efficiency of the production line.

[0060] The unwinding mechanism for high-speed cutting of lithium battery electrode sheets provided by this invention uses a frame 1 as the core mounting base. Along the electrode sheet forward direction, it sequentially integrates the servo unwinding module 2, the dual-stage closed-loop correction module 3, the tension control and buffer module 4, and the automatic tape splicing and tab imprinting module 5. At the same time, it is equipped with a vision and control module 6 to realize centralized control of the entire process. All modules work together to ensure the stability, accuracy and continuity of the electrode sheet during high-speed transmission, and adapt to the production requirements of high-speed cutting of lithium battery electrode sheets.

[0061] The specific workflow is as follows: Lithium battery positive or negative electrode sheets of different inner diameters are mounted and clamped onto the servo unwinding air shaft 25 of the servo unwinding module 2 to complete the positioning of the roll to be conveyed; the servo unwinding air shaft 25 is mounted on one side of the frame 1 and is connected to the output shaft of the reducer 24 via a coupling, while the input shaft of the reducer 24 is connected to the output shaft of the servo motor 23 on the sliding plate 22. The sliding plate 22 is mounted above the unwinding mounting base 21 to provide support for the power output of the servo unwinding module 2; after clamping, the servo motor 23 is started, and the power of the servo motor 23 is reduced and increased in torque by the reducer 24 before being transmitted through… The coupling transmits power to the servo unwinding air shaft 25, driving the servo unwinding air shaft 25 to rotate the electrode roll. During this process, according to the real-time production requirements of high-speed electrode cutting, the servo motor 23 can achieve precise start / stop and stepless speed regulation of the roll, providing a stable and controllable power source for the subsequent continuous conveying of the electrode. After the electrode is output from the servo unwinding module 2, it enters the dual-stage closed-loop correction module 3 for lateral position correction. The unwinding correction sensor 33 of this module detects the edge position signal of the electrode in real time and synchronously feeds back the detection signal to the unwinding correction component 31 and the process correction component 32. The drive motor 3110 of the unwinding correction component 31 drives the electrode roll to rotate. The ball screw drive pair 311 operates, and the connecting plate 3112, which is threadedly connected to the ball screw 3111, moves accordingly. Since the connecting plate 3112 is fixedly connected to the sliding plate 22, and the sliding plate 22 is connected to the unwinding correction driven roller 313 through the first connecting plate 314 and the second connecting plate 315, the servo unwinding module 2 moves laterally along the linear guide pair 312, realizing the initial lateral position offset correction of the electrode sheet. The electrode sheet after the initial correction continues to be transported to the downstream process correction assembly 32. The process correction actuator 323 pushes the process correction frame 32 according to the feedback data of the unwinding correction sensor 33. The process correction roller 322 on frame 1 swings or translates to reposition the electrode sheet, and at the same time, it works in conjunction with the process correction transition roller 324 mounted on frame 1 to guide the electrode sheet. Through dual-stage closed-loop control, it ensures that the electrode sheet does not shift laterally during high-speed transmission and maintains a stable posture. The electrode sheet that has completed the correction enters the tension control and buffer module 4. This module includes the tension control component 41 and the tension buffer component 42 to realize constant tension transmission and roll-changing buffer of the electrode sheet. During the normal conveying stage, the tension swing arm roller 412 of the tension control component 41 works in conjunction with the upper tension transition roller 415 and the lower tension transition roller 416 to make the electrode sheet form a stable wrap angle.The tension angle encoder 414 detects the rotation angle of the tension swing arm 411 in real time and feeds the angle signal back to the tension control cylinder 413. The tension control cylinder 413 dynamically adjusts the position of the tension swing arm 411 according to the feedback signal, thereby applying and maintaining a constant tension on the electrode sheet, avoiding stretching, wrinkling or breakage of the electrode sheet due to tension fluctuations. When it is necessary to change the old and new rolls, the tension buffer assembly 42 is activated, and the tension buffer roller linear module 421 drives the tension buffer roller 422 mounted on it to move linearly, providing buffer tension for the roll changing and splicing process, compensating for the sudden tension change at the moment of splicing, and ensuring the continuity of electrode sheet conveying. The electrode sheet with tension adjusted is conveyed to the automatic splicing and electrode tab imprinting module 5, and the new and old rolls are spliced ​​and the electrode tab imprinting process is completed in sequence. In the roll changing and splicing stage, the new and old rolls are joined on the splicing platform 511. The pre-slip transition roller 512 on the inlet side of the splicing platform 511 and the post-slip transition roller 513 on the outlet side guide the electrode sheet smoothly. In the entry and exit of the splicing area, the splicing detection sensor 514 detects the splicing position in real time to assist in the rapid splicing of new and old rolls. After splicing, the electrode sheet continues to be conveyed forward. The electrode ear cylinder 522 of the electrode ear imprinting assembly 52 drives the electrode ear imprinting module 523 downward, which cooperates with the electrode ear imprinting roller 524 to perform multi-process imprinting on the electrode ear area on the electrode sheet to complete the electrode ear forming process. Throughout the unwinding and conveying process, the vision and control module 6 continuously plays a monitoring and control role. Multiple sets of electrode strip deviation visible lasers 61 are set at key positions on the electrode sheet conveying path to display the offset status of the electrode sheet in real time, making it easy for operators to intuitively grasp the electrode sheet transmission posture. At the same time, the control panel 62 is electrically connected to the servo unwinding module 2, the dual-stage closed-loop correction module 3, the tension control and buffer module 4, the automatic splicing module, and the electrode ear imprinting module 523. Operators can set parameters, view the running status, and issue commands through the control panel 62 to achieve centralized and coordinated control of the entire unwinding process. After the above steps, the electrode sheets are continuously output to the high-speed cutting process with stable tension and precise posture, ensuring the smooth progress of high-speed cutting production of lithium battery electrode sheets.

[0062] The unwinding mechanism for high-speed cutting of lithium battery electrode sheets provided by this invention uses a frame 1 as the mounting base and highly integrates functions such as servo unwinding, two-stage closed-loop correction, tension control and buffering, automatic tape splicing and electrode tab imprinting, vision assistance and centralized control onto the frame 1. The structure is compact and rationally laid out, eliminating the need for additional independent equipment, thus improving the overall processing efficiency of the production line and reducing equipment investment and maintenance costs. Simultaneously, a vision and control module 6 is configured to achieve centralized control of the entire process. The modules work collaboratively to ensure the stability, accuracy, and continuity of the electrode sheets during high-speed transmission, making it suitable for high-speed cutting of lithium battery electrode sheets. The requirements include: the servo unwinding module 2 enables precise start / stop and stepless speed regulation of the roll material, adapting to the power requirements of high-speed cutting; the two-stage correction structure of the dual-stage closed-loop correction module 3 effectively eliminates lateral offset of the electrode sheet, ensuring transmission accuracy; the tension control and buffer module 4 combines constant tension transmission with roll changing buffer to avoid electrode sheet damage; the automatic tape splicing and electrode tab imprinting module 5 integrates tape splicing and imprinting functions, improving production continuity and integration; and the vision and control module 6 enables full-process monitoring and centralized control, reducing manual intervention costs and improving the overall efficiency and quality of lithium battery electrode sheet unwinding and conveying.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets, characterized in that, Includes a frame (1) and components mounted on the frame (1) along the electrode advance direction: Servo unwinding module (2) is used to carry and drive the rotation of the electrode roll, and realize the precise start and stop and stepless speed regulation of the electrode roll; A dual-level closed-loop correction module (3) is located downstream of the servo unwinding module (2) and is used to detect and correct the lateral position offset during the electrode transfer process in real time. Tension control and buffer module (4) is used to apply and maintain a constant tension to the electrode during unwinding and to provide buffer tension when switching between old and new rolls; Automatic tape splicing and electrode tab imprinting module (5) is used to realize rapid tape splicing between new and old rolls and to perform multi-process imprinting on the electrode tabs on the electrode sheet; The vision and control module (6) is used to visually detect the deviation of the electrode sheet and to centrally control the servo unwinding module (2), the dual-level closed-loop correction module (3), the tension control and buffer module (4), and the automatic tape splicing and electrode tab imprinting module (5).

2. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 1, characterized in that: The servo unwinding module (2) includes an unwinding mounting base (21) mounted on the frame (1). A sliding plate (22) is mounted above the unwinding mounting base (21). A servo motor (23) is mounted on the sliding plate (22). The output shaft of the servo motor (23) is connected to a reducer (24). The input shaft of the reducer (24) is connected to the output shaft of the servo motor (23). The output shaft of the reducer (24) is connected to a servo unwinding air shaft (25) mounted on one side of the frame (1) via a coupling. The servo unwinding air shaft (25) is used to install and clamp lithium battery positive or negative electrode rolls with different inner diameters. The servo motor (23) drives the servo unwinding air shaft (25) to achieve precise stepless speed regulation and rapid start and stop of positive or negative electrode rolls with different roll diameters and materials.

3. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 2, characterized in that: The dual-stage closed-loop correction module (3) includes: Unwinding and correction component (31), which is connected to the servo unwinding module (2) and is used to drive the servo unwinding module (2) to move laterally as a whole to perform initial correction on the electrode sheet; Process correction component (32), which is located downstream of the unwinding correction component (31), is used to correct the position of the electrode sheet after the initial correction. At least one unwinding correction sensor (33) is provided, which is used to detect the electrode edge position signal in real time and feed it back to the unwinding correction component (31) and the process correction component (32) to realize closed-loop correction control of the electrode.

4. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 3, characterized in that: The unwinding correction assembly (31) includes a ball screw drive pair (311) mounted on the unwinding mounting base (21), a linear guide pair (312) slidably connected to the sliding plate (22), and an unwinding correction driven roller (313) mounted on one side of the frame (1). The ball screw drive pair (311) includes a drive motor (3110) mounted on the unwinding mounting base (21), a ball screw (3111) connected to the output shaft of the drive motor (3110), and a connecting plate (3112) threaded to the ball screw (3111). The connecting plate (3112) is fixedly connected to the sliding plate (22), and the sliding plate (22) is fixedly connected to a first connecting plate (314). The first connecting plate (314) is fixedly connected to a second connecting plate (315) connected to the unwinding correction driven roller (313).

5. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 3, characterized in that: The process correction assembly (32) includes a process correction frame (321) mounted on the frame (1), a process correction roller (322) for the roll material to pass through and a process correction actuator (323) for the process correction roller (322) to swing or translate, the process correction actuator (323) controls the movement of the process correction roller (322) according to the feedback data of the unwinding correction sensor (33) to achieve process correction; the process correction assembly (32) also includes a process correction transition roller (324) rotatably mounted on the frame (1).

6. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 3, characterized in that: The tension control and buffer module (4) includes a tension control component (41) for realizing constant tension transmission of the electrode sheet and a tension buffer component (42) for providing buffer during roll changing. The tension control assembly (41) includes a tension swing arm (411) rotatably mounted on the frame (1), a tension swing arm roller (412) mounted on the tension swing arm (411), a tension control cylinder (413) connected to the tension swing arm (411) for providing or adjusting tension, and a tension angle encoder (414) for detecting the rotation angle of the tension swing arm (411). The tension control cylinder (413) drives the tension swing arm roller (412) to drive and drive the tension swing arm (411) to swing according to the feedback signal of the tension angle encoder (414) to adjust the tension of the traction electrode. The tension buffer assembly (42) includes a linearly movable tension buffer roller module (421) mounted on the frame (1) and a tension buffer roller (422) mounted on the tension buffer roller module (421) for providing tension buffering during roll changing and splicing. The tension buffer roller module (421) drives the tension buffer roller (422) to move during roll changing to provide buffer tension.

7. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 6, characterized in that: The tension control assembly (41) further includes an upper tension transition roller (415) and a lower tension transition roller (416) rotatably mounted on the frame (1). The upper tension transition roller (415), the lower tension transition roller (416), and the tension swing arm roller (412) together form a path for the electrode to form a stable wrap angle.

8. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 1, characterized in that: The automatic tape splicing and tab imprinting module (5) includes an automatic tape splicing component (51) for realizing rapid tape splicing between new and old rolls and a tab imprinting component (52) for performing multi-process imprinting on the tabs. The automatic tape splicing assembly (51) includes a tape splicing platform (511) connected to the frame (1). The tape splicing platform (511) is provided with a front tape transition roller (512) and a rear tape transition roller (513) on the inlet and outlet sides, respectively, for guiding the electrode roll material to enter and leave smoothly. A tape splicing detection sensor (514) for detecting the tape splicing position is provided above the tape splicing platform (511). The tab imprinting assembly (52) includes a tab imprinting mounting plate (521) connected to the frame (1). A tab cylinder (522) is mounted on the tab imprinting mounting plate (521). The output shaft of the tab cylinder (522) is connected to a tab imprinting module (523). A tab imprinting roller (524) is provided on one side of the tab imprinting module (523) to imprint the tab sheet.

9. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 1, characterized in that: The vision and control module (6) includes multiple sets of electrode deviation visible lasers (61) connected to the frame (1). The multiple sets of electrode deviation visible lasers (61) are respectively set at key positions in the electrode roll conveying path and are used to display the offset position of the electrode roll in real time.

10. The unwinding mechanism for high-speed cutting and production of lithium battery electrode sheets according to claim 9, characterized in that: The vision and control module (6) also includes a control panel (62) for parameter setting, status display and centralized control. The control panel (62) is electrically connected to the servo unwinding module (2), the dual-level closed-loop correction module (3), the tension control and buffer module (4) and the automatic tape splicing and tab imprinting module (5).

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