A pole piece scribing chasing system and method

Abstract

The application relates to the technical field of pole piece processing, in particular to a pole piece scribing and chasing system and method, which comprises a mounting rack, a belt running mechanism, a speed detection unit, a laser galvanometer processing unit and a control unit; the belt running mechanism is installed on the mounting rack and is used for driving the pole piece to run at a constant speed along a preset direction; the speed detection unit is electrically connected with the belt running mechanism and the control unit; the laser galvanometer processing unit is installed above the belt running mechanism and is electrically connected with the control unit; the chasing speed and the trajectory compensation amount of the laser galvanometer are calculated through a preset formula, and the laser galvanometer is controlled to be in real-time synchronization with the pole piece running speed. The defects that the high-speed running is not matched with the laser galvanometer processing speed are effectively solved; through the setting of the speed detection unit and the chasing control algorithm, the accurate calculation of the maximum value that the galvanometer does not follow the limit running speed and the galvanometer follows the running speed is combined, and the real-time synchronization of the laser galvanometer chasing speed and the pole piece running speed is realized.

Description

Technical Field

[0001] This invention relates to the field of electrode processing technology, specifically to an electrode scribing and marking system and method. Background Technology

[0002] In the manufacturing process of electrodes (especially battery electrodes), scribing is a key process. Its core purpose is to improve the porosity of the electrode material by etching specific lines on the electrode coating, thereby enhancing the wetting performance of the electrolyte, improving the lithium-ion insertion and extraction efficiency, and ultimately optimizing the battery's charge-discharge efficiency and cycle life. Currently, electrode scribing is mostly performed using laser galvanometer processing. This method has significant advantages such as non-contact operation, high processing precision, and high production efficiency. Its core working principle is to use a galvanometer to drive a reflector to quickly guide a laser beam, completing precise cutting and etching operations on the electrode surface.

[0003] The processing performance of a laser galvanometer is primarily constrained by three core parameters: marking speed, positioning speed, and writing speed. These correspond to the galvanometer's mechanical response capability, control system bandwidth, and communication protocol rate, respectively. They influence and restrict each other, jointly determining the galvanometer's processing upper limit. Specifically, marking speed is the maximum linear velocity at which the galvanometer can complete effective scanning and ensure processing quality during continuous movement; positioning speed is the jump speed during the galvanometer's idle travel phase; and writing speed is the maximum frequency at which the control system sends position commands to the galvanometer. In actual industrial production, to increase production capacity, electrode conveyor speeds have been continuously improved. Currently, industrial production electrode conveyor speeds can reach 30 m / min and above, while the marking speed of conventional industrial-grade laser galvanometers is typically only 20,000-30,000 mm / s. Even with high-end galvanometers, their processing speed cannot fully match the production demands of high-speed electrode conveyor belts.

[0004] When the electrode conveyor belt speed is too fast and the scribing spacing is too small, the scanning and response speed of the laser galvanometer cannot keep up with the movement speed of the electrode conveyor belt. This easily leads to problems such as scribing trajectory deviation, discontinuous lines, and uneven line width. In severe cases, defects such as missed or incorrect scribing may occur, significantly affecting the electrode processing quality and consequently the electrochemical performance of subsequent battery products. In existing technologies, the electrode conveyor belt speed is usually reduced to match the galvanometer processing speed. While this ensures processing accuracy, it significantly sacrifices production efficiency and cannot meet the needs of large-scale industrial mass production. Therefore, developing an electrode scribing and tracking technology that can effectively solve the problem of laser galvanometer processing lag under high-speed conveyor belt conditions and balance processing accuracy and production efficiency has become an urgent need in the current electrode processing field. Summary of the Invention

[0005] To overcome the shortcomings and deficiencies of existing technologies, the present invention aims to provide an electrode scribing and marking system and method. This method is applicable to scribing operations in high-speed conveyor belt environments where the laser galvanometer processing speed and the electrode conveyor belt speed are mismatched.

[0006] The objective of this invention is achieved through the following technical solution: an electrode scribing and tracking system, comprising a mounting frame, a conveyor belt mechanism, a speed detection unit, a laser galvanometer processing unit, and a control unit; The conveyor belt mechanism is mounted on the mounting frame and is used to drive the electrode sheet to move at a constant speed along a preset direction; The speed detection unit is electrically connected to the conveyor mechanism and the control unit, and is used to collect the electrode conveyor speed signal in real time and transmit it to the control unit. The laser galvanometer processing unit is mounted above the conveyor mechanism and electrically connected to the control unit, and is used to scribing the surface of the electrode sheet. The control unit has a built-in tracking control algorithm, which is used to receive the belt speed signal, calculate the tracking speed and trajectory compensation of the laser galvanometer through a preset formula, and control the laser galvanometer and the electrode belt speed to synchronize in real time.

[0007] As an improvement of the electrode marking and tracking system of the present invention, the belt feeding mechanism includes an unwinding roller, a winding roller and a guide roller. The guide roller is used to ensure the flatness of the electrode belt feeding. The belt feeding speed is adjustable in the range of 20-100m / min. The unwinding roller and the winding roller are driven by servo motors, and the speed control accuracy is ±0.2%.

[0008] As an improvement to the electrode marking and tracking system of the present invention, the speed detection unit adopts an incremental encoder, which is installed on the rotating shaft of the guide roller or the take-up roller, with a detection accuracy of ±0.2% and a detection frequency greater than or equal to 100Hz.

[0009] As an improvement to the electrode scribing and marking system of the present invention, the laser galvanometer processing unit includes a laser generator, a galvanometer assembly, a focusing lens group, and a position adjustment assembly; the galvanometer assembly adopts a digital galvanometer, and the marking speed is adaptively adjusted within the range of 20000-60000 mm / s; the focusing lens group can focus the laser beam into a spot of 80-130 μm; the position adjustment assembly adopts a servo motor adjustment mechanism.

[0010] As an improvement to the electrode scribing and tracking system of the present invention, the control unit further includes a human-machine interaction module and a galvanometer correction module. The human-machine interaction module is used to input processing parameters and display the operating status. The galvanometer correction module adopts a multi-point correction method, and the full-width processing accuracy is as high as ±10um. The control unit has built-in calculation logic for the galvanometer not following the limit of the tape travel speed, the maximum value of the galvanometer following the tape travel speed, and the flight coefficient.

[0011] The control unit of this invention adopts a PLC controller, which has built-in tracking control algorithm, speed compensation algorithm and galvanometer correction module. It is electrically connected to the servo motor of the conveyor mechanism, the encoder of the speed detection unit and the laser galvanometer processing unit. The control unit is also equipped with a touch screen as a human-machine interaction module. The operator can input processing parameters such as scribing trajectory, line width and conveyor speed through the touch screen, and at the same time view the conveyor speed, galvanometer tracking speed, processing progress and fault information in real time. In addition, the control unit has built-in calculation logic for the galvanometer not following the limit conveyor speed, the maximum value of the galvanometer following the conveyor speed and the flight coefficient. It can automatically complete the calculation of various parameters and issue control commands to realize the automated control of the processing process.

[0012] Another object of the present invention is to provide a method for scribing and tracing electrodes, including an electrode scribing and tracing system, and further including the following steps: (1) Parameter initialization: Input the electrode processing parameters, and the control unit initializes the galvanometer scanning parameters and the initial belt speed; (2) Electrode conveyor belt start-up: The conveyor belt mechanism drives the electrode conveyor belt, and the speed detection unit collects the conveyor belt speed signal in real time and transmits it to the control unit; (3) Tracking parameter calculation: The control unit calculates the tracking speed of the galvanometer, the limit speed at which the galvanometer does not follow the belt, the maximum speed at which the galvanometer follows the belt, and the trajectory compensation amount by means of the tracking control algorithm and the belt speed and preset formula; (4) Synchronous tracking processing: control the laser galvanometer to perform scribing processing according to the tracking speed and compensation trajectory, adjust the parameters in real time to maintain synchronization, and at the same time calibrate the scribing spacing through the flight coefficient formula; (5) Processing termination: Upon receiving the termination command, each component stops working and the processing is completed.

[0013] As an improvement to the electrode scribing and tracking method of the present invention, in step (3), the calculation formula for the galvanometer not following the limiting tape speed is: The unit is m / min. The unit T2 needs to be converted to seconds (1 ms = 0.001 s). The final result is shown in the table: The galvanometer does not follow the limiting belt travel speed. V =12.24489796 m / min; .

[0014] The formula for calculating the maximum speed of the galvanometer following the conveyor belt is: After substituting the parameters into the table and calculating, we get V max =69.78875761m / min.

[0015] As an improvement to the electrode scribing and tracking method of the present invention, step (4) further includes a precision detection step, in which the scribing image is acquired in real time by the image acquisition unit, transmitted to the control unit and analyzed for line width and trajectory offset. If the line width and trajectory offset exceed the preset precision range, the processing parameters are automatically adjusted. At the same time, in order to correct the deviation between the theoretical line spacing and the actual scribing line spacing, the formula is used to correct the deviation between the theoretical line spacing and the actual scribing line spacing. The actual flight coefficient is calculated, and the scribing line spacing is calibrated in real time to ensure that the scribing accuracy is consistent with the preset requirements. During the processing, in order to correct the deviation between the theoretical line spacing and the actual scribing line spacing and improve the scribing accuracy, calibration using the flight coefficient is necessary. The specific calculation formula is as follows: Where f is the actual flight coefficient, f1 is the set flight coefficient, d is the set line spacing, and d1 is the measured line spacing after processing; the actual flight coefficient calculated by this formula can be used to calibrate subsequent processing parameters, so that the line spacing approaches the preset value and further improves processing accuracy.

[0016] The beneficial effects of this invention are as follows: 1. Effectively solves the drawback of mismatch between high-speed conveyor belt and laser galvanometer processing speed: By setting up a speed detection unit and tracking control algorithm, combined with precise calculation of the galvanometer not following the limit speed of the conveyor belt and the maximum value of the galvanometer following the conveyor belt speed, real-time synchronization between the laser galvanometer tracking speed and the electrode conveyor belt speed is achieved. Even if the electrode conveyor belt speed reaches 50m / min or more, the laser galvanometer can accurately follow, completely avoiding problems such as scribing offset, missing scribing, and incorrect scribing, effectively improving the scribing accuracy of the electrode, with a scribing line width accuracy of 80-130μm, and the trajectory offset strictly controlled within ±10um.

[0017] 2. Balancing production efficiency and processing quality: There is no need to adapt laser galvanometer processing by reducing the electrode conveyor speed. It can stably maintain the production efficiency of high-speed conveyor belts. At the same time, through dynamic trajectory compensation, precision closed-loop control and flight coefficient calibration, it ensures stable and reliable processing quality, which can meet the needs of large-scale industrial mass production and significantly improve production capacity.

[0018] 3. Simple structure and strong adaptability: The overall structure of the system is compact, eliminating the need for additional multi-head galvanometers, effectively reducing equipment purchase costs and subsequent maintenance costs; it can flexibly adapt to electrode sheets of different thicknesses and widths, as well as different scribing trajectory requirements through parameter adjustment, making it compatible with various electrode processing scenarios and highly practical.

[0019] 4. Easy to operate and stable: Processing parameters can be quickly set through the human-machine interface module, the system operating status can be monitored in real time, and fault information can be alarmed in time, which is convenient for operators to handle quickly; the control unit adopts a closed-loop control mode, combined with galvanometer correction technology, to ensure long-term stable operation of the system, with a failure rate of less than 1%. Attached Figure Description

[0020] Figure 1 This is a flowchart of the electrode scribing and tracing method of the present invention. Detailed Implementation

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0022] Example 1: A polarimeter scribing and tracking system, comprising a mounting frame, a conveyor belt mechanism, a speed detection unit, a laser galvanometer processing unit, and a control unit: The conveyor belt mechanism includes an unwinding roller, a winding roller, and two guide rollers, all fixedly mounted on the mounting frame. The unwinding roller holds the coil of electrode sheets to be processed, and the winding roller winds up the processed electrode sheets. The two guide rollers are respectively positioned between the unwinding roller and the laser galvanometer processing unit, and between the laser galvanometer processing unit and the winding roller, to ensure the flatness of the electrode sheets during the conveyor belt process and prevent electrode sheet misalignment. The conveyor belt speed of this mechanism can be flexibly adjusted within the range of 20-100 m / min. The conveyor belt mechanism is driven by a servo motor, and the speed control accuracy reaches ±0.2%, meeting the requirements of high-speed conveyor belt production.

[0023] The speed detection unit uses an incremental encoder, which is installed on the guide roller shaft near the take-up roller. The encoder rotates synchronously with the guide roller. By detecting the rotation speed of the shaft, the speed of the electrode tape is accurately calculated. The encoder has a detection frequency of 100Hz and a detection accuracy of ±0.1m / min. It is electrically connected to the control unit via a data cable and can transmit the collected speed signal to the control unit in real time.

[0024] The laser galvanometer processing unit is mounted on a bracket above the conveyor belt mechanism and consists of a laser generator, a galvanometer assembly, a focusing lens group, and a position adjustment assembly. The laser generator uses a fiber laser with adjustable output power and a wavelength of 1064nm, suitable for etching the electrode coating. The galvanometer assembly uses a high-speed digital galvanometer with a marking speed of 20,000-60,000 mm / s, offering fast positioning and short response time, allowing for rapid adaptation to changes in conveyor belt speed. The focusing lens group has a focal length of F160~F420mm, focusing the laser beam into a fine spot with a diameter of 60~80μm, ensuring precise marking. The position adjustment assembly uses a servo motor adjustable mechanism, allowing for flexible adjustment of the laser galvanometer's height and horizontal position to accommodate electrode processing requirements of different thicknesses.

[0025] The control unit uses a PLC controller with built-in tracking control algorithm, speed compensation algorithm, and galvanometer correction module. It is electrically connected to the servo motor of the conveyor mechanism, the encoder of the speed detection unit, and the laser galvanometer processing unit, respectively. The control unit is also equipped with a touch screen as a human-machine interface module. Operators can input processing parameters such as scribing trajectory, line width, and conveyor speed through the touch screen, and at the same time view the conveyor speed, galvanometer tracking speed, processing progress, and fault information in real time. In addition, the control unit has built-in calculation logic for the galvanometer not following the limit conveyor speed, the maximum value of the galvanometer following the conveyor speed, and the flight coefficient. It can automatically complete the calculation of various parameters and issue control commands to realize the automated control of the processing process.

[0026] Furthermore, the laser galvanometer processing unit also integrates a position adjustment component, which is used to flexibly adjust the height and horizontal position of the laser galvanometer to adapt to the processing needs of electrode sheets of different thicknesses and widths. The position adjustment component adopts a servo motor adjustable mechanism, which not only has high adjustment accuracy but also is easy to operate and can quickly complete parameter adaptation.

[0027] Furthermore, the control unit also includes a human-machine interface module, which is used by operators to input processing parameters (such as scribing trajectory, line width, belt conveyor speed threshold, etc.) and display the system operating status in real time (such as belt conveyor speed, galvanometer processing speed, fault alarm information, etc.), so that operators can monitor the system operation in real time and adjust the processing parameters in a timely manner according to production needs.

[0028] Example 2, as Figure 1 As shown, a method for scribing and tracing electrodes includes an electrode scribing and tracing system, and further includes the following steps: (1) Parameter initialization: The operator inputs the processing parameters (consistent with the core parameters in the table) through the touch screen, sets the scribing trajectory to a parallel straight line, the line width to 100μm, the scribing depth to 15μm, the preset belt speed to 69m / min, the galvanometer processing accuracy requirement to ±10um, and sets the flight coefficient f1 at the same time; the control unit automatically initializes the initial scanning speed of the laser galvanometer to 0mm / s and the initial belt speed of the belt conveyor to 0 according to the input parameters.

[0029] (2) Electrode feeding start: The operator sends a start command through the touch screen, and the control unit drives the servo motor of the feeding mechanism to start. The unwinding roller unwinds synchronously and the winding roller winds synchronously. The electrode feeds along the guide roller at a uniform speed, and the feeding speed gradually increases to the preset 69.78m / min. At the same time, the encoder of the speed detection unit starts synchronously, and collects the rotation speed of the guide roller every 0.01 seconds, calculates the electrode feeding speed, and transmits the speed signal to the control unit in real time.

[0030] (3) Tracking parameter calculation: The control unit receives the real-time belt speed signal transmitted by the encoder (stable above 50m / min), calculates the tracking speed through the built-in tracking control algorithm, and uses the formula To calculate the galvanometer's non-following limit speed, substitute the parameters in the table to obtain the results. V=1 2.24489796 m / min; Subsequently, through the formula Calculate the maximum speed of the galvanometer following the conveyor belt, and then substitute the parameters to obtain the result. V max ≈69.78875761m / min; The control unit monitors the belt speed fluctuation in real time. If a fluctuation of ±5m / min occurs, it immediately calculates the corresponding trajectory compensation amount to ensure that the marked trajectory does not deviate.

[0031] (4) Synchronous tracking processing: The control unit sends the tracking speed command and trajectory compensation command to the laser galvanometer processing unit. The laser generator emits a laser, and the galvanometer assembly drives the laser beam to perform precise scribing on the electrode surface according to the calculated tracking speed and compensation trajectory. During the processing, the image acquisition unit acquires scribing images in real time, and the control unit analyzes the scribing line width and trajectory offset in real time. If the line width deviation exceeds ±5μm, the position of the focusing lens group and the scanning speed of the galvanometer are automatically adjusted to ensure processing accuracy. The speed detection unit continuously acquires the belt speed, and the control unit finely adjusts the tracking speed in real time according to the speed change to maintain the synchronization between the galvanometer and the electrode belt. After processing, the actual scribing distance d1 is measured and calculated using the formula. The actual flight coefficient f is calculated and used for subsequent calibration of processing parameters to further improve processing accuracy.

[0032] (5) Processing termination: When the electrode roll is completed, the take-up roller triggers the positioning signal. After receiving the signal, the control unit immediately sends a stop command. The belt conveyor stops conveying, the laser generator stops emitting laser, the galvanometer assembly is reset, and the speed detection unit stops working. This completes the current electrode scribing and engraving process.

[0033] In this embodiment, the processed electrode sheet has uniform scribing line width and no trajectory deviation, with a scribing qualification rate of 99.95%. The conveyor belt speed is stable at 69.78 m / min, and the production efficiency is 5.7 times higher than that of the traditional processing method. It effectively solves the technical problem that the laser galvanometer processing speed cannot keep up under high-speed conveyor belt conditions and has good prospects for industrial application.

[0034] The core input parameters of the electrode scribing and tracing method of the present invention are shown in the table below:

[0035] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A scribing and marking system for electrodes, characterized in that, It includes a mounting frame, conveyor mechanism, speed detection unit, laser galvanometer processing unit, and control unit; The conveyor belt mechanism is mounted on the mounting frame and is used to drive the electrode sheet to move at a constant speed along a preset direction; The speed detection unit is electrically connected to the conveyor mechanism and the control unit, and is used to collect the electrode conveyor speed signal in real time and transmit it to the control unit. The laser galvanometer processing unit is mounted above the conveyor mechanism and electrically connected to the control unit, and is used to scribing the surface of the electrode sheet. The control unit has a built-in tracking control algorithm, which is used to receive the belt speed signal, calculate the tracking speed and trajectory compensation of the laser galvanometer through a preset formula, and control the laser galvanometer and the electrode belt speed to synchronize in real time.

2. The electrode scribing and tracking system according to claim 1, characterized in that, The belt feeding mechanism includes an unwinding roller, a winding roller, and a guide roller. The guide roller is used to ensure the flatness of the electrode sheet belt feeding. The belt feeding speed is adjustable in the range of 20-100m / min. The unwinding roller and the winding roller are driven by servo motors, and the speed control accuracy is ±0.2%.

3. The electrode scribing and tracking system according to claim 1, characterized in that, The speed detection unit uses an incremental encoder, which is installed on the shaft of the guide roller or the take-up roller. The detection accuracy is ±0.2%, and the detection frequency is greater than or equal to 100Hz.

4. The electrode scribing and tracking system according to claim 1, characterized in that, The laser galvanometer processing unit includes a laser generator, a galvanometer assembly, a focusing lens group, and a position adjustment assembly; the galvanometer assembly adopts a digital galvanometer, and the marking speed is adaptively adjusted within the range of 20,000-60,000 mm / s; The focusing lens group can focus the laser beam into a spot of 80-130μm; the position adjustment component adopts a servo motor adjustment mechanism.

5. The electrode scribing and tracking system according to claim 1, characterized in that, The control unit also includes a human-machine interaction module and a galvanometer correction module. The human-machine interaction module is used to input processing parameters and display the operating status. The galvanometer correction module adopts a multi-point correction method, and the full-width processing accuracy is up to ±10um. The control unit has built-in calculation logic for the galvanometer not following the limit of the belt travel speed, the maximum value of the galvanometer following the belt travel speed, and the flight coefficient.

6. A method for scribing and tracing electrode lines, comprising the electrode scribing and tracing system according to any one of claims 1-5, characterized in that, It also includes the following steps: (1) Parameter initialization: Input the electrode processing parameters, and the control unit initializes the galvanometer scanning parameters and the initial belt speed; (2) Electrode conveyor belt start-up: The conveyor belt mechanism drives the electrode conveyor belt, and the speed detection unit collects the conveyor belt speed signal in real time and transmits it to the control unit; (3) Tracking parameter calculation: The control unit calculates the tracking speed of the galvanometer, the limit speed at which the galvanometer does not follow the belt, the maximum speed at which the galvanometer follows the belt, and the trajectory compensation amount by means of the tracking control algorithm and the belt speed and preset formula; (4) Synchronous tracking processing: control the laser galvanometer to perform scribing processing according to the tracking speed and compensation trajectory, adjust the parameters in real time to maintain synchronization, and at the same time calibrate the scribing spacing through the flight coefficient formula; (5) Processing termination: Upon receiving the termination command, each component stops working and the processing is completed.

7. The electrode scribing and tracing method according to claim 6, characterized in that, Step (4) also includes a precision detection step, in which the scribing image is acquired in real time by the image acquisition unit, transmitted to the control unit, and the line width and trajectory offset are analyzed. If the line width and trajectory offset exceed the preset precision range, the processing parameters are automatically adjusted. At the same time, in order to correct the deviation between the theoretical line spacing and the actual scribing line spacing, the formula is used. Calculate the actual flight coefficient and calibrate the spacing between the graduations in real time.

8. The electrode scribing and tracing method according to claim 6, characterized in that, In step (3), the formula for calculating that the galvanometer does not follow the limiting belt speed is: The unit is m / min.

9. The electrode scribing and tracing method according to claim 6, characterized in that, In step (3), the formula for calculating the maximum value of the galvanometer following the conveyor belt speed is: ,in V To prevent the galvanometer from following the limiting belt speed V unit The value after conversion to m / min.

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