Laser etching control system and method for battery piece

Abstract

The invention provides a laser etching control system and method for a battery piece, and relates to the field of laser etching processing, and the system comprises a positioning platform which is used for fixing the battery piece; the laser equipment comprises a laser and a scanning galvanometer and is used for outputting laser beams acting on the battery piece; the beam splitter is positioned on the output side of the laser and is used for splitting the single laser beam into a plurality of diffraction-order light beams; the focusing lens / lens array is located on one side, deviating from the laser, of the beam splitter and is vertically aligned with the diffraction-level light beams output by the beam splitter, so that multiple beams of light act on a battery piece after being focused to form light spots, and local etching is carried out; and the control unit communicates with the positioning platform, the beam splitter, the scanning galvanometer and the focusing lens / lens array, and controls the beam splitter, the scanning galvanometer and the focusing lens / lens array to dynamically adjust the laser beams, so that the laser beams act on the battery piece to complete etching, and the problem that most existing single-beam laser acts on the surface of the battery piece, so that the etching efficiency is high is solved. The production efficiency is low; and the etching surface performance is poor.

Description

Technical Field

[0001] The present invention relates to the field of laser etching processing, and in particular to a laser etching control system and method for a battery cell. Background Art

[0002] Laser etching mainly uses high-energy laser beams to perform precise heat treatment on cells, evaporating or melting materials through local heating, thereby forming a groove structure on the surface or inside the material. Single-beam laser etching technology is one of the most commonly used laser etching methods and is widely used in the manufacturing process of solar cells. The basic principle of this technology is to use a single beam of laser to scan the surface of the cell point by point, and remove the material through the high energy density of the laser to form the required microstructure.

[0003] However, when a single laser beam is irradiated on the surface of the cell, the cell is locally heated to above the boiling point, evaporated and formed into a gasified area, which causes the material in the heat-affected zone to undergo thermal deformation, oxidation and phase change when the groove is formed, resulting in a decrease in the conductivity of the cell. Therefore, it has problems such as low production efficiency, large heat-affected zone, and poor adaptability. Summary of the invention

[0004] In order to overcome the above technical defects, the purpose of the present invention is to provide a laser etching control system and method for a battery cell, so as to solve the problem that most existing single-beam lasers act on the surface of the battery cell, resulting in low production efficiency and poor etching surface performance.

[0005] The present invention also discloses a laser etching control system for a battery cell, comprising:

[0006] Positioning platform, used to fix the battery cell;

[0007] Laser equipment, including a laser and a scanning galvanometer, used to output a laser beam acting on the battery cell;

[0008] A beam splitter, located at the output side of the laser, splits a single laser beam into multiple diffraction-order sub-beams;

[0009] A focusing lens / lens array is located on the side of the beam splitter away from the laser and is vertically aligned with the diffraction-order sub-beams output by the beam splitter, so that multiple beams of light are focused and act on the cell to form a light spot for local etching;

[0010] The control unit communicates with the positioning platform, the beam splitter, the scanning galvanometer and the focusing lens / lens array, controls the beam splitter, the scanning galvanometer and the focusing lens / lens array to dynamically adjust the laser beam, thereby acting on the battery cell to complete etching.

[0011] Preferably, the beam splitter adopts a surface diffraction grating with an asymmetric structure, wherein the surface roughness of the surface diffraction grating does not exceed 10 nm.

[0012] Preferably, an automatic optical detection component is integrated on the positioning platform to collect real-time images;

[0013] And / or, high-speed data communication is established between the positioning platform and the scanning galvanometer.

[0014] Preferably, a microchannel cooling component is provided on the side of the beam splitter facing away from the laser;

[0015] And / or, a constant temperature device is connected to the side of the beam splitter;

[0016] And / or, a high thermal conductivity coating is provided on a side of the focusing lens / lens array facing away from the beam splitter.

[0017] Preferably, the positioning platform is provided with a plurality of vacuum adsorption holes to fix the battery sheet by negative pressure.

[0018] The present invention also discloses a laser etching control method for a battery cell, which uses any of the above-mentioned laser etching control systems and comprises:

[0019] The battery cell is fixed on the positioning platform, and the control unit starts the laser device to output the laser beam;

[0020] The laser beam is divided into multiple diffraction-order beams after passing through a beam splitter, and then forms a light spot through a focusing lens / lens array for local etching;

[0021] The control unit communicates with the positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array, and determines the edge of the battery cell and the etching pattern area in real time on the positioning platform to control the beam splitter, scanning galvanometer and focusing lens / lens array to dynamically adjust the laser beam, thereby acting on the battery cell to complete etching.

[0022] Preferably, the real-time image is captured by integrating an automatic optical detection component on the positioning platform and sent to the control unit, and the control unit runs an image recognition algorithm to determine the edge of the battery cell and the etching pattern area.

[0023] Preferably, before the control unit starts the laser device, the control unit autonomously calibrates the edge of the battery cell.

[0024] Preferably, the control unit controls the laser equipment to have a laser adjustment range of 10 to 40 W, with an adjustment accuracy not exceeding ±1 W; and / or, the beam splitter temperature rise does not exceed 5°C; and / or, the formed spot overlap area exceeds 90%; and / or, the communication delay does not exceed 1 ms.

[0025] Preferably, the control unit controls the beam splitter, scanning galvanometer and focusing lens / lens array in a multi-threaded synchronous manner, so that the laser beam acts on the battery cell.

[0026] Compared with the prior art, the above technical solution has the following beneficial effects:

[0027] 1. The use of laser combined with beam splitter to achieve multi-beam operation at the same time improves the etching speed, reduces the number of laser repeated scanning, shortens the overall processing time, and improves production efficiency;

[0028] 2. The laser has an extremely short pulse width and high energy density. Combined with the beam splitter, it can realize cold processing of rectangular cells, reduce the generation of heat-affected zones, and keep the surface of the cell better after etching;

[0029] 3. The laser beam is dynamically adjusted through the control unit to achieve high-precision and high-precision microstructure etching, which significantly improves the etching speed and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a hardware structure diagram of embodiments 1 and 2 of a laser etching control system and method for a battery cell according to the present invention;

[0031] Figure 2 It is a module schematic diagram of embodiments 1 and 2 of a laser etching control system and method for a battery cell according to the present invention;

[0032] Figure 3 This is a method flow chart of Embodiment 2 of a laser etching control system and method for a battery cell according to the present invention.

[0033] Reference numerals:

[0034] 1-positioning platform; 11-cell; 12-automatic optical detection assembly; 2-laser; 3-beam splitter; 4-focusing lens / lens array; 5-control unit. DETAILED DESCRIPTION

[0035] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0037] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] It should be understood that the word "if" as used herein may be interpreted as "when" or "when" or "in response to determining," depending on the context.

[0039] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0041] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and have no specific meanings. Therefore, "module" and "component" can be used interchangeably.

[0042] Example 1: This embodiment also provides a laser etching control system for a battery cell, and applies the etching control method described in Example 2, using a specific integrated beam splitter with stable refractive index, high transmittance and other characteristics, ensuring high transmittance (>95%) within the laser wavelength range, reducing beam splitting errors, and ensuring high precision and efficiency of the etching position. The system and method are intended to achieve high-quality microstructure etching. It can be understood that the simultaneous operation of multiple laser beams through the beam splitter significantly improves the speed and efficiency of etching, and is suitable for microstructure etching of rectangular battery cells. As an example, the specific rectangular battery size can be 91mm x 182mm; 105mm x 210mm.

[0043] The system, see Figure 1 and Figure 2 ,include:

[0044] The positioning platform is used to fix the battery cell; specifically, in order to improve the stability of the battery cell fixation, the positioning platform is provided with a plurality of vacuum adsorption holes to fix the battery cell by negative pressure, thereby reducing the problem of poor etching effect caused by the movement of the battery cell during the application process.

[0045] Laser equipment, including but not limited to lasers and scanning galvanometers, is used to output laser beams acting on the battery cells; scanning galvanometers and lasers are two key components in the laser processing system, and the main function of the scanning galvanometer is to control the direction and position of the laser beam. The direction of the laser beam can be changed by the rapid rotation of the galvanometer. It is understood that the laser outputs a single laser beam with a short pulse width and high energy density. The laser equipment may also include other existing modules / devices that enable it to operate normally.

[0046] The beam splitter is located at the output side of the laser and splits the single laser beam into multiple diffraction-order beams. Specifically, the single laser beam is split into multiple diffraction-order beams by the beam splitter. As a preferred setting, the beam splitter adopts a surface diffraction grating with an asymmetric structure, wherein the surface roughness of the surface diffraction grating does not exceed 10 nm, so that the single laser beam can be split into 5 to 7 beams, and the energy distribution and direction of each beam are optimized, and the energy distribution error of each beam is less than 2%.

[0047] The light beams of the above-mentioned diffraction orders have the same wavelength, but the laser beam splitting spacing is different, which can cover a larger etching area and reduce the frequency of repeated scanning, which not only shortens the etching time, but also improves the etching speed and efficiency to achieve high-precision beam distribution.

[0048] It is understood that in this embodiment, the beam splitter is installed on the laser output path to ensure that the beam splitter is aligned with the laser beam output by the laser, the energy of each beam is evenly distributed, and the diffraction efficiency is ≥90%. The beam splitter has a stable refractive index and high light transmittance characteristics to reduce the absorption and scattering of light, improve the energy utilization of the beam, ensure the accuracy of etching, and ensure the uniformity and stability of the beam.

[0049] As an illustration, the above-mentioned laser device outputs a single laser beam with high energy density, and the cold processing of the surface of the battery cell is achieved through the beam splitter, which can effectively avoid the generation of heat-affected zone, so that the surface of the battery cell maintains good performance after etching.

[0050] As an illustration, a specific beam splitter and / or beam splitter parameters may be selected according to actual scenarios to further improve etching efficiency and effects.

[0051] The focusing lens / lens array is located on the side of the beam splitter away from the laser, and is vertically aligned with the diffraction-order light beam output by the beam splitter, so that multiple beams of light are focused and act on the battery cell to form a light spot for local etching; the diffracted light beams (multiple laser beams) are refocused through the focusing lens / lens array, and the multiple beams of light act on the surface of the battery cell to form a uniform light spot, thereby achieving local etching with high energy density.

[0052] The control unit communicates with the positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array, controls the beam splitter, scanning galvanometer and focusing lens / lens array to dynamically adjust the laser beam, so as to act on the cell to complete etching. Specifically, the laser beam is dynamically adjusted, including but not limited to adjusting the laser beam path, position, direction, movement, etc. The laser beam is precisely moved, and a preset program can be carried to control scanning the cell line by line / or with a preset moving path to complete etching.

[0053] It can be understood that the above-mentioned positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array can also be connected to a driving structure and / or a device / system for realizing the above-mentioned adjustment of the laser beam. As an example, there is an existing motion unit / rotation unit that can be integrated in the focusing lens / lens array, etc., which does not affect the etching of the laser beam and can realize the control of the laser beam by coordinating the working parameters of each device. The control unit can issue instructions to each driving structure to realize dynamic adjustment.

[0054] As an illustration, the above-mentioned communication with the positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array is used to control the working status and working parameters of the aforementioned devices, specifically as described in the following embodiment 2, to obtain the edge of the battery cell and the etched pattern area (including the pattern area to be etched and the etched pattern area) on the positioning platform in real time, so as to dynamically control the operation of the beam splitter, scanning galvanometer and focusing lens / lens array, realize precise movement of the laser beam, and realize etching on the entire battery cell.

[0055] In this embodiment, the laser outputs a laser beam with extremely short pulse width and high energy density combined with a beam splitter to achieve cold processing of the cell. The control unit dynamically adjusts the laser beam path, and multiple beams are processed simultaneously to increase the etching speed, reduce the number of repeated scans, and improve production efficiency. It also has the advantages of stable refractive index, high transmittance, and small beam splitting error, ensuring high precision and efficiency of the etching position.

[0056] In a preferred embodiment, in order to achieve precise control of the laser beam by the above-mentioned control unit, it is necessary to confirm the current etching status of the battery cell on the positioning platform, so an automatic optical inspection component (AOI component) is integrated on the positioning platform to capture real-time images; specifically, the AOI component may include a camera, a lens, a moving mechanism, a light source, a PLC, and a computer device (executing a target detection algorithm (identifying edges) and / or an image processing algorithm, etc., that is, processing the captured real-time image to improve the operating efficiency of the subsequent control unit).

[0057] And / or, further, high-speed data communication is established between the positioning platform and the scanning galvanometer. As an example, EtherCAT high-speed data communication is used to ensure that the time difference between the beam position and the scanning galvanometer feedback is less than 1ms. It can be understood that in addition to the above-mentioned positioning platform and scanning galvanometer, the control unit and the positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array communication can also apply the above-mentioned high-speed data communication, and other existing high-speed data transmission methods that can be used for this purpose can also replace the above-mentioned EtherCAT high-speed data communication.

[0058] As an option, an optical power sensor may be integrated to monitor the actual output power of each light beam and feed back the power to the control unit to further improve the control accuracy of the control unit.

[0059] Based on the above, the beam splitter achieves the above-mentioned improvement in work efficiency and reduction in heat-affected zone. Therefore, as an option, the transmittance can be increased by setting a deposited anti-reflection film to further reduce the loss, and the laser wave characteristics can be used to disperse the light beam into different diffraction directions.

[0060] Furthermore, in a preferred embodiment, a microfluidic cooling assembly is provided on the side of the beam splitter away from the laser; and / or a thermostat is connected to the side of the beam splitter; and / or the thermal expansion coefficient of the base profile can be set to be less than 0.5 μm / K, and / or a high thermal conductivity coating is provided on the side of the focusing lens / lens array away from the beam splitter. Specifically, the temperature difference of the coolant in the microfluidic cooling assembly is within ±0.5°C, thereby maintaining the temperature stability of the system during operation and reducing the impact of temperature fluctuations on the accuracy of the splitting and / or focusing operations. Specifically, the above-mentioned thermostat may include a cooling assembly and a heating assembly, as well as equipment such as a temperature control sensor to control the temperature to remain within a certain range.

[0061] Based on the above, the laser etching control system provided in this embodiment can operate multiple laser beams simultaneously. It can achieve high-precision and high-precision microstructure etching through the control unit, which significantly improves the etching speed and efficiency. It is suitable for high-precision and high-quality etching of rectangular (or even other shapes) battery cell microstructures.

[0062] Embodiment 2: This embodiment provides a method for controlling laser etching of a cell, and applies the laser etching control system of the above embodiment 1, specifically, to achieve high-precision, high-quality, and high-efficiency etching of a rectangular cell microstructure, see Figure 1-Figure 3 ,include:

[0063] S10: Fix the battery cell on the positioning platform, and the control unit starts the laser device to output a laser beam; as described in the first embodiment, the positioning platform can improve the stability of the battery cell connection through negative pressure.

[0064] Based on the above, as a further option, the battery cell can also be moved using a clamp, such as a vacuum suction cup, a mechanical clamp, etc., to operate the battery cell to prevent fingerprints and external impurities from adhering to the battery cell and affecting the subsequent etching effect. The optical alignment instrument and other equipment can also be used to ensure its precise alignment.

[0065] S20: the laser beam is divided into a plurality of diffraction-order beams after passing through a beam splitter, and then forms a light spot through a focusing lens / lens array to perform local etching;

[0066] Specifically, a single laser beam can be divided into 5 to 7 diffraction-order beams. The energy of each beam is evenly distributed, and each diffraction-order beam has the same wavelength, but the laser beam splitting spacing is different, which can cover a larger etching area. Specifically, the working parameters of the beam splitter and / or the distribution of each diffraction-order beam can be adjusted with the laser equipment (such as the parameters of the scanning galvanometer), etc., to control the overlap of each diffraction-order beam, and the focusing lens / lens array (array) has a high power carrying capacity. The diffracted beam is refocused through the lens, and the multiple beams of light are combined with the surface of the rectangular battery to form a uniform light spot to achieve etching.

[0067] S30: The control unit communicates with the positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array, and determines the edge of the battery cell and the etching pattern area in real time on the positioning platform to control the beam splitter, scanning galvanometer and focusing lens / lens array to dynamically adjust the laser beam, thereby acting on the battery cell to complete etching.

[0068] Specifically, the control unit will communicate with each device (positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array) to monitor the path of the laser beam, the working parameters of each device, and the position where the laser beam is etching in real time and accurately, so as to make dynamic adjustments according to the etching state of the battery cell on the positioning platform, and realize functions including but not limited to precise movement of multiple beams working simultaneously and line-by-line scanning.

[0069] Specifically, as a preference, the control unit controls the laser adjustment range of the laser device to be 10 to 40w, and the adjustment accuracy does not exceed ±1w; and / or the temperature rise of the beam splitter does not exceed 5°C (achieved by the microchannel cooling component and / or constant temperature equipment in the above-mentioned embodiment 1); and / or the overlapping area of ​​the formed light spots exceeds 90% (by controlling the working parameters of the beam splitter); and / or the communication delay does not exceed 1ms (such as achieved by the above-mentioned application of high-speed data communication).

[0070] Based on the above, in order to achieve better control accuracy, the control unit can be configured to capture real-time images by integrating an automatic optical detection component on the positioning platform and send the real-time images to the control unit, and the control unit runs an image recognition algorithm to determine the edge of the battery cell and the etching pattern area.

[0071] Specifically, as described in the above-mentioned embodiment 1, the automatic optical detection component can realize the determination of the edge (contour) of the battery cell and the etching pattern area, including the completed etching pattern area, the unfinished etching pattern area and the specific completed etching image, etc. by realizing image acquisition and target detection through hardware. Specifically, the component can be equipped with an existing applicable target detection algorithm or image recognition algorithm for processing and feedback to the control unit, or image recognition can be performed in the control unit.

[0072] In a preferred embodiment, based on the above, the control unit can obtain a real-time image on the positioning platform. Therefore, it can be arranged that before the control unit starts the laser device, the control unit autonomously calibrates the edge of the battery cell. Specifically, the edge of the battery cell in the real-time image is identified and calibrated with the preset battery cell placement area. That is, when the battery cell is placed at an angle, a warning signal can be fed back to the positioning platform, or the operation of the mechanical clamp as described above can be autonomously controlled.

[0073] Furthermore, the control unit is configured to synchronously control the beam splitter, scanning galvanometer and focusing lens / lens array through multi-threading, so that the laser beam acts on the battery cell. Specifically, as an example, the high-speed galvanometer deflection control signal (acting on the laser device) and the positioning platform synchronous control can be applied to realize precise movement and line-by-line scanning of multiple beams at the same time, thereby further improving the etching speed and efficiency.

[0074] As an illustration, a high-bandwidth bus protocol is used to achieve communication, which improves the response speed between the laser and the galvanometer and positioning platform. It enhances multi-task parallelism and achieves synchronization delay of ≤1ms during multi-beam operation, thereby achieving accurate and efficient control.

[0075] Based on the above, as a supplement, the control unit can be equipped with preset software or programs and cooperate with the various hardware devices in the control system in the above-mentioned embodiment one to realize the control of the autonomous etching process. The control system in the above-mentioned embodiment one can also integrate existing modules / devices / equipment that can realize the above-mentioned control method. Embodiments one and two are only used to distinguish between hardware and software, and are both used for laser etching of battery cells, and do not represent their advantages and disadvantages.

[0076] Specifically, the above-mentioned control unit can be a computer device equipped with a program to implement the above-mentioned control method. The computer device at least includes but is not limited to: a memory, a processor, and also includes multiple storage media on which programs are stored. When the program is executed by the processor, the corresponding function is realized to implement the above-mentioned method.

[0077] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A laser etching control system for a battery cell, characterized in that: include: Positioning platform, used to fix the battery cell; Laser equipment, including a laser and a scanning galvanometer, used to output a laser beam acting on the battery cell; A beam splitter, located at the output side of the laser, splits a single laser beam into multiple diffraction-order sub-beams; A focusing lens / lens array is located on the side of the beam splitter away from the laser and is vertically aligned with the diffraction-order sub-beams output by the beam splitter, so that multiple beams of light are focused and act on the cell to form a light spot for local etching; The control unit communicates with the positioning platform, the beam splitter, the scanning galvanometer and the focusing lens / lens array, controls the beam splitter, the scanning galvanometer and the focusing lens / lens array to dynamically adjust the laser beam, thereby acting on the battery cell to complete etching.

2. The laser etching control system according to claim 1, characterized in that: The beam splitter adopts a surface diffraction grating with an asymmetric structure, wherein the surface roughness of the surface diffraction grating does not exceed 10 nm.

3. The laser etching control system according to claim 1, characterized in that: The positioning platform is integrated with an automatic optical detection component to collect real-time images; And / or, high-speed data communication is established between the positioning platform and the scanning galvanometer.

4. The laser etching control system according to claim 1, characterized in that: A microchannel cooling component is arranged on a side of the beam splitter away from the laser; And / or, a constant temperature device is connected to the side of the beam splitter; And / or, a high thermal conductivity coating is provided on a side of the focusing lens / lens array facing away from the beam splitter.

5. The laser etching control system according to claim 1, characterized in that: The positioning platform is provided with a plurality of vacuum adsorption holes to fix the battery sheet by negative pressure.

6. A method for controlling laser etching of a cell, characterized in that: The laser etching control system according to any one of claims 1 to 5 comprises: The battery cell is fixed on the positioning platform, and the control unit starts the laser device to output the laser beam; The laser beam is divided into multiple diffraction-order beams after passing through a beam splitter, and then forms a light spot through a focusing lens / lens array for local etching; The control unit communicates with the positioning platform, beam splitter, scanning galvanometer and focusing lens / lens array, and determines the edge of the battery cell and the etching pattern area in real time on the positioning platform to control the beam splitter, scanning galvanometer and focusing lens / lens array to dynamically adjust the laser beam, thereby acting on the battery cell to complete etching.

7. The laser etching control method according to claim 6, characterized in that: The real-time image is captured by integrating the automatic optical detection component on the positioning platform and sent to the control unit, and the control unit runs an image recognition algorithm to determine the edge of the battery cell and the etching pattern area.

8. The laser etching control method according to claim 6, characterized in that: Before the control unit starts the laser device, the control unit autonomously calibrates the edge of the battery cell.

9. The laser etching control method according to claim 6, characterized in that: The control unit controls the laser device to have a laser adjustment range of 10 to 40 W, with an adjustment accuracy not exceeding ±1 W; and / or a beam splitter temperature rise not exceeding 5° C.; and / or a formed light spot overlap area exceeding 90%; and / or a communication delay not exceeding 1 ms.

10. The laser etching control method according to claim 6, characterized in that: The control unit controls the beam splitter, scanning galvanometer and focusing lens / lens array synchronously through multithreading, so that the laser beam acts on the battery cell.

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