Battery electrode material complexing system and cleaning method using simultaneous laser cleaning

Abstract

The application provides a battery electrode material complexing and synchronous laser cleaning system and a cleaning method, and comprises a first laser module, wherein the first laser module outputs a laser beam with an energy range of 0.5-4 mj and a pulse width range of 100-1000 ns; a second laser module, wherein the second laser module outputs a laser beam with an energy range of less than 0.5 mj and a pulse width range of 0.1-100 ns; and an output assembly comprising a fiber beam combining module, a collimator, a galvanometer and a field lens arranged in sequence along an output direction; the first laser module is connected with a first input connecting end of the fiber beam combining module through a first optical fiber; and the second laser module is connected with a second input connecting end of the fiber beam combining module through a second optical fiber. The application has the advantages of simple structure, synchronous cleaning of two laser modes, high cleaning efficiency, good cleaning effect and reduced thermal influence of laser on materials.

Description

Technical Field

[0001] This invention relates to the field of laser cleaning technology, and in particular to a synchronous laser cleaning system and method for battery electrode materials. Background Technology

[0002] Laser cleaning, as a novel surface removal technology, boasts numerous advantages such as high efficiency, high flexibility, and no consumables. Currently, mature applications include cleaning negative electrode sheets, positive electrode sheets, sealing pins, and housings. However, existing cleaning processes often require multiple cleaning cycles, which reduces cleaning efficiency.

[0003] Traditional laser cleaning technology typically uses infrared nanosecond MOPA lasers and ordinary galvanometers. This method often struggles to achieve thorough cleaning or a cleaning effect without damaging the foil in a single pass when processing thick materials. To achieve better cleaning results, multiple passes are usually required, a process that is not only time-consuming but also inefficient. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a synchronous laser cleaning system and method for battery electrode materials. The system has a simple structure, features simultaneous cleaning with two laser modes, achieves high cleaning efficiency and good results, and reduces the thermal impact of the laser on the materials.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] A synchronous laser cleaning system for battery electrode materials, comprising:

[0007] The first laser module outputs a laser beam with an energy range of 0.5-4 mJ and a pulse width range of 100-1000 ns.

[0008] The second laser module outputs a laser beam with an energy range of less than 0.5 mJ and a pulse width range of 0.1-100 ns.

[0009] The output components include an optical fiber combiner module, a collimator, a galvanometer, and a field lens arranged sequentially along the light output direction; the first laser module is connected to the first input connection terminal of the optical fiber combiner module via a first optical fiber; the second laser module is connected to the second input connection terminal of the optical fiber combiner module via a second optical fiber.

[0010] According to a preferred embodiment, the first laser module outputs a laser beam with an energy range of 0.5-2 mJ and a pulse width range of 100-500 ns;

[0011] The second laser module outputs a laser beam with an energy range of less than 0.5 mJ and a pulse width range of 0.5-100 ns.

[0012] According to a preferred embodiment, the fiber optic bundling module includes a first bundling fiber and a second bundling fiber, wherein the first input connection end of the fiber optic bundling module is the input end of the first bundling fiber, and the second input connection end of the fiber optic bundling module is the input end of the second bundling fiber.

[0013] According to a preferred embodiment, the formula for calculating the center-to-center distance between the first bundled optical fiber and the second bundled optical fiber is as follows:

[0014] B = X * (D - (D * C)) * (E / F)

[0015] Where B is the center-to-center distance between the first bundled fiber and the second bundled fiber;

[0016] C represents the beam overlap ratio;

[0017] D is the diameter of the laser spot;

[0018] X is the fiber spacing multiple;

[0019] E is the collimating focal length;

[0020] F is the focal length of the field lens.

[0021] According to a preferred embodiment, the value of the fiber spacing multiple is greater than or equal to 2.

[0022] According to a preferred embodiment, the fiber optic bundle module further includes a QBH crystal or an optical collimator isolator.

[0023] According to a preferred embodiment, the spot overlap rate ranges from 0.4 to 0.6.

[0024] A cleaning method for a synchronous laser cleaning system for battery electrode materials includes the following steps:

[0025] Step S10: When cleaning begins, the initial position L of the first laser module is preset. When the first laser module reaches the initial position L, the first laser module is controlled to emit light and move linearly back and forth in the X-axis direction for cleaning.

[0026] Step S20: Move along the Y-axis of the galvanometer. When the second laser module reaches the initial position L, control the second laser module to emit light and clean by linear reciprocating movement in the X-axis direction.

[0027] Step S30: Continue moving along the Y-axis of the galvanometer, while the first laser module and the second laser module move in a straight reciprocating motion in their respective X-axis directions for cleaning.

[0028] Step S40: When the cleaning is finished, the first laser module stops emitting light. When the position of the second laser module reaches the position of the line generated during the off period of the first laser module, the second laser module stops emitting light.

[0029] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0030] This invention is equipped with a first laser module and a second laser module to achieve high-energy, long-pulse-width laser output and low-energy, short-pulse-width laser output for cleaning batteries. Through an optical fiber combining module, it realizes the output of one laser, two laser spots and laser parameters. With the help of a galvanometer system, it can complete dual-beam synchronous cleaning and achieve precise control of the laser trajectory. Its structure is simple, the cleaning efficiency is high and the effect is good, and the thermal impact of the laser on the material is reduced. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structural principle of the battery electrode material composite synchronous laser cleaning system provided in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the cross-sectional structure of the fiber optic bundle combining module provided in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the cleaning area and cleaning path provided in an embodiment of the present invention.

[0035] Icons: 1. First laser module; 2. Second laser module; 3. First optical fiber; 4. Second optical fiber; 5. Fiber optic bundle module; 6. Collimator; 7. Galvanometer; 8. Field lens; 9. First bundle fiber; 10. Second bundle fiber; L. Initial position. Detailed Implementation

[0036] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0039] Example

[0040] Please refer to Figures 1 to 3 A synchronous laser cleaning system for battery electrode materials includes: a first laser module 1, wherein the first laser module 1 outputs a laser beam with an energy range of 0.5-4 mJ and a pulse width range of 100-1000 ns; a second laser module 2, wherein the second laser module 2 outputs a laser beam with an energy range of less than 0.5 mJ and a pulse width range of 0.1-100 ns; the output components include an optical fiber combiner module 5, a collimator 6, a galvanometer 7, and a field lens 8 arranged sequentially along the light output direction; the first laser module 1 is connected to the first input connection end of the optical fiber combiner module 5 through a first optical fiber 3; the second laser module 2 is connected to the second input connection end of the optical fiber combiner module 5 through a second optical fiber 4.

[0041] Preferably, the first laser module 1 outputs a laser beam with an energy range of 0.5-2 mJ and a pulse width range of 100-500 ns;

[0042] The second laser module 2 outputs a laser beam with an energy range of less than 0.5 mJ and a pulse width range of 0.5-100 ns.

[0043] Preferably, the fiber optic bundled module 5 includes a first bundled fiber 9 and a second bundled fiber 10. The first input connection end of the fiber optic bundled module 5 is the input end of the first bundled fiber 9, and the second input connection end of the fiber optic bundled module 5 is the input end of the second bundled fiber 10.

[0044] Preferably, the formula for calculating the center-to-center distance between the first bundled fiber 9 and the second bundled fiber 10 is as follows:

[0045] B = X * (D - (D * C)) * (E / F)

[0046] Where B is the center-to-center distance between the first bundled fiber 9 and the second bundled fiber 10;

[0047] C represents the beam overlap ratio;

[0048] D is the diameter of the laser spot;

[0049] X is the fiber spacing multiple;

[0050] E is the collimating focal length;

[0051] F represents the focal length of the field lens (8).

[0052] Preferably, the fiber spacing multiple is greater than or equal to 2.

[0053] Preferably, the fiber optic bundle module 5 also includes a QBH crystal or an optical collimator isolator.

[0054] Preferably, the beam overlap rate is in the range of 0.4-0.6.

[0055] A cleaning method for a synchronous laser cleaning system for battery electrode materials includes the following steps:

[0056] Step S10: When cleaning begins, the initial position L of the first laser module 1 is preset. When the first laser module 1 reaches the initial position L, the first laser module 1 is controlled to emit light and clean by linear reciprocating movement in the X-axis direction.

[0057] Step S20: Move along the Y-axis of the galvanometer. When the light-emitting position of the second laser module 2 reaches the initial position L, control the second laser module 2 to emit light and clean by linear reciprocating movement in the X-axis direction.

[0058] Step S30: Continue to move along the Y-axis of the galvanometer, while the first laser module 1 and the second laser module 2 move in a straight line reciprocating motion in their respective X-axis directions for cleaning.

[0059] Step S40: When the cleaning is finished, the first laser module 1 first stops emitting light. When the position of the second laser module 2 reaches the position of the line generated during the off period of the first laser module 1, the second laser module 2 stops emitting light.

[0060] Working principle of the invention:

[0061] In this embodiment, M represents the cleaning area, including... Figure 3The area is defined by dashed lines, solid lines, and the rectangular region formed between the dashed and solid lines (the area below the solid line L is the cleaning area). When the laser beam from the first laser module 1 reaches the initial position L, the output position of the second laser module 2 shifts to position K, at which point the second laser module 2 stops emitting light. After the first laser module 1 and the second laser module 2 move towards the Y-axis, when the output position of the second laser module 2 reaches the initial position L, the second laser module 2 cleans the light emitted from the initial position L, while the first laser module 1 horizontally reciprocates along the X-axis direction on the side (lower side) of the initial position L towards the Y-axis. Here, P is the center-to-center distance of the light spots, and B is the center-to-center distance between the first bundled fiber 9 and the second bundled fiber 10. Figure 2 As shown, the positional distribution between the first combining fiber 9 and the second combining fiber 10 can be observed. In this embodiment, the first fiber 3 and the second fiber 4 can be fused onto a QBH crystal or connected to an optical collimator isolator to achieve spatial laser beam combining. The output light mentioned above refers to the output laser beam. The first laser module 1 and the second laser module 2 are each controlled by an independent controller, allowing independent setting of laser parameters, including output time, power, frequency, pulse width, and output delay. In this embodiment, the output laser beam corresponding to the first laser module 1 is the first focused beam, and the output laser beam corresponding to the second laser module 2 is the second focused beam. Figure 1 Below the mid-field mirror 8 are the first and second focused beams, which are not shown with labels in the attached diagram.

[0062] In this embodiment, the movement is in the direction of the galvanometer's Y-axis movement. Figure 3 The beam is moved along the Y-axis, causing the first and second focused beams to move in the Y-axis direction. After adjustment in the Y-axis direction, horizontal reciprocating movement is performed in the X-axis direction for cleaning. Specifically, this embodiment is applied to the cleaning of lithium battery electrode materials.

[0063] In this embodiment, two laser beams can be output simultaneously: the first laser module 1 outputs a high-energy, long-pulse laser beam; the second laser module 2 outputs a low-energy, short-pulse laser beam. The two laser beams are connected in a single fiber optic connector via an optical fiber combiner module 5, enabling synchronous output. Each laser's internal optical module is independent, allowing for precise control of the two beams. Users can flexibly adjust the output power and pulse width according to actual cleaning needs. The combined laser beam achieves precise trajectory control via a galvanometer mirror 7. The galvanometer mirror 7 can quickly and accurately adjust the laser's irradiation position, enabling the transmission of the laser output to the processing material and high-speed trajectory scanning.

[0064] In the cleaning method, the two laser beams bundled within a single fiber optic bundle module 5 (fiber optic connector) are not concentric but maintain a certain center distance. During the cleaning process, the cleaning direction is perpendicular to the line connecting the centers of the two beams. This method enables a single cleaning process using a high-energy, long-pulse laser and a single cleaning process using a low-energy, short-pulse laser. Although these two cleaning processes are independent, they can be performed simultaneously, thereby improving cleaning efficiency.

[0065] By controlling the light emission timing as described above, it is possible to achieve a cleaning function where there are no single-laser cleaning areas at the top and bottom of the cleaning area, and the internal cleaning is completed simultaneously through one galvanometer scan and two cleaning cycles.

[0066] This embodiment employs two laser modules and a fiber optic spatial beam combining method to achieve one set of lasers, two laser spots and laser parameter outputs, and a galvanometer 7 to complete dual-beam synchronous cleaning for lithium battery electrode materials.

[0067] The cleaning method employs simultaneous cleaning with different pulse width modes and pulse energies to achieve rapid material cleaning, reduce the impact of laser on the material, and improve cleaning efficiency. This embodiment integrates different pulse width modes and pulse energies, eliminating the need for multiple lasers. High pulse energy and long pulse duration can remove material quickly; low pulse energy and short pulse duration can finely clean away remaining material, balancing cleaning efficiency and effectiveness. Simultaneous cleaning with two laser modes changes the original series-based cleaning method to parallel cleaning, significantly improving cleaning efficiency. Simultaneous cleaning allows for rapid completion of cleaning, reducing the thermal impact of the laser on the material. Combined with a high-speed galvanometer 7, the number of cleaning cycles can be stacked; two simultaneous cleaning cycles (four internal cleaning cycles) are equivalent to four cleaning cycles, but with a significant reduction in cleaning time. This invention significantly improves cleaning efficiency. For cleaning large-area electrode sheets, it can reduce the number of laser systems, reducing equipment complexity. Furthermore, a single cleaning cycle (two internal cycles) can employ a fly-through cleaning method, further improving equipment operating efficiency. Figure 1 The solid box containing both the first laser module 1 and the second laser module 2 can be represented as a composite laser, such as the MOPA composite laser.

[0068] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A synchronous laser cleaning system for battery electrode materials, characterized in that, include: The first laser module outputs a laser beam with an energy range of 0.5-4 mJ and a pulse width range of 100-1000 ns. The second laser module outputs a laser beam with an energy range of less than 0.5 mJ and a pulse width range of 0.1-100 ns. The output components include an optical fiber combiner module, a collimator, a galvanometer, and a field lens arranged sequentially along the light output direction; the first laser module is connected to the first input connection terminal of the optical fiber combiner module via a first optical fiber; the second laser module is connected to the second input connection terminal of the optical fiber combiner module via a second optical fiber.

2. The battery electrode material composite synchronous laser cleaning system according to claim 1, characterized in that, The first laser module outputs a laser beam with an energy range of 0.5-2 mJ and a pulse width range of 100-500 ns; The second laser module outputs a laser beam with an energy range of less than 0.5 mJ and a pulse width range of 0.5-100 ns.

3. The battery electrode material composite synchronous laser cleaning system according to claim 2, characterized in that, The fiber optic bundling module includes a first bundling fiber and a second bundling fiber. The first input connection end of the fiber optic bundling module is the input end of the first bundling fiber, and the second input connection end of the fiber optic bundling module is the input end of the second bundling fiber.

4. The battery electrode material composite synchronous laser cleaning system according to claim 3, characterized in that, The formula for calculating the center-to-center distance between the first and second bundled optical fibers is as follows: B = X * (D - (D * C)) * (E / F) Where B is the center-to-center distance between the first bundled fiber and the second bundled fiber; C represents the beam overlap ratio; D is the diameter of the laser spot; X is the fiber spacing multiple; E is the collimating focal length; F is the focal length of the field lens.

5. The battery electrode material composite synchronous laser cleaning system according to claim 4, characterized in that, The value of the fiber spacing multiple is greater than or equal to 2.

6. The battery electrode material composite synchronous laser cleaning system according to claim 3, characterized in that, The fiber optic bundle combining module also includes a QBH crystal or an optical collimator isolator.

7. The battery electrode material composite synchronous laser cleaning system according to claim 4, characterized in that, The overlap rate of the light spots ranges from 0.4 to 0.

6.

8. A cleaning method for a synchronous laser cleaning system for battery electrode materials, characterized in that, Includes the following steps: Step S10: When cleaning begins, the initial position L of the first laser module is preset. When the first laser module reaches the initial position L, the first laser module is controlled to emit light and move linearly back and forth in the X-axis direction for cleaning. Step S20: Move along the Y-axis of the galvanometer. When the second laser module reaches the initial position L, control the second laser module to emit light and clean by linear reciprocating movement in the X-axis direction. Step S30: Continue moving along the Y-axis of the galvanometer, while the first laser module and the second laser module move in a straight reciprocating motion in their respective X-axis directions for cleaning. Step S40: When the cleaning is finished, the first laser module stops emitting light. When the position of the second laser module reaches the position of the line generated during the off period of the first laser module, the second laser module stops emitting light.

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