A laser marking device and laser marking method

Abstract

This invention relates to the field of laser technology, specifically to a laser scribing device and method. The laser scribing device provided by this invention includes at least two scribing mechanisms, each comprising a laser source and a focusing lens. The laser beam emitted by the laser source forms a light source point on the scribing plane after passing through the focusing lens. The projection of the straight line connecting the center points of two adjacent focusing lenses onto the scribing plane is inclined relative to a preset scribing direction at an angle of α. Thus, the scribing interval is not the length of the line connecting the center points of the two focusing lenses. Therefore, the scribing interval can be adjusted by adjusting the angle α. This allows the focusing lens to be set at a sufficient safe distance from the scribing plane to prevent impurities generated during scribing from splashing onto and contaminating the focusing lens. Furthermore, it eliminates the need to adjust the size of the focusing lens; only the angle α needs to be adjusted to change the scribing interval. This provides flexible adjustment of the scribing interval, a wider adjustment range, and broader applicability.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and specifically to a laser scribing device and a laser scribing method. Background Technology

[0002] During the fabrication of solar cells, it is usually necessary to scribing lines on the cells to form the required electrode patterns or to separate different cell units. Currently, mechanical etching, chemical etching, or laser etching are commonly used to scribing lines on the cells.

[0003] Mechanical scribing can easily cause mechanical damage to the surface of solar cells, potentially leading to material deformation and cracks. Chemical etching, on the other hand, is difficult to control completely uniformly due to factors such as solution distribution, concentration, and reaction time, resulting in different etching depths in different areas of the solar cell. Furthermore, chemical solutions are usually corrosive and may corrode other material components of the solar cell. Therefore, laser scribing is currently the most common method for scribing the surface of solar cells.

[0004] In laser scribing, a beam of light emitted from an optical fiber is focused by a focusing lens to form a light source point, which falls on the scribing surface of the solar cell. The position of the light source point is related to the size of the lens and the distance between the lens and the scribing surface of the solar cell. When the lens is too close to the solar cell to be scribed, impurities generated during the scribing process will splash onto the lens and contaminate it. Therefore, the lens needs to be at a sufficient safe distance from the scribing surface of the solar cell. However, after meeting the distance requirement, in order to ensure that the light source point falls on the scribing surface of the solar cell, the size of the focusing lens needs to be increased. Currently, in the process of scribing solar cells, multiple light source points are usually scribed simultaneously to increase scribing efficiency. In the process of scribing multiple light source points simultaneously, multiple lenses are arranged in a row, and the lines connecting multiple lenses are perpendicular to the preset scribing direction. The minimum scribing interval is the distance between the centers of two lenses, which means that the minimum scribing interval is directly related to the size of the lens. In order to ensure that the lens is at a sufficient safe distance from the scribing surface of the solar cell, the lens size needs to be increased. Increasing the lens size will lead to a larger minimum spacing of the lines scribed by the optical fiber on the solar cell. Summary of the Invention

[0005] (i) The technical problem to be solved by the present invention is that in order to avoid impurities generated during the scribing process from sputtering onto the lens and causing contamination, existing laser scribing equipment requires a sufficient distance between the lens and the scribing plane, which results in a larger lens size and a larger scribing interval.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, one embodiment of the present invention provides a laser scribing device, including: at least two scribing mechanisms, each scribing mechanism including a laser source and a focusing lens, wherein the laser source is used to emit laser light and incident on the focusing lens, and the focusing lens focuses the laser light passing through it onto the scribing plane to form a light source point;

[0008] The angle between the projection of the line connecting the center points of the focusing lenses of two adjacent sets of the scribing mechanism onto the scribing plane and the preset scribing direction is α, and the projection length of the line connecting the center points of two adjacent focusing lenses onto the scribing plane is L1.

[0009] The distance between two adjacent light source points in the direction perpendicular to the scribbling line is the scribbling interval L2, where L1 = sinα * L2.

[0010] According to one embodiment of the present invention, multiple sets of the marking mechanisms are arranged sequentially to form a dense marking pattern;

[0011] The angle of inclination α between the projection of the line connecting the center points of the multiple closely spaced focusing lenses onto the scribe plane and the preset scribe direction is α.

[0012] According to one embodiment of the present invention, the laser scribing device includes multiple sets of closely spaced scribing lines;

[0013] In each group of closely spaced scribing lines, the light source points of two adjacent scribing mechanisms have the same scribing interval perpendicular to the scribing direction.

[0014] The spacing between the dabbles in the multiple sets of closely spaced dabbles is equal.

[0015] According to one embodiment of the present invention, the line connecting the multiple light source points in each group of closely spaced lines is a straight line, and the straight lines connecting the multiple light source points in multiple groups of closely spaced lines are parallel to each other.

[0016] Any of the scribed lines closely arranged form a line projection on the scribed plane, and the shortest distance between two adjacent line projections is Z, where Z≥L1.

[0017] According to one embodiment of the present invention, the scribing mechanism further includes a collimating lens disposed between the laser source and the focusing lens;

[0018] And / or, the laser source includes an optical fiber, and the light beam emitted from the optical fiber is incident on the focusing lens.

[0019] According to one embodiment of the present invention, the marking mechanism further includes a fixed bracket, and the optical fiber and the focusing lens are both fixed to the fixed bracket.

[0020] According to one embodiment of the present invention, the fixing bracket includes a sleeve, which is sleeved on the outside of the optical fiber and the focusing lens;

[0021] And / or, the fixing bracket includes at least two fixing members, and the plurality of fixing members define an accommodating space, wherein the laser source and the focusing lens are both located in the accommodating space; the fixing members are disposed in the non-contact area of ​​two adjacent sets of the scribing mechanism.

[0022] According to one embodiment of the present invention, the laser scribing device further includes an adjustment mechanism for adjusting the tilt angle α;

[0023] The adjustment mechanism includes connecting rods mounted on a fixed bracket, with two adjacent connecting rods hinged together, and the ends of the connecting rods fixed to the fixed bracket.

[0024] And / or, the adjustment mechanism includes an adjustment member that clamps the fixed bracket, the adjustment member including a fixing buckle corresponding to the fixed bracket.

[0025] Another embodiment of the present invention provides a laser scribing method, which scribing lines on a scribing plane based on the laser scribing device described in any of the above embodiments, the method comprising the following steps:

[0026] Obtain the projection length L2 of the preset scribing interval L1 and the line connecting the center points of two adjacent focusing lenses on the scribing plane;

[0027] Based on the scribing interval L1 and the projection length L2, the inclination angle α between the projection of the line connecting the center points of two adjacent focusing lenses onto the scribing plane and the preset scribing direction is determined, where α = arcsin(L1 / L2).

[0028] After adjusting the scribing mechanism based on the tilt angle α, a light source point is formed on the scribing plane;

[0029] The drawing plane is controlled to move along a preset drawing direction, and the light source point moves relative to the drawing plane to draw lines.

[0030] According to an embodiment of the present invention, before obtaining the projection length L2 of the line connecting the preset scribing interval L1 and the center points of two adjacent focusing lenses on the scribing plane, the method further includes:

[0031] Determine the safe distance K1 between the focusing lens and the scribing plane;

[0032] Determine the distance K2 between the focusing lens and the scribing plane, where K2 ≥ K1;

[0033] The size of the focusing lens is determined based on the distance K2.

[0034] According to one embodiment of the present invention, the focusing lens (14) is circular and the radius of the focusing lens is Q1, then Q1≤L2 / 2.

[0035] The beneficial effects of this invention are as follows: The laser scribing device provided by this invention includes at least two scribing mechanisms, each including a laser source and a focusing lens. The laser beam emitted by the laser source forms a light source point on the scribing plane after passing through the focusing lens. The projection of the line connecting the center points of two adjacent focusing lenses onto the scribing plane is inclined relative to the preset scribing direction, with an inclination angle of α. Thus, the scribing interval is not the length of the line connecting the center points of the two focusing lenses. Therefore, the scribing interval can be adjusted by adjusting α. This allows the focusing lens to be set at a sufficient safe distance from the scribing plane to prevent impurities generated during the scribing process from splashing onto the focusing lens and causing contamination. It also eliminates the need to adjust the size of the focusing lens; only α needs to be adjusted to adjust the scribing interval. On the one hand, it avoids the problem of large space occupation due to an excessively large focusing lens size. On the other hand, it allows for flexible adjustment of the scribing interval, resulting in a wider adjustment range and broader applicability. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 A schematic diagram of a laser scribing device is provided for one embodiment of the present invention;

[0038] Figure 2 A schematic diagram of a laser scribing device provided in another embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of a laser scribing device provided in another embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the marking mechanism provided in one embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the marking mechanism provided in another embodiment of the present invention;

[0042] Figure 6 A schematic diagram illustrating the cooperation between the adjustment mechanism and the marking mechanism is provided for one embodiment of the present invention;

[0043] Figure 7 A schematic diagram illustrating the cooperation between the adjustment mechanism and the marking mechanism according to another embodiment of the present invention;

[0044] Figure 8 This is a top view showing the coordination between the adjustment mechanism and the scribing mechanism in another embodiment of the present invention.

[0045] Icons: 1-Scribble mechanism; 11-Sleeve; 12-Fiber optic fastener; 13-Collimating lens; 14-Focusing lens; 15-Fiber optic cable; 16-Support rod; 161-Accommodation space; 2-Scribble plane; 21-Light source point; 3-Adjustment mechanism; 31-Adjustment component; 311-Accommodation space; 32-Drive component; 33-Connecting rod; 331-Line hole. Detailed Implementation

[0046] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0047] According to one embodiment of the present invention, such as Figures 1 to 8 As shown, the present invention provides a laser marking device, comprising: at least two sets of marking mechanisms 1, each marking mechanism 1 including a laser source and a focusing lens 14, the laser source emitting laser light which is incident on the focusing lens 14, the focusing lens 14 focusing the laser light passing through it onto the marking plane 2 to form a light source point 21; the projection of the line connecting the center points of the focusing lenses 14 of two adjacent sets of marking mechanisms 1 onto the marking plane 2 is inclined relative to a preset marking direction, with an inclination angle of α, the projection length of the line connecting the center points of two adjacent focusing lenses 14 on the marking plane 2 is L2, that is, the distance between the center lines of two adjacent focusing lenses 14 is L2, the radius of the focusing lens 14 is Q1, and the distance between two adjacent light source points 21 perpendicular to the marking direction is the marking interval L1, where L1 = sinα * L2.

[0048] In existing laser scribing devices, multiple scribing mechanisms 1 are arranged in a row, and the centers of the focusing lenses 14 of the multiple scribing mechanisms 1 are connected by a straight line, which is perpendicular to the preset scribing direction. Therefore, the scribing interval is equal to the distance between two adjacent focusing lenses 14. In order to prevent impurities generated during the scribing process from splashing onto the focusing lens 14 and causing contamination, the focusing lens 14 needs to be at a sufficient safe distance from the scribing surface of the battery cell. While ensuring that the focusing lens 14 has a sufficient distance from the scribing surface of the battery cell, in order to ensure that the light source point 21 falls on the scribing plane 2, the size of the focusing lens 14 needs to be increased, which will result in a larger scribing interval.

[0049] The laser scribing device provided in this application does not arrange the multiple scribing mechanisms 1 along a direction perpendicular to the preset scribing direction. Instead, the projection of the line connecting the center points of the focusing lenses 14 of two adjacent scribing mechanisms 1 onto the scribing plane 2 is tilted relative to the preset scribing direction by an angle of α. Therefore, the scribing distance is not the distance between two adjacent focusing lenses 14. The scribing interval L1 = sinα * L2. Thus, the scribing interval can be changed simply by changing the value of α. The scribing interval can be adjusted without increasing the size of the focusing lenses 14, resulting in a more compact overall structure. Furthermore, the scribing interval can be flexibly adjusted according to scribing requirements, with a wider adjustment range and broader applicability.

[0050] The laser scribing device provided in this application can scribing on the scribing plane 2 using only a scribing mechanism 1 including a focusing lens 14 and a laser source, without the need for other optical components such as a refractor. The laser source is focused on the scribing plane 2 by the focusing lens 14 without passing through other optical components, avoiding unnecessary energy loss and reducing the complexity and physical size of the scribing device. The more optical components involved in the scribing mechanism, the higher the sensitivity of the scribing device to changes in the external environment, the greater the challenge of maintaining the stability of the optical system, and the more optical components the light passes through and the more reflections it undergoes, the more stray light will be generated. This unexpected light will ultimately affect the scribing quality and scribing accuracy.

[0051] In this application, the relative positions of the laser source and focusing lens 14 in each scribing device are fixed. The laser source is located above the focusing lens 14 and emits laser light into the focusing lens 14. The laser light is focused by the focusing lens 14 onto the scribing plane 2 to form a light source point 21. The scribing plane 2 is moved, and the light source point 21 scribes a line on the scribing plane 2. In this application, the center of the focusing lens 14 (also called a condenser lens or lens) is its geometric center, that is, the midpoint of the line connecting the centers of curvature of the two surfaces of the lens. For an ideal spherical lens or aspherical lens, this center point is the point where light theoretically will not be deflected when passing through the lens, that is, the point where the principal optical axis intersects the lens. For example, in this application, the focusing lens 14 is a circular lens, and the distance between the center lines of two adjacent focusing lenses 14 is equal to the sum of the radii of the two focusing lenses 14.

[0052] like Figure 1 and 2As shown, in the laser scribing device provided by the present invention, multiple sets of scribing mechanisms 1 are arranged sequentially to form a scribing close-packed array, and the focusing lenses 14 of the corresponding multiple sets of scribing mechanisms 1 are arranged sequentially to form a focusing lens close-packed array. The angle of inclination between the projection of the line connecting the center points of the multiple focusing lenses 14 in the scribing close-packed array onto the scribing plane 2 and the preset scribing direction is α. In this application, by arranging multiple scribing mechanisms 1 in a row, multiple lines can be scribed on the scribing plane 2 at one time, thus improving scribing efficiency. In the scribing process, it is preferable to complete the scribing of the entire scribing plane 2 in a preset direction at one time. Therefore, multiple sets of scribing close-packed arrays are set up, and the scribing operation of the entire scribing plane 2 can be completed at one time through multiple sets of scribing close-packed arrays. Among them, the multiple focusing lenses 14 in the scribing close-packed array can be attached to each other, or they can be spaced apart from each other, or multiple focusing lenses 14 can be attached to each other and spaced apart from each other at the same time. That is, the scribing interval of two adjacent scribing mechanisms 1 can be the same or different, which can be selected according to the scribing requirements.

[0053] In this application, the closely spaced scribed lines can be set in one group or multiple groups, depending on the width of the scribed plane 2 perpendicular to the preset scribed line direction. For example, as Figure 2 As shown, the width of the scribing plane 2 perpendicular to the preset scribing direction is too large, and a single scribing array cannot complete the scribing operation for the entire scribing plane 2. Therefore, multiple scribing arrays are set up to complete the scribing operation for the entire scribing plane 2 in one scribing operation.

[0054] According to one embodiment of the present invention, such as Figure 3 As shown, the scribing mechanisms 1 are not arranged in a row, but rather the focusing lenses 14 of every two adjacent scribing mechanisms 1 are connected, and the line connecting the center points of two adjacent focusing lenses 14 is inclined relative to the projection of the scribing plane 2. This also enables the scribing interval to be changed by changing the tilt angle α, and the scribing operation of the entire scribing plane 2 to be completed in one operation.

[0055] Preferably, in this application, the structure and size of each scribing mechanism 1 are the same, that is, the size of the focusing lens 14 of each scribing mechanism 1 is the same, the laser emitted by the laser source is the same, and the distance between the laser source and the focusing lens 14 is also the same. The focusing lenses 14 of multiple scribing mechanisms 1 are located in the same plane. At this time, after the laser sources of multiple scribing mechanisms 1 are focused by the focusing lens 14, they all form light source points 21 on the scribing plane 2, and the line connecting two adjacent light source points 21 is inclined relative to the preset scribing direction. In order to reduce the space occupied and reduce the scribing interval, it is preferable to connect the outer sides of the focusing lenses 14 of two adjacent scribing mechanisms 1. When multiple groups of scribing mechanisms 1 are connected in sequence to form a scribing close-up, the focusing lenses 14 of each group of scribing mechanisms 1 are connected in sequence to form a scribing close-up. When multiple scribing mechanisms 1 are not arranged in a row to form a scribing close-up, the focusing lenses 14 of two adjacent scribing mechanisms 1 are close together, and the line connecting the centers of two adjacent focusing lenses 14 is inclined.

[0056] According to another embodiment of the present invention, the focusing lenses 14 of the plurality of scribing mechanisms 1 are of different sizes. Since it is necessary to ensure that the laser emitted by the laser source of each scribing mechanism 1 is focused by the focusing lens 14 to form a light source point 21 on the scribing plane 2, the focusing lenses 14 of different sizes are not located in the same plane. Preferably, according to an embodiment of the invention, the size of the plurality of focusing lenses 14 increases sequentially, and the position of the plurality of focusing lenses 14 in the vertical direction increases sequentially. It can also achieve the formation of a light source point 21 on the scribing plane 2. At the same time, the scribing interval can also be adjusted by adjusting the angle between the projection of the line connecting the center points of the focusing lenses 14 of two adjacent scribing mechanisms 1 onto the scribing plane 2 and the preset scribing direction.

[0057] According to one embodiment of the present invention, such as Figure 2 As shown, the laser scribing device includes multiple sets of scribing arrays. In each set of scribing arrays, the scribing intervals between the light source points 21 of two adjacent scribing mechanisms 1 are equal in the direction perpendicular to the scribing direction; the scribing intervals of multiple sets of scribing arrays are also equal. That is, the scribing intervals between two adjacent scribing mechanisms in the same scribing array are equal, and the scribing intervals of multiple scribing arrays are also equal.

[0058] like Figure 2 As shown, the line connecting the multiple light source points 21 in each group of closely spaced lines is a straight line, and the straight lines connecting the multiple light source points 21 in multiple groups of closely spaced lines are parallel to each other; any of the closely spaced lines forms a line projection on the scribing plane, and the shortest distance between two adjacent line projections is Z, Z≥L1; preferably, Z=L1, so that space can be better utilized and space utilization can be improved.

[0059] According to one embodiment of the present invention, such as Figure 4As shown, the laser source includes an optical fiber 15, and the light beam emitted from the optical fiber 15 is incident on the focusing lens 14. The laser source also includes a laser. Preferably, the laser is a semiconductor laser. The light beam generated by the semiconductor laser is transmitted through the optical fiber 15 and then incident on the focusing lens 14. After being focused by the focusing lens 14, a light source point 21 is formed on the scribing plane 2, and a line is scribed on the scribing plane 2 through the light source point 21.

[0060] like Figure 4 As shown in this application, the optical fiber 15 is perpendicular to the focusing lens 14, and the focusing lens 14 is parallel to the scribing plane 2. That is, the optical fiber 15 is perpendicular to the scribing plane 2. Simultaneously, the light beams entering the optical fibers 15 of each scribing mechanism 1 are consistent, the distances of the optical fibers 15 to the focusing lens 14 are consistent, and the distances of the focusing lens 14 to the scribing plane 2 are consistent. Therefore, it can be ensured that the light source points 21 formed by each scribing mechanism 1 on the scribing plane 2 form circular light spots, and the shape and size of the light spots (light source points 21) formed by each scribing mechanism 1 on the scribing plane 2 are uniform. Furthermore, in this application, the light beam emitted by the optical fiber 15 does not require a reflecting element and can directly pass through the focusing lens 14 to form the light source point 21 on the scribing plane 2, thus making the overall structure more compact; and because it does not rely on a reflecting element, power loss can be reduced to a certain extent.

[0061] According to one embodiment of the present invention, such as Figure 4 As shown, the scribing mechanism 1 also includes a collimating lens 13, which is disposed between the optical fiber 15 and the focusing lens 14. The light beam emitted from the optical fiber 15 is first collimated and magnified by the collimating lens 13, and then forms a light source point 21 on the scribing plane 2 by the focusing lens 14. Since the size of the light beam emitted from the optical fiber 15 and the required size of the light spot of the light source are usually inconsistent, for example, the size of the light beam emitted from the optical fiber 15 is 200μm, while the required size of the light spot of the light source point 21 is 80μm, if the collimating lens 13 is not provided, the size of the light spot on the scribing plane 2 after the light beam emitted from the optical fiber 15 passes through the focusing lens 14 will be 200μm, which cannot meet the requirements. Therefore, the scribing mechanism 1 in this application is a double lens structure, that is, the collimating lens 13 and the focusing lens 14 are arranged sequentially between the optical fiber 15 and the scribing plane 2. The size of the light beam emitted from the optical fiber 15 is collimated and compressed by the collimating lens 13, and then the light source point 21 (light spot) that meets the size requirements is formed on the scribing plane 2 by the focusing lens 14. It is understood that in some embodiments, the size of the optical fiber 15 can be adjusted by customizing the optical fiber 15. In this case, the scribing mechanism 1 can be a single lens structure, that is, only the focusing lens 14 is set and the collimating lens 13 is not set. It can also achieve the purpose of forming a light source point 21 that meets the size requirements on the scribing plane 2.

[0062] Optionally, the light emitted by the optical fiber 15 in this application may not be perpendicular to the focusing lens 14. That is, the light beam emitted by the optical fiber 15 is incident obliquely onto the focusing lens 14. As long as the light spot size formed on the scribing plane 2 after passing through the focusing lens 14 is uniform, the design concept of this invention can be realized and should fall within the protection scope of this invention.

[0063] In one embodiment, the focusing lenses 14 can be stacked vertically relative to the scribing plane, provided that the center point of any focusing lens 14 is not obstructed by other focusing lenses 14. That is, an optical fiber 15 is disposed above the focusing lens 14, and the light beam emitted by the optical fiber 15 is incident on the focusing lens 14, and then incident on the scribing plane 2 through the focusing lens 14 to form a light source point. When the focusing lenses 14 are stacked vertically relative to the scribing plane, the distance between the projection of the line connecting the center points of any two adjacent focusing lenses 14 onto the scribing plane 2 is not greater than the diameter of the focusing lens 14 (assuming the focusing lens 14 is circular). When the center point of one of any two adjacent focusing lenses 14 is infinitely close to the target straight line where the edge point of the other focusing lens 14 is located, the projection of the line connecting any two adjacent focusing lenses 14 onto the scribing plane 2 is also infinitely close to the radius of the focusing lens 14 (the edge point of the other focusing lens 14 mentioned here is the edge point closest to the center point of its adjacent focusing lens 14, and the target straight line is the straight line perpendicular to the scribing plane 2 where the edge point is located).

[0064] According to one embodiment of the present invention, such as Figure 4 As shown, the scribing mechanism 1 includes a fixed bracket. The optical fiber 15 and the focusing lens 14 are both fixed in the fixed bracket. By setting the fixed bracket, the components of each set of scribing mechanisms 1 can be formed as a whole. That is, the optical fiber 15, the collimating lens 13 and the focusing lens 14 can move synchronously. The relative position between two adjacent scribing mechanisms 1 can be easily adjusted, which is convenient for adjusting the size of α and thus adjusting the scribing interval.

[0065] like Figure 4 As shown, the fixed bracket is equipped with an optical fiber fixing component 12. The optical fiber 15 passes through the optical fiber fixing component 12 and is fixed to the fixed bracket by the optical fiber fixing component 12. The optical fiber fixing component 12 includes a fixing block, which is fixed to the fixed bracket. At the same time, the collimating lens 13 and the focusing lens 14 are also fixed to the fixed bracket. The fixing block has a through hole for the optical fiber 15 to pass through. The light-emitting end of the optical fiber 15 passes through the through hole and emits a light beam onto the collimating lens 13 or the focusing lens 14. Since the optical fiber fixing component 12, the focusing lens 14 and the collimating lens 13 are all fixed to the fixed bracket, the optical fiber 15, the collimating lens 13, the focusing lens 14 and the fixed bracket can be fixed as one unit, and the optical fiber 15, the collimating lens 13, the focusing lens 14 and the fixed bracket can move synchronously.

[0066] According to one embodiment of the present invention, such as Figure 4 As shown, the fixing bracket includes a sleeve 11, preferably a circular sleeve 11. The sleeve 11 is sleeved on the outside of the fiber optic fixing member 12, the collimating lens 13 and the focusing lens 14, wherein the inner walls of the fiber optic fixing member 12, the collimating lens 13 and the focusing lens 14 are connected.

[0067] According to another embodiment of the invention, such as Figure 5 , Figure 7 and Figure 8 As shown, the fixing bracket includes at least two fixing members, and the plurality of fixing members define an accommodating space 161; preferably, as Figure 7 As shown, the fixing member is a support rod 16, and at least two support rods 16 form an accommodating space 161. The optical fiber 15, the optical fiber fixing member 12, and the focusing lens 14 are all located within the accommodating space 161 and fixed by the support rods 16. The fixing member is located in the non-contact area of ​​two adjacent sets of the scribing mechanism 1, that is, no support rod 16 is provided between the two focusing lenses 14 of two adjacent sets of the scribing mechanism 1. In this application, the scribing mechanism 1 is configured as a structure surrounded by multiple support rods 16. Therefore, when the outer walls of two adjacent focusing lenses 14 can directly contact each other, that is, the distance between the two focusing lenses 14 of two adjacent scribing mechanisms 1 is equal to the sum of the radii of the two focusing lenses 14, the setting of the fixing bracket will not affect the scribing interval. If the fixed bracket is set as sleeve 11, the two focusing lenses 14 of the two adjacent scribing mechanisms 1 cannot directly contact each other, but the outer walls of the two sleeves 11 directly contact each other. At this time, the distance between the two adjacent focusing lenses 14 is greater than the sum of the radii of the two focusing lenses 14, which leads to an increase in scribing interval. Optionally, in this embodiment, the support rod 16 can be perpendicular to the scribing plane 2 or can be inclined relative to the scribing plane 2.

[0068] According to one embodiment of the present invention, such as Figures 6 to 8 As shown, the laser marking device also includes an adjustment mechanism 3, which can be connected to a fixed bracket or directly to a focusing lens 14, for adjusting the tilt angle α.

[0069] According to one embodiment of the present invention, such as Figure 6 As shown, the adjustment mechanism 3 includes an adjustment member 31 that clamps the fixed bracket, and the adjustment member 31 includes a fixing buckle corresponding to the fixed bracket; wherein, as Figure 6As shown, a receiving space 311 can be formed within the fixing buckle, and the fixing bracket is located within the receiving space 311 and fixed by the fixing buckle. Simultaneously, a driving component 32 is connected to the adjusting component 31, which can drive the adjusting component 31 to move, thereby adjusting the tilt angle α. In this embodiment, the adjusting mechanism 3 is used to drive the adjusting component 31 to move, thereby adjusting the position of the focusing lens 14 and thus adjusting the tilt angle α. Under the premise that the diameter of the focusing lens 14 remains unchanged, the scribing spacing can be adjusted.

[0070] In one embodiment, a retaining clip is connected to the sleeve 11, and the scribing mechanism 1 is adjusted by adjusting the position of the sleeve 11. To avoid increasing the initial gap between any two adjacent scribing mechanisms 1 (the initial gap is equal to the maximum length of the focusing lens 14, i.e., when the focusing lens 14 is circular, its maximum length is the diameter of the focusing lens 14), the sleeve 11 can be configured as an hourglass or conical shape. After the retaining clip is connected to the focusing lens, the gap between any two adjacent scribing mechanisms 1 remains the initial gap. If the sleeve 11 is hourglass-shaped, the retaining clip is connected to the waist of the sleeve 11 (i.e., the thinnest part of the hourglass structure). After the retaining clip is connected to the waist of the sleeve 11, the size of the circle containing the retaining clip is not greater than the size of the circle containing the sleeve 11, so as to avoid increasing the length of the line connecting the center points of any two adjacent focusing lenses 14.

[0071] In this embodiment, multiple sets of scribing mechanisms 1 are arranged sequentially along a preset scribing direction to form a scribing close-packed array. Correspondingly, the focusing lenses 14 of the multiple sets of scribing mechanisms 1 are arranged sequentially to form a focusing lens close-packed array. The projection of the line connecting the center points of multiple focusing lenses 14 in the same focusing lens close-packed array onto the scribing plane 2 is inclined relative to the preset scribing direction. The adjustment mechanism 3 includes an adjustment member 31. The adjustment member 31 in this application has multiple consecutive fixing buckles. The multiple fixing buckles are arranged inclinedly along an α-angle. Each fixing buckle fixes one focusing lens 14. The fixing buckles are arc-shaped, and the sleeve 11 can be embedded and fixed within the fixing buckle.

[0072] In this embodiment, the adjusting member 31 is a single unit and can be moved as a whole. Therefore, when it is necessary to adjust the angle between the projection of the line connecting the focusing lenses 14 on the scribing plane 2 and the preset scribing direction, one end of the adjusting member 31 can be fixed, and then the other end of the adjusting member 31 can be rotated by the driving member 32. At this time, the adjusting member 31 is equivalent to rotating around the fixed end by a certain angle, thus completing the adjustment of the tilt angle α of the scribing plane. By driving the adjusting member 31 once, the angle adjustment of multiple lenses can be achieved simultaneously.

[0073] According to another embodiment of the present invention, the adjustment mechanism 3 includes a plurality of adjustment members 31, which are arranged sequentially along the direction of the tilt angle α. Each adjustment member 31 is an independent fixing buckle, and an adjustment groove is formed in each fixing opening. A focusing lens 14 is embedded in each adjustment groove. Each adjustment member 31 corresponds to a driving member 32, which can be a support rod or a motor, etc. The position of each sleeve 11 is adjusted by driving the adjustment members 31, thereby adjusting the tilt angle α of the projection of the line connecting the center points of the plurality of sleeves 11 onto the scribing plane 2 relative to the preset scribing direction, and adjusting the scribing interval.

[0074] According to another embodiment of the invention, such as Figure 7 and Figure 8 As shown, the fixed bracket is a support rod 16 structure, and the adjustment mechanism 3 includes a connecting rod 33. Figure 7 and Figure 8 As shown, the fixed bracket of each scribing mechanism 1 includes three support rods 16. The three support rods 16 are inclined, and their upper ends are respectively connected to connecting rods 33. The three support rods 16 form a receiving space 161, in which the optical fiber 15, the optical fiber fixing member 12, the focusing lens 14, and the collimating lens 13 are located. At the same time, any two scribing mechanisms 1 are connected to a connecting rod 33 at their upper ends. To avoid interference from the connecting rod 33 in the entry of the optical fiber 15 into the receiving space 161, a wire-passing hole 331 is provided on the connecting rod 33. The size of the wire-passing hole 331 is similar to the size of the optical fiber 15, which can ensure that the optical fiber 15 can smoothly enter the receiving space and direct the beam to the focusing lens 14, while also limiting and fixing the optical fiber 15. When multiple scribing mechanisms 1 form a scribing array and the tilt angle α is adjusted, multiple connecting rods 33 can be fixedly connected. When the connecting rods 33 are rotated, the scribing array as a whole rotates by a certain angle, thereby adjusting the tilt angle α.

[0075] When multiple marking mechanisms 1 do not form a close-knit marking arrangement, any two marking mechanisms 1 are connected by a connecting rod 33 at their upper ends, and two adjacent connecting rods 33 are hinged together. At this time, the tilt angle of two adjacent marking mechanisms 1 can be adjusted by adjusting the angle between the two adjacent hinged connecting rods 33.

[0076] It is important to understand that the connecting rod 33 can also be used with a retaining ring to fix the fixed bracket. Each end of the connecting rod 33 has a retaining ring, which is fixed to the fixed bracket. Any connecting rod 33 is fixedly connected to one retaining ring and hinged to the other. For example, an adjustment mechanism 3 may include a first connecting rod, a first retaining ring, a second connecting rod, and a second retaining ring arranged sequentially. The first connecting rod is fixedly connected to the first retaining ring, the first retaining ring is hinged to the second connecting rod, and the second connecting rod is fixedly connected to the second retaining ring. This can be understood as any two fixedly connected connecting rods and the retaining ring forming a component. The adjustment mechanism 3 includes several components, and in any two adjacent components, the connecting rod of one component is hinged to the retaining ring of the other component.

[0077] One embodiment of the present invention also provides a laser scribing method. The laser scribing method provided by the present invention can use the scribing device provided in any of the above embodiments, or it can use other scribing devices other than those in this application.

[0078] The scribing method provided by the present invention includes the following steps: obtaining the projection length L2 of the line connecting the preset scribing interval L1 and the center points of two adjacent focusing lenses 14 on the scribing plane 2;

[0079] Based on the scribing interval L1 and the projection length L2, the inclination angle α between the projection of the line connecting the center points of two adjacent focusing lenses 14 onto the scribing plane 2 and the preset scribing direction is determined, where α = arcsin(L1 / L2).

[0080] After adjusting the scribing mechanism 1 based on the tilt angle α, a light source point 21 is formed on the scribing plane 2;

[0081] The scribing plane 2 is controlled to move along a preset scribing direction, and the light source point 21 moves relative to the scribing plane 2 to scribing.

[0082] According to one embodiment of the present invention, before obtaining the preset scribing interval L1 and the projection length L2 of the line connecting the center points of two adjacent focusing lenses 14 on the scribing plane 2, the method further includes: determining a safe distance K1 between the focusing lens 14 and the scribing plane 2; determining a distance K2 between the focusing lens 14 and the scribing plane, where K2 ≥ K1; and determining the size of the focusing lens based on the distance K2. In this embodiment, the safe distance K1 between the focusing lens 14 and the scribing plane 2 is determined first. The distance K2 between the fixed position of the focusing lens 14 and the scribing plane 2 needs to be greater than or equal to K1 to prevent impurities generated during the scribing process of the battery to be scribed from splashing onto the lens and causing contamination. Preferably, in this application, the focusing lens 14 is circular, and the radius of the focusing lens 14 is Q1, then Q1 ≤ L2 / 2.

[0083] When the scribing method provided in this embodiment uses the scribing device of the above embodiment, firstly, the preset scribing interval L1 and the projection length L2 of the line connecting the center points of two adjacent focusing lenses 14 on the scribing plane 2 are obtained; then, the tilt angle α is calculated, and multiple scribing mechanisms 1 are arranged sequentially according to the direction of α. The focusing lens distance K2 of the scribing mechanism is greater than or equal to K1; then, the adjustment mechanism 3 is adjusted so that multiple sets of scribing mechanisms 1 are arranged sequentially to form a dense scribing arrangement, and the tilt angle between the projection of the line connecting the center points of the multiple focusing lenses 14 in the dense scribing arrangement on the scribing plane 2 and the preset scribing direction is α. The laser source is turned on, and the beam emitted by the laser source passes through the corresponding focusing lens 14 to form a light source point 21 on the scribing plane 2; the scribing plane 2 is moved according to the preset scribing direction, and the light source point 21 moves relative to the scribing plane 2 to form a groove.

[0084] The scribing method provided by this invention can both set the focusing lens 14 to have a sufficient safe distance from the scribing plane 2 to avoid impurities generated during the scribing process from splashing onto the focusing lens 14 and causing contamination, and eliminate the need to adjust the size of the focusing lens 14. Only the size of the tilt angle α needs to be adjusted to adjust the scribing interval. On the one hand, it can avoid the focusing lens 14 being too large and occupying too much space. On the other hand, it can flexibly adjust the scribing interval, with a wider adjustment range and a wider range of applications.

[0085] The laser scribing method provided by this invention can employ the laser scribing device described in any of the above embodiments. In this application, multiple scribing mechanisms 1 can be arranged sequentially along the direction of the tilt angle α to form a scribing close-packed array. Since the focusing lens 14 and the optical fiber 15 in the scribing mechanism 1 can move synchronously, multiple optical fibers 15 form a close-packed array of optical fibers 15. A lens is provided for each optical fiber 15 in the close-packed array of optical fibers 15, and multiple lenses are combined to form a scribing close-packed array. Through the scribing close-packed array, multiple lines can be scribed on the scribing plane 2 at one time, improving scribing efficiency.

[0086] It should be noted that in this application, if Figure 3 As shown, multiple marking mechanisms 1 may not be arranged sequentially to form a dense marking pattern. In this case, when arranging the marking mechanisms 1, the line connecting the center points of two adjacent marking mechanisms 1 is symmetrical about the preset marking direction. The marking mechanisms 1 are arranged sequentially according to the above arrangement.

[0087] In the description of this invention, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0088] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A laser marking device, characterized in that, include: At least two scribing mechanisms (1) are provided. Each scribing mechanism (1) includes a laser source and a focusing lens (14). The laser source is used to emit laser light and direct it to the focusing lens (14). The focusing lens (14) focuses the laser light passing through it onto the scribing plane (2) to form a light source point (21). The angle between the projection of the line connecting the center points of the focusing lenses (14) of two adjacent sets of the scribing mechanism (1) onto the scribing plane (2) and the preset scribing direction is α, and the projection length of the line connecting the center points of two adjacent focusing lenses (14) onto the scribing plane (2) is L2. The distance between two adjacent light source points (21) in the direction perpendicular to the line is the line spacing L1, L1=sinα*L2; The marking mechanism (1) further includes a collimating lens (13), which is disposed between the laser source and the focusing lens (14); The laser source includes an optical fiber (15), and the light beam emitted from the optical fiber (15) is sequentially injected into the collimating lens (13) and the focusing lens (14). The marking mechanism (1) also includes a fixed bracket, and the optical fiber (15), the collimating lens (13) and the focusing lens (14) are all fixed to the fixed bracket; The fixed bracket includes a sleeve (11), which is sleeved on the outside of the optical fiber (15) and the focusing lens (14); Alternatively, the fixing bracket includes at least two support rods (16), and a plurality of the support rods (16) define an accommodating space (161), wherein the optical fiber (15) and the focusing lens (14) are both located in the accommodating space (161) and fixed by the support rods (16); The support rod (16) is disposed in the non-contact area of ​​the two adjacent sets of the marking mechanism (1); The laser marking device further includes an adjustment mechanism (3) for adjusting the tilt angle α; The adjustment mechanism (3) includes a connecting rod (33) disposed on a fixed bracket, two adjacent connecting rods (33) are hinged together, and the end of the connecting rod (33) is fixed to the fixed bracket; or, The adjustment mechanism (3) includes an adjustment member (31) that clamps the fixed bracket, and the adjustment member (31) includes an accommodating space (311) corresponding to the fixed bracket.

2. The laser marking device according to claim 1, characterized in that, Multiple sets of the marking mechanism (1) are arranged in sequence to form a dense marking pattern; The angle between the projection of the line connecting the center points of the multiple closely spaced focusing lenses (14) onto the scribe plane (2) and the preset scribe direction is α.

3. The laser marking device according to claim 2, characterized in that, The laser scribing device includes multiple sets of closely spaced scribing lines; In each group of the densely packed scribing array, the light source points (21) of two adjacent scribing mechanisms (1) have the same scribing interval perpendicular to the scribing direction; The spacing between the dabbles in the multiple sets of closely spaced dabbles is equal.

4. The laser marking device according to claim 3, characterized in that, The lines connecting the multiple light source points (21) arranged in close rows in each group are straight lines, and the straight lines connecting the multiple light source points (21) arranged in close rows in multiple groups are parallel to each other. Any of the scribed lines closely arranged form a line projection on the scribed plane, and the shortest distance between two adjacent line projections is Z, where Z≥L1.

5. The laser marking device according to claim 1, characterized in that, The focusing lenses (14) of the multiple scribing mechanisms (1) are stacked sequentially from bottom to top, and the size of the multiple focusing lenses (14) increases sequentially from bottom to top; The focusing lenses (14) of the multiple scribing mechanisms (1) are parallel to each other, and the projection of the upper focusing lens (14) onto the scribing plane does not cover the center of the projection of the adjacent lower focusing lens (14) onto the scribing plane (2).

6. A laser scribing method, characterized in that, The method is based on the laser scribing device described in any one of 1 to 5 above to scribing a line on the scribing plane (2), and the method includes the following steps: Obtain the projection length L2 of the line connecting the preset scribing interval L1 and the center points of two adjacent focusing lenses (14) on the scribing plane (2); Based on the scribing interval L1 and the projection length L2, the inclination angle α between the projection of the line connecting the center points of two adjacent focusing lenses (14) onto the scribing plane (2) and the preset scribing direction is determined, α = arcsin(L1 / L2). After adjusting the scribing mechanism (1) based on the tilt angle α, a light source point (21) is formed on the scribing plane (2). The control plane (2) moves along the preset line drawing direction, and the light source point (21) moves relative to the line drawing plane (2) to draw lines.

7. The laser scribing method according to claim 6, characterized in that, Before obtaining the projection length L2 of the line connecting the preset scribing interval L1 and the center points of two adjacent focusing lenses (14) on the scribing plane (2), the method further includes: Determine the safe distance K1 between the focusing lens (14) and the scribing plane (2); Determine the distance K2 between the focusing lens (14) and the scribing plane, where K2 ≥ K1; The size of the focusing lens is determined based on the distance K2.

8. The laser scribing method according to claim 7, characterized in that, The focusing lens (14) is circular, and the radius of the focusing lens (14) is Q1, then Q1≤L2 / 2.

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