Laser scribing device and laser scribing method

Abstract

The invention relates to the technical field of lasers, in particular to a laser scribing device and a laser scribing method. The laser scribing device provided by the invention comprises at least two groups of scribing mechanisms, wherein each scribing mechanism comprises a laser source and a focus lens; light beams emitted by the laser source form light source points on the scribing plane after passing through the focus lenses, the projection of a straight line of a connecting line of the center points of every two adjacent focus lenses falling on the scribing plane is obliquely arranged relative to the preset scribing direction, and the inclination angle is alpha, so that the scribing interval is not the length of the connecting line of the center points of the two focus lenses. Therefore, the scribing interval can be adjusted by adjusting the angle alpha; the focusing mirror can be arranged to have an enough safe distance from the scribing plane, impurities generated in the scribing process are prevented from being sputtered to the focusing mirror to pollute the focusing mirror, the size of the focusing mirror does not need to be adjusted, the scribing interval can be adjusted only by adjusting the angle alpha, the scribing interval can be flexibly adjusted, the adjustment range of the scribing interval is wider, and the scribing efficiency is improved. And the application range is wider.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to a laser scribing device and a laser scribing method. Background Art

[0002] During the battery cell preparation process, it is usually necessary to draw lines on the battery cell to form the required electrode pattern or separate different battery cells. Currently, mechanical etching, chemical etching or laser etching are usually used to draw lines on the battery cell.

[0003] Mechanical scribing can easily cause mechanical damage to the surface of the cell, which may lead to material deformation and cracks. Chemical etching is difficult to completely and evenly control due to factors such as solution distribution, concentration, and reaction time, resulting in different etching depths in different areas of the cell. In addition, chemical solutions are usually corrosive and may corrode other material components of the cell. Therefore, laser scribing is currently commonly used to scribing the surface of the cell.

[0004] In the laser scribing process, the light beam emitted by an optical fiber is focused by a focusing lens to form a light source point, which then falls on the cell's scribing surface. The position of the light source point is related to the size of the lens and the distance between the lens and the cell's scribing surface. When the lens is close to the cell to be scribed, impurities generated during the scribing process can splash onto the lens, contaminating it. Therefore, the lens needs to be a safe distance away from the cell's scribing surface. However, after meeting the required distance, to ensure that the light source point falls on the cell's scribing surface, the focusing lens size needs to be increased. Currently, the cell scribing process typically uses multiple light sources to simultaneously scribing the cell to increase scribing efficiency. During this process, multiple lenses are arranged in a row, with the line connecting the lenses perpendicular to the predetermined scribing direction. The minimum spacing between the scribing lines is the distance between the centers of the two lenses. In other words, the minimum spacing between the scribing lines is directly related to the lens size. To ensure a safe distance between the lens and the cell's scribing surface, the lens size needs to be increased. However, increasing the lens size results in a larger minimum spacing between the lines drawn by the optical fiber on the cell. Summary of the Invention

[0005] (1) The technical problem to be solved by the present invention is that in order to prevent impurities generated during the scribing process from splashing onto the lens and contaminating it, existing laser scribing equipment requires that there be a sufficient distance between the lens and the scribing plane, which results in a larger lens size and a larger scribing interval.

[0006] (2) Technical solution To solve the above technical problems, an embodiment of the present invention provides a laser scribing device, comprising: at least two scribing mechanisms, each comprising a laser source and a focusing mirror, wherein the laser source is configured to emit laser light and project it onto the focusing mirror, and the focusing mirror focuses the laser light passing through the laser source onto a scribing plane to form a light source point; The inclination angle between the projections of the center points of the focusing mirrors of two adjacent groups of the marking mechanisms on the marking plane and the preset marking direction is α, and the projection length of the line connecting the center points of the two adjacent focusing mirrors on the marking plane is L1; The distance between two adjacent light source points perpendicular to the line direction is the line interval L2, L1=sinα*L2.

[0007] According to one embodiment of the present invention, a plurality of groups of the scribing mechanisms are sequentially arranged to form a close-packed scribing arrangement; The inclination angle of the projection of the line connecting the center points of the multiple focusing lenses closely arranged on the scribing line on the scribing plane relative to the preset scribing direction is α.

[0008] According to one embodiment of the present invention, the laser scribing device includes a plurality of closely spaced scribing groups; The marking intervals between the light source points of two adjacent marking mechanisms in each group of closely spaced marking lines are equal in a direction perpendicular to the marking direction; The intervals between the multiple groups of closely packed score lines are all equal.

[0009] According to one embodiment of the present invention, the line connecting each group of the plurality of closely spaced light source points is a straight line, and the straight lines connecting the plurality of closely spaced light source points in the plurality of groups are parallel to each other; Any of the scribing lines are closely packed on the scribing plane to form line projections, and the shortest distance between two adjacent line projections is Z, where Z≥L1.

[0010] According to one embodiment of the present invention, the scribing mechanism further comprises a collimating lens, wherein the collimating lens is provided between the laser source and the focusing lens; And / or, the laser source includes an optical fiber, and the light beam emitted by the optical fiber is incident on the focusing mirror.

[0011] According to one embodiment of the present invention, the scribing mechanism further includes a fixed bracket, and the optical fiber and the focusing mirror are both fixed to the fixed bracket.

[0012] According to one embodiment of the present invention, the fixing bracket includes a sleeve, and the sleeve is sleeved outside the optical fiber and the focusing lens; 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 mirror are both located in the accommodating space; and the fixing members are arranged in the non-contact area of two adjacent groups of the scribing mechanisms.

[0013] According to one embodiment of the present invention, the laser scribing device further comprises an adjustment mechanism, wherein the adjustment mechanism is used to adjust the inclination angle α; Wherein, the adjustment mechanism includes a connecting rod provided on a fixed bracket, two adjacent connecting rods are hinged, and the ends of the connecting rods are fixed to the fixed bracket; And / or, the adjustment mechanism includes an adjustment piece for clamping the fixing bracket, and the adjustment piece includes a fixing buckle corresponding to the fixing bracket.

[0014] Another embodiment of the present invention provides a laser scribing method, wherein the laser scribing device according to any one of the above embodiments is used to scribble on a scribing plane, and the method comprises the following steps: Obtaining a preset marking interval L1 and a projection length L2 of a line connecting the center points of two adjacent focusing lenses on the marking plane; Based on the scribing interval L1 and the projection length L2, determining an inclination angle α between the projection of the line connecting the center points of two adjacent focusing mirrors on the scribing plane and a preset scribing direction, α=arcsin(L1 / L2); After adjusting the marking mechanism based on the inclination angle α, a light source point is formed on the marking plane; The marking plane is controlled to move along a preset marking direction, and the light source point moves relatively on the marking plane to perform marking.

[0015] 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 on the scribing plane, the method further includes: Determine the safety distance K1 between the focusing mirror and the marking plane; Determine the distance K2 between the focusing mirror and the scribing plane, K2 ≥ K1; The size of the focusing mirror is determined based on the distance K2.

[0016] According to one embodiment of the present invention, the focusing mirror (14) is circular, and the radius of the focusing mirror is Q1, then Q1≤L2 / 2.

[0017] Beneficial effects of the present invention: The laser scribing device provided by the present invention includes at least two groups of scribing mechanisms, and the scribing mechanisms include a laser source and a focusing mirror; the light beam emitted by the laser source forms a light source point on the scribing plane after passing through the focusing mirror, and the projection of the line connecting the center points of two adjacent focusing mirrors on the scribing plane is tilted relative to the preset scribing direction, and the tilt angle is α, so that the scribing interval is not the length of the line connecting the center points of the two focusing mirrors, and therefore the scribing interval can be adjusted by adjusting α; the focusing mirror can be set to have a sufficient safety distance from the scribing plane to prevent impurities generated during the scribing process from sputtering to the focusing mirror and contaminating it, and there is no need to adjust the size of the focusing mirror, and only α needs to be adjusted to adjust the scribing interval; on the one hand, the problem of large space occupied due to the excessive size of the focusing mirror can be avoided, and on the other hand, the scribing interval can be flexibly adjusted, and the adjustment range of the scribing interval is wider and the scope of application is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a laser scribing device is provided for one embodiment of the present invention; Figure 2 A schematic diagram of a laser scribing device provided in another embodiment of the present invention; Figure 3 A schematic structural diagram of a laser scribing device provided in yet another embodiment of the present invention; Figure 4 A schematic structural diagram of a marking mechanism provided in one embodiment of the present invention; Figure 5 A schematic structural diagram of a marking mechanism provided in another embodiment of the present invention; Figure 6 A schematic diagram of the cooperation between the adjustment mechanism and the marking mechanism is provided for one embodiment of the present invention; Figure 7 A schematic diagram of the cooperation between the adjustment mechanism and the marking mechanism provided in yet another embodiment of the present invention; Figure 8 A top view of the adjustment mechanism and the marking mechanism provided in yet another embodiment of the present invention.

[0020] Icons: 1- marking mechanism; 11- sleeve; 12- optical fiber fixing part; 13- collimating lens; 14- focusing lens; 15- optical fiber; 16- supporting rod; 161- accommodating space; 2- marking plane; 21- light source point; 3- adjusting mechanism; 31- adjusting part; 311- accommodating space; 32- driving part; 33- connecting rod; 331- wire hole. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] According to one embodiment of the present invention, Figures 1 to 8 As shown, the present invention provides a laser marking device, comprising: at least two groups of marking mechanisms 1, the marking mechanisms 1 comprising a laser source and a focusing mirror 14, the laser source being used to emit laser light and incident on the focusing mirror 14, the focusing mirror 14 focusing the laser light passing therethrough onto a marking plane 2 to form a light source point 21; the projection of a line connecting the center points of the focusing mirrors 14 of two adjacent groups of the marking mechanisms 1 falling on the marking plane 2 is tilted 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 mirrors 14 on the marking plane 2 is L2, that is, the distance between the center lines of the two adjacent focusing mirrors 14 is L2, the radius of the focusing mirror 14 is Q1, and the distance between the two adjacent light source points 21 perpendicular to the marking direction is the marking interval L1, L1=sinα*L2.

[0023] In the existing laser marking device, multiple marking mechanisms 1 are arranged in a row, and the centers of the focusing lenses 14 of the multiple marking mechanisms 1 are connected to form a straight line, which is perpendicular to the preset marking direction. Therefore, the marking interval is equal to the distance between two adjacent focusing lenses 14. In order to avoid impurities generated during the marking process from splashing onto the focusing lens 14 and causing contamination, the focusing lens 14 needs to be at a sufficient safety distance from the marking surface of the battery cell. While ensuring that the focusing lens 14 has a sufficient distance from the marking surface of the battery cell, in order to ensure that the light source point 21 falls on the marking plane 2, the size of the focusing lens 14 needs to be increased, which will cause the marking interval to become larger.

[0024] However, the multiple marking mechanisms 1 of the laser marking device provided in the present application are not arranged perpendicular to the preset marking direction, but the projection of the line connecting the center points of the focusing mirrors 14 of two adjacent groups of marking mechanisms 1 falling on the marking plane 2 is tilted relative to the preset marking direction, and the tilt angle is α. Therefore, the marking distance is not the distance between two adjacent focusing mirrors 14, and the marking interval L1=sinα*L2. Therefore, the marking interval can be changed by only changing the size of α, and the marking interval can be adjusted without increasing the size of the focusing mirror 14. The overall structure is more compact; and the marking interval can be flexibly adjusted according to the marking requirements, and the adjustment range of the marking interval is wider, and the scope of application is wider.

[0025] The laser marking device provided in the present application can mark on the marking plane 2 only through the marking mechanism 1 including the focusing mirror 14 and the laser source, without the need for other optical elements such as a refractive mirror. The laser source is focused on the marking plane 2 only through the focusing mirror 14 without passing through other optical elements, thereby avoiding unnecessary energy loss and reducing the complexity and physical size of the marking device. The more optical elements involved in the marking mechanism, the more sensitive the marking device is to changes in the external environment, the greater the challenge of maintaining the stability of the optical system, and the more optical elements the light passes through, the more multiple reflections of the light through the optical elements will cause the generation of stray light. This unexpected light will ultimately affect the marking quality and marking accuracy.

[0026] Among them, the relative positions of the laser source and the focusing mirror 14 included in each marking device in the present application are fixed. The laser source is arranged on the upper side of the focusing mirror 14 and emits laser light to the focusing mirror 14. The laser light is focused by the focusing mirror 14 to form a light source point 21 on the marking plane 2. The marking plane 2 is moved, and the light source point 21 marks a line on the marking plane 2. The center of the focusing mirror 14 (which can also be called a condenser or lens) in the present application 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 will theoretically not be deflected when passing through the lens, that is, the point where the main optical axis intersects with the lens. For example, in the present application, the focusing mirror 14 is a circular lens, and the distance between the center lines of two adjacent focusing mirrors 14 is equal to the sum of the radii of the two focusing mirrors 14.

[0027] like Figure 1 and 2As shown, in the laser marking device provided by the present invention, multiple groups of the marking mechanisms 1 are arranged in sequence to form a close-packed marking arrangement, and correspondingly, multiple groups of focusing lenses 14 of the marking mechanisms 1 are arranged in sequence to form a close-packed marking arrangement. The inclination angle between the projections of the center points of the multiple focusing lenses 14 of the close-packed marking arrangement on the marking plane 2 relative to the preset marking direction is α. In the present application, multiple marking mechanisms 1 are arranged in a row, so that multiple lines can be engraved on the marking plane 2 at one time, thereby improving the marking efficiency. During the marking process, it is preferred to complete the marking of the entire marking plane 2 in a preset direction at one time, so multiple groups of close-packed marking arrangements are set, and the marking operation of the entire marking plane 2 can be completed at one time through multiple groups of close-packed marking arrangements. Among them, the multiple focusing lenses 14 of the close-packed marking arrangement in the present application can be fitted together, or can be spaced apart from each other, or the multiple focusing lenses 14 can be fitted together and spaced apart from each other at the same time, that is, the marking intervals of two adjacent marking mechanisms 1 can be the same or different, and can be selected according to the marking requirements.

[0028] In this application, the scribing lines may be arranged in one group or in multiple groups, which needs to be determined according to the width of the scribing plane 2 perpendicular to the preset scribing direction. Figure 2 As shown, the width of the marking plane 2 perpendicular to the preset marking direction is too large, and one set of close markings cannot complete the marking operation for the entire marking plane 2. Therefore, multiple sets of close markings are set to complete the marking operation for the entire marking plane 2 in one marking operation.

[0029] According to one embodiment of the present invention, Figure 3 As shown, the marking mechanisms 1 are not arranged in a row, but the focusing mirrors 14 of every two adjacent marking mechanisms 1 are connected, and the straight line of the projection of the center points of the two adjacent focusing mirrors 14 falling on the marking plane 2 is inclined relative to the preset marking direction, which can also achieve the purpose of changing the marking interval by changing the inclination angle α and completing the marking operation of the entire marking plane 2 in one operation.

[0030] Preferably, in the present application, the structure and size of each scribing mechanism 1 are identical, that is, the size of the focusing mirror 14 of each scribing mechanism 1 is identical, the laser light emitted by the laser source is identical, and the distance between the laser source and the focusing mirror 14 is also identical. The focusing mirrors 14 of multiple scribing mechanisms 1 are located in the same plane. At this time, the laser sources of multiple scribing mechanisms 1 form light source points 21 on the scribing plane 2 after being focused by the focusing mirror 14, and the line connecting two adjacent light source points 21 is inclined relative to the preset scribing direction. In order to reduce the occupied space and shorten the scribing interval, it is preferred to connect the outer sides of the focusing mirrors 14 of two adjacent scribing mechanisms 1; when multiple groups of the scribing mechanisms 1 are connected in sequence to form a close scribing arrangement, the focusing mirrors 14 of each group of the scribing mechanisms 1 are connected in sequence to form a close scribing arrangement; and when multiple scribing mechanisms 1 are not arranged in a row to form a close scribing arrangement, the focusing mirrors 14 of two adjacent scribing mechanisms 1 are in contact with each other, and the line connecting the centers of the two adjacent focusing mirrors 14 is inclined.

[0031] According to another embodiment of the present invention, the sizes of the focusing mirrors 14 of the multiple marking mechanisms 1 are different. Since it is necessary to ensure that the laser emitted by the laser source of each marking mechanism 1 forms a light source point 21 on the marking plane 2 after being focused by the focusing mirror 14, the focusing mirrors 14 of different sizes are not located in the same plane; preferably, according to one embodiment of the invention, the sizes of the multiple focusing mirrors 14 increase successively, and the positions of the multiple focusing mirrors 14 in the vertical direction increase successively, which can also realize the formation of the light source point 21 on the marking plane 2, and at the same time, the marking interval can also be adjusted by adjusting the angle between the projection of the line connecting the center points of the focusing mirrors 14 of two adjacent marking mechanisms 1 on the marking plane 2 and the preset marking direction.

[0032] According to one embodiment of the present invention, Figure 2 As shown, the laser scribing device includes multiple groups of close scribing arrangements. In each group of close scribing arrangements, the scribing intervals between the light source points 21 of two adjacent scribing mechanisms 1 perpendicular to the scribing direction are equal. The scribing intervals of the multiple groups of close scribing arrangements are all equal. In other words, the scribing intervals of two adjacent scribing mechanisms in the same close scribing arrangement are equal, and the scribing intervals of multiple close scribing arrangements are also equal.

[0033] like Figure 2 As shown, the line connecting the multiple light source points 21 of each group of closely packed marked lines is a straight line, and the straight lines connecting the multiple light source points 21 of multiple groups of closely packed marked lines are parallel to each other; any closely packed marked lines form a line projection on the marked plane, and the shortest distance between two adjacent line projections is Z, Z≥L1; preferably, Z=L1, so that the space can be better utilized and the space utilization rate can be improved.

[0034] According to one embodiment of the present invention, Figure 4As shown, the laser source includes an optical fiber 15, and the light beam emitted by the optical fiber 15 is incident on the focusing lens 14, wherein the laser source also includes a laser. Preferably, the laser is a semiconductor laser, and the light beam generated by the semiconductor laser is transmitted through the optical fiber 15. The light beam passing through the optical fiber 15 is incident on the focusing lens 14, and after being focused by the focusing lens 14, a light source point 21 is formed on the marking plane 2, and a line is marked on the marking plane 2 through the light source point 21.

[0035] like Figure 4 As shown, in the present application, the optical fiber 15 is perpendicular to the focusing mirror 14, and the focusing mirror 14 is parallel to the marking plane 2, that is, the optical fiber 15 is perpendicular to the marking plane 2. At the same time, the light beams entering the optical fibers 15 of each marking mechanism 1 are consistent, the distances between the optical fibers 15 and the focusing mirror 14 are consistent, and the distances between the focusing mirror 14 and the marking plane 2 are consistent. Therefore, it is possible to ensure that the light source points 21 formed by each marking mechanism 1 on the marking plane 2 form circular light spots, and the light spots (light source points 21) formed by each marking mechanism 1 on the marking plane 2 are uniform in shape and size. At the same time, in the present application, the light beam emitted by the optical fiber 15 does not require the aid of a reflective element and can directly pass through the focusing mirror 14 to form the light source point 21 on the marking plane 2, so the overall structure is more compact; and because no reflective element is used, power loss can be reduced to a certain extent.

[0036] According to one embodiment of the present invention, Figure 4 As shown, the marking mechanism 1 also includes a collimator 13, which is arranged between the optical fiber 15 and the focusing lens 14. The light beam emitted by the optical fiber 15 is first collimated and amplified by the collimator 13, and then passes through the focusing lens 14 to form a light source point 21 on the marking plane 2; since the size of the light beam emitted by the optical fiber 15 and the spot size requirements of the light source are usually inconsistent, for example, the size of the light beam emitted by the optical fiber 15 is 200μm, and the required size of the light spot of the light source point 21 is 80μm, if the collimator 13 is not provided, the spot size of the light beam emitted by the optical fiber 15 after passing through the focusing lens 14 on the marking plane 2 is 200μm, which cannot meet the requirements. Therefore, the marking mechanism 1 in this application is a double-lens structure, that is, the collimator 13 and the focusing lens 14 are sequentially arranged between the optical fiber 15 and the marking plane 2, and the size of the light beam emitted by the optical fiber 15 is collimated and compressed by the collimator 13, and then formed on the marking plane 2 by the focusing lens 14 to meet the size requirements. The light source point 21 (light spot) is formed. It can be 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 marking mechanism 1 can be a single-lens structure, that is, only the focusing lens 14 is provided without the collimating lens 13, which can also meet the purpose of forming a light source point 21 that meets the size requirements on the marking plane 2.

[0037] Optionally, in the present application, the light emitted by the optical fiber 15 may not be perpendicular to the focusing mirror 14, that is, the light beam emitted by the optical fiber 15 is obliquely incident on the focusing mirror 14. It is only necessary to ensure that the spot size formed by the light beam after passing through the focusing mirror 14 on the marking plane 2 is uniform and consistent, and the design concept of the present invention can be realized, which should fall within the scope of protection of the present invention.

[0038] In one embodiment, the focusing mirrors 14 can be stacked vertically relative to the marking plane, and the center point of any focusing mirror 14 does not need to be blocked by other focusing mirrors 14, that is, an optical fiber 15 is provided above the focusing mirror 14, and the light beam emitted by the optical fiber 15 is incident on the focusing mirror 14, and is incident on the marking plane 2 through the focusing mirror 14 to form a light source point; when the focusing mirrors 14 are stacked vertically relative to the marking plane, the distance of the projection of the line connecting the center points of any two adjacent focusing mirrors 14 on the marking plane 2 is not greater than the diameter of the focusing mirror 14 (assuming that the focusing mirror 14 is circular); when the center point of one of any two adjacent focusing mirrors 14 is infinitely close to the target straight line where the edge point of the other focusing mirror 14 is located, the projection of the line connecting any two adjacent focusing mirrors 14 on the marking plane 2 is also infinitely close to the radius of the focusing 14 (the edge point of the other focusing mirror 14 mentioned here is the edge point closest to the center point of the adjacent focusing mirror 14, and the target straight line is the straight line perpendicular to the marking plane 2 where the edge point is located).

[0039] According to one embodiment of the present invention, Figure 4 As shown, the marking mechanism 1 includes a fixed bracket, and the optical fiber 15 and the focusing lens 14 are fixed in the fixed bracket. By setting the fixed bracket, the components of each group of the marking mechanism 1 can be formed into a whole, that is, the optical fiber 15, the collimating lens 13 and the focusing lens 14 can move synchronously, and the relative position between two adjacent marking mechanisms 1 can be conveniently adjusted, that is, it is convenient to adjust the size of α, and then adjust the marking interval.

[0040] like Figure 4 As shown, an optical fiber fixing part 12 is provided in the fixing bracket, and the optical fiber 15 passes through the optical fiber fixing part 12 and is fixed in the fixing bracket by the optical fiber fixing part 12, wherein the optical fiber fixing part 12 includes a fixing block, which is fixed on the fixing bracket, and the collimating mirror 13 and the focusing mirror 14 are also fixed on the fixing bracket, and a through hole for the optical fiber 15 to pass through is opened on the fixing block, and the light output end of the optical fiber 15 passes through the through hole and emits a light beam to the collimating mirror 13 or the focusing mirror 14; since the optical fiber fixing part 12, the focusing mirror 14 and the collimating mirror 13 are all fixed on the fixing bracket, the optical fiber 15, the collimating mirror 13, the focusing mirror 14 and the fixing bracket can be fixed as a whole, and the optical fiber 15, the collimating mirror 13, the focusing mirror 14 and the fixing bracket can be moved synchronously.

[0041] According to one embodiment of the present invention, Figure 4 As shown, the fixing bracket includes a sleeve 11, and preferably the sleeve 11 is a circular sleeve 11, which is sleeved on the outside of the optical fiber fixing member 12, the collimating lens 13 and the focusing lens 14, wherein the inner walls of the optical fiber fixing member 12, the collimating lens 13 and the focusing lens 14 are connected.

[0042] According to another embodiment of the present invention, Figure 5 、 Figure 7 and Figure 8 As shown, the fixing bracket includes at least two fixing members, and a plurality of the fixing members define an accommodating space 161 between them; preferably, as shown in FIG. Figure 7 As shown, the fixing member is a support rod 16, and an accommodating space 161 is formed between at least two support rods 16. The optical fiber 15, the optical fiber fixing member 12 and the focusing mirror 14 are all located in the accommodating space 161 and are fixed by the support rod 16. The fixing member is arranged in the non-contact area of the two adjacent groups of the marking mechanisms 1, that is, the support rod 16 is not arranged between the two focusing mirrors 14 of the two adjacent groups of the marking mechanisms 1. In the present application, the marking mechanism 1 is set as a structure surrounded by multiple support rods 16, so when the outer walls of the two adjacent focusing mirrors 14 can directly contact, that is, the distance between the two focusing mirrors 14 of the two adjacent marking mechanisms 1 is equal to the sum of the radii of the two focusing mirrors 14, so the setting of the fixing bracket will not affect the marking interval. However, if the fixed bracket is set as a sleeve 11, the two focusing mirrors 14 of two adjacent marking 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 mirrors 14 is greater than the sum of the radii of the two focusing mirrors 14, which leads to an increase in the marking interval; optionally, in this embodiment, the support rod 16 can be perpendicular to the marking plane 2, or can be set at an angle relative to the marking plane 2.

[0043] According to one embodiment of the present invention, Figures 6 to 8 As shown, the laser scribing device further includes an adjustment mechanism 3, which can be connected to a fixed bracket or directly connected to a focusing mirror 14, for adjusting the tilt angle α.

[0044] According to one embodiment of the present invention, Figure 6 As shown, the adjustment mechanism 3 includes an adjustment member 31 for clamping the fixed bracket, and the adjustment member 31 includes a fixing buckle corresponding to the fixed bracket; wherein, as Figure 6As shown, the fixing clip forms an accommodating space 311, and the fixing bracket is positioned within the accommodating space 311 and secured by the fixing clip. Furthermore, the adjusting member 31 is connected to a driving member 32, which drives the adjusting member 31 to adjust the inclination angle α. In this embodiment, an adjustment mechanism 3 is provided to drive the adjusting member 31, thereby adjusting the position of the focusing lens 14 to adjust the inclination angle α. This allows the line spacing to be adjusted while maintaining the diameter of the focusing lens 14.

[0045] In one embodiment, a fixed clip is connected to the sleeve 11, and the marking mechanism 1 is adjusted by adjusting the position of the sleeve 11. To prevent the initial spacing between any two adjacent marking mechanisms 1 from increasing (the initial spacing is equal to the maximum length of the focusing lens 14, i.e., when the focusing lens 14 is circular, its maximum length is equal to the diameter of the focusing lens 14), the sleeve 11 can be configured in an hourglass or conical shape. After the fixed clip is connected to the focusing lens, the spacing between any two adjacent marking mechanisms 1 remains the initial spacing. If the sleeve 11 is hourglass-shaped, the fixed clip is connected to the waist of the sleeve 11 (i.e., the thinnest part of the hourglass structure). After the fixed clip is connected to the waist of the sleeve 11, the size of the circle in which the fixed clip is located is no larger than the size of the circle in which the sleeve 11 is located, thereby preventing the fixed clip from increasing the length of the line connecting the center points of any two adjacent focusing lenses 14.

[0046] In this embodiment, multiple groups of the scribing mechanisms 1 are arranged in sequence along a preset scribing direction to form a close scribing arrangement. The corresponding multiple groups of focusing lenses 14 of the scribing mechanisms 1 are arranged in sequence to form a close scribing arrangement. The projection of the line connecting the center points of the multiple focusing lenses 14 in the same close scribing arrangement on the scribing plane 2 is tilted relative to the preset scribing direction. The adjustment mechanism 3 includes an adjustment member 31. The adjustment member 31 in this application is provided with multiple continuous fixing clips. The multiple fixing clips are tilted along an inclination angle α, and each fixing clip secures one of the focusing lenses 14. The fixing clips are arc-shaped, and the sleeve 11 can be embedded in the fixing clips for fixation.

[0047] In this embodiment, the adjustment member 31 is a single, movable unit. Therefore, to adjust the angle between the projection of the line connecting the focusing lenses 14 on the marking plane 2 and the predetermined marking direction, one end of the adjustment member 31 can be fixed, and the other end of the adjustment member 31 can be rotated by the drive member 32. This effectively rotates the adjustment member 31 around the fixed end by a certain angle, adjusting the inclination angle α of the marking line pack. A single actuation of the adjustment member 31 can simultaneously adjust the angles of multiple lenses.

[0048] According to another embodiment of the present invention, the adjustment mechanism 3 includes a plurality of adjustment parts 31, and the plurality of adjustment parts 31 are arranged in sequence along the direction of the inclination angle α. Each of the adjustment parts 31 is an independent fixing buckle, and an adjustment slot is formed in each fixing opening. A focusing lens 14 is embedded in each adjustment slot. Each of the adjustment parts 31 corresponds to a driving part 32, and the driving part 32 can be a support rod or a motor, etc., which adjusts the position of each of the sleeves 11 by driving the adjustment part 31, and then adjusts the inclination angle α of the projection of the line connecting the center points of the plurality of sleeves 11 on the marking plane 2 relative to the preset marking direction, thereby adjusting the marking interval.

[0049] According to another embodiment of the present invention, 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 fixing bracket of each scribing mechanism 1 includes three support rods 16, which are arranged at an angle. The upper ends of the three support rods 16 are respectively connected to the connecting rod 33. The three support rods 16 define a receiving space 161. The optical fiber 15, the optical fiber fixing member 12, the focusing lens 14, and the collimating lens 13 are located in the receiving space 161. At the same time, a connecting rod 33 is connected to the upper end of any two scribing mechanisms 1. To prevent the connecting rod 33 from interfering with the optical fiber 15 entering the receiving space 161, a wire hole 331 is provided on the connecting rod 33. The size of the wire hole 331 is comparable to that of the optical fiber 15. This ensures that the optical fiber 15 can smoothly enter the receiving space and the light beam is incident on the focusing lens 14, while also limiting and fixing the optical fiber 15. When multiple marking mechanisms 1 form a close-packed marking arrangement and adjust the angle of inclination α, multiple connecting rods 33 can be fixedly connected. When the connecting rod 33 is rotated, the entire close-packed marking arrangement rotates a certain angle to achieve adjustment of the inclination angle α.

[0050] When multiple marking mechanisms 1 are not closely packed, the upper ends of any two of the marking mechanisms 1 are connected to a connecting rod 33, and the two adjacent connecting rods 33 are hinged. At this time, the inclination angle of the two adjacent marking mechanisms 1 can be adjusted by adjusting the angle between the two adjacent hinged connecting rods 33.

[0051] It should be understood that the connecting rod 33 can also be fixedly connected to the fixed bracket in conjunction with a snap ring. A snap ring is provided at each end of the connecting rod 33, and the snap ring is fixed to the fixed bracket. Any connecting rod 33 is fixedly connected to one snap ring and hingedly connected to another snap ring. For example, a set of adjustment mechanisms 3 includes a first connecting rod, a first snap ring, a second connecting rod, and a second snap ring, which are arranged in sequence. The first connecting rod is fixedly connected to the first snap ring, the first snap ring is hingedly connected to the second connecting rod, and the second connecting rod is fixedly connected to the second snap ring. It can be understood that any two fixedly connected connecting rods and the open ring constitute an assembly. The adjustment mechanism 3 includes multiple assemblies, and the connecting rod of one of any two adjacent assemblies is hingedly connected to the snap ring of the other assembly.

[0052] One aspect of the present invention further provides a laser scribing method. The laser scribing method provided by the present invention may use the scribing device provided by any of the above embodiments, or may use other scribing devices other than those in the present application.

[0053] The scribing method provided by the present invention comprises the following steps: obtaining a preset scribing interval L1 and a projection length L2 of a line connecting 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, an inclination angle α between the projection of the line connecting the center points of two adjacent focusing mirrors 14 on the scribing plane 2 and a preset scribing direction is determined, where α=arcsin(L1 / L2); After adjusting the marking mechanism 1 based on the inclination angle α, a light source point 21 is formed on the marking plane 2; The marking plane 2 is controlled to move along a preset marking direction, and the light source point 21 moves relatively on the marking plane 2 to perform marking.

[0054] According to one embodiment of the present invention, before obtaining the preset marking interval L1 and the projection length L2 of the line connecting the center points of two adjacent focusing mirrors 14 on the marking plane 2, the method further includes: determining a safety distance K1 between the focusing mirror 14 and the marking plane 2; determining a distance K2 between the focusing mirror 14 and the marking plane, K2 ≥ K1; and determining the size of the focusing mirror based on the distance K2. In this embodiment, the safety distance K1 between the focusing mirror 14 and the marking plane 2 is first determined, and the distance K2 between the fixed position of the focusing mirror 14 and the marking plane 2 needs to be greater than or equal to K1 to prevent impurities generated during the marking process of the battery to be marked from sputtering onto the lens and causing contamination. Preferably, in the present application, the focusing mirror 14 is circular, and the radius of the focusing mirror 14 is Q1, then Q1 ≤ L2 / 2.

[0055] When the marking method provided in this embodiment uses the marking device of the above embodiment, the preset marking interval L1 and the projection length L2 of the line connecting the center points of two adjacent focusing mirrors 14 on the marking plane 2 are first obtained; then the inclination angle α is calculated, and multiple marking mechanisms 1 are arranged in sequence according to the direction of α. The focusing mirror distance K2 of the marking mechanism is ≥ K1; then the adjustment mechanism 3 is adjusted so that multiple groups of marking mechanisms 1 are arranged in sequence to form a close-packed marking arrangement, and the inclination angle between the projections of the line connecting the center points of the multiple focusing mirrors 14 in the close-packed marking arrangement on the marking plane 2 relative to the preset marking direction is α. The laser source is turned on, and the light beam emitted by the laser source passes through the corresponding focusing mirror 14 to form a light source point 21 on the marking plane 2; the marking plane 2 is moved according to the preset marking direction, and the light source point 21 moves relative to the marking plane 2 to form a line groove.

[0056] In the marking method provided by the present invention, the focusing mirror 14 can be set to have a sufficient safety distance from the marking plane 2 to avoid impurities generated during the marking process from splashing onto the focusing mirror 14 and contaminating it. There is no need to adjust the size of the focusing mirror 14. Only the size of the inclination angle α needs to be adjusted to adjust the marking interval. On the one hand, it can avoid the focusing mirror 14 being too large and occupying a large space. On the other hand, the marking interval can be flexibly adjusted, and the adjustment range of the marking interval is wider and the scope of application is wider.

[0057] The laser scribing method provided by the present invention can employ the laser scribing device described in any of the above embodiments. In this application, multiple scribing mechanisms 1 can be arranged in sequence along the direction of the inclination angle α to form a close scribing arrangement. Since the focusing mirror 14 and the optical fiber 15 in the scribing mechanism 1 can move synchronously, the multiple optical fibers 15 form a close scribing arrangement of optical fibers 15. A lens is provided for each optical fiber 15 in the close scribing arrangement of optical fibers 15, and the multiple lenses are combined to form a close scribing arrangement. The close scribing arrangement can be used to engrave multiple lines on the scribing plane 2 at one time, thereby improving the scribing efficiency.

[0058] It should be noted that in this application, Figure 3 As shown, the multiple marking mechanisms 1 may not be arranged in sequence to form a dense marking arrangement. In this case, when arranging the marking mechanisms 1, among three adjacent marking mechanisms 1, the line connecting the center points of two adjacent marking mechanisms 1 is symmetrical about the preset marking direction, and the marking mechanisms 1 are arranged in sequence according to the above arrangement.

[0059] In the description of the present invention, it should be noted that the terms "upper" and "lower" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to connections between the internal parts of two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0061] 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 in the scope of protection of the present invention.

Claims

1. A laser scribing device, characterized in that: include: At least two groups of scribing mechanisms (1), the scribing mechanisms (1) comprising a laser source and a focusing mirror (14), the laser source being used to emit laser light and incident on the focusing mirror (14), the focusing mirror (14) focusing the laser light passing through the laser source onto the scribing plane (2) to form a light source point (21); The inclination angle between the projections of the center points of the focusing mirrors (14) of two adjacent groups of the marking mechanisms (1) on the marking plane (2) relative to the preset marking direction is α, and the projection length of the line connecting the center points of the two adjacent focusing mirrors (14) on the marking plane (2) is L2; The distance between two adjacent light source points (21) perpendicular to the line direction is the line spacing L1, where L1 = sinα*L2.

2. The laser scribing device according to claim 1, wherein: Multiple groups of the marking mechanisms (1) are arranged in sequence to form a dense arrangement of markings; The inclination angle between the projections of the line connecting the center points of the plurality of closely spaced focusing mirrors (14) on the marking plane (2) and the preset marking direction is α.

3. The laser scribing device according to claim 2, wherein: The laser scribing device includes a plurality of closely spaced scribing groups; The marking intervals between the light source points (21) of two adjacent marking mechanisms (1) in each group of closely spaced marking lines are equal in a direction perpendicular to the marking direction; The intervals between the multiple groups of closely packed score lines are all equal.

4. The laser scribing device according to claim 3, characterized in that: The line connecting each group of the plurality of closely spaced light source points (21) is a straight line, and the straight lines connecting the plurality of closely spaced light source points (21) are parallel to each other; Any of the scribing lines are closely packed on the scribing plane to form line projections, and the shortest distance between two adjacent line projections is Z, where Z≥L1.

5. The laser scribing device according to claim 1, wherein: The marking mechanism (1) further comprises a collimating mirror (13), wherein the collimating mirror (13) is arranged between the laser source and the focusing mirror (14); And / or, the laser source includes an optical fiber (15), and the light beam emitted by the optical fiber (15) is incident on the focusing mirror (14).

6. The laser scribing device according to claim 5, characterized in that: The marking mechanism (1) further comprises a fixed bracket, and the optical fiber (15) and the focusing lens (14) are both fixed to the fixed bracket.

7. The laser scribing device according to claim 6, characterized in that: The fixing bracket comprises a sleeve (11), and the sleeve (11) is sleeved on the outside of the optical fiber (15) and the focusing lens (14); And / or, the fixing bracket includes at least two fixing members, a plurality of the fixing members define an accommodating space (161), and the laser source and the focusing mirror (14) are both located in the accommodating space (161); The fixing member is arranged in the non-contact area of two adjacent groups of the marking mechanisms (1).

8. The laser scribing device according to claim 7, characterized in that: The laser marking device further comprises an adjustment mechanism (3), wherein the adjustment mechanism (3) is used to adjust the inclination angle α; The adjustment mechanism (3) comprises a connecting rod (33) arranged on a fixed bracket, two adjacent connecting rods (33) are hinged, and the ends of the connecting rods (33) are fixed to the fixed bracket; and / or, The adjustment mechanism (3) comprises an adjustment member (31) for clamping the fixed bracket, and the adjustment member (31) comprises an accommodating space (311) arranged corresponding to the fixed bracket.

9. A laser scribing method, characterized in that: The method is based on marking a line on a marking plane (2) using the laser marking device as described in any one of items 1 to 8 above, and the method comprises the following steps: Obtaining a preset marking interval L1 and a projection length L2 of a line connecting the center points of two adjacent focusing mirrors (14) on the marking plane (2); Based on the marking interval L1 and the projection length L2, determining an inclination angle α between the projection of the line connecting the center points of two adjacent focusing mirrors (14) on the marking plane (2) and a preset marking direction, α=arcsin(L1 / L2); After adjusting the marking mechanism (1) based on the inclination angle α, a light source point (21) is formed on the marking plane (2); The marking plane (2) is controlled to move along a preset marking direction, and the light source point (21) moves relatively on the marking plane (2) to perform marking.

10. The laser scribing method according to claim 9, wherein: Before obtaining the preset marking interval L1 and the projection length L2 of the line connecting the center points of two adjacent focusing mirrors (14) on the marking plane (2), the method further comprises: Determining a safety distance K1 between the focusing mirror (14) and the marking plane (2); Determine the distance K2 between the focusing mirror (14) and the marking plane, K2 ≥ K1; The size of the focusing mirror is determined based on the distance K2.

11. The laser scribing method according to claim 10, wherein: The focusing mirror (14) is circular, and the radius of the focusing mirror (14) is Q1, so Q1≤L2 / 2.

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