Visual positioning device for laser welding and visual positioning detection method

Abstract

The invention discloses a visual positioning device and a visual positioning detection method for laser welding, and belongs to the technical field of batteries to be welded, the visual positioning device comprises a mounting platform, a positioning assembly arranged on the mounting platform, a support, a scanning image laser welding machine mounted on the support, a limiting piece with a limiting center hole, and a position adjusting assembly, the positioning assembly is used for bearing and positioning a battery to be welded; the scanning image laser welding machine comprises an image acquisition module and a laser welding module; the position adjusting assembly is in sliding connection with the support, the limiting piece is detachably connected with the position adjusting assembly, and the limiting piece is driven by the position adjusting assembly to move in the direction close to or away from the pole of the battery to be welded so that the limiting center hole can be aligned with the pole of the battery to be welded; the controller is in communication connection with the image acquisition module and the laser welding module. According to the invention, the technical effects of improving the welding quality, improving the efficiency and improving the adaptability in the process of welding the pole and the bar of the battery are achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of battery, and particularly relates to a visual positioning device for laser welding and a visual positioning detection method. BACKGROUND

[0002] In the process of battery manufacturing, laser welding is a key process for connecting the pole column and the tab sheet of the battery. In the prior art, the battery is usually placed on the working platform of the laser welding machine before welding, and then the laser head is moved by a servo motor mechanism or an operator holds a laser welding tool to sequentially weld the tab sheet of the battery. After welding, the battery is taken out and transferred to the subsequent electrical performance test station. However, the number of welding points between the tab sheet and the pole column is large and densely arranged, and there is a small height difference and uneven roughness on the surface of the pole column, which makes it difficult to adapt to the welding of different pole column shapes and tab sheets, and the adaptability of welding is poor. The servo motor mechanism or the operator is prone to error accumulation during work, and the laser head is prone to walking deviation during movement, which leads to inaccurate welding position, affects the welding strength and consistency, and the movement speed is slow, which cannot meet the needs of efficient production, and the production efficiency is low.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. SUMMARY

[0004] The technical problem to be solved by the present application is the poor welding quality, low efficiency and poor adaptability in the process of welding the pole column and the tab sheet of the battery.

[0005] To solve the above technical problems, the present application provides a visual positioning device for laser welding, which comprises a mounting platform, a positioning assembly arranged on the mounting platform, a bracket, a scanning image laser welding machine mounted on the bracket, a limiting piece with a limiting center hole, a position adjusting assembly, and a controller. The positioning assembly is used to carry and position the battery to be welded. The scanning image laser welding machine comprises an image acquisition module and a laser welding module. The position adjusting assembly is in sliding connection with the bracket, and the limiting piece is in detachable connection with the position adjusting assembly. The position adjusting assembly drives the limiting piece to move towards or away from the direction of the pole column of the battery to be welded, so that the limiting center hole is aligned with the pole column of the battery to be welded. The controller is in communication connection with the image acquisition module and the laser welding module respectively. The controller is configured to: receive the surface feature information of the pole column acquired by the image acquisition module through the limiting center hole, wherein the surface feature information comprises the surface image of the pole column and the surface roughness information of the pole column; identify the actual contour of the pole column based on the surface image to generate a welding track; and control the laser welding module to perform laser welding on the pole column based on the welding track.

[0006] Optionally, the visual positioning device further comprises an information conveying end mounted on the support, the information conveying end being electrically connected with the image acquisition module and the laser welding module respectively, and the controller being in communication connection with the information conveying end.

[0007] Optionally, the visual positioning device further comprises a display mounted on the mounting platform, the display being electrically connected with the information conveying end, and the display being used for displaying the surface image of the pole.

[0008] Optionally, the position adjusting assembly comprises a sliding rail mounted on the support, a position adjusting plate in sliding connection with the sliding rail, a limiting block mounted on the position adjusting plate, and a fixing block in elastic connection with the limiting block, the sliding rail being arranged in a direction perpendicular to the mounting platform; the fixing block is detachably connected with the limiting member, and the position adjusting plate drives the limiting block and the fixing block to move towards or away from the pole.

[0009] Optionally, the position adjusting assembly further comprises an elastic member, the elastic member being connected with the limiting block and the fixing block respectively.

[0010] According to another aspect of the present application, the present application further provides a visual positioning detection method for laser welding, the visual positioning detection method comprising the visual positioning device, further comprising placing a battery to be welded on a positioning assembly for fixation, and making a pole of the battery to be welded face a scanning image laser welding machine, the scanning image laser welding machine comprising an image acquisition module and a laser welding module; driving a limiting member to move towards the pole, so that a limiting center hole on the limiting member is sleeved on an outer periphery of the pole; the image acquisition module acquires surface feature information of the pole through the limiting center hole, the surface feature information comprising a surface image of the pole and surface roughness information of the pole; a controller identifies an actual contour of the pole according to the surface feature information, and generates a welding track; the laser welding module performs laser welding on the pole based on the welding track.

[0011] Optionally, the step of identifying the actual contour of the pole according to the surface feature information by the controller, and generating the welding track comprises: performing edge detection on the surface image to extract the actual contour of the pole; simulating a welding path in a virtual coordinate system based on the actual contour and preset welding parameters; correcting power distribution of the welding path according to the surface roughness information to generate a final track file.

[0012] Optionally, the laser welding module laser welding the pole based on the welding trajectory comprises that the laser welding module receives the final trajectory file to perform laser welding on the pole by the laser welding module.

[0013] Optionally, the limiting center hole on the limiting piece is sleeved on the outer periphery of the pole, and the limiting piece and the pole adopt flexible contact when the limiting center hole is sleeved on the pole.

[0014] Optionally, the visual positioning detection method further comprises: transmitting the surface image to a display through an information transmission port to display the image of the pole of the battery to be welded on the display in real time.

[0015] Advantages:

[0016] The application provides a visual positioning device for laser welding. The positioning assembly is arranged on the mounting platform, and the positioning assembly can carry and position the battery to be welded. The scanning image laser welding machine is mounted on the support. The limiting piece has a limiting center hole. The position adjusting assembly is in sliding connection with the support. The limiting piece is detachably connected with the position adjusting assembly. The position adjusting assembly drives the limiting piece to move towards the pole of the battery to be welded to align the limiting center hole with the pole of the battery to be welded. The controller is in communication connection with the image acquisition module and the laser welding module. The controller can receive the surface feature information of the pole acquired by the image acquisition module through the limiting center hole. The surface feature information comprises the surface image of the pole and the surface roughness information of the pole. The actual contour of the pole is identified according to the surface image to generate a welding trajectory. Then, the laser welding module laser welds the pole based on the welding trajectory. In this way, the position adjusting assembly drives the limiting piece to move above the pole, so that the limiting center hole is aligned with the matched pole. The image acquisition module acquires the surface feature information of the pole through the limiting center hole and transmits the surface feature information to the controller. The controller identifies the actual contour according to the surface feature information and generates a welding trajectory. Then, the laser welding module can perform welding according to the welding trajectory. In turn, the welding of the pole and the tab with different surface morphologies can be adapted, and the welding precision and welding speed are improved. Thus, the welding quality, efficiency and adaptability are improved in the process of welding the pole and the tab of the battery to be welded. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 A structural schematic diagram of a visual positioning device for laser welding is provided for an embodiment of the present application.

[0019] Figure 2 A structural block diagram of an image acquisition module, a laser welding module, a controller and the laser welding module in a visual positioning device for laser welding is provided for an embodiment of the present application.

[0020] Figure 3 A flowchart of a visual positioning detection method for laser welding is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below are exemplary only, and are used only for explaining the present application, and cannot be understood as limiting the present application.

[0022] In order to make the technical personnel in the art better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In the embodiments of the present application, at least one means one or more, and multiple means two or more than two. In the description of the present application, the terms "first", "second", "third" and the like are only used for distinguishing the purposes of description, and cannot be understood as indicating or implying relative importance, nor indicating or implying sequence.

[0024] In the present specification, the reference "an embodiment" or "some embodiments" and the like means that a specific feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Therefore, the terms "include", "contain", "have" and their variants in the present specification mean "include but not limited to", unless otherwise specifically emphasized. It should be noted that in the embodiments of the present application, the "and / or" description of the associated objects represents that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone.

[0025] It should be noted that in the embodiments of the present application, when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be an intermediate component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be an intermediate component. When a component is referred to as being "disposed" on another component, it can be directly on the other component or there can be an intermediate component. Meanwhile, "connection" in the embodiments of the present application can also be understood as electrical connection, and the connection between two electrical elements can be direct or indirect. For example, A and B are connected, which can mean that A and B are directly connected, or A and B are indirectly connected through one or more other electrical elements. The terms "vertical", "horizontal", "left", "right" and the like used in the embodiments of the present application are for illustrative purposes only and are not intended to limit the present application.

[0026] An embodiment of the present application provides a visual positioning device for laser welding, please refer to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of a visual positioning device for laser welding provided by an embodiment of the present application, Figure 2 is a structural block diagram of an image acquisition module, a laser welding module, a controller and the laser welding module in a visual positioning device for laser welding provided by an embodiment of the present application. The visual positioning device for laser welding provided by an embodiment of the present application comprises a mounting platform 1, a positioning assembly 2, a support 3, a scanning image laser welding machine 4, a limiting piece 5, a position adjusting assembly 6 and a controller 7. The positioning assembly 2 is arranged on the mounting platform 1, and the positioning assembly 2 is used for carrying and positioning a battery to be welded 10. The scanning image laser welding machine 4 is installed on the support 3, and the scanning image laser welding machine 4 comprises an image acquisition module 41 and a laser welding module 42. The limiting piece 5 has a limiting center hole 51. The position adjusting assembly 6 is in sliding connection with the support 3. The limiting piece 5 is in detachable connection with the position adjusting assembly 6. The limiting piece 5 is driven by the position adjusting assembly 6 to move towards the direction of approaching or moving away from the pole 101 of the battery to be welded 10, so that the limiting center hole 51 is aligned with the pole 101 of the battery to be welded 10. The controller 7 is in communication connection with the image acquisition module 41 and the laser welding module 42 respectively. The controller 7 is configured to receive surface feature information of the pole 101 acquired by the image acquisition module 41 through the limiting center hole 51. The surface feature information comprises a surface image 11 of the pole 101 and surface roughness information of the pole 101. The actual contour of the pole 101 is identified according to the surface image 11 to generate a welding track. The laser welding module 42 is controlled to perform laser welding on the pole 101 based on the welding track.

[0027] The mounting platform 1 can include a metal base, the battery 10 to be welded can be a square aluminum shell power battery, the positioning assembly 2 can include two positioning plates connected with each other, and the two positioning plates are perpendicular to the mounting platform 1, that is, the two positioning plates and the mounting platform 1 form a positioning area, which can make the pole piece of the battery 10 to be welded placed in the positioning area and the limiting center hole 51 be located on the same straight line. After the battery 10 to be welded is placed in the positioning area and the two adjacent side walls of the battery 10 to be welded are tightly attached to the corresponding positioning plates, the positioning and support of the battery 10 to be welded are completed. In addition, a vacuum suction platform can be arranged in the bottom area between the other two positioning plates to constrain the spatial position of the battery 10 to be welded.

[0028] The limiting part 5 and the position adjusting assembly 6 can be detachably connected, for example, the limiting part 5 and the position adjusting assembly 6 are connected by bolts, clamps or magnetic attraction. By driving the position adjusting assembly 6, for example, by motor driving or manual fine adjustment, the limiting part 5 can be moved along the vertical direction to the direction of approaching or moving away from the top pole 101 of the battery 10 to be welded, until the limiting center hole 51 of the limiting part 5 is aligned above the target pole 101 of the battery 10 to be welded, or the pole 101 of the battery 10 to be welded is inserted into the limiting center hole 51. For different sizes of the pole 101, corresponding limiting parts 5 can be installed in advance. For example, when a larger size of the pole 101 needs to be welded, a limiting part 5 with a larger inner diameter of the limiting center hole 51 can be installed in advance, so that the larger inner diameter of the limiting center hole 51 matches the larger size of the pole 101. When a smaller size of the pole 101 needs to be welded, a limiting part 5 with a smaller inner diameter of the limiting center hole 51 can be installed in advance, so that the smaller inner diameter of the limiting center hole 51 matches the smaller size of the pole 101. By replacing the corresponding limiting part 5, the pole 101 to be welded can be matched.

[0029] The image acquisition module 41 can include an industrial CCD camera and a laser confocal sensor. The lens optical axis of the CCD camera is coaxial with the laser optical axis of the laser welding module 42. The laser confocal sensor can calculate the micro-height variation of the surface of the pole 101 by emitting a focused light beam and receiving the phase difference of the reflected light. The laser welding module 42 can include a fiber laser or a galvanometer scanning laser welding head.

[0030] The bracket 3 can be connected with a six-axis robot to realize the movement of the bracket 3 position, so that the bracket 3 moves from above one pole 101 to above another pole 101, or the bracket 3 can be fixedly installed on a machine table in the welding site, and the position of the bracket 3 is pre-adjusted so that the limiting center hole 51 can be moved to a position aligned with the pole 101 of the battery 10 to be welded. The limiting center hole 51 is aligned with the pole 101 of the battery 10 to be welded, which means that the limiting center hole 51 can be lowered to the position of inserting the pole 101 into the limiting center hole 51. The position adjusting assembly 6 can also include a servo motor, a ball screw and a sliding block mounted on the bracket 3. The sliding block is in sliding connection with a linear guide rail mounted on the bracket 3, and the ball screw is connected with the sliding block. The limiting piece 5 is installed at the lower end of the sliding block through a quick release pin, and the servo motor can drive the ball screw to drive the sliding block and the limiting piece 5 to move up and down.

[0031] The limiting piece 5 can also integrate a pressure sensor. When the limiting piece 5 contacts the battery 10 to be welded, if the pressure on the battery 10 to be welded exceeds a preset threshold, an alarm can be automatically triggered, or a feedback signal can be sent to the servo motor to stop working, so as to prevent the deformation of the shell of the battery 10 to be welded. The controller 7 can include an industrial PLC or an embedded computer system, and can be in communication connection with the image acquisition module 41 and the laser welding module 42 through a data cable or a wireless communication mode. The controller 7 is programmed and configured to perform the following functions: receiving the surface feature information of the pole 101 obtained by the image acquisition module 41 through the aligned limiting center hole 51, which includes clear surface image 11 and surface roughness measurement data of the pole 101, then the controller 7 identifies the actual edge profile of the pole 101 according to the received surface image 11, and generates an optimized laser welding trajectory according to the actual edge profile of the pole 101. The laser welding trajectory can include welding start and end points, path and energy distribution. Then the controller 7 controls the laser welding module 42 to drive the laser beam of the laser welding module 42 to weld the pole 101 of the battery 10 to be welded according to the generated welding trajectory, that is, to perform laser welding operation on the pole 101 and the tab in contact with the pole 101.

[0032] The image acquisition module 41 in the controller 7 can perform high-resolution imaging on the area of the pole 101 directly below the limiting center hole 51. Not only can it capture clear surface two-dimensional images for contour recognition, but also can obtain micro-height variation information of the surface of the pole 101 through confocal measurement to calculate the surface roughness feature information of the pole 101.

[0033] In the embodiment, the positioning assembly 2 is arranged on the mounting platform 1, the positioning assembly 2 can carry and position the battery 10 to be welded, the scanning image laser welding machine 4 is mounted on the support 3, the limiting piece 5 is provided with a limiting center hole 51, the position adjusting assembly 6 is slidably connected with the support 3, the limiting piece 5 is detachably connected with the position adjusting assembly 6, the limiting piece 5 is driven by the position adjusting assembly 6 to move towards the direction of approaching or moving away from the pole 101 of the battery 10 to be welded, so that the limiting center hole 51 is aligned with the pole 101 of the battery 10 to be welded, the controller 7 is in communication connection with the image acquisition module 41 and the laser welding module 42 respectively, the surface feature information of the pole 101 obtained by the image acquisition module 41 through the limiting center hole 51 can be received by the controller 7, the surface feature information includes the surface image 11 of the pole 101 and the surface roughness information of the pole 101, the actual contour of the pole 101 is identified according to the surface image 11 to generate a welding track, and then the laser welding module 42 controls the laser welding of the pole 101 based on the welding track. In this way, the limiting piece 5 is moved above the pole 101 by the position adjusting assembly 6, so that the limiting center hole 51 is aligned with the matched pole 101, the image acquisition module 41 obtains the surface feature information of the pole 101 through the limiting center hole 51 and transmits it to the controller 7. The actual contour is identified according to the surface feature information, and the welding track is generated, and then the laser welding module 42 can perform welding according to the welding track. Then the welding of the pole 101 with different surface forms and the tab can be adapted, the welding precision and the welding speed are improved. Thus, the welding quality, the efficiency and the adaptability are improved in the process of welding the pole 101 and the tab of the battery 10 to be welded.

[0034] As an embodiment, the visual positioning device for laser welding provided by the embodiment of the application further includes an information transmission end 8, the information transmission end 8 is mounted on the support 3, the information transmission end 8 is in electrical connection with the image acquisition module 41 and the laser welding module 42 respectively, and the controller 7 is in communication connection with the information transmission end 8. The information transmission end 8 can include the data cable or the wireless communication device for connecting the image acquisition module 41 and the laser welding module 42 with the controller 7 respectively, the information transmission end 8 as a centralized data transmission node can receive and forward the surface feature information of the pole 101 obtained by the image acquisition module 41 to the controller 7, including the surface image 11 and the roughness information, and at the same time, the welding instruction generated by the controller 7 is forwarded to the laser welding module 42, so as to reduce the risk of line interference, improve the stability and efficiency of data transmission.

[0035] In some embodiments, the visual positioning device for laser welding provided by the present application comprises a display 9 mounted on the mounting platform 1, the display 9 is electrically connected with the information transmission end 8, and the display 9 is used to display the surface image 11 of the pole 101. Figure 1 As shown in the figure, the surface image 11 of the pole 101 is displayed on the display 9. The display 9 can receive and visualize the real-time surface image 11 of the pole 101 through the information transmission end 8. The operator can directly observe the positioning state, contour features and surface abnormalities of the pole 101, such as surface contamination or damage, and manually intervene in the fine adjustment of the position adjusting assembly 6 or pause the welding when necessary, which is conducive to the transparency of monitoring, reduces the risk of welding errors caused by identification deviation, improves the adaptability to complex working conditions such as surface defects, and reduces the rework rate.

[0036] In some embodiments, the visual positioning device for laser welding provided by the present application comprises a position adjusting assembly 6, which comprises a sliding rail 61, a position adjusting plate 62, a limiting block 63 and a fixing block 64. The sliding rail 61 is mounted on the bracket 3 and arranged in a direction perpendicular to the mounting platform 1. The position adjusting plate 62 is in sliding connection with the sliding rail 61. The limiting block 63 is mounted on the position adjusting plate 62. The fixing block 64 is in elastic connection with the limiting block 63. The fixing block 64 is in detachable connection with the limiting member 5. The position adjusting plate 62 drives the limiting block 63 and the fixing block 64 to move towards or away from the pole 101 along the sliding rail 61. The vertically arranged sliding rail 61 enables the limiting member 5 to move in the vertical direction, so as to avoid horizontal deviation affecting the alignment accuracy. Meanwhile, the elastic connection between the limiting block 63 and the fixing block 64 can absorb the slight impact when the limiting member 5 contacts the pole 101, preventing hard collision from damaging the pole 101. In addition, the detachable connection facilitates quick replacement of the limiting member 5 adapted to different sizes of the pole 101.

[0037] In some embodiments, the position adjusting assembly 6 of the visual positioning device for laser welding provided by the embodiment of the present application further comprises elastic members 65 connected with the limiting blocks 63 and the fixed blocks 64 respectively. The fixed blocks 64 and the limiting members 5 can be detachably connected through bolts, and the limiting blocks 63 can be integrally formed with the position adjusting plate 62. In addition, the number of the limiting blocks 63 can be two, and the two limiting blocks 63 are located at the upper and lower ends of the fixed blocks 64 respectively to limit the up-and-down movement distance of the fixed blocks 64. The elastic members 65 can comprise springs, for example, the two ends of the spring are fixedly connected with the limiting blocks 63 and the fixed blocks 64 respectively, or a pin is embedded in the spring, one end of the pin penetrates the fixed block, the other end of the pin is fixedly connected with the limiting block 63, and the spring is sleeved outside the pin, and the two ends of the spring are fixedly connected with the limiting block 63 and the fixed block 64 respectively. It should be noted that the elastic members 65 can also provide controllable elastic pre-tightening force between the limiting blocks 63 and the fixed blocks 64. When the limiting members 5 contact the surface of the pole 101, the compression of the elastic members 65 offsets the excess amount of the downward movement of the position adjusting plate 62, avoids mechanical overload, and enables the limiting members 5 to have stable contact force with the surrounding shell of the pole 101 or the direct contact of the limiting members 5 with the pole 101, thereby improving the clarity of image acquisition and positioning consistency and improving the tolerance to the unevenness or size fluctuation of the surface of the pole 101.

[0038] In order to make a detailed description of the visual positioning detection method for laser welding provided by the present application, the above-mentioned embodiment one has made a detailed description of the visual positioning device for laser welding. Based on the same inventive concept, the present application further provides a visual positioning detection method for laser welding, which is described in detail in embodiment two.

[0039] Please refer to Figure 3 as shown, Figure 3 is a flowchart of the visual positioning detection method for laser welding provided by the embodiment of the present application. The embodiment two of the present application provides a visual positioning detection method for laser welding, which comprises the above-mentioned visual positioning device and further comprises the following steps:

[0040] In step S100, the battery to be welded 10 is placed on the positioning assembly 2 for fixation, and the pole 101 of the battery to be welded 10 is directed towards the scanning image laser welding machine 4. The scanning image laser welding machine 4 comprises an image acquisition module 41 and a laser welding module 42.

[0041] Specifically, the battery to be welded 10 can be placed on the positioning assembly 2 for fixation by a mechanical arm or an operator, so that the pole 101 of the battery to be welded 10 is directed towards the scanning image laser welding machine 4, i.e. the pole 101 of the battery to be welded 10 is located above the battery to be welded 10.

[0042] Step S200, drive the limiting part 5 to move towards the direction close to the pole column 101, so that the limiting center hole 51 on the limiting part 5 is sleeved on the outer periphery of the pole column 101;

[0043] In some embodiments, the limiting center hole 51 on the limiting part 5 is sleeved on the outer periphery of the pole column 101, which includes that when the limiting center hole 51 is sleeved on the pole column 101, the limiting part 5 and the pole column 101 adopt flexible contact.

[0044] Specifically, the limiting center hole 51 can guide image acquisition and laser path to force alignment of the center of the pole column 101. At the same time, the flexible contact can absorb the impact caused by the assembly tolerance and surface unevenness of the pole column 101, so as to improve the positioning accuracy while protecting the integrity of the pole column 101.

[0045] Step S300, the image acquisition module 41 acquires the surface feature information of the pole column 101 through the limiting center hole 51, and the surface feature information includes the surface image 11 of the pole column 101 and the surface roughness information of the pole column 101;

[0046] Specifically, through the image acquisition module 41 and the aligned limiting center hole 51, the two-dimensional image and roughness information of the surface of the pole column 101 can be obtained. In addition, the surface roughness information of the pole column 101 can be obtained by a confocal microscope. The surface roughness information can refer to the microscopic geometric feature of the surface of the pole column 101 to be welded. By limiting the field of view through the limiting center hole 51, background interference can be excluded to improve the image signal-to-noise ratio. After synchronously obtaining the topography and roughness data of the surface of the pole column 101, double visual basis can be provided for the following profile recognition and welding parameter correction.

[0047] Step S400, the controller 7 identifies the actual profile of the pole column 101 according to the surface feature information, and generates a welding trajectory;

[0048] In some embodiments, the controller 7 identifies the actual profile of the pole column 101 according to the surface feature information, and generates a welding trajectory, which includes: performing edge detection on the surface image 11 to extract the actual profile of the pole column 101; based on the actual profile and the preset welding parameters, simulating a welding path in a virtual coordinate system; correcting the power distribution of the welding path according to the surface roughness information to generate a final trajectory file. The above-mentioned preset welding parameters can include a pre-set annular path, a spiral path, and a linear trajectory.

[0049] Specifically, based on the actual contour identified above, a welding path can be generated in a virtual coordinate system, which includes actual welding start and end points, welding speed, trajectory shape and laser power. As the center of the limiting hole 51 of the limiting member 5 is taken as the origin, a virtual two-dimensional coordinate system is established, and the actual contour coordinates extracted by edge detection, such as the pixel coordinates of the edge of the pole 101, are mapped into the virtual coordinate system through geometric transformation, so that the contour position and the actual physical position correspond to each other. According to the geometric characteristics of the actual contour, such as the diameter, the center offset, the basic path template is dynamically adjusted. When a high roughness area is detected, the power of this section of path can be increased to compensate for the energy loss caused by light scattering. When a low roughness area is detected, the basic power can be maintained to avoid overburning. According to the surface roughness information, the laser power can be corrected, such as the roughness value and the compensation coefficient of the laser power are set in the controller 7 in advance. The compensation coefficient can be set according to the actual welding requirements. According to the compensation coefficient, the laser power of the welding position corresponding to the roughness value can be adjusted, that is, the path power of the high roughness area is increased by a certain multiple, or the path power of the low roughness area can also be reduced by a certain multiple. Through power compensation, the consistency of the penetration depth is improved to avoid virtual welding or overburning. The final trajectory file formed is beneficial to control the spatial position and energy distribution of the laser, and realizes adaptive welding of complex contours. The final trajectory file generated can include path and power parameters as direct execution instructions of the following step S500.

[0050] Step S500, the laser welding module 42 performs laser welding on the pole 101 based on the welding trajectory.

[0051] Wherein the laser welding module 42 performs laser welding on the pole 101 based on the welding trajectory includes that the laser welding module 42 receives the final trajectory file to perform laser welding on the pole 101 by the laser welding module 42.

[0052] Specifically, after the laser welding module 42 receives the final trajectory file, the deflection angle of the galvanometer mirror can be controlled so that the laser beam performs welding on the pole 101 according to the path and power specified in the final trajectory file.

[0053] The second embodiment of the present application provides a visual positioning detection method for laser welding, which further includes transmitting the surface image 11 to the display 9 through the information transmission end 8 to display the image of the pole 101 of the battery 10 to be welded on the display 9 in real time.

[0054] Specifically, the surface image 11 of the pole 101 acquired by the image acquisition module 41 in the above step S300 can be transmitted to the display 9 through the information transmission end 8 to realize real-time monitoring of the welding process. Visualizing the working condition can allow manual checking of the positioning or welding state to realize timely intervention of abnormalities such as limit deviation, thereby reducing the rate of defective products.

[0055] The present application provides a kind of visual positioning detection method for laser welding, by placing the battery 10 to be welded on the positioning assembly 2 and fixed, and make the pole 101 of the battery 10 to be welded towards scanning image laser welding machine 4, the scanning image laser welding machine 4 includes image acquisition module 41 and laser welding module 42;Again drive limit piece 5 moves to the direction close to the pole 101, to make the limit center hole 51 on the limit piece 5 is set on the outer periphery of the pole 101;Then the image acquisition module 41 passes through the limit center hole 51 and collects the surface feature information of the pole 101, the surface feature information includes the surface image 11 of the pole 101 and the surface roughness information of the pole 101;Again, the actual contour of the pole 101 is identified according to the surface feature information by controller 7, and welding trajectory is generated;After that, the laser welding module 42 carries out laser welding on the pole 101 based on the welding trajectory. By position adjusting assembly 6 drives limit piece 5 to move to the upper of pole 101, so that limit center hole 51 is aligned with the matched pole 101, image acquisition module 41 obtains the surface feature information of the pole 101 through limit center hole 51 and is transmitted to controller 7. The actual contour is identified according to the surface feature information by controller 7 and welding trajectory is generated, and then laser welding module 42 can perform welding according to the welding trajectory. In turn, it can adapt to the welding of pole 101 and bar sheet with different surface morphology, improve the welding precision and welding speed. Thus, the technical effects of improving welding quality, improving efficiency and adaptability are achieved in the process of welding the pole 101 and bar sheet of the battery 10 to be welded.

[0056] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A visual positioning device for laser welding, characterized in that, The visual positioning device comprises a mounting platform, a positioning assembly arranged on the mounting platform, a bracket, a scanning image laser welding machine mounted on the bracket, a limiting piece with a limiting center hole, a position adjusting assembly, and a controller. The positioning assembly is used to carry and position a battery to be welded. The scanning image laser welding machine comprises an image acquisition module and a laser welding module. The position adjusting assembly is in sliding connection with the bracket. The limiting piece is in detachable connection with the position adjusting assembly. The position adjusting assembly drives the limiting piece to move towards or away from the pole of the battery to be welded, so that the limiting center hole is aligned with the pole of the battery to be welded. The controller is in communication connection with the image acquisition module and the laser welding module. The controller is configured to receive surface feature information of the pole acquired by the image acquisition module through the limiting center hole. The surface feature information comprises a surface image of the pole and surface roughness information of the pole. The actual contour of the pole is identified according to the surface image to generate a welding track. The laser welding module controls laser welding of the pole based on the welding track.

2. The visual positioning device for laser welding of claim 1, wherein, The visual positioning device further comprises an information transmission end mounted on the bracket. The information transmission end is in electrical connection with the image acquisition module and the laser welding module. The controller is in communication connection with the information transmission end.

3. The visual positioning device for laser welding of claim 2, wherein, The visual positioning device further comprises a display mounted on the mounting platform. The display is in electrical connection with the information transmission end. The display is used to display the surface image of the pole.

4. The visual positioning device for laser welding of claim 1, wherein, The position adjusting assembly comprises a sliding rail mounted on the bracket, a position adjusting plate in sliding connection with the sliding rail, a limiting block mounted on the position adjusting plate, and a fixed block in elastic connection with the limiting block. The sliding rail is arranged in a direction perpendicular to the mounting platform. The fixed block is in detachable connection with the limiting piece. The position adjusting plate drives the limiting block and the fixed block to move towards or away from the pole along the sliding rail.

5. The visual positioning device for laser welding of claim 4, wherein, The position adjusting assembly further comprises an elastic piece in connection with the limiting block and the fixed block.

6. A method for visualizing positioning detection for laser welding, characterized in that The visual positioning detection method comprises the visual positioning device according to any one of claims 1 to 5. The method further comprises placing a battery to be welded on the positioning assembly for fixation, and making the pole of the battery to be welded face the scanning image laser welding machine. The scanning image laser welding machine comprises an image acquisition module and a laser welding module. driving the limiting piece to move towards the pole, so that the limiting center hole on the limiting piece is sleeved on the outer periphery of the pole. The image acquisition module acquires surface feature information of the pole through the limiting center hole. The surface feature information comprises a surface image of the pole and surface roughness information of the pole. The controller identifies the actual contour of the pole according to the surface feature information, and generates a welding track. The laser welding module performs laser welding on the pole based on the welding track.

7. The method for visualizing the positioning detection for laser welding according to claim 6, characterized in that, The controller identifies an actual contour of the pole based on the surface feature information, and generates a welding track, which includes: performing edge detection on the surface image to extract the actual contour of the pole; simulating a welding path in a virtual coordinate system based on the actual contour and preset welding parameters; and correcting power distribution of the welding path based on the surface roughness information to generate a final track file.

8. The method for visualizing the positioning detection for laser welding according to claim 7, characterized in that, The laser welding module performs laser welding on the pole based on the welding track, which includes: receiving the final track file by the laser welding module to perform laser welding on the pole by the laser welding module.

9. The method for visualizing the positioning detection for laser welding according to claim 6, characterized in that, The limiting center hole on the limiting piece is sleeved on the outer periphery of the pole, which includes: when the limiting center hole is sleeved on the pole, the limiting piece and the pole adopt flexible contact.

10. The method for visualizing the positioning detection for laser welding according to claim 6, characterized in that, The visual positioning detection method further includes: transmitting the surface image to a display through an information transmission port to display the image of the pole of the battery to be welded on the display in real time.

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