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CN-122016834-A - Lithium battery tab welding quality detection equipment and nondestructive detection method

CN122016834ACN 122016834 ACN122016834 ACN 122016834ACN-122016834-A

Abstract

The invention relates to the technical field of lithium battery tab welding quality detection equipment, in particular to lithium battery tab welding quality detection equipment and a nondestructive detection method. Its technical scheme includes the frame, still including installing the conveyor in the frame, install a plurality of mounting panels that are used for installing the lithium cell on the conveyor, the synchronous reciprocal cyclic movement of a plurality of mounting panels of conveyor drive, install first support frame and the second support frame in the frame, fixed mounting has 3D line laser camera on the first support frame, installs 2D camera on the second support frame, installs the subassembly that slides on the second support frame, the synchronous removal of subassembly control 2D camera and mounting panel that slides. The invention solves the fundamental contradiction of 2D detection requirement static and 3D detection requirement uniform motion on a single assembly line, realizes the efficient seamless integration of the two detection technologies, fully exerts the respective advantages of 2D and 3D vision and realizes the omnibearing nondestructive detection of the welding appearance and the internal three-dimensional quality.

Inventors

  • HUANG JIAN
  • WEI DONGHAI
  • GUO DAOCHUAN
  • LI SHUO

Assignees

  • 东莞市金赛尔电池科技有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. The utility model provides a lithium cell tab welding quality check out test set, includes frame (9), its characterized in that still includes: The conveying device (1) is arranged on the frame (9), a plurality of mounting plates (2) for mounting lithium batteries are arranged on the conveying device (1), and the conveying device (1) drives the plurality of mounting plates (2) to synchronously reciprocate and circularly move; Install first support frame (3) and second support frame (4) on frame (9), fixed mounting has 3D line laser camera (5) on first support frame (3), install 2D camera (6) on second support frame (4), install on second support frame (4) and slide subassembly (42), slide subassembly (42) control 2D camera (6) and mounting panel (2) synchronous motion, install push rod subassembly (7) on mounting panel (2), push rod subassembly (7) and drive after sliding subassembly (42) contact slide subassembly (42) with mounting panel (2) synchronous motion.
  2. 2. The lithium battery tab welding quality detection device according to claim 1, wherein the conveying device (1) comprises two first guide seats (11) and second guide seats (12) fixedly installed on two sides of the frame (9), a plurality of first sliding rods (14) are slidably installed on the two first guide seats (11), connecting blocks (13) are fixedly installed on the first sliding rods (14), the connecting blocks (13) are in one-to-one correspondence and fixedly connected with the mounting plates (2), guide blocks (15) are fixedly installed on two sides of the mounting plates (2), and the guide blocks (15) are slidably connected with the second guide seats (12).
  3. 3. The lithium battery tab welding quality detection device according to claim 2, wherein a power assembly (16) is installed on the frame (9), the power assembly (16) drives a plurality of first sliding rods (14) to move along the first guide seat (11), the power assembly (16) comprises a motor (161) fixedly installed on the frame (9) and two groups of belt wheels (162) rotatably installed on the frame (9), a transmission belt (163) is installed on the same group of belt wheels (162), the belt wheels (162) on two sides are fixedly connected through a transmission shaft (164), and an output shaft of the motor (161) is fixedly connected with the transmission shaft (164) in a coaxial mode.
  4. 4. A lithium battery tab welding quality detection device according to claim 3, characterized in that the first support frame (3) comprises a first transverse plate (31) fixedly mounted on the frame (9), a first guide shaft (32) is slidably mounted on the first transverse plate (31), a first connecting plate (33) is fixedly mounted on the first guide shaft (32), a first screw rod (34) is connected to the first transverse plate (31) in a threaded manner, the other end of the first screw rod (34) is rotatably connected with the first connecting plate (33), and the 3D line laser camera (5) is fixedly connected with the first connecting plate (33).
  5. 5. The lithium battery tab welding quality detection device according to claim 4, wherein the second support frame (4) comprises two second transverse plates (41) fixedly mounted on the frame (9), the sliding assembly (42) comprises sliding rails (421) fixedly mounted on the second transverse plates (41), sliding plates (422) are slidably mounted on the two sliding rails (421), first springs (423) are fixedly mounted between two ends of the sliding plates (422) and end faces of the sliding rails (421), and lifting assemblies (43) are mounted on the sliding plates (422).
  6. 6. The lithium battery tab welding quality detection device according to claim 5, wherein the lifting assembly (43) comprises a second guide shaft (431) slidably mounted on a sliding plate (422), and a second connecting plate (432) fixedly mounted on the second guide shaft (431), a second screw rod (433) is connected to the sliding plate (422) in a threaded manner, the other end of the second screw rod (433) is rotatably connected with the second connecting plate (432), and the 2D camera (6) is fixedly connected with the second connecting plate (432).
  7. 7. The lithium battery tab welding quality detection device according to claim 6, wherein the push rod assembly (7) comprises a driving rod (71) rotatably mounted on the mounting plate (2), a second spring (72) is fixedly mounted between one end of the driving rod (71) and the mounting plate (2), and a roller (73) is rotatably mounted on the driving rod (71).
  8. 8. The lithium battery tab welding quality detection device according to claim 7, wherein a reset buffer assembly (8) is installed on the second transverse plate (41), the reset buffer assembly (8) comprises two rotating rods (81) rotatably installed on the second transverse plate (41), a third spring (82) is fixedly installed at one end of each rotating rod (81), a connecting seat (83) is fixedly installed on each sliding plate (422), and a resistance wheel (84) is rotatably installed on each connecting seat (83).
  9. 9. The lithium battery tab welding quality detection device according to claim 8, wherein the mounting plate (2) is provided with a plurality of sliding grooves (21), a positioning block (22) is slidably arranged in the sliding grooves (21), and the positioning block (22) is connected with a butt bolt (23) in a threaded manner.
  10. 10. The nondestructive testing method for the welding quality of the lithium battery tab is characterized by being applied to the equipment for testing the welding quality of the lithium battery tab according to claim 9, and comprises the following steps: Driving all mounting plates (2) to start to circularly move on a conveying device (1) through a power assembly (16), and sequentially clamping lithium batteries to be detected on the mounting plates (2) which move to an upper blanking station by an operator; Step two, the mounting plate (2) for bearing the battery is driven by the conveying device (1) to pass through a 3D detection station below the first support frame (3) at a constant speed, a fixedly mounted 3D line laser camera (5) continuously scans welding spots of battery lugs passing through the welding spots at the constant speed to obtain complete three-dimensional contour point cloud data of the welding spots, and the height, flatness and coplanarity of the welding spots are calculated to identify three-dimensional defects such as cold welding, over-welding and the like; The battery after 3D scanning continues to move to a 2D detection station below the second support frame (4) along with the mounting plate (2), the push rod assembly (7) pushes the whole sliding plate (422) to start sliding on the sliding rail (421), at the moment, the 2D camera (6), the mounting plate (2) below and the battery synchronously move, the 2D camera (6) triggers exposure, and a high-definition two-dimensional image without motion blur of welding spots of the tab is captured for analyzing macroscopic defects such as the number, the position and the size of the welding spots, surface splashing and pollution; After the 2D camera finishes shooting, the mounting plate (2) continues to move forwards, the push rod assembly (7) rotates under the guide of the structure of the sliding assembly (42) to enable the roller (73) to be separated from the sliding plate (422), and then the first spring (423) which is stretched or compressed releases elasticity to drive the sliding plate (422) to move reversely to reset; And fifthly, synchronously receiving data from the 3D camera and the 2D camera by a processing system, performing fusion analysis on three-dimensional shape data and two-dimensional appearance information of welding spots by system software, comprehensively judging according to a preset qualification threshold, finally, giving qualified or unqualified judgment results on the welding quality of the lugs of each battery by the system, and storing and recording the results and the data.

Description

Lithium battery tab welding quality detection equipment and nondestructive detection method Technical Field The invention relates to the technical field of lithium battery tab welding quality detection equipment, in particular to lithium battery tab welding quality detection equipment and a nondestructive detection method. Background In the intelligent manufacturing process of the lithium battery, the welding quality of the electrode lugs and the bus bars is a key link for determining the internal resistance, the power characteristic and the safety performance of the battery. Traditional detection methods such as manual visual inspection or single 2D visual inspection are difficult to comprehensively evaluate the quality of the welding points. Although the 2D vision technology can efficiently detect the surface macroscopic defect of the welding spot, the essence is based on planar imaging, and the three-dimensional information such as the height, the flatness and the like of the welding spot cannot be obtained, so that the 2D vision technology has no capability on internal and three-dimensional defects such as insufficient welding, over welding and the like with extremely high harmfulness. In order to overcome the limitation, a 3D line laser contour scanning technology is introduced, and the three-dimensional morphology of a welding spot can be accurately reconstructed in the uniform movement process of the battery by a laser triangulation principle, so that nondestructive quantitative detection of welding depth and volume is realized. Therefore, the 2D and 3D vision systems are combined to form the current most comprehensive and reliable tab welding quality nondestructive testing scheme. In order to realize the comprehensive detection and improve the overall efficiency on a high-speed production line, a natural solution is to integrate the 2D camera and the 3D camera on the same production line, so that a jig carrying the battery sequentially passes through two detection stations along a linear track. However, the integration scheme faces an engineering technical contradiction caused by the fundamental difference of the working principles of the two, namely, 2D visual detection requires that a camera and a battery to be detected are kept absolute static at the moment of exposure so as to capture clear images without motion blur, and 3D line laser detection requires that the battery continuously and uniformly moves relative to the laser camera in the scanning process so as to finish the splicing of three-dimensional contour data. This contradiction is particularly pronounced in arrangements where one horizontal movement mechanism is used to simultaneously carry and drive multiple battery jigs. Because under this architecture, all the jigs move synchronously as a rigid whole, the system cannot keep the battery just under the 3D camera moving at a constant speed while letting the battery on one jig stop to satisfy 2D photographing. If the whole line is paused for 2D photographing, continuous motion conditions required by 3D scanning are interrupted, so that point cloud data are distorted or acquisition is interrupted, and if the whole line is kept continuously running at a constant speed for 3D scanning, 2D images are blurred due to motion, and detection accuracy is seriously affected. When 2D and 3D visual inspection technologies are integrated on a single pipeline with high efficiency and high precision, the technical bottlenecks of the cores are required to be directly faced and solved. Disclosure of Invention The invention aims to solve the problems in the background technology and provides a lithium battery tab welding quality detection device and a nondestructive detection method for integrating 2D and 3D visual detection technologies on a single assembly line with high efficiency and high precision. In one aspect, the invention provides a lithium battery tab welding quality detection device, which comprises a frame and further comprises: The conveying device is arranged on the rack, a plurality of mounting plates for mounting lithium batteries are arranged on the conveying device, and the conveying device drives the plurality of mounting plates to synchronously reciprocate and circularly; Install first support frame and second support frame in the frame, fixed mounting has 3D line laser camera on the first support frame, install 2D camera on the second support frame, install the subassembly that slides on the second support frame, the subassembly that slides control 2D camera and mounting panel synchronous movement, install the push rod subassembly on the mounting panel, the push rod subassembly with the subassembly that slides after the contact drive slide the subassembly with the mounting panel synchronous movement. Optionally, the conveyor includes two first guide holders and second guide holders of fixed mounting in the frame both sides, two slidable mounting has many first slide bars on the first