Battery detection device

Abstract

The utility model provides a battery detection device, which is arranged above a transmission belt, is used for detecting a welding area between a top cover and a shell of a battery on the transmission belt, and comprises a distance adjusting mechanism, a first detection mechanism and a second detection mechanism, the first detection mechanism and the second detection mechanism are symmetrically arranged at the two ends of the lower portion of the distance adjusting mechanism, the distance adjusting mechanism is used for adjusting the distance between the first detection mechanism and the second detection mechanism, and the first detection mechanism and the second detection mechanism are used for detecting a welding area between a top cover and a shell of a battery; each of the first detection mechanism and the second detection mechanism comprises a mounting seat, a two-dimensional camera is arranged on each mounting seat in a manner that the sight line faces downwards, and each two-dimensional camera is used for collecting a two-dimensional image of the to-be-detected battery. According to the battery detection device provided by the utility model, the two-dimensional image and the three-dimensional image of the welding area of the top cover of the battery and the shell of the battery can be acquired by the detection device, so that the welding appearance defect of the battery can be detected.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and specifically to a battery testing device. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage systems, the production quality and safety of power batteries have received widespread attention. Battery welding, as a key process in battery manufacturing, directly affects the structural integrity, reliability, safety, and performance of the battery. However, in existing technologies, various welding defects can still occur after battery welding, such as poor welding, incomplete weld circles, incomplete welds, weld misalignment, weld trajectories extending beyond the edge of the terminal post, excessively large pits, and incomplete welds. These problems not only affect the battery's electrical performance but may also lead to safety hazards such as leakage, short circuits, and even fires.

[0003] Traditional welding defect detection processes primarily rely on manual visual inspection, a method with significant limitations. First, manual inspection is inefficient and unsuitable for large-scale production. Second, the results are highly dependent on the operator's experience and subjective judgment; significant differences in skill levels among personnel lead to inconsistent inspection outcomes. Furthermore, manual inspection struggles to detect minute welding defects, easily resulting in missed defects and impacting the overall battery quality. Utility Model Content

[0004] This utility model provides a battery testing device to solve the problems of slow speed and difficulty in detecting minute welding defects in manual battery testing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a battery testing device, disposed above a conveyor belt, for detecting the welding area between the top cover and the casing of a battery on the conveyor belt. The battery testing device includes a spacing adjustment mechanism, a first testing mechanism, and a second testing mechanism. The first testing mechanism and the second testing mechanism are symmetrically arranged at the lower ends of the spacing adjustment mechanism. The spacing adjustment mechanism is used to adjust the distance between the first testing mechanism and the second testing mechanism. The first testing mechanism and the second testing mechanism are used to detect the welding area between the top cover and the casing of the battery.

[0006] Both the first and second testing units include a mounting base. A two-dimensional camera is mounted on the mounting base with its line of sight facing downwards. The two-dimensional camera is used to acquire two-dimensional images of the battery under test. A reflector is also mounted on the mounting base below the two-dimensional camera. The reflector is used to change the optical path of the two-dimensional camera so that the two-dimensional camera can acquire two-dimensional images of the weld joint on the side of the battery, which is parallel to the direction of movement of the battery under test. A three-dimensional camera is mounted on the mounting base. The three-dimensional camera is used to acquire three-dimensional images of the weld joint between the surface of the battery under test captured by the two-dimensional camera and the top cover surface of the battery under test. A light source is also mounted on the mounting base to illuminate the battery under test.

[0007] Furthermore, the 3D camera is mounted on the mounting base via a dual-angle adjustment component. The dual-angle adjustment component can adjust the tilt angle between the ray of the 3D camera and the plane parallel to the direction of movement of the battery under test, and can also adjust the tilt angle between the ray of the 3D camera and the horizontal plane.

[0008] Furthermore, the dual-angle adjustment assembly includes a first hinge seat, a first rotating frame, a second hinge seat, and a second rotating frame. The first hinge seat is disposed on the mounting base, and the first rotating frame is hinged to the first hinge seat and can rotate in a vertical plane. A first adjusting block is disposed on the first rotating frame. A first screw fixing seat is disposed on both sides of the first adjusting block on the first hinge seat. A first adjusting screw is disposed on the first screw fixing seat, and one end of the first adjusting screw abuts against the first adjusting block.

[0009] The second hinge seat is located at the bottom of the first rotating frame. The second rotating frame is hinged to the second hinge seat and can rotate in a plane perpendicular to the rotation plane of the first rotating frame. The second rotating frame is provided with a second adjusting block. The second hinge seat is provided with two second screw fixing seats located on both sides of the second adjusting block. The second screw fixing seats are provided with second adjusting screws, and one end of the second adjusting screw abuts against the second adjusting block.

[0010] Furthermore, the spacing adjustment mechanism includes a mounting plate, a bidirectional lead screw with opposite threads, and a drive unit. The two ends of the bidirectional lead screw have opposite thread directions and are rotatably connected to the bottom of the mounting plate. Each of the two mounting seats is provided with a nut that is threadedly connected to the bidirectional lead screw, and the two mounting seats are respectively set at both ends of the bidirectional lead screw through the nuts. The output end of the drive unit is connected to the bidirectional lead screw and the drive unit is used to drive the bidirectional lead screw to rotate. The spacing adjustment mechanism also includes a limiting component that restricts the rotation of the mounting seats.

[0011] Furthermore, the limiting component includes a limiting guide rail disposed on the mounting plate and a limiting seat disposed on the mounting base, wherein the limiting guide rail is parallel to the bidirectional lead screw with positive and negative threads, and the limiting seat is sleeved on the limiting guide rail.

[0012] The beneficial effects of this utility model are as follows:

[0013] The battery testing device provided by this utility model, through the setting of a spacing adjustment mechanism, a first testing mechanism and a second testing mechanism, enables the testing device to acquire two-dimensional and three-dimensional images of the welding area of ​​the top cover and the casing of the battery, thereby detecting welding appearance defects of the battery. Attached Figure Description

[0014] Figure 1 A three-dimensional view of the battery testing device;

[0015] Figure 2 This is a 3D view of the spacing adjustment mechanism;

[0016] Figure 3 A three-dimensional view of the first testing institution;

[0017] Figure 4 A 3D view of the dual-angle adjustment component;

[0018] Figure 5 This is a 3D view of the other angle of the dual-angle adjustment component.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Spacing adjustment mechanism; 11. Mounting plate; 12. Bidirectional lead screw with positive and negative threads; 13. Drive unit; 14. Limiting assembly; 141. Limiting guide rail; 142. Limiting seat; 2. First detection mechanism; 21. Mounting seat; 22. Two-dimensional camera; 23. Three-dimensional camera; 24. Light source; 25. Reflector; 26. Dual angle adjustment assembly; 261. First hinge seat; 2611. First screw fixing seat; 2612. First adjusting screw; 262. First rotating frame; 2621. First adjusting block; 263. Second hinge seat; 2631. Second screw fixing seat; 2632. Second adjusting screw; 264. Second rotating frame; 2641. Second adjusting block; 3. Second detection mechanism. Detailed Implementation

[0021] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0022] like Figure 1-5As shown, this utility model embodiment provides a battery testing device, which is set above a conveyor belt and is used to detect the welding area between the top cover and the shell of the battery on the conveyor belt. The battery testing device includes a spacing adjustment mechanism 1, a first detection mechanism 2, and a second detection mechanism 3. The first detection mechanism 2 and the second detection mechanism 3 are symmetrically arranged at both ends below the spacing adjustment mechanism 1. The spacing adjustment mechanism 1 is used to adjust the distance between the first detection mechanism 2 and the second detection mechanism 3. The first detection mechanism 2 and the second detection mechanism 3 are used to detect the welding area between the top cover and the shell of the battery.

[0023] Both the first testing mechanism 2 and the second testing mechanism 3 include a mounting base 21. A two-dimensional camera 22 is mounted on the mounting base 21 with its line of sight facing downwards. (In a specific embodiment, the two-dimensional camera 22 has 5 megapixels, a field of view of 36*30mm, a camera resolution of 2448*2048 pixels, a frame rate of 24.2fps, and a single pixel accuracy of 0.02mm / pixel.) 1. Detection accuracy 0.1mm), 2D camera 22 is used to acquire 2D images of the battery under test. A reflector 25 located below the 2D camera 22 is also provided on the mounting base 21. The reflector 25 is used to change the optical path of the 2D camera 22 so that the 2D camera 22 can acquire 2D images of the welding joint on the side of the battery parallel to the moving direction of the battery under test. A 3D camera 23 is provided on the mounting base 21. The 3D camera 23 is used to acquire 3D images of the welding joint between the surface of the battery under test captured by the 2D camera 22 and the top cover surface of the battery under test (in a specific embodiment, the model of the 3D camera 23 is LJ-X8200 or LJ-X8080). A light source 24 for illuminating the battery under test is also provided on the mounting base 21.

[0024] In order to make the shooting angle of the 3D camera 23 wider and to make the 3D camera 23 better aligned with the location to be collected, in a preferred embodiment of the present invention, the 3D camera 23 is mounted on the mounting base 21 by means of a dual-angle adjustment component 26. The dual-angle adjustment component 26 can adjust the tilt angle between the ray of the 3D camera 23 and the plane parallel to the direction of movement of the battery under test, and can also adjust the tilt angle between the ray of the 3D camera 23 and the horizontal plane.

[0025] like Figure 4-5As shown, the dual-angle adjustment assembly 26 includes a first hinge seat 261, a first rotating frame 262, a second hinge seat 263, and a second rotating frame 264. The first hinge seat 261 is disposed on the mounting base 21. The first rotating frame 262 is hinged to the first hinge seat 261 and can rotate in a vertical plane. A first adjusting block 2621 is disposed on the first rotating frame 262. A first screw fixing seat 2611 is disposed on both sides of the first adjusting block 2621 on the first hinge seat 261. A first adjusting screw 2612 is disposed on the first screw fixing seat 2611, and one end of the first adjusting screw 2612 abuts against the first adjusting block 2621.

[0026] The second hinge seat 263 is disposed at the bottom of the first rotating frame 262. The second rotating frame 264 is hinged to the second hinge seat 263 and can rotate in a plane perpendicular to the rotation plane of the first rotating frame 262. The second rotating frame 264 is provided with a second adjusting block 2641. The second hinge seat 263 is provided with two second screw fixing seats 2631 located on both sides of the second adjusting block 2641. The second screw fixing seats 2631 are provided with second adjusting screws 2632, and one end of the second adjusting screws 2632 abuts against the second adjusting block 2641.

[0027] When it is necessary to adjust the angle of the 3D camera 23: by rotating the first adjusting screw 2612, the relative positions of the first hinge seat 261 and the first rotating frame 262 are changed, and by rotating the second adjusting screw 2632, the relative positions of the second hinge seat 263 and the second rotating frame 264 are changed, thereby changing the position of the 3D camera 23, that is, adjusting the tilt angle of the ray of the 3D camera 23 with the plane parallel to the direction of movement of the battery under test, and adjusting the tilt angle of the ray of the 3D camera 23 with the horizontal plane, so as to change the angle of the output end of the 3D camera 23.

[0028] To provide the operator with an intuitive reference and make rotation operation more convenient, in a preferred embodiment of this utility model, a dial is provided on the first rotating frame 262, and a pointer is provided on the first hinge seat 261 to cooperate with the dial on the first rotating frame 262, so that the operator can quickly determine the first adjusting screw 2612 by observing the dial, thereby adjusting the relative position of the first hinge seat 261 and the first rotating frame 262; a dial is provided on the second rotating frame 264, and a pointer is provided on the second hinge seat 263 to cooperate with the dial on the second rotating frame 264, so that the operator can quickly determine the current position of the second adjusting screw 2632 by observing the dial, thereby adjusting the relative position of the second hinge seat 263 and the second rotating frame 264.

[0029] This utility model is used to inspect the welding areas of the top cover and casing of a battery. The welding appearance defects that can be detected include: welding pits (pit depth ≥ 0.2mm, pit diameter ≥ 0.2mm, number of pits), welding bursts (burst depth ≥ 0.2mm, burst diameter ≥ 0.2mm, number of bursts), welding pinholes (pinhole depth ≥ 0.2mm, pinhole diameter ≥ 0.2mm, number of pinholes, pinhole location), wavy edges (wavy edge height ≥ 0.2mm), protrusions (protrusion height ≥ 0.2mm, protrusion diameter ≥ 0.2mm), weld line offset (weld protrusion above casing surface ≥ 0.2mm), weld line length (weld break distance > 0.2mm), and weld line width (height > 0.2mm).

[0030] Specifically, in the battery testing equipment of this utility model, the detection of welding defects is determined by combining the two-dimensional images acquired by the two-dimensional camera 22 and the three-dimensional images acquired by the three-dimensional camera 23.

[0031] Specifically, the distance between the first detection mechanism 2 and the second detection mechanism 3 is adjusted by the spacing adjustment mechanism 1, and the position of the 3D camera 23 is adjusted by the dual-angle adjustment component 26 so that the 3D camera 23 is aligned with the test position of the battery. The light source 24 is activated, and the 2D camera 22 and the 3D camera 23 are also activated. The 2D camera 22 acquires a 2D image of the weld joint on the side of the battery parallel to the direction of movement of the battery under test through the reflector 25. The 3D camera 23 acquires a 3D image of the weld joint between the surface of the battery under test captured by the 2D camera 22 and the top cover surface of the battery under test. By combining the 2D and 3D images, a comprehensive and systematic detection of battery welding defects is achieved. By changing the relative position of the battery and the battery detection device, the detection of welding defects at both ends of the battery can be completed. Through the above settings, not only can the efficiency of battery welding defect detection be improved, but the 2D-to-3D image detection method can also more comprehensively detect welding defects, thereby improving product quality.

[0032] For solder wire offset, solder wire length, and solder wire width, a two-dimensional image captured by a two-dimensional camera can be used for one judgment, and a three-dimensional image captured by a three-dimensional camera can be used for another judgment. If both judgments are qualified, a qualified result is output. For defects in depth and height, such as bumps and pits, suspected defects can be marked on the two-dimensional image, and the three-dimensional image can be further judged.

[0033] The spacing adjustment mechanism 1 includes a mounting plate 11, a bidirectional lead screw 12 with opposite threads, and a drive unit 13. The threads at both ends of the bidirectional lead screw 12 are in opposite directions, and the bidirectional lead screw 12 is rotatably connected to the bottom of the mounting plate 11. Each of the two mounting seats 21 is provided with a nut that is threadedly connected to the bidirectional lead screw 12, and the two mounting seats 21 are respectively set at both ends of the bidirectional lead screw 12 through the nuts, so that when the bidirectional lead screw 12 rotates, it drives the two mounting seats 21 to move relative to each other. The output end of the drive unit 13 is connected to the bidirectional lead screw 12 with forward and reverse teeth. The drive unit 13 is used to drive the bidirectional lead screw 12 with forward and reverse teeth to rotate. The pitch adjustment mechanism 1 also includes a limiting component 14 that limits the rotation of the mounting base 21 (in a specific embodiment, the limiting component 14 includes a limiting guide rail 141 disposed on the mounting plate 11 and a limiting seat 142 disposed on the mounting base 21, and the limiting guide rail 141 is parallel to the bidirectional lead screw 12 with forward and reverse teeth, and the limiting seat 142 is sleeved on the limiting guide rail 141).

[0034] Specifically, the drive unit 13 includes a servo motor and a belt drive mechanism. The servo motor is mounted on the mounting plate 11, and the output end of the servo motor is connected to the bidirectional lead screw 12 via the belt drive mechanism. When it is necessary to adjust the distance between the first detection mechanism 2 and the second detection mechanism 3, the drive unit 13 drives the bidirectional lead screw 12 to rotate. Through the cooperation between the bidirectional lead screw 12 and the nut, the first detection mechanism 2 and the second detection mechanism 3 are driven to move relative to each other on the bidirectional lead screw 12, so as to move closer to each other or further away from each other, thereby adjusting the distance between the first detection mechanism 2 and the second detection mechanism 3. The limiting component 14 prevents the first detection mechanism 2 and the second detection mechanism 3 from rotating on the bidirectional lead screw 12.

[0035] In summary, this battery testing device, through the spacing adjustment mechanism 1, the first testing mechanism 2, and the second testing mechanism 3, enables the testing device to acquire two-dimensional and three-dimensional images of the welding area of ​​the battery top cover and the battery casing, thereby detecting welding appearance defects of the battery.

[0036] The embodiments described above merely illustrate the implementation of this utility model, and should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery inspection apparatus disposed above a conveyance belt for inspecting a welding area between a top cover and a case of a battery on the conveyance belt, characterized by, The battery testing device includes a spacing adjustment mechanism (1), a first testing mechanism (2), and a second testing mechanism (3). The first testing mechanism (2) and the second testing mechanism (3) are symmetrically arranged at both ends below the spacing adjustment mechanism (1). The spacing adjustment mechanism (1) is used to adjust the distance between the first testing mechanism (2) and the second testing mechanism (3). The first testing mechanism (2) and the second testing mechanism (3) are used to test the welding area between the top cover and the casing of the battery. Both the first testing unit (2) and the second testing unit (3) include a mounting base (21). A two-dimensional camera (22) is mounted on the mounting base (21) with its line of sight facing downwards. The two-dimensional camera (22) is used to acquire two-dimensional images of the battery under test. A reflector (25) is also mounted on the mounting base (21) below the two-dimensional camera (22). The reflector (25) is used to change the optical path of the two-dimensional camera (22) so that the two-dimensional camera (22) can acquire two-dimensional images of the side weld joint of the battery parallel to the direction of movement of the battery under test. A three-dimensional camera (23) is mounted on the mounting base (21). The three-dimensional camera (23) is used to acquire three-dimensional images of the weld joint between the surface of the battery under test captured by the two-dimensional camera (22) and the top cover surface of the battery under test. A light source (24) is also mounted on the mounting base (21) for illuminating the battery under test.

2. The battery detection apparatus according to claim 1, characterized by The three-dimensional camera (23) is mounted on the mounting base (21) via a dual-angle adjustment component (26). The dual-angle adjustment component (26) can adjust the tilt angle between the ray of the three-dimensional camera (23) and the plane parallel to the direction of movement of the battery under test, and can also adjust the tilt angle between the ray of the three-dimensional camera (23) and the horizontal plane.

3. The battery detection apparatus according to claim 2, characterized by The dual-angle adjustment assembly (26) includes a first hinge seat (261), a first rotating frame (262), a second hinge seat (263), and a second rotating frame (264). The first hinge seat (261) is mounted on the mounting base (21). The first rotating frame (262) is hinged to the first hinge seat (261) and can rotate in a vertical plane. A first adjusting block (2621) is provided on the first rotating frame (262). A first screw fixing seat (2611) is provided on both sides of the first adjusting block (2621) on the first hinge seat (261). A first adjusting screw (2612) is provided on the first screw fixing seat (2611), and one end of the first adjusting screw (2612) abuts against the first adjusting block (2621). The second hinge seat (263) is located at the bottom of the first rotating frame (262). The second rotating frame (264) is hinged to the second hinge seat (263) and can rotate in a plane perpendicular to the rotation plane of the first rotating frame (262). The second rotating frame (264) is provided with a second adjusting block (2641). The second hinge seat (263) is provided with two second screw fixing seats (2631) located on both sides of the second adjusting block (2641). The second screw fixing seat (2631) is provided with a second adjusting screw (2632), and one end of the second adjusting screw (2632) abuts against the second adjusting block (2641).

4. The battery detection apparatus according to claim 1, characterized by The pitch adjustment mechanism (1) includes a mounting plate (11), a bidirectional screw (12) with opposite threads, and a drive unit (13). The threads at both ends of the bidirectional screw (12) are opposite in direction, and the bidirectional screw (12) is rotatably connected to the bottom of the mounting plate (11). Both mounting seats (21) are provided with nuts that are threadedly connected to the bidirectional screw (12), and the two mounting seats (21) are respectively set at both ends of the bidirectional screw (12) through nuts. The output end of the drive unit (13) is connected to the bidirectional screw (12), and the drive unit (13) is used to drive the bidirectional screw (12) to rotate. The pitch adjustment mechanism (1) also includes a limiting component (14) that limits the rotation of the mounting seat (21).

5. The battery detection apparatus according to claim 4, wherein The limiting assembly (14) includes a limiting guide rail (141) disposed on the mounting plate (11) and a limiting seat (142) disposed on the mounting base (21), wherein the limiting guide rail (141) is parallel to the bidirectional lead screw (12) with positive and negative threads, and the limiting seat (142) is sleeved on the limiting guide rail (141).

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