A high-brightness stroboscopic light source for lithium battery pole piece burr detection

Abstract

The utility model discloses a kind of high-brightness stroboscopic light source for lithium battery pole piece burr detection, comprising: fixed seat, assembly site is formed on the fixed seat;Two point light source combinations, the two point light source combinations are obliquely arranged on the fixed seat, so that the outgoing light of two point light source combinations intersects, each point light source combination includes: stroboscopic drive controller, point light source main seat is set on the assembly site, and heat dissipation component is set to the rear end of point light source main seat, point light source circuit board connected with stroboscopic drive controller is provided on point light source main seat, LED lamp pearl is equipped on the point light source circuit board, the front end of point light source main seat is connected with lens component, and the LED lamp pearl is directly opposite the lens component.The utility model solves the contradiction between short exposure time and required light energy under high-speed detection background, image is clear without trailing, significantly improves the signal-to-noise ratio of burr feature, substantially reduces the rate of missed detection and false detection.

Description

Technical Field

[0001] This utility model relates to the field of detection light source technology, and in particular to a high-brightness flash source for detecting burrs on lithium battery electrode sheets. Background Technology

[0002] During lithium battery manufacturing, the positive and negative electrode sheets (hereinafter referred to as "electrodes") are prone to developing micron-sized metal burrs (tiny metal protrusions or residues) at the cutting edges during slitting or die-cutting due to factors such as tool wear, improper clearance, or material characteristics. These burrs can puncture the battery separator, causing internal short circuits and posing serious safety hazards. They also affect the battery's consistency and performance. Therefore, electrode burr detection is a crucial quality control step in lithium battery production.

[0003] Currently, this inspection commonly employs automated optical inspection (AOI) systems based on machine vision. However, existing inspection methods suffer from the following significant drawbacks:

[0004] Insufficient brightness: Electrode production lines operate at extremely high speeds, reaching 80 m / min or even higher. To "freeze" images during high-speed motion, industrial cameras must have very short exposure times (typically in the microsecond range). Ordinary, normally bright visual light sources (such as LED constant-brightness surface lights) provide insufficient light energy to the camera within such short exposure times, resulting in low signal-to-noise ratios, overall darkness, and difficulty in clearly rendering minute burr features.

[0005] Heat dissipation and lifespan issues: Simply increasing the driving current of a constantly lit light source to increase brightness will cause the LED chip to generate enormous heat, accelerate light decay, significantly shorten the lifespan of the light source, and even cause permanent damage. Conventional heat dissipation designs are insufficient to cope with this high heat load.

[0006] Background interference and low contrast: The surface of the electrode has specific texture and reflective properties. Under ordinary light source illumination, the contrast between the burrs and the background of the electrode is not high, which increases the difficulty of image algorithm recognition and easily leads to missed detection and false detection.

[0007] Therefore, there is an urgent need for a special light source that is high in brightness, highly reliable, and capable of producing high-contrast images, specifically designed for this scenario. Utility Model Content

[0008] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a high-brightness flash source for detecting burrs on lithium battery electrode sheets. This invention solves the contradiction between short exposure time and required light energy in the context of high-speed detection. The image is clear and free of ghosting, significantly improving the signal-to-noise ratio of burr features, making minute defects obvious at a glance, and greatly reducing the false detection rate and missed detection rate.

[0009] To achieve the above objectives, this utility model provides a high-brightness flash source for detecting burrs on lithium battery electrode sheets, comprising:

[0010] A mounting base, on which an assembly position is formed;

[0011] Two point light sources are combined and tilted on the mounting base so that the emitted light rays from the two point light sources intersect. Each point light source combination includes: a strobe drive controller, a main point light source base mounted on the mounting position, and a heat dissipation assembly located at the rear end of the main point light source base. A point light source circuit board connected to the strobe drive controller is mounted on the main point light source base. LED beads are mounted on the circuit board. A lens assembly is connected to the front end of the main point light source base, and the LED beads face the lens assembly.

[0012] Furthermore, the lens assembly includes a lens main seat, a first lens, and a second lens. The lens main seat is a hollow tubular structure with a first mounting cavity formed at the front end of the point light source main seat. The rear end of the lens main seat is inserted into and fixed within the first mounting cavity. A first locking portion and a second locking portion are formed on the inner wall of the lens main seat, respectively, and the first lens and the second lens are respectively locked onto the first locking portion and the second locking portion. This locking method enables rapid lens installation, and the axis of the lens assembly coincides with the axis of the point light source main seat, ensuring consistent light propagation direction and reducing optical path distortion.

[0013] Furthermore, it also includes a first sealing element and a second sealing element. The first sealing element is disposed at the abutment between the first lens and the first engaging portion, and the second sealing element is disposed at the abutment between the second lens and the second engaging portion. This enhances the sealing performance of the lens assembly, preventing dust and moisture from the external environment from entering the light source, thereby improving the stability and lifespan of the light source. It also achieves both the fixation of the two lens sets and dust and water resistance.

[0014] Furthermore, both the first and second sealing elements are O-rings made of silicone material. O-rings made of silicone material have good elasticity and high-temperature resistance, enabling them to maintain a stable sealing effect under different working environments.

[0015] Furthermore, it also includes a cover plate, which has a second mounting cavity and a third snap-fit ​​portion. The front end of the lens main seat is inserted into the second mounting cavity, so that the front end of the first lens abuts against the third snap-fit ​​portion. By providing the third snap-fit ​​portion of the cover plate, it can cooperate with the first snap-fit ​​portion to further limit and fix the first lens, thereby improving the overall structural stability and sealing of the lens assembly.

[0016] Furthermore, the first lens is a biconvex lens, and the second lens is a hemispherical lens. The combination of the two lens sets can effectively adjust the focusing and diffusion angles of the light beam, allowing the light to be more evenly distributed over the target area, thereby improving detection accuracy and the applicability of the light source.

[0017] Furthermore, the angle between the extended axes of the two point light sources is θ, where θ ≤ °. By controlling the installation angle of the point light source combination, the light from the two point light sources can be focused on the workstation for specific area detection, further improving the targeting and brightness concentration of the illumination, and ensuring stable imaging and accurate identification even in high-speed movement or complex environments.

[0018] Furthermore, the heat dissipation assembly includes a heat dissipation base, a U-shaped fixing member, and a cooling fan. The heat dissipation base is detachably connected to the main base of the point light source, and the point light source circuit board is detachably connected to the heat dissipation base. The U-shaped fixing member is connected to the heat dissipation base, forming a third mounting space between the U-shaped fixing member and the heat dissipation base. The cooling fan is disposed within this third mounting space and is fixed relative to the U-shaped fixing member. By conducting heat through the heat dissipation base to the point light source circuit board, combined with the forced air cooling effect of the cooling fan, efficient heat dissipation of the point light source assembly is achieved, effectively reducing the operating temperature of the LED chip, extending the lifespan of the light source, and ensuring the stability of the light source output brightness.

[0019] Furthermore, the U-shaped fastener includes two connecting arms and a fixing part connected to the two connecting arms. The two connecting arms are respectively fixedly connected to the upper and lower ends of the heat dissipation base, and the cooling fan is fixedly attached to the inner wall of the fixing part. The U-shaped fastener secures the cooling fan, allowing it to be directly aligned with the heat dissipation surface of the point light source circuit board, thereby directly cooling the heat-generating components during operation and further improving heat dissipation efficiency.

[0020] Furthermore, a first through hole is provided on the fixing part, the inner side of the first through hole is opposite to the cooling fan, and a metal mesh is provided on the outer side of the first through hole. The metal mesh can effectively prevent external dust from entering the third installation space, while not affecting the air intake efficiency of the cooling fan, ensuring the long-term stable operation of the cooling system.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This invention employs a high-current pulse drive method to drive a high-efficiency LED chip. The light source operates in strobe mode, emitting an extremely strong pulse of light only for a brief moment (microseconds) during camera exposure. In contrast, ordinary industrial constant-brightness light sources, to ensure lifespan, typically have their operating current designed below the rated value, resulting in fixed brightness. For example, a common 80W industrial constant-brightness strip light source has a center illuminance of approximately 20,000 Lux (at a working distance of 100mm). This invention, through pulse drive, can increase the instantaneous drive current to several times the LED's rated value, thereby increasing the instantaneous brightness (illuminance) by more than 120 times, reaching over 2,400,000 Lux (under the same measurement conditions). This enormous leap in brightness is impossible for constant-brightness light sources, ensuring that the camera receives sufficient light energy within an extremely short exposure time, resulting in a bright and clear image.

[0023] This invention features highly efficient heat dissipation. Specifically, the point light source circuit board uses a nano-thermal conductive ceramic substrate, combined with an aluminum heat sink and a turbine fan for dual heat dissipation. The built-in high-efficiency strobe drive controller generates far less heat than a constant-on drive of the same power. The aluminum heat sink has multiple fins to increase the heat dissipation area, and a dual ball bearing fan is integrated for forced air cooling, forming a highly efficient active heat dissipation system.

[0024] This invention employs a custom-designed aspherical focusing lens group to replace ordinary diffusers or standard lenses. This lens group precisely focuses the light emitted by the LED onto a narrow focal plane (coinciding with the edge of the electrode). The focusing design of this invention concentrates over 90% of the light energy onto the edge area of ​​the electrode to be detected, which not only further improves the illumination of the effective working area, but more importantly, produces a strong "bright field" or "dark field" effect (depending on the installation angle): metal burrs will form strong high-gloss reflections, creating extremely high contrast with the background, greatly reducing the complexity of image processing algorithms and improving detection accuracy. Attached Figure Description

[0025] To more clearly illustrate the technology in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a high-brightness flash source for detecting burrs on lithium battery electrode sheets according to this utility model;

[0027] Figure 2 yes Figure 1 A frontal view diagram;

[0028] Figure 3 This is a structural schematic diagram of the fixing base of this utility model;

[0029] Figure 4 yes Figure 1 A schematic diagram of the decomposition process;

[0030] Figure 5 This is a schematic diagram of the structure of the point light source main seat of this utility model;

[0031] Figure 6 This is a structural schematic diagram of the lens main seat of this utility model from two different perspectives;

[0032] Figure 7 This is a schematic diagram of the structure of the cover plate of this utility model;

[0033] Figure 8 This is a structural schematic diagram of the U-shaped fastener of this utility model;

[0034] Figure 9 The above is a schematic diagram of the optical path of this utility model.

[0035] The diagram includes:

[0036] 1. Fixing base; 11. Assembly position; 12. First mounting hole; 2. Point light source assembly; 21. Axis extension line; 22. Main base of point light source; 221. First mounting cavity; 222. Third mounting hole; 23. Heat dissipation assembly; 231. Heat dissipation base; 2311. Heat dissipation fins; 232. U-shaped fastener; 2321. Connecting arm; 2322. Fixing part; 2323. First through hole; 2324. Metal mesh; 233. Heat dissipation fan 234. Third mounting space; 24. Point light source circuit board; 241. LED lamp bead; 25. Lens assembly; 251. Lens main seat; 2511. Second mounting hole; 2512. First snap-fit ​​part; 2513. Second snap-fit ​​part; 252. First lens; 253. Second lens; 254. First seal; 255. Second seal; 256. Cover plate; 2561. Second mounting cavity; 2562. Third snap-fit ​​part. Detailed Implementation

[0037] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0038] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0039] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0040] like Figures 1 to 9 This invention discloses a high-brightness flash source for detecting burrs on lithium battery electrode sheets, comprising a mounting base 1 and a combination of two point light sources 2.

[0041] like Figures 1 to 3 As shown, an assembly position 11 is formed on the fixed base 1. The assembly position 11 consists of a plurality of first mounting holes 12 and the space between the first mounting holes 12. In this embodiment, the two point light source assemblies 2 are connected to the first mounting holes 12 by screws, thereby enabling the two point light source assemblies 2 to be fixed to the fixed base 1 at an angle relative to each other, so that the emitted light rays of the two point light source assemblies 2 intersect. The included angle between the extended axes 21 of the two point light source assemblies 2 is θ, where θ ≤ 90°, that is, the value of θ can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, etc. The angle θ can be set by controlling the installation angle of the point light source combination 2, such as 55°, 60°, 65°, 70°, 75°, 80°, 85° and 90°. For example, by setting the first mounting hole 12 at different angles, the point light source combination 2 can be installed with the required angle of the first mounting hole 12. The tilted installation of the two point light source combinations 2 allows the light from the two point light source combinations 2 to be focused on the workstation for detection of specific areas, further improving the targeting and brightness concentration of the lighting, and ensuring stable imaging and accurate recognition even in high-speed movement or complex environments.

[0042] like Figure 4As shown, each point light source assembly 2 includes: a strobe drive controller (not shown in the figure), a point light source main base 22 disposed on the assembly position 11, and a heat dissipation component 23 disposed at the rear end of the point light source main base 22. A point light source circuit board 24 connected to the strobe drive controller is disposed on the point light source main base 22. The point light source circuit board 24 is a nano-thermal conductive ceramic substrate. LED beads 241 are disposed on the point light source circuit board 24. A lens assembly 25 is connected to the front end of the point light source main base 22, and the LED beads 241 face the lens assembly 25. The strobe drive controller is an independently set driver, and different strobe drive controllers can be selected according to the needs. It can be independently connected to the point light source circuit board 24. A connecting wire is provided between the light source circuit boards of the two sets of point light source assemblies 2 to realize electrical connection, one of which is an external connecting plug.

[0043] like Figures 4 to 7 As shown, the lens assembly 25 in this embodiment includes a lens base 251, a first lens 252, and a second lens 253. The lens base 251 is a hollow tubular structure. A first mounting cavity 221 is formed at the front end of the point light source base 22. The rear end of the lens base 251 is inserted into and fixed relative to the first mounting cavity 221. Specifically, the lens base 251 and the point light source base 22 are respectively provided with matching second mounting holes 2511 and third mounting holes 222. During assembly, they can be directly locked and fixed relative to each other by screws, etc. A first snap-fit ​​portion 251 is formed on the inner wall of the lens base 251. 2. The first lens 252 and the second lens 253 are respectively snapped onto the first snap-fit ​​portion 2512 and the second snap-fit ​​portion 2513. Preferably, the inner diameter of the first snap-fit ​​portion 2512 matches the outer diameter of the first lens 252 or is slightly smaller than the outer diameter of the first lens 252. The snap-fit ​​is achieved by the interference fit between the first lens 252 and the first snap-fit ​​portion 2512. Similarly, the inner diameter of the second snap-fit ​​portion 2513 matches the outer diameter of the second lens 253 or is slightly smaller than the outer diameter of the second lens 253. The snap-fit ​​is achieved by the interference fit between the second lens 253 and the second snap-fit ​​portion 2513.

[0044] As a preferred embodiment, to further enhance the sealing and connection stability of the first lens 252 and the second lens 253, a first sealing member 254 and a second sealing member 255 are also provided. Both the first sealing member 254 and the second sealing member 255 are O-rings made of silicone material. The first sealing member 254 is disposed at the abutment point between the first lens 252 and the first snap-fit ​​portion 2512 to fill the gap at the abutment point, improving the sealing performance around the first lens 252 and the firmness of the snap-fit. The second sealing member 255 is disposed at the abutment point between the second lens 253 and the second snap-fit ​​portion 2513 to fill the gap at the abutment point, improving the sealing performance around the second lens 253 and the firmness of the snap-fit. This improves the fixation and dust and water resistance of both lens sets.

[0045] This embodiment also includes a cover plate 256, which is provided with a second mounting cavity 2561. A third snap-fit ​​part 2562 is provided on the second mounting cavity 2561. The front end of the lens main seat 251 is inserted into the second mounting cavity 2561, so that the front end of the first lens 252 abuts against the third snap-fit ​​part 2562.

[0046] In this embodiment, the first lens 252 is a biconvex lens, and the second lens 253 is a hemispherical lens. The light from the LED bead 241 is diffused by the second lens 253, and the beam is focused by the first lens 252, so that the light is more evenly irradiated onto the target area, thereby improving the detection accuracy and the applicability of the light source.

[0047] like Figure 1 , Figure 4 and Figure 8 As shown, the heat dissipation assembly 23 includes a heat dissipation base 231, a U-shaped fixing member 232, and a heat dissipation fan 233. The heat dissipation base 231 is an aluminum heat dissipation shell, and the heat dissipation base 231 is detachably connected to the main base 22 of the point light source. The point light source circuit board 24 is detachably connected to the heat dissipation base 231. The U-shaped fixing member 232 is connected to the heat dissipation base 231, so that a third installation space 234 is formed between the U-shaped fixing member 232 and the heat dissipation base 231. The heat dissipation fan 233 is disposed in the third installation space 234 and is fixed relative to the U-shaped fixing member 232. The heat dissipation fan 233 is a turbine fan.

[0048] Specifically, the aforementioned U-shaped fastener 232 includes two connecting arms 2321 and a fixing part 2322 connected to the two connecting arms 2321. The two connecting arms 2321 are fixedly connected to the upper and lower ends of the heat dissipation base 231, respectively, so that the fixing part 2322 is away from the heat dissipation base 231. That is, the two connecting arms 2321, the fixing part 2322 and the heat dissipation base 231 together form the aforementioned third installation space 234. The rear side of the heat dissipation base 231 extends toward the third installation space 234 to form a plurality of heat dissipation fins 2311. The cooling fan 233 is fixed to the inner wall of the fixing part 2322 and faces the heat dissipation fins 2311. Preferably, a first through hole 2323 is provided on the fixing part 2322. The inner side of the first through hole 2323 is opposite to the cooling fan 233, and a metal mesh 2324 is provided on the outer side of the first through hole 2323.

[0049] The working principle of this invention: This invention uses a strobe drive controller to achieve high-current pulse drive of a high-efficiency LED bead 241. The LED bead 241 operates in strobe mode, emitting an extremely strong pulse of light only at the instant of camera exposure (microseconds). Figure 9 As shown, the light from the LED bead 241 is diffused by the second lens 253, and then the beam is focused by the first lens 252 to make the light more evenly illuminate the target area, thereby improving the detection accuracy and the applicability of the light source. In particular, this utility model uses two sets of tilted point light source combination 2 to achieve the combination of focusing of the two sets of light sources, which can improve the instantaneous brightness, effectively "freeze" the high-speed moving electrode and clearly highlight the burr characteristics, while having excellent heat dissipation performance and stability.

[0050] In terms of heat dissipation, this utility model uses a nano-thermal conductive ceramic substrate to effectively conduct the heat generated by the LED lamp bead 241, and uses an aluminum heat sink shell with multiple heat dissipation fins 2311 to increase the heat dissipation area; and integrates a dual ball bearing fan for forced air cooling, forming a high-efficiency active heat dissipation system, which combines the aluminum heat sink shell and the turbine fan for heat dissipation.

[0051] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-brightness flash source for detecting burrs on lithium battery electrodes, characterized in that, include: A mounting base (1) is provided, on which an assembly position (11) is formed; Two point light source combinations (2) are inclinedly arranged on the fixed base (1) so that the emitted light rays of the two point light source combinations (2) intersect. Each point light source combination (2) includes: a strobe drive controller, a point light source main base (22) arranged on the assembly position (11), and a heat dissipation component (23) arranged at the rear end of the point light source main base (22). A point light source circuit board (24) connected to the strobe drive controller is arranged on the point light source main base (22). An LED lamp bead (241) is arranged on the point light source circuit board (24). A lens assembly (25) is connected to the front end of the point light source main base (22). The LED lamp bead (241) faces the lens assembly (25).

2. The high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 1, characterized in that, The lens assembly (25) includes a lens base (251), a first lens (252), and a second lens (253). The lens base (251) is a hollow tubular structure. A first mounting cavity (221) is formed at the front end of the point light source base (22). The rear end of the lens base (251) is inserted into the first mounting cavity (221) and fixed relative to it. A first snap-fit ​​part (2512) and a second snap-fit ​​part (2513) are formed on the inner wall of the lens base (251). The first lens (252) and the second lens (253) are respectively snapped onto the first snap-fit ​​part (2512) and the second snap-fit ​​part (2513).

3. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 2, characterized in that, It also includes a first seal (254) and a second seal (255), the first seal (254) being disposed at the abutment of the first lens (252) and the first snap-fit ​​portion (2512), and the second seal (255) being disposed at the abutment of the second lens (253) and the second snap-fit ​​portion (2513).

4. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 3, characterized in that, The first seal (254) and the second seal (255) are both O-rings made of silicone material.

5. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 4, characterized in that, It also includes a cover plate (256), which is provided with a second mounting cavity (2561). A third snap-fit ​​part (2562) is provided on the second mounting cavity (2561). The front end of the lens main seat (251) is inserted into the second mounting cavity (2561) so that the front end of the first lens (252) abuts against the third snap-fit ​​part (2562).

6. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 2, characterized in that, The first lens (252) is a biconvex lens, and the second lens (253) is a hemispherical lens.

7. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 1, characterized in that, The angle between the extended axes (21) of the two point light source combinations (2) is θ, where θ ≤ 90°.

8. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 1, characterized in that, The heat dissipation assembly (23) includes a heat dissipation base (231), a U-shaped fastener (232), and a heat dissipation fan (233). The heat dissipation base (231) is detachably connected to the main base (22) of the point light source. The point light source circuit board (24) is detachably connected to the heat dissipation base (231). The U-shaped fastener (232) is connected to the heat dissipation base (231), so that a third installation space (234) is formed between the U-shaped fastener (232) and the heat dissipation base (231). The heat dissipation fan (233) is disposed in the third installation space (234) and is fixed relative to the U-shaped fastener (232).

9. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 8, characterized in that, The U-shaped fastener (232) includes two connecting arms (2321) and a fixing part (2322) connected to the two connecting arms (2321). The two connecting arms (2321) are fixedly connected to the upper and lower ends of the heat dissipation base (231) respectively, and the heat dissipation fan (233) is fixed to the inner wall of the fixing part (2322).

10. A high-brightness flash source for detecting burrs on lithium battery electrodes according to claim 9, characterized in that, A first through hole (2323) is provided on the fixing part (2322). The inner side of the first through hole (2323) is opposite to the cooling fan (233), and a metal mesh (2324) is provided on the outer side of the first through hole (2323).

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