Pole inspection device and inspection method

Abstract

A pole inspection device and inspection method. The pole inspection device (100) comprises image collection devices (10), a first light source, and a second light source; the image collection devices (10) are movably arranged and have a first position where an extreme pole (200) is inspected and a second position where a minimalistic pole (400) is inspected; the first light source is provided on one side of the image collection devices (10) and is configured to emit first light towards at least one side surface of the extreme pole (200) in the first position of the image collection devices (10); the second light source is configured to be arranged above the image collection devices (10) and surrounds the minimalistic pole (400); and the second light source is configured to emit second light towards the minimalistic pole (400) in the second position of the image collection devices (10).

Description

Pole detection device and detection method thereof

[0001] This application claims priority to Chinese patent application No. 202311649224.0 filed on December 1, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the technical field of battery testing, and in particular to a pole detection device and a detection method thereof. Background Art

[0003] During the lithium battery production process, basic quality inspections are required to improve product yield. For example, the battery terminals require a visual inspection of their sides, primarily to check for defects such as plastic burns, scratches, metal leaks, and terminal wiredrawing. However, current terminal visual inspection equipment can only inspect one terminal type, limiting its applicability.

[0004] Application Contents

[0005] The main purpose of this application is to provide a pole detection device, aiming to improve the applicability of the pole detection device and save space.

[0006] To achieve the above objectives, the pole detection device proposed in this application includes:

[0007] An image acquisition device, the image acquisition device being movably arranged and having a function of detecting a first position of the extreme pole and a second position of the minimal pole; and

[0008] a first light source, disposed on one side of the image acquisition device and configured to emit light toward at least one side of the pole and to reflect the light normally into the image acquisition device; and

[0009] The second light source is configured to be arranged above the image acquisition device and arranged around the circumference of the minimalist pole. The second light source is configured to emit a second light toward the minimalist pole when the image acquisition device is located at the second position.

[0010] In the aforementioned pole detection device, the first and second light sources are positioned in the same workstation, allowing the image capture device to be flexibly positioned to adjust for different poles. For example, to capture images of extreme poles, the first light source is located on one side of the image capture device and configured to provide detection light for the pole, thereby improving image capture quality. This allows the image capture device to detect different pole types, simplifying the structure and saving space.

[0011] In one embodiment of the present application, the first light source is a bar-shaped light source; the extreme pole includes four sequentially connected side surfaces;

[0012] There are at least two image acquisition devices, and the at least two image acquisition devices are spaced apart and respectively located at the top corners of the limiting pole. Each image acquisition device correspondingly captures an image of one side of the limiting pole. The projection of the strip light source on the horizontal plane is arranged at an angle to the side of the limiting pole, and is configured to provide detection light for the at least two image acquisition devices.

[0013] Here, providing at least two image acquisition devices allows simultaneous inspection of at least two sides of the pole, thereby improving pole inspection efficiency and facilitating the realization of a fly-by-fly photography effect. Furthermore, the high brightness of the strip light source allows all emitted light to be reflected orthogonally into the image acquisition device, further enhancing exposure and highlighting defects such as metal wire drawing, scratches, or burns, thereby improving detection accuracy. Furthermore, the strip light source can be matched to the pole size, reducing material costs.

[0014] In one embodiment of the present application, there are two bar-shaped light sources, which are respectively located on opposite sides of the extreme pole. There are four image acquisition devices, which are respectively located at two vertex positions of the extreme pole. The outgoing light of each bar-shaped light source is reflected normally into the two image acquisition devices.

[0015] By setting up two strip light sources and four image acquisition devices, all sides of the extreme pole can be detected at the same time, which can further improve the flying shooting effect.

[0016] In one embodiment of the present application, the centers of the two bar-shaped light sources, the central axes of the four image acquisition devices, and the centers of the extreme poles in the vertical direction are on the same horizontal plane.

[0017] The above setting can improve the utilization rate of the strip light source, ensure that most of the light can be reflected normally into the image acquisition device, and improve the detection effect.

[0018] In one embodiment of the present application, a normal line of the surface of the strip-shaped light source and a normal line of a side surface of the extreme pole are arranged at a first angle, and the first angle is 28°±5°;

[0019] And / or, the end of the strip light source closest to the movement axis of the limit pole is set as the limiting end, and the distance between the limiting end and the movement axis of the limit pole is 60 mm±5 mm.

[0020] Here, the angle setting of the strip light source can ensure that the detection light of the two image acquisition devices is taken into account, saving material costs;

[0021] The position of the strip light source away from the extreme pole can improve the utilization rate of the light source and ensure the brightness of the detection light.

[0022] In one embodiment of the present application, the second light source is a ring-shaped light source having at least two brightness channels. The number of the image acquisition devices is at least two, and at least two of the image acquisition devices are evenly spaced around the circumference of the minimalist pole. The projection of the central axis of each image acquisition device on a vertical plane is arranged at an angle to the side of the minimalist pole.

[0023] The ring light source provides better detection light for the image acquisition device, ensuring that all sides of the pole can capture good images. At least two image acquisition devices are also provided to improve detection efficiency. The provision of at least two brightness channels can provide different brightness detection for different polarities of the minimalist pole, thereby improving detection results and saving energy.

[0024] In one embodiment of the present application, the distance between the surface of the annular light source facing the minimalist pole and the surface of the minimalist pole facing the annular light source is in the range of 45 mm±5 mm.

[0025] The above distance range setting can ensure the brightness of the light source and improve the image acquisition effect.

[0026] In one embodiment of the present application, the distance between the lens of the image acquisition device and the side surface of the minimalist pole is in the range of 100 mm ± 10 mm;

[0027] And / or, the central axis of the image acquisition device forms a second angle with the side surface of the minimalist pole, and the second angle is 15°±5°.

[0028] The distance range of the image acquisition device can ensure the viewing angle of its image acquisition to expand the detection range of the minimalist pole;

[0029] The angle range between the central axis of the image acquisition device and the side of the minimalist pole can achieve flexible adjustment of the angle on the basis of meeting the imaging light intensity, and then change the field of view according to the object being measured.

[0030] The present application also provides a detection method for a pole detection device, wherein the pole detection device includes a first light source, a second light source, and an image acquisition device. The detection method includes:

[0031] Transport batteries at a preset speed;

[0032] Controlling and detecting the type of the battery pole;

[0033] According to the type of the pole, controlling the image acquisition device to switch between a first position and a second position, then controlling the first light source or the second light source to be turned on for a preset time, and simultaneously controlling the image acquisition device to capture a side image of the pole;

[0034] Acquire and identify the side image of the pole, and be configured to obtain defect parameters of the side image;

[0035] Based on the defect parameters of the image, a detection result of the pole is determined.

[0036] Here, different light sources are selected according to the pole type to provide detection light, and the image acquisition device is set at a more accurate position, so that side defect detection of different poles can be carried out in a targeted manner, the detection accuracy can be improved, and the judgment efficiency can be improved.

[0037] In one embodiment of the present application, the preset speed range is less than or equal to 500 m / s.

[0038] The preset speed in this range can be adapted to the shooting duration of the image acquisition device, thereby achieving flying shooting.

[0039] In one embodiment of the present application, the steps of controlling the image acquisition device to switch between a first position and a second position according to the type of the pole, controlling the first light source or the second light source to be turned on for a preset duration, and simultaneously controlling the image acquisition device to acquire a side image of the pole include:

[0040] determining that the pole is a limit pole, controlling the image acquisition device to be in a first position, controlling the first light source to be turned on for a preset time, and controlling the image acquisition device to acquire a side image of the pole;

[0041] It is determined that the pole is a minimalist pole, the image acquisition device is controlled to be in a second position, the second light source is controlled to be turned on for a preset time, and the image acquisition device is controlled to obtain a side image of the pole.

[0042] Here, for extreme poles, selecting the first light source for regular reflection to provide inspection light can improve exposure, thereby making defect features more obvious and improving detection accuracy. For minimal poles, the second light source can provide two different brightness channels for poles of different colors, ensuring that each pole has the most appropriate inspection light, thereby improving image acquisition.

[0043] In one embodiment of the present application, the minimalist pole includes a positive pole and a negative pole, and the pole detection device further includes a light source control component;

[0044] The step of determining that the pole is a minimalist pole, controlling the image acquisition device to be in a second position, controlling the second light source to be turned on for a preset time, and controlling the image acquisition device to acquire a side image of the pole includes:

[0045] Determining that the pole is a minimalist pole, controlling the image acquisition device to be in a second position, and detecting the polarity of the minimalist pole;

[0046] If it is determined that the minimalist pole is a positive pole, an instruction is sent to the light source control component, which is configured to control the second light source to start according to the first preset power;

[0047] If it is determined that the minimalist pole is a negative pole, an instruction is sent to the light source control component, which is configured to control the second light source to start according to a second preset power; wherein the first preset power is greater than the second preset power.

[0048] The positive pole is black and is insensitive to light, so increasing the power of its detection light can provide better brightness and facilitate image acquisition. The negative pole is yellow and reflects light normally. A relatively small power can be selected to start the second light source, thereby improving detection accuracy and saving energy.

[0049] In one embodiment of the present application, the first preset power is 100w±10w, and the second preset power is 35w±10w.

[0050] The light source within this power range can provide good detection light for the positive column and the negative column respectively, thereby improving the detection effect.

[0051] In one embodiment of the present application, the step of acquiring and identifying the side image of the pole, configured to obtain defect parameters of the side image, includes:

[0052] Acquire the side image and segment the side image, and be configured to acquire a defect area;

[0053] The defect area is compared according to the defect model and is configured to determine defect parameters, where the defect parameters include at least one of defect type, defect size, and defect grayscale value.

[0054] Here, by segmenting the image, it is easier to obtain the defect area and confirm the defect parameters.

[0055] In one embodiment of the present application, the step of determining the detection result of the pole based on the defect parameters of the image includes:

[0056] Comparing the preset defect parameters with the defect parameters of the side image;

[0057] If they are consistent, the terminal is determined to be unqualified and the battery containing the terminal is discarded;

[0058] If they are inconsistent, it is determined that the pole is qualified.

[0059] The pole is judged as qualified or unqualified according to the preset defect parameters, thereby improving the judgment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0061] FIG1 is a schematic structural diagram of an embodiment of a pole detection device of the present application;

[0062] FIG2 is a top view of the pole detection device shown in FIG1 with the second light source omitted;

[0063] FIG3 is a schematic structural diagram of another embodiment of the pole detection device of the present application;

[0064] FIG4 is a front view of the pole detection device shown in FIG3 with the first light source omitted;

[0065] FIG5 is a flow chart of an embodiment of a detection method of a pole detection device of the present application.

[0066] Description of Figure Numbers:

[0067] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0069] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0070] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or a solution in which both A and B are satisfied. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0072] Batteries mentioned in this field can be categorized as either disposable or rechargeable, depending on whether they are rechargeable. Common rechargeable battery types include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries are widely used in pure electric and hybrid vehicles. While their capacity is relatively low, they offer higher output, higher charging current, and a longer service life, albeit at a higher cost.

[0073] The batteries described in the embodiments of this application are rechargeable batteries. The following description of the embodiments disclosed herein primarily uses lithium-ion batteries as an example. It should be understood that the embodiments disclosed herein are applicable to any other appropriate type of rechargeable battery. The batteries described in the embodiments disclosed herein can be directly or indirectly used in appropriate devices to power such devices.

[0074] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells, batteries, etc. disclosed in the present application can be used to form the electrical device. The embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0075] The battery mentioned in the embodiments disclosed in this application refers to a single physical module that includes one or more battery cells to provide a predetermined voltage and capacity. A battery cell is the basic unit in a battery, which includes a positive electrode sheet, a negative electrode sheet, an electrolyte, and a separator. Lithium-ion battery cells mainly rely on the movement of lithium ions between the positive electrode sheet and the negative electrode sheet to work. Generally, they can be divided into cylindrical battery cells, rectangular battery cells, and soft-pack battery cells according to the packaging method. The following will mainly focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0076] After the production of rectangular batteries is completed, there may be many problems with the shell and battery terminals, such as scratches, grooves, protrusions caused by dirt and impurities, or surface brushing. In order to prevent batteries with serious defects on the terminals from flowing into subsequent processes and to ensure the production quality and safety performance of the final batteries, it is necessary to perform appearance inspections on the batteries and terminals, and determine whether there are defects based on the collected images.

[0077] There are two main types of poles: minimalist poles and extreme poles. Minimalist poles are square or round, partially covered in plastic. Extreme poles, on the other hand, have a layered structure, with a lower plastic layer and an upper metal layer. However, current pole appearance inspection devices are only capable of inspecting one type of pole, resulting in limited applicability.

[0078] Therefore, to address the low applicability of related technologies, the present application improves a pole detection device. By combining a first light source with a second light source and making the image acquisition device movable, different types of poles can be detected at the same detection position, improving applicability and saving space.

[0079] 1 to 3 , in one embodiment of the present application, a pole detection device 100 includes an image acquisition device 10, a first light source, and a second light source. The image acquisition device 10 is movably disposed and has a first position for detecting the extreme pole 200 and a second position for detecting the minimalist pole 400. The first light source is disposed on one side of the image acquisition device 10 and is configured to emit a first light beam toward at least one side surface of the extreme pole when the image acquisition device is in the first position. The second light source is disposed above the image acquisition device 10 and is disposed around the minimalist pole 400. The second light source is configured to emit a second light beam toward the minimalist pole when the image acquisition device 10 is in the second position.

[0080] The image acquisition device 10 can be an area array camera, a 3D camera, or a 2D camera, and there is no limitation here. It only needs to have the function of image acquisition. The image acquisition device 10 is located on the circumference of the pole 200, which means that when the pole is located at the detection station, the image acquisition device 10 is located on the circumference thereof and is mainly configured to obtain a side image of the pole. The detection station here refers to the position where the pole 200 to be detected is placed, which is set according to the imaging distance and field of view of the image acquisition device 10. The image acquisition device 10 can be movably set, that is, the relative position and angle between the center of its lens and the center of the pole can be changed. There can be multiple image acquisition devices 10, which are arranged around the circumference of the extreme pole 200; or there can be only one, which is set to be movable so as to detect all sides of the extreme pole 200, and there is no limitation here.

[0081] The first and second light sources are configured to provide detection light to the image acquisition device 10 to enhance the image acquisition effect. The first light source is configured to emit a first light beam when the image acquisition device 10 is in the first position, thereby assisting the image acquisition device 10 in capturing images of the extreme pole and improving the quality of the obtained image. The detection light beam can be white light. The first light source is disposed on one side of the image acquisition device 10. The first light source can be a backlight having multiple LEDs arranged in a matrix, a bar light source 30, or a coaxial light source, etc., without limitation herein, as long as the multiple LEDs are in the same plane and emit light in the same direction.

[0082] The second light source is located above the inspection station, specifically above minimalist pole 400, and is configured to assist in capturing images of the side surfaces of minimalist pole 400. Minimalist pole 400 is a plastic-wrapped metal structure, so image capture device 10 primarily detects defects on the plastic surface. Minimalist pole 400 generally has a circular cross-section. Therefore, the second light source is arranged around the circumference of minimalist pole 400, providing inspection light at various locations on the minimalist pole 400.

[0083] The second light source and the first light source are independently provided but are both located at the same inspection station. Furthermore, the movable arrangement of the image acquisition device 10 allows the first and second light sources to share the same set of image acquisition devices 10. In this way, the image acquisition device 10 is adjusted in position for different poles. By using the first light source or the second light source accordingly, different types of poles can be inspected respectively. The two light sources can be spatially combined, simplifying the structure and saving stations and space.

[0084] Moreover, the current detection devices for extreme poles usually use annular light sources, and the light emitted by them is diffusely reflected, resulting in the light not being able to accurately enter the image acquisition device. In particular, for some small defects such as protrusions or grooves, they cannot be clearly highlighted in the image, thereby degrading the imaging quality and resulting in inaccurate detection, which seriously affects the production quality and safety performance of the final battery.

[0085] In one embodiment of the present application, the first light source is a bar-shaped light source 30, and the limiting pole 200 includes four sequentially connected side surfaces. There are at least two image acquisition devices 10, and at least two of the image acquisition devices 10 are spaced apart and located at the vertex of the limiting pole 200. Each image acquisition device 10 captures an image of a side surface of the limiting pole 200. The projection of the bar-shaped light source 30 on a horizontal plane is arranged at an angle to the side surface of the limiting pole 200 to provide detection light for the at least two image acquisition devices 10.

[0086] The bar light source 30 has high output brightness and is typically a high-brightness bar light source 30. It is composed of a high-density, in-line LED array and is suitable for large-format inspection. The illumination angle can also be freely adjusted. The high-brightness bar light source 30 offers high illumination uniformity, high brightness, good heat dissipation, a long service life, and high product stability. It is also simple to install and has an adjustable angle, making it more flexible in application. Here, the first light source is set as a bar light source 30, providing light based on the principle of regular reflection to the extreme pole. The image acquisition device 10 can capture most of the light from the first light source, improving exposure and achieving overexposure to enhance defect visibility. Specifically, defects such as metal wire drawing or scratches are more prominent, thereby improving inspection efficiency and accuracy. Here, light based on the principle of regular reflection refers to light emitted by the first light source being regularly reflected into the image acquisition device 10. Regular reflection is characterized by the light's incident angle and reflection angle being the same and located in the same plane, with the incident light intensity being equal to the reflected light intensity. This improves the exposure of the image captured by the image acquisition device 10. The upper layer of the limit pole 200 is metal, and the defective location will appear obviously dark, which further highlights defects such as metal brushing, scratches or burns, thereby improving the detection accuracy.

[0087] As will be appreciated, the limiting pole 200 is generally a square prism structure having four sides. More specifically, its cross-section is rectangular. Here, providing at least two image acquisition devices 10, for example, two, three, or four, allows for simultaneous detection of at least two sides of the limiting pole 200, thereby improving detection efficiency of the limiting pole 200. At the same time, the image acquisition device 10 is located at the top corner of the limiting pole 200, and the projection of the strip light source 30 on the horizontal plane forms an angle with the side of the limiting pole 200. That is, when the top surface of the limiting pole 200 is facing the vertical direction, when the pole detection device 100 is projected onto the horizontal plane, the image acquisition device 10 and the strip light source 30 are both arranged at an angle with the side of the pole, and the emitted light and the received light can form a symmetrical structure with the perpendicular bisector of the side of the limiting pole 200 as the symmetry line. This is more conducive to all the light emitted by the strip light source 30 being reflected normally from the side of the limiting pole 200 and entering the image acquisition device 10, thereby improving the exposure of the image through the high brightness and further improving the accuracy of the detection.

[0088] In addition, the length of the strip light source 30 is long enough to take into account the image acquisition devices 10 located at the two vertex corners. The emitted light is reflected by the two adjacent side surfaces of the extreme pole 200 and enters the two image acquisition devices 10, thereby simplifying the structure and facilitating assembly.

[0089] Referring to Figures 1 and 2 , in one embodiment of the present application, two bar-shaped light sources 30 are provided, and the two bar-shaped light sources 30 are located on opposite sides of the limiting pole 200 , respectively. Four image acquisition devices 10 are provided, and two of the image acquisition devices 10 are located at two vertex positions of the limiting pole 200 , respectively. The light emitted by each bar-shaped light source 30 is normally reflected into the two image acquisition devices 10 .

[0090] In this example, based on the principle that one bar light source 30 provides detection light for two image acquisition devices 10, two bar light sources 30 and four image acquisition devices 10 are provided. The two bar light sources 30 are located on opposite sides of the limiting pole 200, or at two corners of the limiting pole 200. The four image acquisition devices 10 are grouped in pairs and located at the other two corners of the limiting pole 200. The viewing angle of each image acquisition device 10 is set to greater than 90 degrees, thereby simultaneously detecting all four sides of the limiting pole 200, achieving comprehensive detection and improving detection efficiency. In other examples, four bar light sources 30 may also be provided, with one bar light source 30 corresponding to one image acquisition device 10, thereby conforming to the positional arrangement of regular reflection.

[0091] In one example, when a limit pole 200 to be inspected is being transported by a conveyor, the image capture device 10 can capture side images of the limit pole 200 from all directions when it arrives at the inspection station, depending on the conveyor speed. This improved exposure allows for better visualization of various defects, significantly reducing the time the limit pole 200 spends at the inspection station. This allows for on-the-fly image capture, where the conveyor maintains its original speed without stopping. This reduces inspection time, maximizes coordination with production schedules, and improves production efficiency. It also avoids frequent startups and shutdowns of the conveyor, extending its service life.

[0092] In one embodiment of the present application, the centers of the two bar-shaped light sources 30 , the central axes of the four image acquisition devices 10 , and the center of the limiting pole 200 in the vertical direction are on the same horizontal plane.

[0093] In this example, the vertical centers of the strip light source 30, the four image acquisition devices 10, and the limiting pole 200 are all located on the same horizontal plane. Here, the center of the strip light source 30 refers to the center of its geometric shape in the vertical direction, and the vertical center of the image acquisition device 10 refers to the axial position of its lens. Due to the divergence of light, this structural setting can ensure that most of the light from the strip light source 30 is directed toward the side of the limiting pole 200, and most of the light can be reflected normally into the image acquisition device 10, thereby improving the utilization rate of the strip light source 30 and enhancing the detection effect.

[0094] 2 , in one embodiment of the present application, a first angle α is formed between the normal line of the surface of the strip light source 30 and the normal line of a side surface of the limiting electrode 200 , and the first angle α is 28°±5°.

[0095] And / or, the end of the strip light source 30 closest to the movement axis of the limit pole 200 is set as the limiting end, and the distance D1 between the limiting end and the movement axis of the limit pole 200 is 60 mm±5 mm.

[0096] Here, the normal to the surface of the bar light source 30 refers to a line perpendicular to the surface of the bar light source 30 and passing through its center. The normal to a side surface of the limiting pole 200 refers to a line perpendicular to the side surface of the limiting pole 200 and passing through its center. The two normal lines are set at an angle, that is, at a first angle α within the same horizontal plane. The first angle can be 28°±5°, for example, 23°, 25°, 28°, 30°, or 32°. This angle ensures that detection light from both image acquisition devices 10 is taken into account, saving material costs. Here, the angles of the two bar light sources 30 relative to the side surface of the limiting pole 200 can be the same or different, and are not limited here. The angle between the image acquisition device 10 and the side surface of the limiting pole 200 can be set according to the first angle, so that the image acquisition device 10 can receive light from the bar light source 30 via regular reflection. For example, the angle between the lens axis of one image acquisition device 10 and the normal of one side of the limiting pole 200 is 35°±5°, while the angle between the lens axis of another image acquisition device 10 and the normal of the other side of the limiting pole 200 is 43°±5°. Furthermore, the angle and position of the image acquisition device 10 can be fine-tuned according to imaging needs to improve imaging quality.

[0097] On the basis of limiting or not limiting the angle between the strip light source 30 and the side of the limit pole 200, the strip light source 30 is set to have an end closest to the moving axis of the limit pole 200 as the limiting end, and the distance between the limiting end and the moving axis of the limit pole 200 is D1. The value of D1 is 60 mm ± 5 mm, for example, 55 mm, 57 mm, 60 mm, 62 mm, 63 mm, 65 mm, etc., so that it can be adjusted according to the size of the pole to be detected, thereby improving the brightness of the detection light provided by the strip light source 30, thereby further improving the imaging effect.

[0098] The distance between the lens of the image acquisition device 10 and the center of the side surface of the detected extreme pole 200 can be adjusted and set. The distance between the two is D2. The range of D2 is 100mm±10mm, for example, 95mm, 97mm, 100mm, 102mm, 105mm, etc., which can meet the shooting angle and detection accuracy.

[0099] 3 and 4 , in one embodiment of the present application, the second light source is a ring-shaped light source 50 having at least two brightness channels. There are at least two image acquisition devices 10 , which are evenly spaced around the minimalist pole 400 . The projection of the central axis of each image acquisition device 10 on a vertical plane forms an angle with the side surface of the minimalist pole 400 .

[0100] In this example, the second light source is a ring light source 50, which can evenly emit detection light around the minimalist pole 400, providing more uniform detection light for the image acquisition device 10, enabling better image capture from all sides of the minimalist pole 400. In other examples, the second light source can also be at least three bar light sources 30, spaced apart and arranged in a ring above the minimalist pole 400, thereby replacing the function of the ring light source 50. Furthermore, there are at least two image acquisition devices 10, evenly spaced apart around the minimalist pole 400. The number of image acquisition devices 10 can be set based on the number of image acquisition devices 10 and the viewing angle of each image acquisition device 10, enabling simultaneous image capture of all sides of the minimalist pole 400, thereby improving detection efficiency. For example, four image acquisition devices 10 are provided, and the viewing angle of each image acquisition device 10 is 90°, so that the entire circumference of the minimalist pole 400 can be covered to achieve comprehensive detection. The setting of this structure is also conducive to flying shooting, that is, the detection of the minimalist pole 400 can be achieved without stopping the machine.

[0101] Since the positive and negative poles of the minimalist pole 400 have different colors, the requirements for detection light are also different. Here, the second light source is set to have at least two brightness channels, that is, two brightness values, which can be converted by adjusting its voltage or power, so as to provide corresponding brightness for poles with different polarities, thereby improving the flexibility of light source brightness adjustment when taking pictures, and improving the brightness of the side of the minimalist pole 400, so that the contrast of imaging defects is improved, that is, the detection rate of defects such as burns, breakage, and scratches on the minimalist pole 400 plastic is improved.

[0102] In one embodiment of the present application, the distance between the surface of the annular light source 50 facing the minimalist pole 400 and the surface of the minimalist pole 400 facing the annular light source 50 is in the range of 45 mm±5 mm.

[0103] The above distance range setting can ensure the brightness of the light source and improve the effect of image acquisition. In one example, one end face of the annular light source 50 is set parallel to the surface of the minimalist pole 400, and the distance between the two surfaces is D3. The value of D3 is 40mm, 42mm, 45mm, 47mm, 50mm, etc.

[0104] Referring to FIG. 4 , in one embodiment of the present application, the distance between the lens of the image acquisition device 10 and the side surface of the minimalist pole 400 is D4 , and the range of D4 is 100 mm ± 10 mm;

[0105] And / or, the central axis of the image acquisition device 10 forms a second angle with the side surface of the minimalist pole 400, and the second angle is 15°±5°.

[0106] The distance between the lens of the image acquisition device 10 and the center of the side surface of the detected extreme pole 200 can be adjusted and set. The distance between the two is D4, and the range of D4 is 100mm±10mm, for example, 95mm, 97mm, 100mm, 102mm, 105mm, etc., which can meet the shooting angle and detection accuracy.

[0107] On the basis of limiting or not limiting the distance between the image acquisition device 10 and the side of the minimalist pole 400, the central axis thereof is set to form a second angle β with the side of the minimalist pole 400. The range value of β is 15°±5°, for example, 10°, 12°, 15°, 17° or 20°, etc., which can achieve flexible adjustment of the angle on the basis of satisfying the imaging light intensity, thereby changing the field of view according to the object to be measured, and adjusting the optimal imaging effect according to the defect characteristics.

[0108] Referring to FIG. 5 , the present application further proposes a detection method of a pole detection device 100 , wherein the pole detection device 100 includes a first light source, a second light source, and an image acquisition device. The detection method includes:

[0109] S1: transporting the battery 600 at a preset speed;

[0110] S2: Control and detect the type of the electrode of the battery 600;

[0111] S3: Controlling the image acquisition device 10 to switch between a first position and a second position according to the type of the pole, controlling the first light source or the second light source to be turned on for a preset time, and controlling the image acquisition device 10 to capture a side image of the pole;

[0112] S4: Acquire and identify the side image of the pole to obtain defect parameters of the side image;

[0113] S5: Determine the detection result of the pole based on the defect parameters of the image.

[0114] The detection method can be controlled by a host computer. For example, it acts as a master controller to obtain the image of the pole captured by the image acquisition device 10, analyze and process it, and determine whether the pole is qualified. In step S1, the battery 600 can be transported by a conveyor, and the battery 600 can be placed on the conveyor by a material-picking structure such as a manipulator, and reach the detection station with the conveyor. The preset speed here is the operating speed of the conveyor, which can be set as needed to improve the detection efficiency and achieve a flying shooting effect. The shooting time of the image acquisition device 10 and the exposure time of the first light source and the second light source can be adapted and selected according to the preset speed to achieve a flying shooting effect. In step S2, the type of pole of the battery 600 detected can be controlled by a reading mechanism, such as a wireless radio frequency automatic identification device, or a barcode scanner, which is not limited here. The judgment method is to judge based on the template of the pole. For example, the minimalist pole 400 is round or square, and the extreme pole 200 is square and has an upper and lower layered structure. The information of the battery 600 is read by the reading mechanism to obtain the type of the pole of the battery 600, so as to determine the scheme for detecting the pole of the battery 600 and improve the detection efficiency. In step S3, after determining the type of pole, the image acquisition device 10 is controlled to move to the first position or the second position to provide a suitable angle and distance, and when the pole reaches the detection station, the first light source or the second light source is controlled to turn on for a preset time. The preset time can be set according to the shooting time of the image acquisition device 10 to improve the imaging effect. At the same time, controlling the image acquisition device 10 to perform image acquisition is conducive to achieving flying shooting. In other examples, when the production lines all have the same type of poles, this step can be ignored.

[0115] In step S4, the side image of the pole can be acquired by the lower computer, for example, by sending an acquisition instruction to the lower computer, and the lower computer sends the image information received from the image acquisition device 10 to the upper computer. In other examples, the side image of the pole can also be acquired directly from the image acquisition device 10. Since the defect types of the minimalist pole 400 are mostly plastic defects, and the defect types of the extreme pole 200 are mostly metal defects, the defect parameters of the image can be determined according to a preset corresponding table, and the defect parameters include at least one of the defect type, defect size, and defect grayscale value. In step S5, based on the defect parameters of the image, the degree of influence of the defect on the quality of the pole is finally determined, and the detection result of the pole is output. The detection result is divided into qualified and unqualified.

[0116] This detection method classifies poles according to their type, enabling more targeted detection and improving detection efficiency. Different light sources are selected based on pole type to provide detection light, and the image acquisition device 10 is positioned more accurately, enabling targeted detection of side defects on different poles. This improves detection accuracy and is applicable to different pole types, enhancing applicability.

[0117] It is understandable that the pole detection device 100 can be executed under the control of a lower computer, that is, a programmable logic controller (PLC), so the conveying device and the manipulator, the image acquisition device 10 and the light source are all electrically connected to the PLC. Of course, the determination of the pole type can be controlled by the upper computer, which is a carrier of software that can send instructions to the lower computer and read and process various data. The reading mechanism is electrically connected to the upper computer, and by obtaining the feedback result of the reading mechanism, the detection scheme can be sent to the lower computer, thereby making the control of the lower computer more targeted and accurate. In other examples, it can also be controlled by the lower computer, and the reading mechanism is electrically connected to the lower computer.

[0118] In one embodiment of the present application, the preset speed range is less than or equal to 500 m / s.

[0119] In one example, the preset speed may be 400 m / s, 420 m / s, 450 m / s, 470 m / s, or 500 m / s. The preset speeds in this range may be adapted to the shooting duration of the image acquisition device 10 , thereby achieving flying shooting.

[0120] In one embodiment of the present application, the steps of controlling the image acquisition device 10 to switch between a first position and a second position according to the type of the pole, controlling the first light source or the second light source to be turned on for a preset duration, and simultaneously controlling the image acquisition device 10 to acquire a side image of the pole include:

[0121] Step S31: determining that the pole is a limit pole 200, controlling the image acquisition device 10 to be in a first position, controlling the first light source to be turned on for a preset time, and controlling the image acquisition device 10 to acquire a side image of the pole;

[0122] Step S32: determining that the pole is a minimalist pole 400, controlling the image acquisition device 10 to be in the second position, controlling the second light source to be turned on for a preset time, and controlling the image acquisition device 10 to obtain a side image of the pole.

[0123] Here, in step S31, when the pole is identified as the limit pole 200, the identification result can be sent to the host computer, which then sends the detection solution to the slave computer. The slave computer then controls the drive structure of the image acquisition device 10 to adjust its position, placing the image acquisition device 10 in the first position. When the limit pole 200 is detected in the detection position, because the limit pole 200 primarily detects defects in metal parts, such as metal wire drawing, the first light source is activated to provide detection light that meets the characteristics of regular reflection, thereby improving exposure. The structure at the wire drawing location is dark, and the higher exposure makes the surrounding area appear brighter white. This increases the contrast of the image, makes the defect features more obvious, and improves detection accuracy. The preset duration here can be set based on the shooting duration of the image acquisition device 10 to meet the image quality requirements. In step S32, when the pole is identified as the minimalist pole 400, because the detection range of the minimalist pole 400 is more on plastic parts, the second light source provided in the ring is more suitable for defect detection of the minimalist pole 400, such as scratches, burns, breakage, etc., which can improve the detection accuracy. The brightness channel refers to the second light source having two luminous states with different brightness. Because the two poles of the minimalist pole 400 are different in color, the second light source can provide detection light of two different brightness channels for poles of different colors, thereby ensuring that each pole has a detection light of more appropriate brightness to improve the image acquisition effect and detection accuracy. The setting of the preset time length here can be consistent with the setting of the preset time length described above.

[0124] In one embodiment of the present application, the minimalist pole 400 includes a positive pole and a negative pole, and the pole detection device 100 further includes a light source control component;

[0125] The steps of determining that the pole is a minimalist pole 400, controlling the image acquisition device 10 to be in the second position, controlling the second light source to be turned on for a preset time, and controlling the image acquisition device 10 to acquire a side image of the pole include:

[0126] Step S321: determining that the pole is a minimalist pole 400, controlling the image acquisition device 10 to be in the second position, and detecting the polarity of the minimalist pole 400;

[0127] Step S322: determining that the minimalist pole 400 is a positive pole, sending an instruction to the light source control component to control the second light source to start at a first preset power;

[0128] Step S323: If it is determined that the minimalist pole 400 is a negative pole, an instruction is sent to the light source control component to control the second light source to start at a second preset power; wherein the first preset power is greater than the second preset power.

[0129] In step S321, when it is determined that the pole is the minimalist pole 400, it is possible to further determine through the identification device whether the positive pole enters the detection position first or the negative pole enters the detection position first. The judgment method can be identified by the symbol marks on the sides of the positive pole and the negative pole, or by color, which is not limited here. It can be understood that the color of the positive pole of the minimalist pole 400 is black and is not sensitive to light, so increasing the power of its detection light can provide better brightness and facilitate image acquisition. In step S322, when the positive pole of the minimalist pole 400 reaches the detection position, the second light source is activated by the first preset power, which can enable the second light source to provide detection light in a state with a higher brightness, thereby significantly increasing the background brightness of the positive pole and improving the contrast of its plastic defects. The color of the negative pole is yellow, which normally reflects light. A relatively small power can be selected to activate the second light source, thereby improving detection accuracy and saving energy consumption. Therefore, in step S323, when the negative pole of minimalist pole 400 reaches the detection position, the second light source is activated at the second preset power to meet the background brightness of the negative pole. By adapting the optical brightness of different poles, the flexibility of light source brightness adjustment during photography is improved, the brightness of the side of minimalist pole 400 is increased, the contrast of imaging defects is improved, and the detection rate of defects such as burns, damage, and scratches on the plastic of minimalist pole 400 is improved.

[0130] In one embodiment of the present application, the first preset power is 100w±10w, and the second preset power is 35w±10w.

[0131] The first preset power needs to be relatively high, such as 90W, 95W, 100W, 102W, 105W, 110W, etc., to increase the brightness of the inspection light and improve defect contrast. The second preset power is relatively low, such as 25W, 27W, 30W, 32W, 35W, 40W, 45W, etc., to meet the required brightness without overexposure. Therefore, the second light source within this power range can provide good inspection light for the positive and negative poles respectively, thereby improving their inspection effect.

[0132] In one embodiment of the present application, the step of acquiring and identifying the side image of the pole to obtain defect parameters of the side image includes:

[0133] Step S41: acquiring the side image and segmenting the side image to obtain a defect area;

[0134] Step S42: comparing the defect area according to the defect model to determine defect parameters;

[0135] To more accurately obtain defect parameters, the image is first segmented and the defect features within the image are identified, enabling faster location of the pole's defective area. The defect area can be determined by combining the grayscale values ​​of the image pixels. Further identification of the defect area is performed to determine and extract relevant defect features as defect parameters. This includes identifying the defect using a predefined classification algorithm, confirming the defect type, identifying and confirming the dimensions of the defect area (e.g., length, width, or area), and determining the defect grade based on the grayscale values ​​of the defect area.

[0136] Here, by segmenting the image, it is easier to obtain the defect area and confirm the defect parameters, so that the defects can be accurately judged later and the detection accuracy can be improved.

[0137] In one embodiment of the present application, the step of determining the detection result of the pole based on the defect parameters of the image includes:

[0138] Step S451: comparing the preset defect parameters with the defect parameters of the side image;

[0139] Step S452: If they are consistent, the terminal is determined to be unqualified and the battery 600 containing the terminal is discarded;

[0140] Step S453: If not consistent, determine that the pole is qualified.

[0141] Judging whether the pole is qualified or unqualified according to the preset defect parameters can unify the judgment scale, avoid subjective misjudgment and improve judgment efficiency.

[0142] During the comparison process, in the minimalist pole 400, if the defect type is metal leakage, it is determined whether the length of the leaked metal is greater than a preset length, for example, the preset length is 0.2mm. If it is greater, the pole is determined to be unqualified, and if it is not greater, the pole is determined to be qualified. If the defect type is burn deformation, it is determined whether the deformation is greater than a preset deformation amount, for example, the preset deformation amount is 0.5mm. If it is greater, the pole is determined to be unqualified, and if it is less, the pole is determined to be qualified. In the extreme pole 200, if the defect is metal wire drawing, it is determined whether the width of the metal wire is greater than a preset width and whether the length is greater than a preset length, for example, the preset width is 300μm and the preset length is 800μm. If it meets the above preset range, the pole is determined to be unqualified, and if it is not within the above range, the pole is determined to be qualified. When the pole is determined to be unqualified, the result can be transmitted to an execution mechanism, such as a sorting mechanism, so that the unqualified battery 600 is eliminated to prevent it from flowing into the subsequent process.

[0143] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings under the application concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A pole detection device, wherein: The pole detection device comprises: An image acquisition device, the image acquisition device can be movably arranged and has a first position for detecting an extreme pole and a second position for detecting an extreme pole; A first light source, the first light source is disposed at one side of the image acquisition device, and the first light source is configured to emit a first light toward at least one side of the extreme pole when the image acquisition device is located at the first position; and The second light source is configured to be disposed above the image acquisition device and arranged around the circumference of the minimalist pole. The second light source is configured to emit a second light toward the minimalist pole when the image acquisition device is located at the second position.

2. The pole detection device according to claim 1, wherein: The first light source is a bar-shaped light source, and the limit pole includes four side surfaces connected in sequence; The number of the image acquisition devices is at least two, and at least two of the image acquisition devices are arranged at intervals and are respectively located at the top angle position of the extreme pole. Each of the image acquisition devices correspondingly acquires an image of a side surface of the extreme pole. The projection of the strip light source on the horizontal plane is arranged at an angle to the side surface of the extreme pole, and is configured to provide detection light for at least two of the image acquisition devices.

3. The pole detection device according to claim 2, wherein: There are two strip-shaped light sources, which are respectively located on opposite sides of the limiting pole. There are four image acquisition devices, which are respectively located at two vertex positions of the limiting pole. The outgoing light of each strip-shaped light source is positively reflected into the two image acquisition devices.

4. The pole detection device according to claim 3, wherein: The centers of the two strip-shaped light sources, the central axes of the four image acquisition devices, and the centers of the limiting poles in the vertical direction are on the same horizontal plane.

5. The pole detection device according to any one of claims 2 to 4, wherein: A normal line of the surface of the strip light source and a normal line of a side surface of the extreme pole are arranged at a first angle, and the first angle is 28°±5°; And / or, the end of the strip light source closest to the movement axis of the limit pole is set as the limiting end, and the distance between the limiting end and the movement axis of the limit pole is 60 mm±5 mm.

6. The pole detection device according to any one of claims 1 to 5, wherein: The second light source is a ring-shaped light source, and the second light source has at least two brightness channels. The number of the image acquisition devices is at least two, and at least two of the image acquisition devices are evenly spaced around the minimalist pole. The projection of the central axis of each of the image acquisition devices on the vertical plane is arranged at an angle to the side of the minimalist pole.

7. The pole detection device according to claim 6, wherein: The distance between the surface of the annular light source facing the minimalist pole and the surface of the minimalist pole facing the annular light source is in the range of 45 mm±5 mm.

8. The pole detection device according to claim 6, wherein: The distance between the lens of the image acquisition device and the side of the minimalist pole is in the range of 100 mm ± 10 mm; And / or, a central axis of the image acquisition device forms a second angle with a side surface of the minimalist pole, and the second angle is 15°±5°.

9. A detection method for a pole detection device, wherein: The pole detection device comprises a first light source, a second light source and an image acquisition device, and the detection method comprises: Transport batteries at a preset speed; Controlling and detecting the type of the battery pole; According to the type of the pole, control the image acquisition device to switch between the first position and the second position, then control the first light source or the second light source to turn on for a preset time, and at the same time control the image acquisition device to acquire a side image of the pole; Acquire and identify the side image of the pole, and be configured to obtain defect parameters of the side image; and Based on the defect parameters of the image, a detection result of the pole is determined.

10. The detection method of the pole detection device according to claim 9, wherein: The range of the preset speed is less than or equal to 500m / s.

11. The detection method of the pole detection device according to claim 10, wherein: The step of controlling the image acquisition device to switch between a first position and a second position according to the type of the pole, controlling the first light source or the second light source to be turned on for a preset time, and controlling the image acquisition device to acquire a side image of the pole comprises: Determine that the pole is a limit pole, control the image acquisition device to be in a first position, control the first light source to be turned on for a preset time, and control the image acquisition device to acquire a side image of the pole; Determine that the pole is a minimalist pole, control the image acquisition device to be in a second position, control the second light source to be turned on for a preset time, and control the image acquisition device to obtain a side image of the pole.

12. The detection method of the pole detection device according to claim 11, wherein: The extremely simple pole includes a positive pole and a negative pole, and the pole detection device also includes a light source control component; The steps of determining that the pole is a minimalist pole, controlling the image acquisition device to be in a second position, controlling the second light source to be turned on for a preset time, and controlling the image acquisition device to acquire a side image of the pole include: Determining that the pole is a minimalist pole, controlling the image acquisition device to be in a second position, and detecting the polarity of the minimalist pole; Determining that the minimalist pole is a positive pole, sending a command to the light source control component to control the second light source to start according to the first preset power; and If it is determined that the minimalist pole is a negative pole, an instruction is sent to the light source control component to control the second light source to start according to a second preset power; wherein the first preset power is greater than the second preset power.

13. The detection method of the pole detection device according to claim 12, wherein: The first preset power is 100w±10w, and the second preset power is 35w±10w.

14. The detection method of the pole detection device according to claim 9, wherein: The step of acquiring and identifying the side image of the pole, configured to obtain defect parameters of the side image, comprises: Acquiring the side image and segmenting the side image, configured to acquire a defect area; The defect area is compared according to the defect model and is configured to determine defect parameters, where the defect parameters include at least one of defect type, defect size, and defect grayscale value.

15. The detection method of the pole detection device according to claim 14, wherein: The step of determining the detection result of the pole based on the defect parameters of the image comprises: Comparing the preset defect parameters with the defect parameters of the side image; If the two electrodes are consistent, the electrode is unqualified and the battery containing the electrode is discarded; and If it is determined that there is no inconsistency, the pole is qualified.

Images