Pole detection device and detection method thereof

Abstract

The invention discloses a pole detection device and a detection method thereof, the pole detection device comprises an image acquisition device, a first light source and a second light source, the image acquisition device is movably arranged and has a first position for detecting a limit pole and a second position for detecting an extremely simple pole; the first light source is arranged on one side of the image acquisition device, and the first light source is configured to emit first light towards at least one side surface of the limit pole column when the image acquisition device is located at the first position; the second light source is used for being arranged above the image acquisition device and annularly arranged on the peripheral side of the extremely simple pole, and the second light source is configured to emit a second light ray towards the extremely simple pole when the image acquisition device is located at the second position. According to the technical scheme of the invention, the image acquisition device adjusts the positions of different pole columns, can detect different types of pole columns, simplifies the structure, and saves the space.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and particularly relates to a pole column detection device and a detection method thereof. Background Art

[0002] In the production process of lithium batteries, basic quality inspections need to be carried out on the batteries to improve the product yield. Taking the pole column of the battery as an example, the circumferential side surface needs to be visually inspected, mainly for defects such as plastic burns, scratches, metal leakage due to breakage, and pole column wire drawing. However, the current pole column visual inspection devices can only detect one type of pole column, and their applicability is not high. Summary of the Invention

[0003] The main object of the present invention is to provide a pole column detection device, aiming to improve the applicability of the pole column detection device and save space.

[0004] To achieve the above object, the pole column detection device proposed by the present invention includes:

[0005] An image acquisition device, which is movably arranged and has a first position for detecting the extreme pole column and a second position for detecting the minimalist pole column; and

[0006] A first light source, which is arranged on one side of the image acquisition device and is configured to emit light towards at least one side surface of the pole column and make the light be reflected directly into the image acquisition device; and

[0007] A second light source, which is used to be arranged above the image acquisition device and is arranged around the circumference of the minimalist pole column, and the second light source is configured to emit a second light towards the minimalist pole column when the image acquisition device is in the second position.

[0008] In the above pole column detection device, through the arrangement of the first light source and the second light source at the same station, the image acquisition device is movably arranged, and the position can be adjusted for different pole columns. For example, to acquire an image of the extreme pole column, the first light source is located on one side of the image acquisition device and is used to provide detection light for it to improve the acquisition effect. Here, the image acquisition device can detect different types of pole columns respectively, simplifying the structure and saving space.

[0009] In an embodiment of the present invention, the first light source is a strip light source; the extreme pole column includes four sequentially connected side surfaces;

[0010] The number of the image acquisition devices is at least two. The at least two image acquisition devices are arranged at intervals and are respectively located at the vertex angle positions of the limit pole column. Each image acquisition device correspondingly acquires an image of one side surface of the limit pole column. The projection of the strip light source on the horizontal plane forms an included angle with the side surface of the limit pole column to provide detection light for the at least two image acquisition devices.

[0011] Here, setting the number of the image acquisition devices to be at least two can simultaneously detect at least two side surfaces of the pole column, thereby improving the detection efficiency of the pole column and facilitating the realization of the flying shooting effect. At the same time, the strip light source has a high emission brightness, and the emitted light can be specularly reflected into the image acquisition device, which can further improve the exposure effect, more prominently show defects such as metal wire drawing, scratches or burns, and thus improve the detection accuracy; and the strip light source can match the size of the pole column, reducing the material cost.

[0012] In an embodiment of the present invention, there are two strip light sources. The two strip light sources are respectively located on opposite sides of the limit pole column. The number of the image acquisition devices is four. Two by two, the image acquisition devices are respectively located at the two vertex angle positions of the limit pole column. The emitted light of each strip light source is specularly reflected into the two image acquisition devices.

[0013] Through the setting of two strip light sources and four image acquisition devices, each side surface of the limit pole column can be detected simultaneously, and the flying shooting effect can be further improved.

[0014] In an embodiment of the present invention, the centers of the two strip light sources, the central axes of the four image acquisition devices, and the center of the limit pole column in the vertical direction are on the same horizontal plane.

[0015] The above setting can improve the utilization rate of the strip light source, ensure that most of the light can be specularly reflected into the image acquisition device, and improve the detection effect.

[0016] In an embodiment of the present invention, the normal line on the surface of the strip light source and the normal line of one side surface of the limit pole column form a first included angle, and the first included angle is 28°±5°;

[0017] And / or, it is set that the end of the strip light source closest to the movement axis of the limit pole column is the defined end, and the distance between the defined end and the movement axis of the limit pole column is 60mm±5mm.

[0018] 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 the material cost;

[0019] The position of the strip light source relative to the limit pole column can improve the utilization rate of the light source and ensure the brightness of the detection light.

[0020] In an embodiment of the present invention, the second light source is an annular light source, the second light source has at least two brightness channels, the number of the image acquisition devices is at least two, at least two of the image acquisition devices are evenly spaced on the circumferential side of the minimalist pole column, and the projection of the central axis of each image acquisition device on the vertical plane forms an angle with the side surface of the minimalist pole column.

[0021] The annular light source can provide better detection light for the image acquisition device to ensure that good acquisition images can be obtained on all sides of the pole column; at the same time, at least two image acquisition devices can improve the detection efficiency. Setting at least two brightness channels can provide different brightness detections for different polarities of the minimalist pole column, thereby improving the detection effect and saving energy.

[0022] In an embodiment of the present invention, the distance range between the surface of the annular light source facing the minimalist pole column and the surface of the minimalist pole column facing the annular light source is 45 mm ± 5 mm.

[0023] The above setting of the distance range can ensure the outgoing brightness of the light source and improve the effect of image acquisition.

[0024] In an embodiment of the present invention, the distance range between the lens of the image acquisition device and the side surface of the minimalist pole column is 100 mm ± 10 mm;

[0025] and / or, the central axis of the image acquisition device forms a second angle with the side surface of the minimalist pole column, and the second angle is 15° ± 5°.

[0026] The distance range of the image acquisition device can ensure its image acquisition perspective to expand the detection range of the minimalist pole column;

[0027] The angle range between the central axis of the image acquisition device and the side surface of the minimalist pole column can flexibly adjust the angle on the basis of meeting the imaging light intensity, and then change the field of view according to the measured object.

[0028] The present invention also provides a detection method for a pole column detection device. The pole column detection device includes a first light source, a second light source and an image acquisition device. The detection method includes:

[0029] Transport the battery at a preset speed;

[0030] Control to detect the type of the pole column of the battery;

[0031] According to the type of the pole column, control the image acquisition device to switch between a first position and a second position, then control the first light source or the second light source to be turned on for a preset duration, and at the same time control the image acquisition device to collect the side image of the pole column.

[0032] Obtain and identify the side image of the terminal post to obtain the defect parameters of the side image;

[0033] Determine the detection result of the terminal post based on the defect parameters of the image.

[0034] Here, different light sources are selected according to the type of terminal post to provide detection light, and the image acquisition device is set at a more accurate position, so that the side defect detection of different terminal posts can be carried out targeted, the detection accuracy can be improved, and the judgment efficiency can be improved.

[0035] In an embodiment of the present invention, the range of the preset speed is less than or equal to 500 m / s.

[0036] The preset speed within this range can be adapted to the shooting duration of the image acquisition device, so as to achieve flying shooting.

[0037] In an embodiment of the present invention, the step of controlling the image acquisition device to switch between the first position and the second position according to the type of the terminal post, then controlling the first light source or the second light source to be turned on for a preset duration, and at the same time controlling the image acquisition device to obtain the side image of the terminal post includes:

[0038] Judge that the terminal post is an extreme terminal post, control the image acquisition device to be in the first position, control the first light source to be turned on for a preset duration, and at the same time control the image acquisition device to obtain the side image of the terminal post;

[0039] Judge that the terminal post is a minimalist terminal post, control the image acquisition device to be in the second position, control the second light source to be turned on for a preset duration, and at the same time control the image acquisition device to obtain the side image of the terminal post.

[0040] Here, when it is an extreme terminal post, the first light source is selected for positive reflection to provide detection light, which can improve the exposure, so that the defect features are more obvious and the detection accuracy is improved. When it is a minimalist terminal post, the second light source can provide two different brightness channels for terminal posts of different colors, so as to ensure that each terminal post has more suitable detection light to improve the image acquisition effect.

[0041] In an embodiment of the present invention, the minimalist terminal post includes a positive terminal post and a negative terminal post, and the terminal post detection device further includes a light source control member;

[0042] The step of judging that the terminal post is a minimalist terminal post, controlling the image acquisition device to be in the second position, controlling the second light source to be turned on for a preset duration, and at the same time controlling the image acquisition device to obtain the side image of the terminal post includes:

[0043] Determine that the terminal post is an ultra-minimal terminal post, control the image acquisition device to be in the second position, and detect the polarity of the ultra-minimal terminal post;

[0044] If it is determined that the ultra-minimal terminal post is a positive terminal post, send an instruction to the light source control component to control the second light source to start with a first preset power;

[0045] If it is determined that the ultra-minimal terminal post is a negative terminal post, send an instruction to the light source control component to control the second light source to start with a second preset power; wherein, the first preset power is greater than the second preset power.

[0046] The color of the positive terminal post is black and it is not sensitive to light. Therefore, increasing the power of the detection light can provide better brightness for convenient image acquisition. While the color of the negative terminal post is yellow and it can normally reflect light, a relatively smaller power can be selected to start the second light source to improve the detection accuracy and save energy consumption.

[0047] In an embodiment of the present invention, the first preset power is 100w ± 10w, and the second preset power is 35w ± 10w.

[0048] The light sources within this power range can respectively provide good detection light for the positive and negative terminal posts, thereby improving their detection effects.

[0049] In an embodiment of the present invention, the steps of obtaining and identifying the side image of the terminal post to obtain the defect parameters of the side image include:

[0050] Obtain the side image and segment the side image to obtain the defect area;

[0051] Compare the defect area according to the defect model to determine the defect parameters, and the defect parameters include at least one of the defect type, defect size, and defect gray value.

[0052] Here, by segmenting the image, it is more convenient to obtain the defect area and confirm the defect parameters.

[0053] In an embodiment of the present invention, the steps of determining the detection result of the terminal post based on the defect parameters of the image include:

[0054] Compare the preset defect parameters with the defect parameters of the side image;

[0055] If they are consistent, determine that the terminal post is unqualified and reject the battery where the terminal post is located;

[0056] If they are inconsistent, determine that the terminal post is qualified.

[0057] Judge whether the terminal post is qualified or unqualified according to the preset defect parameters, improving the judgment efficiency. Brief Description of the Drawings

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0059] Figure 1 It is a schematic structural diagram of an embodiment of the terminal post detection device of the present invention;

[0060] Figure 2 For Figure 1 It is a top view of the terminal post detection device shown with the second light source omitted;

[0061] Figure 3 It is a schematic structural diagram of another embodiment of the terminal post detection device of the present invention;

[0062] Figure 4 For Figure 3 It is a front view of the terminal post detection device shown with the first light source omitted;

[0063] Figure 5 It is a flowchart of an embodiment of the detection method of the terminal post detection device of the present invention.

[0064] Explanation of the reference numerals in the drawings:

[0065] Label Name Label Name 100 Terminal post detection device 200 Limit terminal post 10 Image acquisition device 400 Minimal terminal post 30 Linear light source 600 Battery 50 Ring light source

[0066] The realization of the object, functional features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0068] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0069] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In addition, in the present invention, the descriptions involving "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0071] The batteries mentioned in the art can be classified into primary batteries and rechargeable batteries according to whether they are rechargeable. Currently, the common types of rechargeable batteries are: lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries are currently widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively slightly lower, but they have a larger output and charging current, as well as a longer service life, but the cost is higher.

[0072] The batteries described in the embodiments of the present invention refer to rechargeable batteries. Hereinafter, lithium-ion batteries will be mainly used as an example to describe the disclosed embodiments of the present invention. It should be understood that the disclosed embodiments of the present invention are applicable to any other suitable type of rechargeable battery. The batteries mentioned in the disclosed embodiments of the present invention can be directly or indirectly applied to a suitable device to supply power to the device.

[0073] The battery cells disclosed in the embodiments of the present invention can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system of the electrical device can be composed of the battery cells, batteries, etc. disclosed in the present application. Embodiments of the present application provide an electrical device using a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0074] The battery mentioned in the embodiments disclosed in the present invention refers to a single physical module including 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 tab, a negative electrode tab, an electrolyte, and a separator. The lithium-ion battery cell mainly works by the movement of lithium ions between the positive electrode tab and the negative electrode tab. Generally, it can be divided into: cylindrical battery cells, cuboid battery cells, and soft-pack battery cells according to the packaging method. The following will mainly focus on the cuboid 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.

[0075] After the cuboid battery is manufactured, there may be many problems with the housing and the pole of the battery, for example, scratches, grooves, protrusions formed by dirt and impurities, or surface wire drawing, etc. In order to prevent the battery with serious defects on the pole from flowing into the subsequent processes and ensure the production quality and safety performance of the finally prepared battery, it is necessary to perform an appearance inspection on the battery and the pole, and judge whether there are defects according to the collected images.

[0076] The pole mainly includes an extremely simple pole and an extreme pole. The shape of the extremely simple pole is square or circular, and part of its circumference is wrapped with plastic. The extreme pole is a layered structure, with plastic in the lower layer and metal in the upper layer. However, the current pole appearance inspection devices can only detect one of the poles, resulting in low applicability.

[0077] Therefore, in order to solve the problem of low applicability in the related art, the present invention improves the pole detection device. By combining the first light source and the second light source and making the image acquisition device movably arranged, different types of poles can be detected at the same detection position, improving the applicability and saving space.

[0078] Please refer to Figures 1 to 3, in an embodiment of the present invention, the terminal post 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 arranged and has a first position for detecting the extreme terminal post 200 and a second position for detecting the minimalist terminal post 400. The first light source is arranged on one side of the image acquisition device 10 and is configured to emit first light toward at least one side surface of the extreme terminal post when the image acquisition device is at the first position. The second light source is located above the image acquisition device 10 and is arranged around the circumference of the minimalist terminal post 400. The second light source is configured to emit second light toward the minimalist terminal post when the image acquisition device 10 is at the second position.

[0079] The image acquisition device 10 can be a area array camera, a 3D camera, or a 2D camera, which is not limited herein as long as it has the function of image acquisition. The image acquisition device 10 is located on the circumference of the terminal post 200, which means that when the terminal post is at the detection station, the image acquisition device 10 is located on its circumference, mainly for obtaining the side image of the terminal post. The detection station here refers to the position where the terminal post 200 to be detected is placed according to the imaging distance and field of view of the image acquisition device 10. The image acquisition device 10 is movably arranged, that is, the relative position and angle between its lens center and the center of the terminal post can be changed. The number of the image acquisition devices 10 can be multiple and arranged around the circumference of the extreme terminal post 200; it can also be one, which is set to be movable to detect each side of the extreme terminal post 200, which is not limited herein.

[0080] The first light source and the second light source are used to provide detection light for the image acquisition device 10 to improve the acquisition effect. The first light source is a light source for emitting first light when the image acquisition device 10 is at the first position to assist the image acquisition device 10 in acquiring the image of the extreme terminal post and improve the imaging quality of the obtained image. The detection light can be white light. The first light source is arranged on one side of the image acquisition device 10. The first light source can be a backlight source with a plurality of lamp beads arranged in a matrix, a strip light source 30, or a coaxial light source, etc., which is not limited herein, ensuring that the plurality of lamp beads are in the same plane and emit light in the same direction.

[0081] The second light source is located above the detection station, that is, above the minimalist terminal post 400, and is used to assist in the acquisition of the image of the side surface of the minimalist terminal post 400. The minimalist terminal post 400 is a metal structure wrapped with plastic, so the image acquisition device 10 mainly detects the defects on the plastic surface. The cross-section of the minimalist terminal post 400 is generally circular. Therefore, the second light source is arranged around the circumference of the minimalist terminal post 400, so as to be able to provide detection light at each position of the minimalist terminal post 400.

[0082] The second light source is independently arranged from the first light source, but both are located at the same detection station. And through the movable setting of the image acquisition device 10, the first light source and the second light source can share the same set of image acquisition device 10. In this way, the image acquisition device 10 adjusts its position for different pole columns, and by correspondingly using the first light source or the second light source, different types of pole columns can be detected respectively. The two can be combined in space, simplifying the structure and saving the station and space.

[0083] And currently, the detection device for extreme pole columns usually uses a ring light source, and the light emitted by it has diffuse reflection, resulting in the light not being able to accurately enter the image acquisition device. Especially for some defects such as small protrusions or grooves, they cannot be clearly highlighted in the image, thus deteriorating the imaging quality, resulting in inaccurate detection, and seriously affecting the production quality and safety performance of the finally prepared battery.

[0084] In an embodiment of the present invention, the first light source is a strip light source 30, and the extreme pole column 200 includes four sequentially connected side faces; the number of the image acquisition devices 10 is at least two, and at least two of the image acquisition devices 10 are arranged at intervals and are respectively located at the vertex positions of the extreme pole column 200. Each image acquisition device 10 correspondingly acquires an image of one side face of the extreme pole column 200. The projection of the strip light source 30 on the horizontal plane is arranged at an angle with the side face of the extreme pole column 200 to provide detection light for at least two of the image acquisition devices 10.

[0085] The strip light source 30 has a high emission brightness, generally a high-brightness strip light source 30, which is composed of a high-density direct-insert LED array and is suitable for large-format size detection. The irradiation angle can also be freely adjusted. The high-brightness strip light source 30 has high light uniformity, high brightness, good heat dissipation, long service life, high product stability, simple installation, adjustable angle, and is more flexible to apply. Here, the first light source is set as the strip light source 30, providing light based on the principle of regular reflection for the extreme pole column. The image acquisition device 10 can obtain most of the light of the first light source, which can improve the exposure effect and achieve overexposure to enhance the obviousness of defects, that is, make defects such as metal wire drawing or scratches more obvious, thereby improving the detection efficiency and detection accuracy. Here, the light based on the principle of regular reflection means that the emitted light of the first light source is all regularly reflected into the image acquisition device 10. The characteristic of regular reflection is that the incident angle of the light is the same as the reflection angle and is in the same plane, and the intensity of the incident light is equal to the intensity of the reflected light, so as to improve the exposure of the image acquired by the image acquisition device 10. The upper layer of the extreme pole column 200 is metal, and the places with defect positions will show obvious dark colors, thus more highlighting defects such as metal wire drawing, scratches or burns, and improving the detection accuracy.

[0086] It can be understood that the extreme terminal post 200 is generally a square column structure with four side faces. More specifically, its cross-section is rectangular. Here, at least two image acquisition devices 10 are provided, for example, two, three, or four, which can simultaneously detect at least two side faces of the extreme terminal post 200, thereby improving the detection efficiency of the extreme terminal post 200. At the same time, the image acquisition device 10 is located at the vertex position of the extreme terminal post 200, and the projection of the strip light source 30 on the horizontal plane forms an angle with the side face of the extreme terminal post 200. That is, when the top surface of the extreme terminal post 200 faces the vertical direction and the pole detection device 100 projects onto the horizontal plane, both the image acquisition device 10 and the strip light source 30 are arranged at an angle with the side face of the pole, and the emitted light and the received light can form a symmetric structure with the perpendicular bisector of the side face of the extreme terminal post 200 as the symmetry line, which is more conducive to all the light emitted by the strip light source 30 being reflected by the side face of the extreme terminal post 200 and entering the image acquisition device 10 exactly, improving the exposure of the image through the high brightness and further improving the detection accuracy.

[0087] In addition, the length of the strip light source 30 is long enough to cover the image acquisition devices 10 located at two vertices. The emitted light is respectively reflected by two adjacent side faces of the extreme terminal post 200 and enters the two image acquisition devices 10, thereby simplifying the structure and facilitating assembly.

[0088] Please combine Figure 1 and Figure 2 , in an embodiment of the present invention, two strip light sources 30 are provided. The two strip light sources 30 are respectively located on opposite sides of the extreme terminal post 200. The number of image acquisition devices 10 is four. Two image acquisition devices 10 are respectively located at two vertex positions of the extreme terminal post 200. The emitted light of each strip light source 30 is reflected exactly and enters the two image acquisition devices 10.

[0089] In this example, based on one strip light source 30 corresponding to providing detection light for two image acquisition devices 10, two strip light sources 30 and four image acquisition devices 10 are provided. The two strip light sources 30 are respectively located on opposite sides of the extreme terminal post 200, or at two vertices of the extreme terminal post 200. The four image acquisition devices 10 are grouped in pairs and are respectively located at the other two vertices of the extreme terminal post 200. The viewing angle of each image acquisition device 10 is set to be greater than 90 degrees, so that the four side faces of the extreme terminal post 200 can be detected at the same time, realizing comprehensive detection and improving the detection efficiency. In other examples, four strip light sources 30 can also be provided, with one strip light source 30 corresponding to one image acquisition device 10, thus conforming to the position arrangement of exact reflection.

[0090] In one example, when the limit terminal post 200 to be detected is conveyed by a conveying device, according to the conveying speed, when the limit terminal post 200 reaches the detection station, the side images of all its directions can be collected by the image acquisition device 10. Due to the increased exposure, various defects can be better presented, and the time for the limit terminal post 200 to stay at the detection station can be greatly reduced. Thus, when taking images, it can be carried out in the fly shooting mode, that is, when shooting, the conveying device continues to maintain the original conveying speed without stopping, which can reduce the time spent on detection, maximize the coordination with the production rhythm, and improve the production efficiency; it can also avoid frequent starting and stopping of the conveying device, which is beneficial to extending the service life.

[0091] In an embodiment of the present invention, the centers of the two strip light sources 30, the central axes of the four image acquisition devices 10, and the center of the limit terminal post 200 in the vertical direction are on the same horizontal plane.

[0092] In this example, the centers of the strip light source 30, the four image acquisition devices 10, and the limit terminal post 200 in the vertical direction 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 center of the image acquisition device 10 in the vertical direction refers to the axis position where its lens is located. Due to the divergence of light, this structure can make most of the light of the strip light source 30 shine on the side of the limit terminal post 200, and most of the light can be reflected directly into the image acquisition device 10, thereby improving the utilization rate of the strip light source 30 and enhancing the detection effect.

[0093] Please refer to Figure 2 , in an embodiment of the present invention, the normal line on the surface of the strip light source 30 and the normal line on one side of the limit terminal post 200 are set at a first angle α, and the first angle α is 28° ± 5°;

[0094] And / or, set the end of the strip light source 30 closest to the movement axis of the limit terminal post 200 as the limiting end, and the distance D1 between the limiting end and the movement axis of the limit terminal post 200 is 60mm ± 5mm.

[0095] Here, the normal line of the surface of the strip light source 30 refers to the straight line perpendicular to the surface of the strip light source 30 and passing through its center. The normal line of one side of the limit pole 200 refers to the straight line perpendicular to one side of the limit pole 200 and passing through its center. The two normal lines are arranged at an angle, that is, arranged at a first angle α in the same horizontal plane. The first angle can be 28° ± 5°, for example, 23°, 25°, 28°, 30°, or 32°, etc. This angle setting can ensure that the detection light of the two image acquisition devices 10 is taken into account, saving material costs. Here, the angles between the two strip light sources 30 and the side surface of the limit pole 200 can be the same or different, which is not limited here. The angle between the image acquisition device 10 and the side surface of the limit pole 200 can be set according to the above first angle, so that the image acquisition device 10 can receive the light of the strip light source 30 through positive reflection. For example, the angle between the lens axis of one image acquisition device 10 and the normal line of one side surface of the limit pole 200 is 35° ± 5°, and the angle between the lens axis of the other image acquisition device 10 and the normal line of the other side surface of the limit pole 200 is 43° ± 5°. In addition, the angle and position of the image acquisition device 10 can also be finely adjusted according to the imaging requirements, so as to improve the imaging effect.

[0096] On the basis of limiting or not limiting the angle between the strip light source 30 and the side surface of the limit pole 200, it is set that the strip light source 30 has the closest end to the moving axis of the limit pole 200, which is the limiting end. The distance between the limiting end and the moving axis of the limit pole 200 is D1, and the value of D1 is 60mm ± 5mm, for example, 55mm, 57mm, 60mm, 62mm, 63mm, 65mm, 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 to further improve the imaging effect.

[0097] The distance from the lens of the image acquisition device 10 to the center of the side surface of the detected limit pole 200 can be adjusted and set. The distance between the two is D2, and the range of D2 is 100mm ± 10mm, for example, 95mm, 97mm, 100mm, 102mm, 105mm, etc., which can meet the shooting angle and detection accuracy.

[0098] Please refer to Figure 3 and Figure 4 In an embodiment of the present invention, the second light source is an annular light source 50. The second light source has at least two brightness channels. The number of the image acquisition devices 10 is at least two. At least two of the image acquisition devices 10 are evenly spaced on the circumference of the minimalist pole 400. The projection of the central axis of each image acquisition device 10 on the vertical plane forms an angle with the side surface of the minimalist pole 400.

[0099] In this example, the second light source is an annular light source 50, which can uniformly emit detection light towards the circumferential side of the minimalist pole 400, providing more uniform detection light for the image acquisition device 10, so that good acquisition images can be obtained for each side of the minimalist pole 400. In other examples, the second light source can also be at least three strip light sources 30, and the at least three strip light sources 30 are spaced apart and arranged above the minimalist pole 400 in a ring, thereby replacing the function of the annular light source 50. At the same time, there are at least two image acquisition devices 10, and the at least two image acquisition devices are evenly spaced on the circumferential side of the minimalist pole 400, which can be set according to the number of the image acquisition devices 10 and the viewing angle range of each image acquisition device 10, so as to be able to perform side image acquisition of each direction of the minimalist pole 400 at the same time, improving the detection efficiency. For example, there are four image acquisition devices 10, and the viewing angle of each image acquisition device 10 is 90°, so as to cover the entire circumferential side of the minimalist pole 400 and 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 realized without stopping the machine.

[0100] Since the colors of the positive and negative poles of the minimalist pole 400 are different, the requirements for the detection light are also different. Here, it is set that the second light source has at least two brightness channels, that is, has two brightness values, and can be converted by adjusting its voltage or power, so as to provide corresponding brightness for the poles of different polarities, improving the flexibility of the light source brightness adjustment during photographing, enhancing the brightness of the side of the minimalist pole 400, and improving the defect contrast of the imaging, that is, enhancing the detection rate of defects such as plastic burns, breakages, and scratches on the minimalist pole 400.

[0101] In an embodiment of the present invention, the distance range 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 45mm ± 5mm.

[0102] The above distance range setting can ensure the outgoing 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 arranged parallel to the surface of the minimalist pole 400, and the distance between their surfaces is D3, and the value of D3 is 40mm, 42mm, 45mm, 47mm, 50mm, etc.

[0103] Please refer to Figure 4 , in an embodiment of the present invention, the distance between the lens of the image acquisition device 10 and the side of the minimalist pole 400 is D4, and the range of D4 is 100mm ± 10mm;

[0104] And / or, the central axis of the image acquisition device 10 forms a second included angle with the side of the minimalist pole 400, and the second included angle is 15° ± 5°.

[0105] The distance from the lens of the image acquisition device 10 to the center of the side of the detected ultimate terminal 200 can be adjusted and set. The distance between the two is D4, and the range of D4 is 100mm ± 10mm, such as 95mm, 97mm, 100mm, 102mm, 105mm, etc., which can meet the shooting angle of view and detection accuracy.

[0106] On the basis of defining or not defining the distance between the image acquisition device 10 and the side of the minimalist terminal 400, it is set that the central axis forms a second included angle β with the side of the minimalist terminal 400. The range value of β is 15° ± 5°, such as 10°, 12°, 15°, 17° or 20°, etc. On the basis of meeting the imaging light intensity, flexible adjustment of the angle can be realized, and then the field of view can be changed according to the measured object, and the best imaging effect can also be adjusted according to the defect characteristics.

[0107] Please refer to Figure 5 , the present invention also proposes a detection method for the terminal detection device 100. The terminal detection device 100 includes a first light source, a second light source and an image acquisition device. The detection method includes:

[0108] S1: Transport the battery 600 at a preset speed;

[0109] S2: Control to detect the type of the terminal of the battery 600;

[0110] S3: According to the type of the terminal, control the image acquisition device 10 to switch between a first position and a second position, then control the first light source or the second light source to be turned on for a preset duration, and at the same time control the image acquisition device 10 to collect the side image of the terminal;

[0111] S4: Obtain and identify the side image of the terminal to obtain the defect parameters of the side image;

[0112] S5: Based on the defect parameters of the image, determine the detection result of the terminal.

[0113] This detection method can be controlled by a host computer. For example, as the main controller, it acquires the images of the terminal posts collected by the image acquisition device 10, analyzes and processes them, and determines whether the terminal posts are qualified. In step S1, the battery 600 can be conveyed by a conveying device, and the battery 600 is placed on the conveying device through a material taking structure such as a manipulator and reaches the detection station along with the conveying device. The preset speed here is the running speed of the conveying device, which can be set as needed to improve the detection efficiency and achieve the fly-shot effect. The shooting time of the image acquisition device 10 and the exposure times of the first light source and the second light source can be adaptively selected according to this preset speed, so as to achieve the fly-shot effect. In step S2, to control the type of the terminal posts of the battery 600 to be detected, a reading mechanism can be used, such as a radio frequency automatic identification device or a barcode scanner, which is not limited here. The judgment method is to judge according to the template of the terminal posts. For example, the minimalist terminal post 400 is circular or square, and the extreme terminal post 200 is square and has a hierarchical structure up and down. The information of the battery 600 is read through the reading mechanism, so as to obtain the type of the terminal posts of the battery 600, and determine the detection scheme for the terminal posts of the battery 600, improving the detection efficiency. In step S3, after determining the type of the terminal posts, the image acquisition device 10 is controlled to move to the first position or the second position, so as to provide a suitable angle and distance, and when the terminal posts reach the detection station, the first light source or the second light source is controlled to be turned on for a preset duration, and the preset duration can be set according to the shooting duration 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 the fly-shot effect. In other examples, when the terminal posts on the production line are of the same type, this step can be ignored.

[0114] In step S4, the side image of the terminal post can be obtained through a lower computer. For example, a acquisition instruction is sent to the lower computer, and the lower computer sends the image information received from the image acquisition device 10 to the host computer. In other examples, the side image of the terminal post can also be directly obtained from the image acquisition device 10. Since most of the defect types of the minimalist terminal post 400 are plastic defects, and most of the defect types of the extreme terminal post 200 are 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, the defect size, and the defect gray value. In step S5, finally, based on the defect parameters of the image, the influence degree of the defect on the quality of the terminal post is further judged, and the detection result of the terminal post is output. The detection result is divided into qualified and unqualified.

[0115] The detection method is classified according to different types of terminal posts, so as to be more targeted and improve the detection efficiency. Different light sources are selected according to the type of terminal post to provide detection light, and the image acquisition device 10 is set at a more accurate position, so that the side defects of different terminal posts can be detected targeted, thereby improving the detection accuracy and being applicable to different types of terminal posts, improving the applicability.

[0116] It can be understood that the terminal post detection device 100 can execute the steps of the above method under the control of a lower computer, that is, a Programmable Logic Controller (PLC for short). Therefore, the conveying device, the manipulator, the image acquisition device 10 and the light source are all electrically connected to the PLC. Of course, the judgment of the terminal post type can be controlled by the upper computer, and the upper computer is a carrier that bears software capable of sending instructions to the lower computer and reading and processing various data. The reading mechanism is electrically connected to the upper computer. By obtaining the feedback result of the reading mechanism, a detection scheme can be sent to the lower computer, so that the control of the lower computer is 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.

[0117] In an embodiment of the present invention, the range of the preset speed is less than or equal to 500 m / s.

[0118] In one example, the preset speed can be 400 m / s, 420 m / s, 450 m / s, 470 m / s, 500 m / s. The preset speed in this range can be adapted to the shooting duration of the image acquisition device 10, so as to achieve flying shooting.

[0119] In an embodiment of the present invention, the step of controlling the image acquisition device 10 to switch between the first position and the second position according to the type of the terminal post, then controlling the first light source or the second light source to be turned on for a preset duration, and at the same time controlling the image acquisition device 10 to obtain a side image of the terminal post includes:

[0120] Step S31: Determine that the terminal post is an extreme terminal post 200, control the image acquisition device 10 to be in the first position, control the first light source to be turned on for a preset duration, and at the same time control the image acquisition device 10 to obtain a side image of the terminal post;

[0121] Step S32: Determine that the terminal post is a minimalist terminal post 400, control the image acquisition device 10 to be in the second position, control the second light source to be turned on for a preset duration, and at the same time control the image acquisition device 10 to obtain a side image of the terminal post.

[0122] Here, in step S31, when the extreme pole 200 is recognized, the recognition result can be sent to the host computer. The host computer sends a detection scheme to the slave computer, and the slave computer controls the drive structure of the image acquisition device 10 to adjust the position, so that the image acquisition device 10 is in the first position. When it is detected that the extreme pole 200 is in the detection position, since the extreme pole 200 mainly detects defects in the metal part, such as metal wire drawing, etc., the first light source is controlled to start, providing detection light that conforms to the characteristics of regular reflection, so as to improve the exposure. The structure at the wire drawing position is dark, and the higher exposure makes the surrounding area brighter white. In this way, the contrast of the image is higher, the defect characteristics are more obvious, and the detection accuracy is improved. The preset duration here can be set according to the shooting duration of the image acquisition device 10 to meet the image effect. In step S32, when the recognized pole is the minimalist pole 400, since the detection range of the minimalist pole 400 is more in the plastic parts, the second light source arranged in a ring is more suitable for defect detection of the minimalist pole 400, such as scratches, scalds, breakages, etc., which can improve the detection accuracy. The brightness channel means that the second light source has two different brightness emission states. Since the two poles of the minimalist pole 400 have different colors, the second light source can provide detection light of two different brightness channels for different colored poles, so as to ensure that each pole has detection light with a more appropriate brightness, so as to improve the image acquisition effect and detection accuracy. The setting of the preset duration here can be the same as the setting of the above-mentioned preset duration.

[0123] In an embodiment of the present invention, the minimalist pole 400 includes a positive pole and a negative pole, and the pole detection device 100 further includes a light source control member;

[0124] The step of determining that the pole is the minimalist pole 400, controlling the image acquisition device 10 to be in the second position, and controlling the second light source to be turned on for a preset duration, and at the same time controlling the image acquisition device 10 to obtain a side image of the pole, includes:

[0125] Step S321: Determine that the pole is the minimalist pole 400, control the image acquisition device 10 to be in the second position, and detect the polarity of the minimalist pole 400;

[0126] Step S322: If it is determined that the minimalist pole 400 is the positive pole, send an instruction to the light source control member to control the second light source to start with a first preset power;

[0127] Step S323: If it is determined that the minimalist pole 400 is the negative pole, send an instruction to the light source control member to control the second light source to start with a second preset power; wherein, the first preset power is greater than the second preset power.

[0128] In step S321, when it is determined that the terminal post is an ultra - minimalist terminal post 400, it can be further determined by the identification device whether the positive terminal post enters the detection position first or the negative terminal post enters the detection position first. The determination method can be through the identification of symbol marks on the circumferences of the positive terminal post and the negative terminal post, or through color identification, which is not limited here. It can be understood that the color of the positive terminal post of the ultra - minimalist terminal post 400 is black and is not sensitive to light. Therefore, increasing the power of its detection light can provide better brightness for convenient image acquisition. In step S322, when the positive terminal post of the ultra - minimalist terminal post 400 reaches the detection position, the second light source is started with the first preset power, which can enable the second light source to provide detection light in a state with a relatively high brightness. In this way, the background brightness of the positive terminal post is significantly increased, and the contrast of its plastic defects is enhanced. The color of the negative terminal post is yellow and it normally reflects light. A relatively small power can be selected to start the second light source to improve the detection accuracy and save energy consumption. Therefore, in step S323, when the negative terminal post of the ultra - minimalist terminal post 400 reaches the detection position, the second light source is started with the second preset power, which can meet the background brightness of the negative terminal post. By optically adapting the brightness of different terminal posts, the flexibility of adjusting the light source brightness during photographing is improved, the brightness on the side of the ultra - minimalist terminal post 400 is increased, the contrast of the defects in the imaging is enhanced, and the detection rate of defects such as plastic burns, breakages, and scratches on the ultra - minimalist terminal post 400 is also improved.

[0129] In an embodiment of the present invention, the first preset power is 100w ± 10w, and the second preset power is 35w ± 10w.

[0130] The first preset power needs to be relatively large, which can be 90w, 95w, 100w, 102w, 105w, 110w, etc., to increase the brightness of the detection light and improve the defect contrast. The second preset power is relatively small, which can be 25w, 27w, 30w, 32w, 35w, 40w, 45w, etc., to meet the required brightness without over - exposure. Therefore, the second light source within this power range can provide good detection light for the positive terminal post and the negative terminal post respectively, thereby improving its detection effect.

[0131] In an embodiment of the present invention, the step of obtaining and identifying the side image of the terminal post to obtain the defect parameters of the side image includes:

[0132] Step S41: Obtain the side image and segment the side image to obtain the defect area;

[0133] Step S42: Compare the defect area according to the defect model to determine the defect parameters;

[0134] In order to more accurately obtain the defect parameters, the image is first segmented to identify the defect features in the image, so as to more quickly locate the defect area of the terminal post. The defect area can be determined by combining the gray values of the image pixels. Further identification is performed on the defect area to determine and extract the relevant features of the defect as defect parameters, including identifying the defect through a set classification algorithm, confirming the defect type of the defect area, and identifying and confirming the size of the defect area, such as length, width or area, etc., and identifying the gray value of the defect area to determine the defect level, etc.

[0135] Here, by segmenting the image, it is more convenient to obtain the defect area and confirm the defect parameters, so as to accurately judge the defect subsequently and improve the detection accuracy.

[0136] In an embodiment of the present invention, the step of determining the detection result of the terminal post based on the defect parameters of the image includes:

[0137] Step S451: Compare the preset defect parameters with the defect parameters of the side image;

[0138] Step S452: If they are consistent, determine that the terminal post is unqualified and remove the battery 600 where the terminal post is located;

[0139] Step S453: If they are inconsistent, determine that the terminal post is qualified.

[0140] Judging whether the terminal post is qualified or unqualified according to the preset defect parameters can make the judgment scale unified, avoid subjective misjudgment and improve the judgment efficiency.

[0141] During the comparison process, in the minimalist terminal post 400, if the defect type is metal leakage, judge whether the length of the metal leakage is greater than the preset length. For example, the preset length is 0.2 mm. If it is greater, determine that the terminal post is unqualified. If it is not greater, determine that the terminal post is qualified. If the defect type is scald deformation, judge whether the deformation is greater than the preset deformation amount. For example, the preset deformation amount is 0.5 mm. If it is greater, determine that the terminal post is unqualified. If it is less, determine that the terminal post is qualified. In the extreme terminal post 200, if the defect is metal wire drawing, judge whether the width of the metal wire is greater than the preset width and the length is greater than the preset length. For example, the preset width is 300 μm and the preset length is 800 μm. If it meets the above preset range, determine that the terminal post is unqualified. If it is not within the above range, determine that the terminal post is qualified. When it is determined that the terminal post is unqualified, the result can be transmitted to the actuator, such as the sorting mechanism, so as to remove the unqualified battery 600 and prevent it from flowing into the subsequent process.

[0142] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A pole detection device, characterized in that, the pole detection device includes: an image acquisition device, which is movably arranged and has a first position for detecting an extreme pole and a second position for detecting a minimalist pole; a first light source, which is arranged on one side of the image acquisition device, and the first light source is configured to emit first light towards at least one side surface of the extreme pole when the image acquisition device is in the first position; and a second light source, which is used to be arranged above the image acquisition device and is arranged around the circumference of the minimalist pole, and the second light source is configured to emit second light towards the minimalist pole when the image acquisition device is in the second position.

2. The pole detection device according to claim 1, characterized in that, the first light source is a strip light source, and the extreme pole includes four sequentially connected side surfaces; the number of the image acquisition devices is at least two, at least two of the image acquisition devices are arranged at intervals and are respectively located at the vertex positions of the extreme pole, each of the image acquisition devices correspondingly acquires an image of one side surface of the extreme pole, and the projection of the strip light source on the horizontal plane is arranged at an angle with the side surface of the extreme pole to provide detection light for at least two of the image acquisition devices.

3. The pole detection device according to claim 2, characterized in that, there are two strip light sources, and the two strip light sources are respectively located on opposite sides of the extreme pole, the number of the image acquisition devices is four, and two of the image acquisition devices are respectively located at the two vertex positions of the extreme pole, and the emitted light of each strip light source is reflected directly into two of the image acquisition devices.

4. The pole detection device according to claim 3, characterized in that, the centers of the two strip light sources, the central axes of the four image acquisition devices, and the center of the extreme pole in the vertical direction are on the same horizontal plane.

5. The pole detection device according to any one of claims 2 to 4, characterized in that, a first angle is set between the normal of the surface of the strip light source and the normal of one side surface of the extreme pole, and the first angle is 28° ± 5°; and / or, setting the end closest to the movement axis of the extreme pole of the strip light source as the limiting end, and the distance between the limiting end and the movement axis of the extreme pole is 60mm ± 5mm.

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

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

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

9. A detection method of a pole detection device It is characterized in that the pole detection device includes a first light source, a second light source and an image acquisition device, and the detection method includes: transporting the battery at a preset speed; controlling to detect the type of the pole of the battery; 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 duration, and at the same time controlling the image acquisition device to acquire a side image of the pole; acquiring and identifying the side image of the pole to obtain defect parameters of the side image; determining the detection result of the pole based on the defect parameters of the image.

10. The detection method of the pole detection device according to claim 9 It is characterized in that 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 It is characterized in that the step of, 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 duration, and at the same time controlling the image acquisition device to acquire the side image of the pole, includes: judging that the pole is an extreme pole, controlling the image acquisition device to be in the first position, and controlling the first light source to be turned on for a preset duration, and at the same time controlling the image acquisition device to acquire the side image of the pole; judging that the pole is a minimalist pole, controlling the image acquisition device to be in the second position, and controlling the second light source to be turned on for a preset duration, and at the same time controlling the image acquisition device to acquire the side image of the pole.

12. The detection method of the pole detection device according to claim 11 It is characterized in that the minimalist pole includes a positive pole and a negative pole, and the pole detection device further includes a light source control member; the step of, judging that the pole is a minimalist pole, controlling the image acquisition device to be in the second position, and controlling the second light source to be turned on for a preset duration, and at the same time controlling the image acquisition device to acquire the side image of the pole, includes: judging that the pole is a minimalist pole, controlling the image acquisition device to be in the second position, and detecting the polarity of the minimalist pole; judging that the minimalist pole is a positive pole, then sending an instruction to the light source control member to control the second light source to start with a first preset power; judging that the minimalist pole is a negative pole, then sending an instruction to the light source control member to control the second light source to start with 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 It is characterized in that the first preset power is 100w ± 10w, and the second preset power is 35w ± 10w.

14. The detection method of the terminal post detection device according to claim 9, characterized in that, the step of obtaining and identifying the side image of the terminal post to obtain the defect parameters of the side image includes: obtaining the side image and segmenting the side image to obtain a defect area; comparing the defect area with a defect model to determine defect parameters, where the defect parameters include at least one of a defect type, a defect size, and a defect gray value.

15. The detection method of the terminal post detection device according to claim 14, characterized in that, the step of determining the detection result of the terminal post based on the defect parameters of the image includes: comparing the preset defect parameters with the defect parameters of the side image; if they are consistent, determining that the terminal post is unqualified and removing the battery where the terminal post is located; if they are inconsistent, determining that the terminal post is qualified.

Images