Pole piece detection method and system

Abstract

The invention discloses a pole piece detection method and system. The method comprises the following steps: acquiring a to-be-detected image acquired from a pole piece; according to preset edge grabbing area information, at least one edge grabbing area is determined in the to-be-detected image, and the preset edge grabbing area information comprises position information and / or size information of the edge grabbing area; boundary detection is carried out on all the edge grabbing areas, first boundary lines in all the edge grabbing areas are obtained, and the first boundary lines are used for dividing different partitions arranged in the width direction of the pole pieces; and determining width information related to the pole piece by utilizing the first boundary line in each edge grabbing area. In this way, the pole piece can be automatically detected.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole piece detection method and system. Background Art

[0002] The pole piece of a lithium battery is composed of two parts: a substrate and a coating. The substrate is copper foil or aluminum foil, and the coating is an active material. The pole piece is made by coating the active material on the substrate and then drying, compacting and cutting. Among them, when there are abnormalities in the manufactured pole piece, such as metal leakage, bubbles, pinholes, etc. in the coating area of ​​the pole piece surface, and the size of the coating area of ​​the pole piece does not meet the requirements, etc., it will cause the prepared battery capacity consistency to be poor, safety to be poor, and self-discharge to be high, which seriously affects the quality of the battery. Therefore, the detection of pole pieces is an urgent problem to be solved. Summary of the invention

[0003] The present application at least provides a pole piece detection method and system.

[0004] In a first aspect, the present application provides a method for detecting a pole piece, the method comprising: obtaining an image to be detected obtained by capturing the pole piece; determining at least one edge-grabbing area in the image to be detected according to preset edge-grabbing area information, wherein the preset edge-grabbing area information comprises position information and / or size information of the edge-grabbing area; performing boundary detection on each edge-grabbing area to obtain a first boundary line in each edge-grabbing area, wherein the first boundary line is used to divide the pole piece into different partitions arranged in the width direction; and determining width information related to the pole piece using the first boundary line in each edge-grabbing area.

[0005] Therefore, at least one edge grabbing area is determined in the image to be detected according to the preset edge grabbing area information, and the boundary detection is performed on each edge grabbing area to obtain the first boundary line in each edge grabbing area, and the width information related to the electrode piece is determined using the first boundary line in each edge grabbing area. Therefore, automatic detection of the electrode piece can be achieved.

[0006] Furthermore, the above scheme can also use the preset edge grabbing area to determine the width information related to the pole piece, thereby realizing automatic detection of the width information related to the pole piece; in addition, the preset edge grabbing area does not require user setting, thereby improving the detection efficiency of the width information related to the pole piece.

[0007] Wherein, according to the preset edge grabbing area information, at least one edge grabbing area is determined in the image to be detected, including: when the electrode piece is an anode electrode piece, at least four edge grabbing areas are determined in the image to be detected according to the preset edge grabbing area information, or, when the electrode piece is a cathode electrode piece, at least six edge grabbing areas are determined in the image to be detected according to the preset edge grabbing area information. Wherein, the boundary detection of each edge grabbing area is performed by multiple threads, and the boundary detection of each edge grabbing area is performed by using one of the threads.

[0008] Therefore, the boundary detection of each edge-grabbing area is performed in multiple threads, that is, a plurality of first boundary lines in the image to be detected are captured simultaneously, so as to speed up the operation speed and reduce the processing time of a single image to be detected.

[0009] Among them, before determining at least one edge grabbing area in the image to be detected according to the preset edge grabbing area information, the pole piece detection method also includes: obtaining a sample image obtained by collecting a pole piece; capturing a plurality of second boundary lines in the sample image; using each second boundary line, obtaining the information of the edge grabbing area corresponding to each second boundary line, so as to obtain the preset edge grabbing area information.

[0010] Therefore, the preset edge-grabbing area information can be automatically determined and generated, and the efficiency of determining and generating the preset edge-grabbing area information is higher.

[0011] Among them, capturing several second boundary lines in the sample image includes: determining the boundary detection area of ​​the sample image according to the area setting information; capturing several second boundary lines from the boundary detection area; and / or, using each second boundary line, obtaining information of the edge grabbing area corresponding to each second boundary line, so as to obtain preset edge grabbing area information, including at least one of the following steps: for each second boundary line, obtaining position information of a first preset position point of the second boundary line as the position information of a second preset position point in the edge grabbing area corresponding to the second boundary line; obtaining size information of the edge grabbing area corresponding to the second boundary line.

[0012] Therefore, the second boundary line in the boundary detection area can be flexibly determined according to the area setting information; and / or the size information of the edge grabbing area can be flexibly adjusted.

[0013] Among them, boundary detection is performed on each edge grabbing area to obtain the first boundary line in each edge grabbing area, including: for each edge grabbing area, using the grayscale change in the edge grabbing area to find out a number of boundary points, and the grayscale change between the boundary points and adjacent pixel points meets the boundary grayscale change requirement; using a number of boundary points in the edge grabbing area to perform straight line fitting to obtain the first boundary line in the edge grabbing area.

[0014] Therefore, the grayscale change between the pixel point and its adjacent pixel points meets the boundary grayscale change requirements, indicating that the grayscale difference between the pixel point and its adjacent pixel points is significant, and the partition where the pixel point is located is different from the partition where the adjacent pixel point is located. The pixel point is determined to be the boundary point of the two partitions in the edge grabbing area.

[0015] Among them, the first boundary line in each edge-grabbing area is used to determine the width information related to the pole piece, including: determining the partitions divided by each first boundary line; obtaining the distance between the two first boundary lines corresponding to each target partition as the width information of each target partition, wherein the target partition is any partition on the pole piece, or a plurality of consecutive adjacent partitions spliced ​​together.

[0016] Therefore, the target partition is located between the two boundary lines corresponding to the target partition, and therefore, the distance between the two first boundary lines corresponding to the target partition is the width of the target partition.

[0017] Wherein, determining the partitions that each first boundary line is used to divide includes: determining the partitions that each first boundary line is used to divide according to the grayscale information on both sides of each first boundary line; extracting the boundary line partition information of each edge grabbing area from the preset edge grabbing area information, the boundary line partition information includes the partition identifier, partition name or partition sorting information of the partition that the first boundary line in the edge grabbing area is used to divide, the partition sorting information indicates the sorting of the partition that the first boundary line is used to divide among the multiple partitions in the width direction of the pole piece; and, using the boundary line partition information of each edge grabbing area, determining the partition that the first boundary line in each edge grabbing area is used to divide.

[0018] Therefore, since there will be partitions of the same type in the pole piece, the partition divided by the first boundary line can be determined according to the grayscale information on both sides of the first boundary line, but it is impossible to determine whether the same type of partitions divided by other first boundary lines are the same partition as the partition used to divide itself. Through the boundary line partition information, the relevant information of the partitions divided by the first boundary line in each edge grabbing area can be determined, so that the two boundary lines corresponding to each partition can be determined.

[0019] Among them, the width information includes coating-related width information that can characterize the position and / or width of the coating area of ​​the two coating surfaces of the electrode; after using the first boundary line in each edge grabbing area to determine the width information related to the electrode, the electrode detection method also includes: using the coating-related width information to determine the coating misalignment information, the coating misalignment information characterizes the misalignment of the coating area; based on the coating misalignment information, using a correction mechanism to correct the coating mechanism of the two coating surfaces and at least one of the electrode pieces, so that after the correction, the coating areas of the two coating surfaces are aligned and / or are both located at the standard coating positions in the coating surface.

[0020] Therefore, according to the misalignment of the coating area on the coating surface of the pole piece, the deviation correction will be carried out in time, so that the coating areas of the two coating surfaces of the pole piece are aligned and both are located at the standard coating position on the coating surface, so as to ensure the quality of the pole piece, thereby ensuring the capacity consistency, safety and reliability of the battery cell manufactured based on the pole piece in the future. In addition, the misalignment of the coating areas of the two coating surfaces of the pole piece is automatically determined based on the coating image, and the deviation correction based on the misalignment of the coating areas of the two coating surfaces is also automatically carried out, and no manual operation is required. That is, the misalignment of the coating area on the coating surface can be determined in time and accurately, and the deviation correction can be carried out in time and accurately based on the misalignment of the coating areas of the two coating surfaces, which has a fast response to the deviation correction of the pole piece coating, high efficiency, high deviation correction accuracy, and reduces the burden on the staff.

[0021] Among them, the pole piece detection method also includes: determining a quality detection area in the image to be detected, the quality detection area includes one or more partitions in the width direction of the pole piece; performing quality detection on the quality detection area to obtain a quality detection result of the quality detection area.

[0022] Therefore, the quality of the pole piece can be automatically detected to timely determine whether there is any abnormality in the pole piece, thereby avoiding subsequent batch scrapping of the pole pieces.

[0023] Among them, the grayscale value of each partition of the pole piece in the collected image belongs to a different grayscale interval; determining the quality detection area in the image to be detected, including: finding the first pixel point whose grayscale value belongs to the target grayscale interval from the image to be detected; obtaining the connected domain formed by the first pixel point as the quality detection area; and / or performing quality detection on the quality detection area to obtain the quality detection result of the quality detection area, including: using the grayscale distribution in the quality detection area to determine whether there are defects in the quality detection area.

[0024] Therefore, since the grayscale values ​​of different types of partitions of the electrode (such as coated partitions, uncoated partitions, ceramic partitions, etc.) in the collected image are different, the grayscale values ​​of the same type of partitions in the collected image are basically the same, or in other words, the grayscale values ​​of the same type of partitions in the collected image will belong to their corresponding grayscale intervals, and the grayscale intervals corresponding to different partitions are different. Therefore, the areas belonging to various partitions in the image to be detected can be determined by the grayscale values ​​of the pixels in the image to be detected, thereby determining the required quality detection area.

[0025] Wherein, the quality inspection area includes a ceramic partition and a coating partition, and the defect includes metal leakage in the ceramic partition or the coating partition; and / or, using the grayscale distribution in the quality inspection area, determining whether there is a defect in the quality inspection area, including: finding a number of second pixel points whose grayscale values ​​do not belong to the target grayscale range from the quality inspection area; using the number of second pixel points, determining at least one suspected defective area; in response to the suspected defective area meeting a preset size requirement, determining that the suspected defective area has a defect, the preset size requirement including at least one of the area meeting a preset area condition and the width meeting a preset width condition.

[0026] Therefore, by performing quality inspection on the ceramic partition and coating partition of the electrode, it is determined whether there is metal leakage in the ceramic partition and the coating partition, and whether there are defects in the electrode during the coating process, so as to avoid subsequent coating batch scrapping; and / or, when the suspected defective area meets the preset size requirements, the suspected defective area is regarded as the defective area existing in the quality inspection area, instead of treating all determined suspected defective areas as defective areas existing in the quality inspection area, thereby improving the accuracy of quality inspection.

[0027] Wherein, obtaining the image to be detected obtained by capturing the pole piece includes: obtaining at least two initial images captured by at least two image capture devices corresponding to the same capture time of the pole piece, and the multiple image capture devices are arranged along the width direction of the pole piece; determining the overlapping area in the at least two initial images; removing the overlapping area of ​​the at least two initial images, and splicing the at least two initial images after removal to obtain the image to be detected; and / or, before determining at least one edge grabbing area in the image to be detected according to preset edge grabbing area information, the pole piece detection method also includes: in response to the image to be detected being an abnormal image, discarding the image to be detected; and / or, the image to be detected is obtained by splicing at least two initial images captured by at least two image capture devices corresponding to the same capture time, and before obtaining the image to be detected captured by the pole piece, the pole piece detection method also includes: in response to the existence of abnormal images in the at least two initial images, discarding the at least two initial images.

[0028] Therefore, by splicing the initial images captured by at least two image acquisition devices to generate the image to be detected, the shooting field of view of the image acquisition device is enlarged, which can be suitable for image acquisition of wide-width pole pieces; and / or, abnormal images to be detected are not detected, thereby reducing resource consumption; and / or, the image to be detected is generated without splicing abnormal initial images, thereby reducing resource consumption.

[0029] A second aspect of the present application provides a visual inspection system, which includes at least one image acquisition device, a processing device and a host computer; at least one image acquisition device is used to acquire images of a pole piece; the processing device is communicatively connected to the at least one image acquisition device, and is used to detect the pole piece using the image acquired by the at least one image acquisition device to obtain a detection result of the pole piece, wherein the detection result includes width information related to the pole piece, and the width information is determined using a first boundary line detected in at least one edge grabbing area of ​​the image; the host computer is communicatively connected to the processing device, and is used to display the image acquired by the image acquisition device, and / or to prompt the detection result.

[0030] Therefore, the processing device can be used to detect the pole piece using the image acquired by at least one image acquisition device, that is, the processing device of the visual inspection system can realize automatic detection of the pole piece.

[0031] Furthermore, the above scheme may also be provided with a monitoring device, which can be used to display the images collected by the image acquisition device so that relevant personnel can promptly learn about the coating conditions of the electrode, etc.; or, the monitoring device can be used to prompt the detection results so that relevant personnel can promptly learn about the detection conditions of the electrode, so that when the electrode detection is abnormal, corresponding processing can be carried out in time to prevent the coating batch from being scrapped. Therefore, the visual inspection system can also integrate the electrode detection function with the related information display function, which can realize both automatic detection of the electrode and image display and / or detection result prompting.

[0032] Wherein, the image acquisition device is a first type of acquisition device, and the system also includes a light source for providing shooting light for the first type of acquisition device, the light source and the first type of acquisition device are respectively located on both sides of the target normal, and the target normal is the normal of the tangent between the pole piece and the roller used to transport the pole piece; wherein, there is a first distance between the intersection between the optical axis of the first type of acquisition device and the acquisition surface and the target tangent point, the acquisition surface is the side of the pole piece facing the first type of acquisition device, and the target tangent point is the tangent point between the pole piece and the roller used to transport the pole piece, and the first distance can make the incident amount of the reflected light of the roller on the light source incident on the first type of acquisition device lower than a preset threshold; and / or, the second distance between the first type of acquisition device and the acquisition surface is related to the focal length of the first type of acquisition device; and / or, there is a first angle between the irradiated light of the light source and the target normal, and there is a second angle between the optical axis of the first type of acquisition device and the target normal, and the size of at least one of the first angle and the second angle can make the illumination intensity of the shooting area of ​​the first type of acquisition device meet the requirements; and / or, there is a third distance between the light source and the acquisition surface.

[0033] Therefore, by setting the intersection point between the optical axis of the first type of acquisition device and the acquisition surface and the target tangent point according to the first distance, the incident amount of the reflected light of the roller on the light source to the first type of acquisition device can be lower than a preset threshold, thereby improving the quality of the image collected on the acquisition surface; and / or, setting the second distance between the first type of acquisition device and the acquisition surface is related to the focal length of the first type of acquisition device, so that the first type of acquisition device and the acquisition surface are in a suitable position, so that the first type of acquisition device can capture an image with bright picture, uniform image quality and no distortion; and / or, by setting the irradiation light of the light source to form a first angle with the target normal and the optical axis of the first type of acquisition device to form a second angle with the target normal, the light intensity of the light source on the collection surface can be the strongest and the power consumption can be the least.

[0034] Among them, the image acquisition device is a second-type acquisition device, the second-type acquisition device is connected to multiple acquisition cards corresponding to the second-type acquisition device, and the multiple acquisition cards corresponding to the second-type acquisition device are connected to the processing device; wherein, the multiple acquisition cards corresponding to the second-type acquisition device are connected to each other through an inter-board synchronization line, the system's encoder transmits an acquisition trigger signal to one of the acquisition cards, and one of the acquisition cards is synchronized with the remaining acquisition cards corresponding to the second-type acquisition device through the inter-board synchronization line to trigger the second-type acquisition device to perform image acquisition.

[0035] Therefore, the second type of acquisition device can be triggered to perform image acquisition through the acquisition card, and the triggering control of the second type of acquisition device is more flexible and convenient.

[0036] Among them, the image acquisition device is a second type of acquisition device, the second type of acquisition device is connected to multiple acquisition cards corresponding to the second type of acquisition device, and the multiple acquisition cards corresponding to the second type of acquisition device are connected to the processing device; wherein, the system also includes a signal distributor connected to the encoder, and the acquisition trigger signal emitted by the encoder outputs multiple acquisition trigger signals through the signal distributor to be transmitted to each acquisition card respectively, so as to trigger the second type of acquisition device to perform image acquisition.

[0037] Therefore, the acquisition cards of multiple second-type acquisition devices can be triggered simultaneously through the signal distributor connected to the encoder.

[0038] Among them, the second type of acquisition device is a macro camera; and / or, there is a third distance between the second type of acquisition device and the acquisition surface, and the acquisition surface is a side of the pole piece facing the first type of acquisition device.

[0039] Therefore, the macro camera can capture high-resolution images at high speed in a wide range, and can capture images at close range, saving space; and / or, can flexibly set the distance between the second type of acquisition device and the acquisition surface.

[0040] Among them, at least one image acquisition device includes at least one device group, each device group includes at least one image acquisition device, and different device groups are used to acquire images on different surfaces of the pole piece.

[0041] Therefore, by setting up multiple groups of devices, images of different surfaces of the electrode piece can be collected simultaneously, so that relevant conditions such as coating on the front and back surfaces of the electrode piece can be obtained in time.

[0042] Among them, at least one device group includes a first device group and a second device group, and the processing device includes a main processing device and a slave processing device; the main processing device is connected to the first device group, and is used to detect the image collected by the first device group to obtain a first detection result; the slave processing device is connected to the second device group, and is used to detect the image collected by the second device group to obtain a second detection result, and send at least one of the image collected by the second device group and the second detection result to the main processing device; the main processing device is connected to the monitoring device, and is also used to send the images collected by the first device group and the second device group to the monitoring device, and / or prompt the first detection result and the second detection result.

[0043] Therefore, when the visual inspection system includes two device groups, one processing device cannot support the normal operation of the two device groups at the same time, so a master-slave processing device is set up, and the master-slave processing device is connected to a device group respectively to ensure its normal operation.

[0044] Among them, the image acquisition device is a first type of acquisition device, and the system also includes two light source modules, each light source module includes a light source and a light source controller connected to each other, and the light source controllers of the two light source modules are respectively connected to the main processing device and the slave processing device, so that the corresponding connected processing device instructs the light source controller to control the corresponding light source to work; and / or, the main processing device and the slave processing device are connected through a network.

[0045] Therefore, the illumination parameters of the light source can be flexibly controlled by the processing device; and / or, the network connection between the main processing device and the slave processing device can be connected for long-distance communication and is less affected by the setting location area.

[0046] Among them, the host computer includes at least one, and at least one host computer is arranged at a preset position of the coating system for coating the electrode.

[0047] Therefore, the number of monitoring devices and the specific locations of the monitoring devices can be flexibly set.

[0048] The third aspect of the present application provides a coating system, which includes an unwinding mechanism for unwinding an electrode; a first coating mechanism for coating a first coating surface of the unwinding electrode; a second coating mechanism, which is arranged behind the first coating mechanism, for coating a second coating surface of the electrode; a drying mechanism for drying the electrode after being coated by the first coating mechanism and the second coating mechanism; a winding mechanism for winding up the dried electrode; a visual inspection system, the visual inspection system including at least one image acquisition device and a processing device, the image acquisition device being used to acquire an image of the electrode to obtain an image to be detected; the processing device being used to determine at least one edge grabbing area in the image to be detected according to preset edge grabbing area information, the preset edge grabbing area information including position information and / or size information of the edge grabbing area; performing boundary detection on each edge grabbing area to obtain a first boundary line in each edge grabbing area, the first boundary line being used to divide different partitions of the arrangement of the electrode in the width direction; and determining width information related to the electrode using the first boundary line in each edge grabbing area.

[0049] Among them, the visual inspection system also includes a first image acquisition device and a second image acquisition device, the first image acquisition device and the second image acquisition device are arranged behind the second coating mechanism, and the first image acquisition device is arranged on one side of the first coating surface, and the second image acquisition device is arranged on one side of the second coating surface.

[0050] The visual inspection system further includes a deviation correction mechanism, which is used to correct the deviation of the coating surface of the electrode.

[0051] The above technical solution determines at least one edge grabbing area in the image to be detected according to the preset edge grabbing area information, performs boundary detection on each edge grabbing area to obtain the first boundary line in each edge grabbing area, and uses the first boundary line in each edge grabbing area to determine the width information related to the electrode piece. Therefore, automatic detection of the electrode piece can be achieved.

[0052] Furthermore, the above scheme can also use the preset edge grabbing area to determine the width information related to the pole piece, thereby realizing automatic detection of the width information related to the pole piece; in addition, the preset edge grabbing area does not require user setting, thereby improving the detection efficiency of the width information related to the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a flow chart of an embodiment of a pole piece detection method provided by the present application;

[0054] Figure 2 is a schematic diagram of an embodiment of an image to be detected provided by the present application;

[0055] Figure 3 is a schematic diagram of another embodiment of the image to be detected provided by the present application;

[0056] Figure 4 It is a schematic diagram of the layout of the image acquisition device provided by this application;

[0057] Figure 5 It is a schematic diagram of the arrangement of two image acquisition devices provided by the present application;

[0058] Figure 6 It is a structural schematic diagram of an embodiment of a coating system provided by the present application;

[0059] Figure 7 is a schematic diagram of an embodiment of the edge gripping area provided by the present application;

[0060] Figure 8 It is a flow chart of another embodiment of the pole piece detection method provided by the present application;

[0061] Fig. 9 It is a flow chart of another embodiment of the pole piece detection method provided by the present application;

[0062] Fig.10 yes Fig. 9 The flowchart of step S91 is shown as an embodiment;

[0063] Fig.11 It is a flow chart of an embodiment of determining whether a quality inspection area has defects by using the grayscale distribution of the quality inspection area provided by the present application;

[0064] Fig.12 yes Figure 1 The flowchart of step S11 is shown as an embodiment;

[0065] Fig.13 This is a flow chart of an embodiment of generating preset edge grabbing area information provided by the present application;

[0066] Fig.14 is a schematic diagram of an embodiment of a boundary detection area provided by the present application;

[0067] Fig.15 yes Figure 1 The flowchart of step S13 is shown as an embodiment;

[0068] Fig.16 is a schematic diagram of an embodiment of a caliper tool provided by the present application;

[0069] Fig.17 yes Figure 1 The flowchart of step S14 is shown as an embodiment;

[0070] Fig.18 yes Fig.17 The flowchart of step S171 of an embodiment is shown;

[0071] Fig.19 It is a schematic diagram of the electrical topology structure of an embodiment of a visual inspection system provided by the present application;

[0072] Fig. 20 A schematic diagram of the electrical topology structure of another embodiment of the visual inspection system provided by the present application;

[0073] Fig.21 It is a schematic diagram of an embodiment of a shooting point of an image acquisition device provided by the present application;

[0074] Fig. 22 It is a schematic diagram of the installation of an embodiment of the image acquisition device provided by the present application;

[0075] Fig.23 is a schematic diagram of an embodiment of electrical wiring of a macro camera provided by the present application;

[0076] Fig.24 It is a schematic diagram of an embodiment of macro camera imaging provided by the present application. DETAILED DESCRIPTION

[0077] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0078] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0079] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, can mean including any one or more elements selected from the set consisting of A, B, and C.

[0080] See also Figure 1 , Figure 1 It is a flow chart of an embodiment of the electrode detection method provided by the present application. It should be noted that if there are substantially the same results, the embodiments of the present application are not limited to the above embodiments. Figure 1 The process sequence shown is limited. Figure 1 As shown, this embodiment includes:

[0081] Step S11: Acquire the image to be detected acquired by collecting the electrode piece.

[0082] The method of this embodiment is used to automatically detect width information related to the pole piece, improve the detection accuracy and efficiency of the width information related to the pole piece, and greatly reduce the width measurement error, thereby ensuring the subsequent laser cutting of pole pieces with a width that meets the process requirements based on the detected width information, preventing the cutter from cutting off-center, and further ensuring the safety and capacity consistency of batteries made based on pole pieces with a width that meets the process requirements.

[0083] In this embodiment, the image to be detected obtained by collecting the electrode piece is obtained. When the electrode piece is an aluminum foil current collector, the positive electrode material (such as LEP, NCM, etc.) is coated on the aluminum foil current collector, and when the electrode piece is a copper foil current collector, the negative electrode material (such as graphite, LTO, etc.) is coated on the copper foil current collector; copper foil, as the negative electrode current collector of the battery, acts as a carrier of the negative electrode active material, and also acts as a negative electrode electron collector and conduction, and its function is to collect the current generated by the battery active material to generate a larger output current; aluminum foil, as the positive electrode current collector of the battery, acts as a carrier of the positive electrode active material. The battery using the aluminum foil current collector has a strong charge and discharge capacity, is not easily corroded by the electrolyte, and can increase the adhesion with the positive electrode active material.

[0084] For example, if Figure 2 , Figure 3 As shown, Figure 2 is a schematic diagram of an embodiment of an image to be detected provided by the present application, Figure 3 is a schematic diagram of another embodiment of the image to be detected provided by the present application; Figure 2 The image to be detected shown in FIG is obtained by collecting the anode electrode piece, and the anode electrode piece includes the electrode piece width direction ( Figure 2 Roller partitions arranged in the AB direction and the BA direction ( Figure 2 Area 1 and Area 5), ​​uncoated partition ( Figure 2 Zone 2 and Zone 4) and coating partition ( Figure 2 Area 3); Figure 3 The image to be detected shown in FIG. 1 is obtained by collecting the cathode electrode piece, and the cathode electrode piece includes the electrode piece width direction ( Figure 3 Roller partitions arranged in the CD direction and DC direction ( Figure 3 Area 1 and Area 2), uncoated partition ( Figure 3 Zone 2 and Zone 6), Ceramic Partition ( Figure 3 Zones 3 and 5) and coating zones ( Figure 3 Area 4).

[0085] In one embodiment, an image acquisition device can be used to acquire images of the pole piece in real time to obtain an image to be detected acquired by the pole piece; wherein the image acquisition device can be a CCD (Charge Coupled Device) camera, etc., which is not limited here. Of course, in other embodiments, the image to be detected acquired by the pole piece can also be obtained from cloud storage or local storage, which is not specifically limited here.

[0086] Since the shooting field of view of a single image acquisition device is limited, the size of the pole piece that can be captured is limited; that is, for a wide pole piece, a single image acquisition device cannot capture the image to be detected including the complete pole piece. Therefore, in one embodiment, at least two image acquisition devices arranged along the width direction of the pole piece are used to simultaneously capture images of the pole piece to obtain the image to be detected captured from the pole piece. Of course, in other embodiments, for a narrow pole piece, a single image acquisition device can also be used to capture images of the pole piece to obtain the image to be detected captured from the pole piece.

[0087] The number of image acquisition devices for acquiring images of the electrode at the same acquisition moment is not limited and can be specifically set according to actual use needs. Figure 4 and Figure 5 As shown, Figure 4 is a schematic diagram of the layout of the image acquisition device provided in this application, Figure 5 This is a schematic diagram of the arrangement of two image acquisition devices provided by the present application; the width of the wide-width pole piece is 1500mm-1600mm, and the field of view of a single image acquisition device is 775mm. Therefore, two image acquisition devices arranged along the width direction of the pole piece are used to acquire images of the pole piece at the same time, thereby obtaining an image to be detected acquired from the pole piece, and the image to be detected includes the complete pole piece. For another example, the width of the narrow-width pole piece is about 700mm, and a single image acquisition device can be set to acquire an image to be detected including the complete pole piece.

[0088] In a specific embodiment, Figure 6 As shown, Figure 6It is a structural schematic diagram of an embodiment of a coating system provided in the present application. The coating system 60 includes a unwinding mechanism 61, an A-side die 62 (first coating mechanism) corresponding to one coating surface (first coating surface), a lower oven 63 corresponding to one coating surface, a B-side die 64 (second coating mechanism) corresponding to another coating surface (second coating surface), an upper oven 65 corresponding to another coating surface (second coating surface), two image acquisition devices 91, a winding mechanism 66, a roller 67 and a light source 68. The electrode sheet is used to be wound on the unwinding mechanism 61, and is successively passed through the A-side die 62, the lower oven 63, the B-side die 64, and the upper oven 65, and then wound by the winding mechanism 66. The A-side die 62 is used to coat the first coating surface (one coating surface) of the electrode sheet, so as to coat the positive or negative electrode active material on the first coating surface of the electrode sheet. The lower oven 63 is used to dry the wet film after coating the first coating surface. The B-side die 64 is used to coat the second coating surface (the other coating surface) of the electrode sheet, so as to coat the positive or negative electrode active material on the second coating surface of the electrode sheet. The upper oven 65 is used to dry the wet film after coating the second coating surface, so that the electrode sheet in the dry film state can be output from the upper oven, which is convenient for the winding mechanism 66 to wind up, thereby facilitating the subsequent battery cell winding operation.

[0089] Among them, after the electrode is output from the second drying mechanism, it will pass through two image acquisition devices, one image acquisition device acquires an image of the first coated surface of the electrode, and the other image acquisition device acquires an image of the second coated surface of the electrode, thereby obtaining the images to be detected corresponding to each coated surface of the electrode. In other words, two image acquisition devices are added to the coating system, and the coating and correction of the electrode are integrated, so that the coating images of the two relatively coated surfaces of the electrode can be collected in time before the coating is completed and rolled up.

[0090] In addition, two image acquisition devices may be provided on both sides, that is, after the electrode piece is output from the second drying mechanism, it will pass through the two image acquisition devices located above and the two image acquisition devices located below (the two image acquisition devices located on the same side are arranged along the width direction of the electrode piece), and the two image acquisition devices simultaneously capture images of the first coated surface of the electrode piece, and the two image acquisition devices simultaneously capture images of the second coated surface of the electrode piece, thereby obtaining images to be detected corresponding to each coated surface.

[0091] In a specific embodiment, the image to be detected is obtained by stitching at least two initial images acquired by at least two image acquisition devices at the same acquisition time. Before acquiring the image to be detected acquired by the polar piece, in response to the presence of abnormal images in the at least two initial images, the at least two initial images are discarded. In other words, the abnormal initial images are not stitched to generate the image to be detected, thereby reducing resource consumption. The type of abnormal image is not limited; for example, the abnormal image can be an initial image with low clarity, an initial image with an unsatisfactory size, etc.

[0092] Step S12: determining at least one edge-grabbing area in the image to be detected according to the preset edge-grabbing area information.

[0093] In this embodiment, at least one edge grabbing area is determined in the image to be detected according to the preset edge grabbing area information; wherein the preset edge grabbing area information includes the position information and / or size information of the edge grabbing area. The preset edge grabbing area information includes the position information and / or size information of the edge grabbing area, so according to the preset edge grabbing area information, the edge grabbing area in the image to be detected can be quickly located, so that the width information related to the pole piece can be quickly determined later, thereby improving the efficiency of pole piece detection.

[0094] Among them, the position information of the edge grabbing area included in the preset edge grabbing area information is not limited, and can be specifically set according to actual use needs. For example, the position information of the edge grabbing area included in the preset edge grabbing area information is the center of the edge grabbing area; for another example, the edge grabbing area is a rectangle, and the position information of the edge grabbing area included in the preset edge grabbing area information is the position coordinates of the upper left corner vertex and the position coordinates of the lower right corner vertex of the edge grabbing area. In addition, the size information of the edge grabbing area included in the preset edge grabbing area information is not limited. For example, the edge grabbing area included in the preset edge grabbing area information is a square area with a side length of 2mm. For another example, the edge grabbing area included in the preset edge grabbing area information is a rectangular area with a length of 2mm and a width of 3mm. For another example, the edge grabbing area included in the preset edge grabbing area information is a circular area with a radius of 2mm.

[0095] For example, if Figure 7 As shown, Figure 7 It is a schematic diagram of an embodiment of the edge grabbing area provided in the present application. According to the preset edge grabbing area information, six edge grabbing areas (A, B, C, D, E, and F) are determined in the image to be detected, and the six edge grabbing areas are square areas.

[0096] In one embodiment, when the electrode piece is an anode electrode piece, at least four edge-grabbing areas are determined in the image to be detected according to the preset edge-grabbing area information, or when the electrode piece is a cathode electrode piece, at least six edge-grabbing areas are determined in the image to be detected according to the preset edge-grabbing area information. Figure 7 As shown, Figure 7 It is the cathode electrode. According to the preset edge grabbing area information, 6 edge grabbing areas are determined in the image to be detected.

[0097] In one embodiment, the preset edge-grabbing region information is automatically determined and generated before at least one edge-grabbing region is determined in the image to be detected, and the efficiency of determining and generating the preset edge-grabbing region information is higher. Of course, in other embodiments, the preset edge-grabbing region information can also be manually set by the user, which is not specifically limited here.

[0098] In one embodiment, before determining at least one edge grabbing area in the image to be detected, in response to the image to be detected being an abnormal image, the image to be detected is discarded. In other words, the abnormal image to be detected is not detected, thereby reducing resource consumption. The type of abnormal image is not limited; for example, the abnormal image may be an image to be detected with low definition, an image to be detected with an unsatisfactory size, an image to be detected with an insufficient number of partitions, etc.

[0099] Step S13: performing boundary detection on each edge-grabbing area to obtain a first boundary line in each edge-grabbing area.

[0100] In this embodiment, the boundary detection is performed on each edge grabbing area to obtain the first boundary line in each edge grabbing area; wherein the first boundary line is used to divide the pole pieces into different partitions arranged in the width direction.

[0101] In one embodiment, the boundary detection of each edge-grabbing area is performed in multiple threads, that is, the boundary detection is performed on multiple edge-grabbing areas in the image to be detected at the same time, thereby improving the efficiency of obtaining the first boundary line in each edge-grabbing area.

[0102] In a specific implementation, the boundary detection of each edge grabbing area is performed using one thread. That is, the boundary detection of one edge grabbing area corresponds to one thread, that is, the first boundary line of each edge grabbing area in the image to be detected is captured at the same time to speed up the calculation speed and reduce the processing time of a single image to be detected.

[0103] Since the grayscale values ​​of different partitions of the pole piece are different, or in other words, since the grayscale intervals of different partitions of the pole piece are different, when the grayscale significances on both sides of a line in the edge grabbing area are different, it indicates that the left and right sides of the line belong to different partitions of the pole piece, and the line is the boundary line between the two partitions in the edge grabbing area. Therefore, in one embodiment, the first boundary line in the edge grabbing area can be determined by the grayscale distribution of the edge grabbing area.

[0104] Step S14: using the first boundary line in each edge grasping area, determine the width information related to the pole piece.

[0105] In this embodiment, the first boundary lines in each edge gripping area are used to determine the width information related to the electrode piece. A partition is formed between two first boundary lines, and the width of the partition corresponding to the two first boundary lines can be determined by the distance between the two first boundary lines corresponding to the partition.

[0106] Optionally, the width information related to the pole piece includes but is not limited to the width of the coating partition, the width of the ceramic partition, the width of the pole piece, the width of the uncoated partition, and the width of the roller partition.

[0107] In the above implementation, at least one edge grabbing area is determined in the image to be detected according to the preset edge grabbing area information, and the boundary detection is performed on each edge grabbing area to obtain the first boundary line in each edge grabbing area, and the width information related to the electrode piece is determined using the first boundary line in each edge grabbing area. Therefore, automatic detection of the electrode piece can be achieved.

[0108] Furthermore, the above scheme can also use the preset edge grabbing area to determine the width information related to the pole piece, thereby realizing automatic detection of the width information related to the pole piece; in addition, the preset edge grabbing area does not require user setting, thereby improving the detection efficiency of the width information related to the pole piece.

[0109] In one embodiment, if Figure 8 As shown, Figure 8 It is a flow chart of another embodiment of the pole piece detection method provided by the present application, wherein the width information includes coating-related width information that can characterize the position and / or width of the coating area of ​​the two coating surfaces of the pole piece; after the width information related to the pole piece is determined by using the first boundary line in each edge grabbing area, the coating deviation correction of the pole piece is also performed, which specifically includes the following steps:

[0110] Step S81: Determine coating misalignment information using coating-related width information.

[0111] In this embodiment, the coating misalignment information is determined using the coating-related width information; wherein the coating misalignment information characterizes the misalignment of the coating area. Since the width information includes the position and / or width of the coating area that can characterize the two coating surfaces of the electrode, the misalignment between the coating areas in the two coating surfaces (i.e., whether the coating areas of the two coating surfaces are aligned) can be determined based on the coating-related width information; or, the misalignment between the coating area in the coating surface and the coating standard position in the coating surface (i.e., whether the coating area in the coating surface is located at the coating standard position in the coating surface) can be determined based on the coating-related width information.

[0112] In one embodiment, the coating misalignment information includes second misalignment information, which characterizes the misalignment between the coating areas of the two coating surfaces. Subsequently, the coating areas of the two coating surfaces are corrected based on the second misalignment information, so that the coating areas of the two coating surfaces are aligned after the correction.

[0113] In other embodiments, the coating misalignment information includes first misalignment information and second misalignment information, wherein the first misalignment information represents the misalignment between a coating area of ​​a coating surface and a marked coating position of the coating surface, and the second misalignment information represents the misalignment between the coating areas of two coating surfaces. Subsequently, the position of the coating area on the coating surface will be corrected based on the first misalignment information, so that the coating surface corresponding to the first misalignment information after correction is located at the standard coating position in the coating surface; similarly, the regional correction of the coating areas of the two coating surfaces will be performed based on the second misalignment information, so that the coating areas of the two coating surfaces are aligned after correction; and since the coating surface corresponding to the first misalignment information is located at the standard coating position in the coating surface after correction, the coating area in the other coating surface aligned with the coating surface after correction is naturally also located at the standard coating position in the corresponding coating surface. Therefore, subsequent correction based on the first misalignment information and the second misalignment information can align the coating areas of the two coating surfaces after correction and both be located at the standard coating position on the coating surface.

[0114] It should be noted that the two coating surfaces are the front and back coating surfaces of the same electrode, so the standard coating positions corresponding to the coating surfaces are the same.

[0115] Since the standard coating positions of the two coating surfaces of the same electrode are the same, when the coating areas on the two coating surfaces are both located at the standard coating positions in the corresponding coating surfaces, the coating areas on the two coating surfaces must be aligned and both located at the standard coating positions in the coating surfaces. Therefore, in other embodiments, the coating misalignment information includes two first misalignment information, one first misalignment information characterizes the misalignment between the coating area of ​​one coating surface and the standard coating position of the coating surface, and the other first misalignment information characterizes the misalignment between the coating area of ​​another coating surface and the standard coating position of the coating surface. Subsequently, the position of a coating area on the corresponding coating surface will be corrected based on the first misalignment information, so that the coating area corresponding to the first misalignment information after correction is located at the standard coating position in the corresponding coating surface; similarly, the position of another coating area on the corresponding coating surface will be corrected based on the other first misalignment information, so that the coating area corresponding to the first misalignment information after correction is located at the standard coating position in the corresponding coating surface. Therefore, the subsequent correction based on the two first misalignment information can make the coating areas of the two coating surfaces aligned after the correction and both located at the standard coating positions on the coating surfaces.

[0116] Step S82: Based on the coating misalignment information, use a correction mechanism to correct at least one of the coating mechanisms and pole pieces of the two coating surfaces, so that after correction, the coating areas of the two coating surfaces are aligned and / or are both located at the standard coating positions in the coating surfaces.

[0117] In this embodiment, based on the coating misalignment information, a correction mechanism is used to correct at least one of the coating mechanisms and pole pieces of the two coating surfaces, so that the coating areas of the two coating surfaces are aligned and / or both are located at the standard coating position on the coating surface after correction. In other words, correction will be performed in a timely manner according to the misalignment of the coating areas on the coating surface of the pole piece, so that the coating areas of the two coating surfaces of the pole piece are aligned and both are located at the standard coating position on the coating surface, so as to ensure the quality of the pole piece, thereby ensuring the capacity consistency, safety and reliability of the battery cell manufactured based on the pole piece in the future. In addition, the misalignment of the coating areas on the two coated surfaces of the electrode is automatically determined based on the coating image, and the correction based on the misalignment of the coating areas on the two coated surfaces is also automatically performed, all without the need for manual operation; that is, the electrode coating correction method provided in the present application can timely and accurately determine the misalignment of the coating areas on the coated surfaces and can timely and accurately correct the misalignment based on the misalignment of the coating areas on the two coated surfaces, has a fast response to the electrode coating correction, high efficiency, high correction accuracy, and reduces the burden on staff.

[0118] It should be noted that it is not limited to the need to correct the coating mechanisms of the two coating surfaces so that the coating areas of the two coating surfaces are aligned and located at the standard coating positions on the coating surfaces after correction; for example, the coating mechanisms of the two coating surfaces may be corrected separately, or the coating mechanism and the pole piece of one coating surface may be corrected, or the coating mechanism and the pole piece of two coating surfaces may be corrected.

[0119] In addition, so that the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions in the coating surfaces after the correction, it means that, after the two coating surfaces of the new substrate material strip are subsequently coated by the corresponding coating mechanism, the coating areas of the two coating surfaces are aligned and both are located at the standard coating positions in the coating surface; that is to say, the purpose of correcting the deviation of at least two of the coating mechanisms and pole pieces of the two coating surfaces is to ensure that the subsequent coating of the pole piece is not misplaced, and the coating situation of the pole piece corresponding to the coating image can no longer be adjusted.

[0120] In one embodiment, if Figure 6 As shown, the coating system also includes a correction mechanism, which can be used to correct the deviation so that the coating areas of the two coating surfaces are aligned and / or are both located at the standard coating position in the coating surface after the correction. In a specific embodiment, the coating system includes a first correction mechanism and a second correction mechanism, the first correction mechanism is arranged between the unwinding mechanism and the first coating mechanism, and the second correction mechanism is arranged between the first drying mechanism and the second coating mechanism. The first correction mechanism can be used to correct the first coating mechanism and / or the pole piece, and the second correction mechanism can be used to correct the second coating mechanism and / or the pole piece.

[0121] If there is an abnormality in the electrode sheet, it will affect the quality of the battery generated based on the electrode sheet, such as causing poor capacitance consistency, low safety, high self-discharge, capacity decay, etc. Therefore, in one embodiment, if Fig. 9 As shown, Fig. 9 This is a flow chart of another embodiment of the electrode detection method provided by the present application. It is also necessary to detect the quality of the electrode to avoid subsequent batch scrapping of the electrode, which specifically includes the following steps:

[0122] Step S91: Determine a quality detection area in the image to be detected.

[0123] In this embodiment, a quality detection area in the image to be detected is determined; wherein the quality detection area includes one or more partitions in the width direction of the pole piece.

[0124] In one embodiment, the quality detection area is all the partitions in the width direction of the pole piece. Of course, in other embodiments, the quality detection area is part of the partitions in the width direction of the pole piece, which is not limited here.

[0125] If the coated active material is detached during the drying process of the coated electrode, the battery prepared based on the electrode will have low capacity, unstable internal resistance, low cycle times, and even short circuit in the battery. In severe cases, it may cause the battery to catch fire and explode. Therefore, in one specific embodiment, if it is necessary to detect whether the electrode has metal leakage flaws / defects, the coating partition can be defined as a quality inspection area to reduce the size of the area to be inspected and improve the efficiency of quality inspection. Of course, in other specific embodiments, if it is necessary to detect whether the electrode has metal leakage flaws / defects, all partitions can be used as quality inspection areas.

[0126] For example, if Figure 2 As shown, take the detection of whether there is metal leakage flaw / defect in the electrode as an example: Since it is necessary to detect whether there is metal leakage flaw / defect in the electrode, Figure 2 The coating partition in Figure 2 The area 3) in is used as the quality detection area. For example, Figure 3 As shown, take the detection of whether there is metal leakage flaw / defect in the electrode as an example: Since it is necessary to detect whether there is metal leakage flaw / defect in the electrode, Figure 3 The coating partition in Figure 3 Zone 3) and ceramic partitions ( Figure 3 Area 2 and area 5) in the figure are both used as quality detection areas.

[0127] Since the grayscale values ​​of different partitions of the electrode (such as coated partitions, uncoated partitions, ceramic partitions, etc.) in the collected image are different, the grayscale values ​​of the same partitions in the collected image are basically the same, or in other words, the grayscale values ​​of the same partitions in the collected image will belong to their corresponding grayscale intervals, and the grayscale intervals corresponding to different partitions are different. Therefore, the areas belonging to various partitions in the image to be detected can be determined by the grayscale values ​​of the pixels in the image to be detected, thereby determining the required quality detection area. Therefore, in one embodiment, if Fig.10 As shown, Fig.10 yes Fig. 9 The flowchart of step S91 of an embodiment is shown, in which the grayscale values ​​of each partition of the electrode piece in the collected image to be detected belong to different grayscale intervals, and the quality detection area in the image to be detected is determined, which specifically includes the following sub-steps:

[0128] Step S101: Find the first pixel whose grayscale value belongs to the target grayscale range from the image to be detected.

[0129] In this implementation, a first pixel point whose grayscale value belongs to a target grayscale interval is found from the image to be detected.

[0130] For example, take the grayscale interval of the coated partition as a grayscale value of 40-60 and the grayscale interval of the uncoated partition as a grayscale value greater than 200: if the coated partition is required as the quality inspection area, then take the grayscale interval of 40-60 as the target grayscale interval, and find the first pixel point with a grayscale value between 40-60 from the image to be inspected.

[0131] For example, take the grayscale interval of the coated partition as a grayscale value of 20-40, the grayscale interval of the uncoated partition as a grayscale value greater than 220, and the grayscale interval of the ceramic partition as a grayscale value of 110-130: if the coated partition and the ceramic partition are required to be quality inspection areas, then the grayscale interval of 20-40 and the grayscale interval of 110-130 are used as target grayscale intervals, and the first pixel points with grayscale values ​​between 20-40 and 110-130 are found from the image to be inspected.

[0132] Step S102: Acquire a connected domain formed by the first pixel point as a quality detection area.

[0133] In this embodiment, the connected domain formed by the first pixel points is obtained as the quality detection area. In other words, the area formed by the first pixel points is used as the quality detection area.

[0134] Step S92: Perform quality inspection on the quality inspection area to obtain a quality inspection result of the quality inspection area.

[0135] In this embodiment, the quality inspection area is subjected to quality inspection to obtain a quality inspection result of the quality inspection area. The quality inspection area is subjected to quality inspection to determine whether there are defects / blemishes in the quality inspection area.

[0136] A quality inspection area corresponds to a partition of the electrode. Therefore, when the partition corresponding to the quality inspection area has high quality and no defects / flaws, the grayscale distribution of the quality inspection area is uniform and consistent, and there is no obvious difference. When there are defects / flaws in the partition corresponding to the quality inspection area, there will be obvious differences in the grayscale distribution of the defective / flawed part in the quality inspection area and the grayscale distribution of other parts of the quality inspection area. Therefore, in one embodiment, a quality inspection is performed on the quality inspection area to obtain a quality inspection result of the quality inspection area, specifically: using the grayscale distribution in the quality inspection area to determine whether there are defects in the quality inspection area. Through the difference in grayscale distribution in the quality inspection area, it can be accurately and quickly determined whether there are defects in the quality inspection area.

[0137] In one specific embodiment, the quality inspection area includes a ceramic partition and a coating partition, and defects include metal leakage in the ceramic partition or the coating partition. By performing quality inspection on the ceramic partition and the coating partition of the electrode, it is determined whether there is metal leakage in the ceramic partition and the coating partition, and whether there are defects in the electrode during the coating process is determined in time to avoid subsequent coating batch scrapping. In other specific embodiments, the quality inspection area includes a ceramic partition and a coating partition, and defects may also be bubbles, particles, pinholes, etc. in the ceramic partition or the coating partition. In other specific embodiments, the quality inspection area includes each partition of the electrode, and defects may be bends, creases, wrinkles, indentations, cracks, etc. in each partition. In other specific embodiments, the quality inspection area includes the edge partitions of the electrode, and defects may be material shedding, notches, cracks, etc. in each edge partition.

[0138] In one embodiment, if Fig.11 As shown, Fig.11 This is a flow chart of an embodiment of determining whether a quality inspection area has defects by using the grayscale distribution of the quality inspection area provided by the present application. Determining whether a quality inspection area has defects by using the grayscale distribution in the quality inspection area specifically includes the following sub-steps:

[0139] Step S111: searching for a number of second pixel points whose grayscale values ​​do not belong to the target grayscale interval in the quality detection area.

[0140] In this implementation, a number of second pixel points whose grayscale values ​​do not belong to the target grayscale interval are found from the quality detection area.

[0141] For example, taking the target grayscale interval as the grayscale interval corresponding to the coating partition, and the grayscale interval of the coating partition as the grayscale value 40-60: from the image to be detected, find out several second pixel points whose grayscale values ​​are not between 40-60.

[0142] For another example, taking the target grayscale interval as the grayscale interval corresponding to the coating partition and the grayscale interval corresponding to the ceramic partition, the grayscale interval of the coating partition is a grayscale value of 20-40, and the grayscale interval of the ceramic partition is a grayscale value of 110-130: from the image to be detected, find several second pixel points whose grayscale values ​​are not between 40-60 and not between 110-130.

[0143] Step S112: using a plurality of second pixel points to determine at least one suspected defect area.

[0144] In this embodiment, at least one suspected defect region is determined using a plurality of second pixel points, that is, a region formed by a plurality of second pixel points is used as a suspected defect region.

[0145] Step S113: In response to the suspected defect area meeting the preset size requirement, determining that a defect exists in the suspected defect area.

[0146] In this embodiment, in response to the suspected defect region meeting the preset size requirement, it is determined that the suspected defect region has a defect. That is, only when the suspected defect region meets the preset size requirement, the suspected defect region is regarded as a defect region existing in the quality inspection region, rather than all determined suspected defect regions being regarded as defect regions existing in the quality inspection region, thereby improving the accuracy of quality inspection.

[0147] The preset size includes at least one of an area meeting a preset area condition and a width meeting a preset width condition. The preset area condition and the preset width condition are not limited and can be specifically set according to actual use needs.

[0148] For example, taking the defect as metal leakage in the coating partition, the target grayscale interval is the grayscale interval corresponding to the coating partition, the grayscale interval of the coating partition is a grayscale value of 40-60, and the grayscale interval corresponding to the metal leakage is a grayscale value of 170-255: find out a number of second pixel points whose grayscale values ​​are not between 40-60 from the quality inspection area, and find out a number of second pixel points whose grayscale values ​​are between 170-255 from the quality inspection area; use the several second pixel points to determine the suspected defect area A and the suspected defect area B; because the suspected defect area A meets the preset size requirement and the suspected defect area B does not meet the preset size requirement, it is determined that the suspected defect area A has metal leakage and the suspected defect area B does not have metal leakage.

[0149] See also Fig.12 , Fig.12 yes Figure 1 It should be noted that if there is substantially the same result, the embodiments of the present application are not limited to the above embodiments. Fig.12 The process sequence shown is limited. Fig.12 As shown, this embodiment includes:

[0150] Step S121: obtaining at least two initial images acquired by at least two image acquisition devices at the same acquisition time.

[0151] In this embodiment, at least two initial images of the pole piece acquired by at least two image acquisition devices at the same acquisition time are acquired; wherein the plurality of image acquisition devices are arranged along the width direction of the pole piece.

[0152] The number and type of the image acquisition devices arranged along the width direction of the pole piece are not limited. For example, the image acquisition device is a CCD camera, and the number of the image acquisition devices arranged along the width direction of the pole piece is two.

[0153] Step S122: Determine the overlapping area in at least two initial images.

[0154] When at least two image acquisition devices are used to acquire the image to be detected corresponding to the electrode piece, there may be a situation where the shooting fields of some image acquisition devices overlap. Therefore, in this embodiment, the overlapping area in at least two initial images is determined.

[0155] There is no limitation on the method of determining the overlapping area in at least two initial images, and it can be specifically set according to actual use needs.

[0156] Step S123: removing overlapping areas in at least two initial images, and splicing the at least two initial images after the removal to obtain an image to be detected.

[0157] In this embodiment, the overlapping area in at least two initial images is removed, and the at least two initial images after removal are spliced ​​to obtain the image to be detected. Specifically, after the overlapping area is determined, the overlapping area is removed and the images are spliced ​​to obtain the image to be detected of the corresponding electrode.

[0158] There is no limitation on the method of splicing the at least two removed initial images, and it can be specifically set according to actual use needs.

[0159] For example, if Figure 5 As shown, an image acquisition device A ( Figure 5 Image acquisition device on the left side) and image acquisition device B ( Figure 5The image acquisition device on the right side of the middle) simultaneously acquires images of the pole piece to obtain initial image a and initial image b; determines the overlapping area in the initial image a and the initial image b, and removes the overlapping area from the initial image a or the initial image b; if it is removed from the initial image a, the initial image b and the initial image a after removing the overlapping area are spliced ​​to obtain the image to be detected.

[0160] See also Fig.13 , Fig.13 1 is a flow chart of an embodiment of generating preset edge grabbing area information provided by the present application. It should be noted that if there is substantially the same result, the embodiments of the present application are not limited to the above embodiments. Fig.13 The process sequence shown is limited. Fig.13 As shown, this embodiment includes:

[0161] Step S131: Acquire a sample image acquired from a pole piece.

[0162] In this embodiment, a sample image acquired from a pole piece is obtained. In one embodiment, the sample image acquired from a pole piece can be acquired from local storage or cloud storage. Of course, in other embodiments, an image acquisition device can be used to acquire an image of a pole piece in real time to obtain a sample image, which is not limited here.

[0163] Step S132: Capture a plurality of second boundary lines in the sample image.

[0164] In this embodiment, a plurality of second boundary lines in the sample image are captured. In one embodiment, the boundary detection area of ​​the sample image is determined according to the area setting information input by the user or the pre-stored area setting information; and a plurality of second boundary lines are captured from the boundary detection area.

[0165] For example, if Fig.14 As shown, Fig.14 It is a schematic diagram of an embodiment of a boundary detection area provided by the present application. In response to user input of area setting information, a boundary detection area A of a sample image is determined, and a plurality of second boundary lines are captured from the boundary detection area A.

[0166] Step S133: using each second boundary line, obtaining information of the edge-grabbing area corresponding to each second boundary line, so as to obtain preset edge-grabbing area information.

[0167] In this implementation manner, each second boundary line is used to obtain information of the edge-grabbing area corresponding to each second boundary line, so as to obtain preset edge-grabbing area information.

[0168] In one embodiment, for each second boundary line, the position information of the first preset position point of the second boundary line is obtained as the position information of the second preset position point in the edge grabbing area corresponding to the second boundary line. The first preset position point of the second boundary line is not limited and can be specifically set according to actual use needs. For example, the first preset position point of the second boundary line is the midpoint of the second boundary line, which is used as the center point of the edge grabbing area corresponding to the second boundary line.

[0169] In one embodiment, the size information input by the user for the second boundary line is obtained as the size information of the edge-grabbing area corresponding to the second boundary line, or the initial area corresponding to the second boundary line is displayed, the first preset position point of the second boundary line overlaps with the second preset position point of the initial area, and in response to the user's adjustment operation on the initial area, the size of the initial area is adjusted, and the size information of the adjusted initial area is obtained as the size information of the edge-grabbing area.

[0170] See also Fig.15 , Fig.15 yes Figure 1 FIG. 1 is a flow chart of an embodiment of step S13. It should be noted that if there are substantially the same results, this embodiment does not necessarily use the same method. Fig.15 The process sequence shown is limited. Fig.15 As shown, in an embodiment of the present application, determining the first boundary line in the edge grabbing area by using the grayscale change in the edge grabbing area specifically includes:

[0171] Step S151: For each edge grabbing area, a number of boundary points are found by using the grayscale changes in the edge grabbing area.

[0172] In this embodiment, for each edge grabbing area, a plurality of boundary points are found by using the grayscale change in the edge grabbing area; wherein the grayscale change between the boundary point and the adjacent pixel point meets the boundary grayscale change requirement. Specifically, for each edge grabbing area, it is determined one by one whether the grayscale change between each pixel point in the edge grabbing area and its adjacent adjacent pixel point meets the boundary grayscale change requirement; if the grayscale change between the pixel point and its adjacent adjacent pixel point meets the boundary grayscale change requirement, it indicates that the partition where the pixel point is located is different from the partition where the adjacent pixel point is located, and the pixel point is determined to be a boundary point between two partitions in the edge grabbing area; otherwise, the pixel point is determined to be a non-boundary point.

[0173] There is no limitation on the grayscale change requirement, which can be set according to actual use needs. For example, the grayscale change requirement is that the grayscale difference is greater than or equal to the preset difference, wherein the size of the preset difference is not limited, and can be specifically set according to actual use needs; when the grayscale difference between a pixel point and its adjacent pixel points is greater than or equal to the preset difference, the grayscale difference between the pixel point and its adjacent pixel points is significant, indicating that the partition to which the pixel point belongs is different from the partition to which the adjacent pixel point belongs, and the pixel point is the boundary point between the two partitions.

[0174] Step S152: performing straight line fitting using a number of boundary points in the edge grabbing area to obtain a first boundary line in the edge grabbing area.

[0175] In this embodiment, a plurality of boundary points in the edge grabbing area are used to perform straight line fitting to obtain a first boundary line in the edge grabbing area. The method of fitting the plurality of boundary points is not limited and can be set according to actual use needs.

[0176] In one embodiment, before performing straight line fitting using a plurality of boundary points in the edge grasping region to obtain a first boundary line in the edge grasping region, abnormal boundary points are removed from the plurality of boundary points to improve the accuracy of the obtained first boundary line in the edge grasping region.

[0177] In one embodiment, if Fig.16 As shown, Fig.16 It is a schematic diagram of an embodiment of the caliper tool provided in the present application. For each edge grabbing area, after finding several boundary points by using the grayscale changes in the edge grabbing area, a cross is generated at the boundary point by using the caliper tool to mark the boundary point; abnormal intersection points are eliminated, and the remaining intersection points are used to obtain the first boundary line a in the edge grabbing area by straight line fitting.

[0178] See also Fig.17 , Fig.17 yes Figure 1 It should be noted that if there is substantially the same result, the embodiments of the present application are not limited to the above embodiments. Fig.17 The process sequence shown is limited. Fig.17 As shown, this embodiment includes:

[0179] Step S171: Determine the partitions to be divided by each first boundary line.

[0180] In this implementation, each first boundary line is determined to be used for dividing the partition.

[0181] In one embodiment, if Fig.18 As shown, Fig.18 yes Fig.17The flowchart of step S171 of an embodiment is shown, which determines the partitions to be divided by each first boundary line, and specifically includes the following sub-steps:

[0182] Step S181: Determine the partitions that each first boundary line is used to divide according to the grayscale information on both sides of each first boundary line.

[0183] In this embodiment, the partitions that each first boundary line is used to divide are determined based on the grayscale information on both sides of each first boundary line. Different partitions have different grayscale values, or in other words, different partitions belong to different grayscale intervals. Therefore, based on the grayscale information on both sides of each first boundary line, the partition types on both sides of the first boundary line can be quickly determined, thereby determining the partitions that the first boundary line is used to divide.

[0184] For example, taking the grayscale interval of the partition on the left side of the first boundary line A as grayscale value 0-10, and the grayscale interval of the partition on the right side of the first boundary line A as grayscale value greater than 220: since the grayscale interval of the partition on the left side of the first boundary line A is the grayscale interval corresponding to the photographing roller partition, the partition on the left side of the first boundary line A is the photographing roller partition; since the grayscale interval of the partition on the right side of the first boundary line A is the grayscale interval corresponding to the uncoated partition, the partition on the right side of the first boundary line A is the uncoated partition; therefore, it is determined that the first boundary line A is used to divide the photographing roller partition and the uncoated partition.

[0185] Step S182: extracting boundary line partition information of each edge-grabbing area from the preset edge-grabbing area information.

[0186] In this embodiment, the boundary line partition information of each edge grabbing area is extracted from the preset edge grabbing area information; wherein the boundary line partition information includes the partition identification, partition name or partition sorting information of the partition divided by the first boundary line in the edge grabbing area, and the partition sorting information indicates the sorting of the partition divided by the first boundary line in the multiple partitions in the width direction of the pole piece. The partition identification, partition name or partition sorting information of the partition divided by the first boundary line is helpful for the subsequent determination of the partition information divided by the first boundary line in each edge grabbing area.

[0187] For example, the boundary line partition information includes the partition sorting information of the partitions divided by the first boundary line in the edge grabbing area as an example: the first boundary line in the edge grabbing area A is used to divide the uncoated partition and the coated partition, the uncoated partition is sorted as ① in the width direction of the electrode piece, and the coated partition is sorted as ② in the width direction of the electrode piece. For another example, the boundary line partition information includes the partition identification of the first boundary line in the edge grabbing area as an example: the first boundary line in the edge grabbing area A is used to divide the uncoated partition and the coated partition, the partition identification of the uncoated partition is a, and the partition identification of the coated partition is b.

[0188] Step S183: using the boundary line partition information of each edge-grabbing area, determining the partition to be divided by the first boundary line in each edge-grabbing area.

[0189] In this embodiment, the boundary line partition information of each edge-grabbing area is used to determine the partition divided by the first boundary line in each edge-grabbing area.

[0190] For example, if the first boundary line in the edge gripping area A is used to divide the uncoated partition and the coated partition, the uncoated partition is sorted as ① in the width direction of the electrode piece, and the coated partition is sorted as ② in the width direction of the electrode piece; then, the first boundary line in the edge gripping area A is used to divide the uncoated partition with the partition sorting ① from the coated partition with the partition sorting ②. For another example, if the first boundary line in the edge gripping area A is used to divide the uncoated partition and the coated partition, the partition identification of the uncoated partition is a, and the partition identification of the coated partition is b; then, the first boundary line in the edge gripping area A is used to divide the uncoated partition with the partition identification a from the coated partition with the partition identification b.

[0191] Since there will be the same type of partitions in the electrode, according to the grayscale information on both sides of the first boundary line, the partition that the first boundary line is used to divide can be determined, but it is impossible to determine whether the partitions of the same type that other first boundary lines are used to divide are the same partitions as the partitions that it is used to divide; for example, it is determined that the first boundary line A is used to divide the photo roller partition and the uncoated partition, and the first boundary line B is used to divide the uncoated partition and the coated partition, but it is impossible to determine whether the uncoated partition corresponding to the first boundary line A and the uncoated partition corresponding to the first boundary line B are the same coated partition. It should be noted that in the case where it is determined that the partitions that the two first boundary lines are used to divide are the same, the two first boundary lines are the boundary lines corresponding to the same partition; for example, it is determined that the first boundary line A is used to divide the photo roller partition and the uncoated partition, and the first boundary line B is used to divide the uncoated partition and the coated partition. If the uncoated partition that the first boundary line A is used to divide and the uncoated partition that the first boundary line B is used to divide are the same uncoated partition, then the first boundary line A and the first boundary line B are determined to be the two boundary lines used to divide the uncoated partition.

[0192] Therefore, after determining the partitions that the first boundary line in each edge grabbing area is used to divide, it can be determined whether the partition divided by the first boundary line itself is the same as the partition divided by other first boundary lines, so that the two boundary lines corresponding to the partitions can be determined. For example, if the first boundary line α in the edge grabbing area A is used to divide the uncoated partition with the partition mark a and the coated partition with the partition mark b, and the first boundary line β in the edge grabbing area B is used to divide the uncoated partition with the partition mark b and the coated partition with the partition mark c; therefore, the first boundary line α and the first boundary line β are the two boundary lines corresponding to the partition with the partition mark b.

[0193] Step S172: Acquire the distance between two first boundary lines corresponding to each target partition as the width information of each target partition.

[0194] In this embodiment, the distance between the two first boundary lines corresponding to each target partition is obtained as the width information of each target partition. The target partition is between the two boundary lines corresponding to the target partition, so the distance between the two first boundary lines corresponding to the target partition is the width of the target partition.

[0195] Wherein, the target partition is any partition on the pole piece, or a plurality of consecutive adjacent partitions. For example, the target partition is the uncoated partition on the left side of the pole piece, so the distance between the two first boundary lines corresponding to the uncoated partition on the left side is used as the width of the uncoated partition on the left side. For another example, the target partition is formed by the uncoated partition on the left side and the adjacent coated partition, so the distance between the two first boundary lines corresponding to the target partition is used as the sum of the width of the uncoated partition on the left side and the width of the adjacent coated partition.

[0196] Please refer to Figure 6 and Fig.19 , Fig.19 1 is a schematic diagram of the electrical topology structure of an embodiment of a visual inspection system provided by the present application. The present application provides a visual inspection system 90, which includes at least one image acquisition device 91, a processing device 92 and a host computer 93. At least one image acquisition device 91 is used to acquire images of the pole piece; the processing device 92 is connected in communication with at least one image acquisition device 91, and is used to detect the pole piece using the image acquired by at least one image acquisition device 91 to obtain the detection result of the pole piece, and the detection result includes width information related to the pole piece, and the width information is determined by using the first boundary line detected in at least one edge grabbing area of ​​the image; the host computer 93 is connected to the processing device 92, and is used to display the image acquired by the image acquisition device 91, and / or to indicate the detection result.

[0197] The processing device 92 can be used to detect the pole piece using the image collected by at least one image acquisition device 91, that is, the processing device 92 of the visual inspection system 90 can realize automatic detection of the pole piece, and the detection result includes width information related to the pole piece, and the width information is determined by using the first boundary line detected in at least one edge grabbing area of ​​the image. According to the preset edge grabbing area information, at least one edge grabbing area is determined in the image to be detected, and the boundary detection is performed on each edge grabbing area to obtain the first boundary line in each edge grabbing area, and the width information related to the pole piece is determined using the first boundary line in each edge grabbing area. Therefore, automatic detection of the pole piece can be realized. Furthermore, the above scheme can also use the preset edge grabbing area to determine the width information related to the pole piece, and realize automatic detection of the width information related to the pole piece; in addition, the preset edge grabbing area does not need to be set by the user, thereby improving the detection efficiency of the width information related to the pole piece.

[0198] Furthermore, the visual inspection system 90 is also provided with a host computer 93, which can be used to display the image captured by the image acquisition device 91, so that relevant personnel can promptly know the coating status of the electrode, etc.; or, the host computer 93 can be used to prompt the detection results, so that relevant personnel can promptly know the detection status of the electrode, so that when the electrode detection is abnormal, it is convenient to timely handle it accordingly to prevent the coating batch from being scrapped. Therefore, the visual inspection system 90 provided by the present application integrates the electrode detection function and the related information display function, which can realize the automatic detection of the electrode, and can also realize image display and / or detection result prompt.

[0199] In one embodiment, the host computer 93 includes at least one, and at least one host computer 93 is at a preset position of a coating system for coating the electrode. The number and preset position of the host computers 93 are not limited, and can be specifically set according to actual use needs; for example, the number of host computers 93 is 1, 2, 5 or 10, and the preset position is the head or tail of the coating system.

[0200] In a specific embodiment, Figure 6 As shown, there are two host computers 93, one host computer 93 is set at the head of the coating system, and the other host computer 93 is set at the tail of the coating system. Since the relevant personnel generally perform relevant operations at the head and / or tail of the coating system, a host computer 93 is set at the head and tail of the coating system respectively, so that the relevant personnel at the head and tail can timely learn about the coating of the electrode and / or the detection of the electrode, so that the relevant personnel at the head and tail can timely handle the abnormality of the electrode detection when they know that the electrode detection is abnormal, so as to prevent the coating batch from being scrapped.

[0201] In other implementations, the host computer 93 also includes a mouse, a keyboard, a KVM network receiver, etc., which are not limited here.

[0202] In one embodiment, at least one image acquisition device 91 includes at least one device group, each device group includes at least one image acquisition device 91, and different device groups are used to acquire images of different sides of the electrode. That is to say, when it is necessary to acquire images of both the front and back sides of the electrode, different device groups are used to acquire images of the front and back sides of the electrode respectively. Among them, the number of device groups and the number of image acquisition devices 91 included in each device group are not limited, and can be specifically set according to actual use needs. For example, the number of device groups is 2, and each device group includes 1 image acquisition device 91; for another example, the number of device groups is 2, and each device group includes 2 image acquisition devices 91; for another example, the number of device groups is 1, and the device group includes image acquisition device 1-1 and image acquisition device 1-2.

[0203] For example, if Figure 6 As shown, taking the number of device groups as 2, each device group including one image acquisition device 91 as an example: including device group A and device group B, device group A includes one image acquisition device 91 ( Figure 6 The device group B includes an image acquisition device 91 ( Figure 6 After the electrode piece is output from the upper oven 65, it will pass through the image acquisition devices 91 in device group A and device group B. The image acquisition devices 91 included in device group A and device group B are located on both sides of the electrode piece. Therefore, the image acquisition device 91 of device group A captures the image of one coated surface of the electrode piece, and the image acquisition device 91 of device group B captures the image of the other coated surface of the electrode piece.

[0204] For another example, take the case where the number of device groups is 2 and each device group includes 2 image acquisition devices: including device group A and device group B, each of which includes 2 image acquisition devices; after the electrode piece is output from the upper oven, it will pass through the two image acquisition devices in device group A and device group B; the two image acquisition devices in device group A simultaneously acquire images of one coated surface of the electrode piece; at the same time, the two image acquisition devices in device group B acquire images of the other coated surface of the electrode piece. It should be noted that when the two image acquisition devices simultaneously acquire images of one coated surface of the electrode piece, the shooting fields of the two image acquisition devices may overlap, so the images acquired by the two image acquisition devices may have overlapping areas; therefore, if the images acquired by the two image acquisition devices are to be used as the images to be detected acquired by the electrode piece, the two images acquired by the two image acquisition devices need to be spliced ​​after removing the overlapping areas. In addition, the use of two image acquisition devices to acquire images of the same coated surface increases the field of view, which can be applied to the image acquisition of wide-width electrode pieces.

[0205] In one embodiment, at least one device group includes a first device group and a second device group, and the processing device includes a main processing device 921 and a slave processing device 922; the main processing device 921 is connected to the first device group, and is used to detect the image collected by the first device group; the slave processing device 922 is connected to the second device group, and is used to detect the image collected by the second device group, obtain the second detection result, and send at least one of the image collected by the second device group and the second detection result to the main processing device 921; the main processing device 921 is connected to the host computer, and is also used to send the images collected by the first device group and the second device group to the host computer, and / or, prompt the first detection result and the second detection result. That is to say, when the visual inspection system includes two device groups, one processing device cannot support the normal operation of the two device groups at the same time, so the master-slave processing device 921 is set, and the master-slave processing device 921 is connected to a device group respectively to ensure its normal operation.

[0206] For example, if Fig.19 and Fig. 20 As shown, Fig. 20 The electrical topology diagram of another embodiment of the visual inspection system provided by the present application, the first device group A includes two image acquisition devices ( Fig.19 The first device group A includes two image acquisition devices ( Fig.19 The acquisition cards 1-1 and 1-2 in the first device group A are connected to the main processing device 921, and the main processing device 921 detects the images acquired by the two image acquisition devices included in the first device group A; the second device group B includes two image acquisition devices ( Fig. 20The second device group B includes two image acquisition devices ( Fig. 20 The acquisition card 2-1 and acquisition card 2-2 in the second device group B are connected to the slave processing device 922, and the slave processing device 922 processes the two image acquisition devices ( Fig. 20 The upper computer 93 receives the images collected by the first device group A and the second device group B sent by the main processing device 921 on the one hand, so that relevant personnel can promptly know the coating and other related conditions of the electrode, and on the other hand, can prompt the first detection result and the second detection result, so that relevant personnel can promptly know the detection status of the electrode.

[0207] In a specific embodiment, the image acquisition device 91 is a first type of acquisition device, and the visual inspection system 90 further includes two light source modules 94, each of which includes a light source 941 and a light source controller 942 connected to each other, and the light source controllers 942 of the two light source modules 94 are respectively connected to the main processing device 921 and the slave processing device 922, so that the corresponding connected processing device 92 instructs the light source controller 942 to control the corresponding light source 941 to work. Specifically, the main processing device 921 corresponds to a light source module 94 (such as Fig.19 As shown, the main processing device 921 corresponds to the light source 1 and the light source controller 1), and the slave processing device 922 corresponds to a light source module 94 (such as Fig. 20 As shown, the slave processing device 922 corresponds to the light source 2 and the light source controller 2); for the main processing device 921, the light source controller 942 of the corresponding light source module 94 is connected to the main processing device 921, and the light source 941 of the corresponding light source module 94 is connected to the corresponding light source controller 942; for the slave processing device 922, the light source controller 942 of the corresponding light source module 94 is connected to the slave processing device 922, and the light source 941 of the corresponding light source module 94 is connected to the corresponding light source controller 942.

[0208] In one specific implementation, the master processing device and the slave processing device are connected via a network. Of course, in other specific implementations, the master processing device and the slave processing device may also be connected via a physical connection line, which is not limited here.

[0209] In one embodiment, the image acquisition device 91 is a first type of acquisition device, and the visual inspection system 90 also includes a light source 941 for providing shooting light for the first type of acquisition device. The light source 941 and the first type of acquisition device are respectively located on both sides of the target normal, and the target normal is the normal of the tangent between the pole piece and the roller used to transport the pole piece; wherein, there is a first distance between the intersection of the optical axis of the first type of acquisition device and the acquisition surface and the target tangent point, the acquisition surface is the side of the pole piece facing the first type of acquisition device, and the target tangent point is the tangent point between the pole piece and the roller used to transport the pole piece, and the first distance can make the incident amount of the reflected light from the roller to the light source 941 incident on the first type of acquisition device lower than a preset threshold.

[0210] Specifically, if Fig.21 As shown, Fig.21 Schematic diagram of a shooting point of an embodiment of the image acquisition device provided by the present application, the first distance d between the intersection point a between the optical axis of the first type of acquisition device and the acquisition surface c, and the tangent point b between the pole piece and the roller 67, can make the incident amount of the reflected light of the roller to the light source 941 incident on the first type of acquisition device lower than the preset threshold, thereby improving the quality of the image of the pole piece collected. The size of the preset threshold is not limited.

[0211] In one embodiment, if Fig. 22 As shown, Fig. 22 It is a schematic diagram of the installation of an embodiment of the image acquisition device provided by the present application. The image acquisition device 91 is a first-class acquisition device. The visual inspection system 90 also includes a light source 941 for providing shooting light for the first-class acquisition device. The light source 941 and the first-class acquisition device are respectively located on both sides of the target normal e. The target normal e is the normal of the tangent between the pole piece and the roller 67 for conveying the pole piece. The second distance d2 between the first-class acquisition device and the acquisition surface c is related to the focal length of the first-class acquisition device. Specifically, the second distance d2 between the first-class acquisition device and the acquisition surface c / focal length = field of view / target surface size, wherein the target surface size is equivalent to the sensor length of the image acquisition device 91.

[0212] In one embodiment, the image acquisition device 91 is a first type acquisition device, and the visual inspection system 90 further includes a light source 941 for providing shooting light for the first type acquisition device. The light source 941 and the first type acquisition device are respectively located on both sides of the target normal line e, and the target normal line e is the normal line of the tangent line between the pole piece and the roller 67 for conveying the pole piece; wherein, Fig. 22As shown, there is a first angle α between the irradiation light of the light source 941 and the target normal e, and there is a second angle β between the optical axis of the first type of acquisition device and the target normal e. The magnitude of at least one of the first angle α and the second angle β can make the illumination intensity of the shooting area of ​​the first type of acquisition device meet the requirements. Among them, the illumination intensity that meets the requirements is not limited and can be specifically set according to actual use needs.

[0213] In one embodiment, the image acquisition device 91 is a first type of acquisition device, and the visual inspection system 90 also includes a light source 941 for providing shooting light for the first type of acquisition device. The light source 941 and the first type of acquisition device are respectively located on both sides of the target normal e, and the target normal e is the normal of the tangent between the pole piece and the roller 67 for conveying the pole piece; wherein, there is a third distance between the light source 941 and the acquisition surface. When there is a third distance d3 between the light source 941 and the acquisition surface c, the light intensity of the shooting area of ​​the first type of acquisition device will be greater, so that the image captured by the subsequent image acquisition device 91 will be clearer and of higher quality.

[0214] In one embodiment, the image acquisition device 91 is a second-type acquisition device, which is connected to multiple acquisition cards corresponding to the second-type acquisition device, and the multiple acquisition cards corresponding to the second-type acquisition device are connected to the processing device 92; wherein, the multiple acquisition cards corresponding to the second-type acquisition device are connected to each other through an inter-board synchronization line, and the encoder of the visual inspection system 90 transmits an acquisition trigger signal to one of the acquisition cards, and one of the acquisition cards is synchronized with the remaining acquisition cards corresponding to the second-type acquisition device through the inter-board synchronization line to trigger the second-type acquisition device to perform image acquisition.

[0215] In one embodiment, the visual inspection system 90 further includes a signal distributor connected to the encoder, and the acquisition trigger signal sent by the encoder outputs a multi-channel acquisition trigger signal through the signal distributor, so as to be transmitted to each acquisition card respectively, so as to trigger the second type of acquisition device to perform image acquisition. In other words, when the encoder of the visual inspection system 90 rotates, a pulse signal is generated, and after one acquisition card receives the pulse signal, the remaining acquisition cards are synchronized through the inter-board synchronization line, which triggers the second type of acquisition device to perform image acquisition.

[0216] In one embodiment, the encoder of the visual inspection system 90 generates a pulse signal when it rotates. The pulse signal is divided into multiple signals after passing through a signal distributor. After each acquisition card receives the pulse signal, the multiple signals trigger the second type of acquisition device to perform image acquisition.

[0217] In one embodiment, the second type of acquisition device is a macro camera, which uses an integrated design of sensor, lens, and light source, is easy to install, and saves space; a camera equipped with a line sensor can capture high-resolution images at high speed in a wide range. Of course, in other embodiments, the second type of acquisition device can also be other types of acquisition devices, which are not limited here.

[0218] In one embodiment, the inter-board synchronization line is a Cameralink data line. Of course, in other embodiments, the inter-board synchronization line may also be other types of data lines, which are not limited here.

[0219] For example, if Fig.23 As shown, Fig.23 It is a schematic diagram of an embodiment of the electrical wiring of a macro camera provided in the present application, taking the second type of acquisition device as a macro camera as an example: the four acquisition cards (acquisition card 1, acquisition card 2, acquisition card 3 and acquisition card 4) corresponding to the macro camera A are connected through a Cameralink data line B, the macro camera A is connected to the four acquisition cards corresponding to the macro camera A, and the four acquisition cards are connected to the processing device 92; the encoder C of the visual inspection system 90 transmits the acquisition trigger signal to the acquisition card 4, and the acquisition card 4 is synchronized with the acquisition cards 1, 2 and 3 through the Cameralink data line B to trigger the macro camera A to perform image acquisition; or, the acquisition trigger signal emitted by the encoder C of the visual inspection system 90 outputs 4 acquisition trigger signals through a signal distributor, which are respectively transmitted to the acquisition card 1, the acquisition card 2, the acquisition card 3 and the acquisition card 4, thereby triggering the macro camera A to perform image acquisition.

[0220] In one embodiment, there is a third distance d3 between the second type acquisition device and the acquisition surface c, and the acquisition surface c is the side of the pole piece facing the first type acquisition device. In other words, using the second type acquisition device for image acquisition can reduce the third distance d3 between the second type acquisition device and the acquisition surface, saving space.

[0221] In a specific embodiment, the visual inspection system 90 also includes a manufacturing execution system (MES), a main device (PLC), an 8-port switch, a three-color light, a main device of a CCD, a camera fan, a cabinet fan, a 5-port switch, a card reader, and a KVM transmitter. The main device (PLC) is connected to the network port 2 of the main processing device through the 8-port switch. The camera fan, the cabinet fan and the three-color light are connected to the main device of the CCD, and the main device of the CCD is connected to the network port 2 of the main processing device through the 8-port switch; the camera fan is used to dissipate heat for the camera, which can be 1, 2, 3, etc.; the cabinet fan is used to dissipate heat for the camera cabinet, which can be 1, 2, 3 or more; the three-color light is used to flash when the pole piece is abnormal, so as to promptly inform the relevant personnel of the abnormal situation of the pole piece. The slave processing device is connected to the network port 2 of the main processing device through the 8-port switch. The light source module corresponding to the main processing device is connected to the network port 1 of the main processing device through its light source controller 1. The manufacturing execution system (MES) is connected to the network port 1 of the main processing device. The monitoring device 193 is connected to a 5-port switch, and the 5-port switch is connected to a VGA port of the main processing device through a KVM transmitter. The card reader is connected to a USB port of the main processing device.

[0222] In a specific embodiment, Fig. 20 As shown, the light source module corresponding to the slave processing device 921 is connected to the serial port of the slave processing device 922 through its light source control. The 8-port switch is connected to the network port 1 of the slave processing device 922.

[0223] Please continue reading Figure 6 The present application also provides a coating system 60, the coating system 60 includes an unwinding mechanism 61, a first coating mechanism ( Figure 6 Die head A62), drying mechanism ( Figure 6 The lower oven 63 and the upper oven 65), the second coating mechanism ( Figure 6 The die head B64 in the winding mechanism 66 and the visual inspection system 90, the visual inspection system 90 is used to obtain the coating images collected from the two relative coating surfaces of the electrode piece; the coating misalignment information is determined using the coating images; wherein the coating misalignment information characterizes the misalignment of the coating area on the coating surface; based on the coating misalignment information, the coating mechanisms of the two coating surfaces and at least two of the electrode pieces are corrected, so that after the correction, the coating areas of the two coating surfaces are aligned and are both located at the standard coating position in the coating surface. Among them, the unwinding mechanism 61 is used to unwind the electrode piece; the first coating mechanism ( Figure 6 The die head A62 in the embodiment is used to coat the first coating surface of the unwinding pole piece; the second coating mechanism ( Figure 6 The die head B64 in the coating mechanism is arranged on the first coating mechanism and the second coating mechanism ( Figure 6 After the die head B62 in the coating, it is used to coat the second coating surface of the electrode; the drying mechanism ( Figure 6 The lower oven 63 and the upper oven 65) 43 are used to coat the first coating mechanism ( Figure 6 The die head A62 in the coating device ( Figure 6 The die head B64) is used to dry the electrode after coating; the winding mechanism 66 is used to wind up the dried electrode.

[0224] In one embodiment, the visual inspection system 90 also includes a first image acquisition device and a second image acquisition device, the first image acquisition device and the second image acquisition device are arranged behind the second coating mechanism, and the first image acquisition device is arranged on one side of the first coating surface, and the second image acquisition device is arranged on one side of the second coating surface.

[0225] In one embodiment, the coating system 60 or the visual inspection system 90 further includes a correction mechanism 69 (95), and the correction mechanism 69 (95) is used to correct the coating mechanism of the coating surface of the electrode.

[0226] If the technical solution of this application involves personal information, the product using the technical solution of this application has clearly informed the personal information processing rules and obtained the individual's voluntary consent before processing the personal information. If the technical solution of this application involves sensitive personal information, the product using the technical solution of this application has obtained the individual's separate consent before processing the sensitive personal information, and at the same time meets the "explicit consent" requirement. For example, on personal information collection devices such as cameras, clear and prominent signs are set to inform that the personal information collection scope has been entered and personal information will be collected. If the individual voluntarily enters the collection scope, it is deemed that he or she agrees to the collection of his or her personal information; or on the device that processes personal information, the personal information processing rules are notified by obvious signs / information, and the individual's authorization is obtained through pop-up information or by asking the individual to upload his or her personal information; among them, the personal information processing rules may include information such as the personal information processor, the purpose of personal information processing, the processing method, and the type of personal information processed.

[0227] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A pole piece detection method, It is characterized in that include: Acquire the image to be detected acquired from the pole piece; Determine at least one edge-grabbing area in the image to be detected according to preset edge-grabbing area information, wherein the preset edge-grabbing area information includes position information and / or size information of the edge-grabbing area; Performing boundary detection on each of the edge-grabbing areas to obtain a first boundary line in each of the edge-grabbing areas, wherein the first boundary line is used to divide different partitions of the arrangement of the pole pieces in the width direction; The width information related to the pole piece is determined by using the first boundary line in each of the edge grasping areas.

2. The method according to claim 1, It is characterized in that The step of determining at least one edge-grabbing area in the image to be detected according to the preset edge-grabbing area information includes: When the electrode piece is an anode electrode piece, at least four edge-grabbing areas are determined in the image to be detected according to the preset edge-grabbing area information; or, when the electrode piece is a cathode electrode piece, at least six edge-grabbing areas are determined in the image to be detected according to the preset edge-grabbing area information.

3. The method according to claim 2, It is characterized in that The boundary detection of each edge-grabbing area is performed by multiple threads, and the boundary detection of each edge-grabbing area is performed by using one of the threads.

4. The method according to any one of claims 1 to 3, It is characterized in that Before determining at least one edge-grabbing area in the image to be detected according to the preset edge-grabbing area information, the method further includes: Acquire a sample image acquired from a pole piece; capturing a plurality of second boundary lines in the sample image; The information of the edge-grabbing areas respectively corresponding to the second boundary lines is acquired by using the second boundary lines to obtain the preset edge-grabbing area information.

5. The method according to claim 4, It is characterized in that The capturing of a plurality of second boundary lines in the sample image comprises: Determining a boundary detection area of ​​the sample image according to the area setting information; Grab a plurality of the second boundary lines from the boundary detection area; And / or, using each of the second boundary lines to obtain information of the edge-grabbing areas respectively corresponding to each of the second boundary lines to obtain the preset edge-grabbing area information includes at least one of the following steps: For each second boundary line, acquiring position information of a first preset position point of the second boundary line as position information of a second preset position point in the edge grasping area corresponding to the second boundary line; The size information of the edge grabbing area corresponding to the second boundary line is obtained.

6. The method according to any one of claims 1 to 5, It is characterized in that The performing boundary detection on each of the edge-grabbing areas to obtain a first boundary line in each of the edge-grabbing areas includes: For each edge grabbing area, using the grayscale change in the edge grabbing area, a number of boundary points are found, and the grayscale change between the boundary point and the adjacent pixel point meets the boundary grayscale change requirement; A plurality of boundary points in the edge grabbing area are used to perform straight line fitting to obtain a first boundary line in the edge grabbing area.

7. The method according to any one of claims 1 to 6, It is characterized in that The determining of width information related to the pole piece by using the first boundary line in each of the edge grasping areas includes: Determine the partitions to be divided by each of the first boundary lines; The distance between the two first boundary lines corresponding to each target partition is obtained as the width information of each target partition, wherein the target partition is any partition on the pole piece, or a plurality of consecutive adjacent partitions are spliced ​​together.

8. The method according to claim 7, It is characterized in that The determining of the partitions for dividing the first boundary lines includes: Determining the partitions for dividing each first boundary line according to the grayscale information on both sides of each first boundary line; Extracting boundary line partitioning information of each of the edge grabbing areas from the preset edge grabbing area information, the boundary line partitioning information including a partition identifier, a partition name or a partition sorting information of a partition divided by the first boundary line in the edge grabbing area, the partition sorting information indicating the sorting of the partition divided by the first boundary line among a plurality of partitions in the width direction of the pole piece; and, utilizing the boundary line partitioning information of each of the edge grabbing areas, determining the partition divided by the first boundary line in each of the edge grabbing areas.

9. The method according to any one of claims 1 to 8, It is characterized in that The width information includes coating-related width information capable of characterizing the position and / or width of the coating areas of the two coating surfaces of the pole piece; After determining the width information related to the pole piece by using the first boundary line in each of the edge grasping areas, the method further includes: Determine coating misalignment information using the coating-related width information, wherein the coating misalignment information represents the misalignment condition of the coating area; Based on the coating misalignment information, a correction mechanism is used to correct the coating mechanisms of the two coating surfaces and at least one of the pole pieces, so that after the correction, the coating areas of the two coating surfaces are aligned and / or are both located at the standard coating positions in the coating surfaces.

10. The method according to any one of claims 1 to 9, It is characterized in that Said also includes: Determine a quality detection area in the image to be detected, wherein the quality detection area includes one or more partitions in the width direction of the pole piece; Performing quality inspection on the quality inspection area to obtain a quality inspection result of the quality inspection area.

11. The method according to claim 10, It is characterized in that The grayscale value of each partition of the pole piece in the acquired image belongs to a different grayscale interval; The determining of the quality detection area in the image to be detected includes: Finding the first pixel point whose grayscale value belongs to the target grayscale interval from the image to be detected; Acquire a connected domain formed by the first pixel points as the quality detection area; And / or, performing quality inspection on the quality inspection area to obtain a quality inspection result of the quality inspection area includes: The grayscale distribution in the quality detection area is used to determine whether there is a defect in the quality detection area.

12. The method according to claim 11, It is characterized in that The quality inspection area includes a ceramic partition and a coating partition, and the defect includes metal leakage in the ceramic partition or the coating partition; and / or, Determining whether there is a defect in the quality inspection area by using the grayscale distribution in the quality inspection area includes: Finding a number of second pixel points whose grayscale values ​​do not belong to the target grayscale interval from the quality detection area; Determine at least one suspected defect area using the plurality of second pixel points; In response to the suspected defect area meeting a preset size requirement, it is determined that the defect exists in the suspected defect area, wherein the preset size requirement includes at least one of an area meeting a preset area condition and a width meeting a preset width condition.

13. The method according to any one of claims 1 to 12, It is characterized in that The step of acquiring the image to be detected obtained by collecting the electrode piece includes: Acquire at least two initial images of the pole piece acquired by at least two image acquisition devices corresponding to the same acquisition time, wherein the plurality of image acquisition devices are arranged along the width direction of the pole piece; determining an overlapping area in the at least two initial images; Removing an overlapping area of ​​the at least two initial images, and splicing the at least two initial images after the removal to obtain the image to be detected; And / or, before determining at least one edge-grabbing area in the image to be detected according to the preset edge-grabbing area information, the method further includes: In response to the image to be detected being an abnormal image, discarding the image to be detected; And / or, the image to be detected is obtained by stitching at least two initial images acquired by at least two image acquisition devices at the same acquisition time. Before acquiring the image to be detected acquired by the polar piece, the method further includes: In response to the presence of an abnormal image in the at least two initial images, the at least two initial images are discarded.

14. A visual inspection system, It is characterized in that include: at least one image acquisition device for acquiring an image of the pole piece; a processing device, communicatively connected to the at least one image acquisition device, and configured to detect the pole piece using the image acquired by the at least one image acquisition device to obtain a detection result of the pole piece, wherein the detection result includes width information related to the pole piece, and the width information is determined using a first boundary line detected in at least one edge grabbing area of ​​the image; The host computer is connected to the processing device for displaying the image acquired by the image acquisition device and / or prompting the detection result.

15. The system according to claim 14, It is characterized in that The image acquisition device is a first-class acquisition device, and the system further comprises a light source for providing shooting light for the first-class acquisition device, the light source and the first-class acquisition device are respectively located on both sides of a target normal line, and the target normal line is a normal line of a tangent line between the pole piece and a roller for conveying the pole piece; wherein, There is a first distance between the intersection of the optical axis of the first type of collection device and the collection surface and the target tangent point, the collection surface is the side of the pole piece facing the first type of collection device, the target tangent point is the tangent point between the pole piece and the roller used to transport the pole piece, and the first distance can make the incident amount of the reflected light of the light source from the roller incident on the first type of collection device lower than a preset threshold; and / or, The second distance between the first type of acquisition device and the acquisition surface is related to the focal length of the first type of acquisition device; and / or, There is a first angle between the irradiated light of the light source and the target normal, there is a second angle between the optical axis of the first type of acquisition device and the target normal, and the size of at least one of the first angle and the second angle can make the illumination intensity of the shooting area of ​​the first type of acquisition device meet the requirements; and / or, There is a third distance between the light source and the collection surface.

16. The system according to claim 14, It is characterized in that The image acquisition device is a second type of acquisition device, the second type of acquisition device is connected to a plurality of acquisition cards corresponding to the second type of acquisition device, and the plurality of acquisition cards corresponding to the second type of acquisition device is connected to the processing device; Among them, multiple acquisition cards corresponding to the second type of acquisition device are connected through an inter-board synchronization line, and the encoder of the system transmits an acquisition trigger signal to one of the acquisition cards, and one of the acquisition cards is synchronized with the remaining acquisition cards corresponding to the second type of acquisition device through the inter-board synchronization line to trigger the second type of acquisition device to perform image acquisition.

17. The system according to claim 14, It is characterized in that The image acquisition device is a second type of acquisition device, the second type of acquisition device is connected to a plurality of acquisition cards corresponding to the second type of acquisition device, and the plurality of acquisition cards corresponding to the second type of acquisition device is connected to the processing device; The system further comprises a signal distributor connected to the encoder, and the acquisition trigger signal sent by the encoder outputs multiple acquisition trigger signals through the signal distributor to be transmitted to each acquisition card respectively to trigger the second type acquisition device to perform image acquisition.

18. The system according to claim 17, It is characterized in that The second type of acquisition device is a macro camera; And / or, there is a third distance between the second type of collecting device and a collecting surface, and the collecting surface is a side of the pole piece facing the first type of collecting device.

19. A system according to any one of claims 14 to 18, It is characterized in that The at least one image acquisition device includes at least one device group, each device group includes at least one image acquisition device, and different device groups are used to acquire images on different surfaces of the pole piece.

20. The system according to claim 19, It is characterized in that The at least one device group includes a first device group and a second device group, and the processing device includes a master processing device and a slave processing device; The main processing device is connected to the first device group, and is used to detect the image collected by the first device group to obtain a first detection result; the slave processing device is connected to the second device group, and is used to detect the image collected by the second device group to obtain a second detection result, and send at least one of the image collected by the second device group and the second detection result to the main processing device; The main processing device is connected to the monitoring equipment, and is also used to send the images collected by the first device group and the second device group to the monitoring equipment, and / or prompt the first detection result and the second detection result.

21. The system according to claim 20, It is characterized in that The image acquisition device is a first type of acquisition device, and the system further comprises two light source modules, each of which comprises a light source and a light source controller connected to each other, and the light source controllers of the two light source modules are respectively connected to the main processing device and the slave processing device, so that the correspondingly connected processing device instructs the light source controller to control the corresponding light source to work; And / or, the master processing device and the slave processing device are connected via a network.

22. A system according to any one of claims 14 to 21, It is characterized in that The host computer includes at least one, and the at least one host computer is arranged at a preset position of a coating system for coating the electrode piece.

23. A coating system, It is characterized in that The coating system comprises: An unwinding mechanism, used for unwinding the pole piece strip; A first coating mechanism, used for coating the first coating surface of the unwound electrode sheet strip; A second coating mechanism, disposed after the first coating mechanism, for coating the second coating surface of the electrode strip; A drying mechanism, used for drying the electrode material strip after being coated by the first coating mechanism and the second coating mechanism; A winding mechanism, used for winding the pole piece strip that has been dried; A visual inspection system, the visual inspection system comprising at least one image acquisition device and a processing device, the image acquisition device being used to acquire images of a pole piece to obtain an image to be inspected; the processing device being used to determine at least one edge-grabbing area in the image to be inspected according to preset edge-grabbing area information, the preset edge-grabbing area information comprising position information and / or size information of the edge-grabbing area; performing boundary detection on each of the edge-grabbing areas to obtain a first boundary line in each of the edge-grabbing areas, the first boundary line being used to divide different partitions of the arrangement of the pole piece in the width direction; and determining width information related to the pole piece using the first boundary line in each of the edge-grabbing areas.

24. The system according to claim 23, It is characterized in that The visual inspection system also includes a first image acquisition device and a second image acquisition device, wherein the first image acquisition device and the second image acquisition device are arranged behind the second coating mechanism, and the first image acquisition device is arranged on one side of the first coating surface, and the second image acquisition device is arranged on one side of the second coating surface.

25. The system according to claim 23, It is characterized in that It also includes a deviation correction mechanism, which is used to correct the coating mechanism of the coating surface of the pole piece.

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