Pole piece detection system and pole piece detection method

Abstract

The invention provides a pole piece detection system and a pole piece detection method, the pole piece detection system comprises a passing roller, an image acquisition part and a controller, and the passing roller is used for conveying a pole piece to be detected; a feature identifier is arranged on the passing roller; the image acquisition part is used for performing image acquisition on the to-be-detected pole piece and the feature identifier on the passing roller to determine a first image; the detection mechanism is in communication connection with the image acquisition part and the passing roller, and is used for identifying the first image to determine the detection information of the to-be-detected pole piece and the feature identifier; and determining a size detection result of the to-be-detected pole piece based on the detection information of the to-be-detected pole piece and the feature identifier. The feature identifier is arranged on the passing roller to identify the first image to determine the to-be-detected pole piece and the detection information of the feature identifier, and the size detection result of the to-be-detected pole piece is determined according to the to-be-detected pole piece and the detection information of the feature identifier, so that size detection of the to-be-detected pole piece in a high-speed transmission scene is conveniently realized; and the detection efficiency and the accuracy of detection results are improved.

Description

Technical Field

[0001] This application relates to the field of electrode detection technology, and in particular to an electrode detection system and method. Background Technology

[0002] In the battery manufacturing process, stringent quality control measures are required to ensure battery quality and safety. Defective batteries entering the market can have very serious consequences. The electrode design within a battery is crucial to its yield rate and performance.

[0003] In the manufacturing process of electrode sheets, manual sampling is usually used to inspect the electrode sheets, which not only cannot guarantee efficiency, but also results in a high defect rate. Summary of the Invention

[0004] The main technical problem addressed by this application is to provide an electrode detection system and method that can detect electrodes, thereby improving detection efficiency and accuracy.

[0005] In a first aspect, this application provides an electrode detection system, which includes: The transfer roller is used to transport the electrode sheet to be tested; the transfer roller is equipped with characteristic markings. An image acquisition unit is used to acquire images of the electrode sheet to be inspected and the feature markings on the roller to determine the first image; The controller, which communicates with the image acquisition unit and the roller, is used to identify the first image and determine the detection information of the electrode to be detected and the feature mark; based on the detection information, it determines the size detection result of the electrode to be detected.

[0006] In the technical solution of this application embodiment, feature marks are set on the roller to facilitate the identification of the first image to determine the detection information of the electrode to be detected and the feature marks. The size detection result of the electrode to be detected is determined based on the detection information of the electrode to be detected and the feature marks, which facilitates the size detection of the electrode to be detected in high-speed transmission scenarios, improves detection efficiency and the accuracy of detection results.

[0007] In some embodiments, the feature marking includes at least two marking lines, which are spaced apart in the circumferential direction of the roller, and the electrode to be tested is located between the two marking lines; The detection information for the electrode to be detected and the feature marking is determined, including: the controller is configured to recognize the first image and determine the position information of the electrode to be detected and the position information of the marking line; Determining the size detection result of the electrode to be tested includes: the controller is configured to determine the size data of the electrode to be tested in a first direction based on the position information of the electrode to be tested and the position information of the marking line, wherein the first direction is perpendicular to the transmission direction of the electrode to be tested.

[0008] In the technical solution of this application embodiment, the pixel distance of the electrode to be detected in the first direction is determined by the position information of the electrode to be detected and the position information of the marker line in the first image, and the width data of the electrode to be detected is determined according to the pixel distance of the electrode to be detected in the first direction and the pixel equivalent, thereby improving detection efficiency and detection accuracy.

[0009] In some embodiments, the feature identifier includes a scale, which is arranged circumferentially along the roller, and the scale lines in the scale are evenly spaced; the scale has a reference line; Determining the detection information of the electrode to be detected and the feature identifier includes: the controller is configured to identify the first image and determine the scale lines in the first image; Determining the size detection result of the electrode to be tested includes: the controller is configured to determine the size data of the electrode to be tested in a second direction based on the scale lines and reference lines in the first image, where the second direction is the transmission direction of the electrode to be tested.

[0010] In the technical solution of this application embodiment, a stitched image is obtained by stitching the first image at the current moment with the first image at a historical moment. The position information of the scale line in the stitched image is identified to determine the pixel distance of the electrode to be detected in the second direction at the current moment. The length data of the electrode to be detected is determined based on the pixel distance of the electrode to be detected in the second direction and the pixel equivalent, thereby improving detection efficiency and detection accuracy.

[0011] In some embodiments, there are multiple scales, including a first scale and a second scale. The first scale and the second scale are spaced apart. The spacing between adjacent scale lines in the first scale is different from the spacing between adjacent scale lines in the second scale, and / or the scale lines in the first scale and the scale lines in the second scale are misaligned.

[0012] In the technical solution of this application embodiment, by setting a first scale and a second scale on the roller, the length information of the same electrode to be tested can be detected simultaneously by the first scale and the second scale, thereby improving the accuracy of the length data of the electrode to be tested, and improving the detection efficiency and detection accuracy.

[0013] In some embodiments, the electrode inspection system further includes a die-cutting mechanism and an inspection mechanism, both of which are connected to a controller. The die-cutting mechanism and the inspection mechanism are spaced apart, with the inspection mechanism located downstream of the die-cutting mechanism. The die-cutting mechanism is used to die-cut the edges of the electrode sheet to be tested to form electrode tabs; The testing agency uses it to identify defect markings on the electrode sheet to be tested; In response to the die-cutting mechanism cutting out marking holes on the electrode to be inspected, the controller records pulse signals; in response to the inspection mechanism detecting defect markings on the electrode to be inspected, the controller stops recording pulse signals. The controller is used to determine the detection distance in the second direction between the defect mark and the marker hole based on the statistical number of pulse signals and the physical distance between the detection mechanism and the die-cutting mechanism.

[0014] In the technical solution of this application embodiment, the controller determines the detection distance between the defect mark and the mark hole based on the number of statistical pulse signals and the physical distance between the detection mechanism and the die-cutting mechanism, thereby improving detection efficiency and detection accuracy.

[0015] Secondly, this application provides an electrode detection method applicable to the electrode detection system of the first aspect, the electrode detection method comprising: During the process of the electrode sheet to be tested passing through the roller, the first image of the electrode sheet to be tested on the roller at the current moment is acquired; The first image is identified to determine the detection information of the electrode to be detected and the feature identifier; Based on the detection information of the electrode to be tested and the feature identification, the size detection result of the electrode to be tested is determined.

[0016] In the technical solution of this application embodiment, a first image containing the electrode to be tested and feature identifiers is acquired during the process of the electrode to be tested passing through the roller. The size detection result of the electrode to be tested is determined based on the detection information of the electrode to be tested and feature identifiers in the first image, thereby realizing the size detection of the electrode to be tested in a high-speed transmission scenario, improving detection efficiency and the accuracy of detection results.

[0017] In some embodiments, the feature identifier includes at least two identifier lines, which are spaced apart in the circumferential direction of the roller, and the electrode to be tested is located between the two identifier lines; the size detection result includes width data; the width data represents the size data of the electrode to be tested in a first direction, which is a direction perpendicular to the transmission direction of the electrode to be tested; The first image is identified to determine the detection information of the electrode to be detected and the feature identifier, including: The first image is identified to determine the position information of the electrode to be detected and the position information of the marking line; Based on the detection information of the electrode to be tested and its feature identifiers, the size detection results of the electrode to be tested are determined, including: Based on the position information of the electrode to be tested and the position information of the marking line, the width data of the electrode to be tested at the current moment is determined.

[0018] In the technical solution of this application embodiment, the width data of the electrode to be detected is determined by identifying the position information of the electrode to be detected and the position information of the marking line in the first image, thereby improving the detection efficiency and detection accuracy.

[0019] In some embodiments, the feature identifier includes a scale arranged circumferentially along the roller, with the scale lines in the scale evenly spaced; the electrode to be tested has an identifier position; the scale has a reference line; the test result includes length data; the length data represents the size data of the electrode to be tested in a second direction, the second direction being the transmission direction of the electrode to be tested; The first image is identified to determine the detection information of the electrode to be detected and the feature identifier, including: Based on the first image, determine the scale line corresponding to the marked position of the electrode to be detected and the scale line corresponding to the current time; the scale line corresponding to the marked position is used as the baseline. Based on the detection information of the electrode to be tested and its feature identifiers, the size detection results of the electrode to be tested are determined, including: Based on the number of intervals between adjacent scale lines corresponding to the current time and the baseline, the length data of the electrode to be tested at the current time is determined. The length data represents the distance between the electrode and the marked position.

[0020] In the technical solution of this application embodiment, the pixel distance of the electrode to be detected in the second direction at the current time is determined based on the first image at the current time, and the length data of the electrode to be detected is determined according to the pixel distance of the electrode to be detected in the second direction and the pixel equivalent, thereby improving detection efficiency and detection accuracy.

[0021] In some embodiments, based on the first image, determining the scale line corresponding to the marked position of the electrode to be detected and the scale line corresponding to the current time includes: The first image at the current moment is stitched together with the first image at a previous historical moment to determine the stitched image of the electrode to be detected on the roller. The stitched image is identified to determine the scale line corresponding to the marked position of the electrode to be tested and the scale line corresponding to the current time.

[0022] In the technical solution of this application embodiment, a stitched image is obtained by stitching the first image at the current moment with the first image at a historical moment. The position information of the scale line in the stitched image is identified to determine the length data of the electrode to be detected at the current moment, thereby improving the detection accuracy of the length and width data of the electrode to be detected.

[0023] In some embodiments, the length data of the electrode to be tested at the current time is determined based on the number of intervals between adjacent scale lines between the scale line and the baseline at the current time, including: In the stitched image, the number of times the baseline appears between the scale line corresponding to the marked position of the electrode to be detected and the scale line corresponding to the current time is taken as the number of rotations of the roller; The length of the electrode to be tested at the current moment is determined based on the number of intervals between adjacent scale lines between the current scale line and the baseline, the physical distance between adjacent scale lines, the number of rotations of the roller, and the circumference.

[0024] In the technical solution of this application embodiment, the length data of the electrode to be tested at the current moment is determined based on the number of intervals between adjacent scale lines between the scale line and the baseline corresponding to the current moment, the physical distance between adjacent scale lines, the number of rotations corresponding to the roller, and the circumference, thereby improving the detection accuracy of the length data of the electrode to be tested.

[0025] In some embodiments, the electrode detection method further includes: The feature markers on the roller are compared with the feature markers in the first image to determine the pixel equivalent.

[0026] In the technical solution of this application embodiment, the pixel equivalent is determined by calibrating the feature mark on the roller with the feature mark in the first image, which helps to improve the detection efficiency and detection accuracy of the electrode sheet to be detected.

[0027] In some embodiments, calibrating the feature markers on the roller with feature markers in the first image to determine pixel equivalents includes: During the rotation of the roller, multiple image data of the roller are continuously acquired; The continuously acquired image data is sorted and stitched according to the time sequence to obtain a planar unfolded image of the roller; Identify the planar unfolded image of the roller to determine the pixel distance between adjacent scale lines and / or the pixel distance between marker lines; The pixel equivalent is determined based on the pixel distance between adjacent scale lines and the physical distance between adjacent scale lines on the roller, and / or based on the pixel distance between adjacent marker lines and the physical distance between adjacent marker lines on the roller.

[0028] In the technical solution of this application embodiment, a planar unfolded image is obtained by stitching together multiple consecutive image data containing feature identifiers. The pixel distance is determined based on the pixel distance between adjacent scale lines in the planar unfolded image and the physical distance between adjacent scale lines on the roller and / or the pixel distance between the marker lines and the physical distance between the marker lines on the roller. This helps to determine the actual size of the electrode to be detected based on the pixel size in the image, thereby improving detection efficiency and detection accuracy.

[0029] In some embodiments, the electrode testing system further includes a die-cutting mechanism and a testing mechanism, wherein the die-cutting mechanism and the testing mechanism are spaced apart, and the electrode to be tested includes at least one single-cell electrode. The electrode testing method further includes: The number of pulse signals corresponding to the process from the die-cutting mechanism cutting the marking hole on the edge of the single cell electrode to the detection mechanism detecting the defect mark on the single cell electrode is counted. Based on the number of pulse signals and the physical distance between the die-cutting mechanism and the detection mechanism, the detection distance between the defect marker and the mark hole in the second direction in the single-cell electrode sheet is determined.

[0030] In the technical solution of this application embodiment, the detection distance between the defect mark and the mark hole of the single cell electrode is determined by statistically analyzing the number of pulse signals corresponding to the process from the die-cutting mechanism cutting the mark hole on the edge of the single cell electrode to the detection mechanism detecting the defect mark on the single cell electrode, as well as the physical distance between the die-cutting mechanism and the detection mechanism, thereby improving detection efficiency and detection accuracy.

[0031] Thirdly, this application provides a method for detecting electrode sheets, the method comprising: The electrode to be tested is tested using the second electrode testing method to determine the size test results of the electrode to be tested; Based on the size detection results of the electrode to be tested, it is determined whether the electrode to be tested meets the preset requirements.

[0032] In the technical solution of this application embodiment, the appearance inspection of the electrode to be inspected is realized by determining whether the electrode to be inspected meets the preset requirements based on the size detection results of the electrode to be inspected, thereby improving the detection efficiency and detection accuracy.

[0033] In some embodiments, the electrode detection method further includes: Verify the dimensional measurement results of the electrode to be tested to determine whether the dimensional measurement results of the electrode to be tested are valid; Based on the size measurement results of the electrode to be tested, determine whether the electrode to be tested meets the preset requirements, including: If the size detection result of the electrode to be tested is valid, then it is determined whether the electrode to be tested meets the preset requirements based on the size detection result of the electrode to be tested.

[0034] In the technical solution of this application embodiment, the validity of the size detection result of the electrode to be tested is determined by verifying the size detection result of the electrode to be tested, thereby improving the reliability of the size detection result of the electrode to be tested and helping to screen electrodes based on the size detection result of the electrode to be tested.

[0035] In some embodiments, the size detection result of the electrode to be tested includes a stitched image of the electrode to be tested on the roller; The dimensional measurement results of the electrode to be tested are verified to determine whether the dimensional measurement results are valid, including: The scale lines of the spliced ​​image of the electrode sheet to be tested on the roller are identified to determine the number of scale lines and the distance between the scale lines within a preset range; If the number of scale lines or the distance between scale lines within the preset range does not meet the corresponding preset value, the size detection result of the electrode to be tested is determined to be invalid.

[0036] In the technical solution of this application embodiment, by detecting the number of scale lines and the distance between scale lines within a preset range, it is determined whether the counting logic in the image acquisition device and / or detection mechanism is accurate, thereby determining whether the size detection result of the electrode to be detected is valid and reliable.

[0037] In some embodiments, determining whether the electrode to be tested meets preset requirements based on the size detection results of the electrode to be tested includes: If the difference between the size detection result of the electrode to be tested and the preset result does not exceed the threshold, it is determined that the electrode to be tested meets the preset requirements.

[0038] In the technical solution of this application embodiment, the size detection result of the electrode to be tested is verified by comparing it with a preset result, which helps to improve the reliability of the size detection result of the electrode to be tested.

[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic block diagram of an embodiment of the electrode detection system provided in this application; Figure 2 This is a schematic block diagram of a specific embodiment of the electrode detection system provided in this application; Figure 3 This is a schematic diagram of a specific embodiment of the electrode detection system provided in this application; Figure 4 This is a schematic diagram of the cooperation structure between the electrode sheet to be tested and the roller in a specific embodiment provided in this application; Figure 5 This is a schematic diagram of a specific embodiment of the first and second scale rulers provided in this application; Figure 6 This is a schematic diagram of another specific embodiment of the first and second scales provided in this application; Figure 7 This is a schematic diagram of the cooperation structure between the electrode to be tested, the die-cutting mechanism, and the testing mechanism in a specific embodiment provided in this application; Figure 8 This is a schematic flowchart of an embodiment of the electrode detection method provided in this application; Figure 9 This is a flowchart illustrating a specific embodiment of the electrode detection method provided in this application; Figure 10 This is a flowchart illustrating another specific embodiment of the electrode detection method provided in this application; Figure 11 This is a schematic flowchart of another embodiment of the electrode detection method provided in this application; Figure 12 This is a schematic diagram showing an abnormal resolution of the image acquisition component in the stitched image provided in this application; Figure 13 This is a schematic diagram showing a missing line in the image acquisition component of the stitched image provided in this application.

[0042] In the figure: electrode inspection system 100; roller 1; feature mark 11; mark line 111; scale 112; scale line 1121; first scale 1122; second scale 1123; image acquisition device 2; controller 3; encoder counting unit 31; die-cutting mechanism 4; inspection mechanism 5; electrode to be inspected 6; defect mark 61; mark hole 62. Detailed Implementation

[0043] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0046] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0049] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in specialized equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0052] Electrodes are an indispensable part of the battery manufacturing process, directly affecting the overall performance and safety of the battery. Even minor defects or foreign objects in the electrodes can have a serious impact on the battery, or even cause safety issues. Therefore, ensuring the quality of the electrodes is the primary task in battery manufacturing.

[0053] In traditional production methods, battery manufacturers cut electrode sheets to a predetermined size and measure their dimensions on a testing table using a flexible measuring tape. They rely on manual visual inspection to check the surface condition of the electrode sheets to determine if there are any problems, such as the presence of defective labels from the previous process or any other flaws or defects. However, manual inspection is easily affected by employee subjectivity, and can lead to misjudgments due to fatigue, resulting in low inspection efficiency and material waste.

[0054] Based on the above considerations, in order to improve the detection efficiency and accuracy of electrode sheets, this application provides an electrode sheet detection system. The electrode sheet detection system includes a roller, an image acquisition device, and a controller. By setting feature markers on the roller, the detection information of the electrode sheet to be detected and the feature markers can be determined by recognizing the first image. The size detection result of the electrode sheet to be detected can be determined based on the detection information of the electrode sheet to be detected and the feature markers, which facilitates the size detection of the electrode sheet to be detected in high-speed transmission scenarios, thereby improving detection efficiency and the accuracy of detection results.

[0055] Please see Figures 1 to 4 , Figure 1 This is a schematic block diagram of an embodiment of the electrode detection system provided in this application; Figure 2 This is a schematic block diagram of a specific embodiment of the electrode detection system provided in this application; Figure 3This is a schematic diagram of a specific embodiment of the electrode detection system provided in this application; Figure 4 This is a schematic diagram of the cooperation structure between the electrode sheet to be tested and the roller in a specific embodiment provided in this application.

[0056] The electrode inspection system 100 provided in this application is suitable for online inspection and quality control of electrodes during the manufacturing process. Specifically, the electrode inspection system 100 is applied in at least one electrode production process, including coating, rolling, and slitting, to achieve real-time identification and location of electrode defects on the production line.

[0057] The electrode inspection system 100 provided in this application includes a roller 1, an image acquisition unit 2, and a controller 3. The controller 3 is communicatively connected to the image acquisition unit 2 and the roller 1, such as... Figure 1 .

[0058] The roller 1 is used to transport the electrode sheet 6 to be tested; the roller 1 is provided with a feature mark 11, which rotates synchronously with the roller 1.

[0059] Image acquisition unit 2 is positioned opposite to roller 1. Image acquisition unit 2 is used to acquire images of the electrode sheet 6 to be tested and the feature mark 11 on roller 1 to determine the first image. Image acquisition unit 2 continuously acquires images of the electrode sheet 6 to be tested on roller 1 at preset time intervals to determine multiple first images.

[0060] The controller 3 is used to identify the first image to determine the detection information of the electrode to be detected 6 and the feature identifier 11; based on the detection information of the electrode to be detected 6 and the feature identifier 11, the detection result of the electrode to be detected 6 is determined.

[0061] In the technical solution of this application embodiment, by setting a feature mark 11 on the roller 1, the detection information of the electrode to be detected 6 and the feature mark 11 can be determined by recognizing the first image. The detection result of the electrode to be detected 6 can be determined according to the detection information of the electrode to be detected 6 and the feature mark 11. This facilitates the size detection of the electrode to be detected 6 in high-speed transmission scenarios, improves detection efficiency and the accuracy of detection results.

[0062] In this embodiment, the image acquisition device 2 can be a line scan camera that captures only one line image at a time.

[0063] The feature identifier 11 may include only two identifier lines 111, or only a scale 112, or it may include both at least two identifier lines 111 and at least one scale 112. Figure 4 The feature markings 11 on the roller 1 can be formed by laser etching, or by plating or attaching a layer to the roller 1.

[0064] In some embodiments, the cross-sectional shape of the roller 1 in the circumferential direction can be circular, elliptical, or the like. The following embodiments will use a circular cross-sectional shape for the roller 1 in the circumferential direction.

[0065] In some embodiments, the guide roller 1 may be located before and / or after the electrode tab die-cutting position. Specifically, the guide roller 1 may also be located before and / or after the electrode sheet slitting position, depending on the actual situation.

[0066] In some embodiments, the feature identifier 11 includes at least two identifier lines 111, which are spaced apart circumferentially on the roller 1, and the electrode sheet 6 to be tested is located between the two identifier lines 111. The following embodiments use the feature identifier 11 including two identifier lines 111 as an example for description. Figure 4 .

[0067] During the transfer of the electrode sheet 6 to be inspected by the roller 1, the image acquisition unit 2 continuously acquires images of the electrode sheet 6 located between the two marking lines 111 to determine multiple first images. These multiple first images are acquired at different times. Each first image contains the electrode sheet 6 to be inspected and the marking lines 111.

[0068] In one embodiment, determining the detection information of the electrode to be detected 6 and the feature identifier 11 includes: the controller 3 is configured to identify the first image at the current moment and determine the position information of the electrode to be detected 6 and the position information of the identifier line 111.

[0069] The determination of the size detection result of the electrode 6 to be tested includes: the controller 3 is configured to determine the size data of the electrode 6 to be tested in a first direction based on the position information of the electrode 6 to be tested and the position information of the marker line 111. The first direction is a direction perpendicular to the transmission direction of the electrode 6 to be tested. The size data of the electrode 6 to be tested in the first direction is the width data of the electrode 6 to be tested at the current moment.

[0070] In one specific embodiment, determining the detection information of the electrode to be detected 6 and the feature identifier 11 includes: the controller 3 is configured to stitch together the first image at the current moment and the first image at a previous historical moment to obtain a stitched image; and to determine the position information of the two side edges of the electrode to be detected 6 and the position information of the identifier line 111 by recognizing the stitched image. The two side edges of the electrode to be detected 6 are in close contact with the surface of the roller 1.

[0071] The determination of the size detection result of the electrode sheet 6 to be inspected includes: the controller 3 is configured to calculate and determine the width data of the electrode sheet 6 to be inspected based on the position information corresponding to the two side edges of the electrode sheet 6 to be inspected in the stitched image, the position information of the marker line 111, and the physical distance between the two marker lines 111 on the roller 1. The width data of the electrode sheet 6 to be inspected is the physical distance between the two side edges of the electrode sheet 6 to be inspected. Among them, the position information of the two side edges of the electrode sheet 6 to be inspected and the position information of the marker line 111 are the axial coordinates on the roller 1.

[0072] In the technical solution of this application embodiment, the pixel distance of the electrode to be detected 6 in the first direction is determined by the position information of the electrode to be detected 6 and the position information of the marker line 111 in the first image, and the width data of the electrode to be detected 6 is determined according to the pixel distance of the electrode to be detected 6 in the first direction and the pixel equivalent, thereby improving the detection efficiency and detection accuracy.

[0073] In some embodiments, the feature identifier 11 includes at least one scale 112, which is arranged circumferentially along the roller 1, and the scale lines 1121 in the scale 112 are evenly spaced; the scale 112 is spaced apart from the electrode sheet 6 to be tested, and the scale 112 has a reference line, such as... Figure 4 In other words, the multiple scale lines 1121 arranged circumferentially on the roller 1 are equally spaced. The more scale lines 1121 on the roller 1, the higher the measurement accuracy of the scale 112. In one embodiment, the "0" scale line 1121 in the scale 112 can be the baseline in the scale 112.

[0074] The electrode to be tested 6 includes a starting end and a ending end. The starting end of the electrode to be tested 6 can be used as the marking position of the electrode to be tested 6. The electrode to be tested 6 is transferred by the roller 1, and the length information between the starting end and the ending end of the electrode to be tested 6 is determined by the scale line 1121 on the scale 112 of the starting end and the scale line 1121 of the ending end of the electrode to be tested 6.

[0075] In one embodiment, determining the detection information of the electrode to be detected 6 and the feature identifier 11 includes: the controller 3 is configured to identify the first image and determine the scale line 1121 in the first image; and determine the length data of the electrode to be detected 6 based on the scale line 1121 and the baseline in the first image.

[0076] The determination of the size detection result of the electrode 6 to be tested includes: the controller 3 is configured to determine the length data of the electrode 6 to be tested based on the number of intervals between the scale line 1121 corresponding to the starting end of the electrode 6 to be tested in the stitched image and the scale line 1121 in the first image at the current time, and the physical distance between adjacent scale lines 1121 on the roller 1. The length data of the electrode 6 to be tested at the current time is the physical distance from the starting end of the electrode 6 to the location of the electrode 6 to be tested in the first image at the current time.

[0077] In some specific embodiments, determining the detection information of the electrode to be detected 6 and the feature identifier 11 includes: the controller 3 is configured to stitch together the first image at the current moment and the first image at a previous historical moment to obtain a stitched image; and to identify the scale line 1121 on the scale 1121 of the starting end of the electrode to be detected 6 and the scale line 1121 in the first image at the current moment by recognizing the stitched image. The scale line 1121 on the scale 1121 of the starting end of the electrode to be detected 6 serves as a reference line.

[0078] The determination of the size detection result of the electrode 6 to be tested includes: the controller 3 is configured to count the number of scale lines 1121 at the starting end of the electrode 6 to be tested in the stitched image and the number of reference lines between the scale lines 1121 of the electrode 6 to be tested in the first image at the current time as the number of rotations of the roller 1; and to count the number of minimum intervals between the scale lines 1121 and the reference lines in the first image at the current time; and to determine the physical distance from the starting end of the electrode 6 to the location of the electrode 6 to be tested in the first image at the current time based on the product of the circumference of the roller 1 and the number of rotations of the roller 1 and the product of the number of minimum intervals and the physical distance between adjacent scale lines 1121 on the roller 1.

[0079] In one embodiment, the circumference of the roller 1 can be determined by measuring the physical diameter of the roller 1 in three dimensions and calculating the circumference of the roller 1 based on the physical diameter of the roller 1.

[0080] In one embodiment, the controller 3 is used to determine the pixel equivalent of the image acquisition unit 2 based on the pixel distance between adjacent scale lines 1121 in the stitched image and the physical distance between adjacent scale lines 1121 on the roller 1.

[0081] In one embodiment, during the continuous rotation of the roller 1, the image acquisition unit 2 is used to continuously acquire multiple image data of the roller 1.

[0082] The controller 3 is used to sort and stitch the continuously acquired image data according to the time sequence to obtain the planar unfolded image of the roller 1; the controller 3 is also used to identify the planar unfolded image of the roller 1, determine the pixel distance between adjacent scale lines 1121 and / or the pixel distance between marker lines 111; determine the pixel equivalent based on the pixel distance between adjacent scale lines 1121 and the physical distance between adjacent scale lines 1121 on the roller 1, and / or based on the pixel distance between adjacent marker lines 111 and the physical distance between adjacent marker lines 111 on the roller 1, so as to improve the accuracy of the pixel equivalent.

[0083] In one embodiment, when the edge of the electrode to be detected 6 has tabs, the controller 3 is further configured to detect the pixel distance between adjacent tabs in the stitched image, so as to determine the physical distance between adjacent tabs based on the pixel distance between adjacent tabs and the pixel equivalent.

[0084] In the technical solution of this application embodiment, a stitched image is obtained by stitching the first image at the current moment with the first image at a historical moment. The position information of the scale line 1121 in the stitched image is identified to determine the pixel distance of the electrode to be detected 6 in the second direction at the current moment. The length data of the electrode to be detected 6 is determined according to the pixel distance of the electrode to be detected 6 in the second direction and the pixel equivalent, thereby improving detection efficiency and detection accuracy.

[0085] Please see Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of a specific embodiment of the first and second scale rulers provided in this application; Figure 6 This is a schematic diagram of another specific embodiment of the first and second scales provided in this application.

[0086] In some embodiments, at least one scale 112 includes a first scale 1122 and a second scale 1123, which are spaced apart. The spacing between adjacent scale lines 1121 in the first scale 1122 and the spacing between adjacent scale lines 1121 in the second scale 1123 can be the same or different. For example, the spacing between adjacent scale lines 1121 in the first scale 1122 and the spacing between adjacent scale lines 1121 in the second scale 1123 are both 0.4 mm. Figure 5 The interval between adjacent graduation lines 1121 in the first scale 1122 can be 0.2mm, and the interval between adjacent graduation lines 1121 in the second scale 1123 can be 0.4mm. Figure 6 .

[0087] The graduation lines 1121 in the second scale 1123 can be offset from the graduation lines 1121 in the first scale 1122. For example, the graduation lines 1121 in the second scale 1123 can be located on the axis of symmetry between adjacent graduation lines 1121 in the first scale 1122. Alternatively, the graduation lines 1121 in the second scale 1123 can be aligned with the graduation lines 1121 in the first scale 1122.

[0088] In the technical solution of this application embodiment, by setting a first scale 1122 and a second scale 1123 on the roller 1, the length information of the same electrode 6 to be tested is detected simultaneously by the first scale 1122 and the second scale 1123, thereby improving the accuracy of the length data of the electrode 6 to be tested, and improving the detection efficiency and detection accuracy.

[0089] Please see Figure 2 and Figure 7 , Figure 7 This is a schematic diagram of the cooperation structure between the electrode to be tested, the die-cutting mechanism, and the testing mechanism in a specific embodiment provided in this application.

[0090] In some embodiments, the electrode testing system 100 further includes a die-cutting mechanism 4 and a testing mechanism 5, which are spaced apart and the testing mechanism 5 is located downstream of the die-cutting mechanism 4; the die-cutting mechanism 4 and the testing mechanism 5 are connected to the controller 3.

[0091] The die-cutting mechanism 4 is used to die-cut the edge of the electrode sheet 6 to be tested to form an electrode tab.

[0092] The inspection mechanism 5 is used to identify the defect markings 61 on the electrode sheet 6 to be inspected. For example, the inspection mechanism 5 can be a yellow-mark sensor, and the defect markings 61 can be yellow marks.

[0093] In response to the die-cutting mechanism 4 die-cutting a mark hole 62 on the electrode sheet 6 to be inspected, the controller 3 starts recording pulse signals; in response to the detection mechanism 5 detecting a defect mark 61 on the electrode sheet 6 to be inspected, the controller 3 stops recording pulse signals. The mark hole 62 can be a Mark hole.

[0094] The controller 3 is also used to determine the detection distance in the second direction between the defect mark 61 and the marker hole 62 based on the statistical number of pulse signals and the distance between the detection mechanism 5 and the die-cutting mechanism 4. The time difference between the pulse signals is consistent. The physical distance between the detection mechanism 5 and the die-cutting mechanism 4 is D, and the detection distance between the defect mark 61 and the marker hole 62 is H.

[0095] In one specific embodiment, the controller 3 includes an encoder counting unit 31, which is used to count the number of pulse signals. Specifically, when the die-cutting mechanism 4 cuts the marking hole 62 on the electrode sheet 6 to be inspected, the encoder counting unit 31 is controlled to start recording pulse signals; when the inspection mechanism 5 detects the defect marking 61 on the electrode sheet 6 to be inspected, the encoder counting unit 31 is controlled to stop recording pulse signals.

[0096] In some specific embodiments, the controller 3 is also used to calculate the detection distance between the defect marker 61 and the mark hole 62 based on the difference between the product of the statistically calculated number of pulse signals and the unit length equivalent of the pulse signals and the physical distance between the detection mechanism 5 and the die-cutting mechanism 4. Here, the unit length equivalent of the pulse signal represents the transmission length of the electrode to be detected between adjacent pulse signals.

[0097] The electrode inspection system 100 provided in this application can perform full inspection on the electrode sheets 6 to be inspected that are conveyed by the roller 1, thereby improving the inspection accuracy and efficiency.

[0098] Specifically, controller 3 can be a terminal or a small server, etc.

[0099] In the technical solution of this application embodiment, the detection distance between the defect mark 61 and the mark hole 62 is determined by statistically analyzing the number of pulse signals and the physical distance between the detection mechanism 5 and the die-cutting mechanism 4, thereby improving detection efficiency and accuracy.

[0100] Please see Figure 8 , Figure 8 This is a schematic flowchart of an embodiment of the electrode detection method provided in this application.

[0101] This application provides an electrode detection method applicable to the electrode detection system 100 described above. The electrode detection method includes the following steps.

[0102] S11: During the process of the electrode sheet to be tested passing through the roller, acquire the first image of the electrode sheet to be tested on the roller at the current moment.

[0103] S12: Recognize the first image to determine the detection information of the electrode to be detected and the feature identifier.

[0104] S13: Based on the detection information of the electrode to be tested and the feature identification, determine the size detection result of the electrode to be tested.

[0105] In the technical solution of this application embodiment, a first image containing the electrode to be tested and feature identifiers is acquired during the process of the electrode to be tested passing through the roller. The size detection result of the electrode to be tested is determined based on the detection information of the electrode to be tested and feature identifiers in the first image, thereby realizing the size detection of the electrode to be tested in a high-speed transmission scenario, improving detection efficiency and the accuracy of detection results.

[0106] In one embodiment, the circumference of the roller can be determined by measuring the physical diameter of the roller in three dimensions, and the actual circumference of the roller can be calculated based on the physical diameter of the roller.

[0107] In some embodiments, the electrode detection method further includes: calibrating the feature markers on the roller with the feature markers in the first image to determine the pixel equivalent.

[0108] In the technical solution of this application embodiment, the pixel equivalent is determined by calibrating the feature mark on the roller with the feature mark in the first image, which helps to improve the detection efficiency and detection accuracy of the electrode sheet to be detected.

[0109] In some embodiments, calibrating the feature identifiers on the roller with the feature identifiers in the first image to determine the pixel equivalent includes the following specific implementation methods.

[0110] Specifically, during the rotation of the roller, multiple image data of the roller are continuously acquired; the continuously acquired image data are sorted and stitched according to the time sequence to obtain a planar unfolded image of the roller; the planar unfolded image of the roller is identified to determine the pixel distance between adjacent scale lines and / or the pixel distance between marker lines; the pixel equivalent is determined based on the pixel distance between adjacent scale lines and the physical distance between adjacent scale lines on the roller, and / or based on the pixel distance between adjacent marker lines and the physical distance between adjacent marker lines on the roller.

[0111] In the technical solution of this application embodiment, a planar unfolded image is obtained by stitching together multiple consecutive image data containing feature identifiers. The pixel distance is determined based on the pixel distance between adjacent scale lines in the planar unfolded image and the physical distance between adjacent scale lines on the roller and / or the pixel distance between the marker lines and the physical distance between the marker lines on the roller. This helps to determine the actual size of the electrode to be detected based on the pixel size in the image, thereby improving detection efficiency and detection accuracy.

[0112] Step S12 involves recognizing the first image to determine the detection information of the electrode to be detected and the feature identifier. Step S13 involves determining the size detection result of the electrode to be detected based on the detection information of the electrode to be detected and the feature identifier. The specific steps include the following steps.

[0113] In some embodiments, the feature identifier includes at least two identifier lines, which are spaced apart in the circumferential direction of the roller, and the electrode to be tested is located between the two identifier lines; the detection result includes width data.

[0114] The first image is recognized to determine the position information of the electrode to be detected and the position information of the marker line. Based on the position information of the electrode to be detected and the position information of the marker line, the width data of the electrode to be detected at the current moment is determined. The width data represents the size data of the electrode to be detected in a first direction, which is the direction perpendicular to the transmission direction of the electrode to be detected.

[0115] In some specific embodiments, during the process of the electrode sheet to be tested passing through the roller, the image acquisition unit acquires an image of the electrode sheet to be tested on the roller at the current moment to obtain a first image at the current moment. The first image is then used to identify and determine the position information of the two side edges of the electrode sheet to be tested and the position information of the marker lines in the first image. Based on the position information of the two side edges of the electrode sheet to be tested and the position information of the marker lines in the first image, and the physical distance between the two marker lines on the roller, the width data of the electrode sheet to be tested at the current moment is determined.

[0116] Specifically, the position information of the two marking lines on the roller in the first image are (x1, 0) and (x2, 0), respectively; the position information of the two sides of the electrode to be tested in the first image are (x3, 0) and (x4, 0), respectively; the physical distance between the two marking lines on the roller is W1, then the width data of the electrode to be tested at the current moment is W2 = W1 * (x4 - x3) / (x2 - x1).

[0117] In the technical solution of this application embodiment, the width data of the electrode to be detected is determined by identifying the position information of the electrode to be detected and the position information of the marking line in the first image, thereby improving the detection efficiency and detection accuracy.

[0118] In some embodiments, the feature identifier includes a scale arranged circumferentially along the roller, with the scale lines in the scale evenly spaced; the electrode to be tested has an identifier position; the scale has a reference line; the test result includes length data; the length data represents the size data of the electrode to be tested in a second direction, the second direction being the transmission direction of the electrode to be tested.

[0119] Please see Figure 9 , Figure 9 This is a flowchart illustrating a specific embodiment of the electrode detection method provided in this application.

[0120] S121: Based on the first image, determine the scale line corresponding to the marked position of the electrode to be detected and the scale line corresponding to the current time; the scale line corresponding to the marked position is used as the baseline.

[0121] Specifically, the first image at the current moment is stitched together with the first image from a previous historical moment to obtain a stitched image of the electrode to be tested on the roller; the stitched image is then identified to obtain the scale line corresponding to the marked position of the electrode to be tested and the scale line corresponding to the current moment. The first image is a line scan image.

[0122] In the technical solution of this application embodiment, a stitched image is obtained by stitching the first image at the current moment with the first image at a historical moment. The position information of the scale line in the stitched image is identified to determine the length data of the electrode to be detected at the current moment, thereby improving the detection accuracy of the length and width data of the electrode to be detected.

[0123] S122: Based on the number of intervals between adjacent scale lines corresponding to the current time and the baseline, determine the length data of the electrode to be tested at the current time. The length data represents the distance between the electrode and the marked position.

[0124] Specifically, in the stitched image, the number of times the baseline appears between the scale line corresponding to the marked position of the electrode to be tested and the scale line corresponding to the current time is taken as the number of rotations of the roller; the length data of the electrode to be tested at the current time is determined based on the number of intervals between adjacent scale lines between the scale line corresponding to the current time and the baseline, the physical distance between adjacent scale lines, the number of rotations of the roller and the circumference.

[0125] In one specific embodiment, the physical circumference of the roller is C, the number of intervals between adjacent scale lines between the current scale line and the baseline is N, that is, N is the number of scales of a non-complete circle, the number of rotations of the roller is n, and the physical distance between adjacent scale lines is d. Then, the length data of the electrode to be tested at the current moment is L=N*d+n*C.

[0126] In the technical solution of this application embodiment, the length data of the electrode to be tested at the current moment is determined based on the number of intervals between adjacent scale lines between the scale line and the baseline corresponding to the current moment, the physical distance between adjacent scale lines, the number of rotations corresponding to the roller, and the circumference, thereby improving the detection accuracy of the length data of the electrode to be tested.

[0127] In the technical solution of this application embodiment, the pixel distance of the electrode to be detected in the second direction at the current time is determined based on the first image at the current time, and the length data of the electrode to be detected is determined according to the pixel distance of the electrode to be detected in the second direction and the pixel equivalent, thereby improving detection efficiency and detection accuracy.

[0128] In some embodiments, the electrode inspection system further includes a die-cutting mechanism and an inspection mechanism, the die-cutting mechanism and the inspection mechanism being spaced apart, and the electrode to be inspected includes at least one single-cell electrode.

[0129] Please see Figure 10 , Figure 10 This is a flowchart illustrating another specific embodiment of the electrode detection method provided in this application.

[0130] The electrode detection method also includes the following steps.

[0131] S411: Count the number of pulse signals from the time the die-cutting mechanism cuts the marking hole on the edge of the single cell electrode to the time the detection mechanism detects the defect mark on the single cell electrode.

[0132] S412: Based on the number of pulse signals and the physical distance between the die-cutting mechanism and the detection mechanism, determine the detection distance in the second direction between the defect mark and the mark hole in the single cell electrode sheet.

[0133] In some specific embodiments, the difference between the product of the statistically calculated number of pulse signals and the equivalent unit length of the pulse signal, and the physical distance between the detection mechanism and the die-cutting mechanism, is used as the detection distance between the defect marker and the marking hole. Here, the equivalent unit length of the pulse signal represents the transmission length of the electrode to be detected between adjacent pulse signals.

[0134] Where the number of pulse signals counted is M, the unit length equivalent of the pulse signal is p, and the physical distance between the detection mechanism and the die-cutting mechanism is D, then the detection distance between the defect mark and the mark hole is H=|M*pD|.

[0135] In the technical solution of this application embodiment, the detection distance between the defect mark and the mark hole of the single cell electrode is determined by statistically analyzing the number of pulse signals corresponding to the process from the die-cutting mechanism cutting the mark hole on the edge of the single cell electrode to the detection mechanism detecting the defect mark on the single cell electrode, as well as the physical distance between the die-cutting mechanism and the detection mechanism, thereby improving detection efficiency and detection accuracy.

[0136] Please see Figure 11 , Figure 11 This is a schematic flowchart of another embodiment of the electrode detection method provided in this application.

[0137] In one embodiment, an electrode detection method is provided, which includes the following steps.

[0138] S21: Inspect the electrode to be tested and determine the size test results of the electrode to be tested.

[0139] S22: Based on the size detection results of the electrode to be tested, determine whether the electrode to be tested meets the preset requirements.

[0140] In the technical solution of this application embodiment, the appearance inspection of the electrode to be inspected is realized by determining whether the electrode to be inspected meets the preset requirements based on the size detection results of the electrode to be inspected, thereby improving the detection efficiency and detection accuracy.

[0141] In one embodiment, the electrode detection method described in the above embodiment is used to detect the electrode to be detected in real time and determine the detection results of the electrode at each acquisition time.

[0142] The size detection results of the electrode to be inspected can include the first image of the electrode tab at each acquisition time and the corresponding stitched image at each acquisition time. The stitched image corresponding to each acquisition time is composed of the first image at that acquisition time and the first images of all historical acquisition times prior to that acquisition time. The stitched image contains the electrode tab to be inspected and feature markers, so as to determine the size information of the electrode tab to be inspected based on the feature markers in the stitched image. The detection results include the width and length data of the electrode tab to be inspected at the current time. The detection results may also include the spacing between the electrodes in the electrode to be inspected, and the detection distance between the defect markers and the marking holes in the electrode to be inspected.

[0143] In one embodiment, the electrode to be tested includes a single-core electrode, which has a first end and a second end. The first end of the single-core electrode is the start end of the single-core electrode, and the second end is the end end of the single-core electrode. The electrode detection method in the above embodiment is used to detect the first single-core electrode of the electrode to be tested to determine the detection result of the single-core electrode. The detection result of the single-core electrode includes a stitched image of the single-core electrode, and also includes the size information of the single-core electrode, including the width data, length data, and the spacing distance between adjacent tabs in the single-core electrode.

[0144] In some embodiments, the step S22, which determines whether the electrode to be tested meets the preset requirements based on the size detection results of the electrode to be tested, specifically includes the following implementation methods.

[0145] Specifically, the size measurement results of the electrode to be tested are verified to determine whether the size measurement results of the electrode to be tested are valid.

[0146] In one specific embodiment, the scale lines of the spliced ​​image of the electrode to be tested on the roller are identified to determine the number of scale lines and the distance between the scale lines within a preset range; if the number of scale lines or the distance between the scale lines within the preset range does not meet the corresponding preset value, the size detection result of the electrode to be tested is determined to be invalid.

[0147] In the technical solution of this application embodiment, by detecting the number of scale lines and the distance between scale lines within a preset range, it is determined whether the counting logic in the image acquisition device and / or detection mechanism is accurate, thereby determining whether the size detection result of the electrode to be detected is valid and reliable.

[0148] Please see Figure 12 and Figure 13 , Figure 12 This is a schematic diagram showing an abnormal resolution of the image acquisition component in the stitched image provided in this application; Figure 13 This is a schematic diagram showing a missing line in the image acquisition component of the stitched image provided in this application.

[0149] In one specific embodiment, the number of scale lines within a preset length range in the stitched image is statistically determined; and the distance between adjacent scale lines is detected. If the number of scale lines within the preset length range equals a preset number, and the distance between adjacent scale lines equals a preset distance, the size detection result of the electrode to be detected is determined to be valid; if the number of scale lines within the preset length range does not equal a preset number, or the distance between adjacent scale lines does not equal a preset distance, the size detection result of the electrode to be detected is determined to be invalid.

[0150] By detecting the distance between adjacent scale lines, it can be determined whether there are any abnormalities in the image acquisition device's capture. When there are abnormalities in the image acquisition device's capture, it indicates that the resolution of the image acquisition device is abnormal, such as... Figure 12 By detecting the number of scale lines within a preset length range, it can be determined whether there is an abnormality in the encoder counting unit of the detection mechanism; if there is an abnormality in the encoder counting unit, it indicates that the image acquisition device is experiencing line loss during shooting, such as... Figure 13 .

[0151] In one embodiment, if the distance between adjacent scale lines or the number of scale lines within a preset length range in the stitched image of the electrode to be tested does not conform to the corresponding preset value, then the size detection result of the electrode to be tested corresponding to the stitched image is determined to be invalid. The size detection result of the electrode to be tested cannot represent the true size of the electrode to be tested.

[0152] In one embodiment, if the distance between adjacent scale lines or the number of scale lines within a preset length range in the stitched image of the electrode to be tested both meet the corresponding preset values, then the size detection result of the electrode to be tested corresponding to the stitched image is determined to be valid. The size detection result of the electrode to be tested can represent the true size of the electrode to be tested.

[0153] In one embodiment, in response to the valid size detection result of the electrode to be tested, it is determined whether the electrode to be tested meets the preset requirements based on the size detection result of the electrode to be tested.

[0154] Specifically, if the difference between the size detection result of the electrode to be tested and the preset result does not exceed a threshold, the electrode to be tested is determined to meet the preset requirements. If the difference between the size detection result of the electrode to be tested and the preset result exceeds a threshold, the electrode to be tested is determined to not meet the preset requirements. The size detection result of the electrode to be tested is then displayed on the screen.

[0155] In one embodiment, if the first single-cell electrode of the electrode to be tested meets the preset requirements, then the other parts of the electrode to be tested after the first single-cell electrode can be produced.

[0156] In the technical solution of this application embodiment, the size detection result of the electrode to be tested is verified by comparing it with a preset result, which helps to improve the reliability of the size detection result of the electrode to be tested.

[0157] In the technical solution of this application embodiment, the validity of the size detection result of the electrode to be tested is determined by verifying the size detection result of the electrode to be tested, thereby improving the reliability of the size detection result of the electrode to be tested and helping to screen electrodes based on the size detection result of the electrode to be tested.

[0158] It should be noted that by evaluating the safety of the electrode under test based on its size, it is possible to determine more efficiently and accurately whether the electrode meets safety standards. Furthermore, if it is determined that the electrode does not meet the standards, an alarm can be triggered to quickly notify the staff and prompt safety personnel to make adjustments to the electrode.

[0159] The above are merely embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. An electrode detection system, characterized in that, The electrode detection system includes: The guide roller is used to transport the electrode sheet to be tested; the guide roller is provided with a feature mark; An image acquisition device is used to acquire images of the electrode to be detected and the feature mark on the roller to determine a first image; The controller, which is communicatively connected to the image acquisition unit and the roller, is used to identify the first image and determine the detection information of the electrode to be detected and the feature identifier; based on the detection information, it determines the size detection result of the electrode to be detected.

2. The electrode detection system according to claim 1, characterized in that, The feature marking includes at least two marking lines, which are spaced apart on the circumferential direction of the roller, and the electrode to be tested is located between the two marking lines; The step of determining the detection information of the electrode to be detected and the feature identifier includes: the controller is configured to recognize the first image and determine the position information of the electrode to be detected and the position information of the identifier line; The step of determining the size detection result of the electrode to be tested includes: the controller is configured to determine the size data of the electrode to be tested in a first direction based on the position information of the electrode to be tested and the position information of the marking line, wherein the first direction is a direction perpendicular to the transmission direction of the electrode to be tested.

3. The electrode detection system according to claim 1 or 2, characterized in that, The feature identifier includes a scale, which is arranged circumferentially along the roller, and the scale lines in the scale are evenly spaced. The scale has a baseline; The step of determining the detection information of the electrode to be detected and the feature identifier includes: the controller is configured to identify the first image and determine the scale line in the first image; The determination of the size detection result of the electrode to be tested includes: the controller is configured to determine the size data of the electrode to be tested in a second direction based on the scale line and the baseline in the first image, wherein the second direction is the transmission direction of the electrode to be tested.

4. The electrode detection system according to claim 3, characterized in that, The scale is multiple, including a first scale and a second scale. The first scale and the second scale are spaced apart. The spacing between adjacent scale lines in the first scale is different from the spacing between adjacent scale lines in the second scale, and / or the scale lines in the first scale and the scale lines in the second scale are misaligned.

5. The electrode detection system according to claim 3, characterized in that, The electrode testing system further includes a die-cutting mechanism and a testing mechanism, which are spaced apart. The testing mechanism is located downstream of the die-cutting mechanism, and both the die-cutting mechanism and the testing mechanism are connected to the controller. The die-cutting mechanism is used to die-cut the edges of the electrode sheet to be tested to form electrode tabs; The testing mechanism is used to identify defect markings on the electrode sheet to be tested; In response to the die-cutting mechanism cutting out marking holes on the electrode to be tested, the controller is used to record pulse signals; In response to the detection mechanism detecting the defect mark on the electrode to be tested, the controller is used to stop recording pulse signals; The controller is used to determine the detection distance in the second direction between the defect mark and the mark hole based on the statistical number of pulse signals and the physical distance between the detection mechanism and the die-cutting mechanism.

6. A method for detecting electrode sheets, characterized in that, The electrode testing system applicable to any one of claims 1 to 5, the electrode testing method comprising: During the process of the electrode sheet to be tested passing through the roller, the first image of the electrode sheet to be tested on the roller at the current moment is acquired; The first image is identified to determine the detection information of the electrode to be detected and the feature identifier; Based on the detection information of the electrode to be tested and the feature identifier, the size detection result of the electrode to be tested is determined.

7. The electrode detection method according to claim 6, characterized in that, The feature identifier includes at least two identifier lines, which are spaced apart on the circumferential direction of the roller, and the electrode to be tested is located between the two identifier lines; the size detection result includes width data; the width data represents the size data of the electrode to be tested in a first direction, which is a direction perpendicular to the transmission direction of the electrode to be tested; The step of identifying the first image to determine the detection information of the electrode to be detected and the feature identifier includes: The first image is identified to determine the position information of the electrode to be detected and the position information of the marking line; The determination of the size detection result of the electrode to be tested based on the detection information of the electrode to be tested and the feature identifier includes: Based on the position information of the electrode to be tested and the position information of the marking line, the width data of the electrode to be tested at the current time is determined.

8. The electrode detection method according to claim 6 or 7, characterized in that, The feature identifier includes a scale, which is arranged circumferentially along the roller, and the scale lines in the scale are evenly spaced; the electrode to be tested has an identified position; the scale has a reference line; the test result includes length data; the length data represents the size data of the electrode to be tested in a second direction, the second direction being the transmission direction of the electrode to be tested; The step of identifying the first image to determine the detection information of the electrode to be detected and the feature identifier includes: Based on the first image, the scale line corresponding to the marked position of the electrode to be detected and the scale line corresponding to the current time are determined; the scale line corresponding to the marked position is used as the baseline. The determination of the size detection result of the electrode to be tested based on the detection information of the electrode to be tested and the feature identifier includes: Based on the number of intervals between adjacent scale lines between the scale line and the baseline at the current time, the length data of the electrode to be tested at the current time is determined, and the length data represents the distance between the electrode and the marked position.

9. The electrode detection method according to claim 8, characterized in that, The step of determining the scale line corresponding to the identification position of the electrode to be detected and the scale line corresponding to the current time based on the first image includes: The first image at the current moment is stitched together with the first image at a previous historical moment to determine the stitched image of the electrode to be detected on the roller. The stitched image is identified to determine the scale line corresponding to the marked position of the electrode to be detected and the scale line corresponding to the current time.

10. The electrode detection method according to claim 9, characterized in that, Determining the length data of the electrode to be tested at the current time based on the number of intervals between adjacent scale lines between the scale line and the baseline at the current time includes: In the stitched image, the number of times the baseline appears between the scale line corresponding to the identification position of the electrode to be detected and the scale line corresponding to the current time is taken as the number of rotations of the roller; The length of the electrode to be tested at the current moment is determined based on the number of intervals between adjacent scale lines between the scale line and the baseline corresponding to the current moment, the physical distance between adjacent scale lines, the number of rotations corresponding to the roller, and the circumference.

11. The electrode detection method according to claim 8, characterized in that, The electrode detection method further includes: The feature identifier on the roller is compared with the feature identifier in the first image to determine the pixel equivalent.

12. The electrode detection method according to claim 11, characterized in that, The step of calibrating the feature identifier on the roller with the feature identifier in the first image to determine the pixel equivalent includes: During the rotation of the roller, multiple image data of the roller are continuously acquired; The continuously acquired image data is sorted and stitched according to time sequence to determine the planar unfolded image of the roller; The planar unfolded image of the roller is identified to determine the pixel distance between adjacent scale lines and / or the pixel distance between marker lines; The pixel equivalent is determined based on the pixel distance between adjacent scale lines and the physical distance between adjacent scale lines on the roller, and / or based on the pixel distance between adjacent marker lines and the physical distance between adjacent marker lines on the roller.

13. The electrode detection method according to claim 8, characterized in that, The electrode inspection system further includes a die-cutting mechanism and an inspection mechanism, wherein the die-cutting mechanism and the inspection mechanism are spaced apart, the electrode to be inspected includes at least one single-cell electrode, and the electrode inspection method further includes: The number of pulse signals corresponding to the process from the die-cutting mechanism cutting the marking hole on the edge of the single cell electrode to the detection mechanism detecting the defect mark on the single cell electrode is counted. Based on the number of pulse signals and the physical distance between the die-cutting mechanism and the detection mechanism, the detection distance in the second direction between the defect mark and the mark hole in the single-cell electrode is determined.

14. A method for detecting electrode sheets, characterized in that, The electrode detection method includes: The electrode to be tested is tested using the electrode testing method according to any one of claims 6 to 13, and the size test result of the electrode to be tested is determined. Based on the size detection results of the electrode to be tested, it is determined whether the electrode to be tested meets the preset requirements.

15. The electrode detection method according to claim 14, characterized in that, The electrode detection method further includes: The size detection results of the electrode to be tested are verified to determine whether the size detection results of the electrode to be tested are valid. The step of determining whether the electrode to be tested meets the preset requirements based on the size detection results of the electrode to be tested includes: If the size detection result of the electrode to be tested is valid, then it is determined whether the electrode to be tested meets the preset requirements based on the size detection result of the electrode to be tested.

16. The electrode detection method according to claim 15, characterized in that, The size detection result of the electrode to be tested includes a stitched image of the electrode to be tested on the roller; The step of verifying the size detection results of the electrode to be tested, and determining whether the size detection results of the electrode to be tested are valid, includes: The spliced ​​image of the electrode to be tested on the roller is subjected to scale line recognition to determine the number of scale lines and the distance between the scale lines within a preset range; If the number of scale lines or the distance between scale lines within the preset range does not conform to the corresponding preset value, the size detection result of the electrode to be tested is determined to be invalid.

17. The electrode detection method according to claim 14, characterized in that, The step of determining whether the electrode to be tested meets the preset requirements based on the size detection results of the electrode to be tested includes: If the difference between the size detection result of the electrode to be tested and the preset result does not exceed the threshold, then the electrode to be tested is determined to meet the preset requirements.

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