Battery cell surface defect point inspection device and point inspection equipment

Abstract

The utility model relates to the technical field of calibration of image sensors, in particular to a cell surface defect point inspection device and point inspection equipment. The cell surface defect point inspection device comprises a point inspection calibration piece, the point inspection calibration piece is used for simulating the appearance of a standard cell, the point inspection calibration piece is provided with a front face, a top face and a side face which are perpendicular to one another, and at least one of the front face, the top face and the side face of the point inspection calibration piece is provided with a point inspection part. The point inspection part protrudes out of or sinks into the surface of the point inspection calibration piece according to a preset height difference value, and the point inspection part is used for calibrating the image sensor. The point inspection part with the preset height difference value is arranged on the surface of the point inspection calibration part, so that the image sensor can shoot the point inspection part and collect the image, then the collected image is processed and analyzed to obtain the image depth value, the image depth value is compared with the preset height difference value, and the accuracy of the point inspection calibration part is improved. Therefore, whether the image sensor generates visual precision deviation is determined.

Description

Technical Field

[0001] This application relates to the field of image sensor technology in calibrating automatic optical inspection equipment, specifically to a battery cell surface defect inspection device and inspection equipment. Background Technology

[0002] With the rapid development of electric vehicles and the increasing demands for energy conservation and environmental protection, the production requirements for battery cells, a key component inside electric vehicles, are also becoming increasingly stringent. During the battery cell production process, defects such as scratches, swelling, and dents are inevitable on the cell casing. To ensure product quality, existing technology uses Automated Optical Inspection (AOI) equipment to detect defects on all six sides of the battery cell's appearance, thus filtering out cells with poor appearance. However, after long-term use, the visual inspection accuracy of AOI equipment will deviate, affecting the accuracy of the inspection results. Therefore, it is necessary to perform spot checks and corrections on the vision of AOI equipment. Utility Model Content

[0003] The main technical problem addressed by this application is to provide a battery cell surface defect inspection device and equipment for visual inspection and correction of automatic optical inspection equipment.

[0004] According to a first aspect, one embodiment provides a battery cell surface defect inspection device for calibrating an image sensor in an automated optical inspection device, the battery cell surface defect inspection device comprising:

[0005] The calibration component is used to simulate the shape of a standard battery cell. The calibration component has a front, top, and side surfaces that are perpendicular to each other. A calibration part is provided on at least one of the front, top, and side surfaces of the calibration component. The calibration part protrudes or is recessed on the surface of the calibration component with a preset height difference. The calibration part is used to calibrate the image sensor.

[0006] In some embodiments, the inspection and calibration component further has a back side disposed opposite to the front side, and two oppositely disposed sides;

[0007] The inspection calibration piece has multiple inspection sections on its front, back, top, and at least one of its two sides, and the multiple inspection sections located on the same surface have different preset height differences relative to that surface.

[0008] In some embodiments, a plurality of inspection sections located on the same surface on the inspection calibration piece are arranged in an array, and the differences in the preset height differences of the plurality of inspection sections on the same array are distributed in an arithmetic sequence.

[0009] In some embodiments, the cell surface defect inspection device further includes a photosensitive element;

[0010] The photosensitive element is disposed on at least one of the front, top, and side surfaces of the inspection and calibration component, and the surface of the photosensitive element is provided with a calibration pattern, which is used to calibrate the image sensor.

[0011] In some embodiments, the photosensitive element includes a first photosensitive element;

[0012] The calibration pattern on the surface of the first photosensitive element includes multiple cells arranged in an alternating black and white array. Each cell has a preset length value. The cell is used to calibrate the length value when the image sensor identifies surface defects of the battery cell under test. At least one of the first photosensitive elements is provided on the front, top, and side surfaces of the inspection calibration component.

[0013] In some embodiments, the inspection and calibration component includes a body and a pole portion;

[0014] The main body is provided with a front surface, a top surface and a side surface, the pole part is provided on the top surface of the main body, and the first photosensitive element is connected to the top of the pole part.

[0015] In some embodiments, the preset length value of the cell in the first photosensitive element at the top of the pole portion is smaller than the preset length value of the cell in the first photosensitive element on the surface of the body portion.

[0016] In some embodiments, the photosensitive element includes a second photosensitive element;

[0017] The calibration pattern on the surface of the second photosensitive element includes multiple grids with different preset gray values. The grids are used to calibrate the gray values ​​when the image sensor identifies surface defects of the battery cell under test. At least one second photosensitive element is provided on the front, top, and side surfaces of the inspection calibration component.

[0018] In some embodiments, the inspection calibration component further includes a clamping portion;

[0019] The inspection and calibration component also has a back side opposite to the front side, and the clamping portion is recessed in the front side and the back side for clamping by the clamping mechanism in the automatic optical inspection equipment.

[0020] According to a second aspect, one embodiment provides an inspection device, comprising:

[0021] The cell surface defect inspection device described in any of the above embodiments; and,

[0022] An automatic optical inspection device has multiple inspection stations, each of which is equipped with multiple image sensors located at different positions. The multiple image sensors located at different positions are used to capture images of the surface defects of the battery cell.

[0023] This application establishes a pre-defined height difference feature on the surface of the inspection calibration piece, allowing an image sensor to capture images of this feature. The acquired images are then processed and analyzed to derive depth values. By comparing these depth values ​​with the pre-defined height difference, it can be determined whether the image sensor exhibits visual accuracy deviation when identifying the height difference of defects on the surface of the tested battery cell. This improves the image sensor's accuracy, resulting in more accurate outputs of measurement results regarding the three-dimensional morphological differences and geometric tolerance differences of the tested battery cell's surface defects. During calibration, there is no need to install or disassemble the image sensor. Simply transporting the battery cell surface defect inspection device onto the automated optical inspection equipment completes the calibration of the image sensor within the automated optical inspection equipment. The operation is simple and the calibration efficiency is high. Furthermore, the battery cell surface defect inspection device of this application is reusable, thereby reducing the cost of image sensor calibration in automated optical inspection equipment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the automatic optical inspection equipment in the inspection equipment of this application;

[0025] Figure 2 for Figure 1 A schematic diagram of the front-end inspection device in an automated optical inspection equipment;

[0026] Figure 3 for Figure 1 A schematic diagram of the mid-section inspection device in an automated optical inspection equipment;

[0027] Figure 4 for Figure 1 A schematic diagram of the circulating line inspection device in an automated optical inspection equipment;

[0028] Figure 5 This is a three-dimensional structural diagram of the battery cell surface defect inspection device in the inspection equipment of this application;

[0029] Figure 6 for Figure 5 A structural schematic diagram of the midpoint calibration piece from another perspective;

[0030] Figure 7 for Figure 4 Enlarged structural diagram of point A of the intermediate circulation line detection device;

[0031] Figure 8 for Figure 5Enlarged structural diagram of section B of the battery cell surface defect inspection device;

[0032] Figure 9 for Figure 5 A schematic diagram of the calibration pattern on the first photosensitive element;

[0033] Figure 10 for Figure 5 A schematic diagram of the calibration pattern on the second photosensitive element.

[0034] Figure label:

[0035] 100-Front-end inspection device; 10-First frame; 11-Bar scanning inspection module; 12-Bar scanning NG module; 13-Feeding and handling module; 14-Front-end transfer module; 15-Front-end inspection and handling module; 16-Bottom edge detection module; 17-Transfer positioning module; 18-Side edge and bottom edge detection module; 19-Front-end rotary transfer variable pitch module;

[0036] 200 - Mid-section inspection device; 20 - Second frame; 21 - Mid-section inspection and handling module; 22 - Side appearance inspection module; 23 - Bottom appearance inspection module; 24 - Mid-section transplanting and variable pitch rotation module;

[0037] 300 - Circulation line inspection device; 30 - Third frame; 31 - Circulation line loading module; 32 - Circulation line handling module; 33 - Top surface appearance inspection module; 34 - Large surface appearance inspection module; 35 - Pole post inspection module; 36 - Top surface corner inspection module; 37 - Top surface edge inspection module; 38 - Explosion-proof valve inspection module; 39 - Circulation line loading module;

[0038] 400 - Cell under test;

[0039] 500-Cell surface defect inspection device; 51-Inspection calibration piece; 501-Main body; 502-Terminal post; 511-Front side; 512-Top surface; 513-Side side; 514-Inspection section; 515-Back side; 52-Photosensitive element; 521-First photosensitive element; 522-Second photosensitive element; 53-Clamping part. Detailed Implementation

[0040] The present application will be further described in detail below with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0041] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0042] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages).

[0043] Currently, most battery cells used in electric vehicles are prismatic cells, which have six surfaces: front, back, top, bottom, and two sides. To ensure product quality and safety, the six surfaces of the battery cell, as well as the appearance of the explosion-proof valve and terminals, need to be inspected for defects during the production process. These defects include, but are not limited to, variations in the three-dimensional morphology or geometric tolerances of defects such as bumps, leaks, scratches, dents, and pits. In existing technologies, visual inspection of battery cells is mostly done manually, which is time-consuming and labor-intensive. Furthermore, the results are highly dependent on the inspector's skills and focus, introducing subjective factors and increasing the risk of missed or incorrect detections. Therefore, automated optical inspection equipment for visual defect inspection of battery cells has emerged. Automated optical inspection equipment uses image sensors such as charge-coupled device (CCD) cameras or complementary metal-oxide-semiconductor (CMOS) cameras to visually inspect the appearance defects of the battery cells. However, after long-term use, the visual accuracy of image sensors such as CCD cameras or CMOS cameras in automated optical inspection equipment will deviate, thereby affecting the reliability and stability of cell appearance defect detection.

[0044] To improve the reliability and stability of cell appearance defect detection, this application provides an inspection device, such as... Figures 1 to 10 As shown, the inspection equipment may include an automatic optical inspection device and a cell surface defect inspection device 500. For example... Figures 1 to 4 As shown, the automatic optical inspection equipment may include a front-end inspection device 100, a middle-end inspection device 200, and a circulation line inspection device 300. The front-end inspection device 100 can be used to inspect the bottom corners, side edges, and bottom edge of the battery cell 400 under test. The middle-end inspection device 200 can be used to inspect the side and bottom appearance of the battery cell 400 under test. The circulation line inspection device 300 can be used to inspect the top, front, and back appearance, terminals, top corners, top edge, and explosion-proof valve of the battery cell 400 under test. However, this application does not impose special restrictions on the testing procedures of the automated optical inspection equipment. For example, in other embodiments, depending on the different settings of the testing process for the battery cell 400 under test, the front-end testing device 100 can also be configured to inspect the top surface appearance, top surface edges, side edges, terminals, and explosion-proof valve of the battery cell 400 under test; the middle-end testing device 200 can also be configured to inspect the bottom surface corners, bottom surface edges, and bottom surface appearance of the battery cell 400 under test; and the circulation line testing device 300 can also be configured to inspect the side edges, side appearance, front appearance, and back appearance of the battery cell 400 under test. The following embodiments will provide a detailed description of the specific structure of the automated optical inspection equipment.

[0045] like Figure 2 As shown, the front-end inspection device 100 may include a first frame 10 and a barcode inspection module 11, a barcode NG module 12, a loading and handling module 13, a front-end transfer module 14, a front-end inspection and handling module 15, a bottom edge detection module 16, a transfer and positioning module 17, a side edge and bottom edge detection module 18, and a front-end rotary transfer variable pitch module 19 mounted on the first frame 10. During inspection, multiple (e.g., four) battery cells 400 to be tested are transported to the barcode inspection module 11 via the loading belt of the logistics line. The barcode inspection module 11 is used to determine whether the QR code on the battery cell 400 to be tested is an NG code. If it is an NG code, the clamping mechanism of the loading and handling module 13 transfers the battery cell 400 to be tested to the barcode NG module 12. The barcode NG module 12 then uses a pull belt to transport the battery cell 400 identified as having an NG code out of the automatic optical inspection equipment. If the code is OK, the clamping mechanism of the loading and handling module 13 transfers the battery cell 400 under test to the front-end transfer module 14. The clamping mechanism on the front-end transfer module 14 clamps multiple battery cells 400 under test and transfers them to the front-end detection and handling module 15 via a linear screw module. During the transfer process, the center distance between the multiple battery cells 400 under test is increased by the linear screw module to meet the requirements of the bottom edge detection module 16 for the spacing of the multiple battery cells 400 under test. The left actuator of the linear motor in the front-end inspection and handling module 15 clamps multiple battery cells 400 to be tested and transfers them to the bottom edge detection module 16, where the bottom edge of each battery cell 400 is detected. After detection, the battery cells 400 are transferred to the intermediate positioning module 17. The right actuator of the linear motor in the front-end inspection and handling module 15 clamps multiple battery cells 400 to be tested and transfers them to the side edge and bottom edge detection module 18, where the side edge and bottom edge of each battery cell 400 are detected. After detection, the battery cells 400 are transferred to the front-end rotary transfer and pitch-changing module 19. The multiple battery cells 400 to be tested complete a 90-degree rotation and pitch change on the clamping mechanism of the front-end rotary transfer and pitch-changing module 19 to reduce the center distance between the multiple battery cells 400 to be tested. Finally, the multiple battery cells 400 to be tested are transferred to the intermediate inspection device 200.

[0046] like Figure 3As shown, the mid-section inspection device 200 may include a second frame 20 and a mid-section inspection and handling module 21, a side appearance inspection module 22, a bottom appearance inspection module 23, and a mid-section transfer and variable pitch rotation module 24 mounted on the second frame 20. Multiple cells 400 to be tested, after being transferred to the mid-section inspection device 200, are transferred to the mid-section inspection and handling module 21 via a linear screw module. Since the multiple cells 400 to be tested have already undergone a 90-degree rotation and pitch change on the clamping mechanism of the front-section rotary transfer and variable pitch module 19, the images of the cells 400 to be tested by the side appearance inspection module 22 and the bottom appearance inspection module 23 are composited and reduced. The linear motor clamping mechanism of the mid-section inspection and handling module 21 clamps the multiple cells 400 to be tested and sequentially passes through the side appearance inspection module 22 and the bottom appearance inspection module 23 at a uniform speed, thereby completing the side and bottom appearance inspections of the cells 400 to be tested. Subsequently, the clamping mechanism of the mid-section transplanting pitch-changing rotating module 24 clamps multiple test cells 400 and completes the pitch change and rotation of multiple test cells 400 through a four-moving linear motor equipped with a direct drive motor (DD). Finally, the multiple test cells 400 are transferred to the circulating line detection device 300.

[0047] like Figure 4 As shown, the circulating line testing device 300 includes a third frame 30 and a circulating line loading module 31, a circulating line handling module 32, a top surface appearance inspection module 33, a large surface appearance inspection module 34, a terminal post inspection module 35, a top surface corner inspection module 36, a top surface edge inspection module 37, an explosion-proof valve inspection module 38, and a circulating line loading module 39 mounted on the third frame 30. Multiple cells 400 to be tested, after being transferred to the circulating line testing device 300, are transferred by the clamping mechanism of the circulating line loading module 31 to the trolley fixture of the circulating line handling module 32. The trolley fixture, carrying multiple cells 400 to be tested, sequentially passes through the top surface appearance inspection module 33, the large surface appearance inspection module 34, and the terminal post inspection module 35 to complete the inspection. Subsequently, the trolley fixture transfers multiple battery cells 400 to be tested to the top edge detection module 36, the top edge detection module 37, and the explosion-proof valve detection module 38 via the circulating line transfer axis to complete the testing. Finally, the trolley fixture unloads the battery cells 400 into the circulating line feeding module 39. The clamping mechanism of the circulating line feeding module 39 clamps multiple battery cells 400 to be tested and transfers them to the OK logistics line or the NG logistics line for subsequent production processes.

[0048] Among them, the bottom edge detection module 16, side edge and bottom edge detection module 18, side appearance detection module 22, bottom appearance detection module 23, top appearance detection module 33, large surface appearance detection module 34, pole post detection module 35, top edge detection module 36, top edge detection module 37, and explosion-proof valve detection module 38, the equipment used to detect appearance defects of the battery cell 400 under test can use image sensors such as CCD cameras or CMOS cameras. This application does not impose any special restrictions on the specific type of image sensor in the automatic optical inspection equipment. In order to improve the visual accuracy of the image sensor, it is necessary to periodically calibrate the image sensor in the automatic optical inspection equipment to calibrate the visual accuracy of the image sensor. To this end, this application also provides a battery cell surface defect inspection device 500. This device 500 is used to capture images through an image sensor in an automated optical inspection device, process and analyze the images to obtain image depth values, and then compare these image depth values ​​with the actual depth values ​​on the battery cell surface defect inspection device 500 to obtain the visual accuracy deviation of the image sensor. Image sensors with visual accuracy deviations that do not meet the requirements are adjusted, thereby calibrating the image sensor in the automated optical inspection device.

[0049] The following embodiments will provide a detailed description of the specific structure of the battery cell surface defect inspection device 500. For example... Figure 5 and Figure 6 As shown, the battery cell surface defect inspection device 500 may include an inspection calibration component 51, which is used to simulate the shape of a standard battery cell. A standard battery cell refers to a battery cell without defects such as bumps, scratches, dents, or pits. Depending on the size of the different battery cells 400 under test, the inspection calibration component 51 may have different dimensions; this application does not impose any special restrictions on the specific dimensions of the inspection calibration component 51. The shape of the inspection calibration component 51 may be a cuboid with a length direction, a thickness direction, and a height direction. For ease of description, the X direction will be used as the length direction of the inspection calibration component 51, the Y direction as the thickness direction, and the Z direction as the height direction. Thus, the inspection and calibration component 51 has a front surface 511, a top surface 512, and a side surface 513 that are perpendicular to each other. An inspection part 514 is provided on at least one of the front surface 511, the top surface 512, and the side surface 513 of the inspection and calibration component 51. The inspection part 514 protrudes or is recessed on the surface of the inspection and calibration component 51 with a preset height difference. The inspection part 514 is used to calibrate the image sensor.

[0050] When it is necessary to calibrate the image sensor in the large-area appearance inspection module 34 used to inspect the front 511 of the battery cell 400 under test, the clamping mechanism in the automatic optical inspection equipment can clamp the inspection calibration piece 51, so that the inspection part 514 on the front 511 of the inspection calibration piece 51 faces the image sensor in the large-area appearance inspection module 34 and is located within the depth of field of the image sensor. The image sensor takes pictures and acquires images of the inspection part 514, and then processes and analyzes the acquired images to obtain image depth values. By comparing the preset height difference value (i.e., the actual depth value) on the inspection part 514 with the processed and analyzed image depth value, it can be determined whether the image sensor in the large-area appearance inspection module 34 has a visual accuracy deviation. Similarly, when it is necessary to calibrate the image sensor in the top-area appearance inspection module 33, the clamping mechanism in the automatic optical inspection equipment can clamp the inspection calibration piece 51, so that the inspection part 514 on the top surface 512 of the inspection calibration piece 51 faces the image sensor in the top-area appearance inspection module 33 and is located within the depth of field of the image sensor. The image sensor captures and acquires images from the inspection unit 514, then processes and analyzes the acquired images to obtain image depth values. By comparing the preset height difference value on the inspection unit 514 with the processed image depth value, it can be determined whether the image sensor in the top surface appearance inspection module 33 has a visual accuracy deviation. Similarly, when it is necessary to calibrate the image sensor in the side appearance inspection module 22, the clamping mechanism in the automatic optical inspection equipment can clamp the inspection calibration piece 51, so that the inspection unit 514 on the side 513 of the inspection calibration piece 51 faces the image sensor in the side appearance inspection module 22 and is located within the depth of field of the image sensor. The image sensor captures and acquires images from the inspection unit 514, then processes and analyzes the acquired images to obtain image depth values. By comparing the preset height difference value on the inspection unit 514 with the processed image depth value, it can be determined whether the image sensor in the side appearance inspection module 22 has a visual accuracy deviation. If the image sensor in any of the above modules has a visual accuracy deviation, the corresponding image sensor is adjusted to calibrate the image sensor.

[0051] It is understood that the preset height difference value of the inspection unit 514 can be characterized either by a structure recessed into the surface of the inspection calibration component 51 or by a structure protruding from the surface of the inspection calibration component 51. Regardless of whether the inspection unit 514 is recessed or protruding from the surface of the inspection calibration component 51, the image sensor in the automatic optical inspection equipment can acquire image depth values ​​within the depth of field. The image depth values ​​are then compared with the preset height difference value to determine whether the image sensor has produced a visual accuracy deviation. This application does not impose any special restrictions on whether the inspection unit 514 protrudes or is recessed from the surface of the inspection calibration component 51.

[0052] This application provides an inspection section 514 with a preset height difference value on the surface of the inspection calibration part 51. This allows the image sensor to capture images of the inspection section, process and analyze the captured images to obtain image depth values, and compare these depth values ​​with the preset height difference value. This allows the image sensor to determine whether it produces visual accuracy deviations when identifying the height difference value of the surface defects of the battery cell 400 under test, thereby improving the accuracy of the image sensor and outputting more accurate measurement results such as the three-dimensional morphological differences and geometric tolerance differences of the surface defects of the battery cell 400 under test. During the calibration process, there is no need to install or disassemble the image sensor. The battery cell surface defect inspection device 500 only needs to be transported normally on the automatic optical inspection equipment to complete the calibration function of the image sensor in the automatic optical inspection equipment. The operation is simple and the calibration efficiency is high. In addition, the battery cell surface defect inspection device 500 of this application can be reused, thereby reducing the cost of image sensor calibration in automatic optical inspection equipment.

[0053] In some embodiments, such as Figure 5 and Figure 6 As shown, the inspection calibration component 51 also has a back surface 515 opposite to the front surface 511 and two opposite side surfaces 513; at least one of the front surface 511, back surface 515, top surface 512, and two side surfaces 513 of the inspection calibration component 51 is provided with a plurality of inspection parts 514, and the plurality of inspection parts 514 located on the same surface have different preset height differences relative to that surface. When inspection parts 514 are provided on the front surface 511, back surface 515, top surface 512, and two side surfaces 513, as Figure 7 As shown, taking the large-area appearance inspection module 34 as an example, the two image sensors used to inspect the front 511 and back 515 of the battery cell 400 under test in the large-area appearance inspection module 34 can be centrally arranged around the battery cell 400 under test. In this way, the two image sensors can be centrally arranged to form an inspection station, which helps to reduce the size of the automated optical inspection equipment. Simultaneously, when the calibration piece 51 moves to the corresponding inspection station, the two image sensors located in different positions can simultaneously photograph the front 511 and back 515 of the calibration piece 51, thereby improving the efficiency of image sensor calibration. Similarly, Figure 3 Multiple image sensors in different orientations within the side appearance inspection module 22, used to inspect the side 513 of the battery cell 400 under test, can also be centrally located on the side 513 of the battery cell 400 under test to form an inspection station for inspecting the side of the battery cell 400 under test. Figure 4 The multiple image sensors in different orientations within the top surface appearance inspection module 33, used to inspect the top surface 512 of the battery cell 400 under test, can also be centrally located on the top of the battery cell 400 to form an inspection station for inspecting the top surface of the battery cell 400 under test. Further details will not be provided here.

[0054] Among them, such as Figure 5 and Figure 6 As shown, multiple inspection sections 514 on the same surface of the inspection calibration component 51 can have different preset height differences, and these different preset height differences are all set with this surface as a reference. For example, five inspection sections 514 can be provided on the front surface 511 of the inspection calibration component 51, and the five inspection sections 514 are recessed to different depths with the front surface 511 as a reference. When the image sensor takes a picture of the front surface 511, the image sensor can capture the image depth values ​​of the five different inspection sections 514 respectively, and compare them with the actual depth values ​​of the five inspection sections 514, thereby improving the visual accuracy of the image sensor calibration. This application does not impose any special restrictions on the specific number of inspection sections 514 provided on the surface of the inspection calibration component 51 or the specific preset height difference of each inspection section 514.

[0055] In some embodiments, such as Figure 8 As shown, multiple inspection sections 514 located on the same surface of the inspection calibration component 51 can be arranged in an array, and the preset height differences of the multiple inspection sections 514 in the same array are distributed in an arithmetic sequence. For example, five inspection sections 514 can be provided on the top surface 512 of the inspection calibration component 51. The five inspection sections 514 can be arranged in an array along the X direction, and the preset height differences of the five inspection sections 514 along the X direction are 0.1mm, 0.3mm, 0.6mm, 1.0mm and 1.5mm respectively, so that the difference between the preset height differences of two adjacent inspection sections 514 are 0.2mm, 0.3mm, 0.4mm and 0.5mm respectively. The purpose of this design is that after the image sensor captures the image depth values ​​of the five inspection sections 514, it can better match the algorithm of the relevant program in the image sensor, thereby determining the visual accuracy deviation of the image sensor, so as to ensure the accuracy of image sensor calibration from the algorithm. Of course, in other embodiments, depending on the different image sensor algorithms, the preset height differences of the multiple inspection units 514 can also be arranged in an arithmetic sequence. This application does not impose any special restrictions on the specific arrangement of the preset height differences of the multiple inspection units 514.

[0056] In addition, such as Figure 5 and Figure 6As shown, five inspection sections 514 can also be provided on the front side 511 of the inspection and calibration component 51, and the five inspection sections 514 can be arranged in an array along the X direction. Five inspection sections 514 can also be provided on the side side 513 of the inspection and calibration component 51, and the five inspection sections 514 can be arranged in an array along the Z direction. Since different surfaces of the inspection and calibration component 51 have different areas, the multiple inspection sections 514 can be arranged alternately or adjacently on the surface of the inspection and calibration component 51. The larger the area of ​​the multiple inspection sections 514 distributed on the surface of the inspection and calibration component 51, the better it is for improving the accuracy of image sensor calibration. This application does not impose any special restrictions on whether the multiple inspection sections 514 are arranged alternately.

[0057] The above embodiment provides a detailed description of the inspection section 514 structure provided on the inspection and calibration component 51. To enable the inspection and calibration component 51 to be better used for calibrating image sensors, such as... Figure 5 As shown, the cell surface defect inspection device 500 may further include a photosensitive element 52. The photosensitive element 52 may be disposed on at least one of the front surface 511, top surface 512, and side surface 513 of the inspection calibration component 51. The surface of the photosensitive element 52 is provided with a calibration pattern, which can be used to calibrate the image sensor. The image sensor can capture an image of the calibration pattern, and then process and analyze the captured image to obtain the image length value. By comparing the image length value with the actual length value on the calibration pattern, it can be determined whether the image sensor produces a visual accuracy deviation when identifying the length value of the surface defect of the cell 400 under test, thereby improving the accuracy of the image sensor and outputting measurement results such as the three-dimensional morphological differences and geometric tolerance differences of the surface defects of the cell 400 under test more accurately. The material of the photosensitive element 52 may be film or photographic paper, etc., and this application does not impose any special restrictions on the specific material of the photosensitive element 52.

[0058] In some embodiments, such as Figure 5 and Figure 9As shown, the photosensitive element 52 may include a first photosensitive element 521; the calibration pattern on the surface of the first photosensitive element 521 may include multiple cells arranged in an alternating black and white array, each cell having a preset length value. These cells are used to calibrate the length value when the image sensor identifies surface defects in the battery cell 400 under test. At least one first photosensitive element 521 is provided on the front 511, top 512, and side 513 of the inspection calibration component 51. For example, the cell may be a square cell, and the preset side length of the cell can be set according to the required calibration accuracy of the image sensor. The first photosensitive element 521 can be mounted on the surface of the inspection calibration component 51 by pasting or inserting. Taking a preset side length of 2mm for each cell as an example, when the image sensor captures an image of the first photosensitive element 521, if the image length obtained by processing and analyzing five cells in the captured image is 9.9mm, it indicates that the image sensor has a visual error of 0.1mm. In this case, if the required calibration accuracy of the image sensor is higher than 0.1mm, the image sensor needs to be adjusted to meet the calibration accuracy requirements. If the required calibration accuracy of the image sensor is less than 0.1 mm, no adjustment is needed. This application does not impose any special restrictions on the required calibration accuracy of the image sensor or the specific side length of the cells in the calibration pattern.

[0059] In other embodiments, the calibration pattern on the first photosensitive element 521 may further include multiple circles of equal diameter arranged tangentially in an array. Taking a preset diameter of 2mm as an example, when the image sensor captures an image of the first photosensitive element 521, if the image length obtained by processing and analyzing five circles in the captured image is 9.9mm, it indicates a visual error of 0.1mm in the image sensor. In this case, if the required calibration accuracy of the image sensor is higher than 0.1mm, the image sensor needs to be adjusted to meet the calibration accuracy requirements. If the required calibration accuracy of the image sensor is lower than 0.1mm, no adjustment is needed. Furthermore, multiple cells in the calibration pattern may have different preset side lengths, or multiple circles in the calibration pattern may have different preset diameters, allowing the image sensor to capture images with different preset side lengths or preset diameters and compare the captured image length values ​​with the actual length values ​​on the calibration pattern to improve the calibration accuracy of the image sensor. This application does not impose any special limitations on the specific shape of the calibration pattern on the photosensitive element 52.

[0060] In some embodiments, such as Figure 6As shown, the inspection calibration component 51 may include a body portion 501 and an electrode portion 502. The body portion 501 is provided with a front surface 511, a top surface 512, and a side surface 513. The electrode portion 502 is disposed on the top surface of the body portion 501, and a first photosensitive element 521 is connected to the top of the electrode portion 502. When the inspection calibration component 51 moves to the electrode detection module 35 in the automatic optical inspection equipment, the image sensor in the electrode detection module 35 can capture an image of the first photosensitive element 521 on the electrode portion 502. The captured image is then processed and analyzed to obtain an image length value. By comparing the actual length value of the calibration pattern on the first photosensitive element 521 with the processed and analyzed image length value, it can be determined whether the image sensor in the electrode detection module 35 has a visual accuracy deviation. If the image sensor has a visual accuracy deviation, the corresponding image sensor is adjusted to complete the image sensor calibration.

[0061] Among them, such as Figure 5 and Figure 6 As shown, since the area of ​​the top of the pole portion 502 is smaller than the area of ​​the surface of the calibration component 51, the preset length value of the cell in the first photosensitive element 521 at the top of the pole portion 502 can be set to be smaller than the preset length value of the cell in the first photosensitive element 521 on the surface of the body portion 501. For example, the preset length value of the cell in the first photosensitive element 521 at the top of the pole portion 502 can be set to 1 mm, and the preset length value of the cell in the first photosensitive element 521 on the surface of the body portion 501 can be set to 2 mm. By distinguishing the preset length value of the cell in the first photosensitive element 521 on the pole 502 from the preset length value of the cell in the first photosensitive element 521 on the body 501, the image sensor in the pole detection module 35 captures a more accurate image length value when photographing the first photosensitive element 521 on the top of the pole 502, and the image sensors in the side appearance detection module 22, top appearance detection module 33, or large appearance detection module 34 capture a more accurate image length value when photographing the first photosensitive element 521 on the surface of the body 501, thereby improving the calibration accuracy of each image sensor.

[0062] In some embodiments, such as Figure 5 and Figure 10As shown, the photosensitive element 52 may further include a second photosensitive element 522; the calibration pattern on the surface of the second photosensitive element 522 may include multiple grids with different preset grayscale values. The grids are used to calibrate the grayscale values ​​when the image sensor identifies surface defects of the battery cell 400 under test. At least one second photosensitive element 522 is provided on the front surface 511, top surface 512, and side surface 513 of the inspection calibration component 51. For example, the grid may be four grids with a side length of 9mm, and the grayscale values ​​of each grid are 40, 100, 160, and 220, respectively. The image sensor captures images of the second photosensitive element 522. If the image grayscale values ​​obtained through processing and analysis are close to or equal to 40, 100, 160, and 220, it indicates that the accuracy of the image sensor meets the requirements, and no adjustment of the image sensor is needed. Otherwise, the image sensor needs to be adjusted. This application does not impose any special restrictions on the number, shape, or specific grayscale values ​​of the grids in the second photosensitive element 522.

[0063] To better fix the calibration point 51, such as Figure 5 and Figure 6 As shown, the calibration component 51 may also have a clamping portion 53; the calibration component 51 has a back surface 515 opposite to the front surface 511, and the clamping portion 53 is recessed in the front surface 511 and the back surface 515 for clamping by the clamping mechanism in the automatic optical inspection equipment. When clamping the calibration component 51, the clamping mechanism can be positioned by the recessed surface, thereby ensuring a fixed position when clamping any calibration component 51, reducing errors caused by different clamping positions of the calibration component 51 during image sensor calibration. In other embodiments, the clamping portion 53 may also be a protruding structure located on the front and back surfaces of the calibration component 51, and the clamping mechanism may be provided with a concave structure adapted to the protruding structure, thereby clamping the calibration component 51 in a fixed position. Alternatively, the clamping portion 53 may also be a magnetic attraction structure located on the front and back surfaces of the calibration component 51, thereby allowing the clamping mechanism to magnetically attach the calibration component 51 to a fixed position. This application does not impose any special restrictions on the specific structure of the clamping part 53 on the inspection and calibration part 51.

[0064] For the clamping mechanism in the automated optical inspection equipment, it can be configured as a rotary clamping mechanism. This rotary clamping mechanism can clamp and flip the inspection calibration component 51, allowing the inspection section 514, the first photosensitive element 521, and the first photosensitive element 522 on the top surface 512 of the inspection calibration component 51 to face the image sensor in the bottom appearance inspection module 23 used to inspect the bottom surface of the battery cell 400 under test. This allows the inspection section 514, the first photosensitive element 521, and the first photosensitive element 522 on the top surface 512 of the inspection calibration component 51 to also be used to calibrate the image sensor inspecting the bottom surface of the battery cell 400 under test. Furthermore, in other embodiments, if the automated optical inspection equipment does not have a rotary clamping mechanism, a rotatable robotic arm can be installed near the image sensor station to be calibrated. The robotic arm clamps the inspection calibration component 51 and calibrates the image sensor. This application does not impose any special restrictions on whether the automated optical inspection equipment has a rotary clamping mechanism.

[0065] The above embodiments provide a detailed description of the specific structure of the battery cell surface defect inspection device 500. In order to better demonstrate the content of this application, the following embodiments will provide a detailed description of the specific method for calibrating an image sensor using the battery cell surface defect inspection device 500 in an automatic optical inspection equipment.

[0066] 1. Calibrate the image sensor used to test the front 511 and back 515 of the battery cell 400 under test.

[0067] 1. Dynamic Imaging: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the imaging point in the large-area appearance inspection module 34. The image sensor in the large-area appearance inspection module 34 takes one image each of the front 511 and back 515 of the inspection calibration piece 51 to capture the fixed position of a cell in the calibration pattern on the first photosensitive element 521. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the imaging point. The image sensor then takes another image of the fixed position of the captured cell in the calibration pattern. This process is repeated multiple times (e.g., 10 times) to complete the dynamic repeatability inspection verification of the front 511 and back 515.

[0068] 2. Length Measurement: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the large-area appearance inspection module 34. The image sensor in the large-area appearance inspection module 34 takes a picture of the front 511 and back 515 of the inspection calibration piece 51 once each, and captures the preset length value in the marking pattern on the first photosensitive element 521. For example, 2mm (one cell), 4mm (two cells), 6mm (three cells), 8mm (four cells), and 10mm (five cells) in black and white cells, to complete the length measurement inspection and verification of the front 511 and back 515.

[0069] 3. Grayscale Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the large-area appearance inspection module 34. The image sensor in the large-area appearance inspection module 34 takes a picture of the front 511 and back 515 of the inspection calibration piece 51 once, respectively, and captures the preset grayscale values ​​in the four grids on the second photosensitive element 522. For example, 40, 100, 160, and 220. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the shooting point, and captures the preset grayscale values ​​in the four grids on the second photosensitive element 522 again. This process is repeated multiple times (e.g., 10 times) to complete the grayscale inspection verification of the front 511 and back 515.

[0070] 4. Depth Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the large-area appearance inspection module 34. The image sensor in the large-area appearance inspection module 34 takes pictures of the front 511 and back 515 of the inspection calibration piece 51 once each, capturing the preset height difference values ​​on the inspection section 514. For example, 0.1mm, 0.3mm, 0.6mm, 1.0mm, and 1.5mm. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it back to the shooting point, and captures the preset height difference values ​​on the inspection section 514 again. This completes the depth inspection verification of the front 511 and back 515.

[0071] II. Calibration of the image sensor used to detect the top surface 512 of the battery cell under test 400.

[0072] 1. Dynamic imaging: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the imaging point in the top surface appearance inspection module 33. The image sensor in the top surface appearance inspection module 33 takes a picture of the top surface 512 of the inspection calibration piece 51 once to capture a fixed position of a cell in the calibration pattern on the first photosensitive element 521. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the imaging point. The image sensor then takes another picture of the fixed position of the captured cell in the calibration pattern. This process is repeated multiple times (e.g., 10 times) to complete the dynamic repeatability inspection verification of the top surface 512.

[0073] 2. Length Measurement: The clamping mechanism in the automatic optical inspection equipment holds the calibration piece 51 and moves it to the shooting point in the top surface appearance inspection module 33. The image sensor in the top surface appearance inspection module 33 takes a picture of the top surface 512 of the calibration piece 51 once to capture the preset length value in the marking pattern on the first photosensitive element 521. For example, 2mm (one cell), 4mm (two cells), 6mm (three cells), 8mm (four cells), and 10mm (five cells) in black and white cells to complete the length measurement and verification of the top surface 512.

[0074] 3. Grayscale Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the top surface appearance inspection module 33. The image sensor in the top surface appearance inspection module 33 takes a picture of the top surface 512 of the inspection calibration piece 51 to capture the preset grayscale values ​​in the four grids on the second photosensitive element 522. For example, 40, 100, 160, and 220. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the shooting point, and then captures the preset grayscale values ​​in the four grids on the second photosensitive element 522 again. This process is repeated multiple times (e.g., 10 times) to complete the grayscale inspection verification of the top surface 512.

[0075] 4. Depth Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the top surface appearance inspection module 33. The image sensor in the top surface appearance inspection module 33 takes a picture of the top surface 512 of the inspection calibration piece 51 to capture the preset height difference value on the inspection section 514. For example, 0.1mm, 0.3mm, 0.6mm, 1.0mm, and 1.5mm. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the shooting point, and captures the preset height difference value on the inspection section 514 again. This completes the depth inspection verification of the top surface 512.

[0076] III. Calibrate the image sensor used to detect the 513 side of the 400 battery cell under test.

[0077] 1. Dynamic imaging: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the imaging point in the side appearance inspection module 22. The image sensor in the side appearance inspection module 22 takes a picture of the side 513 of the inspection calibration piece 51 once to capture a fixed position of a cell in the calibration pattern on the first photosensitive element 521. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the imaging point. The image sensor then takes another picture of the fixed position of the captured cell in the calibration pattern. This process is repeated multiple times (e.g., 10 times) to complete the dynamic repeatability inspection verification of the side 513.

[0078] 2. Length Measurement: The clamping mechanism in the automatic optical inspection equipment holds the calibration piece 51 and moves it to the shooting point in the side appearance inspection module 22. The image sensor in the side appearance inspection module 22 takes a picture of the side 513 of the calibration piece 51 once to capture the preset length value in the marking pattern on the first photosensitive element 521. For example, 2mm (one cell), 4mm (two cells), 6mm (three cells), 8mm (four cells), and 10mm (five cells) in black and white cells to complete the length measurement and verification of the side 513.

[0079] 3. Grayscale Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the side appearance inspection module 22. The image sensor in the side appearance inspection module 22 takes a picture of the side 513 of the inspection calibration piece 51 to capture the preset grayscale values ​​in the four grids on the second photosensitive element 522. For example, 40, 100, 160, and 220. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the shooting point, and then captures the preset grayscale values ​​in the four grids on the second photosensitive element 522 again. This process is repeated multiple times (e.g., 10 times) to complete the grayscale inspection verification of the side 513.

[0080] 4. Depth Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the side appearance inspection module 22. The image sensor in the side appearance inspection module 22 takes a picture of the side 513 of the inspection calibration piece 51 to capture the preset height difference value on the inspection section 514. For example, 0.1mm, 0.3mm, 0.6mm, 1.0mm, and 1.5mm. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the shooting point, and captures the preset height difference value on the inspection section 514 again. This completes the depth inspection verification of the side 513.

[0081] IV. Calibrate the image sensor used to detect the bottom surface of the 400-cell battery under test.

[0082] 1. Dynamic Imaging: The clamping mechanism in the automatic optical inspection equipment holds the calibration piece 51 and moves it to the imaging point in the bottom appearance inspection module 23. The clamping mechanism also flips the calibration piece 51 so that the top surface 512 faces the image sensor used to inspect the bottom surface of the battery cell 400 under test. The image sensor in the bottom appearance inspection module 23 takes a picture of the top surface 512 once to capture a fixed position of a cell in the calibration pattern on the first photosensitive element 521. Subsequently, the clamping mechanism holds the calibration piece 51, moves it, and returns it to the imaging point. The image sensor then takes another picture of the fixed position of the captured cell in the calibration pattern. This process is repeated multiple times (e.g., 10 times) to complete the dynamic repeatability inspection and verification of the bottom surface.

[0083] 2. Length Measurement: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the bottom appearance inspection module 23. The clamping mechanism also flips the inspection calibration piece 51 so that the top surface 512 faces the image sensor used to inspect the bottom surface of the battery cell 400 under test. The image sensor in the bottom appearance inspection module 23 takes a picture of the top surface 512 once to capture the preset length value in the marking pattern on the first photosensitive element 521. For example, 2mm (one cell), 4mm (two cells), 6mm (three cells), 8mm (four cells), and 10mm (five cells) in black and white cells to complete the length measurement inspection and verification of the bottom surface.

[0084] 3. Grayscale Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the bottom appearance inspection module 23. The clamping mechanism flips the inspection calibration piece 51 so that the top surface 512 faces the image sensor used to inspect the bottom surface of the battery cell 400 under test. The image sensor in the bottom appearance inspection module 23 takes a picture of the top surface 512 once to capture the preset grayscale values ​​in the four grids on the second photosensitive element 522. For example, 40, 100, 160, and 220. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it, and returns it to the shooting point. The preset grayscale values ​​in the four grids on the second photosensitive element 522 are captured again. This process is repeated multiple times (e.g., 10 times) to complete the grayscale inspection verification of the bottom surface.

[0085] 4. Depth Inspection: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the shooting point in the bottom appearance inspection module 23. The clamping mechanism also flips the inspection calibration piece 51 so that its top surface 512 faces the image sensor used to inspect the bottom surface of the battery cell 400 under test. The image sensor in the bottom appearance inspection module 23 takes a picture of the top surface 512 to capture a preset height difference value on the inspection section 514. For example, 0.1mm, 0.3mm, 0.6mm, 1.0mm, and 1.5mm. Subsequently, the clamping mechanism holds the inspection calibration piece 51, moves it back to the shooting point, and captures the preset height difference value on the inspection section 514 again. This completes the depth inspection verification of the bottom surface.

[0086] V. Calibrate the image sensor used to detect the 400 pole of the battery cell under test.

[0087] 1. Static Imaging: The clamping mechanism in the automatic optical inspection equipment holds the inspection calibration piece 51 and moves it to the imaging point in the pole detection module 35. The image sensor in the pole detection module 35 takes a picture of the pole portion 502 of the inspection calibration piece 51 once to capture a fixed position of a cell in the calibration pattern on the first photosensitive element 521. Subsequently, keeping the position of the inspection calibration piece 51 fixed, the image sensor takes multiple pictures (e.g., 10 times) of the fixed position of the captured cell in the calibration pattern to complete the static repeatability inspection verification of the pole portion 502.

[0088] 2. Dynamic Imaging: The clamping mechanism in the automatic optical inspection equipment holds the calibration piece 51 and moves it to the imaging point in the pole detection module 35. The image sensor in the pole detection module 35 takes a picture of the pole portion 502 of the calibration piece 51 once to capture a fixed position of a cell in the calibration pattern on the first photosensitive element 521. Subsequently, the clamping mechanism holds the calibration piece 51, moves it, and returns it to the imaging point. The image sensor then takes another picture of the fixed position of the captured cell in the calibration pattern. This process is repeated multiple times (e.g., 10 times) to complete the dynamic repeatability inspection and verification of the pole portion 502.

[0089] 3. Length Measurement: The clamping mechanism in the automatic optical inspection equipment holds the calibration piece 51 and moves it to the shooting point in the pole detection module 35. The image sensor in the pole detection module 35 takes a picture of the pole portion 502 of the calibration piece 51 once to capture the preset length value in the calibration pattern on the first photosensitive element 521. For example, 2mm (one cell), 4mm (two cells), 6mm (three cells), 8mm (four cells), and 10mm (five cells) in black and white cells to complete the length measurement and verification of the pole portion 502.

[0090] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A device for inspecting surface defects in battery cells, characterized in that, The cell surface defect inspection device is used for calibrating image sensors in automated optical inspection equipment and includes: The calibration component is used to simulate the shape of a standard battery cell. The calibration component has a front, top, and side surfaces that are perpendicular to each other. A calibration part is provided on at least one of the front, top, and side surfaces of the calibration component. The calibration part protrudes or is recessed on the surface of the calibration component with a preset height difference. The calibration part is used to calibrate the image sensor.

2. The apparatus of claim 1, wherein the at least one camera is configured to capture images of the surface of the battery cell at a plurality of different angles. The inspection and calibration component also has a back side opposite to the front side, and two oppositely arranged sides; The inspection calibration piece has multiple inspection sections on its front, back, top, and at least one of its two sides, and the multiple inspection sections located on the same surface have different preset height differences relative to that surface.

3. The apparatus of claim 2, wherein the at least one light source is a laser. The multiple inspection sections on the same surface of the inspection calibration piece are arranged in an array, and the differences in the preset heights of the multiple inspection sections on the same array are distributed in an arithmetic sequence.

4. The apparatus of claim 1, wherein the at least one camera is positioned to capture images of the surface of the battery cell from a direction that is substantially perpendicular to the surface of the battery cell. The cell surface defect inspection device also includes a photosensitive element; The photosensitive element is disposed on at least one of the front, top, and side surfaces of the inspection and calibration component, and the surface of the photosensitive element is provided with a calibration pattern, which is used to calibrate the image sensor.

5. The cell surface defect inspection device as described in claim 4, characterized in that, The photosensitive element includes a first photosensitive element; The calibration pattern on the surface of the first photosensitive element includes multiple cells arranged in an alternating black and white array. Each cell has a preset length value. The cell is used to calibrate the length value when the image sensor identifies surface defects of the battery cell under test. At least one of the first photosensitive elements is provided on the front, top, and side surfaces of the inspection calibration component.

6. The apparatus of claim 5, wherein the at least one of the plurality of electrodes is a first electrode, and the at least one of the plurality of electrodes is a second electrode, and the first electrode and the second electrode are disposed on opposite sides of the cell. The inspection and calibration component includes a body and an electrode post. The main body is provided with a front surface, a top surface and a side surface, the pole part is provided on the top surface of the main body, and the first photosensitive element is connected to the top of the pole part.

7. The apparatus of claim 6, wherein the at least one light source is a laser. The preset length value of the cell in the first photosensitive element at the top of the pole portion is less than the preset length value of the cell in the first photosensitive element on the surface of the body portion.

8. The cell surface defect inspection device as described in claim 4, characterized in that, The photosensitive element includes a second photosensitive element; The calibration pattern on the surface of the second photosensitive element includes multiple grids with different preset gray values. The grids are used to calibrate the gray values ​​when the image sensor identifies surface defects of the battery cell under test. At least one second photosensitive element is provided on the front, top, and side surfaces of the inspection calibration component.

9. The apparatus according to any one of claims 1 to 8, wherein The inspection and calibration component also has a clamping part; The inspection and calibration component also has a back side opposite to the front side, and the clamping portion is recessed in the front side and the back side for clamping by the clamping mechanism in the automatic optical inspection equipment.

10. An inspection device characterized by comprising: include: The cell surface defect inspection device according to any one of claims 1 to 9; as well as, An automatic optical inspection device has multiple inspection stations, each of which is equipped with multiple image sensors located at different positions. The multiple image sensors located at different positions are used to capture images of the surface defects of the battery cell.

Images