Battery appearance detection equipment and battery appearance detection method

Abstract

The invention provides battery appearance detection equipment and a battery appearance detection method. The equipment comprises a feeding detection station, a second detection station and a third detection station, the feeding detection station is used for feeding code reading, two-dimensional code detection, explosion-proof valve detection and pole side surface detection of batteries; the second detection station is used for small surface detection, short side edge eight-side edge detection and large surface detection of the battery, and the small surface detection, short side edge top and bottom eight-side edge detection and large surface detection all comprise 2.5 D scanning and 3D scanning; the third detection station is used for pressure PPG thickness measurement, top surface detection, vertex angle detection and pole top surface detection of the battery; according to the scheme, full detection of six surfaces, eight corners, twelve edges, two-dimensional codes, anti-explosion valves and poles of the batteries is achieved, intelligent detection of the batteries is achieved, the method can adapt to appearance detection of the batteries of different models, and the labor cost is reduced; the method can be popularized and applied to scenes needing optical detection, such as energy storage batteries and power batteries.

Description

Technical Field

[0001] This invention belongs to the field of battery testing, specifically relating to a battery appearance testing device and a battery appearance testing method. Background Technology

[0002] Existing small and medium-sized energy storage batteries (see) Figure 1 The current method still relies on manual inspection or basic 2D visual inspection. Manual inspection is easily affected by subjective fatigue and experience differences, with a false negative rate as high as 3%-5%, and it is completely unsuitable for high-speed production lines. 2D visual inspection is difficult to deal with the interference caused by the complex materials of batteries. For example, as a highly reflective material, the blue film has inconspicuous defects such as bubbles and wrinkles on its surface. At the same time, 2D technology cannot obtain the height information of defects such as weld slag and bumps, resulting in high over-detection and false negative rates.

[0003] While advanced technologies such as 3D vision and AI deep learning can improve inspection accuracy, the equipment costs are high. For example, high-precision 3D structured light cameras are expensive and difficult to widely adopt. At the same time, 3D inspection solutions generally suffer from slow inspection speeds, while energy storage battery production lines operate at high speeds. After deducting the time for mechanical actions, the time left for software inspection is extremely short. The compatibility of 3D technology with high-speed production lines is difficult, making it hard to balance accuracy and efficiency.

[0004] While advanced non-destructive testing technologies such as X-ray CT and micro-CT exist internationally, enabling the detection of internal defects at micron-level resolution, such as electrode misalignment and dendrite growth, these devices are expensive to manufacture and maintain, hindering large-scale deployment. Furthermore, dynamic testing technologies like real-time X-ray imaging are primarily used in R&D or high-end mass production lines, lacking adaptability to conventional energy storage battery production lines and subject to stringent environmental requirements and external interference.

[0005] As a component of energy security, the appearance of energy storage batteries is a critical factor affecting quality, delivery, and safety. To improve the appearance quality of energy storage batteries, a battery appearance inspection system needs to be designed to enhance intelligence and automation while reducing manual labor. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a battery appearance inspection device and a battery appearance inspection method, which can solve the above-mentioned problems.

[0007] Design Principles: ① A combined 2D and high-precision 3D inspection scheme is adopted. The 3D system uses a high-precision laser sensor, achieving a detection accuracy of up to 10μm for weld slag, bumps, and pits, ensuring the detection of defects as small as 0.1mm. ② Improved adaptability allows the same equipment to inspect batteries of various specifications. ③ A linear layout is adopted, divided into left and right channels, each further divided into two fixtures. Three inspection stations perform full inspection of the product's six sides / octagons / dodecagons / QR codes / explosion-proof valves / terminals, etc. A high-precision 3D line laser is designed to re-evaluate the height of product defects and simultaneously inspect the product's length and width dimensions. A PPG thickness measurement station is designed to perform pressure-holding thickness measurement according to battery process requirements. The overall scheme is as follows.

[0008] A battery appearance inspection device includes a loading inspection station, a second inspection station, and a third inspection station. The loading inspection station is used for battery loading, barcode reading, QR code detection, explosion-proof valve detection, and terminal post side inspection. The second inspection station is used for small-face inspection, short-side eight-sided edge inspection, and large-face inspection of the battery. The small-face inspection, short-side top and bottom eight-sided edge inspection, and large-face inspection all include 2.5D scanning and 3D scanning. The third inspection station is used for battery pressure PPG thickness measurement, top surface inspection, top corner inspection, and terminal post top surface inspection. The device is based on a deep framework of a large sample model and combines 2D defects with 3D height re-judgment to achieve full inspection of the battery's six sides, octagons, twelve edges, QR codes, explosion-proof valves, and terminals.

[0009] Furthermore, the equipment also includes a sorting and unloading station, which includes an unloading transfer module, a sorting and handling module, an NG unloading and storage module, and an OK grading and storage module; the sorting and unloading station realizes automatic sorting and unloading based on the product inspection results.

[0010] Furthermore, the feeding and inspection station includes an infeed docking conveyor module, a feeding inspection conveyor module, an infeed handling module, a barcode scanning explosion-proof valve inspection module, and a terminal side inspection module. The infeed handling module is located across both sides of the upstream end of the feeding inspection conveyor module and is used to transport batteries from the infeed docking conveyor module to the feeding inspection conveyor module. The barcode scanning explosion-proof valve inspection module is located across both sides of the feeding inspection conveyor module and is arranged adjacent to the infeed handling module. It is used for battery feeding barcode reading, QR code detection, and explosion-proof valve detection. The terminal side inspection module is located across both sides of the middle and downstream of the feeding inspection conveyor module and uses a four-sided camera to conduct optical image inspection of the terminal side.

[0011] Furthermore, the second inspection station includes a battery flattening module, a small-face inspection module, a battery uprighting module, and a large-face inspection module. The battery flattening module is used to flip the vertically placed battery from upstream and flatten it, then transport it to the small-face inspection position. The small-face inspection module includes a 2.5D line scan camera unit, a small-face 3D line laser, and a side-edge 3D line laser, used to inspect the four sides of the battery and adjacent side edges. The battery uprighting module is used to flip the horizontal battery upright and vertically, then transport it to the large-face inspection position. The large-face inspection module includes a 2.5D line scan camera unit and a large-face 3D line laser, used to inspect the two large faces of the battery.

[0012] Furthermore, the third inspection station includes a thickness measurement module, a rotating sliding platform, a corner detection module, a side edge laser inspection module, and a terminal top inspection module. The thickness measurement module uses pressure PPG to measure the battery thickness. The rotating sliding platform supports the horizontal movement and in-plane rotation of the vertically placed battery. The corner detection module includes two sets of corner inspection CCD units arranged diagonally opposite each other on the outside of the sliding line of the rotating sliding platform. The side edge laser inspection module includes a set of side edge inspection 3D line laser units arranged diagonally opposite each other. The terminal top inspection module uses a vertically downward-facing terminal top inspection CCD unit.

[0013] Furthermore, the third testing station also includes a material unloading and transfer module. The material unloading and transfer module uses two battery clamping platforms with adjustable distances between them, which are set on the sliding line to transport the tested batteries downstream with adjustable distances between them.

[0014] This invention also provides a battery appearance inspection method, comprising the following steps: S1, loading the battery onto a feeding conveyor belt; S2, QR code reading and CCD detection; S3, explosion-proof valve CCD detection; S4, terminal post side inspection; S5, transferring the battery to the small-face inspection station, flipping the battery from a standing position to a lying position; S6, four small faces, short sides, and the lying side edge inspection, performing 2.5D scanning and 3D scanning; S7, transferring the battery to the large-face inspection station, flipping the battery from a lying position to a standing position; S8, double large-face 2.5D scanning. S9. Battery thickness is measured by pressure PPG; S10. The battery is transported to the top inspection station while maintaining its upright position; S11. Eight-corner inspection, front of the terminal post and standing side edge inspection; S12. The battery is transported to the buffer station; S13. Appearance and size inspection OK / NG sorting, NG products flow to NG discharge conveyor belt; S14. Appearance and size inspection OK products are sorted according to the inspection results of the previous machine and flow to the sorting conveyor belt; S15. The battery transport module unloads OK batteries into the tray.

[0015] Compared to existing technologies, the advantages of this invention are as follows: It introduces an appearance inspection machine, which improves battery appearance quality through automation, promotes production line process optimization, increases battery yield, helps customers standardize supplier shipments, and allows both OQC and IQC to use the same inspection standard appearance inspection machine. This reduces manual workload and labor costs, further lowering battery manufacturing costs and solving technical challenges in the industry. The solution presented in this application can be widely applied in scenarios requiring optical inspection of surfaces, edges, and special locations such as QR codes and explosion-proof valves, such as energy storage batteries and power batteries. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an energy storage battery; Figure 2 This is a schematic diagram of a battery appearance inspection device. Figure 3 and Figure 4 This is a schematic diagram of the material loading and inspection station; Figure 5 and Figure 6 This is a schematic diagram of the second testing station; Figure 7 and Figure 8 This is a schematic diagram of the third testing station; Figure 9 and Figure 10 This is a schematic diagram of the sorting and unloading station; Figure 11 This is a flowchart illustrating the battery appearance inspection method. Figure 12 This is a schematic diagram of the steps in the battery appearance inspection method corresponding to the battery appearance inspection equipment. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be understood that the terms "system," "device," "unit," and / or "module" as used in this specification are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0019] Flowcharts are used in this specification to illustrate the operations performed by the system according to embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0020] Appearance inspection equipment A battery appearance inspection device, see Figures 1-10 and Figure 12 The equipment includes a 1000-unit feeding and testing station, a 2000-unit second testing station, a 3000-unit third testing station, and a 4000-unit sorting and unloading station.

[0021] The first inspection station (station 1000) is used for battery loading, barcode reading, QR code detection, explosion-proof valve detection, and terminal post side detection. The second inspection station (station 2000) is used for small-face detection, short-side eight-sided edge detection, and large-face detection of batteries. The small-face detection, short-side top and bottom eight-sided edge detection, and large-face detection all include 2.5D scanning and 3D scanning. The third inspection station (station 3000) is used for battery pressure PPG thickness measurement, top surface detection, top corner detection, and terminal post top surface detection. The equipment is based on a deep framework of a large sample model and combines 2D defects with 3D height re-judgment to achieve full detection of the battery's six sides, eight corners, twelve edges, QR codes, explosion-proof valves, and terminals.

[0022] Referring to the attached diagram, the material loading and testing station 1000, the second testing station 2000, and the third testing station 3000 adopt two channels on the left and right sides. Each channel is further divided into two rows of fixture conveying flow lines, which improves the overall testing efficiency. The width of the fixtures and flow lines is adjustable. Alternatively, by simply adjusting the product handling grippers, fixtures, and movement points, it can be switched to another battery model, making the equipment solution highly versatile.

[0023] Of course, a circular streamlined layout can also be used to reduce the length space occupied. This application prioritizes the straight-line layout shown in the figure.

[0024] Among them, see Figure 3 and Figure 4The feeding and inspection station 1000 includes an infeed docking conveyor module 1100, a feeding and inspection conveyor module 1200, an infeed handling module 1300, a barcode scanning explosion-proof valve inspection module 1400, and a terminal side inspection module 1500. The infeed handling module 1300 is located on both sides of the upstream end of the feeding and inspection conveyor module 1200 and is used to transport the batteries from the infeed docking conveyor module 1100 to the feeding and inspection conveyor module 1200. The barcode scanning explosion-proof valve inspection module 1400 is located on both sides of the feeding and inspection conveyor module 1200 and is arranged adjacent to the infeed handling module 1300. It is used for battery feeding barcode reading, QR code detection, and explosion-proof valve detection. The terminal side inspection module 1500 is located on both sides of the middle and downstream of the feeding and inspection conveyor module 1200 and uses a four-sided camera to detect optical images of the terminal side.

[0025] In this specific example, the battery QR code is read and detected using a QR code CCD camera, the explosion-proof valve uses an explosion-proof valve CCD camera, and the terminal post sides use four terminal post side CCD cameras. The QR code CCD camera and the explosion-proof valve CCD camera are located on the front and rear sides of the mounting bracket. Of course, other forms of scanning and detection methods can also be used to acquire images.

[0026] The feeding and testing station 1000 also includes a belt line positioning module 1600, which is used to correct and reset misaligned batteries on the belt line.

[0027] The feeding inspection station 1000 also includes an infeed dust removal module 1700, used for surface dust removal of the batteries on the infeed docking conveyor module 1100. Dust removal methods include plasma air knife dust removal and vacuum adsorption dust removal. The infeed dust removal module 1700 is positioned above the infeed docking conveyor module 1100; in a specific example, the dust removal unit is fixedly supported by a dust removal frame.

[0028] See Figure 5 and Figure 6 The second testing station 2000 includes a battery flattening module 2100, a small-face testing module 2200, a battery uprighting module 2300, and a large-face testing module 2400.

[0029] Specifically, the battery flattening module 2100 is used to flip the vertically placed battery upside down and flatten it, and transport it to the small surface detection position; the small surface detection module 2200 includes a 2.5D line scan camera unit, a small surface 3D line laser and a side edge 3D line laser, used to detect the four sides of the battery and adjacent side edges; the battery uprighting module 2300 is used to flip the horizontal battery upright and vertically, and transport it to the large surface detection position; the large surface detection module 2400 includes a 2.5D line scan camera unit and a large surface 3D line laser, used to detect the two large surfaces of the battery.

[0030] Furthermore, a horizontal rotating platform 2500 is set at the small-area detection position, and a lifting adsorption platform 2600 is set at the large-area detection position to cooperate with the battery support and positioning at the corresponding work positions.

[0031] Furthermore, the battery flattening module 2100 and the battery uprighting module 2300 are horizontally slidably suspended on the gantry carriage 2700, and both the battery flattening module 2100 and the battery uprighting module 2300 adopt a gripper mechanism, and the gripper mechanism of the battery flattening module 2100 is equipped with a rotary drive unit.

[0032] The third testing station 3000 includes a thickness measurement module 3100, a rotating sliding stage 3200, an angle detection module 3300, a side edge laser inspection module 3400, and a terminal top inspection module 3500. The thickness measurement module 3100 uses pressure PPG to measure the battery thickness. The rotating sliding stage 3200 supports the horizontal movement and in-plane rotation of the vertically placed battery. The angle detection module 3300 includes two sets of angle inspection CCD units arranged diagonally opposite each other on the outside of the sliding line of the rotating sliding stage 3200. The side edge laser inspection module 3400 includes a set of side edge inspection 3D line laser units arranged diagonally opposite each other. The terminal top inspection module 3500 uses a vertically downward-facing terminal top inspection CCD unit.

[0033] Furthermore, the third testing station 3000 also includes a material unloading and transfer module 3600. The material unloading and transfer module 3600 uses two battery clamping platforms with adjustable distances between them, which are set on the sliding line to transport the tested batteries downstream with adjustable distances between them.

[0034] The sorting and unloading station 4000 includes an unloading transfer module 4100, a sorting and handling module 4200, an NG unloading and storage module 4300, and an OK grading and storage module 4400; the sorting and unloading station 4000 automatically sorts and unloads materials based on the product inspection results.

[0035] See specific examples. Figure 9 The sorting and handling module 4200 uses a multi-axis robotic arm, such as the KAKU six-axis robot. A gantry crane mechanism can also be used; for details on using a gantry crane mechanism, please refer to [link / reference needed]. Figure 10 A sorting and conveying flow line of 4500 from front to back also needs to be set up.

[0036] The NG discharge storage module 4300 and the OK bin storage module 4400 adopt an automatic foam tray changing system, which automatically bins and loads products onto trays, further saving manpower for manual material collection.

[0037] Appearance inspection methods See Figure 11 and Figure 12A battery appearance inspection method, implemented based on the aforementioned battery appearance inspection equipment, includes the following steps.

[0038] S1. Loading: The battery is placed on the feeding conveyor belt; see below. Figure 12 ① In this case, the feed conveyor belt connects to the front machine, and four products are fed in at a time.

[0039] S2, QR code reading and CCD detection; see also Figure 12 In step ②, the product undergoes QR code reading and detection via a QR code CCD when passing through step ②.

[0040] S3, explosion-proof valve CCD testing; product has undergone... Figure 12 At point ③, the explosion-proof valve is optically inspected using a CCD sensor.

[0041] S4, End post side inspection; Product undergoes... Figure 12 At point ④, the CCD on the side of the electrode post takes a picture of the side of the electrode post for detection.

[0042] S5. The battery is moved to the small-area inspection station. (See below) Figure 12 At point ⑤, the battery flips from a standing position to a lying position, that is, from a vertical standing position to a horizontal lying position. S6, four small faces, short sides, and flat-lying side edge inspection, the product undergoes... Figure 12 At point ⑥, 2.5D and 3D scans were performed.

[0043] S7. The battery is moved to the large-area inspection station. (See below) Figure 12 At point ⑦, the battery flips from a lying position to a standing position.

[0044] S8, double-sided 2.5D scanning, and 3D scanning, see [link / reference]. Figure 12 At point ⑧, the two large surfaces of the battery are used to detect its standing posture.

[0045] S9, Pressure PPG measurement of battery thickness, see [link / reference] Figure 12 At point ⑨, the battery is placed in the thickness measurement module 3100 of the third testing station 3000 for PPG pressure thickness measurement.

[0046] S10. The battery is moved to the top inspection station. (See below) Figure 12 At point ⑩, the battery remains upright.

[0047] S11, eight-corner inspection, terminal post front and standing side edge inspection, battery transported to Figure 12 ⑪ The corner, side edge, and front of the battery are detected when the battery is in a standing position using the corner detection module 3300, the side edge laser detection module 3400, and the terminal top detection module 3500.

[0048] S12. The battery is moved to the buffer station. (See below) Figure 12 At point ⑫, the tested batteries are transported to a buffer area to await sorting and unloading.

[0049] S13. Appearance and size inspection OK / NG classification, see [link / reference] Figure 12 The appearance and size inspection at point 13 leads to the NG product flow onto the NG discharge conveyor belt; S14. Products that pass the appearance and size inspection are categorized according to the results of the previous inspection. See [link / reference] Figure 12 At point ⑭, the batteries flow to the sorting belt or are picked up and transferred by a robotic arm.

[0050] S15. The battery handling module unloads the OK batteries into the tray. (See below) Figure 12 At point ⑮, items that are OK in appearance and size are sorted and transported to the corresponding OK trays according to their OK grade.

[0051] The key technologies of the overall solution include the following three points.

[0052] (1) Optical design: It adopts a combination of 2D and 2.5D industrial CCD, and high-precision 3D line laser full-coverage scanning at the micron and submicron levels to achieve all-round detection of the six sides, octagons, and dodecagons of the blue film, the front / side of the pole, the exterior / interior of the explosion-proof valve, and the QR code.

[0053] (2) Overall efficiency: CT can reach up to 20ppm. The feeding design is an automatic packaging device. OK products can be divided into 5 levels (other levels can also be set as needed) for automatic tray loading / replacing.

[0054] (3) Detection capability: The applicant adopts a technology platform developed independently, uses a deep learning architecture with a large sample model, and combines it with traditional algorithms. The pass rate can reach within 5%, the miss rate can reach within 0.3%, and the defect items of security-related issues can be guaranteed to have 0 misses.

[0055] Innovations of the solution.

[0056] Innovation Point 1: Innovatively using a high-precision line laser displacement sensor with 4K / 6K points (point cloud density of 5μm), it is the first to combine 2D defects with 3D height reassessment for result output.

[0057] Innovation Point 2: Three sets of six-axis robots, which can handle both foam tray changing and automatic binning of products into trays, and achieve a CT efficiency of 3 seconds / piece.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery appearance inspection device, characterized in that: The equipment includes a material feeding and testing station (1000), a second testing station (2000), and a third testing station (3000). The loading and testing station (1000) is used for battery loading, code reading, QR code detection, explosion-proof valve detection, and terminal side detection; The second testing station (2000) is used for small-face testing, short-side eight-sided edge testing and large-face testing of batteries. Among them, small-face testing, short-side top and bottom eight-sided edge testing and large-face testing all include 2.5D scanning and 3D scanning. The third testing station (3000) is used for battery pressure PPG thickness measurement, top surface inspection, top corner inspection and terminal top surface inspection; The equipment is based on a deep framework of large sample models and combines 2D defects with 3D height re-judgment to achieve full inspection of the battery's six sides, octagons, dodecagons, QR codes, explosion-proof valves, and terminals.

2. The battery appearance inspection device according to claim 1, characterized in that: The equipment also includes a sorting and unloading station (4000), which includes an unloading transfer module (4100), a sorting and handling module (4200), an NG unloading and storage module (4300), and an OK grading and storage module (4400). The sorting and unloading station (4000) automatically sorts and unloads materials based on the product testing results.

3. The battery appearance inspection device according to claim 1, characterized in that: The feeding and inspection station (1000) includes an infeed docking conveyor module (1100), a feeding inspection conveyor module (1200), an infeed handling module (1300), a barcode scanning explosion-proof valve inspection module (1400), and a terminal post side inspection module (1500). The infeed handling module (1300) is positioned across both sides of the upstream end of the feeding inspection conveyor module (1200) and is used to handle the batteries from the infeed docking conveyor module (1100). The loading inspection conveyor module (1200) is used for loading and inspecting the battery; the barcode scanning explosion-proof valve detection module (1400) is arranged across both sides of the loading inspection conveyor module (1200) and adjacent to the feeding and handling module (1300), and is used for battery loading barcode reading, QR code detection and explosion-proof valve detection; the terminal side detection module (1500) is arranged across the middle and lower downstream sides of the loading inspection conveyor module (1200), and uses four cameras to detect optical images of the terminal side.

4. The battery appearance inspection device according to claim 1, characterized in that: The second testing station (2000) includes a battery flattening module (2100), a small-face testing module (2200), a battery uprighting module (2300), and a large-face testing module (2400). The battery flattening module (2100) is used to flip the vertically placed battery upstream to flatten it and transport it to the small face detection position; The facet detection module (2200) includes a 2.5D line scan camera unit, a facet 3D line laser, and a side edge 3D line laser for detecting the four sides of the battery and adjacent side edges. The battery uprighting module (2300) is used to upright the horizontal battery and transport it to the large-area detection position; The large-area inspection module (2400) includes a 2.5D line scan camera unit and a large-area 3D line laser for inspecting two large areas of the battery.

5. The battery appearance inspection device according to claim 4, characterized in that: A horizontal rotating platform (2500) is set at the small surface detection position, and a lifting adsorption platform (2600) is set at the large surface detection position to cooperate with the battery support and positioning at the corresponding workstation.

6. The battery appearance inspection device according to claim 4, characterized in that: The battery flattening module (2100) and the battery uprighting module (2300) are horizontally slid and suspended on the gantry carriage (2700). Both the battery flattening module (2100) and the battery uprighting module (2300) adopt a gripper mechanism, and the gripper mechanism of the battery flattening module (2100) is equipped with a rotary drive unit.

7. The battery appearance inspection device according to claim 1, characterized in that: The third inspection station (3000) includes a thickness measurement module (3100), a rotating sliding stage (3200), an angle detection module (3300), a side edge laser inspection module (3400), and a terminal top inspection module (3500). The thickness measurement module (3100) uses pressure PPG to measure the battery thickness. The rotating sliding stage (3200) supports the horizontal movement and in-plane rotation of the vertically placed battery. The angle detection module (3300) includes two sets of angle inspection CCD units arranged diagonally opposite each other on the outside of the sliding line of the rotating sliding stage (3200). The side edge laser inspection module (3400) includes a set of side edge inspection 3D line laser units arranged diagonally opposite each other. The terminal top inspection module (3500) uses a vertically downward-facing terminal top inspection CCD unit.

8. The battery appearance inspection device according to claim 7, characterized in that: The third testing station (3000) also includes a material unloading and transfer module (3600). The material unloading and transfer module (3600) uses two battery clamping platforms with adjustable distances between them, which are set on the sliding line to transport the tested batteries downstream with adjustable distances between them.

9. A battery appearance inspection method implemented using the battery appearance inspection equipment according to any one of claims 1-8, characterized in that the method... include: S1. Loading: The battery is placed on the feeding conveyor belt. S2, QR code reading and CCD detection; S3, Explosion-proof valve CCD testing; S4. Side inspection of the pole post; S5. The battery is moved to the small-scale inspection station, and the battery is flipped from a standing position to a lying position. S6, four small faces, short sides and flat side edges are inspected, and 2.5D and 3D scans are performed; S7. The battery is moved to the large-area inspection station, and the battery is flipped from a lying position to a standing position. S8, dual-plane 2.5D scanning and 3D scanning; S9, Pressure PPG measurement of battery thickness; S10. The battery is moved to the top inspection station while maintaining its upright position. S11, Eight-corner detection, front and standing side edge detection of pole post; S12, The battery is moved to the buffer station; S13. Appearance and size inspection OK / NG classification, appearance and size inspection NG products flow to NG discharge conveyor belt; S14. Products that pass the appearance and size inspection are graded according to the inspection results of the previous machine and flow to the sorting belt. S15, The battery handling module unloads the OK batteries into the tray.

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