Square battery visual inspection method and system

Abstract

The invention discloses a square battery visual inspection method and system. The device comprises a feeding conveying line and a discharging conveying line, the feeding conveying line is sequentially provided with large end face detection equipment and top face and bottom face detection equipment, and the discharging conveying line is provided with small end face detection equipment; transverse moving carrying equipment is arranged at the tail end of the feeding conveying line and the head end of the discharging conveying line. According to the invention, the problems of inaccurate manual visual inspection of battery defects and manpower consumption in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a method and system for visual inspection of square batteries. Background Technology

[0002] Square batteries require insulating properties on their surface. To address this, two solutions exist: coating with a blue film and spraying an insulating coating. Current technology involves visually inspecting the sprayed insulating coating, which suffers from low inspection efficiency, high labor intensity, and poor economic viability. A similar technology involves inspecting the blue film on the battery surface. Defects in the blue film mainly include bulges, scratches, damage, and foreign matter. Related patents for this method can be found in CN117911420B, CN116087218B, and CN116626053B, while related equipment patents can be found in CN118914075A and CN220137015U.

[0003] The purpose of testing blue film and surface coating is the same: to ensure the insulation performance of the battery surface by detecting surface defects. The difference lies in the content of the test and the focus, as well as the methods and solutions to solve the problem.

[0004] Currently, there are no publicly available methods or devices for visual inspection of battery coatings, and manual visual inspection is the primary method. This invention uses an online visual inspection method to identify defects such as pinholes, scratches, and bubbles on the battery surface, reducing the workload for workers. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for visual inspection of square batteries, so as to solve the problems of inaccuracy and high manpower consumption in manual visual inspection of batteries in related technologies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A visual inspection system for square batteries includes: a feeding conveyor line and a discharging conveyor line. The feeding conveyor line is equipped with a large end face inspection device and a top and bottom end face inspection device in sequence, and the discharging conveyor line is equipped with a small end face inspection device. A transverse conveying device is arranged at the tail end of the feeding conveyor line and the head end of the discharging conveyor line.

[0008] Further configuration: a feeding barcode scanner is installed at the beginning of the feeding conveyor line; a discharging barcode scanner is installed at the end of the discharging conveyor line.

[0009] Further configuration: a four-to-one lane divider is fixedly connected to the tail end of the feeding conveyor line, and a transverse conveying device is located above the four-to-one lane divider and above the head end of the unloading conveyor line.

[0010] The device is further configured such that the large end face inspection equipment, the top and bottom end face inspection equipment, and the small end face inspection equipment are all composed of dome-shaped light-emitting devices, line scan cameras, and supports; the support of the large end face inspection equipment has two dome-shaped light-emitting devices and line scan cameras arranged opposite each other, with the parallel plane of the dome-shaped light-emitting devices perpendicular to the ground; the support of the top and bottom end face inspection equipment has two dome-shaped light-emitting devices and line scan cameras arranged opposite each other, with the parallel plane of the dome-shaped light-emitting devices parallel to the ground; the support of the small end face inspection equipment has two dome-shaped light-emitting devices and line scan cameras arranged opposite each other, with the parallel plane of the dome-shaped light-emitting devices perpendicular to the ground.

[0011] Further configuration: The feeding conveyor line includes an inlet keel chain conveyor and an outlet keel chain conveyor, with two clamping conveyors installed between the inlet keel chain conveyor and the outlet keel chain conveyor.

[0012] Further configuration: The transverse transport equipment includes a gantry, a horizontal moving shaft and a vertical moving shaft, with the vertical moving shaft mounted on the horizontal moving shaft; a drag chain is mounted on the horizontal moving shaft, and a maintenance pin is mounted at the end of the horizontal moving shaft.

[0013] Further configuration: The vertical moving axis is equipped with a maintenance pin socket and a battery cell clamp.

[0014] To achieve the above objectives, the present invention adopts the following technical solution:

[0015] A method for visual inspection of square batteries includes: scanning the QR code of the square battery using an infeed scanning device to obtain QR code information; obtaining surface state information of the square battery, wherein the surface state information of the square battery includes surface state information of the two large end faces, the top and bottom faces, and the two small end faces; binding the QR code information and the surface state information of the square battery; and scanning the QR code of the square battery again using an unloading scanning device to remove square batteries with abnormal surface state information.

[0016] The method is further configured as follows: images of the two large end faces of the square battery are acquired using a large end face detection device, and surface state information of the two large end faces is obtained through visual processing. The surface state information includes two-dimensional image information and three-dimensional image information; images of the top and bottom surfaces of the square battery are acquired using a top and bottom surface detection device, and surface state information of the top and bottom surfaces is obtained through visual processing; images of the two small end faces of the square battery are acquired using a small end face detection device, and surface state information of the two small end faces is obtained through visual processing.

[0017] Further configuration: After obtaining the surface condition information of the two large end faces, the surface condition of the top face and the bottom face on the feeding conveyor line, the square battery is transported to the four-to-one separation equipment; the transverse transfer equipment transports the square battery to the unloading conveyor line.

[0018] Compared to existing technologies, the beneficial effects of this invention are: precise detection of the entire surface without blind spots. It adopts a separate layout for the feeding and unloading lines, coupled with three types of dedicated detection equipment, covering all six surfaces of the battery; combining two-dimensional and three-dimensional image collaborative analysis, it accurately distinguishes between planar defects such as scratches and dents and three-dimensional defects such as shrinkage cavities and bubbles, significantly reducing the rate of missed and false detections. Through a four-to-one split-channel device integrating multiple feeding routes, and lateral transport equipment achieving seamless and precise cross-line transfer; maintaining battery stability during transfer to avoid secondary damage, while adapting to the dynamic balance of the production line cycle, improving overall processing efficiency. Full lifecycle traceability and control. The feeding and unloading barcode scanning equipment constructs a one-item-one-code system, binding full-surface detection data to achieve precise defect tracing; secondary barcode scanning verification during unloading automatically removes abnormal products, forming a closed-loop quality control system, reducing quality risks and rework costs. The separate line layout and modular design reduce equipment interference and improve system operational reliability; reserved expansion space allows for adaptation to different battery specifications and capacity upgrades, while supporting data-driven process optimization and adapting to intelligent production needs. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is the front view of the present invention;

[0022] Figure 3 This is a side view of the present invention;

[0023] Figure 4 This is a schematic diagram of the conveyor line of the present invention;

[0024] Figure 5 This is a top view of the conveyor line of the present invention;

[0025] Figure 6 This is a schematic diagram of the large end face inspection device of the present invention;

[0026] Figure 7 This is a front view of the large end face inspection device of the present invention;

[0027] Figure 8 This is a schematic diagram of the top and bottom surface detection device of the present invention;

[0028] Figure 9This is a front view of the top and bottom surface detection device of the present invention;

[0029] Figure 10 This is a schematic diagram of the small end face detection device of the present invention;

[0030] Figure 11 This is a front view of the small end face detection device of the present invention;

[0031] Figure 12 This is a schematic diagram of the transverse transport device of the present invention.

[0032] Reference numerals: 1. Feeding and barcode scanning equipment; 101. Inlet keel chain conveyor; 102. Outlet keel chain conveyor; 103. Clamping conveyor; 2. Square battery; 3. Large end face inspection equipment; 301. Line array camera; 302. Dome lighting device; 303. Support frame; 4. Top and bottom surface inspection equipment; 5. Feeding conveyor line; 6. Lateral transport equipment; 601. Gantry frame; 602. Vertical moving shaft; 603. Horizontal moving shaft; 604. Cable drag chain; 605. Maintenance pin; 606. Maintenance pin socket; 607. Battery cell gripper; 7. Small end face inspection equipment; 8. Unloading conveyor line; 9. Unloading and barcode scanning equipment; 10. Four-to-one lane separation equipment. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described 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.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Example

[0037] Reference Figures 1-5 This invention discloses a visual inspection system for square batteries. The invention includes: a feeding conveyor line 5 and a discharging conveyor line 8. The feeding conveyor line 5 is sequentially equipped with a large end face inspection device 3 and a top and bottom surface inspection device 4. The discharging conveyor line 8 is equipped with a small end face inspection device 7. A transverse conveying device 6 is arranged at the tail end of the feeding conveyor line 5 and the head end of the discharging conveyor line 8.

[0038] Specifically, the large end face inspection device 3 and the top and bottom end face inspection device 4 are sequentially arranged on the feeding conveyor line 5, while the small end face inspection device 7 is arranged separately on the unloading conveyor line 8. This splits the inspection of the six surfaces of the square battery 2 onto two conveyor lines, avoiding blind spots caused by the dense equipment on a single conveyor line. It ensures that each surface receives targeted coverage from its dedicated inspection station, solving the technical problem of easy omissions in the multi-face inspection of the square battery 2. The transverse transfer device 6 directly connects the tail end of the feeding conveyor line 5 and the head end of the unloading conveyor line 8. With the diversion function of the four-to-one diversion device 10, the battery can be quickly transferred between the two conveyor lines, avoiding process interruption. At the same time, splitting the inspection tasks onto the two conveyor lines reduces equipment congestion on a single line and improves the overall online inspection processing efficiency.

[0039] Further configuration: a feeding barcode scanner 1 is installed at the beginning of the feeding conveyor line 5; a discharging barcode scanner 9 is installed at the end of the discharging conveyor line 8.

[0040] Specifically, the unique QR code of the battery is read by the feeding barcode scanner 1, and an independent identification ID is established for each battery. One item, one code for precise management. In the complete detection chain from feeding to unloading, the QR code serves as an information carrier, binding the detection data of each battery with its unique identity.

[0041] Further configuration: the end of the feeding conveyor line 5 is fixedly connected to the four-to-one lane divider 10, and the transverse conveying device 6 is located above the four-to-one lane divider 10 and above the beginning of the unloading conveyor line 8.

[0042] Specifically, the four-to-one splitter 10 can orderly integrate square batteries 2 from multiple parallel feeding branches into a single main line, resolving the flow conflict problem when multiple branches feed simultaneously. This allows the batteries to enter the subsequent transfer stage at a uniform pace, avoiding detection stagnation or posture disorder caused by feeding congestion. The splitter can dynamically adjust the battery convergence rhythm according to the detection efficiency of the feeding line, the lateral transport speed, and the processing capacity of the unloading line, adapting to the capacity fluctuations of different production batches and ensuring the overall system capacity balance.

[0043] The 4-to-1 lane separation equipment 10 consists of 3 belt conveyors and 1 lateral conveyor. The 3 belt conveyors are responsible for connecting with the incoming / outgoing material conveyors, and the lateral conveyor is responsible for lateral movement. Its operation process is as follows:

[0044] A: When belt conveyor No. 1 and the incoming material conveyor are aligned, the battery cells flow into belt conveyor No. 1.

[0045] B: The transverse conveyor moves laterally, aligning the No. 2 belt conveyor with the incoming material conveyor, allowing the battery cells to flow into the No. 2 belt conveyor.

[0046] C: The transverse conveyor moves laterally, aligning the No. 3 belt conveyor with the incoming material conveyor. The battery cells flow into the No. 3 belt conveyor, while the No. 1 and No. 2 conveyors align with the outgoing material conveyor, and the two battery cells they carry flow out through the outgoing material conveyor.

[0047] D: The transverse conveyor moves in the opposite direction to align the No. 2 belt conveyor with the incoming material conveyor, and the battery cells flow into the No. 2 belt conveyor.

[0048] E: The transverse conveyor moves in the opposite direction, aligning belt conveyor 1 with the incoming material conveyor. The battery cells flow into belt conveyor 1, while conveyors 2 and 3 align with the outgoing material conveyor, carrying two battery cells that flow out through the outgoing material conveyor. Repeat step AE to achieve the one-to-four operation.

[0049] Reference Figures 6-11 The large end face inspection device 3, the top and bottom face inspection device 4, and the small end face inspection device 7 are all composed of a dome light-emitting device 302, a line scan camera 301, and a support 303. Two dome light-emitting devices 302 and line scan cameras 301 are arranged opposite each other on the support 303 of the large end face inspection device 3, and the parallel plane of the dome light-emitting device 302 is perpendicular to the ground. Two dome light-emitting devices 302 and line scan cameras 301 are arranged opposite each other on the support 303 of the top and bottom face inspection device 4, and the parallel plane of the dome light-emitting device 302 is parallel to the ground. Two dome light-emitting devices 302 and line scan cameras 301 are arranged opposite each other on the support 303 of the small end face inspection device 7, and the parallel plane of the dome light-emitting device 302 is perpendicular to the ground.

[0050] Specifically, the illumination range of the dome-shaped light-emitting device 302 completely covers the large end face. It consists of multiple sets of LED beads. The line scan camera 301 is connected to the conveyor line by an encoder line. The encoder collects the actual running speed of the conveyor line and outputs the speed to the line scan camera 301. The line scan camera 301 adjusts its sampling frequency in real time according to the running speed, thereby realizing image acquisition of the large end face. After image processing and defect identification, defect detection is completed. The field of view of the line scan camera 301 and the size of the dome light source of the top and bottom surface inspection equipment 4 are smaller than those of the large end face inspection equipment 3. The field of view of the line scan camera 301 and the size of the dome light source of the small end face inspection equipment 7 are smaller than those of the large end face inspection equipment 3. In addition, the encoder of the small end face inspection equipment 7 collects the speed of the transverse transport equipment 6.

[0051] Further configuration: The feeding conveyor line 5 includes an inlet keel chain conveyor 101 and an outlet keel chain conveyor 102, and two clamping conveyors 103 are provided between the inlet keel chain conveyor 101 and the outlet keel chain conveyor 102.

[0052] Specifically, the width of the keel chain conveyor is narrower than the width of the battery cell to be inspected. The purpose is to expose the arc surface where the large end face and the bottom of the battery cell meet within the camera's inspection field of view, so as to complete the inspection of at least 1 / 2 of the arc surface where the large end face and the top or bottom face meet.

[0053] Reference Figure 12 The transverse transport device 6 includes a gantry frame 601, a horizontal moving shaft 603, and a vertical moving shaft 602. The vertical moving shaft 602 is mounted on the horizontal moving shaft 603. A cable chain 604 is mounted on the horizontal moving shaft 603, and a maintenance pin 605 is provided at the end of the horizontal moving shaft 603. The vertical moving shaft 602 is provided with a maintenance pin insertion hole 606 and a battery cell gripper 607.

[0054] Specifically, the horizontal moving axis 603 can also be equipped with a zero-position calibration device and an anti-power failure pneumatic buffer device. The anti-power failure pneumatic buffer device can activate the pneumatic rail lock when the system suddenly loses power. The pneumatic rail lock locks the rail and works with the end buffer to achieve the function of power failure buffering. The maintenance pin 605 is used to lock the linear module when the motor is replaced and repaired. The battery cell gripper 607 grips the large surface of the battery cell, gripping 4 battery cells at a time. The battery cells are then moved laterally through the small end face detection device 7, which can detect 4 battery cells at a time.

[0055] This invention discloses a method for visual inspection of square batteries, comprising: scanning the QR code of a square battery 2 using an infeed scanning device 1 to obtain QR code information; obtaining surface state information of the square battery 2, wherein the surface state information of the square battery 2 includes surface state information of two large end faces, surface state information of the top and bottom faces, and surface state information of two small end faces; binding the QR code information and the surface state information of the square battery 2; and scanning the QR code of the square battery 2 again using an unloading scanning device 9 to remove square batteries 2 with abnormal surface state information.

[0056] Specifically, the bound QR code information runs through the entire process. Subsequently, the QR code can be used to trace back the battery's testing time, testing equipment, defect details and other key information, providing complete data support for production process optimization and after-sales quality inspection, and meeting the quality traceability requirements of high-end application scenarios such as power batteries.

[0057] The method is further configured as follows: images of the two large end faces of the square battery 2 are acquired by the large end face detection device 3, and the surface state information of the two large end faces is obtained through visual processing. The surface state information includes two-dimensional image information and three-dimensional image information; images of the top and bottom surfaces of the square battery 2 are acquired by the top and bottom surface detection device 4, and the surface state information of the top and bottom surfaces is obtained through visual processing; images of the two small end faces of the square battery 2 are acquired by the small end face detection device 7, and the surface state information of the two small end faces is obtained through visual processing.

[0058] Specifically, scratches and dents are identified based on two-dimensional image information, while cavities, bubbles, and foreign objects are identified based on three-dimensional image information. Two-dimensional image information focuses on planar morphological anomalies, accurately capturing surface defects such as scratches and dents; three-dimensional image information focuses on three-dimensional morphological anomalies, accurately identifying three-dimensional defects such as cavities, bubbles, and foreign objects. The two work together to achieve full-type coverage and solve the problem of missed defects caused by traditional single-dimensional detection.

[0059] Further configuration: After obtaining the surface condition information of the two large end faces, the surface condition of the top face and the bottom face of the feeding conveyor line 5, the square battery 2 is transported to the four-to-one separation equipment 10; the transverse transfer equipment 6 transports the square battery 2 to the unloading conveyor line 8.

[0060] Specifically, the transport direction of the feeding conveyor line 5 is consistent with the guiding design of the four-to-one lane separation equipment 10, which can arrange the batteries into a uniform posture before transferring them to the transverse transport equipment 6. The transverse transport equipment 6 operates from above and uses a gripping or adsorption method to ensure that the batteries do not tilt, flip or shift during the transfer process, so that the posture of the batteries when entering the unloading line is completely matched with the preset posture before detection. This provides a stable benchmark for the lens positioning and image acquisition of the small end face detection equipment 7, and avoids blind spots or misjudgments in the small end face detection caused by posture deviation.

[0061] The working principle and beneficial effects of this invention are as follows:

[0062] Full-surface, no-blind-spot precision inspection. A separate feed and unfeed line layout, coupled with three types of dedicated inspection equipment, covers all six surfaces of the battery. Combined with 2D and 3D image collaborative analysis, it accurately distinguishes between planar defects such as scratches and dents and 3D defects such as shrinkage cavities and bubbles, significantly reducing missed and false detection rates. A four-to-one splitter 10 integrates multiple feed paths, while a lateral transport 6 achieves seamless and precise cross-line transfer. The transfer process maintains battery stability, preventing secondary damage, and adapts to dynamic balance with production line cycle time, improving overall processing efficiency. Full lifecycle traceability and control. Feed and unfeed barcode scanning devices 9 establish a one-item-one-code system, binding full-surface inspection data for precise defect tracing. Secondary barcode scanning verification during unfeeding automatically removes abnormal products, forming a closed-loop quality control system, reducing quality risks and rework costs. The split-line layout and modular design reduce equipment interference and improve system reliability. Reserved expansion space allows for adaptation to different battery specifications and capacity upgrades, while supporting data-driven process optimization and meeting intelligent production needs.

[0063] 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for visual inspection of square batteries, characterized in that, include: The feeding conveyor line (5) and the unloading conveyor line (8) are arranged in sequence with a large end face inspection device (3) and a top and bottom face inspection device (4), and a small end face inspection device (7) is arranged on the unloading conveyor line (8). The feeding conveyor line (5) and the unloading conveyor line (8) are provided with transverse transport equipment (6).

2. The system for visual inspection of square batteries according to claim 1, characterized in that, include: The feeding conveyor line (5) is equipped with a feeding barcode scanning device (1) at the beginning. The tail end of the unloading conveyor line (8) is equipped with an unloading scanning device (9).

3. The system for visual inspection of square batteries according to claim 1, characterized in that, include: The end of the feeding conveyor line (5) is fixedly connected to a four-to-one lane divider (10), and the transverse conveying device (6) is located above the four-to-one lane divider (10) and above the beginning of the unloading conveyor line (8).

4. The system for visual inspection of square batteries according to claim 1, characterized in that, include: The large end face detection device (3), the top and bottom face detection device (4), and the small end face detection device (7) are all composed of a dome light-emitting device (302), a line array camera (301), and a bracket (303); The large end face detection equipment (3) has two dome light-emitting devices (302) and a line array camera (301) arranged opposite each other on the bracket (303). The parallel plane of the dome light-emitting device (302) is perpendicular to the ground. The top and bottom surface detection equipment (4) has two dome light-emitting devices (302) and a line array camera (301) arranged opposite each other on the bracket (303). The parallel plane of the dome light-emitting device (302) is parallel to the ground. The small end face detection device (7) has two dome light-emitting devices (302) and a line array camera (301) arranged opposite each other on the bracket (303). The parallel plane of the dome light-emitting device (302) is perpendicular to the ground.

5. The system for visual inspection of square batteries according to claim 1, characterized in that, include: The feeding conveyor line (5) includes an inlet keel chain conveyor (101) and an outlet keel chain conveyor (102), and two clamping conveyors (103) are provided between the inlet keel chain conveyor (101) and the outlet keel chain conveyor (102).

6. The system for visual inspection of square batteries according to claim 1, characterized in that, include: The transverse transport equipment (6) includes a gantry (601), a horizontal moving shaft (603), and a vertical moving shaft (602), wherein the vertical moving shaft (602) is mounted on the horizontal moving shaft (603); A cable chain (604) is provided on the horizontal moving shaft (603), and a maintenance pin (605) is provided at the end of the horizontal moving shaft (603).

7. The system for visual inspection of square batteries according to claim 6, characterized in that, include: The vertical moving shaft (602) is provided with a maintenance pin socket (606) and a cell clamp (607).

8. A method for visual inspection of square batteries, applied to the apparatus for visual inspection of square batteries as described in any one of claims 1-7, characterized in that, include: The QR code information is obtained by scanning the QR code on the square battery (2) using the feeding scanning device (1); Obtain surface state information of square battery (2), wherein the surface state information of square battery (2) includes surface state information of two large end faces, surface state information of top and bottom faces and surface state information of two small end faces; Bind the QR code information and the surface state information of the square battery (2); The square battery (2) is scanned again by the barcode scanning device (9) to remove the square battery (2) with abnormal surface condition information.

9. The method for visual inspection of a square battery according to claim 8, characterized in that, include: Images of the two large end faces of the square battery (2) are acquired by the large end face detection device (3), and the surface state information of the two large end faces is obtained by visual processing. The surface state information includes two-dimensional image information and three-dimensional image information. Images of the top and bottom surfaces of the square battery (2) are collected by the top and bottom surface detection device (4), and the surface state information of the top and bottom surfaces is obtained through visual processing. Images of the two small ends of the square battery (2) are collected by the small end face detection device (7), and the surface state information of the two small ends is obtained through visual processing.

10. The method for visual inspection of a square battery according to claim 8, characterized in that, include: After obtaining the surface condition information of the two large end faces, the surface condition of the top face and the bottom face on the feeding conveyor line (5), the square battery (2) is transported to the four-to-one splitter (10). The transverse conveying equipment (6) transports the square battery (2) to the unloading conveyor line (8).

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