Battery cell appearance detection equipment

Abstract

The invention discloses battery cell appearance detection equipment, and particularly relates to the technical field of battery cell appearance detection.According to the battery cell appearance detection equipment, a contact unit is arranged, two synchronous jacking air cylinders drive a jacking plate to ascend, two friction driving rollers are attached to the outer wall of a battery cell and rotate at the same time, and the battery cell is driven to rotate in a clamping unit; the upper detection unit and the lower detection unit slide in the axial direction of the battery cell through respective linear guide rails, image information of the upper surface and the lower surface of the battery cell is collected through an upper camera and a lower camera, after first-round collection is completed, the battery cell rotates, image collection of the remaining area is completed, and image collection is completed. Therefore, high-precision detection of the appearance of the whole surface of the battery cell is realized. Complete image collection of the upper surface, the lower surface and the side wall of the battery cell is achieved through rotation of the battery cell and linkage sliding of the upper camera and the lower camera, the detection range is free of dead corners, and an efficient closed-loop detection link is formed by recording the position of a bad battery cell and executing removal operation in a rear-section removal unit.

Description

Technical Field

[0001] This invention relates to the field of battery cell appearance inspection technology, specifically to a battery cell appearance inspection device. Background Technology

[0002] As the core component of lithium batteries, the appearance quality of the battery cell directly affects the safety and consistency of the battery. Common appearance defects during the cell manufacturing process include: tab defects (such as warping or breakage), scratches on the casing surface, dents, foreign matter adhesion, poor sealing, and dimensional deviations. If these defects are not detected in time before leaving the factory, they may lead to serious safety hazards such as short circuits, leakage, bulging, or even explosions during cell assembly and use.

[0003] According to the search, the invention patent with publication number CN119406784A discloses a battery cell appearance inspection device. By controlling the flipping drive unit, one of the two sorting racks is driven to flip upward, so that battery cells with dirty surfaces and battery cells with defects or damage on the surface fall into different feeding chutes respectively.

[0004] Existing battery cell appearance inspection methods are insufficient for comprehensive detection of minute defects, reflective areas, or complex contours on the cell surface. They also suffer from numerous blind spots in image acquisition, making it difficult to meet the demand for refined inspection of the entire cell surface. After identifying defective cells, battery cell inspection systems typically rely on manual removal or mechanical flipping, resulting in low removal efficiency or susceptibility to errors during the removal process. Consequently, it is difficult to form a stable and reliable automated inspection closed loop. Summary of the Invention

[0005] The purpose of this invention is to provide a battery cell appearance inspection device to solve the problems mentioned in the background art.

[0006] The main technical problem solved by this invention is: Tiny defects, reflective areas, or complex contours on the surface of battery cells are difficult to detect comprehensively, resulting in many blind spots in image acquisition and making it difficult to meet the needs of fine-grained inspection of the entire surface of battery cells. After identifying defective products, manual removal or mechanical flipping is usually required, which leads to low efficiency or easy errors in the removal process, making it difficult to form a stable and reliable automated detection closed loop.

[0007] This invention can be achieved through the following technical solutions: A battery cell appearance inspection device includes an inspection chamber mounted on a base and a conveying unit located in the middle of the base and extending into the inspection chamber. The conveying unit is equipped with several sets of snap-fit ​​units that support cylindrical battery cells and limit their edges. The bottom of the inner cavity of the testing chamber is equipped with a contact unit for driving the rotation of the cylindrical battery cell. The contact unit includes two synchronous lifting cylinders embedded in the bottom of the inner cavity of the detection chamber. The pushing ends of the two synchronous lifting cylinders are connected to a top support plate. A support bracket is installed on the upper surface of the top support plate. A lower detection unit is slidably installed in the middle of the upper surface of the support bracket. The upper surface of the support bracket and both sides of the lower detection unit are rotatably mounted with friction drive rollers that contact the corresponding battery cells, and the two friction drive rollers rotate in the same direction. An installation plate is fixed inside the detection chamber, and an upper detection unit that works in conjunction with the lower detection unit is slidably provided below the installation plate. Both the upper and lower detection units include linear guide rails. An upper camera is mounted on the slider of the upper linear guide rail, and a lower camera is mounted on the slider of the lower linear guide rail. The upper and lower cameras are initially in the same position and slide in the same direction; One side of the contact unit is equipped with a rejection unit for grabbing and removing unqualified battery cells, and the rear side of the detection chamber is equipped with a receiving chamber that communicates with the rejection unit.

[0008] A further technical improvement of the present invention is that: the conveying unit includes two feeding belts arranged in parallel along the conveying direction and disposed in the middle of the base, and the top support plate is disposed in the gap area between the two feeding belts; When the top support plate rises, it causes the friction drive roller to come into contact with the battery cell.

[0009] A further technical improvement of the present invention is that: an upper detection light source is fixedly provided on the lower surface of the mounting plate, a lower detection light source is provided below the upper detection light source, and the lower detection light source is located between the two feeding belts; The surface of the top support plate and below the lower detection light source are provided with a rectangular cavity, the gap of which is larger than the diameter of the lower detection light source.

[0010] A further technical improvement of the present invention is that the rejection unit includes multiple actuators located at the top of the inner cavity of the detection chamber, and the pushing end of each actuator is connected to an electric gripper for holding the defective battery cell.

[0011] A further technical improvement of the present invention is that: the rear side of the inner cavity of the detection chamber is provided with a plurality of discharge ports communicating with the receiving chamber, and the front side of the inner cavity of the detection chamber is provided with a push plate coaxially arranged with the corresponding discharge port, and each push plate is pushed by a push cylinder arranged on the front side inside the detection chamber.

[0012] A further technical improvement of the present invention is that: after the battery cell passes through the rotation detection of the contact unit, the system automatically records the current position of the defective battery cell. When the battery cell moves with the feeding belt to the preset rejection unit area, the corresponding execution cylinder moves downward to drive the electric gripper located below it to pick up the defective battery cell and move it upward to the height of the discharge port, so that it is removed from the feeding belt. The battery cells that pass the appearance inspection are conveyed to the assembly station along the feeding belt.

[0013] A further technical improvement of the present invention is that: the snap-fit ​​unit includes a support for supporting the lower surface of the edge of the battery cell, an electromagnet is installed on the side surface of the support away from the middle of the base, the electromagnet is installed in the middle of one side of the support, and its output end is connected to a fixing plate, and fixing rods that slide in cooperation with the fixing plate are installed on both sides above the electromagnet. A ring seat is rotatably mounted on the surface of the fixed plate, and the ring seat is installed between two fixed rods.

[0014] A further technical improvement of the present invention is that: the inner cavity of the ring seat is provided with two buffer cavities, upper and lower, and a fixed frame is fixed inside each buffer cavity. A contact roller is slidably installed in the groove of the fixed frame, and a compression spring is installed between the slider of the contact roller and the groove. One end of the buffer cavity is rotatably mounted with a contact pad that contacts the edge of the battery cell. A pressure roller is fixed on the inner side of the contact pad, and the contact pad is arc-shaped. The pressure roller and the contact roller are abutted together.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a contact unit, two synchronous lifting cylinders drive the top support plate to rise, and two friction drive rollers adhere to the outer wall of the cylindrical battery cell and rotate simultaneously, causing the battery cell to rotate within the snap-fit ​​unit. The upper and lower detection units slide along the axial direction of the battery cell via their respective linear guides, and use the upper and lower cameras to collect image information of the upper and lower surfaces of the battery cell, respectively. After completing the first round of acquisition, the battery cell rotates by contact with the corresponding friction drive rollers, exposing the side areas that were not directly observed by the camera to the imaging area, completing the image acquisition of the remaining areas, thereby achieving high-precision inspection of the entire surface appearance of the battery cell. Through the battery cell's rotation and the linkage sliding of the upper and lower cameras, complete image acquisition of the upper and lower surfaces and side walls of the battery cell is achieved, with no blind spots in the detection range. By recording the location of defective battery cells, the rejection operation is performed in the subsequent rejection unit, forming an efficient closed-loop detection link and improving the degree of automation. 2. By setting up a rejection unit, the system identifies a battery cell with an appearance defect and determines it to be unqualified, then records its current position information on the conveying path. As the conveying unit continues to operate, the unqualified battery cell is gradually conveyed to the rejection position corresponding to the preset discharge port. The corresponding execution cylinder is activated, driving the electric gripper to grip the target battery cell downwards and lift it from the clamping unit to the same height as the discharge port. Subsequently, the front pushing cylinder drives the push plate to move to the rear, pushing out the battery cell held by the gripper and into the receiving bin through the discharge port, realizing the automatic classification and rejection of unqualified products. Through the linkage between the detection system and the rejection execution, the entire process of positioning, gripping and pushing out unqualified cylindrical battery cells is automatically controlled, improving rejection accuracy and efficiency. 3. Before testing, the battery cells are placed sequentially at different conveying stations and supported by brackets to ensure their height and position are fixed. Then, the electromagnet is energized and attracted, driving the fixed plate connected to its output end to move towards the battery cell. The ring seat and the fixed plate are designed to rotate to accommodate the rotation detection of cylindrical battery cells. When the electromagnet pushes the fixed plate and the ring seat closer to the battery cell, the arc-shaped contact pad first contacts the edge of the cylindrical battery cell, initially forming an outer peripheral limiting structure. As the contact pad rotates, the pressure roller on its inner side gradually moves inward to contact the contact roller, achieving synchronous clamping of the upper and lower edges of the battery cell. During the clamping process, a stable "upper and lower wrapping" limiting structure is formed for the battery cell. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the detection chamber of the present invention; Figure 3 For the present invention Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a three-dimensional installation structure diagram of the linear guide rail of the present invention; Figure 5 For the present invention Figure 2 A magnified view of a section at point B in the middle; Figure 6 This is a schematic diagram of the installation structure of the support and fixing plate of the present invention; Figure 7 For the present invention Figure 6 A magnified view of a section at point C.

[0018] In the diagram: 1. Detection chamber; 2. Receiving chamber; 3. Discharge belt; 4. Support; 5. Electromagnet; 6. Fixing plate; 7. Ring seat; 8. Mounting plate; 9. Upper detection light source; 10. Synchronous lifting cylinder; 11. Top support plate; 12. Groove cavity; 13. Upper camera; 14. Support support; 15. Friction drive roller; 16. Linear guide rail; 17. Lower camera; 18. Execution cylinder; 19. Electric gripper; 20. Discharge port; 21. Push plate; 22. Buffer chamber; 23. Contact pad; 24. Fixing frame; 25. Contact roller; 26. Pressure roller; 27. Fixing rod. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0020] Please see Figures 1-7 As shown, the present invention provides a battery cell appearance inspection device, including an inspection chamber 1 disposed on a base and a conveying unit disposed in the middle of the base and extending into the interior of the inspection chamber 1. The conveying unit is equipped with several sets of snap-fit ​​units that support cylindrical battery cells and limit their edges. The bottom of the inner cavity of the testing chamber 1 is equipped with a contact unit for driving the rotation of the cylindrical battery cell. The contact unit includes two synchronous lifting cylinders 10 embedded in the bottom of the inner cavity of the detection chamber 1. The pushing ends of the two synchronous lifting cylinders 10 are connected to a top support plate 11. A support support 14 is installed on the upper surface of the top support plate 11. A lower detection unit is slidably installed in the middle of the upper surface of the support support 14. Friction drive rollers 15 that are in contact with the corresponding battery cells are rotatably mounted on the upper surface of the support bracket 14 and on both sides of the lower detection unit. The two friction drive rollers 15 rotate in the same direction. An installation plate 8 is fixed inside the detection chamber 1, and an upper detection unit that works in conjunction with the lower detection unit is slidably provided below the installation plate 8. Both the upper detection unit and the lower detection unit include a linear guide rail 16. An upper camera 13 is mounted on the slider of the upper linear guide rail 16, and a lower camera 17 is mounted on the slider of the lower linear guide rail 16. The upper camera 13 and the lower camera 17 are initially in the same position and slide in the same direction; One side of the contact unit is equipped with a rejection unit for grabbing and removing unqualified battery cells, and the rear side of the inspection chamber 1 is equipped with a receiving chamber 2 that communicates with the rejection unit.

[0021] The battery cell in this application is a cylindrical battery cell. During use, the battery cell is stably supported on the conveying unit by the snap-fit ​​unit, and the battery cell to be tested is sequentially sent into the interior of the testing chamber 1 through the conveying unit; each battery cell is supported by a corresponding snap-fit ​​unit and its position is limited.

[0022] When the battery cell reaches the preset detection position, that is, when the battery cell is above the center of the two friction drive rollers 15, the detection begins. The two synchronous lifting cylinders 10 located at the bottom of the detection chamber 1 synchronously drive the top support plate 11 to rise, causing the two friction drive rollers 15 on the support support 14 to fit against the outer wall of the cylindrical battery cell. The two friction drive rollers 15 rotate simultaneously, causing the battery cell to rotate within the snap-fit ​​unit.

[0023] In this state, the upper detection unit and the lower detection unit slide along the axial direction of the battery cell via their respective linear guide rails 16. With the help of the upper camera 13 and the lower camera 17, they collect image information of the upper and lower surfaces of the battery cell respectively. After completing the first round of acquisition, the battery cell rotates by contact with the corresponding friction drive roller 15, exposing the side areas that were not directly observed by the camera to the imaging area, completing the image acquisition of the remaining areas, thereby achieving high-precision detection of the appearance of the entire surface of the battery cell. When a defective battery cell is detected, the system records the position of the battery cell on the conveying unit. When the battery cell continues to move with the conveying unit to the area of ​​the rejection unit, the rejection unit automatically grabs and removes the defective battery cell. The system's built-in laser rangefinder sensor detects the precise position of the battery cell in the transmission path in real time. The laser rangefinder sensor is installed on the bottom surface of the mounting plate 8 at the top of the inner cavity of the detection chamber 1 (not shown in the figure). Its laser emission direction is vertically downward and acts on the upper surface of the battery cell, directly facing the position of the battery cell to be detected in the transmission path, reducing reflection angle error. The laser rangefinder sensor accurately measures the distance between the battery cell and the sensor by emitting a laser beam and receiving the signal reflected from the surface of the battery cell. This distance data is used to determine whether the current position of the battery cell has reached the set detection position range, thereby ensuring that the position of the battery cell does not shift during the detection process. The system records the current position of each battery cell on the delivery path in real time and controls the subsequent rejection unit to reject the cells based on the position data. By rotating the battery cell and sliding it in conjunction with the upper camera 13 and the lower camera 17, complete image acquisition of the upper and lower surfaces and sidewalls of the battery cell can be achieved, with no blind spots in the detection range. By recording the location of defective battery cells and performing rejection operations in the subsequent rejection unit, an efficient closed-loop detection link is formed, improving the degree of automation.

[0024] See Figure 3As shown, the conveying unit includes two feeding belts 3 arranged in parallel along the conveying direction and located in the middle of the base. The top support plate 11 is located in the gap area between the two feeding belts 3. When the top support plate 11 rises, the friction drive roller 15 comes into contact with the battery cell; During the conveying process of the cylindrical battery cell, the battery cell is stably supported by the clamping unit between the two feeding belts 3. When the battery cell is conveyed to the detection position directly above the detection chamber 1, the top support plate 11 set between the two feeding belts 3 is lifted vertically under the drive of the synchronous lifting cylinder 10, so that the friction drive roller 15 installed on its upper surface contacts the bottom of the battery cell. Two friction drive rollers 15 are driven by corresponding drive motors to rotate in the same direction. Through friction with the bottom of the battery cell, they achieve stable self-rotation drive for the cylindrical battery cell.

[0025] See Figure 3 and Figure 4 As shown, an upper detection light source 9 is fixedly provided on the lower surface of the mounting plate 8, and a lower detection light source is provided below the upper detection light source 9, with the lower detection light source located between the two feeding belts 3; The surface of the top support plate 11 and below the lower detection light source is provided with a rectangular cavity 12, the gap of which is larger than the diameter of the lower detection light source.

[0026] During image acquisition, stable illumination is provided by the upper detection light source 9 and the lower detection light source to ensure image clarity. The system performs intelligent analysis on the image to identify whether there are appearance defects such as scratches, deformation, leakage, and contamination. When the top support plate 11 rises, the lower part of the lower detection light source enters the cavity 12, thus avoiding interference with the movement of the top support plate 11.

[0027] See Figure 5 As shown, the rejection unit includes multiple actuator cylinders 18 located at the top of the inner cavity of the detection chamber 1. The pushing end of each actuator cylinder 18 is connected to an electric gripper 19 for clamping the unqualified battery cell. The rear side of the inner cavity of the detection chamber 1 is provided with multiple discharge ports 20 that communicate with the receiving chamber 2, and the front side of the inner cavity of the detection chamber 1 is provided with push plates 21 that are coaxially arranged with the corresponding discharge ports 20. Each push plate 21 is pushed by a push cylinder located on the front side of the inner cavity of the detection chamber 1. After the system identifies a battery cell with an appearance defect (such as scratches, bulges, contamination, etc.) and determines it to be unqualified, it records its current position information on the transport path. As the conveying unit continues to operate, the defective battery cell is gradually conveyed to the rejection position corresponding to the preset discharge port 20; When the corresponding cylinder 18 is activated, it drives the electric gripper 19 to grip the target battery cell downwards, lifting it from the clamping unit to the same height as the discharge port 20. Subsequently, the front pusher cylinder drives the pusher plate 21 to move backwards, pushing the battery cell held by the electric gripper 19 out and into the receiving bin 2 through the discharge port 20, realizing the automatic classification and rejection of defective products. Through the linkage between the detection system and the rejection execution, the entire process of positioning, gripping and pushing out defective cylindrical battery cells is automatically controlled, improving rejection accuracy and efficiency. Multiple discharge ports 20 form a parallel working channel, supporting the classification, rejection and recording of cylindrical battery cells with different defect types, which facilitates subsequent quality tracking and production adjustment.

[0028] After the battery cell passes through the rotation detection of the contact unit, the system automatically records the current location of the defective battery cell. When the battery cell moves to the preset rejection unit area with the feeding belt 3, the corresponding execution cylinder 18 moves downward, driving the electric gripper 19 located below it to pick up the defective battery cell and move it upward to the height of the discharge port 20, so that it is removed from the feeding belt 3. The battery cells that pass the appearance inspection are conveyed to the assembly station along the feeding belt 3.

[0029] See Figure 6 As shown, the snap-fit ​​unit includes a support 4 that supports the lower surface of the edge of the battery cell. An electromagnet 5 is installed on the side surface of the support 4 away from the middle of the base. The electromagnet 5 is installed in the middle of one side of the support 4, and its output end is connected to a fixing plate 6. Fixing rods 27 that slide and cooperate with the fixing plate 6 are installed on both sides above the electromagnet 5. A ring seat 7 is rotatably mounted on the surface of the fixed plate 6, and the ring seat 7 is installed between two fixed rods 27.

[0030] When the battery cell enters the corresponding conveying station, the bottom edge of the cylindrical battery cell is supported by the support 4 to ensure that its height position is fixed. Then, the electromagnet 5 is energized and attracted, which drives the fixed plate 6 connected to its output end to move towards the battery cell. During the movement of the fixed plate 6, it is limited and constrained by the fixed rods 27 on both sides, so that it slides in the predetermined direction to ensure that the movement trajectory is stable and does not deviate. When the fixed plate 6 moves to the designated position, the ring seat 7 is engaged and attached to the outer edge of the cylindrical battery cell. The ring seat 7 and the fixed plate 6 are designed to rotate to adapt to the rotation detection of the cylindrical battery cell.

[0031] See Figure 7 As shown, the inner cavity of the ring seat 7 is provided with two buffer chambers 22, one above the other. Each buffer chamber 22 is fixed with a fixed frame 24. A contact roller 25 is slidably installed in the groove of the fixed frame 24. A compression spring is installed between the slider of the contact roller 25 and the groove. One end of the buffer cavity 22 is rotatably mounted with a contact pad 23 that contacts the edge of the battery cell. A pressure roller 26 is fixed on the inner side of the contact pad 23, and the contact pad 23 is arc-shaped. The pressure roller 26 and the contact roller 25 are abutted together. When the electromagnet 5 pushes the fixing plate 6 and drives the ring seat 7 to approach the battery cell, the arc-shaped contact pad 23 first contacts the edge of the cylindrical battery cell, initially forming an outer peripheral limiting structure. As the contact pad 23 rotates, the pressure roller 26 on its inner side gradually moves inward, transmitting force to the contact roller 25 directly opposite it. Under the pressure of the external force, the contact roller 25 compresses the compression spring along the slide groove direction of the fixed frame 24, forming an effective buffer and absorption space, realizing synchronous clamping of the upper and lower edges of the battery cell. During the clamping process, a stable limiting structure of "upper and lower wrapping" is formed for the battery cell, ensuring that the posture does not deviate during the inspection and handling process.

[0032] In use, before testing, the battery cells are placed sequentially at different conveying stations and supported by the support 4 to ensure their height and position are fixed. Then, the electromagnet 5 is energized and attracted, driving the fixed plate 6 connected to its output end to move towards the battery cell. The ring seat 7 is designed to rotate with the fixed plate 6 to accommodate the rotation detection of the cylindrical battery cell. When the electromagnet 5 pushes the fixed plate 6 and drives the ring seat 7 to approach the battery cell, the arc-shaped contact pad 23 first contacts the edge of the cylindrical battery cell, initially forming an outer peripheral limiting structure. As the contact pad 23 rotates, the pressure roller 26 on its inner side gradually contacts the contact roller 25, achieving synchronous clamping of the upper and lower edges of the battery cell. During the clamping process, a stable limiting structure of "upper and lower wrapping" is formed for the battery cell. By setting up a contact unit, two synchronous lifting cylinders 10 synchronously drive the top support plate 11 to rise, causing the two friction drive rollers 15 on the support support 14 to fit against the outer wall of the cylindrical battery cell. The two friction drive rollers 15 rotate simultaneously, causing the battery cell to rotate within the snap-fit ​​unit. The upper detection unit and the lower detection unit slide along the axial direction of the battery cell via their respective linear guide rails 16. With the help of the upper camera 13 and the lower camera 17, they collect image information of the upper and lower surfaces of the battery cell, respectively. After completing the first round of acquisition, the battery cell rotates by contacting the corresponding friction drive rollers 15, exposing the side areas that were not directly observed by the camera to the imaging area, completing the image acquisition of the remaining areas, thereby achieving high-precision inspection of the entire surface appearance of the battery cell. Through the battery cell's rotation and the linkage sliding of the upper camera 13 and the lower camera 17, complete image acquisition of the upper and lower surfaces and side walls of the battery cell is achieved, with no blind spots in the detection range. By recording the location of defective battery cells and performing rejection operations in the subsequent rejection unit, an efficient closed-loop detection link is formed, improving the degree of automation. By setting up a rejection unit, the system identifies a battery cell with an appearance defect and determines it to be unqualified, then records its current position information on the conveying path. As the conveying unit continues to operate, the unqualified battery cell is gradually conveyed to the rejection position corresponding to the preset discharge port 20. The corresponding execution cylinder 18 is activated, driving the electric gripper 19 to grip the target battery cell downwards and lift it from the clamping unit to the same height as the discharge port 20. Subsequently, the front pushing cylinder drives the push plate 21 to move backwards, pushing out the battery cell gripped by the electric gripper 19 and into the receiving bin 2 through the discharge port 20, realizing the automatic classification and rejection of unqualified products. Through the linkage between the detection system and the rejection execution, the entire process of positioning, gripping and pushing out unqualified cylindrical battery cells is automatically controlled, improving rejection accuracy and efficiency.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A battery cell appearance inspection device, comprising an inspection chamber (1) disposed on a base and a conveying unit disposed in the middle of the base and extending into the inspection chamber (1); Its features are: The conveying unit is equipped with several sets of clamping units that support cylindrical battery cells and limit their edges. The clamping unit includes a support (4) that supports the lower surface of the battery cell edge. An electromagnet (5) is installed on the side surface of the support (4) away from the middle of the base. The electromagnet (5) is installed in the middle of one side of the support (4) and its output end is connected to a fixing plate (6). A ring seat (7) is rotatably installed on the surface of the fixing plate (6). The inner cavity of the ring seat (7) is provided with two buffer chambers (22). A contact pad (23) that contacts the edge of the battery cell is rotatably installed at one end of the buffer chamber (22). The bottom of the inner cavity of the detection chamber (1) is provided with a contact unit for driving the cylindrical battery cell to rotate. The contact unit includes two synchronous lifting cylinders (10) embedded in the bottom of the inner cavity of the detection chamber (1). The pushing ends of the two synchronous lifting cylinders (10) are connected to a top support plate (11). A support bracket (14) is installed on the upper surface of the top support plate (11). A lower detection unit is slidably installed in the middle of the upper surface of the support bracket (14). The upper surface of the support bracket (14) and both sides of the lower detection unit are rotatably mounted with friction drive rollers (15) that are in contact with the corresponding battery cells. The two friction drive rollers (15) rotate in the same direction. The detection chamber (1) is fixed with an installation plate (8), and an upper detection unit that works in conjunction with the lower detection unit is slidably provided below the installation plate (8). Both the upper detection unit and the lower detection unit include a linear guide rail (16). An upper camera (13) is installed on the slider of the upper linear guide rail (16), and a lower camera (17) is installed on the slider of the lower linear guide rail (16). The upper camera (13) and the lower camera (17) are initially in the same position and slide in the same direction; One side of the contact unit is provided with a rejection unit for grabbing and removing unqualified cells, and the rear side of the detection chamber (1) is provided with a receiving chamber (2) that communicates with the rejection unit. The lower surface of the mounting plate (8) is fixedly provided with an upper detection light source (9), and a lower detection light source is provided below the upper detection light source (9).

2. The battery cell appearance inspection equipment according to claim 1, characterized in that, The conveying unit includes two feeding belts (3) arranged in parallel along the conveying direction and located in the middle of the base. The top support plate (11) is located in the gap area between the two feeding belts (3). When the top support plate (11) rises, it causes the friction drive roller (15) to come into contact with the battery cell.

3. The battery cell appearance inspection equipment according to claim 1, characterized in that, The lower detection light source is located between the two feeding belts (3); The surface of the top support plate (11) and below the lower detection light source is provided with a rectangular cavity (12), the gap of the cavity (12) being larger than the diameter of the lower detection light source.

4. The battery cell appearance inspection equipment according to claim 1, characterized in that, The rejection unit includes multiple actuators (18) located at the top of the inner cavity of the detection chamber (1), and each actuator (18) has an electric gripper (19) connected to its pushing end to hold the defective battery cell.

5. The battery cell appearance inspection equipment according to claim 1, characterized in that, The inner rear side of the detection chamber (1) is provided with multiple discharge ports (20) that communicate with the receiving chamber (2), and the inner front side of the detection chamber (1) is provided with push plates (21) that are coaxially arranged with the corresponding discharge ports (20). Each push plate (21) is pushed by a push cylinder located on the front side inside the detection chamber (1).

6. The battery cell appearance inspection equipment according to claim 1, characterized in that, The electromagnet (5) has a fixing rod (27) on both sides above it that slides with the fixing plate (6). The ring seat (7) is installed between two fixed rods (27).

7. The battery cell appearance inspection equipment according to claim 1, characterized in that, Each of the buffer chambers (22) is fixed with a fixing frame (24), and a contact roller (25) is slidably installed in the groove of the fixing frame (24). A compression spring is installed between the slider of the contact roller (25) and the groove. A pressure roller (26) is fixed on the inner side of the contact pad (23), and the contact pad (23) is arc-shaped. The pressure roller (26) and the contact roller (25) are in contact.

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