A battery shell surface defect detection device and detection line

Abstract

The application discloses a battery shell surface defect detection device and detection line, which comprises a detection table and an inner wall detection mechanism, wherein the inner wall detection mechanism is installed on the detection table; the inner wall detection mechanism is arranged on one side of a shell opening of the battery shell; the inner wall detection mechanism comprises a pushing driving element, an inner wall detection rod and a first shooting assembly; a lens of the first shooting assembly is installed on the inner wall detection rod, and the inner wall detection rod is connected with the pushing driving element; under the driving of the pushing driving element, the inner wall detection rod extends into the shell opening of the battery shell, and the first shooting assembly detects defects on the inner wall surface of the battery shell. The battery shell surface defect detection device and detection line provided by the application can realize the automation of the detection of the inner wall surface of the battery shell, reduce the production cost and improve the yield of the shipped products.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery assembly pre-detection, and in particular relates to a battery shell surface defect detection device and a detection line. Background Art

[0002] Lithium-ion batteries are high-capacity rechargeable batteries developed in the 1990s. Due to their high operating voltage, high energy density, high specific power, lightweight, compact size, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness, lithium-ion batteries have attracted widespread attention and rapidly developed, becoming a new generation of power batteries. (Wei Ling, Liu Shuguang. New Energy Vehicle Technology and Applications [M], 2018). Due to production process limitations, surface defects such as scratches or notches on the inner and outer walls, inner and outer bottoms, and shell openings may appear on the battery casing. The shipping yield rate in the lithium-ion battery front-end industry is a key indicator for end-customer selection. Therefore, strengthening defect detection for lithium-ion battery casings to improve product yield is imperative.

[0003] Currently, the main method for inspecting lithium battery casings is manual inspection. In particular, there is currently no automated method for inspecting the inner surface of lithium battery casings for surface defects. Manual inspection results in a high frequency of missed detections and false detections. Furthermore, manual inspection is time-consuming and requires significant labor costs. Therefore, there is an urgent need for an automated inspection device for lithium battery casings, particularly inner surface defects. Summary of the Invention

[0004] In view of all or part of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a battery casing surface defect detection device and detection line, which can automatically detect surface defects on the inner wall of the battery casing, monitor the processing technology in real time, track and trace the source, and take corrective measures in time. The automatic detection has a low chance of missed detection and false detection, thereby improving the yield of shipped products, reducing production costs, and increasing factory profits; and the equipment operates stably and reliably, has a simple structure, and is low in cost.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a battery shell surface defect detection device, comprising a detection platform and an inner wall detection mechanism, the inner wall detection mechanism being mounted on the detection platform; the inner wall detection mechanism being disposed on one side of the shell opening of the battery shell; the inner wall detection mechanism comprising a push-drive member, an inner wall detection rod, and a first shooting assembly, the lens of the first shooting assembly being mounted on the inner wall detection rod, the inner wall detection rod being connected to the push-drive member; driven by the push-drive member, the inner wall detection rod extends into the shell opening of the battery shell, and the first shooting assembly performs defect detection on the inner wall surface of the battery shell. The present invention utilizes a push-drive member to extend the inner wall detection rod from the shell opening into the interior of the battery shell, and utilizes the first shooting assembly to perform defect detection on the inner wall surface of the battery shell. This can achieve automated detection of the inner wall surface of the battery shell, reduce production costs, and improve the yield rate of shipped products.

[0007] The battery shell surface defect detection device also includes a conveying mechanism, which includes a main conveyor belt with a plurality of limit grooves and auxiliary conveyor belts arranged on both sides of the main conveyor belt; the battery shell is located in the limit grooves, and the two ends of the cylindrical battery shell are respectively placed on the two auxiliary conveyor belts; the auxiliary conveyor belt is connected to a first lifting drive component to drive the battery shell to be lifted or lowered without completely breaking away from the limit grooves. Under the action of the first lifting drive component, the auxiliary conveyor belt lifts the cylindrical battery shell in the upper limit groove of the main conveyor belt to the top of the limit groove, and within the limit groove, the cylindrical battery shell is rotated on the auxiliary conveyor belt by the power of the auxiliary conveyor belt, so that the camera lens on the first shooting component does not need to be rotated to achieve all-round detection of surface defects on the inner wall of the battery shell.

[0008] The battery casing surface defect detection device also includes an outer wall detection mechanism, which is positioned above the conveying mechanism. The outer wall detection mechanism includes a second camera assembly mounted on the inspection platform, configured to detect defects on the outer wall surface of the battery casing. The present invention utilizes the outer wall detection mechanism and the rotation of the cylindrical battery casing on the auxiliary conveyor belt to achieve comprehensive and automatic inspection of the outer wall surface of the battery casing, saving labor costs.

[0009] The inner wall inspection rods are provided in at least one group, and the first and second camera assemblies are provided in at least one group. Each inner wall inspection rod is matched with a group of first camera assemblies, and the inner wall inspection rods are all driven by the same push-drive member. Multiple groups of inner wall inspection rods and multiple groups of first / second camera assemblies can simultaneously detect surface defects on the inner and outer walls of multiple battery casings, improving inspection speed and further saving labor costs.

[0010] The conveying mechanism further comprises a pressing module, the pressing module comprises a first mounting frame, a first pressing driving element and a pressing wheel assembly; the first mounting frame is mounted on the detection table, the first pressing driving element is mounted on the first mounting frame, and the pressing wheel assembly is connected with the first pressing driving element; the pressing wheel assembly comprises two groups of pressing wheels arranged on the two sides of the same battery shell for pressing. The pressing wheel assembly presses the battery shell, so that the detection stability is ensured, and further, if the cylindrical battery shell rotates by itself, the pressing wheel assembly can prevent the cylindrical battery shell from jumping during rotation.

[0011] The application further provides a battery shell surface defect detection line comprising the battery shell surface defect detection device in any of the above-mentioned schemes.

[0012] The battery shell surface defect detection line further comprises a feeding mechanism, a bottom surface shell opening detection mechanism, a first NG mechanism, a second NG mechanism and a discharging mechanism; the inner wall detection mechanism is located between the first NG mechanism and the second NG mechanism. The bottom surface shell opening detection mechanism can be used for completing omnibearing detection of the battery shell surface defects, the first NG mechanism is used for removing the unqualified battery shells on the bottom surface and / or the shell opening surface, and the second NG mechanism is used for removing the unqualified battery shells on the inner wall surface, so that the product yield can be improved.

[0013] The feeding mechanism comprises a first liftable rack, a first conveying belt and a suction assembly, the suction assembly is used for sucking the battery shell from the first liftable rack to the first conveying belt; the discharging mechanism comprises a second liftable rack, a second conveying belt and a pushing assembly, the pushing assembly is used for pushing the battery shell from the second conveying belt to the second liftable rack. According to the positions of the suction assembly and the pushing assembly, the first liftable rack and the second liftable rack are lifted, so that the suction of the suction assembly to the battery shell and the pushing of the pushing assembly to the battery shell are facilitated.

[0014] The first liftable rack comprises a chain wheel assembly, a lifting driving element, a traction driving element and at least one material placing frame; the first liftable rack is driven to lift by the chain wheel assembly and the lifting driving element; the traction driving element pulls the material placing frame into the lifting starting position of the first liftable rack. The first liftable rack and the second liftable rack are the same or similar in structure. The chain wheel assembly and the lifting driving element can facilitate the lifting of the battery shell, and the traction driving element can facilitate the feeding of the material placing frame containing the battery shell.

[0015] The bottom shell opening inspection mechanism is located on both sides of the battery casing and includes an outer bottom inspection camera assembly, an inner bottom inspection camera assembly, and a shell opening inspection camera assembly. A swing arm discharge mechanism, comprising several grabbing and opening swing arms, is located between the loading mechanism and the bottom shell opening inspection mechanism. These outer bottom inspection camera assemblies, inner bottom inspection camera assemblies, and shell opening inspection camera assemblies enable automated inspection of defects on the inner and outer bottom surfaces and shell opening, saving labor costs. The grabbing and opening swing arms are used to grab the battery casings from the loading mechanism and arrange them in the bottom shell opening inspection mechanism, achieving automation.

[0016] Compared with existing technologies, the present invention has at least the following advantages: By pushing a driving member to extend an inner wall inspection rod from the shell opening into the interior of the battery casing and utilizing a first camera assembly to perform defect detection on the inner wall surface of the battery casing, the present invention automates the inspection of the inner wall surface of the battery casing, reducing production costs and improving the yield rate of shipped products. The processing process can be monitored in real time, and traceability can be achieved, allowing for timely corrective measures. Furthermore, the equipment operates stably and reliably, has a simple structure, and is low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of a battery casing surface defect detection line in Example 2 of the present invention;

[0019] Figure 2 Schematic diagram of the structure of the battery housing in Example 1 and Example 2 of the present invention;

[0020] Figure 3 Schematic diagram of the structure of the main conveyor belt in Example 1 and Example 2 of the present invention;

[0021] Figure 4 yes Figure 3 Enlarged view of area C in the middle;

[0022] Figure 5 Schematic diagram of the structure of the auxiliary conveyor belt in Example 1 and Example 2 of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the inner wall detection mechanism in Example 1 and Example 2 of the present invention;

[0024] Figure 7Schematic diagram of the structure of the auxiliary conveyor belt and the pressing module in Examples 1 and 2 of the present invention;

[0025] Figure 8 Schematic diagram of the structure of the outer wall detection mechanism in Example 1 and Example 2 of the present invention;

[0026] Figure 9 yes Figure 1 Enlarged view of area A in the middle;

[0027] Figure 10 yes Figure 1 Enlarged view of area B in the middle;

[0028] Figure 11 This is a schematic structural diagram of the first liftable material rack in Example 2 of the present invention;

[0029] Figure 12 Schematic diagram of the partial structure of the feeding mechanism in Example 2 of the present invention;

[0030] Figure 13 2 is a schematic structural diagram of the blanking mechanism in Example 2 of the present invention;

[0031] Figure 1 The middle arrow indicates the running direction of the battery casing on the surface defect detection line.

[0032] Reference numerals: 1-detection platform; 2-inner wall detection mechanism; 211-slide rail; 212-slide platform; 22-inner wall detection rod; 23-first shooting assembly; 231-lens; 24-guide plate; 3-battery housing; 301-outer bottom surface; 302-inner bottom surface; 303-inner side wall; 304-outer side wall; 305-shell opening; 401-limiting groove; 41-main conveyor belt; 42, 42'-auxiliary conveyor belts; 402-first Lifting drive member; 411, 411'-synchronizing wheel; 412-main belt section; 43-pressing module; 431-first mounting frame; 432-first pressing drive member; 433-pressing wheel assembly; 434-pressing connecting block; 433a, 433b-pressing wheel; 5-outer wall detection mechanism; 51-second mounting frame; 52-second shooting assembly; 53-lighting mechanism; 6-feeding mechanism; 61-first lifting rack; 611-first A sprocket assembly; 612-first lifting drive member; 613-first material loading frame; 62-first conveyor belt; 621-first inclined guide plate; 63-adsorption assembly; 631-bar magnet; 64-first traction drive member; 65-second pressing drive member; 66-pressing plate; 7-bottom shell opening detection mechanism; 71-outer bottom surface detection camera assembly; 72-inner bottom surface detection camera assembly; 73-shell opening detection camera assembly; 81-first NG mechanism; 82-second NG mechanism; 811-first discharge cylinder; 812-first NG receiving port; 821-second discharge cylinder; 822-second NG receiving port; 9-unloading mechanism; 91-second liftable material rack; 92-second conveyor belt; 93-pushing assembly; 911-second material loading frame; 921-second inclined guide plate; 10-swing arm unloading mechanism; 101-swing arm; a, b, c, d-driving mechanism. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solutions in the specific embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] Example 1

[0035] This embodiment provides a battery shell surface defect detection device, referring to Figure 1 The local structure includes a detection platform 1, a conveying mechanism and an inner wall detection mechanism 2, the conveying mechanism and the inner wall detection mechanism 2 are installed on the detection platform 1; the conveying mechanism is used to convey the battery shell 3, and the inner wall detection mechanism 2 is provided on one side of the shell opening 305 of the battery shell 3, with reference to Figure 2In this embodiment, the battery housing 3 may be a cylindrical lithium battery housing, specifically a 18650 lithium battery housing, but is certainly not limited to a lithium battery housing. Figure 2 The cylindrical battery shell 3 in this embodiment is sealed on one side and open on the other side. The edge of the open side is the shell opening 305, which specifically includes an outer bottom surface 301, an inner bottom surface 302, an inner side wall 303 and an outer side wall 304. Of course, it can also be applied to battery shells with openings on both sides.

[0036] Reference Figure 1 Combined with Figures 3 to 5 The conveying mechanism includes a main conveyor belt 41 provided with a plurality of limiting grooves 401, and auxiliary conveyor belts 42 and 42' provided on both sides of the main conveyor belt 41. The limiting grooves 401 are used to place the battery shell 3. The bottom end of the battery shell 3 corresponds to the auxiliary conveyor belt 42 on one side, and the shell opening 305 end of the battery shell corresponds to the auxiliary conveyor belt 42' on the other side. The two ends of the cylindrical battery shell 3 are respectively placed on the two auxiliary conveyor belts 42 and 42'. The main conveyor belt 41 is driven and conveyed by the driving mechanism a, and the auxiliary conveyor belts 42 and 42' are driven and conveyed together by the driving mechanism b. In this embodiment, the driving mechanism a adopts a servo motor, and the driving mechanism b includes but is not limited to a motor. The auxiliary conveyor belts 42 and 42' are connected to a first lifting drive component 402, such as a lifting cylinder, which lifts or lowers the cylindrical battery shell 3 without completely breaking away from the restriction of the limiting groove 401. When the battery housing 3 is raised, it is located above the limiting groove 401 of the main conveyor belt 41. When the battery housing 3 is lowered, it is located within the limiting groove 401 and is in contact with the bottom of the limiting groove 401. The shape of the limiting groove 401 matches the shape of the battery housing 3, for example, it is an annular groove. When the auxiliary conveyor belts 42, 42' lift the battery housing 3, the auxiliary conveyor belts 42, 42' drive the cylindrical battery housing 3 to rotate without completely breaking away from the restriction of the limiting groove 401, that is, the inspection is completed in a relatively fixed position.

[0037] Reference Figure 3 and Figure 4The main conveyor belt 41 is a detection belt line, which is composed of synchronous pulleys 411 and 411' at both ends and a main belt section 412. There are several limit grooves 401 on the main conveyor belt 41, and each limit groove 401 can be used to place the battery shell 3 to be inspected for inner wall surface defects. In this embodiment, a limit groove 401 is provided every 40 mm on the belt section 412. The battery shell 3 is placed in the limit groove 401, which can protect the battery shell 3 and prevent it from being damaged or falling during the transmission process. Setting the interval of the limit groove 401 to 40 mm can facilitate the installation of cameras such as inner wall inspection cameras on the inspection station. According to the installation space of conventional inspection cameras, it is recommended that the interval of the limit groove 401 be at least 40 mm so that the camera light source can accurately enter the battery shell 3. It can also facilitate other things, such as multiple cylinders arranged in an integrated manner to push multiple battery shells 3 at the same time. Of course, the spacing can also be greater than 40 mm. The larger the spacing value, the more space the detection mechanism occupies, resulting in increased costs.

[0038] Reference Figure 1 、 Figure 2 Combined with Figure 6 The inner wall detection mechanism 2 includes a push drive member, an inner wall detection rod 22 and a first shooting component 23. The first shooting component 23 includes a first camera and a first light source. The push drive member includes a sliding member and a detection rod servo motor. The sliding member includes a slide rail 211 and a slide 212 in this embodiment. In this embodiment, there are multiple sliding members. The slide rail 211 is installed on the detection platform 1, and the slide 212 is installed on the slide rail 211. Under the drive of the detection rod servo motor, the slide 212 moves along the slide rail 211. The first shooting component 23 is installed on the slide 212, and the inner wall detection rod 22 is installed on the first shooting component 23, wherein the lens 231 of the first shooting component 23 is installed at the top of the inner wall detection rod 22. A guide plate 24 is installed on the slide 212, and a guide hole is opened on the guide plate 24. The guide hole is for the inner wall detection rod 22 to pass through, and plays a supporting and guiding role for the inner wall detection rod 22. Driven by the push-drive member, the inner wall detection rods 22 extend into the shell opening 305 of the battery housing 3, and the first camera assembly 23 performs defect detection on the inner wall surface of the battery housing 3. In this embodiment, there are six groups of inner wall detection rods 22 and six groups of first camera assemblies 23. Each group of inner wall detection rods 22 is matched with a group of first camera assemblies 23. The six groups of inner wall detection rods 22 are driven by the same push-drive member. In other embodiments, the number of inner wall detection rods 22 and first camera assemblies 23 can be greater or lesser. By providing multiple groups of inner wall detection rods 22 and multiple groups of first camera assemblies 23, defect detection can be performed on the inner walls of multiple battery housings 3 simultaneously, thereby improving detection speed.

[0039] When the inner wall detection rod 22 extends into the battery shell 3 for detection, if the lens 231 of the first shooting assembly 23 is located at a fixed position in the battery shell 3 for detection, it may not be able to scan all areas of the inner wall of the battery shell 3, so the extension range of the inner wall detection rod 22 can be controlled by the detection rod servo motor to scan at multiple positions to achieve comprehensive detection of the inner wall, for example, through three different positions for distance progressive detection. Figure 5 The battery shell 3 rotates under the driving of the auxiliary conveying belt 42, 42', so the camera lens of the first shooting assembly 23 does not need to rotate to detect the entire circumferential area of the inner wall of the battery shell 3.

[0040] Figure 1 In combination with Figure 7 The conveying mechanism further comprises a pressing module 43, which comprises a first mounting frame 431, a first pressing driving member 432, and a pressing wheel assembly 433. The first pressing driving member 432 can be, for example, a pressing cylinder. The first mounting frame 431 is mounted on the detection table 1, the first pressing driving member 432 is mounted on the first mounting frame 431, and the pressing wheel assembly 433 is connected to the first pressing driving member 432 through a pressing connecting block 434. The pressing wheel assembly 433 comprises two groups of pressing wheels 433a, 433b, which are arranged on the two sides of the same battery shell 3, i.e., the cylindrical outer wall, to prevent the battery shell 3 from jumping during rotation to ensure stable detection. When pressing, it is necessary to prevent jumping error, but also cannot hinder the rotation of the battery shell 3, so that the lens 231 of the first shooting assembly 23 which is fixed can be used for comprehensive automatic detection of the surface defects of the inner wall of the battery shell 3.

[0041] In this embodiment, referring to Figure 1 The battery shell surface defect detection device further comprises an outer wall detection mechanism 5 arranged above the conveying mechanism; referring to Figure 8 The outer wall detection mechanism 5 comprises a second mounting frame 51, a second shooting assembly 52, and a lighting mechanism 53. The second shooting assembly 52 comprises a second camera and a second light source. The lighting mechanism 53 is installed below the second shooting assembly 52 for manual adjustment of the light source to achieve lighting effect. In the battery shell surface defect detection device provided by the present application, the light source does not need to be adjusted frequently after adjustment, and the use of an automatically adjustable light source assembly to adjust the light source will increase the cost, so manual adjustment is preferred. The second mounting frame 51 is mounted on the detection table 1, and the second shooting assembly 52 is mounted on the second mounting frame 51 and located above the main conveying belt 41 for defect detection of the outer wall surface of the cylindrical battery shell 3. In combination with Figure 6 and Figure 8 ​In the embodiment, the first photographing assembly 23 and the second photographing assembly 52 are both line scanning cameras. The second photographing assembly 52 has six groups, and in other embodiments, there can be more or less, corresponding to the number and position of the first photographing assembly 23 in the embodiment. When the battery shell 3 rotates, the surface defect detection of the inner wall and the outer wall of the battery shell 3 can be completed at the same time, that is, the battery shell 3 in each limiting groove 401 is detected by the first photographing assembly 23 for the inner wall and by the second photographing assembly 52 for the outer wall, that is, the first photographing assembly 23 can be used for inner wall surface detection at the same time, and the second photographing assembly 52 can be used for outer wall surface detection, to realize automatic detection of the inner side wall 303 and the outer side wall 304 of the battery shell 3. The battery shell surface defect detection device provided in the embodiment can complete the detection of the inner side wall 303 and the outer side wall 304 of the battery shell 3 at the same time. In other embodiments, the outer wall detection of the battery shell 3 can also be performed separately or in other ways.

[0042] Embodiment 2

[0043] The embodiment provides a battery shell surface defect detection line, which comprises the battery shell surface defect detection device in embodiment 1.

[0044] With reference to Figure 1 , the battery shell surface defect detection line further comprises a feeding mechanism 6, a bottom surface shell opening detection mechanism 7, a first NG mechanism 81, a second NG mechanism 82 and a discharging mechanism 9 arranged in sequence; the inner wall detection mechanism 2 is located between the first NG mechanism 81 and the second NG mechanism 82. Figure 9 and Figure 10 The first NG mechanism 81 comprises a first discharge cylinder 811 and a first NG receiving port 812, and the second NG mechanism 82 comprises a second discharge cylinder 821 and a second NG receiving port 822. The first NG mechanism 81 is used for rejecting the battery shell 3 that fails to pass the detection of the bottom surface shell opening detection mechanism 7, and the second NG mechanism 82 is used for rejecting the battery shell 3 that fails to pass the detection of the inner wall detection mechanism 2 and / or the outer wall detection mechanism 5. In other embodiments, the detection of the inner wall detection mechanism 2 and the outer wall detection mechanism 5 can be performed first, then the detection of the first NG mechanism 81, and then the detection of the second NG mechanism 82 after the detection of the bottom surface shell opening detection mechanism 7. The present application does not limit the arrangement and the order of the detection.

[0045] With reference to Figure 1 and in combination with Figure 11 , Figure 12The loading mechanism 6 includes a first liftable material rack 61, a first conveyor belt 62, and an adsorption assembly 63. The first conveyor belt 62 includes two first inclined guide plates 621, which are located on both sides of the rear section of the first conveyor belt 62. The adsorption assembly 63 adsorbs the battery casings 3 onto the front section of the first conveyor belt 62. The battery casings 3 are arranged horizontally and enter the rear section of the first conveyor belt 62 from the first inclined guide plates 621. The first conveyor belt 62 is driven and conveyed by a drive mechanism c, which can be a motor. The adsorption assembly 63 can adsorb one row of battery casings 3 at a time, which is 20 battery casings 3 in this embodiment. In this embodiment, the adsorption assembly 63 includes a bar magnet 631 and a drive mechanism d, which can be a cylinder. The use of magnetic adsorption takes up less space and does not need to consider the accuracy of the arrangement position. In other embodiments, adsorption can also be performed using a nozzle / suction cup adsorption method.

[0046] The loading mechanism 6 also includes a second pressing drive member 65 and a pressing plate 66. The second pressing drive member 65 and the pressing plate 66 are installed on the side opposite to the adsorption component 63 along the front section of the first conveyor belt 62 and close to the first liftable material rack 61. The pressing plate 66 is installed below the second pressing drive member 65. The second pressing drive member 65 is a lifting cylinder in this embodiment. The second pressing drive member 65 is first used to lift the pressing plate 66. The driving mechanism d extends the bar magnet 631. The bar magnet 631 passes through the gap below the pressing plate 66. The bar magnet 631 is energized to adsorb the battery housing 3 on the first liftable material rack 61. After adsorption, it reaches the top of the front section of the first conveyor belt 62. When the bar magnet 631 is de-energized, the battery housing 3 falls onto the first conveyor belt 62. At this time, the second pressing drive member 65 presses the pressing plate 66 downward, and the pressing plate 66 plays a limiting and guiding role for the battery housing 3 on the first conveyor belt 62, so as to facilitate the horizontal arrangement and transportation of the battery housing 3 on the first conveyor belt 62.

[0047] Reference Figure 11The first liftable material rack 61 includes a first sprocket assembly 611, a first lifting drive 612, a first traction drive 64, and at least one first loading frame 613. The first liftable material rack 61 is driven to rise and fall by the first sprocket assembly 611 and the first lifting drive 612. The first sprocket assembly 611 includes a first chain and a first sprocket. In this embodiment, the first lifting drive 612 is a motor, which drives the first chain to rotate, thereby achieving the lifting and lowering of the first loading frame 613. In this embodiment, there are three first loading frames 613. When all the battery shells 3 in the upper first loading frame 613 are adsorbed onto the first conveyor belt 62 by the adsorption assembly 63, the empty first loading frame 613 is removed and driven by the first lifting drive 612 to lift the second first loading frame 613 containing battery shells 3 so that the adsorption assembly 63 can continue to adsorb and load materials. Other embodiments may include more or fewer first loading frames 613. The first traction drive member 64, such as a pneumatic cylinder, pulls the first loading frame 613 containing the battery casings 3 into the chain lifting starting position of the first liftable rack 61. The motor then drives the chain to rise to the position where the bar magnet 631 attracts the battery casings 3 in the first loading frame 613. In other embodiments, the first traction drive member 64 may also use other drive devices to pull the first loading frame 613.

[0048] Reference Figure 13 The unloading mechanism 9 includes a second liftable material rack 91, a second conveyor belt 92 and a pushing assembly 93. The second liftable material rack 91 includes a second sprocket assembly, a second lifting drive, a second traction drive and at least one second loading frame 911. The configuration of the second liftable material rack 91 is basically the same as that of the first liftable material rack 61 and will not be repeated. After the first row of battery shells 3 of the second loading frame 911 is full, the second liftable material rack 91 is lowered to the height of one row of battery shells 3 under the action of the second sprocket assembly and the second lifting drive to continue unloading. In this embodiment, three second loading frames 911 are installed on the second liftable material rack 91. When the lower second loading frame 911 is full of battery shells 3, the second traction drive, such as a cylinder, pushes the second loading frame 911 containing the battery shells 3 out of the chain lifting starting position of the second liftable material rack 91 to complete unloading.

[0049] The second conveying belt 92 comprises two second inclined guide plates 921 located on both sides of the front section belt of the second conveying belt 92, and the qualified battery shell 3 is transferred from the main conveying belt 41 to the second conveying belt 92. The second conveying belt 92 is arranged in an inclined manner, and the battery shell 3 can roll horizontally from the front section belt of the second conveying belt 92 to the rear section belt of the second conveying belt 92 under the action of gravity. In the embodiment, the pushing assembly 93 comprises a pushing cylinder and a pushing plate, and the pushing plate pushes the battery shell 3 from the rear section belt of the second conveying belt 92 to the second material placing frame 911 on the second lifting frame 91 under the action of the pushing cylinder.

[0050] With reference to Figure 1 and in combination with Figure 9 The bottom surface and shell opening detection mechanism 7 is arranged on both sides of the main conveying belt 41 and comprises an outer bottom surface detection camera assembly 71, an inner bottom surface detection camera assembly 72 and a shell opening detection camera assembly 73. The outer bottom surface detection camera assembly 71 comprises an outer bottom surface detection camera and a light source, the inner bottom surface detection camera assembly 72 comprises an inner bottom surface detection camera and a light source, and the shell opening detection camera assembly 73 comprises a shell opening detection camera and a light source. The outer bottom surface 301, the inner bottom surface 302 and the shell opening 305 of the battery shell 3 are sequentially subjected to surface defect detection. In other embodiments, other detection mechanisms and sequences can also be used, and the present application is not limited in this regard.

[0051] With reference to Figure 1 and in combination with Figure 9 The swing arm material placing mechanism 10 is arranged between the feeding mechanism 6 and the bottom surface and shell opening detection mechanism 7, and the swing arm material placing mechanism 10 comprises a plurality of open-close swing arms 101 for grabbing the battery shells 3 arranged on the rear section belt of the first conveying belt 62 and placing the battery shells 3 on the main conveying belt 41. Subsequently, the bottom surface and shell opening detection and the inner and outer wall detection of the battery shell 3 are performed. In the embodiment, the swing arm 101 is six groups, and six battery shells 3 are grabbed at the same time. The number of battery shells 3 grabbed at the same time can be monitored by a sensor, and in other embodiments, the swing arm 101 can be more or less, or other mechanical hands can be used to grab the battery shells 3.

[0052] The working process of the battery shell surface defect detection line provided by the present application is described by taking the embodiment 2 as an example, and the present application is not limited in terms of the sequence of each detection.

[0053] The first material placing frame 613 arranged with the whole battery shell 3 is pulled to the chain lifting starting position by the first traction driving element 64, the first lifting driving element 612 drives the chain to lift to the position of being adsorbed by the bar magnet 631, one row of battery shells 3 such as 20 battery shells 3 are adsorbed by the bar magnet 631, the driving mechanism d drives the bar magnet 631 to shift to the upper side of the first conveying belt 62, the magnet is powered off, the battery shell 3 is shifted to the front section of the first conveying belt 62. The bar magnet 631 continues to adsorb the second row of battery shells 3 (adsorbed from top to bottom or from bottom to top), and the height of the first material placing frame 613 is lifted by the chain lifting. The battery shell 3 moves with the first conveying belt 62 and reaches the lower side of the swing arm 101, and the swing arm 101 is grabbed to adjust the opening and closing to separate and feed, that is, six horizontally arranged battery shells 3 are placed in the limiting groove 401 of the main conveying belt 41 (detection belt line) in sequence (at the same time) to be conveyed, and the swing arm 101 performs the next round of separation and feeding.

[0054] The battery shell 3 is conveyed on the main conveying belt 41, reaches the outer bottom surface detection camera assembly 71, and is dynamically checked by the camera to take pictures. Continue to convey, reach the inner bottom surface detection camera assembly 72, and can be dynamically checked by the camera to take pictures. Continue to convey, reach the shell opening detection camera assembly 73, and dynamically check the shell opening 305 by the camera to take pictures. The photo information of the outer bottom surface 301, the inner bottom surface 302 and the shell opening 305 of the battery shell 3 is obtained in sequence, and the defect is judged. If the defect judgment result is unqualified, the unqualified battery shell is removed by the first NG mechanism 81, and the qualified product continues to be detected.

[0055] The battery shell 3 continues to be conveyed on the main conveying belt 41, reaches the inner wall detection mechanism 2 and the outer wall detection mechanism 5, and the auxiliary conveying belt 42, 42' is lifted by the first lifting driving element 402. The cylindrical battery shell 3 is lifted and not completely separated from the limiting groove 401. The battery shell 3 is separated from the main conveying belt 41 and rotates, and at the same time, the outer wall of the cylindrical battery shell 3 is pressed by the pressing wheel 433a, 433b to prevent jumping error. The conveying of the main conveying belt 41 is closed, six groups of second shooting assemblies 52 above the main conveying belt 41 take pictures of the outer wall of the six battery shells 3 arranged in the partition at the same time to detect defects, six groups of inner wall detection rods 22 are inserted into the six battery shells 3 arranged in the partition at the same time to detect defects, and six groups of first shooting assemblies 23 are used to detect the inner wall of the battery shell 3. After detection, the inner wall detection rod 22 is retracted, the main conveying belt 41 moves a certain distance, and other battery shells 3 are continuously detected. After the battery shell 3 is detected, the defect is judged, and the battery shell 3 with unqualified inner wall and outer wall surface defect is removed by the second NG mechanism 82, and the qualified product continues to be conveyed under the driving of the main conveying belt 41.

[0056] When the battery shell 3 is conveyed to the unloading mechanism 9, it is conveyed from the main conveying belt 41 to the front section of the second conveying belt 92, and under the action of gravity, the battery shell 3 rolls to the back section of the second conveying belt 92, and is pushed by the pushing assembly 93 to the second material placing frame 911 of the second liftable rack 91, the pushing assembly 93 continues to push the battery shell 3 to stack and discharge the second row of battery shells 3 (stacked from bottom to top), specifically by adjusting the height of the second material placing frame 911 through the chain lifting, and finally conveyed to the lower through the second traction driving piece to push out the material, and the process ends.

[0057] The above description of the embodiments is only used to help understand the method and core idea of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery shell surface defect detection device, characterized in that: The invention comprises a detection platform (1) and an inner wall detection mechanism (2), wherein the inner wall detection mechanism (2) is mounted on the detection platform (1); the inner wall detection mechanism (2) is arranged on one side of the shell opening (305) of the battery shell (3); the inner wall detection mechanism (2) comprises a push driving member, an inner wall detection rod (22) and a first shooting assembly (23), wherein the lens (231) of the first shooting assembly (23) is mounted on the inner wall detection rod (22), and the inner wall detection rod (22) is connected to the push driving member; under the drive of the push driving member, the inner wall detection rod (22) extends into the shell opening (305) of the battery shell (3), and the first shooting assembly (23) performs defect detection on the inner wall surface of the battery shell (3); and further comprises a conveying mechanism, wherein the conveying mechanism comprises a main conveyor belt (41) provided with a plurality of limit grooves (401), a conveyor belt (41) provided on the main conveyor belt (41) and a conveyor belt (41) provided on the main conveyor belt (41) ) on both sides; the battery housing (3) is located in the limiting groove (401), and the two ends of the cylindrical battery housing are respectively placed on the two auxiliary conveyor belts; the auxiliary conveyor belt is connected to a first lifting drive member (402) to drive the battery housing (3) to be lifted or lowered, and not completely out of the limit of the limiting groove (401); under the action of the first lifting drive member (402), the auxiliary conveyor belt lifts the battery housing (3) in the limiting groove (401) on the main conveyor belt (41) to the top of the limiting groove (401), and within the limit of the limiting groove (401), the battery housing (3) is rotated on the auxiliary conveyor belt by the power of the auxiliary conveyor belt, so that the lens (231) on the first shooting component (23) does not need to be rotated to achieve full-range detection of surface defects on the inner wall of the battery housing (3).

2. A battery casing surface defect detection device according to claim 1, characterized in that: The battery casing surface defect detection device further comprises an outer wall detection mechanism (5), which is arranged above the conveying mechanism; the outer wall detection mechanism (5) comprises a second shooting assembly (52) mounted on the detection platform (1) and is used to perform defect detection on the outer wall surface of the battery casing (3).

3. A battery casing surface defect detection device according to claim 2, characterized in that: The inner wall detection rods (22) are at least one group, the first shooting assembly (23) and the second shooting assembly (52) are at least one group, each inner wall detection rod (22) matches a group of first shooting assemblies (23), and the inner wall detection rods (22) are all driven by the same push drive member.

4. A battery casing surface defect detection device according to any one of claims 1 to 3, characterized in that: The conveying mechanism further comprises a pressing module (43), the pressing module (43) comprising a first mounting frame (431), a first pressing drive member (432) and a pressing wheel assembly (433); the first mounting frame (431) is mounted on the inspection table (1), the first pressing drive member (432) is mounted on the first mounting frame (431), and the pressing wheel assembly (433) is connected to the first pressing drive member (432); the pressing wheel assembly (433) comprises two sets of pressing wheels, which are respectively arranged on both sides of the same battery housing (3) for pressing.

5. A battery shell surface defect detection line, characterized in that: A battery casing surface defect detection device comprising the device described in any one of claims 1 to 4.

6. A battery shell surface defect detection line according to claim 5, characterized in that: The battery shell surface defect detection line further comprises a loading mechanism (6), a bottom shell opening detection mechanism (7), a first NG mechanism (81), a second NG mechanism (82) and a unloading mechanism (9); the inner wall detection mechanism (2) is located between the first NG mechanism (81) and the second NG mechanism (82).

7. A battery shell surface defect detection line according to claim 6, characterized in that: The loading mechanism (6) comprises a first elevating material rack (61), a first conveyor belt (62) and an adsorption assembly (63), wherein the adsorption assembly (63) adsorbs the battery housing (3) from the first elevating material rack (61) to the first conveyor belt (62); the unloading mechanism (9) comprises a second elevating material rack (91), a second conveyor belt (92) and a pushing assembly (93), wherein the pushing assembly (93) pushes the battery housing (3) from the second conveyor belt (92) to the second elevating material rack (91).

8. A battery shell surface defect detection line according to claim 7, characterized in that: The first liftable material rack (61) comprises a sprocket assembly, a lifting drive, a traction drive, and at least one material placement frame; the first liftable material rack (61) is driven to lift by the sprocket assembly and the lifting drive, and the traction drive pulls the material placement frame into a lifting starting position of the first liftable material rack (61).

9. A battery shell surface defect detection line according to claim 6, characterized in that: The bottom shell opening detection mechanism (7) is arranged on both sides of the battery housing (3), and the bottom shell opening detection mechanism (7) includes an outer bottom surface detection camera assembly (71), an inner bottom surface detection camera assembly (72), and a shell opening detection camera assembly (73); a swing arm discharge mechanism (10) is arranged between the feeding mechanism (6) and the bottom shell opening detection mechanism (7), and the swing arm discharge mechanism (10) includes a plurality of grabbing opening and closing swing arms (101).

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