A lithium battery injection hole sealing welding system

Abstract

The present invention provides a lithium battery injection hole sealing welding system, including a rotary line body and a plurality of battery seats moving with the rotary line body, wherein at least one battery fixing position is arranged on the battery seat, and a loading mechanism is sequentially arranged along the moving path of the rotary line body to fix the lithium battery to the battery seat; a cleaning mechanism to laser clean the metal on the surface of the lithium battery; a nailing mechanism to fix the sealing nail to the injection hole; a welding mechanism to fix the sealing nail and the injection hole by laser welding; and a unloading mechanism to move the welded lithium battery out of the battery seat. The present invention completes the assembly line processing of the injection hole sealing welding through multiple stations, so that each station only performs one step, reducing the processing time required for a single station, allowing the entire production line to circulate and operate, and improving the equipment utilization rate. When the production line is in production, there will be no waiting in the previous and next processes due to the time consumed by welding, thereby improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery production, and in particular to a lithium battery injection hole sealing welding system. Background Art

[0002] After the secondary injection of lithium batteries is completed, the injection port needs to be sealed, which is generally welded and sealed with steel balls, sealing nails and other structures. The existing method is generally to drip UV glue on the surface of the injection port after sealing with steel balls and then use ultraviolet light to cure to complete the sealing of the battery. Since the battery still has electrolyte leakage after sealing with steel balls, the overflowing electrolyte will corrode the UV glue and finally cause the glue drop to fall off, and the battery will also have safety hazards due to leakage problems.

[0003] As a new sealing welding technology, laser welding has a series of advantages such as beautiful welds and good sealing. Therefore, laser welding of sealed aluminum sheets can be used to achieve permanent sealing of batteries. For example, the invention patent application with publication number CN112620861A discloses a method and device for welding battery filling holes, which can complete the process of installing sealing nails, welding tin materials and sealing full welding. This method can use a set of devices to complete the entire welding process. During work, the subsequent production can only be continued after all processing is completed, which affects the production rhythm of the front and back ends and reduces production efficiency. In addition, the welding effect is not tested, and there may be problems with the backflow of unqualified products. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a liquid injection hole sealing welding system which can improve the utilization rate of equipment.

[0005] The present invention solves the above technical problems through the following technical solutions: A lithium battery filling hole sealing welding system, comprising a rotary line body and a plurality of battery seats following the movement of the rotary line body, wherein at least one battery fixing position is arranged on the battery seat, and battery fixing positions are arranged in sequence along the moving path of the rotary line body.

[0006] The feeding mechanism fixes the lithium battery to the battery holder.

[0007] Cleaning mechanism, laser cleaning of metal surface of lithium battery;

[0008] A nailing mechanism is used to fix the sealing nail to the injection hole;

[0009] Welding mechanism, fixing the sealing pin and the injection hole by laser welding;

[0010] The unloading mechanism moves the welded lithium battery out of the battery holder.

[0011] The present invention completes the assembly line processing of the injection hole sealing welding through multiple workstations, so that each workstation only executes one step, reducing the processing time required for a single workstation, allowing the entire production line to flow and operate, and improving the equipment utilization rate. When the production line is in production, there will be no waiting situation in the previous and subsequent processes due to the time consumed by welding, thereby improving production efficiency.

[0012] Preferably, the rotating line body includes a chain and at least a rotating disk at both ends of the chain, the rotating disk is meshed with the chain for transmission, a circle of slide rails is provided on the outside of the chain, the battery seat is fixedly matched with the chain, and a slider is provided at the bottom of the battery seat that slides with the slide rails.

[0013] Preferably, the battery fixing position includes a base plate, a first clamping plate and a second clamping plate arranged at both ends of the base plate, the base plate is provided with a receiving groove between the first clamping plate and the second clamping plate, the bottom of the lithium battery is inserted into the receiving groove, the first clamping plate is fixedly matched with the side of the lithium battery, a sliding rod is provided on the second clamping plate to slide toward the side of the first clamping plate, a movable block is fixedly connected to the end of the sliding rod, and a tightening spring is sleeved on the sliding rod and is located between the movable block and the second clamping plate, and the tightening spring presses the movable block against the side of the lithium battery.

[0014] Preferably, the lithium battery is a cylindrical battery, the first clamping plate is provided with positioning parts at different heights, the positioning parts include two rotating wheels, and the surfaces of the lithium battery are respectively in contact with the two rotating wheels.

[0015] Preferably, the loading mechanism and the unloading mechanism have the same structure, and each includes a first three-axis motion platform, on the first vertical axis of which is fixed a clamping cylinder, to which is connected at least one clamping claw, and which drives the clamping claw to clamp and release the lithium battery.

[0016] Preferably, the cleaning mechanism includes a laser head and a dust removal unit, the laser head is fixed on the output end of a cleaning cylinder, the cleaning cylinder is arranged in a vertical direction, the cleaning cylinder is slidably arranged on a horizontal slide rail, the dust removal unit includes a negative pressure pipe and a dust removal chamber connected to the negative pressure pipe, the dust removal chamber is provided with a through hole in the vertical direction, and the laser head passes through the through hole to perform laser cutting on the upper surface of the lithium battery.

[0017] Preferably, the nailing mechanism includes a vibration plate, a feeding channel connected to the vibration plate, and a suction nozzle, the feeding channel has at least one outlet, the spacing between adjacent outlets is the same as the spacing between adjacent lithium batteries, the suction nozzle is fixed on a second three-axis motion platform, the second three-axis motion platform includes a second transverse slide rail, a second longitudinal slide rail arranged on the second transverse slide rail for transverse sliding, and a second longitudinal slide plate arranged on the second longitudinal slide rail for longitudinal sliding, at least one second vertical slide rail is arranged on the second longitudinal slide plate in the vertical direction, a second vertical slider is slidably arranged on each of the second vertical slide rails, the suction nozzles are respectively fixed to the lower ends of the second vertical sliders, the spacing between adjacent suction nozzles is the same as the spacing between adjacent lithium batteries, the second vertical slider is fixedly connected to the output end of the second vertical cylinder, and the suction nozzle can reciprocate between the outlet of the feeding channel and the injection hole of the lithium battery along the second transverse slide rail.

[0018] Preferably, the welding mechanism includes a clamping unit matched with the lithium battery injection hole, a third three-axis motion platform fixed on the working platform, and a welding gun installed on the third three-axis motion platform; the clamping unit includes a pressing block fixed on a rotating cylinder, an arc-shaped pressing strip is fixedly provided on the pressing block, the pressing block can be rotated to press the pressing strip on the sealing pin of the injection hole, and the welding gun can spot weld or fully weld the sealing pin under the drive of the third three-axis motion platform;

[0019] The third three-axis motion platform is also provided with a first visual detection unit, which includes a first camera and a first light source coaxially arranged with the first camera and below the first camera, and the first light source is located above the lithium battery.

[0020] Preferably, a code scanning mechanism is further provided downstream of the feeding mechanism, a QR code is printed on the upper end surface of the lithium battery, and the code scanning mechanism has a code scanner arranged above the lithium battery.

[0021] Preferably, it also includes a correction mechanism located after the feeding mechanism, the correction mechanism includes a second visual detection unit and a correction wheel, the second visual detection unit includes a second annular light source located above the lithium battery and at least one second camera located above the second annular light source, the correction wheel is matched with a driving wheel through a belt, the driving wheel is fixed to the output end of the driving motor, the driving motor is fixed on a moving platform, and the moving platform can move to make the correction wheel contact with the lithium battery;

[0022] The moving platform is slidably arranged on a base, a moving cylinder fixedly arranged on the base and fixedly matched with the moving platform, a compression cylinder is also fixedly arranged under the base, a pressure plate is fixedly connected to the telescopic end of the compression cylinder, a through groove for accommodating the pressure plate is provided on the movable block, and the movable block follows the movement of the rotating line body to make the pressure plate enter the channel.

[0023] Preferably, a third visual detection unit is further provided between the nailing mechanism and the welding mechanism, and the third visual detection unit includes a third annular light source fixedly provided above the rotating linear body path and at least one third camera located above the third annular light source.

[0024] Preferably, a fourth visual detection unit is also arranged between the welding mechanism and the unloading mechanism, and the fourth visual detection unit includes a fourth annular light source fixedly arranged above the rotating linear body path and a 2D visual camera and / or a 3D visual camera located above the fourth annular light source.

[0025] The lithium battery filling hole sealing welding system provided by the present invention has the advantages of completing the assembly line processing of the filling hole sealing welding through multiple workstations, so that each workstation only executes one step, reducing the processing time required for a single workstation, allowing the entire production line to flow and operate, and improving the equipment utilization rate. When the production line is in production, there will be no waiting situation in the previous and subsequent processes due to the time consumed by welding, thereby improving production efficiency. The revolving line body pulls and guides the battery holder through the cooperation of chains and slide rails. A movable block that provides clamping force through a tightening spring is set on the battery holder to facilitate the fixation of the lithium battery. The loading mechanism and the unloading mechanism drive the clamping claws to move in the space through a three-axis motion platform, which is convenient for clamping and moving the lithium battery. The oxide layer on the surface of the lithium battery is cleared by laser cutting and dust removal, and the debris is sucked away with the help of negative pressure adsorption. The sealing nail is loaded through a vibration plate, and the material is taken through a suction nozzle and placed on the injection hole, which is easy to use. During welding, the sealing nail is first pressed down by a pressure strip, and then the sealing nail is spot welded to fix it. After that, the pressure strip is removed and the sealing nail is fully welded to prevent the sealing nail from sliding and improve the welding quality. A correction mechanism is provided to correct the cylindrical battery to ensure that the injection hole is in the preset position. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a lithium battery liquid injection hole sealing welding system provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a battery holder of a lithium battery liquid filling hole sealing welding system provided by an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of a battery fixing position of a lithium battery liquid filling hole sealing welding system provided by an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a loading mechanism and a unloading mechanism of a lithium battery liquid filling hole sealing welding system provided in an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a cleaning mechanism of a lithium battery liquid injection hole sealing welding system provided by an embodiment of the present invention;

[0031] Figure 6 One of the schematic diagrams of the nailing mechanism of the lithium battery filling hole sealing welding system provided in an embodiment of the present invention;

[0032] Figure 7 A second schematic diagram of a nailing mechanism of a lithium battery liquid filling hole sealing welding system provided in an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of a welding mechanism of a lithium battery liquid injection hole sealing welding system provided in an embodiment of the present invention;

[0034] Fig. 9 A schematic diagram of a code scanning mechanism of a lithium battery liquid filling hole sealing welding system provided by an embodiment of the present invention;

[0035] Fig.10 One of the schematic diagrams of the deviation correction mechanism of the lithium battery filling hole sealing welding system provided by the embodiment of the present invention;

[0036] Fig.11 The second schematic diagram of the deviation correction mechanism of the lithium battery filling hole sealing welding system provided in the embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] refer to Figure 1 and Figure 2 The present embodiment provides a sealing welding system for a lithium battery injection hole, comprising a rotary line body 1 and a plurality of battery holders 2 that can move with the rotary line body 1, wherein the battery holder 2 is provided with at least one battery fixing position 21, and a loading mechanism 3 is sequentially arranged along the moving path of the rotary line body 1, for fixing a lithium battery 11 on the battery holder 2; a cleaning mechanism 4 is used to laser clean the metal layer on the surface of the lithium battery 11; a nailing mechanism 5 is used to place a sealing nail on the injection hole; a welding mechanism 6 is used to fix the sealing nail and the injection hole by laser welding; and a unloading mechanism 7 is used to move the welded lithium battery 11 out of the battery holder 2.

[0039] This embodiment completes the assembly line processing of the injection hole sealing welding through multiple workstations, so that each workstation only executes one step, reducing the processing time required for a single workstation, allowing the entire production line to flow and operate, and improving the equipment utilization rate. When the production line is in production, there will be no waiting situation in the previous and next processes due to the time consumed by welding, thereby improving production efficiency.

[0040] refer to Figure 1 The rotary line body 1 includes a chain 12 and a rotary disk 13 at least at both ends of the chain 12, the rotary disk 13 is meshed with the chain 12 for transmission, and a circle of slide rails 14 is also arranged on the outer side of the chain 13, combined with Figure 2 The battery fixing position 21 is fixedly matched with the chain 12, and a slider 22 that slides with the slide rail 14 is provided at the bottom of the battery fixing position 21, so that the battery fixing position 21 is pulled to move by the chain 12, and guided by the slide rail 14, so that the battery fixing position 21 moves along the path of the rotating line body 1. At least one battery fixing position 21 is provided on the battery holder 2 as needed, and multiple lithium batteries 11 can be processed at the same time to improve work efficiency. In this embodiment, each battery holder 2 includes two battery fixing positions 21, and two lithium batteries 11 are driven to circulate and be processed in sequence between each workstation.

[0041] Combination Figure 2 and Figure 3 The battery fixing position 21 includes a bottom plate 22, a first clamping plate 23 and a second clamping plate 24 arranged at both ends of the bottom plate 22, the bottom plate 22 is provided with a receiving groove 25 between the first clamping plate 23 and the second clamping plate 24, the bottom of the lithium battery 11 can be inserted into the receiving groove 25, the first clamping plate 23 is fixedly matched with the side of the lithium battery, and the second clamping plate 24 is provided with a sliding rod 26 sliding toward one side of the first clamping plate 23, and the end of the sliding rod 26 is fixedly connected with a movable block 27, and the sliding rod 26 is sleeved with a tightening spring 28 between the movable block 27 and the second clamping plate 24, and the tightening spring 28 abuts the movable block 27 against the side of the lithium battery 11, and the lithium battery 11 is clamped and fixed by the movable block 27 and the second clamping plate 27 to prevent shaking. When loading and unloading, the movable block 27 or the sliding rod 26 can be pushed by the cylinder to make the movable block 27 leave the side of the lithium battery 11, so as to facilitate the insertion and removal of the lithium battery 11 and the receiving groove 25.

[0042] This embodiment can be used for the welding and sealing processing of the injection holes of conventional cylindrical batteries. For cylindrical batteries, positioning parts 29 at different heights can be set on the first clamping plate 23, and the positioning parts 29 include two rotating wheels 291. The surfaces of the lithium battery 11 are respectively abutted against the two rotating wheels 291, so as to facilitate the adjustment of the angle of the cylindrical battery in subsequent processing so that the injection hole is in a preset position. For lithium batteries 11 of other shapes, the position of the injection hole can be directly determined by its structure without the need for subsequent adjustment.

[0043] refer to Figure 1 and Figure 4 The loading mechanism 3 and the unloading mechanism 7 have the same structure, and each includes a first three-axis motion platform 31. A clamping cylinder 33 is fixed on the first vertical axis 32 of the first three-axis motion platform 31. The clamping cylinder 33 is connected to two clamping claws 34. The clamping cylinder 33 controls the clamping and releasing of the clamping claws 34 by the on-off state with the air circuit. The lithium battery 11 is clamped by the clamping claws 34. The first three-axis motion platform 31 controls the clamping claws 34 to move in space to place the lithium battery 11 on the battery fixing position 21 or remove it from the battery fixing position 21. The first three-axis motion platform 31 is a combination of conventional linear motion structures, connected by a sliding limit structure, and can control linear motion based on a driving structure such as a cylinder, a screw nut, a motor, and a gear, so that the clamping cylinder 33 can move freely in the horizontal, longitudinal, and vertical directions in space. The clamping jaws 34 driven by the cylinder are also implemented by the existing technology, which will not be described in detail in this embodiment. Since the same battery holder 2 fixes the two lithium batteries 11, two groups of clamping jaws 34 are provided to clamp the two lithium batteries 11 at the same time. The spacing between the clamping jaws 34 is set according to the spacing between the two battery fixing positions 21.

[0044] refer to Figure 5 The cleaning mechanism 4 cuts the upper surface of the lithium battery 11 by laser to remove the oxide layer on the surface and complete the cleaning of the lithium battery 11. Specifically, it includes a laser head 41 and a dust removal unit 42. The laser head 41 is fixed on the output end of a cleaning cylinder 44. The cleaning cylinder 44 is arranged in the vertical direction so that the laser head 41 has the freedom of vertical movement. The cleaning cylinder 44 is slidably arranged on a horizontal slide rail 43. The length direction of the horizontal slide rail 43 is parallel to the arrangement direction of the two lithium batteries 11. The laser head 41 can slide along the horizontal slide rail 43 to process the two lithium batteries 11 one by one. The dust removal unit 42 includes a negative pressure pipe 421 and a dust removal chamber 42 connected to the negative pressure pipe 421. 2. The dust removal chamber 422 is provided with a through hole 423 in the vertical direction. The laser head 41 performs laser cutting on the upper surface of the lithium battery 1 through the through hole 423. The metal debris generated after cutting is directly sucked away through the negative pressure tube 421; the dust removal chamber 422 can be fixed on the working platform of the rotary line body 1 through necessary fixing structures, and the dust removal chamber 422 can also have vertical freedom, so that the upper end of the lithium battery 11 can be placed in the dust removal chamber 422 by lowering the height of the dust removal chamber 422. After laser processing, all debris are ensured to be in the dust removal chamber 422 to avoid debris overflowing outward; the horizontal slide rail 43 and the cleaning cylinder can be slidably matched through a conventional linear drive structure.

[0045] refer to Figure 6 and Figure 7 The nail loading mechanism 5 includes a vibration plate 51, a loading channel 52 connected to the vibration plate 51, and a suction nozzle (not shown). The loading channel 52 has at least one outlet 53. In this embodiment, two outlets 53 are provided. The distance between the two outlets 53 is equal to the distance between the two lithium batteries 11, which is convenient for removing the sealing nail and directly installing it in the injection hole. The vibration plate 51 sets the structure and posture adjustment and screening structure of its loading spiral channel according to the structural adaptability of the sealing nail. Finally, the sealing nail that meets the posture requirements enters the loading channel 52 and enters different outlets 53. The suction nozzle reciprocates between the outlet 53 and the lithium battery 11, sucks the sealing nail and places it into the injection hole of the lithium battery 11.

[0046] The suction nozzle is fixed on the second three-axis motion platform 54, and the second three-axis motion platform 54 includes a second transverse slide rail 541, a second longitudinal slide rail 542 slidably arranged on the second transverse slide rail 541 in the transverse direction, and a second longitudinal slide plate 543 slidably arranged on the second longitudinal slide rail 542 in the longitudinal direction. At least one second vertical slide rail (not shown) is arranged on the second longitudinal slide plate 543 in the vertical direction. In this embodiment, two second vertical slide rails are arranged, and a second vertical slide block 543 is slidably arranged on the second vertical slide rail. 44, the suction nozzles are fixed to the lower ends of the second vertical slider 544, the spacing between adjacent suction nozzles is the same as the spacing between adjacent lithium batteries 11, the second vertical slider 544 is fixedly connected to the output end of the second vertical cylinder 545, the suction nozzles can reciprocate along the second transverse slide rail 541 between the outlet 53 of the feeding channel 52 and the injection hole of the lithium battery 11, and at the same time, the second vertical slider 544 is lifted and lowered in the vertical direction to control the vertical lifting and height adjustment of the suction nozzles to complete the suction of the sealing nails and the sealing cooperation with the injection hole.

[0047] refer to Figure 8The welding mechanism 6 includes a pressing unit 61 matched with the injection hole of the lithium battery 11, a third three-axis motion platform 62 fixed on the working platform, and a welding gun 63 installed on the third three-axis motion platform 62. The pressing unit 61 includes a pressing block 612 fixed on a rotating cylinder 611, and an arc-shaped pressing strip 613 is fixedly provided on the pressing block 612. The pressing block 612 can rotate to make the pressing strip 613 press on the sealing pin of the injection hole. When the pressing strip 613 presses on the sealing pin, the sealing pin can be pressed by the welding gun 63. At least two points are spot welded to fix the sealing section on the injection hole, and then the pressure block 612 is controlled to rotate to make the pressure strip 613 leave the sealing pin, and then the welding gun 63 is controlled to fully weld the sealing pin for a circle to complete the sealing of the injection hole. The rotating cylinder 611 is fixed on a lifting platform 614, and the lifting platform 614 is driven by a lifting cylinder 615. The lifting platform 614 is mounted on a plurality of sliding rods for guidance to facilitate cooperation with the lithium battery 11 and prevent interference with the lithium battery 11 following the movement of the rotating line body 1.

[0048] A first visual detection unit 64 is also provided on the third three-axis motion platform 62. The first visual detection unit 64 includes a first camera 641 and a first light source 642 coaxially arranged with the first camera 641 and below the first camera 641. The first light source 642 is a ring-shaped light source. The first light source 642 is above the lithium battery 11. The image of the surface of the lithium battery 11 is obtained through the first visual detection unit 64, and the status of the sealing pins and the pressure strip 613 is detected before the welding operation is performed. The specific image recognition method adopts the existing technology.

[0049] Furthermore, a code scanning mechanism 15 is provided downstream of the feeding mechanism 3, and a QR code is printed on the upper end surface of the lithium battery 11. Fig. 9 The code scanning mechanism 15 has a code scanner 16 arranged above the path of the rotary line body 1, which scans and registers the lithium battery 11 to facilitate production line management and later traceability. The code scanner 16 can be fixedly set to scan and record the passing lithium batteries 11 one by one, or it can be set by a cylinder. When the lithium battery 11 moves to the working position of the code scanning mechanism 15, the cylinder pushes the code scanner 16 to extend to scan and register the lithium battery 11.

[0050] Refer to Figure 1 For cylindrical batteries, since the insertion angle cannot be precisely controlled during loading, the position of the injection hole may deviate from the designed position. A correction mechanism 8 is provided after the loading mechanism 3. The correction mechanism 8 is used to rotate and adjust the lithium battery 11 so that the position of the injection hole on the surface of the lithium battery is at a preset position relative to the axis. Specifically, Fig.10 and Fig.11The correction mechanism 8 includes a second visual detection unit 81 and a correction wheel 82. The second visual detection unit 81 includes a second annular light source 811 located above the lithium battery 11 and at least one second camera 812 located above the second annular light source 811. In this embodiment, two independent second cameras 812 are provided to respectively acquire images for the two lithium batteries 11. The annular light source 811 covers the two lithium batteries 11. After the images are acquired by the second camera 812, the images are processed respectively to identify the position of the injection hole and compared with the preset position to determine the deviation angle between the current position and the preset position. The specific processing process is implemented based on the existing technology.

[0051] The correcting wheel 82 is coupled to a driving wheel (not shown) via a belt 83 , and the driving wheel is fixed to the output end of a driving motor 84 , and the driving motor 84 is fixed to a moving platform 85 , and the moving platform 85 can move so that the correcting wheel 82 contacts the surface of the lithium battery 11 .

[0052] Specifically, a base 86 is fixedly set on the working platform of the rotary line body 1, and the moving platform 85 is slidably set on the base 86. A moving cylinder 861 fixedly matched with the moving platform 85 is fixedly set on the base 86. The moving cylinder 861 drives the moving platform 85 to contact the surface of the lithium battery 11, and determines the rotation direction and angle based on the detection result of the second visual detection unit 81, so as to press the correcting wheel 82 on the surface of the lithium battery, and drive the lithium battery 11 to rotate and adjust the position of the injection hole through the friction force of the belt 83, or a friction wheel 821 is coaxially set below the correcting wheel 82, and the friction wheel 821 contacts the lithium battery 11 and drives it to rotate to adjust the position of the injection hole.

[0053] When driving the lithium battery 11 to rotate, in order to prevent the influence of the movable block 27, a compression cylinder 87 is fixedly arranged under the base 86, and the telescopic end of the compression cylinder 87 is fixedly connected to a pressure plate 871. The movable block 27 has a through groove 271 for accommodating the pressure plate 871. The movable block 27 follows the movement of the rotating line body 1 to make the pressure plate 871 enter the channel 271, and then the telescopic cylinder 87 controls the movement of the pressure plate 871 to make the movable block 27 leave the surface of the lithium battery 11, so that the lithium battery 11 can rotate under the action of the deviation correction wheel 82; after the deviation correction adjustment is completed, the compression cylinder 87 is reset to make the movable block 27 press on the side of the lithium battery 11 again, and the battery holder 2 follows the movement of the rotating line body 1 to make the channel 271 leave the area corresponding to the pressure plate 871.

[0054] Refer to Figure 1A third visual inspection unit 91 is also provided between the nailing mechanism 5 and the welding mechanism 6, and a fourth visual inspection unit 92 is also provided between the welding mechanism 6 and the unloading mechanism 7. The third visual inspection unit 91 is used to detect whether a sealing nail is placed on the injection hole, and the fourth visual inspection unit 92 is used to analyze whether the welding quality meets the requirements. The specific structures of the third visual inspection unit 91 and the fourth visual inspection unit 92 can refer to the structure of the second visual inspection unit 81. For the fourth visual inspection unit 92, a 2D visual camera can be selected to detect whether the sealing nail is offset or missing, or a 3D visual camera can be selected to obtain the defect area under a certain depth of coating and determine whether there are explosion points and pores in the welding. In this embodiment, two of the fourth visual inspection units 92 are respectively arranged downstream of the welding mechanism 6, and a 2D visual camera and a 3D visual camera are respectively arranged. The technology for realizing the above-mentioned quality inspection of the weld based on the 2D visual camera and the 3D visual camera is a prior art, and this application will not repeat it.

[0055] The method for welding the lithium battery filling hole by the lithium battery filling hole sealing welding system provided in this embodiment comprises the following steps:

[0056] S1: The lithium battery 11 is clamped by the clamping claw 34, the lithium battery 11 is moved and fixed into the container 25 by the first three-axis motion platform 31, and the lithium battery 11 is fixed by the movable block 27;

[0057] S2: The lithium battery 11 follows the rotary line 1 to the code scanning mechanism 15, and the code scanner 16 scans and records the code of the code scanning mechanism 15;

[0058] S3: For cylindrical batteries, the lithium battery 11 follows the rotating line body 1 to the position of the correcting mechanism 8, and the movable block 27 is driven to leave the lithium battery 11 through the pressing plate 871, so that the correcting wheel 82 is pressed on the surface of the lithium battery 11, and the correcting wheel 82 is controlled to rotate to drive the lithium battery 11 to rotate and adjust the position of the injection hole;

[0059] S4: the lithium battery 11 after deviation correction enters the cleaning mechanism 4, the upper surface of the lithium battery 11 is cut by the laser head 41, and the dust is removed by adsorption in the dust removal chamber 422;

[0060] S5: After the cleaning is completed, the lithium battery moves to the position of the nailing mechanism 5, the sealing nail is sent to the feeding channel 52 through the vibration plate 51, and the sealing nail is placed in the injection hole through the suction nozzle;

[0061] S6: After the nailing is completed, the third visual inspection unit 91 is used to inspect the nailing effect to prevent the sealing nails from being missing or offset;

[0062] S7: The lithium battery 11 moves to the workstation where the welding mechanism 6 is located, and the sealing pin is pressed by the pressure strip 613. The welding gun 63 spot welds at least two positions on the sealing pin. After spot welding, the pressure strip 613 is separated from the sealing pin, and the welding gun 63 is controlled to fully weld the sealing pin.

[0063] S8: After the welding is completed, the welding position and welding quality are respectively inspected by two fourth visual inspection units 92;

[0064] S9: The lithium battery moves to the position of the unloading mechanism 7, and the first three-axis motion platform 31 controls the clamping claw 34 to remove the lithium battery 11, and the battery holder 2 follows the rotary line body 1 back to the loading mechanism 3 for the next working cycle.

[0065] Through the above method, the process of sealing and welding the injection hole can be decomposed into multiple steps and completed through processing equipment corresponding to multiple workstations, thereby reducing the working time of a single workstation, so that the welding process can match the processing time of upstream and downstream processing processes, will not affect the equipment utilization rate of other processes, and improve production efficiency and automation.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery injection hole sealing welding system, characterized in that: The battery holder comprises a rotating line body and a plurality of battery holders following the movement of the rotating line body, wherein at least one battery fixing position is arranged on the battery holder, and battery holders are arranged in sequence along the moving path of the rotating line body. The feeding mechanism fixes the lithium battery to the battery holder. Cleaning mechanism, laser cleaning of metal surface of lithium battery; A nailing mechanism is used to fix the sealing nail to the injection hole; Welding mechanism, fixing the sealing pin and the injection hole by laser welding; Unloading mechanism, to move the welded lithium battery out of the battery holder; The battery fixing position comprises a bottom plate, a first clamping plate and a second clamping plate arranged at both ends of the bottom plate, the bottom plate is provided with a containing groove between the first clamping plate and the second clamping plate, the bottom of the lithium battery is inserted into the containing groove, the first clamping plate is fixedly matched with the side of the lithium battery, a sliding rod is provided on the second clamping plate to slide toward one side of the first clamping plate, a movable block is fixedly connected to the end of the sliding rod, a tightening spring between the movable block and the second clamping plate is sleeved on the sliding rod, and the tightening spring abuts the movable block against the side of the lithium battery; It also includes a correction mechanism located after the feeding mechanism, the correction mechanism includes a second visual detection unit and a correction wheel, the second visual detection unit includes a second annular light source located above the lithium battery and at least one second camera located above the second annular light source, the correction wheel is matched with a driving wheel through a belt, the driving wheel is fixed to the output end of the driving motor, the driving motor is fixed on a moving platform, and the moving platform can move to make the correction wheel contact with the lithium battery; The moving platform is slidably arranged on a base, a moving cylinder fixedly arranged on the base and fixedly matched with the moving platform, a compression cylinder is also fixedly arranged under the base, a pressure plate is fixedly connected to the telescopic end of the compression cylinder, a through groove for accommodating the pressure plate is provided on the movable block, and the movable block follows the movement of the rotating line body to make the pressure plate enter the channel.

2. A lithium battery filling hole sealing welding system according to claim 1, characterized in that: The rotating line body includes a chain and a rotating disk at least at both ends of the chain, the rotating disk is meshed with the chain for transmission, a circle of slide rails is arranged on the outside of the chain, the battery seat is fixedly matched with the chain, and a slider is arranged at the bottom of the battery seat to slide with the slide rails.

3. A lithium battery filling hole sealing welding system according to claim 1, characterized in that: The lithium battery is a cylindrical battery. The first clamping plate is provided with positioning parts at different heights. The positioning parts include two rotating wheels. The surfaces of the lithium battery are respectively in contact with the two rotating wheels.

4. A lithium battery filling hole sealing welding system according to claim 1, characterized in that: The loading mechanism and the unloading mechanism have the same structure, and each includes a first three-axis motion platform, on the first vertical axis of which is fixed a clamping cylinder, to which is connected at least one clamping claw, and which drives the clamping claw to clamp and release the lithium battery.

5. A lithium battery filling hole sealing welding system according to claim 1, characterized in that: The cleaning mechanism includes a laser head and a dust removal unit. The laser head is fixed on the output end of a cleaning cylinder. The cleaning cylinder is arranged in a vertical direction. The cleaning cylinder is slidably arranged on a horizontal slide rail. The dust removal unit includes a negative pressure pipe and a dust removal chamber connected to the negative pressure pipe. The dust removal chamber is provided with a through hole in the vertical direction. The laser head passes through the through hole to perform laser cutting on the upper surface of the lithium battery.

6. A lithium battery liquid injection hole sealing welding system according to claim 1, characterized in that: The nailing mechanism includes a vibration plate, a feeding channel connected to the vibration plate, and a suction nozzle, the feeding channel has at least one outlet, the spacing between adjacent outlets is the same as the spacing between adjacent lithium batteries, the suction nozzle is fixed on a second three-axis motion platform, the second three-axis motion platform includes a second transverse slide rail, a second longitudinal slide rail arranged on the second transverse slide rail for transverse sliding, and a second longitudinal slide plate arranged on the second longitudinal slide rail for longitudinal sliding, at least one second vertical slide rail is arranged on the second longitudinal slide plate in the vertical direction, a second vertical slider is slidably arranged on each of the second vertical slide rails, the suction nozzles are respectively fixed at the lower ends of the second vertical sliders, the spacing between adjacent suction nozzles is the same as the spacing between adjacent lithium batteries, the second vertical slider is fixedly connected to the output end of the second vertical cylinder, and the suction nozzle can reciprocate between the outlet of the feeding channel and the injection hole of the lithium battery along the second transverse slide rail.

7. A lithium battery filling hole sealing welding system according to claim 1, characterized in that: The welding mechanism includes a clamping unit matched with the lithium battery injection hole, a third three-axis motion platform fixed on the working platform, and a welding gun installed on the third three-axis motion platform; the clamping unit includes a clamping block fixed on a rotating cylinder, an arc-shaped pressure strip is fixedly provided on the clamping block, the clamping block can be rotated to press the pressure strip on the sealing pin of the injection hole, and the welding gun can spot weld or fully weld the sealing pin under the drive of the third three-axis motion platform; The third three-axis motion platform is also provided with a first visual detection unit, which includes a first camera and a first light source coaxially arranged with the first camera and below the first camera, and the first light source is located above the lithium battery.

8. A lithium battery liquid injection hole sealing welding system according to claim 3, characterized in that: A code scanning mechanism is also arranged downstream of the feeding mechanism, a two-dimensional code is printed on the upper end surface of the lithium battery, and the code scanning mechanism has a code scanner arranged above the lithium battery.

9. A lithium battery liquid injection hole sealing welding system according to claim 1, characterized in that: A third visual detection unit is also arranged between the nailing mechanism and the welding mechanism, and the third visual detection unit includes a third annular light source fixedly arranged above the rotating linear body path and at least one third camera located above the third annular light source.

10. A lithium battery liquid injection hole sealing welding system according to claim 1, characterized in that: A fourth visual inspection unit is also arranged between the welding mechanism and the unloading mechanism, and the fourth visual inspection unit includes a fourth annular light source fixedly arranged above the rotating linear body path and a 2D visual camera and / or a 3D visual camera located above the fourth annular light source.

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