Welding platform and welding method

Abstract

The invention discloses a welding platform and a welding method, and relates to the technical field of welding machining. The control platform is used for bearing the battery pack and is connected with the control system, and the control platform can drive the battery pack to move on the control platform according to transmission of the control system; the welding system is used for welding the battery pack on the control platform; the visual system is used for photographing and positioning the battery pack on the control platform, the visual system is connected with the control system, the photographed position information of the battery pack is transmitted to the control system, the control system comprises a data storage module, and standard position information is stored in the data storage module. The control system compares the position information, received by the visual system, of the battery pack with standard position information stored in the data storage module, and if errors exist between the position information of the battery pack and the standard position information, the control system controls the control platform to drive the battery pack to the standard position stored in the data storage module. The method has the beneficial effect that the welding quality is high.

Description

Technical Field

[0001] The invention relates to the technical field of welding processing, and in particular to a welding platform and a welding method. Background Art

[0002] In the existing battery pack welding process, the battery pack is placed on the welding platform, and then the battery pack on the welding platform is welded. The welding platform is fixed. After the battery pack is transferred from the previous process to the welding platform of the welding process, the battery pack cannot be displaced and adjusted during welding to make the battery pack in the standard position required for welding. When the battery pack deviates from the required standard position, the light offset point cannot be eliminated, and quality problems such as welding deviation and light blocking will occur during the welding process. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a welding platform and a welding method, which can adjust the position of the battery pack after the battery pack is transferred to the welding process, so that the battery pack is located at the standard position required for welding, thereby avoiding welding quality problems.

[0004] The present invention provides a welding platform, comprising a visual system, a welding system, a control system and a control platform; the control platform is used to carry a battery pack and is connected to the control system, and the control platform can drive the battery pack to move on the control platform according to the signal transmitted by the control system; the welding system is used to weld the battery pack on the control platform; the visual system is used to take a picture and locate the battery pack on the control platform, and the visual system is connected to the control system to transmit the position information of the photographed battery pack to the control system, the control system comprises a data storage module, the data storage module stores standard position information, the control system compares the position information of the battery pack received by the visual system with the standard position information stored in the data storage module, if there is an error between the position information of the battery pack and the standard position information, the control system controls the control platform to drive the battery pack to the standard position stored in the data storage module.

[0005] Optionally, the welding system includes a sliding base and a welding device slidably mounted on the sliding base, the welding platform includes a plurality of the control platforms, and the plurality of control platforms are spaced apart on one side of a sliding path of the welding device, and the welding device is used to weld the battery pack on the control platform.

[0006] Optionally, the data storage module of the control system can also store the position information of the battery pack transmitted by the visual system, and the control system adjusts the position of the battery pack on the control platform according to the comparison between the stored position information of the battery pack and the standard position information.

[0007] Optionally, the welding device makes a linear reciprocating motion on the sliding base, and a plurality of the control platforms are arranged in sequence and spaced apart on one side of the sliding base along the moving direction of the welding device.

[0008] Optionally, the welding device includes a welding head, a mounting seat, a gear and a driving member for driving the gear to rotate, the welding head and the driving member are both mounted on the mounting seat, a rack is provided on the sliding base in the horizontal direction, and the gear is meshed with the rack.

[0009] Optionally, the vision system comprises a camera mounted on the welding device.

[0010] Optionally, the control platform includes a supporting frame, a first conveying unit and a second conveying unit, the first conveying unit and the second conveying unit are connected to the control system; the first conveying unit is installed on the supporting frame, the second conveying unit is installed on the first conveying unit, the first conveying unit drives the second conveying unit to move in a straight line, the battery pack is installed on the second conveying unit, the second conveying unit drives the battery pack to move in a straight line, and the conveying directions of the first conveying unit and the second conveying unit are perpendicular to each other.

[0011] Optionally, there are multiple second conveying units, and the multiple second conveying units are distributed on the first conveying unit in an interval and in parallel.

[0012] Optionally, the first conveying unit includes a first motor and a first sliding block, the supporting frame is provided with a first sliding rail, and the first motor drives the first sliding block to move linearly on the first sliding rail; the second conveying unit includes a second motor, a second sliding block and a second sliding rail, the second sliding rail is installed on the first sliding block, and the second motor drives the second sliding block to move linearly on the second sliding rail, the extension directions of the first sliding rail and the second sliding rail are perpendicular to each other, and the first motor and the second motor are connected to the control system.

[0013] The present invention also provides a welding method, comprising the following steps: S10, arranging a plurality of the control platforms in sequence and at intervals on one side of the sliding base along the moving path of the welding device, the welding device being mounted on the sliding base, and the visual system being mounted on the welding device; S20, the welding device moves on the sliding base to above one of the control platforms, the visual system takes a photo to locate the battery pack on the control platform, and transmits the photographed position information to the control system, and the control system stores the position information in the data storage module; S30, the welding device moves on the sliding base to above another control platform, takes a picture of the battery pack on the control platform, and stores the photographed position information in the data storage module of the control system. At this time, the control system controls the battery pack to move to the standard position on the control platform storing the position information of the battery pack according to the standard position stored in the data storage module; S40, the welding device moves on the sliding base to above the control platform with the welding position adjusted, and welds the battery pack adjusted on the control platform. After welding the battery pack on the control platform, the welding device moves to above the control platform with the welding position adjusted for the next battery pack, and welds the battery pack on the control platform.

[0014] The welding platform and welding method provided by the present invention can perform visual positioning of the battery pack by a visual system before welding the battery pack. If the position of the battery pack deviates from the required standard position, the battery pack is moved and adjusted to the required standard position on the control platform. After the adjustment is completed, the battery pack is welded to improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a structural schematic diagram of a battery pack loaded on a welding platform of the present invention.

[0017] Figure 2 The figure is a schematic structural diagram of a welding platform of the present invention.

[0018] Figure 3 This is a structural schematic diagram of a welding platform of the present invention from another perspective.

[0019] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0020] Figure 5 The figure is a schematic diagram of the structure of a control platform in a welding platform of the present invention.

[0021] In the figure: Visual system 10; Welding system 20, sliding base 21, welding head 22, adjusting arm 23, base 231, rotating arm 232, mounting arm 233, mounting base 24, gear 25, rack 26, motor 27; The control platform 30 , the support frame 31 , the crossbar 311 , the vertical bar 312 , the first transmission unit 32 , the first motor 321 , the first slide rail 322 , the first sliding block 323 , the transmission rod 324 , the second transmission unit 33 , the second motor 331 , the second slide rail 332 , and the second sliding block 333 . DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description 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.

[0023] Unless otherwise clearly specified and limited, the terms "disposed", "installed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0026] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0027] like Figure 1 and Figure 2As shown, this embodiment provides a welding platform for welding battery packs, including a visual system 10, a welding system 20, a control system, and a control platform 30. The control platform 30 is used to carry the battery pack and is connected to the control system signal. The control platform 30 can drive the battery pack to move on the control platform 30 according to the signal transmitted by the control system. The welding system 20 is used to weld the battery pack on the control platform 30. The visual system 10 is used to take a picture and locate the battery pack on the control platform 30, and the visual system 10 is connected to the control system signal to transmit the position information of the photographed battery pack to the control system. The control system includes a data storage module, and the data storage module stores standard position information. The control system compares the position information of the battery pack received by the visual system 10 with the standard position information stored in the data storage module. If there is an error between the position information of the battery pack and the standard position information, the control system controls the control platform 30 to drive the battery pack to the standard position stored in the data storage module.

[0028] In the welding platform provided in this embodiment, when the battery pack is transferred from the operating tool to the control platform 30, the visual system 10 first takes a photo to locate the position of the battery pack on the control platform 30, confirms the position of the battery pack on the control platform 30, and transmits the position information of the battery pack on the control platform 30 to the control system. The control system compares the standard position information pre-stored in its data storage module with the position information captured and located by the visual system 10. If there is an error between the position of the battery pack on the control platform 30 and the standard position, the control system transmits instructions to the control platform 30 to control the control platform 30 to adjust the position of the battery pack on the control platform 30 so that the battery pack is located at the standard position required for welding, and then the battery pack is welded by the welding system 20. In this process, the cooperation between the visual system 10 and the control platform 30 enables the battery pack to be welded in the standard position before welding, which can avoid the light offset point that cannot be eliminated during the welding of the battery pack and the occurrence of quality problems such as welding deviation and light blocking during the welding process.

[0029] Furthermore, the welding system 20 includes a sliding base 21 and a welding device slidably mounted on the sliding base 21. The welding platform includes a plurality of control platforms 30. The plurality of control platforms 30 are spaced apart on one side of the sliding path of the welding device. The welding device is used to weld the battery pack on the control platform 30. When welding the battery pack, by preparing a plurality of control platforms 30 to place the battery pack, when the welding system 20 welds the battery pack on one of the control platforms 30, the battery pack can be prepared on the other control platforms 30. After the welding of the battery pack on one of the control platforms 30 is completed, the welding system 20 moves on the sliding base 21 to the top of the next control platform 30 to weld the battery pack on the control platform 30, which can improve production efficiency.

[0030] Furthermore, the data storage module of the control system can also store the position information of the battery pack transmitted by the visual system 10, and the control system adjusts the position of the battery pack on the control platform 30 according to the comparison between the stored position information of the battery pack and the standard position information. By storing the position information of the battery pack photographed and transmitted by the visual system 10 through the data storage module of the control system, the welding system 20 can weld the battery pack on one of the control platforms 30, while the battery packs on other control platforms 30 that have been photographed and positioned can be compared with the standard position information according to the battery pack position information stored in the data storage module of the control system. If there is an error in the position, the control system transmits instructions to the control platform 30 to adjust the position of the battery pack on the control platform so that the battery pack is located at the standard position and is ready for welding. That is, the welding of the battery pack on one control platform 30 and the position adjustment of the battery pack on other control platforms 30 can be carried out simultaneously. After the welding of the battery pack on one control platform 30 is completed, the welding system 20 can move to the next control platform 30 to weld the battery pack without waiting for the position adjustment of the battery pack on the control platform 30, thereby improving the welding efficiency.

[0031] like Figure 2 and Figure 3 As shown, the welding device moves back and forth in a straight line on the sliding base 21, and a plurality of control platforms 30 are arranged in sequence and spaced along the moving direction of the welding device on one side of the sliding base 21. The welding device moves back and forth in a straight line on the sliding base 21, which can reduce the size of the site occupied by the welding platform compared to the curved or arc-shaped moving path of the welding device.

[0032] Specifically, Figure 3 and Figure 4 As shown, the welding device includes a welding head 22, a mounting seat 24, a gear 25, and a driving member that drives the gear 25 to rotate. The welding head 22 and the driving member are both mounted on the mounting seat 24. A rack 26 is provided on the sliding base 21 in the horizontal direction, and the gear 25 is meshed with the rack 26. When the driving member drives the gear 25 to rotate, since the gear 25 is meshed with the rack 26 on the sliding base 21, the gear 25 drives the mounting seat 24 to move linearly on the sliding base 21, and then drives the welding head 22 on the mounting seat 24 to move linearly. By controlling the forward and reverse rotation of the motor 27, the gear 25 rotates clockwise or counterclockwise, and then the mounting seat 24 can move back and forth linearly on the sliding base 21. By driving the gear 25 and the rack 26, the welding device moves more smoothly and responds quickly. Exemplarily, the driving member can be a motor 27.

[0033] At the same time, if Figure 3As shown, the welding device further includes an adjusting arm 23, which is mounted on a mounting seat 24, and a welding head 22 is mounted on the adjusting arm 23. The adjusting arm 23 includes a base 231, a rotating arm 232 and a mounting arm 233, the base 231 is mounted on the mounting seat 24, the rotating arm 232 has two opposite ends, the rotating arm 232 is pivotally connected to the base 231 and the mounting arm 233 through the opposite ends, one end of the mounting arm 233 is pivotally connected to the rotating arm 232, and the welding head 22 is mounted on the other end of the mounting arm 233. In this way, during welding, the welding head 22 can adjust the position of the welding head 22 above the control platform 30 through the adjusting arm 23, and the adjusting arm 23 is connected to the control system, and the relative position of the welding head 22 and the control platform 30 is automatically adjusted according to the command of the control system.

[0034] In addition, if Figure 3 As shown in , the vision system 10 includes a camera, which can be optionally a CCD camera. The camera is installed on the welding device and is located on one side of the welding head 22, and moves with the welding device. This can simplify the overall structure of the welding platform and there is no need to add a base to install the camera.

[0035] For the control platform 30, Figure 5 As shown in , the control platform 30 includes a support frame 31, a first conveying unit 32 and a second conveying unit 33, and the first conveying unit 32 and the second conveying unit 33 are connected to the control system. The first conveying unit 32 is mounted on the support frame 31, and the second conveying unit 33 is mounted on the first conveying unit 32. The first conveying unit 32 drives the second conveying unit 33 to move in a straight line. The battery pack is mounted on the second conveying unit 33, and the second conveying unit 33 drives the battery pack to move in a straight line. The conveying directions of the first conveying unit 32 and the second conveying unit 33 are perpendicular to each other. The cooperation of the first conveying unit 32 and the second conveying unit 33 enables the battery pack to move relatively vertically horizontally and vertically on the support frame 31. When there is an error between the position of the battery pack captured and positioned by the visual system 10 and the standard position, the battery pack moves horizontally and / or vertically on the support frame 31 through the first conveying unit 32 and the second conveying unit 33, so that the battery pack moves to the standard position.

[0036] Furthermore, there are multiple second conveying units 33, which are spaced and distributed in parallel on the first conveying unit 32. When installing the battery pack, the length direction of the battery pack corresponds to the distribution direction between the multiple second conveying units 33, and the multiple second conveying units 33 can provide a relatively stable support effect for the battery pack. In addition, the spacing between the multiple second conveying units 33 is adjustable. When installing battery packs of different sizes, the multiple second conveying units 33 can adapt to battery packs of different sizes by adjusting the spacing between them.

[0037] Specifically, the support frame 31 includes a plurality of support legs, each of which includes a crossbar 311 and two vertical rods 312 vertically installed on opposite sides of the crossbar 311, and the plurality of support legs are spaced apart and distributed in parallel. The first transmission unit 32 includes a first motor 321, a transmission rod 324, two pairs of bevel gears (not shown), a pulley assembly (not shown), two first screw rods (not shown) and four first sliding blocks 323. Two first slide rails 322 are parallelly and spaced apart on the crossbar 311 of the support frame 31, the two first screw rods are respectively installed in the two first slide rails 322, and the four first sliding blocks 323 are divided into two groups and are respectively connected to the two first screw rods, and the two first sliding blocks 323 in each group are slidably installed on one first slide rail 322. The transmission rod 324 is connected to the output end of the first motor 321 through a pulley assembly. The two rotating wheels of the pulley assembly are respectively connected to the output end of the first motor 321 and one end of the transmission rod 324. The first motor 321 drives the transmission rod 324 to rotate through a belt transmission. A pair of bevel gears are respectively provided between the two ends of the transmission rod 324 and the first screw rod. One bevel gear in each pair of bevel gears is sleeved on the transmission rod 324 and rotates with the transmission rod 324. In the two pairs of bevel gears, the other bevel gear in each pair of bevel gears is sleeved on one end of the two first screw rods. When the transmission rod 324 rotates driven by the first motor 321, the two bevel gears on the transmission rod 324 respectively drive the two first screw rods to rotate, thereby causing the first sliding block 323 to move linearly on the first slide rail 322. The assembly method of the first motor 321, the first screw rod and the first sliding block 323 is currently a mature technology and will not be described in detail here.

[0038] This embodiment includes two second conveying units 33, which are installed on two first slide rails 322 in parallel and at intervals. The second conveying unit 33 includes a second motor 331, a second screw rod (not shown), a second sliding block 333 and a second slide rail 332. One second slide rail 332 is installed corresponding to the two first sliding blocks 323 on the two first slide rails 322, that is, the two ends of a second slide rail 332 are respectively located on two parallel and spaced first slide rails 322, and the two ends of the second slide rail 332 are respectively fixedly connected to the first sliding blocks 323 on the two parallel and spaced first slide rails 322, and the four first sliding blocks 323 support the two second slide rails 332. The second motor 331 drives the second sliding block 333 to move linearly on the second slide rail 332 through the second screw rod. The battery pack is installed on the second sliding block 333. The extension directions of the first slide rail 322 and the second slide rail 332 are perpendicular to each other, so that the battery pack can move horizontally and vertically on the support frame 31, and the battery pack is more flexible when adjusting its position. The first motor 321 and the second motor 331 are connected to the control system. When the battery pack needs to be adjusted horizontally, the control system controls the first motor 321 to drive the first sliding block 323 to move on the first slide rail 322, thereby driving the second slide rail 332 on the first sliding block 323 and the battery pack on the second slide rail 332 to move horizontally. When the battery pack needs to be adjusted vertically, the control system controls the second motor 331 to drive the second sliding block 333 to move on the second slide rail 332, thereby driving the battery pack on the second slide block 333 to move vertically.

[0039] In summary, the welding platform provided in this embodiment can take photos and locate the battery pack on the control platform 30 through the visual system 10, and compare the position information of the photo location with the standard position information stored in the control system. When the position is wrong, the control system controls the battery pack to move on the control platform 30 so that the battery pack is in the standard position, thereby avoiding welding quality problems in the subsequent welding process. In addition, the control system stores the battery pack position information photographed by the visual system 10, so that when the welding system 20 welds the battery pack on one of the control platforms 30, the other control platforms 30 that have stored the battery pack position information can adjust the position of the battery pack at the same time, thereby improving welding efficiency.

[0040] This embodiment also provides a welding method, comprising the following steps: S10, arranging a plurality of the control platforms 30 in sequence and at intervals on one side of the sliding base 21 along the moving path of the welding device, the welding device being mounted on the sliding base 21, and the visual system 10 being mounted on the welding device; S20, the welding device moves on the sliding base 21 to above one of the control platforms 30, the visual system 10 takes a photo to locate the battery pack on the control platform 30, and transmits the photographed position information to the control system, and the control system stores the position information in the data storage module; S30, the welding device moves on the sliding base 21 to above another control platform 30, takes a picture of the battery pack on the control platform 30, and stores the photographed position information in the data storage module of the control system. At this time, the control system controls the battery pack to move to the standard position on the control platform 30 where the position information of the battery pack is stored according to the standard position stored in the data storage module; S40, the welding device moves on the sliding base 21 to above the control platform 30 with the welding position adjusted, and welds the battery pack adjusted on the control platform 30. After welding the battery pack on the control platform 30 is completed, the welding device moves to above the control platform 30 with the welding position adjusted for the next battery pack, and welds the battery pack on the control platform 30.

[0041] In the welding method provided in this embodiment, the battery pack position information captured by the visual system 10 is stored and compared with the pre-stored standard position information, and then the position of the battery pack on the control platform 30 is adjusted by the control system to move the battery pack to the standard welding position. Welding and battery pack position adjustment on different control platforms 30 can be performed simultaneously, thereby improving welding efficiency.

[0042] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A welding platform, characterized in that: The invention comprises a visual system (10), a welding system (20), a control system and a control platform (30); the control platform (30) is used to carry a battery pack and is connected to the control system, and the control platform (30) can drive the battery pack to move on the control platform (30) according to a signal transmitted by the control system; the welding system (20) is used to weld the battery pack on the control platform (30); the visual system (10) is used to take a photo of the battery pack on the control platform (30) to locate the battery pack, and the visual system (10) is connected to the control system to transmit the captured position information of the battery pack to the control system; the control system comprises a data storage module, and the data storage module stores standard position information; the control system compares the position information of the battery pack received by the visual system (10) with the standard position information stored in the data storage module; if there is an error between the position information of the battery pack and the standard position information, the control system controls the control platform (30) to drive the battery pack to the standard position stored in the data storage module.

2. The welding platform according to claim 1, characterized in that: The welding system (20) comprises a sliding base (21) and a welding device slidably mounted on the sliding base (21); the welding platform comprises a plurality of control platforms (30); the plurality of control platforms (30) are arranged at intervals on one side of a sliding path of the welding device; and the welding device is used to weld a battery pack on the control platform (30).

3. The welding platform according to claim 2, characterized in that: The data storage module of the control system is also capable of storing the position information of the battery pack transmitted by the visual system (10), and the control system adjusts the position of the battery pack on the control platform (30) based on the comparison between the stored position information of the battery pack and the standard position information.

4. The welding platform according to claim 3, characterized in that: The welding device moves back and forth in a straight line on the sliding base (21), and a plurality of the control platforms (30) are arranged in sequence and at intervals on one side of the sliding base (21) along the moving direction of the welding device.

5. The welding platform according to claim 4, characterized in that: The welding device comprises a welding head (22), a mounting seat (24), a gear (25), and a driving member for driving the gear (25) to rotate; the welding head (22) and the driving member are both mounted on the mounting seat (24); a rack (26) is provided on the sliding base (21) in a horizontal direction; the gear (25) is meshed with the rack (26).

6. The welding platform according to claim 2, characterized in that: The visual system (10) comprises a camera, which is mounted on the welding device.

7. The welding platform according to claim 1, characterized in that: The control platform (30) comprises a support frame (31), a first conveying unit (32) and a second conveying unit (33), wherein the first conveying unit (32) and the second conveying unit (33) are connected to the control system; the first conveying unit (32) is mounted on the support frame (31), the second conveying unit (33) is mounted on the first conveying unit (32), the first conveying unit (32) drives the second conveying unit (33) to move in a straight line, the battery pack is mounted on the second conveying unit (33), the second conveying unit (33) drives the battery pack to move in a straight line, and the conveying directions of the first conveying unit (32) and the second conveying unit (33) are perpendicular to each other.

8. The welding platform according to claim 7, characterized in that: There are a plurality of the second conveying units (33), and the plurality of the second conveying units (33) are distributed on the first conveying unit (32) in an interval and in parallel.

9. The welding platform according to claim 8, characterized in that: The first transmission unit (32) comprises a first motor (321) and a first sliding block (323); a first sliding rail (322) is provided on the support frame (31); the first motor (321) drives the first sliding block (323) to move linearly on the first sliding rail (322); the second transmission unit (33) comprises a second motor (331), a second sliding block (333) and a second sliding rail (332); the second sliding rail (332) is installed on the first sliding block (323); the second motor (331) drives the second sliding block (333) to move linearly on the second sliding rail (332); the extension directions of the first sliding rail (322) and the second sliding rail (332) are perpendicular to each other; the first motor (321) and the second motor (331) are connected to the control system.

10. A welding method, characterized in that: The following steps are involved: S10, arranging a plurality of the control platforms (30) in sequence and at intervals on one side of the sliding base (21) along a moving path of the welding device, the welding device being mounted on the sliding base (21), and the visual system (10) being mounted on the welding device; S20, the welding device moves on the sliding base (21) to above one of the control platforms (30), the visual system (10) takes a photo to locate the battery pack on the control platform (30), and transmits the photographed position information to the control system, and the control system stores the position information in the data storage module; S30, the welding device moves on the sliding base (21) to above another control platform (30), takes a photo of the battery pack on the control platform (30), and stores the photographed position information in the data storage module of the control system; at this time, the control system controls the battery pack to move to the standard position on the control platform (30) storing the position information of the battery pack according to the standard position stored in the data storage module; S40, the welding device moves on the sliding base (21) to the top of the control platform (30) whose welding position has been adjusted, and welds the battery pack whose position has been adjusted on the control platform (30). After the welding of the battery pack on the control platform (30) is completed, the device moves to the top of the control platform (30) where the welding position of the next battery pack has been adjusted, and welds the battery pack on the control platform (30).

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