Battery pack welding positioning device

Abstract

The utility model relates to the technical field of battery pack welding, and particularly discloses a battery pack welding positioning device which comprises a square battery pack, a laser welding head and a bottom plate, a fixed positioning assembly is arranged above the bottom plate and comprises a supporting plate located above the bottom plate, the upper end of the supporting plate is fixedly connected with four L-shaped positioning plates, and the lower end of the supporting plate is fixedly connected with the laser welding head. The square battery pack is attached to the inner walls of the four L-shaped positioning plates and the upper end of the bottom plate; a second stepping motor drives a second lead screw to complete front-back positioning, after a square battery pack is placed in a rectangular space formed by four L-shaped positioning plates and is clamped and fixed, an X axis and a Y axis are linked to enable a to-be-welded point to be accurately moved to the position below a laser welding head, and an electric push rod drives a lifting plate to vertically press a laser head downwards along a guide rod to a set height for welding. And through cooperation of the fixed positioning assembly and the movable positioning mechanism, the purposes that welding deviation is prevented, and the electrical performance and the structural stability of the square battery pack are prevented from being affected are achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack welding technology, and specifically discloses a battery pack welding positioning device. Background Technology

[0002] In battery manufacturing, the welding quality of the battery pack plays a decisive role in battery performance and safety. The welding of the nickel sheet to the battery terminals is particularly critical. As the core conductive component connecting the battery terminals and enabling stable power transmission, the welding quality of the nickel sheet directly affects the electrical performance and structural stability of the battery pack. If the welding is incomplete, falsely welded, or weak, it will increase contact resistance, generating excessive heat during charging and discharging. This will not only reduce charging and discharging efficiency, affect battery capacity and cycle life, but may also lead to thermal runaway due to localized overheating, seriously threatening battery safety. Therefore, ensuring high-precision, high-quality welding between the nickel sheet and the battery terminals is a necessary condition for ensuring reliable and stable operation of the battery pack, and is of paramount importance for improving overall battery quality and extending its service life.

[0003] In existing technologies, square-structured battery packs are common, typically using a laser welding head to weld and fix nickel sheets to one side of the battery pack's terminal post. When the laser welding head moves upwards, a worker needs to push the entire battery pack to align the welding position with the laser welding head. However, this method, relying on repeated manual adjustments, makes it difficult to accurately align the welding position, easily leading to welding deviations between the laser welding head and the battery pack, thus affecting the battery pack's electrical performance and structural stability. Therefore, a battery pack welding positioning device is urgently needed to solve these problems. Utility Model Content

[0004] This invention proposes a battery pack welding positioning device, which facilitates the precise alignment of the laser welding head with the welding position of the square battery pack, prevents welding deviations, and avoids affecting the electrical performance and structural stability of the square battery pack.

[0005] This utility model is implemented as follows: a battery pack welding and positioning device includes a square battery pack, a laser welding head and a base plate. A fixed positioning component is provided above the base plate. The fixed positioning component includes a support plate located above the base plate. Four L-shaped positioning plates are fixedly connected to the upper end of the support plate. The square battery pack is in contact with the inner walls of the four L-shaped positioning plates and the upper end of the base plate.

[0006] A moving positioning mechanism is provided on the lower side of the support plate. The moving positioning mechanism includes a first U-shaped plate fixedly connected to the upper end of the base plate. A first lead screw is rotatably connected inside the first U-shaped plate. A first moving plate is threadedly connected to the outer wall of the first lead screw. A first stepper motor with its output end fixedly connected to the first lead screw is installed at the rear end of the first U-shaped plate. A second U-shaped plate is fixedly connected to the upper end of the first moving plate. A second lead screw is rotatably connected inside the second U-shaped plate. A second moving plate with its output end fixedly connected to the support plate is threadedly connected to the outer wall of the second lead screw. A second stepper motor with its output end fixedly connected to the second lead screw is installed at the left end of the second U-shaped plate.

[0007] The outer wall of the support plate is provided with a clamping mechanism.

[0008] As a preferred embodiment of the battery pack welding positioning device of this utility model, the clamping mechanism includes upright plates respectively fixedly connected to the left and right ends of the support plate. The outer walls of the two upright plates are threaded with screws. The opposite sides of the two screws are rotatably connected to clamping plates. The opposite sides of the two clamping plates are provided with rubber layers. The opposite sides of the two clamping plates are fixedly connected to sliding rods that penetrate the upright plates and are slidably connected to the upright plates. The opposite sides of the two screws are fixedly connected to handles.

[0009] In a preferred embodiment of the battery pack welding positioning device of this utility model, a frame is fixedly connected to the upper end of the base plate, a top plate is fixedly connected inside the frame, an electric push rod is installed at the upper end of the top plate, the output end of the electric push rod passes through the top plate and is fixedly connected to a lifting plate, the laser welding head is installed at the lower end of the lifting plate, and a guide rod that passes through the top plate and is slidably connected to the upper end of the lifting plate.

[0010] As a preferred embodiment of the battery pack welding positioning device of this utility model, the bottom ends of the inner walls of the first U-shaped plate and the second U-shaped plate are respectively provided with sliding grooves, and the interiors of the two sliding grooves are slidably connected with sliders that are fixedly connected to the first moving plate and the second moving plate respectively.

[0011] As a preferred embodiment of the battery pack welding positioning device of this utility model, a PLC programmable logic controller is installed on the upper end of the top plate, and a switch control box is installed on the upper end of the bottom plate.

[0012] As a preferred embodiment of the battery pack welding positioning device of this utility model, the upper edges of the inner walls of the four L-shaped positioning plates are all chamfered.

[0013] As a preferred embodiment of the battery pack welding positioning device of this utility model, the left and right ends of the base plate are both fixedly connected to mounting plates with multiple mounting holes.

[0014] The beneficial effects of this utility model are:

[0015] The first stepper motor, controlled by a PLC programmable logic controller, drives the first lead screw to achieve horizontal positioning, while the second stepper motor drives the second lead screw to complete front-to-back positioning. After the square battery pack is placed in the rectangular space formed by four L-shaped positioning plates and clamped and fixed, the XY axis is linked to move the point to be welded precisely below the laser welding head. The electric push rod drives the lifting plate to press the laser head vertically down along the guide rod to the set height for welding. The combination of the fixed positioning component and the moving positioning mechanism achieves the purpose of preventing welding deviation and avoiding the impact on the electrical performance and structural stability of the square battery pack. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a front sectional view of the battery pack welding positioning device of this utility model;

[0018] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a partial left-side cross-sectional view of the present invention;

[0020] Figure 4 This is a partial structural diagram of the present invention;

[0021] Figure 5 This is a partial structural diagram of the present invention.

[0022] The markings in the diagram are: 1. Base plate; 2. First U-shaped plate; 3. First lead screw; 4. First moving plate; 5. First stepper motor; 6. Second U-shaped plate; 7. Second lead screw; 8. Second moving plate; 9. Second stepper motor; 10. Support plate; 11. L-shaped positioning plate; 12. Square battery pack; 13. Vertical plate; 14. Screw; 15. Clamping plate; 16. Rubber layer; 17. Slide rod; 18. Frame; 19. Top plate; 20. Electric push rod; 21. Lifting plate; 22. Laser welding head; 23. Guide rod; 24. PLC programmable logic controller; 25. Switch control box. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0024] Please see Figure 1-5 A battery pack welding positioning device includes a square battery pack 12, a laser welding head 22 and a base plate 1. A fixed positioning assembly is provided above the base plate 1. The fixed positioning assembly includes a support plate 10 located above the base plate 1. Four L-shaped positioning plates 11 are fixedly connected to the upper end of the support plate 10. The square battery pack 12 is in contact with the inner walls of the four L-shaped positioning plates 11 and the upper end of the base plate 1.

[0025] A moving positioning mechanism is provided on the lower side of the support plate 10. The moving positioning mechanism includes a first U-shaped plate 2 fixedly connected to the upper end of the base plate 1. A first lead screw 3 is rotatably connected inside the first U-shaped plate 2. A first moving plate 4 is threadedly connected to the outer wall of the first lead screw 3. A first stepper motor 5 with its output end fixedly connected to the first lead screw 3 is installed at the rear end of the first U-shaped plate 2. A second U-shaped plate 6 is fixedly connected to the upper end of the first moving plate 4. A second lead screw 7 is rotatably connected inside the second U-shaped plate 6. A second moving plate 8 with its output end fixedly connected to the support plate 10 is threadedly connected to the outer wall of the second lead screw 7. A second stepper motor 9 with its output end fixedly connected to the second lead screw 7 is installed at the left end of the second U-shaped plate 6.

[0026] The outer wall of the support plate 10 is provided with a clamping mechanism.

[0027] In this embodiment: during use, the first stepper motor 5 and the second stepper motor 9 corresponding to the first lead screw 3 and the second lead screw 7 are first returned to the mechanical origin, and the laser welding head 22 is raised to the initial height to ensure that the coordinate system is zeroed.

[0028] Next, the square battery pack 12 to be welded is placed inside the rectangular positioning space formed by four L-shaped positioning plates 11 on the upper end of the support plate 10. The four sides of the square battery pack 12 are respectively attached to the inner wall of the L-shaped positioning plate 11, and the bottom surface is attached to the upper end of the base plate 1. The four L-shaped positioning plates 11 prevent the square battery pack 12 from moving relative to the support plate 10 in the horizontal direction, thus completing the positioning of the square battery pack 12. Then, the square battery pack 12 is clamped and fixed by the clamping mechanism to prevent it from jumping upward during the welding process.

[0029] When it is necessary to adjust the horizontal position of the square battery pack 12, the PLC programmable logic controller 24 sends an instruction to the first stepper motor 5. The output shaft of the first stepper motor 5 drives the first lead screw 3 to rotate. The thread on the outer wall of the first lead screw 3 drives the first moving plate 4 to move horizontally inside the first U-shaped plate 2. The second U-shaped plate 6 at the upper end of the first moving plate 4 moves synchronously, thereby driving the fixed square battery pack 12 to move precisely in the horizontal direction.

[0030] After horizontal positioning is completed, the PLC programmable logic controller 24 controls the second stepper motor 9 to start, driving the second lead screw 7 to rotate. The second lead screw 7 drives the second moving plate 8 to move in the front-back direction inside the second U-shaped plate 6 through thread transmission. The second moving plate 8 is fixedly connected to the support plate 10, thereby driving the fixed square battery pack 12 to move in the front-back direction. Through the linkage of the X and Y axes, the position of the square battery pack 12 to be welded is accurately aligned with the bottom of the laser welding head 22.

[0031] Upon receiving the instruction from the PLC programmable logic controller 24, the output shaft of the electric push rod 20 pushes the lifting plate 21 to move vertically downward along the guide rod 23. The guide rod 23 is slidably connected to the top plate 19 to ensure smooth lifting and lowering, thereby driving the laser welding head 22 down to the set welding height, so that the laser focus point is accurately applied to the area to be welded between the pole and the nickel sheet of the square battery pack 12, thereby performing welding operations according to the preset program. In combination with the above operations, the device can make the laser welding head 22 accurately correspond to the welding position of the square battery pack 12.

[0032] The cooperation between the fixed positioning component and the moving positioning mechanism achieves the purpose of preventing welding deviations and avoiding any impact on the electrical performance and structural stability of the square battery pack 12.

[0033] As a technical optimization of this utility model, the clamping mechanism includes upright plates 13 fixedly connected to the left and right ends of the support plate 10 respectively. The outer walls of the two upright plates 13 are threadedly connected with screws 14. The opposite sides of the two screws 14 are rotatably connected with clamping plates 15. The opposite sides of the two clamping plates 15 are provided with rubber layers 16. The opposite sides of the two clamping plates 15 are fixedly connected with sliding rods 17 that penetrate the upright plates 13 and are slidably connected to the upright plates 13. The opposite sides of the two screws 14 are fixedly connected with handles.

[0034] In this embodiment: rotating the handles located on the left and right end plates 13 of the support plate 10 drives the screw 14 to rotate. The screw 14 pushes the clamping plate 15 to move towards the square battery pack 12 through thread transmission. The rubber layer 16 on the inner side of the clamping plate 15 contacts the side of the battery pack and applies clamping force. At the same time, the slide rod 17 slides in the sliding hole of the upright plate 13 to ensure that the clamping plate 15 moves smoothly, thereby firmly fixing the square battery pack 12 and preventing it from jumping upward during the welding process.

[0035] As a technical optimization of this utility model, a frame 18 is fixedly connected to the upper end of the base plate 1, a top plate 19 is fixedly connected inside the frame 18, an electric push rod 20 is installed on the upper end of the top plate 19, the output end of the electric push rod 20 passes through the top plate 19 and is fixedly connected to the lifting plate 21, a laser welding head 22 is installed at the lower end of the lifting plate 21, and a guide rod 23 is fixedly connected to the upper end of the lifting plate 21, passing through the top plate 19 and slidingly connected to the top plate 19.

[0036] In this embodiment: the frame 18 at the upper end of the base plate 1 and the top plate 19 form a rigid support structure. The electric push rod 20 is installed above the top plate 19, and its output shaft drives the lifting plate 21 to move vertically along the guide rod 23, thereby driving the laser welding head 22 to move up and down. The sliding connection between the guide rod 23 and the top plate 19 ensures that there is no shaking during the lifting process, and achieves accurate positioning of the height in the vertical direction.

[0037] As a technical optimization of this utility model, the bottom ends of the inner walls of the first U-shaped plate 2 and the second U-shaped plate 6 are respectively provided with sliding grooves, and the interiors of the two sliding grooves are slidably connected with sliders that are fixedly connected to the first moving plate 4 and the second moving plate 8 respectively.

[0038] In this embodiment, by setting two slides and two sliders, the first moving plate 4 and the second moving plate 8 are ensured to move smoothly along a straight line.

[0039] As a technical optimization of this utility model, a PLC programmable logic controller 24 is installed on the upper end of the top plate 19, and a switch control box 25 is installed on the upper end of the bottom plate 1.

[0040] In this embodiment: The PLC programmable logic controller 24 is installed above the top plate 19 and serves as the control core. It receives reset, start and other commands from the switch control box 25, parses the preset welding point coordinates, generates pulse signals to drive the first stepper motor 5, the second stepper motor 9 and the electric push rod 20 to achieve multi-axis linkage positioning. The switch control box 25 serves as the human-machine interface, providing physical operation buttons and status feedback to facilitate operator intervention in equipment operation.

[0041] As a technical optimization of this utility model, the upper edges of the inner walls of the four L-shaped positioning plates 11 are all chamfered.

[0042] In this embodiment: the chamfered edges of the inner walls of the four L-shaped positioning plates 11 form guide slopes. When the square battery pack 12 is placed, the edge of the square battery pack 12 slides into the positioning space along the chamfered slopes and automatically aligns to fit the inner wall, reducing the time and error of manual adjustment and alignment.

[0043] As a technical optimization of this utility model, the left and right ends of the base plate 1 are fixedly connected with mounting plates having multiple mounting holes.

[0044] In this embodiment, multiple mounting holes are opened on the mounting plates at both ends of the base plate 1, and the entire device is fixed to the workbench or production line frame by bolts or screws to achieve rigid installation of the equipment.

[0045] The working principle and usage process of this utility model: When in use, the operator first presses the reset button of the switch control box 25 to perform initial settings, so that the first stepper motor 5 and the second stepper motor 9 corresponding to the first lead screw 3 and the second lead screw 7 return to the mechanical origin. At the same time, the electric push rod 20 drives the laser welding head 22 to rise to the initial height to ensure that the coordinate system is cleared.

[0046] Next, the square battery pack 12 to be welded is placed inside the rectangular positioning space formed by four L-shaped positioning plates 11 on the upper end of the support plate 10. The four sides of the square battery pack 12 are respectively attached to the inner wall of the L-shaped positioning plate 11, and the bottom surface is attached to the upper end of the base plate 1. The chamfered edge of the inner wall of the L-shaped positioning plate 11 is used to facilitate quick alignment of the battery pack and reduce placement errors. The four L-shaped positioning plates 11 prevent the square battery pack 12 from moving relative to the support plate 10 in the horizontal direction, thus completing the positioning and placement of the square battery pack 12.

[0047] Then, rotate the handles located on the left and right ends of the support plate 10 on the upright plates 13 to drive the screw 14 to rotate. The screw 14 pushes the clamping plate 15 to move towards the square battery pack 12 through the thread transmission. The rubber layer 16 on the inner side of the clamping plate 15 contacts the side of the battery pack and applies clamping force. At the same time, the slide rod 17 slides in the sliding hole of the upright plate 13 to ensure that the clamping plate 15 moves smoothly, thereby firmly fixing the square battery pack 12 and preventing it from jumping upward during the welding process.

[0048] When it is necessary to adjust the horizontal position of the square battery pack 12, the PLC programmable logic controller 24 sends a command to the first stepper motor 5. The output shaft of the first stepper motor 5 drives the first lead screw 3 to rotate. The thread on the outer wall of the first lead screw 3 drives the first moving plate 4 to move horizontally inside the first U-shaped plate 2. The second U-shaped plate 6 at the upper end of the first moving plate 4 moves synchronously. The sliding groove at the bottom of the inner wall of the first U-shaped plate 2 cooperates with the slider at the bottom of the first moving plate 4 to ensure that the movement is smooth and without shaking, thereby driving the fixed square battery pack 12 to move accurately in the horizontal direction.

[0049] After horizontal positioning is completed, the PLC programmable logic controller 24 controls the second stepper motor 9 to start, driving the second lead screw 7 to rotate. The second lead screw 7 drives the second moving plate 8 to move in the front-back direction inside the second U-shaped plate 6 through thread transmission. The second moving plate 8 is fixedly connected to the support plate 10, thereby driving the fixed square battery pack 12 to move in the front-back direction. Similarly, the sliding groove on the inner wall of the second U-shaped plate 6 cooperates with the slider of the second moving plate 8 to ensure the accuracy of the front-back movement. Through the linkage of the X and Y axes, the position of the square battery pack 12 to be welded is accurately aligned with the laser welding head 22 directly below.

[0050] The electric actuator 20 is installed above the top plate 19. After receiving the instruction from the PLC programmable logic controller 24, the output shaft of the electric actuator 20 pushes the lifting plate 21 to move vertically downward along the guide rod 23. The guide rod 23 is slidably connected to the top plate 19 to ensure smooth lifting and lowering, thereby driving the laser welding head 22 down to the set welding height, so that the laser focus point is accurately applied to the area to be welded between the pole and the nickel sheet of the square battery pack 12, thereby performing welding operations according to the preset program. In combination with the above operations, the device can make the laser welding head 22 accurately correspond to the welding position of the square battery pack 12.

[0051] The cooperation between the fixed positioning component and the moving positioning mechanism achieves the purpose of preventing welding deviations and avoiding any impact on the electrical performance and structural stability of the square battery pack 12.

[0052] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A battery pack welding positioning device, comprising a square battery pack (12), a laser welding head (22), and a base plate (1), characterized in that: A fixed positioning assembly is provided above the base plate (1). The fixed positioning assembly includes a support plate (10) located above the base plate (1). Four L-shaped positioning plates (11) are fixedly connected to the upper end of the support plate (10). The square battery pack (12) is in contact with the inner wall of the four L-shaped positioning plates (11) and the upper end of the base plate (1). A moving positioning mechanism is provided on the lower side of the support plate (10). The moving positioning mechanism includes a first U-shaped plate (2) fixedly connected to the upper end of the base plate (1). A first lead screw (3) is rotatably connected inside the first U-shaped plate (2). A first moving plate (4) is threadedly connected to the outer wall of the first lead screw (3). A first stepper motor (5) with its output end fixedly connected to the first lead screw (3) is installed at the rear end of the first U-shaped plate (2). A second U-shaped plate (6) is fixedly connected to the upper end of the first moving plate (4). A second lead screw (7) is rotatably connected inside the second U-shaped plate (6). A second moving plate (8) fixedly connected to the support plate (10) is threadedly connected to the outer wall of the second lead screw (7). A second stepper motor (9) with its output end fixedly connected to the second lead screw (7) is installed at the left end of the second U-shaped plate (6). The outer wall of the support plate (10) is provided with a clamping mechanism.

2. The battery pack welding positioning device according to claim 1, characterized in that: The clamping mechanism includes upright plates (13) fixedly connected to the left and right ends of the support plate (10). The outer walls of the two upright plates (13) are threaded with screws (14). The opposite sides of the two screws (14) are rotatably connected with clamping plates (15). The opposite sides of the two clamping plates (15) are provided with rubber layers (16). The opposite sides of the two clamping plates (15) are fixedly connected with sliding rods (17) that penetrate the upright plates (13) and slide with the upright plates (13). The opposite sides of the two screws (14) are fixedly connected with handles.

3. The battery pack welding positioning device according to claim 1, characterized in that: A frame (18) is fixedly connected to the upper end of the base plate (1), and a top plate (19) is fixedly connected inside the frame (18). An electric push rod (20) is installed on the upper end of the top plate (19). The output end of the electric push rod (20) passes through the top plate (19) and is fixedly connected to the lifting plate (21). The laser welding head (22) is installed on the lower end of the lifting plate (21). A guide rod (23) is fixedly connected to the upper end of the lifting plate (21), passing through the top plate (19) and slidingly connected to the top plate (19).

4. The battery pack welding positioning device according to claim 1, characterized in that: The bottom ends of the inner walls of the first U-shaped plate (2) and the second U-shaped plate (6) are respectively provided with sliding grooves, and the interior of the two sliding grooves is slidably connected with sliders that are fixedly connected to the first moving plate (4) and the second moving plate (8).

5. A battery pack welding positioning device according to claim 3, characterized in that: A PLC programmable logic controller (24) is installed on the upper end of the top plate (19), and a switch control box (25) is installed on the upper end of the bottom plate (1).

6. The battery pack welding positioning device according to claim 1, characterized in that: The upper edges of the inner walls of the four L-shaped positioning plates (11) are all chamfered.

7. The battery pack welding positioning device according to claim 1, characterized in that: The base plate (1) is fixedly connected to mounting plates with multiple mounting holes at both its left and right ends.

Images