A laser welding equipment for roll-formed beam battery pack frames

Abstract

This application relates to a laser welding equipment for a roll-formed beam battery pack frame, belonging to the technical field of laser welding of battery pack frames. It includes a base, a laser welding robot mounted on one side of the frame, a welding worktable mounted on the base, and a rotary table mounted on the base for rotating the welding worktable. The welding worktable is further equipped with a bonding component for stably fitting and tightening the bottom frame and the crossbeam, and a suppression component for suppressing deformation on the welding side of the crossbeam. The base is rotatably mounted on the ground, and the rotation axis of the base is perpendicular to the rotation axis of the welding worktable. This application effectively reduces welding deformation during the welding process of the roll-formed beam frame, improves the welding quality of the battery pack frame, and thus improves the assembly adaptability of the battery pack frame.

Description

Technical Field

[0001] This application relates to the technical field of laser welding of battery packs, and in particular to a laser welding device for a roll-formed beam battery pack frame. Background Technology

[0002] New energy vehicles represent a crucial direction for the future development of the automotive industry, and driving range, as a key indicator of the core performance of electric vehicles, has received widespread attention from the market and industry. Vehicle weight is a significant factor affecting the driving range of electric vehicles; therefore, achieving lightweighting while maintaining the structural strength of the vehicle body and related components is one of the current development directions in the automotive industry.

[0003] Common battery pack frames include crossbeams, side beams, and a bottom frame. Side beams are welded to side beams, crossbeams to side beams, and crossbeams to the bottom frame. To reduce weight while increasing the strength of the battery pack frame, roll forming welding is used. However, CMT welding involves a large heat input, which can easily cause uncontrollable thermal deformation of the roll forming beams during the welding process. This can affect the dimensional accuracy of the battery pack frame, reduce assembly compatibility, and require additional filler wire, increasing both cost and overall weight of the battery pack frame.

[0004] Therefore, some existing technologies use laser welding to weld roll-formed beam battery packs. This method reduces the heat input during CMT welding and reduces some welding deformation. However, since the roll-formed beam frame is hollow and the hollow wall is very thin, especially during welding, laser welding still generates some heat. During the cooling process after welding, the middle part of the welded side will still be concave towards the hollow, and the two ends of the welded side will warp. Therefore, there is still room for improvement. Summary of the Invention

[0005] In order to reduce welding deformation during the welding process of roll forming beam frame, improve the welding quality of battery pack frame, and thus improve the assembly adaptability of battery pack frame, this application provides a laser welding equipment for roll forming beam battery pack frame.

[0006] This application provides a laser welding equipment for a roll-formed beam battery pack frame, which adopts the following technical solution:

[0007] A laser welding equipment for a roll-formed beam battery pack frame includes a base, a laser welding robot mounted on one side of the frame, a welding worktable mounted on the base, and a rotary table mounted on the base for rotating the welding worktable. The welding worktable is also provided with a bonding component for stably fitting and pressing the bottom frame and the crossbeam together, and a suppression component for suppressing deformation on the welding side of the crossbeam. The base is rotatably mounted on the ground, and the rotation axis of the base is perpendicular to the rotation axis of the welding worktable.

[0008] The bonding assembly includes a first abutting block and a second abutting block disposed on the welding worktable. The second abutting block is movably bonded to the side of the bottom frame away from the crossbeam, and the first abutting block is movably bonded to the side wall of the crossbeam. The welding worktable is also provided with a first power member for rotating the first abutting block and a second power member for sliding the second abutting block.

[0009] The suppression component includes a beam deformation suppression component corresponding to the first abutment block, a bottom frame deformation suppression component corresponding to the second abutment block, and an adjustment component that uniformly adjusts the degree of beam deformation and the degree of bottom frame deformation suppression.

[0010] The crossbeam deformation suppression component includes a first deformation suppression block that is slidably disposed on the first abutment block. The first deformation suppression block is in contact with the side wall of the crossbeam, and a first adsorption hole is provided on the first deformation suppression block. The welding workbench is also provided with a negative pressure component that generates negative pressure in the first adsorption hole.

[0011] The bottom frame deformation suppression component includes a second deformation suppression block that is slidably disposed on the second abutment block. The second deformation suppression block has a second adsorption hole. The negative pressure component generates negative pressure towards the second adsorption hole. The adjusting component is used to adjust the negative pressure in the first adsorption hole and the second adsorption hole. The welding worktable is also provided with a driving component that slides the first deformation suppression block and the second deformation suppression block.

[0012] By adopting the above technical solution, when welding the battery pack frame, the base can rotate as a whole on the ground, and the welding worktable can rotate under the drive of the rotary table. The two rotation axes are perpendicular to each other, thus meeting the requirements of multi-directional and multi-angle laser welding. The first power component drives the first clamping block to rotate and abut against the side wall of the crossbeam, and the second power component drives the second clamping block to slide and abut against the side of the bottom frame away from the crossbeam, so that the bottom frame and the crossbeam maintain a stable fit before and during welding. The first deformation suppression block of the crossbeam deformation suppression component is arranged synchronously with the first clamping block and fits against the side wall of the crossbeam. The negative pressure component forms a negative pressure adsorption on the crossbeam through the first adsorption hole. The second deformation suppression block of the bottom frame deformation suppression component is arranged synchronously with the second clamping block and fits against the side wall of the bottom frame. The negative pressure component simultaneously forms a negative pressure adsorption on the bottom frame through the second adsorption hole. The adjustment component can adjust the negative pressure in the first adsorption hole and the second adsorption hole respectively. The driving component can drive the first deformation suppression block and the second deformation suppression block to slide along the welding direction.

[0013] Most roll-formed battery pack frame welding equipment only has simple positioning functions, making it difficult to apply continuous and stable constraints to the crossbeam and bottom frame during the high-temperature cooling stage after welding. This easily leads to problems such as warping, concavity, and dimensional deviations in the workpiece due to thermal stress, and it is also difficult to adjust the constraint strength according to workpiece differences. This solution achieves reliable workpiece positioning through bonding components. During the welding cooling stage, crossbeam deformation suppression components and bottom frame deformation suppression components respectively form adsorption constraints on the crossbeam and bottom frame. With the help of adjustment components, the negative pressure can be adjusted, which can effectively reduce welding thermal deformation, improve the dimensional accuracy and structural stability of the battery pack frame, and the dual-axis rotation structure can improve the operational flexibility and applicability of the welding equipment.

[0014] Optionally, the suppression component further includes a lubricating element, which includes a positive pressure element disposed on the first deformation suppression block / second deformation suppression block. The first deformation suppression block has fine lubrication holes on the outer periphery of the first adsorption hole, and the second deformation suppression block has fine lubrication holes on the outer periphery of the second adsorption hole. The lubrication holes are evenly spaced.

[0015] By adopting the above technical solution, during the sliding process of the first and second deformation suppression blocks, the positive pressure component moves and outputs a small amount of positive pressure airflow through the lubrication holes on the outer periphery of the first adsorption hole on the first deformation suppression block and the lubrication holes on the outer periphery of the second adsorption hole on the second deformation suppression block. Traditional sliding adsorption structures are prone to movement jamming and obstruction due to excessive friction on the contact surface during sliding. Instable sealing can also lead to negative pressure leakage, affecting the adsorption effect. Furthermore, the use of oil lubrication can easily contaminate the workpiece and weld. This solution reduces sliding friction resistance by uniformly distributing lubrication holes around the adsorption holes and forming a small air film, without using oil-based media. This ensures smooth movement of the first and second deformation suppression blocks, while the outer air film improves the sealing of the adsorption area, reduces negative pressure loss, and makes the adsorption force more stable. This ensures a continuous and reliable deformation suppression effect, which is beneficial for improving welding quality and workpiece surface integrity.

[0016] Optionally, the negative pressure component includes a negative pressure air pump mounted on the welding workbench. The welding workbench is provided with a first connecting pipe for connecting the negative pressure air pump to the first adsorption hole and a second connecting pipe for connecting the negative pressure air pump to the second adsorption hole. The adjusting component includes a first mounting block mounted on the first deformation suppression block and a second mounting block mounted on the second deformation suppression block. The first connecting pipe is mounted on the first mounting block, and the second connecting pipe is mounted on the second mounting block. A first adjusting block is slidably mounted on the first mounting block, and a second adjusting block is slidably mounted on the second mounting block. The first adjusting block adjusts the size of the channel through which the first connecting pipe passes through the first mounting block, and the second adjusting block adjusts the size of the channel through which the second connecting pipe passes through the second mounting block.

[0017] By adopting the above technical solution, the negative pressure air pump provides negative pressure adsorption force to the first and second adsorption holes respectively through the first and second connecting pipes. The first and second adjusting blocks can independently change the flow cross-sectional area of ​​the corresponding pipes through sliding action, thereby realizing the separate adjustment of the adsorption negative pressure on the beam side and the bottom frame side. Existing welding equipment is not easy to differentiate constraints based on the differences in thickness, heat dissipation, and deformation trends between the beam and the bottom frame. It is easy to have insufficient constraints on thin-walled parts and excessive constraints on thick-walled parts, making it difficult to balance deformation suppression effect and workpiece stress safety. By setting the first and second adjusting blocks to independently adjust the adsorption strength of the beam and the bottom frame, the appropriate constraint force can be matched according to the actual welding conditions, material thickness, and heat input, improving the accuracy and adaptability of deformation suppression. It can effectively suppress thermal deformation during the welding cooling process and reduce the risk of local dents and deformation damage to the workpiece due to excessive adsorption force, thereby improving the stability of the welding process and the yield of finished products.

[0018] Optionally, a first support is rotatably mounted on the welding worktable, the first abutting block is rotatably mounted on the first support, an adjusting gear is provided at the pivot of the first support, and a first compression cavity is provided inside the first support. An adjusting rack is slidably mounted on the first support, and the adjusting rack meshes with the adjusting gear. A first piston plate is provided inside the first compression cavity, and the adjusting rack is connected to the first piston plate. A second compression cavity is also provided on the first mounting block, and the first compression cavity and the second compression cavity are interconnected. The first adjusting block is located inside the second compression cavity, and the first piston plate is in contact with the inner peripheral wall of the first compression cavity. The adjusting block is in contact with the inner peripheral wall of the second compression cavity.

[0019] By adopting the above technical solution, when the first clamping block clamps and positions beams of different thicknesses, its rotation can drive the adjusting gear to rotate, thereby driving the adjusting rack and the first piston plate to move within the first compression cavity. This, in turn, uses pneumatic linkage to push the first adjusting block within the second compression cavity, automatically changing the size of the negative pressure channel to adjust the adsorption force. In traditional welding devices, the adsorption force is often a fixed value preset manually, making it difficult to automatically adapt and adjust according to the workpiece thickness. For thin-walled beams, due to their weaker rigidity and more significant welding thermal deformation, insufficient deformation suppression often occurs, while for thick-walled beams, excessive constraint is likely. By forming a purely mechanical linkage structure between the clamping stroke and negative pressure adjustment, the smaller the beam thickness, the larger the rotation stroke of the first clamping block, and the corresponding adsorption negative pressure automatically increases. This achieves adaptive enhancement of deformation suppression based on workpiece thickness, eliminating the need for manual parameter adjustment, simplifying the welding debugging process, improving the continuity, stability, and reliability of the automated welding process, and contributing to improved consistency in the welding quality of beams of different specifications.

[0020] Optionally, the second abutting block is provided with a third compression cavity, and the second mounting block is provided with a fourth compression cavity. A second piston plate is slidably disposed in the third compression cavity, and the third compression cavity is connected to the fourth compression cavity. The second piston plate is in contact with the inner peripheral wall of the third compression cavity, and the second adjusting block is in contact with the inner peripheral wall of the fourth compression cavity.

[0021] By adopting the above technical solution, when the second clamping block clamps and positions the bottom frame of different thicknesses, its movement stroke can drive the second piston plate to move in the third compression cavity, and through pneumatic linkage, drive the second adjusting block in the fourth compression cavity to move, thereby realizing the automatic adjustment of the negative pressure adsorbed on the bottom frame side. During the laser welding process, the bottom frame is usually thinner and less rigid. Under the same heat input conditions, the deformation of the bottom frame is often greater than that of the crossbeam. Traditional devices are difficult to differentiate and adaptively constrain this characteristic, and are prone to problems such as bottom frame warping, severe shrinkage, and excessive flatness of the overall frame.

[0022] The second adjusting block is adjusted by the stroke of the second clamping block to automatically match the adsorption force. The smaller the thickness of the bottom frame and the larger the clamping stroke, the higher the adsorption force. This can specifically strengthen the constraint on the cooling and shrinkage of the thin-walled bottom frame, effectively suppress the warping, concavity and uneven shrinkage of the bottom frame during the welding process, and make the deformation trend of the crossbeam and the bottom frame more coordinated and consistent, significantly improving the overall dimensional accuracy and structural stability of the battery pack frame.

[0023] Optionally, the driving component includes a fixing frame disposed on the first abutting block / second abutting block, a fixing screw rotatably disposed on the fixing frame, the first deformation suppression block / second deformation suppression block being threaded onto the fixing screw, and the fixing frame also being provided with a first power source for rotating the fixing screw.

[0024] By adopting the above technical solution, the first power source drives the fixed lead screw to rotate, and through threaded transmission, the first deformation suppression block and the second deformation suppression block move smoothly along the welding trajectory. Traditional deformation suppression structures are mostly fixed or segmented, which are not easy to move synchronously with the welding area. The constraint area and the weld cooling area are prone to misalignment, making it difficult to provide effective constraint at the stage of maximum thermal stress and highest deformation risk, resulting in limited deformation suppression effect.

[0025] The deformation suppression block is moved continuously, smoothly, and with high precision by a lead screw drive, so that the adsorption constraint area always moves synchronously with the welding area. This ensures that the weld enters a constrained cooling state immediately after welding, continuously and stably suppressing thermal stress deformation, improving the weld formation quality and dimensional uniformity. At the same time, the threaded drive structure has smooth movement, high positioning accuracy, and strong reliability, which is conducive to maintaining a stable deformation suppression effect under long-term continuous production conditions.

[0026] Optionally, the welding workbench is equipped with an infrared sensor and a controller. The controller and the infrared sensor are electrically connected to the first power source. When the welding robot moves to the welding area to weld the connection between the bottom frame and the crossbeam, the infrared sensor measures the distance of the movement trajectory of the welding head and transmits the signal to the controller. The controller controls the movement of the first power source so that the first deformation suppression block and the second deformation suppression block are always located on the welded side of the welding head.

[0027] By adopting the above technical solution, the infrared sensor can easily detect the position information and movement trajectory of the welding head in real time and feed the signal back to the controller. The controller dynamically controls the action of the first power source according to the welding progress, so that the first deformation suppression block and the second deformation suppression block always accurately follow the side of the welding head that has been welded. Traditional following constraint structures mostly use preset programs or timing control, which are difficult to match the changes in welding speed and trajectory adjustment in real time. They are prone to problems such as following lag, leading, or deviation, and are not easy to accurately act on the critical cooling stage when the weld temperature is the highest and the deformation is the most intense. By setting the deformation suppression block and the welding head to be linked in real time and accurately follow each other, the adsorption constraint effect is concentrated on the cooling stage when the weld has just been welded, the temperature is the highest, and the thermal stress is the greatest. This maximizes the suppression of welding deformation, improves the welding quality and dimensional accuracy, and at the same time improves the automation and intelligence level of the equipment, reduces manual intervention, and improves the production line operating efficiency and product stability.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. By setting a first clamping block, a second clamping block, and first and second deformation suppression blocks, during the welding process, the first and second clamping blocks clamp and position the crossbeam and the bottom frame respectively, and the first and second deformation suppression blocks simultaneously adhere to the workpiece and are adsorbed by negative pressure. Combined with the linkage adjustment of clamping stroke and negative pressure, the welding thermal deformation of the crossbeam and the bottom frame is effectively suppressed, thereby improving the welding accuracy and structural stability of the battery pack frame.

[0030] 2. By setting up lubrication holes, a lead screw drive structure, and an independent negative pressure adjustment component, a small amount of air film is formed in the lubrication holes and the lead screw drive achieves smooth movement as the deformation suppression block slides along the welding trajectory. At the same time, the independent negative pressure adjustment component flexibly adjusts the adsorption force to ensure smooth sliding and accurate positioning of the deformation suppression block, expands the adaptability of the equipment to workpieces of different specifications, and improves production efficiency.

[0031] 3. By setting up a dual-axis rotating structure, infrared sensors, and a controller, during the welding robot's operation, the dual-axis rotating structure adjusts the welding angle, the infrared sensors detect the welding head trajectory and provide feedback signals, and the controller drives the deformation suppression block to follow in real time, thereby achieving flexible adjustment of the welding operation and precise following of the deformation suppression block, reducing manual intervention and ensuring consistent welding quality. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the connection structure between the crossbeam and the bottom frame in an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the overall structure of a laser welding equipment for a roll-formed beam battery pack frame according to an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the connection structure of the welding workbench;

[0036] Figure 4 This is a schematic diagram of the connection structure between the first adjusting block and the second adjusting block;

[0037] Figure 5 This is a schematic diagram of the connection structure between the first mounting block and the second mounting block;

[0038] Figure 6 This is a schematic diagram of the connection structure of the welding workbench from a second-person perspective;

[0039] Figure 7 yes Figure 6 A schematic diagram of the connection structure of part A in the middle;

[0040] Figure 8 This is a schematic diagram of the connection structure of the welding workbench from a third-person perspective;

[0041] Figure 9 yes Figure 8 A schematic diagram of the connection structure of section B;

[0042] Figure 10 This is a schematic diagram of the connection structure of the fixed frame and the driving component;

[0043] Figure 11 This is a schematic diagram of the connection structure of the fastener and the fixing screw.

[0044] Reference numerals: 1. Base; 12. Crossbeam; 13. Base frame; 2. Laser welding robot; 3. Fitting assembly; 31. First clamping block; 311. First support; 32. Second clamping block; 34. Second power component; 4. Suppression assembly; 41. Crossbeam deformation suppression component; 411. First deformation suppression block; 412. First suction hole; 42. Base frame deformation suppression component; 421. Second deformation suppression block; 422. Second suction hole; 43. Adjusting component; 431. First mounting block; 432. Second mounting block; 433. First adjusting block; 434. Second adjusting block; 44. Drive component; 441. Fixing frame; 442. Fixing screw; 443. First power component Source; 45. Lubricating component; 451. Miniature air pump; 452. Lubrication hole; 46. Negative pressure air pump; 461. First connecting pipe; 462. Second connecting pipe; 47. Adjusting gear; 48. Adjusting rack; 49. First piston plate; 491. Second piston plate; 492. First compression cavity; 493. Second compression cavity; 494. Third compression cavity; 495. Fourth compression cavity; 5. Rotary table; 6. Welding workbench; 7. Infrared sensor; 8. Controller. Detailed Implementation

[0045] First, it should be noted that when welding to form the battery pack frame, the crossbeam 12 needs to be welded to the bottom frame 13. The width of the bottom frame 13 is slightly wider than the width of the crossbeam 12. During the welding process, the crossbeam 12 and the bottom frame 13 are usually pressed vertically together. Since the crossbeam 12 will later need to be fitted with longitudinal beams, multiple clamping slots for the longitudinal beams are provided on the crossbeam 12. Therefore, if the crossbeam 12 is placed perpendicular to the surface of the welding workbench, the clamping slots are prone to deformation during the horizontal clamping process. Therefore, during the welding process, the technicians arrange the bottom frame perpendicular to the welding workbench 6 and the crossbeam 12 parallel to the surface of the welding workbench 6. A limiting structure corresponding to the clamping slots is provided on the welding workbench at the corresponding positions of the clamping slots, so that the clamping slots are not easily deformed during the horizontal clamping process. (See attached diagram) Figure 1 As shown.

[0046] The following is in conjunction with the appendix Figure 2-11 This application will be described in further detail.

[0047] This application discloses a laser welding device for a roll-formed beam battery pack frame. (Refer to...) Figure 1 As shown in Figure 8, a laser welding equipment for a roll-formed beam battery pack frame includes a base 1, a laser welding robot 2, a welding worktable 6, and a rotary table 5.

[0048] The laser welding robot 2 is fixed to one side of the base 1, the rotary table 5 is rotatably mounted on the base 1, and the welding worktable 6 is rotatably mounted on the rotary table 5. The rotary table 5 is located between the base 1 and the welding worktable 6.

[0049] The base 1 is connected to the ground and rotates around an axis perpendicular to the ground. The rotation axis of the welding worktable 6 is arranged in the horizontal direction. The rotary table 5 can drive the welding worktable 6 to rotate up and down around the horizontal rotation axis. The rotation axes of the base 1 and the welding worktable 6 are perpendicular to each other.

[0050] The base 1 and the rotary table 5 rotate in tandem, enabling multi-directional and multi-angle welding, meeting the welding requirements of different positions of the roll-formed beam battery pack frame, and eliminating welding blind spots.

[0051] If the crossbeam 12 and the bottom frame 13 are not firmly positioned or have insufficient fitting accuracy in the early stage of welding, problems such as weld misalignment and poor forming are likely to occur. Fitting components 3 and suppression components 4 are set on the welding workbench 6 accordingly.

[0052] The bonding component 3 includes a first abutting block 31, a second abutting block 32, a first power component, and a second power component 34, which are used to achieve precise positioning and stable bonding between the crossbeam 12 and the bottom frame 13. As shown in the figure, the first abutting block 31 and the second abutting block 32 are evenly spaced in multiple sets along the length of the crossbeam 12. The first abutting block 31 is bonded to the side wall of the crossbeam 12 to keep the crossbeam 12 stably positioned on the welding workbench 6. The second abutting block 32 is bonded to the side wall of the bottom frame 13 away from the crossbeam 12 to keep the joint between the crossbeam 12 and the bottom frame 13 stable and to make the weld uniform. The suppression component 4 is used to control the thermal deformation of the workpiece during the welding process and the cooling stage.

[0053] The first power component is a servo motor, which is fixed on the welding workbench 6. Its output shaft is connected to the first abutment block 31, which can drive the first abutment block 31 to rotate around an axis parallel to the surface of the welding workbench 6, so as to achieve contact or separation with the side wall of the crossbeam 12.

[0054] The second power component 34 is a cylinder, which is fixed to the bottom of the welding workbench 6. Its piston rod is connected to the second abutment block 32. When the piston rod extends and retracts in the horizontal direction, it can drive the second abutment block 32 to slide, so as to achieve contact or separation with the side of the bottom frame 13 away from the crossbeam 12.

[0055] The first clamping block 31 and the second clamping block 32 cooperate to ensure that the crossbeam 12 and the bottom frame 13 maintain a stable fit in the early stage and during the welding process, thus avoiding poor weld formation due to loosening of the workpiece.

[0056] During the welding process and the cooling stage after welding, the crossbeam 12 and the bottom frame 13 are affected by thermal stress and are prone to deformation such as warping and concavity during the cooling process. The deformation of thin-walled structures is more obvious, especially since the cooling of laser welding is relatively rapid. The welding surface of the crossbeam 12 will be concave towards the welding worktable 6, while the welding surface of the bottom frame 13 will be concave away from the crossbeam 12. Therefore, a suppression component 4 is also provided on the welding worktable 6 to solve this problem. The suppression component includes a crossbeam deformation suppression component 41, a bottom frame deformation suppression component 42, an adjustment component 43, a driving component 44, a lubricating component 45, a negative pressure air pump 46, an adjusting gear 47, an adjusting rack 48, a first piston plate 49, a second piston plate 491, a first compression cavity 492, a second compression cavity 493, a third compression cavity 494, a fourth compression cavity 495, and a connecting pipe.

[0057] The crossbeam deformation suppression component 41 is provided corresponding to the crossbeam 12. It includes a first deformation suppression block 411 slidably disposed on the first abutment block 31. The first deformation suppression block 411 is slidably disposed on multiple first abutment blocks 31. A fixing frame 441 is fixedly connected to the side of multiple first abutment blocks 31 near the bottom frame 13. The fixing frame 441 is U-shaped and the arrangement direction of the fixing frame 441 is consistent with the length direction of the crossbeam 12. The first deformation suppression block 411 is slidably disposed on the fixing frame 441, and the sliding direction of the first deformation suppression block 411 is consistent with the length direction of the crossbeam 12.

[0058] The bottom frame deformation suppression component 42 is provided corresponding to the bottom frame 13. It includes a second deformation suppression block 421. A U-shaped fixing frame 441 is fixedly connected to one side of the multiple second abutting blocks 32 near the crossbeam 12. The second deformation suppression block 421 is slidably disposed on the fixing frame 441. The sliding direction of the second deformation suppression block 421 is consistent with the length direction of the crossbeam 12.

[0059] The surface of the first deformation suppression block 411 is in close contact with the side wall of the crossbeam 12, and a first adsorption hole 412 is provided thereon; the surface of the second deformation suppression block 421 is in close contact with the side wall of the bottom frame 13, and a second adsorption hole 422 is provided thereon.

[0060] Reference Figure 4 The adjusting components include a negative pressure air pump 46 fixed to the welding workbench. The negative pressure air pump 46 is provided with a first connecting pipe 461 and a second connecting pipe 462. A first mounting block 431 is fixedly connected to one end of the fixing frame 441 corresponding to the crossbeam 12, and a second mounting block 432 is fixedly connected to one end of the fixing frame 441 corresponding to the bottom frame 13. The first connecting pipe 461 is connected to the first mounting block 431, and the second connecting pipe 462 is connected to the second mounting block 432. The section of the fixing frame 441 parallel to the crossbeam 12 is hollow. A negative pressure pipe is provided in the cavity of the fixing frame 441. One end of the negative pressure pipe is connected to the first mounting block 431 / second mounting block 432, and the other end of the negative pressure pipe is connected to the first adsorption hole 412 / second adsorption hole 422. The end of the first connecting pipe 461 away from the first mounting block 431 and the end of the second connecting pipe 462 away from the second mounting block 432 are both connected to the negative pressure air pump 46. The negative pressure air pump 46 provides stable negative pressure to the two adsorption holes, forming a continuous adsorption constraint on the crossbeam 12 and the bottom frame 13, reducing the amount of thermal deformation during the welding cooling stage, making it less likely for the crossbeam 12 and the bottom frame 13 to dent, and improving the welding forming accuracy.

[0061] Since the first deformation suppression block 411 and the second deformation suppression block 421 need to slide synchronously with the welding trajectory, if the frictional resistance is too large during the sliding process, movement will be stuck or delayed, and pressure will be released from the adsorption surface, affecting the deformation suppression effect. Using oil lubrication will easily contaminate the weld and the workpiece, and using oil lubrication during laser welding is prone to deflagration. Therefore, this application provides a lubricating element 45 to solve the problem of the sliding process of the first deformation suppression block 411 / second deformation suppression block 421.

[0062] The lubricant includes a miniature air pump 451 embedded and fixed to the top wall of the first deformation suppression block 411 and the second deformation suppression block 421. The first deformation suppression block 411 has lubrication holes 452 evenly distributed on the outer periphery of the first adsorption hole 412, and the second deformation suppression block 421 has lubrication holes 452 evenly distributed on the outer periphery of the second adsorption hole 422. Multiple sets of lubrication holes 452 are evenly distributed on the outer periphery of the first adsorption hole 412 and the second adsorption hole 422, and the lubrication holes 452 are connected to the air outlet of the miniature air pump 451. The small amount of positive pressure airflow output by the miniature air pump 451 is discharged through the lubrication holes 452, forming a uniform air film between the first deformation suppression block 411 and the crossbeam 12 and between the second deformation suppression block 421 and the bottom frame 13.

[0063] This air film can reduce sliding friction resistance, ensure smooth sliding of the deformation suppression block, and at the same time play an auxiliary air sealing role, reduce negative pressure loss, solve the problems of motion jamming and unstable negative pressure in existing sliding adsorption structures, and maintain the stability of deformation suppression effect.

[0064] The thickness of the crossbeam 12 and the bottom frame 13 are different. The thickness referred to here is the cavity thickness of the crossbeam 12 or the bottom frame 13. When the cavity thickness is inconsistent, the amount of welding deformation is also different. If a uniform negative pressure adsorption force is used, there will be problems such as insufficient constraint on thin cavity parts and excessive constraint on thick cavity parts. Therefore, in order to solve this problem, an adjustment component 43 is also provided on the worktable to realize independent adjustment of the negative pressure intensity to adapt to the deformation suppression requirements of workpieces with different thicknesses. The adjustment component includes a first adjustment block 433 that is slidably set on the first mounting block 431 and a second adjustment block 434 that is slidably set on the second mounting block 432.

[0065] Both the first mounting block 431 and the second mounting block 432 have through holes. The first connecting pipe 461 passes through the through hole in the first mounting block 431, and the second connecting pipe 462 passes through the through hole in the second mounting block 432.

[0066] The first adjusting block 433 is slidably mounted in the adjusting groove of the first mounting block 431 along a direction perpendicular to the axis of the first connecting pipe 461. The adjusting groove is connected to the through hole. The cross-sectional area of ​​the through hole can be changed by sliding the first adjusting block 433, thereby adjusting the negative pressure on the side of the crossbeam 12. The second adjusting block 434 is slidably mounted in the adjusting groove of the second mounting block 432 along a direction perpendicular to the axis of the second connecting pipe 462. The adjusting groove is connected to the through hole. The cross-sectional area of ​​the through hole can be changed by sliding the second adjusting block 434, thereby adjusting the negative pressure on the side of the bottom frame 13.

[0067] To achieve the linkage control of negative pressure adjustment and clamping stroke, reduce manual debugging, and improve the automation level of the equipment, a first support 331 is rotatably installed on the welding workbench 6. The first support 331 rotates around an axis perpendicular to the surface of the welding workbench 6. The first clamping block 31 is rotatably assembled on the first support 331. The adjusting gear 47 is fixed at the rotating shaft of the first support 331. The adjusting gear 47 and the rotating shaft of the first support 331 remain fixed, that is, when the first support 331 rotates, the adjusting gear 47 does not rotate. The adjusting rack 48 is slidably installed on the first support 331 and meshes with the adjusting gear 47.

[0068] The first support 331 has a first compression cavity 492 inside, the first piston plate 49 is slidably disposed in the first compression cavity 492 and is fixedly connected to the adjusting rack 48; the first mounting block 431 has a second compression cavity 493, the first compression cavity 492 and the second compression cavity 493 are connected to each other through a connecting pipe, and the first adjusting block 433 is slidably disposed in the second compression cavity 493.

[0069] When the first pressing block 31 rotates to press against the crossbeam 12, it drives the first bracket 331 to rotate synchronously. The adjusting gear 47 rotates accordingly and engages with the adjusting rack 48 to slide, thereby driving the first piston plate 49 to move in the first compression cavity 492, changing the air pressure in the first compression cavity 492. This air pressure change is transmitted to the second compression cavity 493 through the connecting pipe, driving the first adjusting block 433 to slide, realizing the linkage adjustment of the negative pressure on the side of the crossbeam 12 and the pressing stroke.

[0070] The second pressing block 32 has a third compression cavity 494, and the second mounting block 432 has a fourth compression cavity 495. The third compression cavity 494 and the fourth compression cavity 495 are connected to each other through a connecting pipe. The second piston plate 491 is slidably disposed in the third compression cavity 494 and is linked with the second pressing block 32.

[0071] When the second pressing block 32 slides to press against the bottom frame 13, it drives the second piston plate 491 to move synchronously, changing the air pressure in the third compression cavity 494. This air pressure change is transmitted to the fourth compression cavity 495 through the connecting pipe, driving the second adjusting block 434 to slide, thereby realizing the linkage adjustment of the negative pressure on the bottom frame 13 side and the pressing stroke.

[0072] To ensure that the deformation suppression blocks always follow the welding trajectory and concentrate the adsorption constraint effect on the high-temperature cooling stage of the weld, thus ensuring the deformation suppression effect, the driving component 44 is used to drive the first and second deformation suppression blocks 421 to slide synchronously. It includes a fixed frame 441, a fixed screw 442 and a first power source 443.

[0073] The fixing frame 441 is fixed on the first abutting block 31 and the second abutting block 32 respectively. The fixing screw 442 is rotated and assembled on the fixing frame along the welding trajectory direction, and its axis is parallel to the welding trajectory. The first and second deformation suppression blocks 421 are both connected to the fixing screw 442 by threads.

[0074] The first power source 443 uses a servo motor, which is fixed to one end of the fixed frame. Its output shaft is coaxially connected to the fixed lead screw 442, which can drive the fixed lead screw 442 to rotate smoothly. Through the threaded transmission, the deformation suppression block slides along the axis of the fixed lead screw 442, so that the constraint area of ​​the deformation suppression block is always synchronized with the welding trajectory.

[0075] To achieve precise tracking between the deformation suppression block and the welding head, and to avoid problems such as lag or advance caused by manual intervention, an infrared sensor 7 and a controller 8 are fixed on the welding worktable 6. The infrared sensor 7 is fixed to one side of the welding robot and can detect the movement trajectory of the welding head in real time and collect position signals, which are then transmitted to the controller 8 in real time.

[0076] The controller 8 is electrically connected to the first power source 443. It can precisely control the operating state of the first power source 443 according to the position signal of the welding head, thereby driving the fixed screw 442 to rotate. This ensures that the first deformation suppression block 411 and the second deformation suppression block 421 are always on the welded side of the welding head, concentrating the adsorption and constraint effect on the cooling stage when the weld temperature is the highest and the deformation risk is the greatest, further improving the deformation suppression effect and ensuring the consistency of welding quality.

[0077] The implementation principle of the laser welding equipment for a roll-formed beam battery pack frame in this application embodiment is as follows: When performing welding work, the crossbeam 12 and the bottom frame 13 are first accurately placed on the welding worktable 6. The first power component and the second power component 34 of the bonding component 3 are started. The first power component drives the first abutting block 31, which is rotated and installed on the mounting base of the welding worktable 6, to rotate and abut against the side wall of the crossbeam 12. The second power component 34 drives the second abutting block 32, which is slidably installed on the guide rail of the welding worktable 6, to slide and abut against the side of the bottom frame 13 away from the crossbeam 12, so that the crossbeam 12 and the bottom frame 13 are stably bonded.

[0078] Then, the negative pressure air pump 46 is activated. The negative pressure air pump 46 provides stable negative pressure through the first connecting pipe 461 and the second connecting pipe 462 to the first adsorption hole 412 of the first deformation suppression block 411 and the second adsorption hole 422 of the second deformation suppression block 421, respectively, forming a continuous adsorption constraint on the crossbeam 12 and the bottom frame 13. The laser welding robot 2 is then activated to perform welding operations. The base 1 rotates around an axis perpendicular to the ground, and the rotary table 5 drives the welding worktable 6 to rotate around a horizontal axis. The two work together to achieve multi-directional, multi-angle welding.

[0079] Simultaneously, the drive component 44 is activated, causing the first deformation suppression block 411 and the second deformation suppression block 421 to slide along the grooves of the first abutment block 31 and the second abutment block 32, respectively, moving synchronously with the welding trajectory. The micro air pump 451 of the lubrication component 45 works synchronously, outputting a small amount of positive pressure airflow through the lubrication hole 452 to form an air film between the deformation suppression block and the workpiece, ensuring smooth sliding and reducing negative pressure loss. The adjustment component 43, through the first adjustment block 433 and the second adjustment block 434, independently adjusts the negative pressure on the corresponding side according to the thickness of the crossbeam 12 and the bottom frame 13 and the abutment stroke, respectively, to adapt to the deformation suppression requirements of different workpieces, and finally completes the welding operation, effectively reducing the thermal deformation of the workpiece and ensuring the welding accuracy and quality stability.

[0080] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A laser welding equipment for a roll-formed beam battery pack frame, characterized in that: The system includes a base (1), a laser welding robot (2) located on one side of the frame, a welding worktable (6) located on the base (1), and a rotary table (5) located on the base (1) for rotating the welding worktable (6). The welding worktable (6) is also provided with a bonding component (3) for stably bonding and pressing the bottom frame (13) and the crossbeam (12), and a suppression component (4) for suppressing the deformation of the welding side of the crossbeam (12). The base (1) is rotated and set on the ground as a whole, and the rotation axis of the base (1) is perpendicular to the rotation axis of the welding worktable (6). The bonding component (3) includes a first abutting block (31) disposed on the welding workbench (6) and a second abutting block (32) disposed on the welding workbench (6). The second abutting block (32) is movably bonded to the side of the bottom frame (13) away from the crossbeam (12), and the first abutting block (31) is movably bonded to the side wall of the crossbeam (12). The welding workbench (6) is also provided with a first power member for rotating the first abutting block (31) and a second power member (34) for sliding the second abutting block (32). The suppression component (4) includes a beam deformation suppression component (41) corresponding to the first abutment block (31), a bottom frame deformation suppression component (42) corresponding to the second abutment block (32), and an adjustment component (43) for uniformly adjusting the degree of deformation suppression of the beam (12) and the degree of deformation suppression of the bottom frame (13). The beam deformation suppression component (41) includes a first deformation suppression block (411) that is relatively slidably disposed on the first abutment block (31). The first deformation suppression block (411) is in contact with the side wall of the beam (12), and a first adsorption hole (412) is provided on the first deformation suppression block (411). The welding workbench (6) is also provided with a negative pressure component that generates negative pressure in the first adsorption hole (412). The bottom frame deformation suppression component (42) includes a second deformation suppression block (421) that is slidably disposed on the second abutment block (32). The second deformation suppression block (421) has a second adsorption hole (422). The negative pressure component generates negative pressure towards the second adsorption hole (422). The adjusting component (43) is used to adjust the negative pressure in the first adsorption hole (412) and the second adsorption hole (422). The welding workbench (6) is also provided with a driving component (44) for sliding the first deformation suppression block (411) and the second deformation suppression block (421).

2. The laser welding equipment for a roll-formed beam battery pack frame according to claim 1, characterized in that: The suppression component (4) further includes a lubricant (45), which includes a positive pressure component disposed on the first deformation suppression block (411) / second deformation suppression block (421). The first deformation suppression block (411) is provided with fine lubrication holes (452) on the outer periphery of the first adsorption hole (412), and the second deformation suppression block (421) is provided with fine lubrication holes (452) on the outer periphery of the second adsorption hole (422). The lubrication holes (452) are evenly spaced.

3. The laser welding equipment for a roll-formed beam battery pack frame according to claim 2, characterized in that: The negative pressure component includes a negative pressure air pump (46) mounted on the welding workbench (6). The welding workbench (6) is provided with a first connecting pipe (461) for connecting the negative pressure air pump (46) to the first adsorption hole (412) and a second connecting pipe (462) for connecting the negative pressure air pump (46) to the second adsorption hole (422). The adjusting component (43) includes a first mounting block (431) mounted on the first deformation suppression block (411) and a second mounting block (432) mounted on the second deformation suppression block (421). The first connecting pipe (461) is provided with a first mounting block (431) mounted on the first deformation suppression block (411) and a second mounting block (432) mounted on the second deformation suppression block (421). The second connecting pipe (462) is disposed on the first mounting block (431). A first adjusting block (433) is slidably disposed on the first mounting block (431), and a second adjusting block (434) is slidably disposed on the second mounting block (432). The first adjusting block (433) adjusts the size of the channel through which the first connecting pipe (461) passes in the first mounting block (431), and the second adjusting block (434) adjusts the size of the channel through which the second connecting pipe (462) passes in the second mounting block (432).

4. The laser welding equipment for a roll-formed beam battery pack frame according to claim 3, characterized in that: A first support (311) is rotatably mounted on the welding workbench (6). A first abutting block (31) is rotatably mounted on the first support (311). An adjusting gear (47) is provided at the pivot of the first support (311). A first compression cavity (492) is provided inside the first support (311). An adjusting rack (48) is slidably mounted on the first support (311). The adjusting rack (48) meshes with the adjusting gear (47). A first piston plate is provided inside the first compression cavity (492). (49) The adjusting rack (48) is connected to the first piston plate (49). The first mounting block (431) is also provided with a second compression cavity (493). The first compression cavity (492) and the second compression cavity (493) are interconnected. The first adjusting block (433) is located in the second compression cavity (493). The first piston plate (49) is in contact with the inner peripheral wall of the first compression cavity (492). The adjusting block is in contact with the inner peripheral wall of the second compression cavity (493).

5. The laser welding equipment for a roll-formed beam battery pack frame according to claim 4, characterized in that: The second pressing block (32) is provided with a third compression cavity (494), and the second mounting block (432) is provided with a fourth compression cavity (495). A second piston plate (491) is slidably disposed in the third compression cavity (494), and the third compression cavity (494) is connected to the fourth compression cavity (495). The second piston plate (491) is in contact with the inner peripheral wall of the third compression cavity (494), and the second adjusting block (434) is in contact with the inner peripheral wall of the fourth compression cavity (495).

6. The laser welding equipment for a roll-formed beam battery pack frame according to claim 5, characterized in that: The driving component (44) includes a fixing frame (441) disposed on the first abutting block (31) / the second abutting block (32), a fixing screw (442) is rotatably disposed on the fixing frame (441), the first deformation suppression block (411) / the second deformation suppression block (421) are both threaded onto the fixing screw (442), and the fixing frame (441) is also provided with a first power source (443) for rotating the fixing screw (442).

7. The laser welding equipment for a roll-formed beam battery pack frame according to claim 6, characterized in that: The welding workbench (6) is equipped with an infrared sensor (7) and a controller (8). The controller (8) and the infrared sensor (7) are electrically connected to the first power source (443). When the welding robot moves to the welding area to weld the connection between the bottom frame (13) and the crossbeam (12), the infrared sensor (7) measures the movement trajectory of the welding head and transmits the signal to the controller (8). The controller (8) controls the first power source (443) to move, so that the first deformation suppression block (411) and the second deformation suppression block (421) are always located on the welded side of the welding head.

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