A laser welding device for copper busbars in energy storage cabinets and its welding process.

Abstract

The present invention is applicable to the technical field of copper busbar laser welding, and provides a copper busbar laser welding device for an energy storage cabinet and a welding process thereof, comprising a shaping unit and a straightening unit; the shaping unit comprises a support frame, a drive motor, a worm, a worm gear, a support plate, a shaping plate, and auxiliary parts; the straightening unit comprises a vertical plate, a fixed motor, a fixed roller, a fixed gear, a gear column, an adjusting part, and an adjusting gear; the shaping unit is used to shape the "J"-shaped bend of the copper busbar, so that two support plates and the shaping plate squeeze and shape the side walls on both sides of the raised part of the "J"-shaped bend of the copper busbar; thereby ensuring the dimensional accuracy and overall structural stability of the copper busbar, and further improving the welding quality of the copper busbar and the battery pole.

Description

Technical Field

[0001] This invention relates to the field of copper busbar laser welding technology, and more specifically, to a copper busbar laser welding device and welding process for energy storage cabinets. Background Technology

[0002] Laser welding of copper busbars and battery terminals in energy storage cabinets is a high-precision and high-efficiency metal connection process, mainly used in the manufacturing of power batteries (such as lithium batteries). It reliably welds conductive copper busbars to battery terminals (usually made of aluminum or copper) using laser energy.

[0003] In existing technologies, copper busbars are usually rectangular with a flat surface, and reliable welding can be achieved. However, in order to meet production needs, some energy storage cabinet devices require the copper busbars to be set in a "U" shape to change the current path.

[0004] However, during the welding of the "U"-shaped copper busbar, the welding sequence must be considered. After welding one end, the other end is welded. When welding the first end, the local high temperature (600~1000℃) causes the copper busbar to expand, and the "U"-shaped bend deforms due to insufficient rigidity. When welding the second end, the thermal stress on both sides is unbalanced, causing the bending angle to change again. This repeated deformation and angle change will eventually seriously affect the dimensional accuracy and overall structural stability of the copper busbar, leading to a decline in welding quality. It may even make it unable to meet the subsequent installation and use requirements, posing potential hazards to the performance and safety of the entire electrical equipment.

[0005] Meanwhile, after welding the first end of the "U"-shaped copper busbar, this end is fixed in the welding position. Due to the characteristics of the copper busbar material, during the welding process, the "U"-shaped bend will experience springback due to the release of thermal stress. This springback force is transmitted through the rigidity of the copper busbar itself, forming a tensile force acting on the already welded first end. Since the direction of this tensile force is perpendicular to the welding surface, it will generate a vertical peeling force on the welded end. This peeling force will cause a great stress concentration in the weld, making the welded end prone to cracking after being stressed. This will not only affect the welding quality of the copper busbar, but also have an extremely adverse impact on the performance, safety, and reliability of the entire electrical equipment. It must be given high priority and avoided in the welding process design and operation.

[0006] To address these issues, a laser welding device and welding process for copper busbars in energy storage cabinets are proposed to improve existing problems. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a laser welding device for copper busbars and its welding process for energy storage cabinets.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a laser welding device for copper busbars in an energy storage cabinet, comprising a welding unit, a shaping unit disposed above the welding unit, and straightening units evenly disposed around the shaping unit; the shaping unit comprises a support frame, a drive motor disposed within the support frame, a worm gear disposed at the output end of the drive motor, worm wheels evenly disposed around the worm gear, a support plate disposed on one side of the worm wheel, a shaping plate disposed at one end of the support plate, and auxiliary components symmetrically disposed on both sides of the support frame in the axial direction; the straightening unit comprises a vertical plate, a fixed motor disposed on one side of the vertical plate, a fixed roller sleeved on the output end of the fixed motor, a fixed gear disposed at the end of the fixed roller away from the fixed motor, a gear post meshing with the fixed gear, an adjusting component disposed at one end of the vertical plate, and an adjusting gear disposed at one end of the adjusting component; the adjusting gear is capable of meshing with the gear post.

[0009] The invention is further configured such that: the welding unit includes a welding machine tool, a Y-axis electric linear guide symmetrically arranged on the top of the welding machine tool in the radial direction, an X-axis electric linear guide arranged between the Y-axis electric linear guides, a vertical electric linear guide arranged on one side of the X-axis electric linear guide, a laser welding gun arranged at the displacement end of the vertical electric linear guide, and a pressing plate arranged below the laser welding gun; the pressing plate is L-shaped, and a positioning hole is opened at the bottom of the pressing plate in the horizontal direction.

[0010] The present invention is further configured such that: a track is provided between the Y-axis electric linear guides, an electric slide is slidably arranged on the track, a main board is provided below the electric slide, and an offset component is provided at the bottom of the main board.

[0011] The present invention is further configured such that: the offset component includes a first motor, a first shaft rotatably connected to the output end of the first motor, an offset plate rotatably connected to the end of the first shaft away from the first motor, a second motor disposed on one side of the first motor, a second shaft rotatably connected to the output end of the second motor, and a third shaft disposed on one side of the second shaft; the first motor and the first shaft are perpendicularly distributed, the second motor and the second shaft are perpendicularly distributed, the end of the second shaft away from the second motor is rotatably connected to the top of the offset plate, one end of the third shaft is rotatably connected to the top of the offset plate, and the other end is rotatably connected to the bottom of the main board.

[0012] The invention is further configured such that: the output end of the drive motor passes through the bottom of the support frame and is connected to the worm gear; the worm gear can mesh with the worm wheel for transmission; the two sides of the worm wheel are rotatably connected to the corresponding side wall of the bottom of the support frame; one end of the support plate is U-shaped, and the other end is vertically bent; the worm wheel is located inside the U-shaped end of the corresponding support plate; the two sides of the worm wheel can pass through the corresponding inner wall of the U-shaped end of the support plate and are rotatably connected to the corresponding side wall of the bottom of the support frame; the worm wheel and the support plate are relatively stationary.

[0013] The present invention is further configured such that: the auxiliary component includes a telescopic cylinder and an auxiliary plate disposed at the telescopic end of the telescopic cylinder; the telescopic end of the telescopic cylinder passes through the side wall of the corresponding support plate and is connected to the auxiliary plate.

[0014] The present invention is further configured such that: a slide rail is symmetrically arranged in the radial direction at the bottom of the main board, an electric slider is slidably arranged on the slide rail, a connecting frame is arranged between the electric sliders, a pneumatic gripper is arranged at the bottom of the connecting frame, clamping plates are arranged at both ends of the pneumatic gripper, a lifting cylinder is arranged on the side wall of the clamping plate, and the telescopic end of the lifting cylinder is connected to the side wall of the corresponding upright plate.

[0015] The invention is further configured such that: a notch is provided on one side of the upright plate; the output end of the fixed motor passes through the side wall of the upright plate and is connected to the fixed roller; a rotating shaft is also provided on the side of the fixed gear away from the fixed roller; the two ends of the rotating shaft are rotatably connected to the side wall of the upright plate; and the gear column is sleeved on the rotating shaft.

[0016] The present invention is further configured such that: the adjusting component includes an adjusting motor, an adjusting shaft disposed at the output end of the adjusting motor, an adjusting frame disposed on the adjusting shaft, and an adjusting roller rotatably connected to the adjusting frame; the output end of the adjusting motor passes through the side wall of the upright plate and is connected to the adjusting shaft, one end of the adjusting roller passes through the side wall of the adjusting frame and is connected to the adjusting gear, and a displacement groove is also provided on the side wall of the upright plate, and the side wall of the adjusting frame can slide within the displacement groove.

[0017] A laser welding process for copper busbars in energy storage cabinets, using the laser welding apparatus for copper busbars in energy storage cabinets as described above, includes the following steps:

[0018] S1. First, place the copper busbar between the corresponding batteries, so that one end of the copper busbar is on the positive terminal of one battery and the other end is on the negative terminal of another battery. Then, start the welding unit to perform ring laser welding on both ends of the copper busbar in sequence.

[0019] S2. During the operation of S1, the driving motor starts, driving the worm to rotate, causing the four worm wheels to rotate simultaneously, thereby driving the corresponding support plates to rotate synchronously, and then driving the corresponding shaping plates to closely fit the four sides around the "ji" - shaped bending part of the copper bar; furthermore, two of the support plates and shaping plates squeeze and shape the side walls on both sides of the protruding part of the "ji" - shaped bending part of the copper bar, and the other two support plates and shaping plates limit and fix the other two side walls of the "ji" - shaped bending part of the copper bar.

[0020] S3. Insert the position of the copper bar that does not翘 up upwards between the fixed roller and the adjusting part, so that the outer wall of the fixed roller fits against the bottom of the copper bar. Since the copper bar翘 up upwards, the bottom of the copper bar is at the original horizontal position.

[0021] S4. Subsequently, the fixed motor starts, driving the fixed roller to rotate, and driving the adjusting part to rotate simultaneously through the fixed gear, tooth column and adjusting gear, so that the fixed roller and the adjusting part simultaneously roll - press and straighten the bottom and top of the copper bar.

[0022] S5. During the operation of S4, the adjusting part also starts, so that during the roll - press straightening process, the adjusting part gradually slides closer to the fixed roller and squeezes the copper bar to tightly fit against the fixed roller, making the copper bar gradually straighten to the original levelness.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] (1) The function of the shaping unit is to shape the "ji" - shaped bending part of the copper bar, so that two of the support plates and shaping plates squeeze and shape the side walls on both sides of the protruding part of the "ji" - shaped bending part of the copper bar; it avoids the problem that when welding the first end, local high temperature causes the copper bar to expand, and the "ji" - shaped bending part deforms due to insufficient rigidity; when welding the second end, the thermal stress on both sides is unbalanced, resulting in the bending angle changing again; thus ensuring the dimensional accuracy and overall structural stability of the copper bar, and further improving the welding quality between the copper bar and the battery pole column.

[0025] (2) The function of the straightening unit is to straighten and repair the copper bar with the welded end翘 up, so that the fixed roller and the adjusting part simultaneously roll - press and straighten the bottom and top of the copper bar; it avoids the phenomenon that the "ji" - shaped bending part rebounds due to the release of thermal stress; this resilience force is transmitted through the rigidity of the copper bar itself, forming a tensile force acting on the already welded first end; since the direction of this tensile force is perpendicular to the welding surface, a vertical peeling force is generated on the already welded end; this peeling force causes great stress concentration on the weld seam, making the weld seam of the already welded end prone to cracking when stressed; further improving the welding quality of the copper bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] It should be noted that there is an unclear expression "翘 up" in the original text. You may need to check and correct it according to the actual situation.Figure 1 This is a schematic diagram of the overall structure of the copper busbar laser welding device for energy storage cabinets according to the present invention.

[0027] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0028] Figure 3 This is a schematic diagram of the overall structure of the track, electric slide, and mainboard in this invention.

[0029] Figure 4 This is a schematic diagram of the overall structure of the offset component in this invention.

[0030] Figure 5 This is a schematic diagram of the cooperation structure between the shaping unit and the copper busbar in this invention.

[0031] Figure 6 This is a schematic diagram of the annular laser welding structure of the copper busbar in this invention.

[0032] Figure 7 This is a schematic diagram of the overall structure of the motherboard and pneumatic grippers in this invention.

[0033] Figure 8 This is a schematic diagram of the overall structure of the straightening unit in this invention.

[0034] Figure 9 This is a schematic diagram of the overall structure of the upright plate and the cutout in this invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Welding unit; 11. Welding machine tool; 12. Y-axis electric linear guide; 13. X-axis electric linear guide; 14. Vertical electric linear guide; 15. Laser welding gun; 16. Pressing plate; 161. Positioning hole; 17. Track; 171. Electric slide table; 18. Main board; 181. Slide rail; 182. Electric slider; 183. Connecting frame; 184. Pneumatic gripper; 185. Clamping plate; 186. Lifting cylinder; 19. Offset component; 191. First motor; 192. First rotating shaft; 193. Offset plate; 194. Second motor; 195. Second rotating shaft; 196. Third rotating shaft;

[0036] 2. Shaping unit; 21. Support frame; 22. Drive motor; 23. Worm gear; 24. Worm wheel; 25. Support plate; 26. Shaping plate; 27. Auxiliary parts; 271. Telescopic cylinder; 272. Auxiliary plate;

[0037] 3. Straightening unit; 31. Vertical plate; 311. Cut; 312. Displacement groove; 32. Fixed motor; 33. Fixed roller; 34. Fixed gear; 35. Gear column; 36. Adjusting component; 361. Adjusting motor; 362. Adjusting shaft; 363. Adjusting frame; 364. Adjusting roller; 37. Adjusting gear; 38. Rotating shaft. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0039] See also Figures 1-9 The present invention provides the following technical solutions:

[0040] Example 1, see Figures 1-9 A laser welding device for copper busbars in an energy storage cabinet includes a welding unit 1, a shaping unit 2 above the welding unit 1, and straightening units 3 evenly arranged around the shaping unit 2.

[0041] The shaping unit 2 is used to shape the "U"-shaped bend of the copper busbar. The two support plates 25 and the shaping plate 26 compress and shape the side walls of the protrusion at the "U"-shaped bend of the copper busbar. This avoids the problem that the copper busbar expands due to local high temperature (600~1000℃) when welding the first end, and the "U"-shaped bend deforms due to insufficient rigidity. It also avoids the problem that the thermal stress on both sides is unbalanced when welding the second end, causing the bending angle to change again. This ensures the dimensional accuracy and overall structural stability of the copper busbar, thereby improving the welding quality between the copper busbar and the battery terminal.

[0042] The straightening unit 3 is used to straighten and repair the copper busbars with raised welded ends. It allows the fixed rollers 33 and the adjusting components 36 to simultaneously roll and straighten the bottom and top of the copper busbars. This prevents the springback phenomenon that would occur at the "U"-shaped bend due to the release of thermal stress. This springback force is transmitted through the rigidity of the copper busbar itself, forming a tensile force acting on the first welded end. Since the direction of this tensile force is perpendicular to the welding surface, it will generate a vertical peeling force on the welded end. This peeling force will cause great stress concentration in the weld, making the welded end prone to cracking after being stressed. This further improves the welding quality of the copper busbars.

[0043] See Figures 1-2 Specifically, the welding unit 1 includes a welding machine tool 11, a Y-axis electric linear guide 12 symmetrically arranged on the top of the welding machine tool 11 in the radial N direction, an X-axis electric linear guide 13 arranged between the Y-axis electric linear guides 12, a vertical electric linear guide 14 arranged on one side of the X-axis electric linear guide 13, a laser welding gun 15 arranged at the displacement end of the vertical electric linear guide 14, and a pressing plate 16 arranged below the laser welding gun 15; the pressing plate 16 is L-shaped, and a positioning hole 161 is opened at the bottom of the pressing plate 16 in the horizontal direction.

[0044] Among them, it is started by the Y-axis electric linear guide rail 12, the X-axis electric linear guide rail 13 and the vertical electric linear guide rail 14, which can drive the laser welding gun 15 to weld the copper bar at any position; during welding, the vertical electric linear guide rail 14 drives the pressing plate 16 to displace downward, so that the pressing plate 16 presses one end of the copper bar to be welded, and at the same time the welding area is exposed in the positioning hole 161, and finally circular laser welding is carried out through the laser welding gun 15.

[0045] Refer to Figures 3-6 , specifically, the shaping unit 2 includes a support frame 21, a driving motor 22 arranged in the support frame 21, a worm 23 arranged at the output end of the driving motor 22, worm wheels 24 uniformly arranged around the worm 23, a support plate 25 arranged on one side of the worm wheel 24, a shaping plate 26 arranged at one end of the support plate 25, and auxiliary members 27 symmetrically arranged on both sides of the support frame 21 in the axial M direction.

[0046] Among them, first place the copper bar between the corresponding batteries, so that one end of the copper bar is located on the positive electrode post of one battery, and the other end of the copper bar is located on the negative electrode post of the other battery. Subsequently, start the welding unit 1, so that the welding unit 1 sequentially performs circular laser welding on both ends of the copper bar.

[0047] During the working process of the welding unit 1, the driving motor 22 is started to drive the worm 23 to rotate, so that the four worm wheels 24 rotate simultaneously. Since both sides of the worm wheel can penetrate the corresponding inner walls of the U-shaped ends of the support plate and are rotatably connected to the corresponding side walls at the bottom of the support frame, and the worm wheel and the support plate are relatively stationary, the corresponding support plate 25 is driven to rotate synchronously. Since one end of the support plate 25 is U-shaped and the other end is vertically bent, and the vertically bent end is connected to the shaping plate 26, the shaping plate 26 and the support plate 25 are also vertically distributed. According to the attached Figure 5 and Figure 6 it can be seen that the support plate 25 will drive the corresponding shaping plate 26 to tightly fit the periphery of the "Ji" character bending part of the copper bar at the same time; thus, two of the support plates 25 and the shaping plate 26 squeeze and shape the side walls of the protruding part of the "Ji" character bending part of the copper bar, avoiding the problem that when welding the first end, local high temperature (600 - 1000 °C) causes the copper bar to expand and the "Ji" character bending part deforms due to insufficient rigidity; when welding the second end, the thermal stress on both sides is unbalanced, resulting in the bending angle changing again; thereby ensuring the dimensional accuracy and overall structural stability of the copper bar, and further improving the welding quality between the copper bar and the battery electrode post.

[0048] Meanwhile, since the lateral tension generated by the elastic rebound of the copper busbar is a complex stress release in multiple dimensions, there is not only vertical peeling force, but also torsional stress. Therefore, the other two support plates 25 and shaping plates 26 can also limit and fix the other two side walls of the "U" bend of the copper busbar, making it less prone to torsion problems, thereby ensuring the welding quality of the copper busbar and contributing to the overall structural stability of the copper busbar.

[0049] See Figures 7-9 Specifically, the straightening unit 3 includes a vertical plate 31, a fixed motor 32 disposed on one side of the vertical plate 31, a fixed roller 33 sleeved on the output end of the fixed motor 32, a fixed gear 34 disposed on the end of the fixed roller 33 away from the fixed motor 32, a gear 35 meshing with the fixed gear 34 for transmission, an adjusting member 36 disposed on one end of the vertical plate 31, and an adjusting gear 37 disposed on one end of the adjusting member 36; the adjusting gear 37 can mesh with the gear 35 for transmission.

[0050] In the process of welding the first end of the "U"-shaped copper busbar, the end is fixed in the welding position. Due to the characteristics of the copper busbar material, during the welding process, the bent part will spring back due to the release of thermal stress. This springback force will be transmitted through the rigidity of the copper busbar itself, forming a tensile force acting on the first end that has been welded. Since the direction of this tensile force is perpendicular to the welding surface, it will generate a vertical peeling force on the first end of the copper busbar, that is, the welded end. This peeling force will cause great stress concentration in the weld, making the welded end prone to cracking after being stressed.

[0051] It should be noted that in this invention, after the soldered end is subjected to peeling force, the copper busbar at the soldered end will be deformed upward. At this time, there is still a transition section between the upward deformation of the copper busbar and the soldered end. The copper busbar in this transition section is horizontally distributed, that is, it is not upward.

[0052] Therefore, the part of the copper busbar that has been welded but has not been raised upwards (transition section) needs to be inserted between the fixed roller 33 and the adjusting part 36, so that the outer wall of the fixed roller 33 is in contact with the bottom of the copper busbar. Since the deformation part of the copper busbar is raised upwards, the tangential side wall of the fixed roller 33 in contact with the copper busbar is in the original horizontal position.

[0053] Subsequently, the fixed motor 32 starts, driving the fixed roller 33 to rotate. Through the fixed gear 34, gear column 35, and adjusting gear 37, the adjusting component 36 rotates simultaneously, so that the fixed roller 33 and the adjusting component 36 simultaneously roll and straighten the bottom and top of the copper busbar. During this process, the adjusting component 36 also starts, gradually sliding closer to the fixed roller 33 during the rolling and straightening process, and pressing the copper busbar against the fixed roller 33, so that the copper busbar gradually straightens to its original levelness. This avoids the springback phenomenon caused by the release of thermal stress at the "U" bend, and further improves the welding quality of the copper busbar.

[0054] See Figures 3-7 Furthermore, a track 17 is provided between the Y-axis electric linear guides 12, an electric slide table 171 is slidably mounted on the track 17, a main board 18 is provided below the electric slide table 171, and an offset component 19 is provided at the bottom of the main board 18.

[0055] When the electric slide table 171 is started, it can drive the main board 18 and the offset component 19 to slide on the track 17. At the same time, the shaping unit 2 connected to the offset component 19 also moves synchronously, thereby driving the shaping unit 2 to shape different copper busbars.

[0056] See Figures 3-7 Furthermore, the offset component 19 includes a first motor 191, a first shaft 192 rotatably connected to the output end of the first motor 191, an offset plate 193 rotatably connected to the end of the first shaft 192 away from the first motor 191, a second motor 194 disposed on one side of the first motor 191, a second shaft 195 rotatably connected to the output end of the second motor 194, and a third shaft 196 disposed on one side of the second shaft 195; the first motor 191 and the first shaft 192 are perpendicularly distributed, the second motor 194 and the second shaft 195 are perpendicularly distributed, the end of the second shaft 195 away from the second motor 194 is rotatably connected to the top of the offset plate 193, one end of the third shaft 196 is rotatably connected to the top of the offset plate 193, and the other end is rotatably connected to the bottom of the main board 18.

[0057] Among them, the first motor 191 starts, driving the first rotating shaft 192 to rotate, so that the first rotating shaft 192 rotates around one end of the first rotating shaft 192 close to the first motor 191; the second motor 194 starts, driving the second rotating shaft 195 to rotate around one end of the second rotating shaft 195 close to the second motor 194; when it is necessary to displace the offset plate 193 in one direction, the first motor 191 can be made to drive the first rotating shaft 192 to rotate in the corresponding direction. At this time, the second motor 194 stops. Since the connection between the second motor 194 and the second rotating shaft 195 is hinged, the second rotating shaft 195 can rotate and offset along with the first rotating shaft 192; when the second motor 194 starts, the second motor 194 can be made to drive the second rotating shaft 195 to rotate in the other corresponding direction. At this time, the first motor 191 stops. Since the connection between the first motor 191 and the first rotating shaft 192 is hinged, the first rotating shaft 192 can rotate and offset along with the second rotating shaft 195; during this process, the third rotating shaft 196 will also tilt and offset as the first rotating shaft 192 and the second rotating shaft 195 rotate, so that the first rotating shaft 192, the second rotating shaft 195 and the third rotating shaft 196 can rotate and offset in any one direction at the same time, so that the offset plate 193 is displaced synchronously.

[0058] Therefore, when the shaping unit 2 closely fits the periphery of the "Ji" - shaped bending part of the copper bar, due to the characteristics of the copper bar material, during the welding process, the bending part will produce a spring - back phenomenon due to the release of thermal stress; this spring - back force will be transmitted through the rigidity of the copper bar itself, forming a tensile force acting on the already welded first end; since the direction of this tensile force is perpendicular to the welding surface, it will generate a vertical peeling force on the first end of the copper bar, that is, the welded end. After the welded end generates a peeling force, it will cause the copper bar at the welded end to deform upward and tilt. At this time, through the above - mentioned first rotating shaft 192, the second rotating shaft 195 and the third rotating shaft 196 can rotate and offset in any one direction at the same time, so that the offset plate 193 is displaced synchronously, and further, the shaping unit 2 can continue to closely fit the periphery of the "Ji" - shaped bending part of the copper bar after the copper bar deforms upward and tilts.

[0059] Refer to Figures 3-7 , further, the output end of the driving motor 22 penetrates through the bottom of the support frame 21 and is connected to the worm 23. The worm 23 can be meshed and driven with the worm wheel 24. Both sides of the worm wheel 24 are rotationally connected to the corresponding side walls at the bottom of the support frame 21; one end of the support plate 25 is U - shaped, and the other end is vertically bent and distributed. The worm wheel 24 is located inside the U - shaped end of the corresponding support plate 25. Both sides of the worm wheel 24 can penetrate through the corresponding inner walls of the U - shaped end of the support plate 25 and are rotationally connected to the corresponding side walls at the bottom of the support frame 21. The worm wheel 24 and the support plate 25 are relatively stationary.

[0060] Refer to Figures 3-7 Furthermore, the auxiliary component 27 includes a telescopic cylinder 271 and an auxiliary plate 272 disposed at the telescopic end of the telescopic cylinder 271; the telescopic end of the telescopic cylinder 271 passes through the side wall of the corresponding support plate 25 and is connected to the auxiliary plate 272.

[0061] When the two support plates 25 and the shaping plate 26 compress and shape the side walls of the protrusion at the "U" bend of the copper busbar, since one end of the support plate 25 is U-shaped and the other end is vertically bent, the vertical bend at the other end of the support plate 25 can be engaged with the top of the "U" bend, while the shaping plate 26 tightly fits the corresponding side wall. During this process, the telescopic cylinder 271 is activated, driving the auxiliary plate 272 to press down and compress and flatten the top of the "U" bend again. This avoids the problem of the copper busbar expanding due to local high temperature (600~1000℃) during the first welding, causing deformation of the "U" bend due to insufficient rigidity; and the problem of the bending angle changing again due to unbalanced thermal stress on both sides during the second welding. This ensures the dimensional accuracy and overall structural stability of the copper busbar, thereby improving the welding quality between the copper busbar and the battery terminal.

[0062] Example 2: While the technical solution of Example 1 solves the problems of localized high temperature (600~1000℃) causing copper busbar expansion during the welding of the first end, leading to deformation at the "U"-shaped bend due to insufficient rigidity, and the imbalance of thermal stress on both sides causing a change in the bending angle during the welding of the second end, it does not solve the problem of springback at the "U"-shaped bend due to the release of thermal stress. This springback force is transmitted through the rigidity of the copper busbar itself, forming a tensile force acting on the already welded first end. Since the direction of this tensile force is perpendicular to the welding surface, it will generate a vertical peeling force on the welded end. This peeling force will cause great stress concentration in the weld, making the welded end prone to cracking after being stressed. Therefore, the following solution is proposed:

[0063] See Figures 7-9 Furthermore, the bottom of the main board 18 is symmetrically provided with slide rails 181 in the radial N direction. Electric sliders 182 are slidably arranged on the slide rails 181. A connecting frame 183 is provided between the electric sliders 182. A pneumatic gripper 184 is provided at the bottom of the connecting frame 183. Clamping plates 185 are provided at both ends of the pneumatic gripper 184. A lifting cylinder 186 is provided on the side wall of the clamping plate 185. The telescopic end of the lifting cylinder 186 is connected to the side wall of the corresponding upright plate 31.

[0064] When the pneumatic gripper 184 is activated, it causes the clamping plates 185 at both ends to retract, so that the two sides of the copper busbar are respectively engaged into the corresponding straightening unit 3. Then, when the straightening unit 3 is activated, the electric slider 182 is activated, and the straightening unit 3 is slid through the connecting frame 183, so that the straightening unit 3 is repaired and straightened along the upward direction of the copper busbar.

[0065] The lifting cylinder 186 can be activated to lift the straightening unit 3. Once the electric slide table 171 starts sliding, it will not interfere with the movement.

[0066] See Figures 7-9 Furthermore, a notch 311 is provided on one side of the upright plate 31, and the output end of the fixed motor 32 passes through the side wall of the upright plate 31 and is connected to the fixed roller 33. A rotating shaft 38 is also provided on the side of the fixed gear 34 away from the fixed roller 33. The two ends of the rotating shaft 38 are rotatably connected to the side wall of the upright plate 31, and the toothed column 35 is sleeved on the rotating shaft 38.

[0067] See Figures 7-9 Furthermore, the adjusting component 36 includes an adjusting motor 361, an adjusting shaft 362 disposed at the output end of the adjusting motor 361, an adjusting frame 363 disposed on the adjusting shaft 362, and an adjusting roller 364 rotatably connected within the adjusting frame 363; the output end of the adjusting motor 361 passes through the side wall of the upright plate 31 and is connected to the adjusting shaft 362, one end of the adjusting roller 364 passes through the side wall of the adjusting frame 363 and is connected to the adjusting gear 37, and a displacement groove 312 is also provided on the side wall of the upright plate 31, and the side wall of the adjusting frame 363 can slide within the displacement groove 312.

[0068] In this process, the side of the welded transition section of the copper busbar enters the vertical plate 31 through the cut 311. Then, the fixed motor 32 starts, driving the fixed roller 33 to rotate. Through the fixed gear 34, gear column 35, adjusting gear 37 and rotating shaft 38, the adjusting roller 364 is driven to rotate simultaneously, so that the fixed roller 33 and the adjusting roller 364 simultaneously roll and straighten the bottom and top of the copper busbar. During this process, the adjusting motor 361 starts, driving the adjusting shaft 362 to rotate, so that the adjusting frame 363 slides linearly in the displacement groove 312. During the rolling and straightening process, the adjusting roller 364 gradually slides closer to the fixed roller 33 and squeezes the copper busbar to fit tightly against the fixed roller 33, so that the copper busbar gradually straightens to its original levelness. This avoids the springback phenomenon caused by the release of thermal stress at the "U" shaped bend, and further improves the welding quality of the copper busbar.

[0069] It should be noted that if the two ends of the copper bar are simultaneously subjected to laser circular welding, due to the particularity of the "ji" - shaped bend in the middle of the copper bar, deformation will still occur at the "ji" - shaped bend of the copper bar. At this time, it is still necessary to perform shaping treatment through the shaping unit 2 in the present invention; meanwhile, during the welding process, the same is true for the vertical peeling force generated at the welded end. When welding both ends simultaneously, peeling forces will be generated at both ends, and it is also necessary to repair and straighten through the straightening unit 3.

[0070] Embodiment 3, a laser welding process for copper bars used in energy storage cabinets, using the laser welding device for copper bars used in energy storage cabinets as described above, includes the following steps:

[0071] S1. First, place the copper bar between the corresponding batteries, such that one end of the copper bar is located on the positive electrode post of one battery, and the other end of the copper bar is located on the negative electrode post of another battery. Subsequently, start the welding unit 1, and make the welding unit 1 perform circular laser welding on both ends of the copper bar in sequence.

[0072] S2. During the operation of S1, start the driving motor 22, which drives the worm 23 to rotate, causing the four worm wheels 24 to rotate simultaneously, thereby driving the corresponding support plates 25 to rotate synchronously, and then driving the corresponding shaping plates 26 to closely fit the periphery of the "ji" - shaped bend of the copper bar at the same time; furthermore, make two of the support plates 25 and shaping plates 26 squeeze and shape the side walls on both sides of the convex part of the "ji" - shaped bend of the copper bar, and the other two support plates 25 and shaping plates 26 limit and fix the other two side walls of the "ji" - shaped bend of the copper bar.

[0073] S3. Insert the position of the copper bar that does not翘 up upwards between the fixed roller 33 and the adjusting member 36, such that the outer wall of the fixed roller 33 fits against the bottom of the copper bar. Since the copper bar翘s up upwards, the bottom of the copper bar is at the original horizontal position.

[0074] S4. Subsequently, start the fixed motor 32, which drives the fixed roller 33 to rotate, and drives the adjusting member 36 to rotate simultaneously through the fixed gear 34, the tooth column 35, and the adjusting gear 37, so that the fixed roller 33 and the adjusting member 36 simultaneously roll - press and straighten the bottom and top of the copper bar.

[0075] S5. During the operation of S4, the adjusting member 36 will also start, such that during the rolling - press straightening process, the adjusting member 36 gradually slides closer to the fixed roller 33 and squeezes the copper bar to tightly fit against the fixed roller 33, making the copper bar gradually straighten to the original level.

[0076] It should be noted that the "翘" in the original text seems to be an incorrect or incomplete character. I translated it as "翘 up upwards" for the purpose of maintaining the integrity of the translation while keeping the original text's problem in mind. You may need to check and correct this part according to the actual situation.Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. A laser welding device for copper busbars in an energy storage cabinet, characterized in that: include, A welding unit (1) is provided above the welding unit (1), and a straightening unit (3) is provided around the shaping unit (2). The shaping unit (2) includes a support frame (21), a drive motor (22) disposed in the support frame (21), a worm (23) disposed at the output end of the drive motor (22), a worm wheel (24) evenly disposed around the worm (23), a support plate (25) disposed on one side of the worm wheel (24), a shaping plate (26) disposed at one end of the support plate (25), and auxiliary parts (27) symmetrically disposed on both sides of the support frame (21) in the axial direction. The straightening unit (3) includes a vertical plate (31), a fixed motor (32) disposed on one side of the vertical plate (31), a fixed roller (33) sleeved on the output end of the fixed motor (32), a fixed gear (34) disposed on the end of the fixed roller (33) away from the fixed motor (32), a gear column (35) meshing with the fixed gear (34), an adjusting member (36) disposed on one end of the vertical plate (31), and an adjusting gear (37) disposed on one end of the adjusting member (36); the adjusting gear (37) can mesh with the gear column (35). The output end of the drive motor (22) passes through the bottom of the support frame (21) and is connected to the worm (23). The worm (23) can mesh with the worm wheel (24) for transmission. The two sides of the worm wheel (24) are rotatably connected to the corresponding side wall at the bottom of the support frame (21). One end of the support plate (25) is U-shaped and the other end is vertically bent. The worm wheel (24) is located inside the U-shaped end of the corresponding support plate (25). Both sides of the worm wheel (24) can penetrate the corresponding inner wall of the U-shaped end of the support plate (25) and are rotatably connected to the corresponding side wall at the bottom of the support frame (21). The worm wheel (24) and the support plate (25) are relatively stationary. The auxiliary component (27) includes a telescopic cylinder (271) and an auxiliary plate (272) disposed at the telescopic end of the telescopic cylinder (271); the telescopic end of the telescopic cylinder (271) passes through the side wall of the corresponding support plate (25) and is connected to the auxiliary plate (272). A notch (311) is provided on one side of the upright plate (31). The output end of the fixed motor (32) passes through the side wall of the upright plate (31) and is connected to the fixed roller (33). A rotating shaft (38) is also provided on the side of the fixed gear (34) away from the fixed roller (33). The two ends of the rotating shaft (38) are rotatably connected to the side wall of the upright plate (31). The toothed column (35) is sleeved on the rotating shaft (38). The adjusting component (36) includes an adjusting motor (361), an adjusting shaft (362) disposed at the output end of the adjusting motor (361), an adjusting frame (363) disposed on the adjusting shaft (362), and an adjusting roller (364) rotatably connected to the adjusting frame (363). The output end of the regulating motor (361) passes through the side wall of the upright plate (31) and is connected to the regulating shaft (362). One end of the regulating roller (364) passes through the side wall of the regulating frame (363) and is connected to the regulating gear (37). A displacement groove (312) is also provided on the side wall of the upright plate (31). The side wall of the regulating frame (363) can slide in the displacement groove (312).

2. The laser welding device for copper busbars in an energy storage cabinet according to claim 1, characterized in that: The welding unit (1) includes a welding machine tool (11), a Y-axis electric linear guide (12) symmetrically arranged on the top of the welding machine tool (11) in the radial direction, an X-axis electric linear guide (13) arranged between the Y-axis electric linear guides (12), a vertical electric linear guide (14) arranged on one side of the X-axis electric linear guide (13), a laser welding gun (15) arranged at the displacement end of the vertical electric linear guide (14), and a pressing plate (16) arranged below the laser welding gun (15). The pressing plate (16) is L-shaped, and a positioning hole (161) is provided at the bottom of the pressing plate (16) in the horizontal direction.

3. The laser welding device for copper busbars in an energy storage cabinet according to claim 2, characterized in that: A track (17) is also provided between the Y-axis electric linear guides (12), an electric slide (171) is slidably provided on the track (17), a main board (18) is provided below the electric slide (171), and an offset component (19) is provided at the bottom of the main board (18).

4. The laser welding device for copper busbars in an energy storage cabinet according to claim 3, characterized in that: The offset component (19) includes a first motor (191), a first rotating shaft (192) rotatably connected to the output end of the first motor (191), an offset plate (193) rotatably connected to the end of the first rotating shaft (192) away from the first motor (191), a second motor (194) disposed on one side of the first motor (191), a second rotating shaft (195) rotatably connected to the output end of the second motor (194), and a third rotating shaft (196) disposed on one side of the second rotating shaft (195). The first motor (191) is perpendicular to the first rotating shaft (192), the second motor (194) is perpendicular to the second rotating shaft (195), one end of the second rotating shaft (195) away from the second motor (194) is rotatably connected to the top of the offset plate (193), one end of the third rotating shaft (196) is rotatably connected to the top of the offset plate (193), and the other end is rotatably connected to the bottom of the main board (18).

5. The laser welding device for copper busbars in an energy storage cabinet according to claim 3, characterized in that: The bottom of the main board (18) is symmetrically provided with slide rails (181) in the radial direction. Electric sliders (182) are slidably provided on the slide rails (181). A connecting frame (183) is provided between the electric sliders (182). A pneumatic gripper (184) is provided at the bottom of the connecting frame (183). A clamping plate (185) is provided at both ends of the pneumatic gripper (184). A lifting cylinder (186) is provided on the side wall of the clamping plate (185). The telescopic end of the lifting cylinder (186) is connected to the side wall of the corresponding upright plate (31).

6. A laser welding process for copper busbars in energy storage cabinets, using the laser welding apparatus for copper busbars in energy storage cabinets as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. First, place the copper bar between the corresponding batteries, such that one end of the copper bar is located on the positive electrode post of one battery and the other end of the copper bar is located on the negative electrode post of the other battery. Subsequently, start the welding unit (1) so that the welding unit (1) performs circular laser welding on both ends of the copper bar in sequence; S2. During the operation of S1, start the drive motor (22) to drive the worm (23) to rotate, causing the four worm wheels (24) to rotate simultaneously, thereby driving the corresponding support plates (25) to rotate synchronously, and then driving the corresponding shaping plates (26) to closely fit the four sides around the "J" - shaped bend of the copper bar; furthermore, causing two of the support plates (25) and shaping plates (26) to squeeze and shape the side walls on both sides of the convex part of the "J" - shaped bend of the copper bar, and the other two support plates (25) and shaping plates (26) to limit and fix the other two side walls of the "J" - shaped bend of the copper bar; S3. Insert the position of the copper bar that does not翘 up into between the fixed roller (33) and the adjusting member (36), such that the outer wall of the fixed roller (33) is in contact with the bottom of the copper bar. Since the copper bar翘 up, the bottom of the copper bar is at the original horizontal position; S4. Subsequently, start the fixed motor (32) to drive the fixed roller (33) to rotate, and drive the adjusting roller (364) to rotate simultaneously through the fixed gear (34), the tooth column (35) and the adjusting gear (37), so that the fixed roller (33) and the adjusting roller (364) simultaneously roll - press and straighten the bottom and the top of the copper bar; S5. During the operation of S4, the adjusting member (36) will also start, such that during the roll - press straightening process, the adjusting member (36) gradually slides closer to the fixed roller (33) and squeezes the copper bar to press closely against the fixed roller (33), causing the copper bar to be gradually straightened to the original levelness. It should be noted that the Chinese character "翘" in the original text seems to be an incorrect or non - standard character. I translated it as "翘 up" according to the context, but it may need to be further confirmed in the actual situation.

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