Laser brazing repair device for electric vehicle battery pack shell damage

Abstract

The invention discloses a laser brazing repair device for electric vehicle battery pack shell damage, and relates to the technical field of battery shell laser repair, the laser brazing repair device comprises a welding assembly, a laser brazing assembly and a laser brazing assembly, the welding assembly comprises a welding machine and a welding gun, and the welding gun is connected with the welding machine through a wire; the positioning assembly is connected with the welding gun and comprises a positioning piece, the positioning piece comprises a positioning block, a clamping groove is formed in the positioning block, a rolling wheel is arranged in the clamping groove, a supporting plate is rotationally connected to the outer side of the rolling wheel, and a rotating column is rotationally connected to one side of the supporting plate. The laser welding device has the beneficial effects that by arranging the positioning assembly, the moving track of the laser gun head can be restrained, so that the laser gun head can only move along the track of a welding seam, the laser focus is always aligned with the center of the welding seam, the deviation is small, and the defects of insufficient welding, welding skips, base material burnthrough, shell deformation and the like are fundamentally avoided; it is ensured that the repaired battery pack shell meets the strength requirement, and potential safety hazards of water inflow and short circuit of the battery pack are eliminated.

Description

Technical Field

[0001] This invention relates to the field of laser repair technology for battery casings, and in particular to a laser brazing repair device for damaged battery pack casings in electric vehicles. Background Technology

[0002] In the field of electric vehicle battery pack maintenance, the battery pack shell, as a core protective component, is mostly made of lightweight metal materials such as aluminum alloy. When the shell is damaged by cracks, dents, perforations, etc., laser brazing technology has become the mainstream repair method due to its advantages of small heat input, small welding deformation, and effective avoidance of damage to internal modules. In actual repair operations, the shape of the damaged weld seam of the battery pack shell is complex and varied, mostly irregular curves. At present, the industry generally adopts the repair method of operators holding a laser gun and moving along the weld seam. Although this method has the characteristics of flexible operation and adaptability to complex on-site spaces, it has technical defects that are difficult to overcome.

[0003] When operating by hand, the operator's arm exerts uneven force and the hand is prone to slight tremors. It is also impossible to accurately perceive the trajectory changes of irregular weld seams, making it difficult for the laser gun's laser focus to always be aligned with the center of the weld seam. When the focus deviates too much, it is very easy to cause welding defects such as incomplete welding, missing welding, and insufficient filler metal. In severe cases, excessive local heat concentration can cause the casing substrate to burn through and deform, making it impossible to restore the casing's sealing performance and structural strength. This can lead to safety hazards such as water ingress and short circuits in the battery pack. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing laser brazing repair devices for damaged electric vehicle battery pack housings, the present invention is proposed.

[0006] Therefore, the problem that this invention aims to solve is that it is impossible to accurately perceive the trajectory changes of irregular welds, which makes it difficult for the laser focus of the laser gun to always be aligned with the center of the weld.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a laser brazing repair device for damaged battery pack casing of electric vehicle, comprising a welding assembly including a welding machine and a welding torch, wherein the welding torch is connected to the welding machine via a wire;

[0008] A positioning component, connected to the welding torch, includes a positioning element, which includes a positioning block. The positioning block has a slot inside, and a roller is provided in the slot. A support plate is rotatably connected to the outside of the roller. A rotating column is rotatably connected to one side of the support plate. A positioning sleeve is fixed at the end of the rotating column, and the welding torch is inserted into the positioning sleeve.

[0009] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, the positioning component further includes a connector, the connector including a connecting plate located at the bottom of the positioning block, a positioning post fixed at the bottom of the positioning block, the positioning post being rotatably connected to the connecting plate, and a strong magnet fixed at the bottom of the connecting plate.

[0010] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, the positioning component further includes a locking member, the locking member including a fixing ring fixed to the bottom of the connecting plate, a cavity is opened in the positioning column, a limit post is provided in the cavity, and a limit hole is opened on the fixing ring. The number of limit holes is multiple and they are evenly distributed in a ring on the fixing ring.

[0011] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, wherein: a fixing block is fixed at one end of the limiting post, a first spring is fixed on one side of the fixing block, the other end of the first spring is fixed to the inner wall of the cavity, a pressing rod is inserted into the bottom of the positioning post, and a force-bearing groove is provided on the fixing block.

[0012] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, the positioning component further includes a driving component, the driving component includes a fixed box fixed to one side of the support plate, a coil spring is provided inside the fixed box, a rotating column is provided inside the coil spring, a movable plate is provided outside the rotating column, a pulley is fixed outside the roller, and the pulley and the movable plate are connected by belt drive.

[0013] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, wherein: a fixing rod is fixed to the inner side of the movable plate, a fixing sleeve is fixed to the outer side of the rotating column, the fixing rod is inserted into the fixing sleeve and is movably connected to the fixing sleeve.

[0014] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, the positioning component further includes an adjusting component, the adjusting component includes a guide rail, the fixing rod has a groove, the inner wall of the groove is fixed with a guide shaft, the guide shaft is slidably connected to the guide rail, a connecting rod is fixed on one side of the guide rail, and a movable sleeve is fixed at one end of the connecting rod.

[0015] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, the positioning component further includes a trigger element, the trigger element including a movable sleeve rotatably connected to the inner side of the movable sleeve, a rotating sleeve inserted inside the movable sleeve, a spiral groove being formed on the rotating sleeve, a fixed shaft being fixed on the movable sleeve, the fixed shaft sliding within the spiral groove, and a support frame rotatably connected to the outer side of the rotating sleeve, one end of the support frame being fixed to the fixed box.

[0016] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, the rotating sleeve is fixed with a force-bearing rod at the bottom, the positioning block is fixed with a fixing frame at the top, and a lifting plate is inserted into the fixing frame.

[0017] As a preferred embodiment of the laser brazing repair device for damaged electric vehicle battery pack housing according to the present invention, wherein: a stabilizing block is fixed to the top of the movable sleeve, a stabilizing column is fixed to one side of the support frame, a second spring is sleeved on the outside of the stabilizing column, and the two ends of the second spring are respectively fixed to the stabilizing block and the support frame.

[0018] The beneficial effects of this invention are as follows: by setting the positioning component, the movement trajectory of the laser gun head can be constrained, so that it can only move along the trajectory of the weld, so that the laser focus is always aligned with the center of the weld with a small offset, thereby avoiding defects such as false welding, incomplete welding, substrate burn-through, and shell deformation from the root, ensuring that the repaired battery pack shell meets the strength requirements, and eliminating the safety hazards of water ingress and short circuit in the battery pack.

[0019] Depending on the size of the weld, the laser gun head can adaptively increase or decrease its moving speed. For wide and deep welds, it automatically reduces the moving speed and extends the laser irradiation time to ensure that the brazing filler metal is fully melted and fills the weld gap, avoiding pits and cold shuts. For narrow and shallow welds, it automatically increases the moving speed to reduce excessive heat concentration and prevent the substrate from overheating, deforming, or burning through, thus enabling on-demand energy supply for welds of different sizes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall structural diagram of a laser brazing repair device for damaged battery pack casings in electric vehicles.

[0022] Figure 2 A structural diagram of the positioning component for a laser brazing repair device for damaged electric vehicle battery pack casings.

[0023] Figure 3 Side view of the positioning block of a laser brazing repair device for damaged electric vehicle battery pack casing.

[0024] Figure 4 A cross-sectional view of the positioning column of a laser brazing repair device for damaged battery pack casings in electric vehicles.

[0025] Figure 5 A diagram showing the support plate and roller structure of a laser brazing repair device for damaged electric vehicle battery pack casings.

[0026] Figure 6 Laser brazing repair device for damaged battery pack casings in electric vehicles Figure 5 Enlarged view of the structure at point A in the middle.

[0027] Figure 7 A structural diagram of the adjustment component of a laser brazing repair device for damaged battery pack casings in electric vehicles.

[0028] Figure 8 A cross-sectional view of the fixing sleeve of a laser brazing repair device for damaged battery pack casings in electric vehicles.

[0029] In the diagram: 1. Welding assembly; 11. Welding machine; 12. Welding torch; 2. Positioning assembly; 21. Positioning component; 211. Positioning block; 211-1. Slot; 212. Roller; 213. Support plate; 214. Rotating column; 215. Positioning sleeve; 22. Connecting component; 221. Connecting plate; 222. Positioning column; 223. Strong magnet; 23. Locking component; 231. Fixing ring; 222-1. Chamber; 232. Limiting column; 231-1. Limiting hole; 234. Fixing block; 235. First spring; 236. Extrusion rod; 234-1. Force groove; 24. Driving component; 2 41. Fixed box; 242. Coil spring; 243. Rotating column; 244. Movable plate; 245. Pulley; 246. Fixed rod; 247. Fixed sleeve; 25. Adjusting component; 251. Guide rail; 246-1. Groove; 252. Guide shaft; 253. Connecting rod; 254. Movable sleeve; 26. Trigger; 261. Moving sleeve; 262. Rotating sleeve; 262-1. Spiral groove; 263. Fixed shaft; 264. Support frame; 265. Force-bearing rod; 266. Fixed frame; 267. Lifting plate; 268. Stabilizing block; 269. Stabilizing column; 260. Second spring. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1, referring to Figures 1-3 This is the first embodiment of the present invention. This embodiment provides a laser brazing repair device for damaged electric vehicle battery pack casings. The laser brazing repair device for damaged electric vehicle battery pack casings includes a welding assembly 1, which includes a welding machine 11 and a welding torch 12. The welding torch 12 is connected to the welding machine 11 through a wire. The operator holds the welding torch 12 and moves the welding head along the crack in the battery pack casing to repair the battery pack casing. This is prior art, and this solution will not be described in detail. Moreover, those skilled in the art can clearly understand the working principle.

[0034] The positioning component 2 is connected to the welding torch 12 and includes a positioning element 21. The positioning element 21 includes positioning blocks 211. There are multiple positioning blocks 211 arranged in a straight line. The multiple positioning blocks 211 are connected and can be rotated and adjusted at will in a chain-like manner to adjust the multiple positioning blocks 211 to the same shape as the weld.

[0035] The positioning block 211 has a slot 211-1 inside, and a roller 212 is installed in the slot 211-1. The inner wall of the slot 211-1 is relatively soft, and the outer side of the roller 212 is fixed with dense anti-slip spikes to increase the friction between the roller 212 and the inner wall of the slot 211-1. When the roller 212 rotates, it will move in the slot 211-1 and move along the shape of the positioning block 211.

[0036] The roller 212 is thinner at the center. A support plate 213 is rotatably connected to the outer side of the roller 212 via a bearing. A rotating column 214 is rotatably connected to one side of the support plate 213. A positioning sleeve 215 is fixed at the end of the rotating column 214. The welding head of the welding torch 12 is inserted into the positioning sleeve 215.

[0037] Multiple positioning blocks 211 are arranged in the same shape as the weld and placed on the side of the weld. At this time, the roller 212 will move in the slot 211-1 and along the shape of the multiple positioning blocks 211. The roller 212 will drive the rotating column 214 and the positioning sleeve 215 to move through the support plate 213, and drive the welding gun 12 to move along the trajectory of the weld through the positioning sleeve 215. This ensures that the laser focus is always aligned with the center of the weld with minimal offset, thereby avoiding defects such as false welding, missed welding, substrate burn-through, and shell deformation from the root cause. This ensures that the repaired battery pack shell meets the strength requirements and eliminates the safety hazards of water ingress and short circuit in the battery pack.

[0038] Example 2, refer to Figures 2-5 This is the first embodiment of the present invention, which is based on the previous embodiment.

[0039] Specifically, the positioning component 2 also includes a connector 22, the number of which corresponds to the number of positioning blocks 211. The connector 22 includes a connecting plate 221 located at the bottom of the positioning block 211. A positioning post 222 is fixed at the bottom of the positioning block 211. Two positioning posts 222 are fixed at the bottom of one positioning block 211. One connecting plate 221 is connected to two adjacent positioning posts 222. The positioning posts 222 are rotatably connected to the connecting plate 221. Through the cooperation of the positioning posts 222 and the connecting plate 221, two adjacent positioning blocks 211 are connected, thereby enabling multiple positioning blocks 211 to rotate and adjust their shape.

[0040] A strong magnet 223 is fixed to the bottom of the connecting plate 221. The strong magnet 223 firmly attracts the connecting plate 221 to the battery pack housing, thereby fixing the position of the positioning block 211 and preventing it from shifting.

[0041] The positioning assembly 2 also includes locking components 23. The number of locking components 23 corresponds to the number of positioning posts 222. Each locking component 23 includes a fixing ring 231 fixed to the bottom of the connecting plate 221. A cavity 222-1 is opened inside the positioning post 222. A limit post 232 is provided inside the cavity 222-1. A limit hole 231-1 is opened on the fixing ring 231. There are multiple limit holes 231-1, which are evenly distributed in a ring on the fixing ring 231. When the limit post 232 engages with the limit hole 231-1, the positioning post 222 and the connecting plate 221 can be locked by the cooperation of the two, and the positioning block 211 can be locked, so that the positioning block 211 cannot be rotated and adjusted. This prevents the welding torch 12 from changing its movement trajectory due to the rotation of the positioning block 211 during the movement of the welding torch 12.

[0042] One end of the limiting post 232 is fixed with a fixing block 234, and a first spring 235 is fixed on one side of the fixing block 234. The other end of the first spring 235 is fixed to the inner wall of the chamber 222-1. The first spring 235 is used to apply a pushing force to the fixing block 234, and through the fixing block 234, it drives the limiting post 232 to be separated from the limiting hole 231-1.

[0043] A pressing rod 236 is inserted into the bottom of the positioning post 222. A force-receiving groove 234-1 is provided on the fixing block 234. The inner wall of the force-receiving groove 234-1 is inclined. When the connecting plate 221 is attracted to the housing by the strong magnet 223, the bottom end of the pressing rod 236 will be pushed upward by the reverse force of the housing and press against the inclined surface of the inner wall of the force-receiving groove 234-1. The two work together to drive the fixing block 234 and the limiting post 232 to move, so that the limiting post 232 can be engaged with the limiting hole 231-1.

[0044] Example 3, referring to Figures 5-8 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0045] Specifically, the positioning component 2 also includes a driving component 24, which includes a fixed box 241 fixed to one side of the support plate 213. A coil spring 242 is provided inside the fixed box 241, and a rotating column 243 is provided inside the coil spring 242. One end of the rotating column 243 extends through to the outside of the fixed box 241 and is rotatably connected to the fixed box 241. A rotating rod is fixed to one end of the rotating column 243. Rotating the rotating rod can drive the rotating column 243 to rotate, and the rotating column 243 can tighten and charge the coil spring 242.

[0046] A movable plate 244 is provided on the outside of the rotating column 243. The movable plate 244 is arc-shaped and there are four of them, which are evenly distributed in a ring on the outside of the rotating column 243. A pulley 245 is fixed on the outside of the roller 212. The pulley 245 and the movable plate 244 are connected by belt drive. The belt used is elastic.

[0047] When the coil spring 242 releases its torsional force, it will drive the rotating column 243 to rotate, and the rotating column 243 will drive the movable plate 244 to rotate. At this time, the movable plate 244 will drive the pulley 245 to rotate via the belt, and thus the roller 212 will rotate via the pulley 245.

[0048] A fixing rod 246 is fixed inside the movable plate 244, and a fixing sleeve 247 is fixed outside the rotating column 243. The fixing rod 246 is inserted into the fixing sleeve 247 and is movably connected to the fixing sleeve 247. The number of fixing rods 246 and fixing sleeves 247 corresponds to the number of movable plates 244. The two work together to support and position the movable plate 244, and when the rotating column 243 rotates, it can drive the movable plate 244 to rotate.

[0049] The positioning component 2 also includes an adjusting component 25, which includes a guide rail 251. The guide rails 251 are inclined and their number corresponds to the number of fixed rods 246. The fixed rods 246 have a groove 246-1. A guide shaft 252 is fixed to the inner wall of the groove 246-1. The guide shaft 252 is slidably connected to the guide rail 251. A through groove is provided on the fixed sleeve 247. The guide rail 251 is movably connected to the through groove. A connecting rod 253 is fixed to one side of the guide rail 251. A movable sleeve 254 is fixed to one end of the connecting rod 253.

[0050] In the initial state, the annular diameter of the combination of the four movable plates 244 is close to the diameter of the pulley 245. Therefore, when the movable plates 244 drive the pulley 245 and the roller 212 to rotate via the belt, the roller 212 rotates at a slower speed, which makes the moving speed of the welding torch 12 slower. For wide and deep welds, reducing the moving speed can prolong the laser irradiation time, ensure that the brazing filler metal is fully melted and fills the weld gap, and avoid pit and cold shut defects.

[0051] When the movable sleeve 254 moves axially, it drives the guide rail 251 to move through the connecting rod 253. At this time, the guide rail 251 will squeeze the guide shaft 252 and push the fixed rod 246 to move, causing the fixed rod 246 to drive the movable plate 244 to expand outward. At this time, the annular diameter of the movable plate 244 assembly increases. When the movable plate 244 drives the pulley 245 and roller 212 to rotate, the rotation speed of the roller 212 will increase, and the moving speed of the welding torch 12 will be accelerated. For narrow and shallow welds, accelerating the moving speed can reduce excessive heat concentration, prevent the substrate from overheating and deforming or burning through, and realize the on-demand energy supply for welds of different sizes.

[0052] The positioning component 2 also includes a trigger 26, which includes a movable sleeve 261 rotatably connected to the inside of the movable sleeve 254 via a bearing. A rotating sleeve 262 is inserted into the movable sleeve 261. A spiral groove 262-1 is provided on the rotating sleeve 262. A fixed shaft 263 is fixed on the movable sleeve 261. The fixed shaft 263 slides in the spiral groove 262-1. When the rotating sleeve 262 rotates, the fixed shaft 263 will slide in the spiral groove 262-1. The two work together to drive the movable sleeve 261 to move, thereby enabling the movable sleeve 254 to move.

[0053] A support frame 264 is rotatably connected to the outside of the rotating sleeve 262. One end of the support frame 264 is fixed to the fixed box 241. The support frame 264 is L-shaped and is used to support and position the rotating sleeve 262.

[0054] A force-bearing rod 265 is fixed at the bottom of the rotating sleeve 262. The force-bearing rod 265 is inclined. A fixed frame 266 is fixed at the top of the positioning block 211. A lifting plate 267 is inserted into the fixed frame 266. The number of fixed frames 266 and lifting plates 267 corresponds to the number of positioning blocks 211. A threaded post is threadedly connected to the fixed frame 266. The end of the threaded post contacts the lifting plate 267. Tightening the threaded post can cause its end to press against the lifting plate 267 and lock the height of the lifting plate 267.

[0055] The lifting plate 267 at the top of the positioning block 211 located in the narrow and shallow weld position is moved upward, and the height of the lifting plate 267 is adjusted according to the narrowness and shallowness of the weld. The lifting plate 267 in the wide and deep weld position does not need to be moved.

[0056] When the roller 212 moves, it will simultaneously drive the force rod 265 to contact the lifting plate 267. When the roller 212 moves to the position of the narrow and shallow weld, the force rod 265 will contact the lifted lifting plate 267 and move upward under the thrust of the lifting plate 267, which will drive the rotating sleeve 262 to rotate. This will allow the rotating sleeve 262 to drive the moving sleeve 261 to move. The higher the lifting plate 267 moves, the greater the angle of rotation of the rotating sleeve 262, and the larger the diameter of the movable plate 244 after it expands outward. At the same time, the roller 212 moves faster.

[0057] A stabilizing block 268 is fixed to the top of the movable sleeve 261, and a stabilizing column 269 is fixed to one side of the support frame 264. The stabilizing column 269 is movably connected to the stabilizing block 268. The two work together to limit the movable sleeve 261 and prevent the movable sleeve 261 from rotating when it moves. A second spring 260 is sleeved on the outside of the stabilizing column 269. The two ends of the second spring 260 are fixed to the stabilizing block 268 and the support frame 264, respectively. When the force rod 265 cannot contact the lifting plate 267, it will lose the upward thrust. At this time, the second spring 260 can pull the movable sleeve 261 to move in the opposite direction and reset, and reset the movable plate 244.

[0058] In use, multiple positioning blocks 211 are arranged in the same shape as the weld and placed on the side of the weld. When the connecting plate 221 is attracted to the housing by the strong magnet 223, the bottom end of the extrusion rod 236 will be pushed upward by the reverse force of the housing and squeeze the inclined surface of the inner wall of the force groove 234-1. The two work together to drive the fixed block 234 and the limiting post 232 to move, so that the limiting post 232 can be locked with the limiting hole 231-1. The two work together to lock the positioning post 222 and the connecting plate 221 and lock the positioning block 211, so that the positioning block 211 cannot be rotated and adjusted. This avoids the situation where the rotation of the positioning block 211 during the movement of the welding torch 12 will cause the movement trajectory of the welding torch 12 to change.

[0059] Then the lifting plate 267 at the top of the positioning block 211 located in the narrow and shallow weld position is moved upward, and the height of the lifting plate 267 is adjusted according to the narrowness and shallowness of the weld. The lifting plate 267 in the wide and deep weld position does not need to be moved.

[0060] At this time, rotating the lever drives the rotating column 243 to rotate, and the rotating column 243 tightens and charges the coil spring 242, causing the roller 212 to enter the slot 211-1. The worker holds the welding torch 12 and only needs to hold it firmly; there is no need to apply excessive force to move the welding torch 12. When the coil spring 242 releases its torsional force, it drives the rotating column 243 to rotate, which in turn drives the movable plate 244 to rotate. At this time, the movable plate 244 drives the pulley 245 to rotate via a belt, which in turn drives the roller 212 to rotate. At this time, the roller 212 will... The roller 212 moves within the slot 211-1 and along the shape of multiple positioning blocks 211. The roller 212 drives the rotating column 214 and positioning sleeve 215 to move through the support plate 213, and drives the welding gun 12 to move along the weld seam trajectory through the positioning sleeve 215. This ensures that the laser focus is always aligned with the center of the weld seam with minimal offset, thus avoiding defects such as false welding, missed welding, substrate burn-through, and shell deformation from the root cause. This ensures that the repaired battery pack shell meets the strength requirements and eliminates the safety hazards of water ingress and short circuit in the battery pack. When the welding gun 12 moves, the user needs to match the power of the welding gun 12's movement.

[0061] In the initial state, the annular diameter of the combination of the four movable plates 244 is close to the diameter of the pulley 245. Therefore, when the movable plates 244 drive the pulley 245 and the roller 212 to rotate via the belt, the roller 212 rotates at a slower speed, which makes the moving speed of the welding torch 12 slower. For wide and deep welds, reducing the moving speed can prolong the laser irradiation time, ensure that the brazing filler metal is fully melted and fills the weld gap, and avoid pit and cold shut defects.

[0062] When the roller 212 moves, it will simultaneously drive the force rod 265 to contact the lifting plate 267. When the roller 212 moves to the position of the narrow and shallow weld, the force rod 265 will contact the lifted lifting plate 267 and move upward under the thrust of the lifting plate 267, and drive the rotating sleeve 262 to rotate. When the rotating sleeve 262 rotates, it will cause the fixed shaft 263 to slide in the spiral groove 262-1. Through the cooperation of the two, the moving sleeve 261 will move, thereby enabling the moving sleeve 261 to drive the movable sleeve 254 to move.

[0063] When the movable sleeve 254 moves, it drives the guide rail 251 to move via the connecting rod 253. At this time, the guide rail 251 will squeeze the guide shaft 252 and push the fixed rod 246 to move, causing the fixed rod 246 to drive the movable plate 244 to expand outward. At this time, the annular diameter of the movable plate 244 assembly increases. When the movable plate 244 drives the pulley 245 and roller 212 to rotate, the rotation speed of the roller 212 will increase, and the moving speed of the welding torch 12 will be accelerated. For narrow and shallow welds, accelerating the moving speed can reduce excessive heat concentration, prevent the substrate from overheating and deforming or burning through, and realize the on-demand energy supply for welds of different sizes.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A laser brazing repair device for damaged battery pack casings in electric vehicles, characterized in that: include, The welding assembly (1) includes a welding machine (11) and a welding torch (12), the welding torch (12) being connected to the welding machine (11) via a wire; The positioning component (2), connected to the welding torch (12), includes a positioning element (21). The positioning element (21) includes a positioning block (211). The positioning block (211) has a slot (211-1) inside. A roller (212) is provided in the slot (211-1). A support plate (213) is rotatably connected to the outside of the roller (212). A rotating column (214) is rotatably connected to one side of the support plate (213). A positioning sleeve (215) is fixed at the end of the rotating column (214). The welding torch (12) is inserted into the positioning sleeve (215).

2. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 1, characterized in that: The positioning component (2) further includes a connector (22), which includes a connecting plate (221) located at the bottom of the positioning block (211). A positioning post (222) is fixed at the bottom of the positioning block (211). The positioning post (222) is rotatably connected to the connecting plate (221). A strong magnet (223) is fixed at the bottom of the connecting plate (221).

3. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 2, characterized in that: The positioning component (2) further includes a locking component (23), which includes a fixing ring (231) fixed to the bottom of the connecting plate (221). A cavity (222-1) is opened in the positioning post (222), and a limiting post (232) is provided in the cavity (222-1). A limiting hole (231-1) is opened on the fixing ring (231), and there are multiple limiting holes (231-1) that are evenly distributed in a ring on the fixing ring (231).

4. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 3, characterized in that: One end of the limiting post (232) is fixed with a fixing block (234), and a first spring (235) is fixed on one side of the fixing block (234). The other end of the first spring (235) is fixed to the inner wall of the chamber (222-1). A pressing rod (236) is inserted into the bottom of the positioning post (222), and a force groove (234-1) is opened on the fixing block (234).

5. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 3 or 4, characterized in that: The positioning component (2) further includes a driving component (24), which includes a fixed box (241) fixed to one side of the support plate (213). A coil spring (242) is provided inside the fixed box (241), and a rotating column (243) is provided inside the coil spring (242). A movable plate (244) is provided on the outside of the rotating column (243), and a pulley (245) is fixed on the outside of the roller (212). The pulley (245) and the movable plate (244) are connected by belt drive.

6. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 5, characterized in that: A fixing rod (246) is fixed inside the movable plate (244), and a fixing sleeve (247) is fixed outside the rotating column (243). The fixing rod (246) is inserted into the fixing sleeve (247) and is movably connected to the fixing sleeve (247).

7. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 6, characterized in that: The positioning component (2) further includes an adjusting component (25), which includes a guide rail (251). A groove (246-1) is provided on the fixing rod (246). A guide shaft (252) is fixed on the inner wall of the groove (246-1). The guide shaft (252) is slidably connected to the guide rail (251). A connecting rod (253) is fixed on one side of the guide rail (251). A movable sleeve (254) is fixed at one end of the connecting rod (253).

8. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 7, characterized in that: The positioning component (2) further includes a trigger (26), which includes a movable sleeve (261) rotatably connected to the inside of the movable sleeve (254). A rotating sleeve (262) is inserted into the movable sleeve (261). A spiral groove (262-1) is provided on the rotating sleeve (262). A fixed shaft (263) is fixed on the movable sleeve (261). The fixed shaft (263) slides in the spiral groove (262-1). A support frame (264) is rotatably connected to the outside of the rotating sleeve (262). One end of the support frame (264) is fixed to the fixed box (241).

9. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 8, characterized in that: The bottom of the rotating sleeve (262) is fixed with a force rod (265), and the top of the positioning block (211) is fixed with a fixing frame (266). A lifting plate (267) is inserted into the fixing frame (266).

10. The laser brazing repair device for damaged electric vehicle battery pack casing as described in claim 8 or 9, characterized in that: A stabilizing block (268) is fixed to the top of the movable sleeve (261), and a stabilizing column (269) is fixed to one side of the support frame (264). A second spring (260) is sleeved on the outside of the stabilizing column (269), and the two ends of the second spring (260) are fixed to the stabilizing block (268) and the support frame (264) respectively.

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