Welding aid and laser welding device

Abstract

The application discloses a welding auxiliary device and a laser welding device. The welding auxiliary device comprises a dust collecting part in a hollow through enclosing structure, which is used for being arranged along a laser welding channel in a circumferential direction to provide a space range for smoke dust and foreign matter collection; a negative pressure structure arranged in the dust collecting part, which is used for forming a negative pressure environment in the dust collecting part, so that the smoke dust and foreign matter generated in welding are sucked into the dust collecting part under the action of a pressure difference; and a flow guiding part arranged in the dust collecting part, which is used for guiding the negative pressure flow, so that the negative pressure suction force generated by the negative pressure structure is uniformly distributed in the internal space of the dust collecting part, and the smoke dust and foreign matter collection efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of battery welding technology, and in particular to a welding auxiliary device and a laser welding device. Background Technology

[0002] In the manufacturing process of square steel-cased battery packs, laser welding is the primary technique for welding the battery pack to the busbars. During laser welding, the rapid melting and vaporization of the metal material at high temperatures inevitably generates a large amount of metal fumes and some tiny foreign particles. These fumes and foreign particles scatter and absorb some of the laser energy, resulting in a decrease in welding quality.

[0003] In related technologies, some laser welding auxiliary devices are equipped with a certain dust absorption function, but the negative pressure suction is unevenly distributed in the dust collection space, and the negative pressure suction in some areas is weak, making it difficult to suck the welding dust and foreign objects into the dust collection device in time, which affects the quality and efficiency of laser welding. Utility Model Content

[0004] This application provides a welding auxiliary device and a laser welding device to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a welding auxiliary device is provided for laser welding, comprising: a dust collection component, having a hollow, through-type enclosed structure, for being arranged circumferentially along the laser welding channel to provide a space for collecting fumes and foreign objects; a negative pressure structure, disposed within the dust collection component, for creating a negative pressure environment inside the dust collection component, so that fumes and foreign objects generated during welding are sucked into the dust collection component under the action of a pressure difference; and a flow guide component, disposed within the dust collection component, for guiding the negative pressure airflow, so that the negative pressure suction force generated by the negative pressure structure is evenly distributed in the internal space of the dust collection component, thereby improving the efficiency of fume and foreign object collection.

[0006] Optionally, the flow guide includes: a flow guide section forming a negative pressure channel distributed around the laser welding channel between itself and the inner wall of the dust collection component; the negative pressure structure connects to the negative pressure channel to provide a clear flow path for the negative pressure airflow; and an installation section connected between the flow guide section and the dust collection component to fix the flow guide section and ensure its stable flow guidance effect on the negative pressure airflow.

[0007] Optionally, the guide section has a hollow, through-type enclosed structure and is arranged around the laser welding channel. A negative pressure channel is formed between the outer wall of the guide section and the inner wall of the dust collection component, making full use of the internal space of the dust collection component and constructing a clear airflow path.

[0008] Optionally, the flow guide is provided with multiple flow holes, which are distributed circumferentially along the flow guide. The flow holes are connected to the negative pressure channel, providing multiple flow channels and inlets for the negative pressure airflow and improving the uniformity of the negative pressure suction distribution.

[0009] Optionally, the mounting part protrudes from the outer wall of the guide part and is fixed to the inner wall of the dust collection component, providing structural support for the negative pressure channel and making the device structure more stable.

[0010] Optionally, the mounting part is located at opposite ends of the flow guide and is arranged circumferentially along the flow guide. The mounting part is fixed and sealed to the inner wall of the dust collection component to prevent leakage of negative pressure airflow and ensure stable flow of negative pressure airflow.

[0011] Optionally, the negative pressure structure includes: an air extraction port, which is disposed through the side wall of the dust collection component and communicates with the negative pressure channel, providing a connection port for external vacuuming equipment to achieve effective collection of smoke, dust and foreign objects.

[0012] Optionally, the welding auxiliary device includes: a pressure head assembly, disposed inside the dust collection component and configured to adaptively contact the surface of the workpiece to be welded, automatically adjusting the contact state according to the unevenness of the workpiece surface to reduce incomplete welds; and a mounting component, connecting the pressure head assembly and the dust collection component, and having an avoidance structure corresponding to the laser welding channel to ensure that the laser normally irradiates the welding area.

[0013] Optionally, the pressure head assembly includes: multiple pressure heads distributed circumferentially along the laser welding channel, each independent and floating according to the actual contact position; and an elastic element connected between the mounting part and the pressure heads in a direction parallel to the laser welding channel, generating corresponding elastic feedback according to the pressure applied to the pressure heads, so that the busbar and the positive and negative terminals of the battery module are tightly attached.

[0014] Optionally, the pressure head includes: a guide portion, which is movably inserted into the mounting component in a direction parallel to the laser welding channel to provide precise guidance for the floating of the pressure head; a pressure head, which is fixedly connected to the guide portion; and an elastic element connected between the pressure head and the mounting component to allow the pressure head to adaptively float with the surface of the workpiece being welded, ensuring that the pressure is accurately and vertically applied to the busbar.

[0015] Optionally, the pressure distribution head includes: a contact portion, which protrudes from one side of the pressure head along a direction parallel to the laser welding channel, for contacting the surface of the workpiece to be welded, and can transmit pressure to the busbar more centrally; the end face area of ​​the contact portion near the pressure head is larger than the end face area away from the pressure head, so that the pressure distribution is more reasonable, the probability of simultaneous contact with positive and negative electrodes is reduced, and welding safety is ensured.

[0016] Optionally, the pressure head assembly includes: a guide sleeve, which is fixedly installed on the mounting component, and a guide part that is movably installed on the guide sleeve, to ensure smooth movement and accurate direction of the guide part, thereby ensuring welding stability and quality.

[0017] Optionally, the welding auxiliary device includes: an auxiliary gas duct connected to a pressure dividing head; the pressure dividing head has an auxiliary gas channel inside, one end of which is connected to the auxiliary gas duct, and the other end extends to the side of the pressure dividing head near the laser welding channel, delivering inert gas to the welding area to form a protective gas layer to prevent metal oxidation.

[0018] Optionally, the auxiliary gas duct is inserted through the dust collection component and the flow guide component to avoid the auxiliary gas ducts from getting tangled together, making full use of the internal space of the device and making the structure more compact.

[0019] Optionally, the welding auxiliary device includes: an auxiliary gas connector, which is located on the pressure dividing head and connects the auxiliary gas duct and the auxiliary gas channel to ensure a tight and leak-free connection, making connection and disassembly convenient and quick; an installation groove is provided on the side of the pressure dividing head away from the laser welding channel, and the auxiliary gas connector is located in the installation groove to avoid interference of the pressure dividing head movement with the guide component and to ensure that the auxiliary gas duct has sufficient space for arrangement.

[0020] According to a second aspect of this application, a laser welding apparatus is provided, including any of the welding auxiliary devices described above, to improve welding quality and efficiency, and to ensure the safety and stability of the welding process.

[0021] The welding auxiliary device of this application improves the collection efficiency of fumes and foreign objects during welding by setting a guide component on the dust collection component to make the negative pressure suction force evenly distributed.

[0022] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description 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 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.

[0023] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0024] Figure 1 This is a three-dimensional schematic diagram of the welding auxiliary device provided in the embodiments of this application; Figure 2 This is a top view schematic diagram of the welding auxiliary device provided in the embodiments of this application; Figure 3 yes Figure 2 A cross-sectional view of section AA; Figure 4This is an exploded schematic diagram of the welding auxiliary device provided in the embodiments of this application; Figure 5 This is a three-dimensional schematic diagram of the flow guide provided in the embodiments of this application; Figure 6 This is a perspective view of the pressure head assembly provided in the embodiments of this application; Figure 7 This is a three-dimensional schematic diagram of the welding auxiliary device and the workpiece to be welded provided in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Welding auxiliary equipment; 2. Laser welding channel; 4. The parts to be welded; 10. Dust collection components; 11. Negative pressure structure; 111. Air extraction port; 112. Negative pressure channel; 12. Flow guide; 121. Flow guide section; 1211. Flow passage; 122. Mounting section; 13. Pressure head assembly; 131. Pressure head; 1311. Guide section; 1312. Pressure head; 1313. Contact section; 1314. Auxiliary air passage; 1315. Mounting groove; 132. Elastic element; 133. Guide sleeve; 14. Mounting components; 141. Clearance structure; 15. Auxiliary gas tube; 16. Auxiliary gas connector. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0026] In related technologies, some laser welding auxiliary devices are equipped with a certain dust absorption function, but the negative pressure suction is unevenly distributed in the dust collection space, and the negative pressure suction in some areas is weak, making it difficult to suck the welding dust and foreign objects into the dust collection device in time, which affects the quality and efficiency of laser welding.

[0027] Regarding the above technical issues, firstly, refer to Figure 1 , Figure 2 , Figure 3This application provides a welding auxiliary device 1 for laser welding, comprising: a dust collection component 10, which is a hollow, through-type enclosed structure and is arranged circumferentially along the laser welding channel 2; a negative pressure structure 11, which is disposed in the dust collection component 10 and is used to form a negative pressure environment inside the dust collection component 10; and a flow guide 12, which is disposed in the dust collection component 10 and is used to guide the negative pressure airflow so that the negative pressure suction force generated by the negative pressure structure 11 is evenly distributed in the internal space of the dust collection component 10.

[0028] During laser welding, the dust collection component 10 is arranged circumferentially along the laser welding channel 2. The dust collection component 10 has a hollow, through-hole enclosure structure, providing space for the collection of smoke, dust, and foreign objects.

[0029] The negative pressure structure 11 is installed on the dust collection component 10 and starts working through an external dust collection device. After the external dust collection device is started, a negative pressure environment is formed inside the dust collection component 10 under the action of the negative pressure structure 11, so that the smoke and foreign objects generated during the laser welding process are sucked into the dust collection component 10 under the action of pressure difference.

[0030] The guide element 12 is installed inside the dust collection component 10 to guide the negative pressure airflow, so that the negative pressure suction force generated by the negative pressure structure 11 can be evenly distributed in the internal space of the dust collection component 10. This allows the smoke and dust and foreign objects generated around the laser welding position to be more effectively sucked into the dust collection component 10 under the action of uniform negative pressure suction, and then absorbed and carried away by the external dust collection equipment, thus achieving effective collection of smoke and foreign objects.

[0031] In this embodiment, by setting a guide 12 inside the dust collection component 10, the negative pressure suction is evenly distributed, ensuring that the smoke and foreign objects generated around the laser welding position can be effectively sucked in, thereby improving the collection efficiency of smoke and foreign objects during the welding process.

[0032] For example, the negative pressure structure 11 is an air extraction hole opened on the side wall of the dust collection component 10, which is connected to an external dust collection device. The guide component 12 is a spiral guide tube installed inside the dust collection component 10, one end of which is connected to the air extraction hole and spirally arranged along the inner side of the dust collection component 10. Multiple air guide holes are provided on the tube at intervals, so that the air guide holes are distributed spirally inside the dust collection component 10, thereby making the negative pressure suction force evenly distributed throughout the entire internal space of the dust collection component 10.

[0033] For example, the negative pressure structure 11 is an air extraction hole opened on the side wall of the dust collection component 10, which is connected to an external vacuum cleaner. The guide component 12 is a plurality of guide plates installed inside the dust collection component 10. The plurality of guide plates are arranged at a certain angle and spacing so that the guide plates can guide the airflow near one side of the dust collection component 10 to the other side, thereby avoiding the situation of excessive or insufficient local negative pressure, and ensuring that the negative pressure suction can be evenly distributed throughout the entire internal space of the dust collection component 10.

[0034] Both of the above specific examples can achieve the goal of setting a guide 12 inside the dust collection component 10, so that the negative pressure suction force generated by the negative pressure structure 11 is evenly distributed in the internal space of the dust collection component 10.

[0035] In some embodiments, reference Figure 3 , Figure 5 The flow guide 12 includes: a flow guide 121, which forms a negative pressure channel 112 surrounding the laser welding channel 2 between itself and the inner wall of the dust collector 10, and a negative pressure structure 11 communicating with the negative pressure channel 112; and an installation part 122, which is connected between the flow guide 121 and the dust collector 10.

[0036] In this embodiment, a negative pressure channel 112 surrounding the laser welding channel 2 is formed by setting a flow guide 121, and the flow guide 121 is used to guide the negative pressure airflow, so that the negative pressure suction generated by the negative pressure structure 11 can be evenly distributed in the internal space of the dust collection component 10 surrounding the laser welding channel 2, avoiding situations where the local negative pressure suction is too large or too small, and providing a more stable and uniform suction environment for the collection of smoke and foreign objects. The mounting part 122 is connected between the flow guide 121 and the dust collection component 10, and plays the role of fixing the flow guide 121, ensuring that the flow guide 121 can be stably positioned in a suitable position, so that the flow guide 121 can stably exert its guiding effect on the negative pressure airflow.

[0037] In some embodiments, reference Figure 3 , Figure 5 The guide section 121 has a hollow, through-hole enclosure structure and is arranged around the laser welding channel 2. A negative pressure channel 112 is formed between the outer wall of the guide section 121 and the inner wall of the dust collection component 10.

[0038] In this embodiment, the hollow through-enclosed structure of the flow guide 121 makes full use of the space inside the dust collection component 10. The compact sleeve design of the two allows other functional components, such as pressure head components, to be installed on the inner side of the flow guide 121.

[0039] Furthermore, the guide section 121 has a hollow, through-type enclosed structure and is arranged around the laser welding channel 2, creating a clear flow path for the negative pressure airflow. The airflow flows along the outer wall of the guide section 121 within the negative pressure channel 112. Guided by the guide section 121, the airflow can be evenly distributed within the internal space of the dust collection component 10 surrounding the laser welding channel 2, avoiding the problem of uneven distribution of negative pressure suction. This ensures that smoke and foreign objects in various areas around the laser welding position are subjected to a more consistent negative pressure suction, thereby improving the comprehensiveness and effectiveness of smoke and foreign object collection.

[0040] In some embodiments, reference Figure 3 , Figure 5The flow guide 121 is provided with a plurality of flow holes 1211, which are distributed circumferentially along the flow guide 121 and are connected to the negative pressure channel 112.

[0041] In this embodiment, multiple flow holes 1211 distributed circumferentially along the guide section 121 provide multiple flow channels and inlets for the negative pressure airflow. The negative pressure airflow can also act on the interior of the guide section 121 through the flow holes 1211, so that the negative pressure suction can act on the space around the laser welding position from multiple directions and positions, improving the uniformity of the negative pressure suction distribution, ensuring that smoke and foreign objects are subjected to a relatively consistent negative pressure suction regardless of their location in the laser welding channel 2, thereby improving the collection effect of smoke and foreign objects.

[0042] In some embodiments, reference Figure 3 , Figure 5 The mounting part 122 protrudes from the outer wall of the guide part 121 and is fixed to the inner wall of the dust collection part 10.

[0043] In this embodiment, the mounting part 122 protrudes from the outer wall of the guide part 121 and is fixed to the inner wall of the dust collection part 10, providing structural support for the negative pressure channel 112, making the structure of the entire welding auxiliary device 1 more stable, so that the shape and size of the negative pressure channel 112 will not change, ensuring the stability of the flow path of the negative pressure airflow.

[0044] Furthermore, the mounting portion 122, protruding from the outer wall of the guide portion 121, provides a clear positioning position for the installation of the guide component 12 within the dust collector 10. During installation, the mounting portion 122 can be easily fixedly connected to the inner wall of the dust collector 10, for example, by inserting bolts into the mounting portion 122 from the outside of the dust collector 10 to achieve installation and fixation, thereby enabling quick or easy installation and disassembly of the guide component 12, improving installation and maintenance efficiency.

[0045] In some embodiments, reference Figure 3 , Figure 5 The mounting part 122 is disposed at opposite ends of the flow guide part 121 and is disposed along the circumference of the flow guide part 121. The mounting part 122 is fixed and sealed to the inner wall of the dust collection component 10.

[0046] In this embodiment, when laser welding is performed, the negative pressure structure 11 creates a negative pressure environment inside the dust collector 10. Negative pressure airflow enters the space formed between the outer wall of the guide portion 121 and the inner wall of the dust collector 10. Since the mounting portion 122 is circumferentially fixed and sealed at opposite ends of the guide portion 121, this space is divided into a relatively independent and stable negative pressure channel 112, preventing leakage of negative pressure airflow from both ends of the guide portion 121. The negative pressure airflow flows within the negative pressure channel 112 and acts on the interior of the guide portion 121 through multiple flow holes 1211 on the guide portion 121. The flow holes 1211 allow negative pressure suction to act on the space around the laser welding position from multiple directions and positions, promoting more uniform diffusion of airflow within the internal space of the dust collector 10 surrounding the laser welding channel 2.

[0047] The sealing fit between the mounting part 122 and the inner wall of the dust collection component 10 provides better conditions for the negative pressure airflow to flow through the flow hole 1211. The flow hole 1211 provides multiple airflow inlets that are more evenly distributed, allowing the negative pressure suction to act on the space around the laser welding position from multiple directions; the optimized airflow distribution can more comprehensively capture the smoke and dust and foreign objects generated during the welding process, improving the collection effect.

[0048] In some embodiments, reference Figure 1 , Figure 3 , Figure 4 The negative pressure structure 11 includes: an air extraction port 111, which is disposed through the side wall of the dust collection component 10 and communicates with the negative pressure channel 112.

[0049] In this embodiment, the air extraction port 111 is disposed through the side wall of the dust collection component 10 and communicates with the negative pressure channel 112, providing a connection port for external vacuuming equipment.

[0050] In some embodiments, reference Figure 4 , Figure 7 The welding auxiliary device 1 includes: a pressure head assembly 13, which is disposed inside the dust collection component 10 and configured to adaptively contact the surface of the workpiece 4 to be welded; and a mounting component 14, which connects the pressure head assembly 13 and the dust collection component 10 and is provided with an avoidance structure 141 corresponding to the laser welding channel 2.

[0051] It is understandable that when laser welding battery packs, if the battery packs are not stacked evenly, gaps will appear between the busbars and the positive and negative electrodes of the battery module, making it impossible to fit tightly. This will affect the welding quality and the performance of the battery pack.

[0052] In this embodiment, since the pressure head assembly 13 is configured to adaptively contact the surface of the workpiece 4 to be welded, i.e., the surface of the busbar, it can automatically adjust its contact state according to the unevenness of the busbar surface. Under pressure, it gradually adheres to the positive and negative terminals of the battery module. This reduces the occurrence of incomplete welds due to poor contact, makes the welding process more stable, and improves the welding quality.

[0053] Furthermore, the clearance structure 141 ensures that the laser welding channel 2 is not blocked, allowing the laser to irradiate the welding area normally. At the same time, the negative pressure structure 11 inside the dust collection unit 10 continues to work, drawing the fumes and foreign objects generated during the welding process into the dust collection unit 10 through the guide component 12, ensuring a clean welding environment.

[0054] In some embodiments, reference Figure 3 , Figure 6 The pressure head assembly 13 includes: a plurality of pressure heads 131, which are distributed circumferentially along the laser welding channel 2; and an elastic element 132, which is connected between the mounting part 14 and the pressure heads 131 in a direction parallel to the laser welding channel 2.

[0055] Understandably, in actual battery pack stacking, the degree of unevenness at different locations may vary greatly, and the surface of the battery module may have depressions or tilts, making it difficult for the integral pressure head of related technologies to achieve precise pressure control for each local area.

[0056] In this embodiment, the pressure head assembly 13 includes multiple pressure heads 131 distributed circumferentially along the laser welding channel 2, such as four pressure heads 131, each of which is independent and can float according to the actual situation of the contact position.

[0057] Specifically, the elastic element 132 is connected between the mounting part 14 and the pressure divider head 131 along a direction parallel to the laser welding channel 2. When the pressure head assembly 13 approaches the battery module and contacts the busbar, each pressure divider head 131 is subjected to different degrees of compression depending on the contact condition between the busbar and the positive and negative terminals of the corresponding battery module. At this time, the elastic element 132 undergoes elastic deformation, generating corresponding elastic force feedback according to the magnitude of the pressure applied to the pressure divider head 131. Where the pressure is high, the elastic element 132 is compressed more severely, generating a greater elastic force, thereby providing greater pressure to the pressure divider head 131 at that location; where the pressure is low, the elastic element 132 deforms less, the elastic force is also smaller, and the pressure applied by the pressure divider head 131 is relatively smaller. In this way, multiple pressure dividers 131 can adaptively provide different pressures according to the contact conditions between the busbar and the positive and negative terminals of the battery module at different positions, so that the busbar as a whole can fit tightly with the positive and negative terminals of the battery module, thereby reducing the generation of welding defects, such as cold solder joints, over-soldering, and porosity, and improving the stability and consistency of welding quality.

[0058] In some embodiments, reference Figure 6 The pressure head 131 includes: a guide part 1311, which is movably inserted into the mounting part 14 in a direction parallel to the laser welding channel 2; a pressure head 1312, which is fixedly connected to the guide part 1311; and an elastic member 132 connected between the pressure head 1312 and the mounting part 14, which is used to make the pressure head 1312 adaptively float with the surface of the workpiece 4 to be welded.

[0059] In this embodiment, the guide part 1311 is movably inserted into the mounting part 14 in a direction parallel to the laser welding channel 2, providing precise guidance for the floating of the pressure head 1312, ensuring that the pressure head 1312 can only float in a direction parallel to the laser welding channel 2, avoiding deviation, and enabling the pressure to be accurately applied vertically to the busbar, thus improving the bonding effect.

[0060] In some embodiments, the pressure divider head 131 is made of H68 brass and has undergone passivation treatment, giving it good thermal conductivity and strength.

[0061] In some embodiments, reference Figure 3 , Figure 6 The pressure head 131 includes a contact portion 1313, which protrudes from one side of the pressure head 1312 in a direction parallel to the laser welding channel 2, for contacting the surface of the workpiece 4 to be welded; the end face area of ​​the contact portion 1313 near the pressure head 1312 is larger than the end face area away from the pressure head 1312.

[0062] In this embodiment, when the pressure head assembly 13 is pressed down, the contact portion 1313 contacts the busbar. Since the contact portion 1313 protrudes from the pressure head 1312, it can more concentratedly transmit pressure to the busbar. The end face area of ​​the contact portion 1313 near the pressure head 1312 is larger than the end face area away from the pressure head 1312, for example, it is a trapezoidal structure. This makes the pressure distribution more reasonable when pressure is applied to the contact portion 1313, with the larger end providing stable support and the smaller end acting more precisely on the welding area of ​​the busbar.

[0063] Furthermore, in the laser welding of battery modules, the positive and negative electrodes are usually close to each other. The trapezoidal structure of the contact portion 1313 results in a smaller end face area away from the pressure head 1312. When it contacts the busbar, it can accurately act on the corresponding area of ​​the busbar and the corresponding electrode, reducing the probability of it contacting the positive and negative electrodes at the same time and ensuring the safety of the welding process.

[0064] In some embodiments, reference Figure 4 The pressure head assembly 13 includes: a guide sleeve 133, which is fixedly inserted into the mounting member 14, and a guide part 1311, which is movably inserted into the guide sleeve 133.

[0065] In this embodiment, the guide sleeve 133 is fixedly inserted into the mounting part 14, and the guide part 1311 is movably inserted into the guide sleeve 133. The two cooperate with each other to ensure that the guide part 1311 moves smoothly and in a precise direction, thereby ensuring the stability and welding quality of the entire welding process.

[0066] The guide sleeve 133 is made of high-strength brass SP2 material and is inlaid with solid lubricant. When the guide part 1311 makes reciprocating linear motion in the guide sleeve 133, the solid lubricant in the guide sleeve 133 will form a lubricating film on the surface of the guide part 1311, reducing the friction between the guide part 1311 and the inner wall of the guide sleeve 133, making the movement of the guide part 1311 smoother.

[0067] The guide portion 1311 is made of SUS304 material, which has good corrosion resistance and mechanical properties. When mating with the guide sleeve 133, the smooth surface of the SUS304 guide portion 1311 results in a low coefficient of friction with the inner wall of the guide sleeve 133, maintaining stable movement. Furthermore, the guide portion 1311 has high dimensional accuracy, ensuring a tight fit with the guide sleeve 133 and preventing wobbling or misalignment during movement.

[0068] In some embodiments, a bolt is connected to one end of the guide portion 1311 that passes through the guide sleeve 133 for providing a limit.

[0069] It is understandable that when the pressure head 1312 is not in contact with the workpiece being welded, the guide part 1311 may completely protrude from one end of the guide sleeve 133 if there is no limiting structure.

[0070] In this embodiment, a bolt is provided in the guide portion 1311. When the guide portion 1311 moves to the limit position, the bolt head will contact the end face of the guide sleeve 133, preventing the guide portion 1311 from continuing to move, thereby preventing it from detaching from the guide sleeve 133.

[0071] In some embodiments, reference Figure 3 , Figure 6 The welding auxiliary device 1 includes: an auxiliary gas duct 15 connected to a pressure dividing head 131; the pressure dividing head 131 has an auxiliary gas channel 1314 inside, one end of the auxiliary gas channel 1314 is connected to the auxiliary gas duct 15, and the other end extends to the side of the pressure dividing head 131 near the laser welding channel 2.

[0072] In this embodiment, before welding begins, the auxiliary gas conduit 15 is connected to an external inert gas supply source. When welding starts, the external supply source delivers inert gas through the auxiliary gas conduit 15 to the auxiliary gas channel 1314 inside the pressure divider head 131. Since one end of the auxiliary gas channel 1314 is connected to the auxiliary gas conduit 15 and the other end extends to the side of the pressure divider head 131 near the laser welding channel 2, the inert gas is ejected from the outlet of the auxiliary gas channel 1314 under pressure, directly covering the welding area near the laser welding channel 2. A local inert gas environment is formed in the welding area, isolating air from the outside and effectively preventing the metal material from being oxidized at high temperatures, thereby ensuring the quality of the weld joint.

[0073] Furthermore, due to the design of the guide element 12, the negative pressure suction is not concentrated at a single point, but rather distributed relatively evenly around the welding area. When the inert gas is ejected from the auxiliary gas channel 1314, although it is subject to negative pressure suction, the uniformity of the suction prevents it from being rapidly drawn away by a strong suction force at a particular point immediately after ejection. The inert gas can form a relatively stable protective gas layer above the welding area, continuously protecting it.

[0074] Furthermore, the pressure head 131 of the pressure head assembly 13 not only serves to deliver inert gas during welding, but the pressure head 1312 also adaptively floats in a direction parallel to the laser welding channel 2, ensuring that the contact part 1313 can make good contact with the manifold and provide suitable pressure for welding. Simultaneously, the auxiliary gas conduit 15 delivers inert gas to the welding area through the auxiliary gas channel 1314 of the pressure head 131, forming a protective gas layer in the welding area. The movement of the pressure head assembly and the delivery of the inert gas work together to provide favorable conditions for the welding process.

[0075] In some embodiments, the auxiliary gas duct 15 passes through the dust collection member 10 and the flow guide member 12. During the assembly stage of the welding auxiliary device 1, the auxiliary gas duct 15 is passed through the pre-reserved holes in the dust collector 10 and the guide 12 in sequence according to the design path. By arranging the auxiliary gas duct 15 in the dust collector 10 and the guide 12 in a through-hole manner, it is possible to avoid the auxiliary gas duct 15 from getting tangled together and to make full use of the internal space of the device, making the entire welding auxiliary device 1 more compact in structure.

[0076] In some embodiments, reference Figure 3 , Figure 6 The welding auxiliary device 1 includes: an auxiliary gas connector 16, which is disposed on the pressure dividing head 131 and connected to the auxiliary gas conduit 15 and the auxiliary gas channel 1314; a mounting groove 1315 is provided on the side of the pressure dividing head 131 away from the laser welding channel 2, and the auxiliary gas connector 16 is located in the mounting groove 1315.

[0077] The auxiliary gas connector 16 ensures a tight, leak-free connection between the auxiliary gas conduit 15 and the auxiliary gas channel 1314. Furthermore, it facilitates quick and easy connection and disconnection between the auxiliary gas conduit 15 and the pressure divider head 131.

[0078] During the welding process, the pressure dividing head 131 may adaptively float according to the surface condition of the workpiece 4. The auxiliary gas connector 16 is set in the mounting groove 1315 on the side of the pressure dividing head 131 away from the laser welding channel 2, so that it will not interfere with the guide 12 due to the movement of the pressure dividing head 131. At the same time, it can also ensure that the auxiliary gas duct 15 has enough space to be arranged, avoiding problems such as entanglement and compression.

[0079] Secondly, embodiments of this application provide a laser welding apparatus, including the welding auxiliary device 1 of any of the above-mentioned claims. It also includes the advantages of the welding auxiliary device 1 of any of the above-mentioned claims.

[0080] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0081] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0082] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0083] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A welding auxiliary device (1) for laser welding, characterized in that, include: The dust collection component (10) has a hollow, through-hole enclosure structure and is used to be installed circumferentially along the laser welding channel (2); A negative pressure structure (11) is provided in the dust collection component (10) to form a negative pressure environment inside the dust collection component (10); A flow guide (12) is disposed on the dust collection component (10) to guide the negative pressure airflow so that the negative pressure suction force generated by the negative pressure structure (11) is evenly distributed in the internal space of the dust collection component (10).

2. The welding auxiliary device (1) according to claim 1, characterized in that, The flow guide (12) includes: The guide section (121) forms a negative pressure channel (112) around the laser welding channel (2) between itself and the inner wall of the dust collection component (10), and the negative pressure structure (11) is connected to the negative pressure channel (112); The mounting part (122) is connected between the flow guide part (121) and the dust collection part (10).

3. The welding auxiliary device (1) according to claim 2, characterized in that, The flow guide (121) has a hollow, through-hole enclosure structure and is arranged around the laser welding channel (2). The negative pressure channel (112) is formed between the outer wall of the flow guide (121) and the inner wall of the dust collection component (10).

4. The welding auxiliary device (1) according to claim 3, characterized in that, The flow guide (121) is provided with a plurality of flow holes (1211), which are distributed circumferentially along the flow guide (121) and are connected to the negative pressure channel (112).

5. The welding auxiliary device (1) according to claim 2, characterized in that, The mounting part (122) protrudes from the outer wall of the guide part (121) and is fixed to the inner wall of the dust collection part (10).

6. The welding auxiliary device (1) according to claim 2, characterized in that, The mounting part (122) is disposed at opposite ends of the flow guide part (121) and is disposed along the circumference of the flow guide part (121). The mounting part (122) is fixed and sealed to the inner wall of the dust collection component (10).

7. The welding auxiliary device (1) according to claim 2, characterized in that, The negative pressure structure (11) includes: An air extraction port (111) is disposed through the side wall of the dust collection component (10) and is connected to the negative pressure channel (112).

8. The welding auxiliary device (1) according to any one of claims 1 to 7, characterized in that, include: The pressure head assembly (13) is disposed inside the dust collection member (10) and is configured to adaptively contact the surface of the workpiece (4) to be welded; The mounting component (14) connects the pressure head assembly (13) and the dust collection component (10), and is provided with a clearance structure (141) corresponding to the laser welding channel (2).

9. The welding auxiliary device (1) according to claim 8, characterized in that, The pressure head assembly (13) includes: Multiple pressure dividing heads (131) are circumferentially spaced along the laser welding channel (2); An elastic element (132) is connected between the mounting element (14) and the pressure dividing head (131) in a direction parallel to the laser welding channel (2).

10. The welding auxiliary device (1) according to claim 9, characterized in that, The pressure divider head (131) includes: The guide part (1311) is movably inserted through the mounting part (14) in a direction parallel to the laser welding channel (2); The pressure head (1312) is fixedly connected to the guide part (1311); The elastic element (132) is connected between the pressure head (1312) and the mounting element (14) to allow the pressure head (1312) to adaptively float with the surface of the workpiece (4) being welded.

11. The welding auxiliary device (1) according to claim 10, characterized in that, The pressure divider head (131) includes: The contact part (1313) protrudes from one side of the pressure head (1312) in a direction parallel to the laser welding channel (2) and is used to contact the surface of the workpiece (4) to be welded. The end face area of ​​the contact portion (1313) near the pressure head (1312) is larger than the end face area away from the pressure head (1312).

12. The welding auxiliary device (1) according to claim 10, characterized in that, The pressure head assembly (13) includes: A guide sleeve (133) is fixedly inserted into the mounting component (14), and a guide portion (1311) is movably inserted into the guide sleeve (133).

13. The welding auxiliary device (1) according to claim 9, characterized in that, include: Auxiliary gas conduit (15) is connected to the pressure dividing head (131); The pressure dividing head (131) is provided with an auxiliary gas channel (1314) inside. One end of the auxiliary gas channel (1314) is connected to the auxiliary gas duct (15), and the other end extends to the side of the pressure dividing head (131) near the laser welding channel (2).

14. The welding auxiliary device (1) according to claim 13, characterized in that, The auxiliary gas duct (15) passes through the dust collection component (10) and the flow guide component (12).

15. The welding auxiliary device (1) according to claim 13, characterized in that, include: An auxiliary gas connector (16) is provided on the pressure dividing head (131) and connects the auxiliary gas conduit (15) to the auxiliary gas channel (1314); The pressure divider head (131) has a mounting groove (1315) on the side away from the laser welding channel (2), and the auxiliary gas connector (16) is located in the mounting groove (1315).

16. A laser welding apparatus, characterized in that, Includes the welding auxiliary device (1) as described in any one of claims 1 to 15.

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