Laser welding nozzle and laser welding device

Abstract

This application provides a laser welding nozzle and a laser welding apparatus. The laser welding nozzle includes a laser tube, an inlet structure, an outlet structure, and an annular structure. The laser tube is a laser channel; the inlet structure is annularly disposed on the laser tube and has an inlet hole that penetrates it, with its inner circumferential surface engaging with the outer circumferential surface of the laser tube; the outlet structure is annularly disposed on the laser tube and has an outlet hole that penetrates it, with one of the inlet and outlet structures connected to the laser tube, and the other movable back and forth between different positions along the extension direction of the laser tube; the annular structure is annularly disposed on the inlet and outlet structures, with one of the inlet and outlet structures connected to the annular structure, and the other abutting against the inner circumferential surface of the annular structure. This application improves the ease of use of the laser welding nozzle.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a laser welding nozzle and a laser welding apparatus. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the manufacturing process of battery cells, laser welding nozzles are usually used to weld the components of the battery cells. How to improve the ease of use of laser welding nozzles is a research direction in battery technology. Summary of the Invention

[0004] This application provides a laser welding nozzle and a laser welding apparatus, which can improve the ease of use of the laser welding nozzle.

[0005] This application provides a laser welding nozzle, including a laser tube, an inlet structure, an outlet structure, and an annular structure. The laser tube is a laser channel; the inlet structure is annularly disposed outside the laser tube and has an inlet hole penetrating through it, with its inner circumferential surface engaging with the outer circumferential surface of the laser tube; the outlet structure is annularly disposed outside the laser tube and has an outlet hole penetrating through it; the inlet and outlet structures are arranged along the extension direction of the laser tube, one of which is connected to the laser tube, and the other can reciprocate between different positions along the extension direction of the laser tube; the annular structure is annularly disposed around the inlet and outlet structures, with one of the inlet and outlet structures connected to the annular structure and the other abutting against the inner circumferential surface of the annular structure.

[0006] In the above technical solution, the laser welding nozzle of this application embodiment is configured to reciprocate between different positions along the extension direction of the laser tube to adjust the distance between the inlet and outlet structures. This means adjusting the size of the adjustment cavity formed by the surface of the inlet structure near the outlet structure, the surface of the outlet structure near the inlet structure, the outer circumferential surface of the laser tube, and the inner circumferential surface of the annular structure. When the distance between the inlet and outlet structures is zero, the volume of the adjustment cavity is zero, and the inlet and outlet are not connected. In this way, the laser welding nozzle can switch between a connected state and a disconnected state, thus opening and closing the outlet and improving the ease of use of the laser welding nozzle.

[0007] In some embodiments, one of the air intake structure and the air outlet structure that is reciprocating relative to the laser tube is threadedly engaged with the laser tube, and / or, one of the air intake structure and the air outlet structure that abuts against the inner circumferential surface of the annular structure is threadedly engaged with the annular structure.

[0008] In the above technical solution, reciprocating movement is achieved by using threaded engagement, which is convenient to operate and has high reliability.

[0009] In some embodiments, the extension direction of the vent is parallel to the extension direction of the laser tube.

[0010] In the above technical solution, the protective gas coming out of the vent will hardly have an impact on the molten pool, and can provide good protection for the molten pool.

[0011] In some embodiments, there are multiple vent holes, which are spaced apart around the laser tube.

[0012] In the above technical solution, the laser emanating from the laser channel can be protected, further reducing air contact with the molten pool.

[0013] In some embodiments, the laser tube is disposed within the vent hole, and the sidewall of the vent hole and the outer peripheral surface of the laser tube together form a cavity for venting.

[0014] In the above technical solution, most or even the entire periphery of the emitted laser can be protected, further reducing air contact with the molten pool.

[0015] In some embodiments, the air intake structure is fixedly connected to the laser tube and abuts against the inner circumferential surface of the annular structure, while the air outlet structure can reciprocate between different positions in the extension direction of the laser tube and is fixedly connected to the inner circumferential surface of the annular structure.

[0016] In the above technical solution, the air inlet structure is fixedly connected to the laser tube, and the air outlet structure is fixedly connected to the annular structure. This increases the mating area for the fixed connections in the laser welding nozzle, thereby improving the reliability and convenience of using the laser welding nozzle. It also facilitates assembly.

[0017] In some embodiments, the outer peripheral surface of the air intake structure is threadedly engaged with the inner peripheral surface of the annular structure, or the inner peripheral surface of the air outlet structure is threadedly engaged with the outer peripheral surface of the laser tube.

[0018] The above technical solution facilitates assembly and reduces the assembly difficulties caused by the two threaded mating areas.

[0019] In some embodiments, the air intake structure is integrally formed with the laser tube, and the air outlet structure is integrally formed with the annular structure.

[0020] Among the above technical solutions, the integral molding provides higher connection strength, thus further improving the reliability of laser welding nozzles.

[0021] In some embodiments, the air intake structure can reciprocate between different positions in the extension direction of the laser tube and is fixedly connected to the inner circumferential surface of the annular structure, and the air outlet structure is fixedly connected to the laser tube and abuts against the inner circumferential surface of the annular structure.

[0022] In the above technical solution, by setting the air inlet structure to be fixedly connected to the annular structure and the air outlet structure to be fixedly connected to the laser tube, the mating area of ​​the fixed connection in the laser welding nozzle can be increased, thereby improving the reliability and convenience of using the laser welding nozzle. It also facilitates assembly.

[0023] In some embodiments, the inner circumferential surface of the air intake structure is threadedly engaged with the outer circumferential surface of the laser tube, or the outer circumferential surface of the air outlet structure is threadedly engaged with the inner circumferential surface of the annular structure.

[0024] The above technical solution facilitates assembly and reduces the assembly difficulties caused by the two threaded mating areas.

[0025] In some embodiments, the air intake structure is fixedly connected to the laser tube and to the annular structure, and the air outlet structure can reciprocate between different positions in the extension direction of the laser tube; the inner circumferential surface of the air outlet structure is threadedly engaged with the outer circumferential surface of the laser tube, and / or the outer circumferential surface of the air outlet structure is threadedly engaged with the inner circumferential surface of the annular structure.

[0026] The above technical solution increases the mating area for fixed connection in the laser welding nozzle, thereby improving the reliability and convenience of using the laser welding nozzle. It also facilitates assembly.

[0027] In some embodiments, the exhaust structure is fixedly connected to the laser tube and to the annular structure, and the intake structure can reciprocate between different positions in the extension direction of the laser tube; the inner circumferential surface of the intake structure is threadedly engaged with the outer circumferential surface of the laser tube, and / or the outer circumferential surface of the intake structure is threadedly engaged with the inner circumferential surface of the annular structure.

[0028] The above technical solution increases the mating area for fixed connection in the laser welding nozzle, thereby improving the reliability and convenience of using the laser welding nozzle. It also facilitates assembly.

[0029] Secondly, embodiments of this application also provide a laser welding apparatus, including the aforementioned laser welding nozzle, shielding gas supply assembly, and laser emitting assembly. The shielding gas supply assembly is connected to an inlet and is used to supply shielding gas to the inlet. The laser emitting assembly is connected to a laser channel and is used to emit laser light into the laser channel. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0031] Figure 1 A schematic diagram of the structure of a laser welding nozzle provided in some embodiments of this application;

[0032] Figure 2 A cross-sectional view of a laser welding nozzle provided for some embodiments of this application;

[0033] Figure 3 A schematic diagram of the laser tube and air inlet structure in a laser welding nozzle provided in some embodiments of this application;

[0034] Figure 4 for Figure 3 A schematic diagram of the laser tube and air intake structure from another angle;

[0035] Figure 5 This is a schematic diagram of the gas outlet structure and the annular structure in a laser welding nozzle provided in some embodiments of this application.

[0036] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0037] 200. Laser welding nozzle;

[0038] 1. Laser tube; 11. Laser channel;

[0039] 2. Air intake structure; 21. Air intake port;

[0040] 3. Vent structure; 31. Vent hole;

[0041] 4. Ring structure;

[0042] 5. Adjust the cavity. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, 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; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0045] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0049] In this application, "multiple" means two or more (including two).

[0050] Laser welding nozzles are crucial components in the welding process, featuring both a protective gas channel and a laser channel. However, conventional laser welding nozzles cannot control the opening and closing of the protective gas channel, making them somewhat inconvenient to use.

[0051] In view of this, this application provides a laser welding nozzle, which improves the convenience of using the laser welding nozzle by setting an adjustment cavity and closing the protective gas outlet by opening and closing the adjustment cavity.

[0052] Figure 1 This is a schematic diagram of the structure of a laser welding nozzle provided in some embodiments of this application. Figure 2 A cross-sectional view of a laser welding nozzle provided for some embodiments of this application.

[0053] like Figure 1 and Figure 2 As shown, this application also provides a laser welding nozzle 200, which includes a laser tube 1, an air inlet structure 2, an air outlet structure 3, and an annular structure 4. The laser tube 1 has a laser channel 11. The air inlet structure 2 is annularly disposed around the laser tube 1 and has an air inlet hole 21 penetrating through it. The inner circumferential surface of the air inlet structure 2 is joined to the outer circumferential surface of the laser tube 1. The air outlet structure 3 is annularly disposed around the laser tube 1 and has an air outlet hole 31 penetrating through it. The air inlet structure 2 and the air outlet structure 3 are arranged along the extension direction of the laser tube 1. One of the air inlet structure 2 and the air outlet structure 3 is connected to the laser tube 1, and the other can reciprocate between different positions in the extension direction of the laser tube 1. The annular structure 4 is annularly disposed around the air inlet structure 2 and the air outlet structure 3. One of the air inlet structure 2 and the air outlet structure 3 is connected to the annular structure 4, and the other abuts against the inner circumferential surface of the annular structure 4.

[0054] The laser welding nozzle 200 of this embodiment has a first state and a second state. In the first state, the surface of the air inlet structure 2 near the air outlet structure 3, the surface of the air outlet structure 3 near the air inlet structure 2, the outer peripheral surface of the laser tube 1, and the inner peripheral surface of the annular structure 4 form an adjustment cavity 5, and both the air inlet hole 21 and the air outlet hole 31 are connected to the adjustment cavity 5. In the second state, the air inlet structure 2 and the air outlet structure 3 abut against each other, and the air inlet hole 21 and the air outlet hole 31 are staggered along the extension direction of the laser tube 1. The transition between the first state and the second state is achieved by reciprocating movement of the air inlet structure 2 or the air outlet structure 3 between different positions along the extension direction of the laser tube 1.

[0055] For example, laser tube 1 is a straight tube, and laser channel 11 is a straight channel.

[0056] In this embodiment, the air intake structure 2 is annularly disposed around the laser tube 1 and has an air intake hole 21. The inner circumferential surface of the air intake structure 2 is joined with the outer circumferential surface of the laser tube 1. That is, the air intake structure 2 includes an annular wall, and the air intake hole 21 is disposed through the annular wall. The joining refers to the contact and engagement between the inner circumferential surface of the air intake structure 2 and the outer circumferential surface of the laser tube 1. The two can be fitted together, threaded together, or integrally formed, etc.

[0057] For example, the air inlet 21 can be a straight hole or an angled hole. Optionally, there are two air inlets 21, which are respectively disposed on both sides of the laser tube 1.

[0058] In this embodiment, the venting structure 3 is annularly arranged around the laser tube 1 and has a through-hole 31. That is, the venting structure 3 is an annular wall, and the vent 31 is disposed through the annular wall. The vent 31 can be a straight hole, or a hole inclined towards or away from the laser tube 1. The inner circumferential surface of the venting structure 3 and the outer circumferential surface of the laser tube 1 can be joined together, or they can be spaced apart. Joining together refers to contact mating; the two can be fitted together, threaded together, or integrally formed, etc.

[0059] In this embodiment, one of the air intake structure 2 and the air outlet structure 3 is connected to the laser tube 1. One of the air intake structure 2 and the air outlet structure 3 can be fixedly connected to the laser tube 1, that is, it cannot move relative to the laser tube 1, for example, by welding. Alternatively, they can be connected but can move relative to the laser tube 1, for example, by threaded connection.

[0060] In this embodiment, the ability of one of the air intake structure 2 and the air outlet structure 3 to reciprocate between different positions in the extension direction of the laser tube 1 means that the air intake structure 2 or the air outlet structure 3 can reciprocate between at least two positions in the extension direction of the laser tube 1.

[0061] In this embodiment, the annular structure 4 is arranged around the air intake structure 2 and the air outlet structure 3. The connection between one of the air intake structure 2 and the air outlet structure 3 and the annular structure 4 means that the outer peripheral surface of one of the air intake structure 2 and the air outlet structure 3 is connected to the inner peripheral surface of the annular structure 4. Specifically, it can be a fixed connection, such as welding, or it can be connected by threaded connection or other means.

[0062] In this embodiment, one of the air intake structure 2 and the air outlet structure 3 that can reciprocate relative to the laser tube 1 is connected to the laser tube 1 so as to remain relatively stationary when not moving, and / or, one of the air intake structure 2 and the air outlet structure 3 that abuts against the inner circumferential surface of the annular structure 4 is connected to the annular structure 4 so as to remain relatively stationary when not moving.

[0063] For example, the air inlet structure 2 or the air outlet structure 3 can be connected to the outer peripheral surface of the laser tube 1 through a large frictional damping. For instance, the surfaces of the two that are in contact with each other are friction surfaces with large frictional force, maintaining relative stillness through friction. When movement is required, force is used to overcome the frictional force to achieve reciprocating movement. For example, the air inlet structure 2 or the air outlet structure 3 can be connected to the inner peripheral surface of the annular structure 4 through frictional damping.

[0064] For example, the laser tube 1 can be provided with multiple slots in its extension direction. The air inlet structure 2 or the air outlet structure 3 is provided with a retractable protrusion that cooperates with the slots. The two opposite surfaces of the slots in the extension direction of the laser tube 1 are inclined surfaces, which guide the protrusion to slide in or out. The reciprocating movement of the air inlet structure 2 or the air outlet structure 3 on the laser tube 1 is realized through the cooperation of the slots and the protrusion. Of course, slots can also be provided on the inner side of the annular structure 4. The protrusion structure may include a spring and a protrusion connected to one end of the spring.

[0065] In this embodiment, one of the air inlet structure 2 and the air outlet structure 3 is connected to the laser tube 1, and the other can reciprocate between different positions in the extension direction of the laser tube 1. One of the air inlet structure 2 and the air outlet structure 3 is connected to the annular structure 4, and the other abuts against the inner circumferential surface of the annular structure 4, including the following situations:

[0066] The air intake structure 2 is connected to the laser tube 1, the air outlet structure 3 can move back and forth, the air intake structure 2 is connected to the annular structure 4, and the air outlet structure 3 abuts against the inner circumferential surface of the annular structure 4.

[0067] The air intake structure 2 is connected to the laser tube 1, the air outlet structure 3 can move back and forth, the air intake structure 2 abuts against the inner circumferential surface of the annular structure 4, and the air outlet structure 3 is connected to the annular structure 4.

[0068] The air intake structure 2 can move back and forth, the air outlet structure 3 is connected to the laser tube 1, the air intake structure 2 is connected to the annular structure 4, and the air outlet structure 3 abuts against the inner circumferential surface of the annular structure 4.

[0069] The air intake structure 2 can move back and forth, the air outlet structure 3 is connected to the laser tube 1, the air intake structure 2 abuts against the inner circumferential surface of the annular structure 4, and the air outlet structure 3 is connected to the annular structure 4.

[0070] In the second state, the air intake structure 2 and the air outlet structure 3 abut against each other, and the air intake hole 21 and the air outlet hole 31 are staggered along the extension direction of the laser tube 1. This means that along the extension direction of the laser tube 1, the projection of any air intake hole 21 on the air outlet structure 3 does not coincide with the air outlet hole 31.

[0071] In this embodiment, the protective gas at the vent 31 protects the molten pool, reducing the likelihood of the molten metal reacting with oxygen in the air to form deposits. These deposits can accumulate inside the weld, creating microcracks and reducing weld strength. Therefore, the protective gas at the vent 31 improves weld strength. For example, when laser welding is used between the aluminum casing and top cover of a battery cell, if the molten pool is not effectively protected during the laser welding process, the molten aluminum can easily react with oxygen in the air, causing alumina ceramic deposits to form inside the weld, creating microcracks and reducing the bonding strength between the aluminum casing and the top cover. Furthermore, during subsequent use, with repeated charging and discharging of the battery cell, the cracks grow and expand under stress during the expansion and contraction of the aluminum casing, increasing the risk of leakage. The protective gas protects the molten pool, reducing air contact with it, thereby improving weld strength and reducing the risk of leakage.

[0072] The laser welding nozzle 200 of this application embodiment is configured to reciprocate between different positions in the extension direction of the laser tube 1 by setting the air inlet structure 2 or the air outlet structure 3 to adjust the distance between the air inlet structure 2 and the air outlet structure 3. That is, the size of the adjustment cavity 5 is formed by adjusting the surface of the air inlet structure 2 near the air outlet structure 3, the surface of the air outlet structure 3 near the air inlet structure 2, the outer peripheral surface of the laser tube 1, and the inner peripheral surface of the annular structure 4. When the distance between the air inlet structure 2 and the air outlet structure 3 is zero, the volume of the adjustment cavity 5 is zero, and the air inlet 21 and the air outlet 31 are not connected. In this way, the laser welding nozzle 200 can switch between the state in which the air inlet 21 and the air outlet 31 are connected and the state in which the air inlet 21 and the air outlet 31 are not connected, that is, switch between the first state and the second state mentioned above, realize the opening and closing of the air outlet 31, thereby improving the convenience of using the laser welding nozzle 200.

[0073] In some embodiments, one of the air intake structure 2 and the air outlet structure 3 that is reciprocating relative to the laser tube 1 is threadedly engaged with the laser tube 1, and / or, one of the air intake structure 2 and the air outlet structure 3 that abuts against the inner circumferential surface of the annular structure 4 is threadedly engaged with the annular structure 4.

[0074] The reciprocating movement is achieved by using a threaded connection, which makes it convenient to operate and has high reliability.

[0075] In some embodiments, the extension direction of the vent 31 is parallel to the extension direction of the laser tube 1.

[0076] In this embodiment, the air outlet 31 is a straight hole.

[0077] With this configuration, the protective gas coming out of the vent 31 will hardly have any impact on the molten pool, thus providing good protection for the molten pool.

[0078] In some embodiments, there are multiple air vents 31, which are spaced apart around the laser tube 1.

[0079] For example, the number of vents 31 may be four, five, six, seven, or eight, etc.

[0080] In this embodiment, the vent 31 can be a round hole or a strip hole, with the strip hole extending along the outer periphery of the laser tube 1.

[0081] In this way, the laser emitted from laser channel 11 can be protected, further reducing the contact of air with the molten pool.

[0082] Optionally, the multiple air outlets 31 are arranged in a ring at equal intervals.

[0083] In some embodiments, the laser tube 1 is disposed in the vent 31, and the sidewall of the vent 31 and the outer peripheral surface of the laser tube 1 together form a cavity for venting.

[0084] For example, the laser tube 1 is located in the center of the vent 31, and the sidewall of the vent 31 and the outer peripheral surface of the laser tube 1 together form an annular cavity.

[0085] This configuration can protect most or even the entire perimeter of the emitted laser, further reducing air contact with the molten pool.

[0086] Figure 3 A schematic diagram of the laser tube and air inlet structure in a laser welding nozzle provided in some embodiments of this application; Figure 4 for Figure 3 A schematic diagram of the laser tube and air intake structure from another angle; Figure 5 This is a schematic diagram of the gas outlet structure and the annular structure in a laser welding nozzle provided in some embodiments of this application.

[0087] Please see Figures 2-5 In some embodiments, the air intake structure 2 is fixedly connected to the laser tube 1 and abuts against the inner circumferential surface of the annular structure 4, and the air outlet structure 3 can reciprocate between different positions in the extension direction of the laser tube 1 and is fixedly connected to the inner circumferential surface of the annular structure 4.

[0088] In this embodiment, the air intake structure 2 is fixedly connected to the laser tube 1. The air intake structure 2 and the laser tube 1 can be fixedly connected by welding or bonding.

[0089] In this embodiment, the air outlet structure 3 and the inner circumferential surface of the annular structure 4 are fixedly connected. The air outlet structure 3 and the annular structure 4 can be fixedly connected by welding or bonding.

[0090] In this embodiment, the outer peripheral surface of the air intake structure 2 can be a smooth surface, fitting snugly against the annular structure 4. The air intake structure 2 can also be threadedly engaged with the annular structure 4. Similarly, the inner peripheral surface of the air outlet structure 3 in this embodiment can be a smooth surface, fitting snugly against the laser tube 1. The air outlet structure 3 can also be threadedly engaged with the laser tube 1. However, at least one of the air intake structure 2 and the air outlet structure 3 needs to be connected to a corresponding component to remain relatively stationary when not moving.

[0091] By configuring the air inlet structure 2 to be fixedly connected to the laser tube 1 and the air outlet structure 3 to be fixedly connected to the annular structure 4, the mating area of ​​the fixed connection in the laser welding nozzle 200 is increased, thereby improving the reliability and convenience of using the laser welding nozzle 200. It also facilitates assembly.

[0092] In some embodiments, the outer peripheral surface of the air intake structure 2 is threadedly engaged with the inner peripheral surface of the annular structure 4, or the inner peripheral surface of the air outlet structure 3 is threadedly engaged with the outer peripheral surface of the laser tube 1.

[0093] When the inner circumferential surface of the exhaust structure 3 is threadedly engaged with the outer circumferential surface of the laser tube 1, at least one of the outer circumferential surface of the intake structure 2 and the inner circumferential surface of the annular structure 4 can be a smooth surface or a surface with greater friction, such as a frosted surface.

[0094] When the outer peripheral surface of the air intake structure 2 is threadedly engaged with the inner peripheral surface of the annular structure 4, at least one of the inner peripheral surface of the air outlet structure 3 and the outer peripheral surface of the laser tube 1 can be a smooth surface or a surface with greater friction, such as a frosted surface.

[0095] This design facilitates assembly and reduces assembly difficulties caused by the two threaded mating areas.

[0096] In some embodiments, the air intake structure 2 is integrally formed with the laser tube 1, and the air outlet structure 3 is integrally formed with the annular structure 4.

[0097] The one-piece molding provides higher connection strength, thus further improving the reliability of the laser welding nozzle 200.

[0098] In some embodiments, the air intake structure 2 can reciprocate between different positions in the extension direction of the laser tube 1 and is fixedly connected to the inner circumferential surface of the annular structure 4, and the air outlet structure 3 is fixedly connected to the laser tube 1 and abuts against the inner circumferential surface of the annular structure 4.

[0099] In this embodiment, the outer peripheral surface of the air intake structure 2 is fixedly connected to the inner peripheral surface of the annular structure 4, and the two can be connected by welding or bonding.

[0100] In this embodiment, the inner circumferential surface of the gas outlet structure 3 is fixedly connected to the outer circumferential surface of the laser tube 1, and the two can be connected by welding or bonding.

[0101] In this embodiment, the inner circumferential surface of the air intake structure 2 and the outer circumferential surface of the laser tube 1 can both be smooth surfaces and fit together, or they can be threaded together. Similarly, the outer circumferential surface of the air outlet structure 3 and the inner circumferential surface of the annular structure 4 can both be smooth surfaces and fit together, or they can be threaded together. However, at least one of the air intake structure 2 and the air outlet structure 3 needs to be connected to a corresponding component to remain relatively stationary when not moving.

[0102] By configuring the air inlet structure 2 to be fixedly connected to the annular structure 4 and the air outlet structure 3 to be fixedly connected to the laser tube 1, the mating area of ​​the fixed connection in the laser welding nozzle 200 can be increased, thereby improving the reliability and convenience of using the laser welding nozzle 200. It also facilitates assembly.

[0103] In some embodiments, the inner circumferential surface of the air intake structure 2 is threadedly engaged with the outer circumferential surface of the laser tube 1, or the outer circumferential surface of the air outlet structure 3 is threadedly engaged with the inner circumferential surface of the annular structure 4.

[0104] This design facilitates assembly and reduces assembly difficulties caused by the two threaded mating areas.

[0105] In some embodiments, the air intake structure 2 is integrally formed with the annular structure 4, and the air outlet structure 3 is integrally formed with the laser tube 1.

[0106] In some embodiments, the air intake structure 2 is fixedly connected to the laser tube 1 and to the annular structure 4, and the air outlet structure 3 can reciprocate between different positions in the extension direction of the laser tube 1; the inner circumferential surface of the air outlet structure 3 is threadedly engaged with the outer circumferential surface of the laser tube 1, and / or the outer circumferential surface of the air outlet structure 3 is threadedly engaged with the inner circumferential surface of the annular structure 4.

[0107] In this embodiment, the inner circumferential surface of the air intake structure 2 is fixedly connected to the outer circumferential surface of the laser tube 1, specifically by welding or integral molding. Similarly, the outer circumferential surface of the air intake structure 2 is fixedly connected to the inner circumferential surface of the annular structure 4, also specifically by welding or integral molding.

[0108] This design increases the mating area for the fixed connection in the laser welding nozzle 200, thereby improving the reliability and convenience of using the laser welding nozzle 200. It also facilitates assembly.

[0109] In some embodiments, the exhaust structure 3 is fixedly connected to the laser tube 1 and to the annular structure 4, and the intake structure 2 can reciprocate between different positions in the extension direction of the laser tube 1; the inner circumferential surface of the intake structure 2 is threadedly engaged with the outer circumferential surface of the laser tube 1, and / or the outer circumferential surface of the intake structure 2 is threadedly engaged with the inner circumferential surface of the annular structure 4.

[0110] In this embodiment, the inner circumferential surface of the gas outlet structure 3 is fixedly connected to the outer circumferential surface of the laser tube 1, specifically by welding or integral molding. Similarly, the outer circumferential surface of the gas outlet structure 3 is fixedly connected to the inner circumferential surface of the annular structure 4, also specifically by welding or integral molding.

[0111] This design increases the mating area for the fixed connection in the laser welding nozzle 200, thereby improving the reliability and convenience of using the laser welding nozzle 200. It also facilitates assembly.

[0112] Secondly, this application also provides a laser welding apparatus, including the aforementioned laser welding nozzle 200, a shielding gas supply component, and a laser emitting component. The shielding gas supply component is connected to the air inlet 21 and is used to supply shielding gas to the air inlet 21. The laser emitting component is connected to the laser channel 11 and is used to emit laser light into the laser channel 11.

[0113] For example, the protective gas supply component includes a protective gas cylinder.

[0114] For example, a laser emitting component includes a laser.

[0115] Please see Figures 2-5This application provides a laser welding nozzle 200, which includes a laser tube 1, an air inlet structure 2, an air outlet structure 3, and an annular structure 4. The laser tube 1 has a laser channel 11. The air inlet structure 2 is fitted around the laser tube 1 and has an air inlet hole 21 penetrating through it. The air outlet structure 3 is fitted around the laser tube 1 and has an air outlet hole 31 penetrating through it. The air inlet structure 2 and the air outlet structure 3 are arranged along the extension direction of the laser tube 1. One of the air inlet structure 2 and the air outlet structure 3 is connected to the laser tube 1, while the other can reciprocate between different positions along the extension direction of the laser tube 1. The annular structure 4 is fitted around the air inlet structure 2 and the air outlet structure 3. One of the air inlet structure 2 and the air outlet structure 3 is connected to the annular structure 4, while the other abuts against the inner circumferential surface of the annular structure 4. The laser welding nozzle 200 has a first state and a second state. In the first state, the surface of the air inlet structure 2 near the air outlet structure 3, the surface of the air outlet structure 3 near the air inlet structure 2, the outer peripheral surface of the laser tube 1, and the inner peripheral surface of the annular structure 4 form an adjustment cavity 5. Both the air inlet hole 21 and the air outlet hole 31 are connected to the adjustment cavity 5. In the second state, the air inlet structure 2 and the air outlet structure 3 abut against each other, and the air inlet hole 21 and the air outlet hole 31 are staggered along the extension direction of the laser tube 1. The extension direction of the air outlet hole 31 is parallel to the extension direction of the laser tube 1. There are multiple air outlet holes 31, which are spaced apart around the laser tube 1. The air inlet structure 2 is fixedly connected to the laser tube 1 and abuts against the inner peripheral surface of the annular structure 4. The air outlet structure 3 can reciprocate between different positions in the extension direction of the laser tube 1 and is fixedly connected to the annular structure 4. The inner peripheral surface of the air outlet structure 3 is threadedly engaged with the outer peripheral surface of the laser tube 1.

[0116] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A laser welding nozzle, characterized in that, include: A laser tube, wherein the tube of the laser tube is a laser channel; An air intake structure is arranged around the laser tube and has an air intake hole that penetrates through it; the inner circumferential surface of the air intake structure is joined to the outer circumferential surface of the laser tube. An exhaust structure is arranged around the laser tube and has an exhaust hole that passes through it. The intake structure and the exhaust structure are arranged along the extension direction of the laser tube. One of the intake structure and the exhaust structure is connected to the laser tube, and the other can move back and forth between different positions in the extension direction of the laser tube. A ring structure is arranged around the air intake structure and the air outlet structure, wherein one of the air intake structure and the air outlet structure is connected to the ring structure, and the other abuts against the inner circumferential surface of the ring structure; The laser welding nozzle has a first state and a second state. In the first state, the surface of the air inlet structure near the air outlet structure, the surface of the air outlet structure near the air inlet structure, the outer peripheral surface of the laser tube, and the inner peripheral surface of the annular structure form an adjustment cavity, and the air inlet and the air outlet are both connected to the adjustment cavity. In the second state, the air inlet structure and the air outlet structure abut against each other, and the air inlet and the air outlet are staggered along the extension direction of the laser tube.

2. The laser welding nozzle according to claim 1, characterized in that, One of the air intake structure and the air outlet structure that is reciprocating relative to the laser tube is threadedly engaged with the laser tube, and / or, one of the air intake structure and the air outlet structure that abuts against the inner circumferential surface of the annular structure is threadedly engaged with the annular structure.

3. The laser welding nozzle according to claim 1, characterized in that, The extension direction of the vent is parallel to the extension direction of the laser tube.

4. The laser welding nozzle according to claim 3, characterized in that, The number of air outlets is multiple, and the multiple air outlets are arranged at intervals around the laser tube.

5. The laser welding nozzle according to claim 1, characterized in that, The laser tube is disposed in the vent hole, and the sidewall of the vent hole and the outer peripheral surface of the laser tube together form a cavity for venting.

6. The laser welding nozzle according to claim 1, characterized in that, The air intake structure is fixedly connected to the laser tube and abuts against the inner circumferential surface of the annular structure. The air outlet structure can reciprocate between different positions in the extension direction of the laser tube and is fixedly connected to the inner circumferential surface of the annular structure.

7. The laser welding nozzle according to claim 6, characterized in that, The outer peripheral surface of the air intake structure is threadedly engaged with the inner peripheral surface of the annular structure, or the inner peripheral surface of the air outlet structure is threadedly engaged with the outer peripheral surface of the laser tube.

8. The laser welding nozzle according to claim 7, characterized in that, The air intake structure is integrally formed with the laser tube, and the air outlet structure is integrally formed with the annular structure.

9. The laser welding nozzle according to claim 1, characterized in that, The air intake structure can reciprocate between different positions in the extension direction of the laser tube and is fixedly connected to the inner circumferential surface of the annular structure. The air outlet structure is fixedly connected to the laser tube and abuts against the inner circumferential surface of the annular structure.

10. The laser welding nozzle according to claim 9, characterized in that, The inner circumferential surface of the air intake structure is threadedly engaged with the outer circumferential surface of the laser tube, or the outer circumferential surface of the air outlet structure is threadedly engaged with the inner circumferential surface of the annular structure.

11. The laser welding nozzle according to claim 1, characterized in that, The air intake structure is fixedly connected to the laser tube and the annular structure, and the air outlet structure can reciprocate between different positions in the extension direction of the laser tube. The inner circumferential surface of the gas outlet structure is threadedly engaged with the outer circumferential surface of the laser tube, and / or the outer circumferential surface of the gas outlet structure is threadedly engaged with the inner circumferential surface of the annular structure.

12. The laser welding nozzle according to claim 1, characterized in that, The air outlet structure is fixedly connected to the laser tube and the annular structure, and the air inlet structure can reciprocate between different positions in the extension direction of the laser tube. The inner circumferential surface of the air intake structure is threadedly engaged with the outer circumferential surface of the laser tube, and / or the outer circumferential surface of the air intake structure is threadedly engaged with the inner circumferential surface of the annular structure.

13. A laser welding apparatus, characterized in that, include: The laser welding nozzle as described in any one of claims 1-12; A protective gas supply component is connected to the air inlet and is used to supply protective gas to the air inlet; as well as A laser emitting component is connected to the laser channel and is used to emit laser light into the laser channel.

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