Laser welding nozzle and laser welding device

Abstract

The embodiment of the invention provides a laser welding nozzle and a laser welding device. The laser welding nozzle comprises a laser tube, an air inlet structure, an air outlet structure and an annular structure. A pipeline of the laser tube is a laser channel; the air inlet structure is annularly arranged on the laser tube and is provided with an air inlet hole penetrating through the air inlet structure; the inner circumferential surface of the air inlet structure is jointed with the outer circumferential surface of the laser tube; the air outlet structure is annularly arranged on the laser tube and provided with an air outlet hole penetrating through the air outlet structure, one of the air inlet structure and the air outlet structure is connected to the laser tube, and the other one can reciprocate between different positions in the extending direction of the laser tube; the annular structure is arranged around the air inlet structure and the air outlet structure, one of the air inlet structure and the air outlet structure is connected with the annular structure, and the other one abuts against the inner circumferential face of the annular structure. The use convenience of the laser welding nozzle can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a laser welding nozzle and a laser welding device. Background Art

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

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

[0004] The present application provides a laser welding nozzle and a laser welding device, which can improve the convenience of using the laser welding nozzle.

[0005] The embodiment of the present application provides a laser welding nozzle, including a laser tube, an air intake structure, an air outlet structure and an annular structure. The pipeline of the laser tube is a laser channel; the air intake structure is arranged outside the laser tube and is provided with an air intake hole penetrating through it, and the inner circumference of the air intake structure is engaged with the outer circumference of the laser tube; the air outlet structure is arranged outside the laser tube and is provided with an air outlet hole penetrating through it, the air intake structure and the air outlet structure are arranged along the extension direction of the laser tube, one of the air intake structure and the air outlet structure is connected to the laser tube, and the other can reciprocate between different positions in the extension direction of the laser tube; the annular structure is arranged around the air intake structure and the air outlet structure, one of the air intake structure and the air outlet structure is connected to the annular structure, and the other is against the inner circumference of the annular structure.

[0006] In the above technical solution, the laser welding nozzle of the embodiment of the present application adjusts the distance between the air inlet structure and the air outlet structure by setting the air inlet structure or the air outlet structure to be reciprocatingly movable between different positions in the extension direction of the laser tube, that is, adjusting the size of the adjustment cavity formed by the surface of the air inlet structure close to the air outlet structure, the surface of the air outlet structure close to the air inlet structure, the outer peripheral surface of the laser tube, and the inner peripheral surface of the annular structure. When the distance between the air inlet structure and the air outlet structure is zero, the volume of the adjustment cavity is zero, and the air inlet and the air outlet are not connected. In this way, the laser welding nozzle can switch between the state where the air inlet and the air outlet are connected and the state where the air inlet and the air outlet are not connected, realizing the opening and closing of the air outlet, thereby improving the convenience of using the laser welding nozzle.

[0007] In some embodiments, one of the air inlet structure and the air outlet structure that can reciprocate relative to the laser tube is threadedly matched with the laser tube, and / or one of the air inlet structure and the air outlet structure that abuts against the inner circumference of the annular structure is threadedly matched with the annular structure.

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

[0009] In some embodiments, an extension direction of the gas outlet hole is parallel to an extension direction of the laser tube.

[0010] In the above technical solution, the shielding gas coming out of the gas outlet hardly has an impact on the molten pool, and can provide good protection for the molten pool.

[0011] In some embodiments, there are multiple air outlet holes, and the multiple air outlet holes are arranged at intervals around the laser tube.

[0012] In the above technical solution, a protective effect can be exerted on the laser circle emitted from the laser channel, further reducing the contact of air with the molten pool.

[0013] In some embodiments, the laser tube is disposed in the gas outlet hole, and the side wall of the gas outlet hole and the outer peripheral surface of the laser tube are jointly arranged to form a cavity for gas outlet.

[0014] In the above technical solution, a protective effect can be exerted on most or even the entire circumference of the emitted laser, further reducing the contact of air with the molten pool.

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

[0016] In the above technical solution, the air inlet structure is set to be fixedly connected to the laser tube, and the air outlet structure is set to be fixedly connected to the annular structure, which increases the matching area of ​​the fixed connection in the laser welding nozzle, thereby improving the reliability and convenience of the laser welding nozzle. At the same time, it is also convenient for assembly.

[0017] In some embodiments, the outer circumference of the air inlet structure is threadedly matched with the inner circumference of the annular structure, or the inner circumference of the air outlet structure is threadedly matched with the outer circumference of the laser tube.

[0018] In the above technical solution, assembly can be facilitated, and the problem of difficult assembly caused by two threaded matching areas can be reduced.

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

[0020] In the above technical solution, the one-piece connection strength is higher, so the reliability of the laser welding nozzle can be further improved.

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

[0022] In the above technical solution, the air inlet structure is set to be fixedly connected to the annular structure, and the air outlet structure is set to be fixedly connected to the laser tube, which can increase the matching area of ​​the fixed connection in the laser welding nozzle, thereby improving the reliability and convenience of the laser welding nozzle. At the same time, it is also convenient for assembly.

[0023] In some embodiments, the inner circumference of the air inlet structure is threadedly matched with the outer circumference of the laser tube, or the outer circumference of the air outlet structure is threadedly matched with the inner circumference of the annular structure.

[0024] In the above technical solution, assembly can be facilitated, and the problem of difficult assembly caused by two threaded matching areas can be reduced.

[0025] In some embodiments, the air inlet 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 circumference of the air outlet structure is threadedly matched with the outer circumference of the laser tube, and / or the outer circumference of the air outlet structure is threadedly matched with the inner circumference of the annular structure.

[0026] In the above technical solution, a fixedly connected matching area is added in the laser welding nozzle, thereby improving the reliability and convenience of the laser welding nozzle. At the same time, it is also convenient for assembly.

[0027] In some embodiments, the air outlet structure is fixedly connected to the laser tube and to the annular structure, and the air inlet structure can reciprocate between different positions in the extension direction of the laser tube; the inner circumference of the air inlet structure is threadedly matched with the outer circumference of the laser tube, and / or the outer circumference of the air inlet structure is threadedly matched with the inner circumference of the annular structure.

[0028] In the above technical solution, a fixedly connected matching area is added in the laser welding nozzle, thereby improving the reliability and convenience of the laser welding nozzle. At the same time, it is also convenient for assembly.

[0029] In a second aspect, an embodiment of the present application further provides a laser welding device, comprising the above-mentioned laser welding nozzle, a shielding gas supply component and a laser emission component. The shielding gas supply component is connected to the air inlet and is used to provide shielding gas to the air inlet. The laser emission component is connected to the laser channel and is used to emit laser to the laser channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

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

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

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

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

[0035] Figure 5 A schematic structural diagram of the gas outlet structure and the ring structure in the laser welding nozzle provided in some embodiments of the present application.

[0036] The reference numerals of 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 hole;

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

[0041] 4. Ring structure;

[0042] 5. Adjust the cavity. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

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

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0049] The term "plurality" used in the present application refers to two or more (including two).

[0050] The laser welding nozzle is an important component used in the welding process, which has a shielding gas channel and a laser channel. Generally, the shielding gas channel on the laser welding nozzle cannot be turned on or off, so it is inconvenient to use.

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

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

[0053] like Figure 1 and Figure 2 As shown, the present application also provides a laser welding nozzle 200, which includes a laser tube 1, an air intake structure 2, an air outlet structure 3 and an annular structure 4. The pipeline of the laser tube 1 is a laser channel 11. The air intake structure 2 is arranged around the laser tube 1 and is provided with an air intake hole 21 that penetrates the laser tube 1. The inner circumference of the air intake structure 2 is engaged with the outer circumference of the laser tube 1. The air outlet structure 3 is arranged around the laser tube 1 and is provided with an air outlet hole 31 that penetrates the laser tube 1. The air intake structure 2 and the air outlet structure 3 are arranged along the extension direction of the laser tube 1. One of the air intake 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 arranged around the air intake structure 2 and the air outlet structure 3. One of the air intake structure 2 and the air outlet structure 3 is connected to the annular structure 4, and the other is against the inner circumference 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 close to the air outlet structure 3, the surface of the air outlet structure 3 close to the air inlet structure 2, the outer circumference of the laser tube 1 and the inner circumference of the annular structure 4 are surrounded to form an adjustment cavity 5, and the air inlet hole 21 and the air outlet hole 31 are both connected to the adjustment cavity 5; in the second state, the air inlet structure 2 and the air outlet structure 3 are 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 conversion between the first state and the second state is achieved by reciprocating the air inlet structure 2 or the air outlet structure 3 between different positions in the extension direction of the laser tube 1.

[0055] Exemplarily, the laser tube 1 is a straight tube, and the laser channel 11 is a straight channel.

[0056] The air intake structure 2 of this embodiment is arranged around the laser tube 1 and is provided with an air intake hole 21. The inner circumference of the air intake structure 2 is joined with the outer circumference of the laser tube 1, that is, the air intake structure 2 includes an annular wall body, and the air intake hole 21 is arranged through the annular wall body. Joining means that the inner circumference of the air intake structure 2 is in contact with the outer circumference of the laser tube 1, and the two can be arranged in a close fit, or threaded, or integrally formed, etc.

[0057] Exemplarily, the air inlet hole 21 may be a straight hole or an inclined hole. Optionally, there are two air inlet holes 21 , which are respectively disposed on both sides of the laser tube 1 .

[0058] The gas outlet structure 3 of this embodiment is arranged in an annular manner on the laser tube 1 and is provided with a gas outlet hole 31 penetrating through the structure, that is, the gas outlet structure 3 is an annular wall body, and the gas outlet hole 31 is arranged through the annular wall body. The gas outlet hole 31 can be a straight hole, or a hole inclined toward the laser tube 1 or a hole inclined away from the laser tube 1. The inner circumference of the gas outlet structure 3 of this embodiment can be joined with the outer circumference of the laser tube 1, or there can be a gap. Among them, the joining setting refers to contact matching, and the two can be fitted, or threaded, 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 be moved relative to the laser tube 1, such as welding, or it can be connected but movable relative to the laser tube 1, such as connected in a threaded manner.

[0060] In this embodiment, the other of the air inlet structure 2 and the air outlet structure 3 can reciprocate between different positions in the extension direction of the laser tube 1, which means that the air inlet 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] The annular structure 4 of the present embodiment is arranged on the air intake structure 2 and the air outlet structure 3, and one of the air intake structure 2 and the air outlet structure 3 is connected to the annular structure 4, which 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, which can be a fixed connection, such as welding, or can be connected by threaded fitting or other methods.

[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 to remain relatively still when not moving, and / or, one of the air intake structure 2 and the air outlet structure 3 that abuts against the inner circumference of the annular structure 4 is connected to the annular structure 4 to remain relatively still when not moving.

[0063] Exemplarily, the air inlet structure 2 or the air outlet structure 3 can be connected to the outer circumference of the laser tube 1 through a large friction damping, for example, the surfaces of the two that are in contact with each other are friction surfaces with a large friction force, and the friction force is used to keep them relatively still. When movement is required, force is used to overcome the friction force to achieve reciprocating movement. Exemplarily, the air inlet structure 2 or the air outlet structure 3 can be connected to the inner circumference of the annular structure 4 through friction damping.

[0064] Exemplarily, the laser tube 1 may be provided with a plurality of slots in the extension direction, and the air inlet structure 2 or the air outlet structure 3 may be provided with a retractable protrusion structure that cooperates with the slots, and the two opposite surfaces of the slots in the extension direction of the laser tube 1 are both inclined surfaces, and the inclined surfaces guide the protrusion structure to slide in or out, and the reciprocating movement of the air inlet structure 2 or the air outlet structure 3 on the laser tube 1 is achieved through the cooperation of the slots and the protrusion structure. Of course, the slots may also be provided on the inner side of the annular structure 4. Among them, 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 is against the inner circumference of the annular structure 4, including the following situations:

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

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

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

[0069] The air inlet structure 2 can move back and forth, the air outlet structure 3 is connected to the laser tube 1 , the air inlet structure 2 abuts against the inner circumference 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 inlet structure 2 and the air outlet structure 3 are 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, which means that along the extension direction of the laser tube 1, the projection of any air inlet hole 21 on the air outlet structure 3 does not overlap with the air outlet hole 31.

[0071] The shielding gas of the air outlet 31 of this embodiment can protect the molten pool, reduce the possibility of the metal liquid in the molten pool contacting and reacting with the oxygen in the air to form deposits, and the deposits will be deposited inside the weld to form microcracks, reducing the welding strength, so the shielding gas of the air outlet 31 can improve the welding strength. For example, laser welding is used between the aluminum shell and the top cover of the battery cell. During the laser welding process, if the molten pool is not effectively protected, the aluminum liquid in the molten pool is easy to contact with the oxygen in the air to produce alumina ceramics deposited inside the weld, forming microcracks, causing the bonding strength of the aluminum shell and the top cover to decrease. In addition, during the later use process, with the multiple charge and discharge of the battery cell, the cracks in the aluminum shell expand and contract during the expansion and contraction of the aluminum shell, and grow and expand under the action of stress, which is easy to cause the risk of leakage. The shielding gas protects the molten pool and reduces the contact of air with the molten pool, thereby improving the welding strength and reducing the risk of leakage.

[0072] The laser welding nozzle 200 of the embodiment of the present application 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 be able to move back and forth between different positions in the extension direction of the laser tube 1 to adjust the distance between the air inlet structure 2 and the air outlet structure 3, that is, to adjust the size of the adjustment cavity 5 formed by the surface of the air inlet structure 2 close to the air outlet structure 3, the surface of the air outlet structure 3 close to the air inlet structure 2, the outer circumference of the laser tube 1 and the inner circumference 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 hole 21 and the air outlet hole 31 are not connected. In this way, the laser welding nozzle 200 can switch between a state in which the air inlet hole 21 and the air outlet hole 31 are connected and a state in which the air inlet hole 21 and the air outlet hole 31 are not connected, that is, switching between the first state and the second state mentioned above, to realize the switching of the air outlet hole 31, thereby improving the convenience of using the laser welding nozzle 200.

[0073] In some embodiments, one of the air inlet structure 2 and the air outlet structure 3 that can reciprocate relative to the laser tube 1 is threadedly matched with the laser tube 1, and / or one of the air inlet structure 2 and the air outlet structure 3 that abuts against the inner circumference of the annular structure 4 is threadedly matched with the annular structure 4.

[0074] The reciprocating movement is achieved by thread matching, which is convenient to operate and has high reliability.

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

[0076] The air outlet hole 31 of this embodiment is a straight hole.

[0077] With such arrangement, the shielding gas coming out of the gas outlet 31 hardly has an impact on the molten pool, and can provide good protection for the molten pool.

[0078] In some embodiments, there are multiple air outlet holes 31 , and the multiple air outlet holes 31 are arranged at intervals around the laser tube 1 .

[0079] Exemplarily, the number of the air outlet holes 31 is four, five, six, seven or eight.

[0080] The gas outlet hole 31 of this embodiment may be a circular hole or a strip-shaped hole, and the strip-shaped hole extends along the circumference direction of the laser tube 1 .

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

[0082] Optionally, the plurality of air outlet holes 31 are arranged in a ring shape and are equidistantly spaced apart.

[0083] In some embodiments, the laser tube 1 is disposed in the gas outlet hole 31 , and the side wall of the gas outlet hole 31 and the outer peripheral surface of the laser tube 1 are jointly arranged to form a cavity for gas outlet.

[0084] Exemplarily, the laser tube 1 is located at the center of the gas outlet hole 31 , and the side wall of the gas outlet hole 31 and the outer peripheral surface of the laser tube 1 are together arranged to form an annular cavity.

[0085] Such an arrangement can provide protection for most or even the entire circumference of the emitted laser, further reducing the contact of air with the molten pool.

[0086] Figure 3 A schematic diagram of the structure of a laser tube and an air intake structure in a laser welding nozzle provided in some embodiments of the present application; Figure 4 for Figure 3 The schematic diagram of the structure of the laser tube and the air intake structure shown in another angle; Figure 5 A schematic structural diagram of the gas outlet structure and the ring structure in the laser welding nozzle provided in some embodiments of the present application.

[0087] See also Figure 2-Figure 5 In some embodiments, the air inlet structure 2 is fixedly connected to the laser tube 1 and abuts against the inner circumference 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 circumference 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] The air outlet structure 3 of this embodiment is fixedly connected to the inner circumference of the annular structure 4. The air outlet structure 3 and the annular structure 4 can be fixedly connected by welding or bonding.

[0090] The outer circumference of the air inlet structure 2 of this embodiment can be a smooth surface, which fits with the annular structure 4, and the air inlet structure 2 can also be threadedly matched with the annular structure 4. The inner circumference of the air outlet structure 3 of this embodiment can be a smooth surface, which fits with the laser tube 1, and the air outlet structure 3 can also be threadedly matched with the laser tube 1. However, at least one of the air inlet structure 2 and the air outlet structure 3 needs to be connected to the corresponding component to remain relatively still when not moving.

[0091] The air inlet structure 2 is arranged to be fixedly connected to the laser tube 1, and the air outlet structure 3 is arranged to be fixedly connected to the annular structure 4, thereby increasing the matching area of ​​the fixed connection in the laser welding nozzle 200, thereby improving the reliability and convenience of the use of the laser welding nozzle 200. At the same time, it is also convenient for assembly.

[0092] In some embodiments, the outer circumference of the air inlet structure 2 is threadedly matched with the inner circumference of the annular structure 4 , or the inner circumference of the air outlet structure 3 is threadedly matched with the outer circumference of the laser tube 1 .

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

[0095] Such an arrangement can facilitate assembly and reduce the problem of difficult assembly caused by two thread matching areas.

[0096] In some embodiments, the air inlet 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 has a higher connection strength, thus further improving the reliability of the laser welding nozzle 200 .

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

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

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

[0101] The inner circumference of the air inlet structure 2 of this embodiment and the outer circumference of the laser tube 1 can be smooth surfaces and fit together, or can be threaded. The outer circumference of the air outlet structure 3 of this embodiment and the inner circumference of the annular structure 4 can be smooth surfaces and fit together, or can be threaded. However, at least one of the air inlet structure 2 and the air outlet structure 3 needs to be connected to the corresponding component to keep relatively still when not moving.

[0102] The air inlet structure 2 is arranged to be fixedly connected to the annular structure 4, and the air outlet structure 3 is arranged to be fixedly connected to the laser tube 1, so that the matching area of ​​the fixed connection in the laser welding nozzle 200 can be increased, thereby improving the reliability and convenience of the use of the laser welding nozzle 200. At the same time, it is also convenient for assembly.

[0103] In some embodiments, the inner circumference of the air inlet structure 2 is threadedly matched with the outer circumference of the laser tube 1 , or the outer circumference of the air outlet structure 3 is threadedly matched with the inner circumference of the annular structure 4 .

[0104] Such an arrangement can facilitate assembly and reduce the problem of difficult assembly caused by two thread matching areas.

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

[0106] In some embodiments, the air inlet 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 circumference of the air outlet structure 3 is threadedly matched with the outer circumference of the laser tube 1, and / or the outer circumference of the air outlet structure 3 is threadedly matched with the inner circumference of the annular structure 4.

[0107] The inner circumference of the air intake structure 2 of this embodiment is fixedly connected to the outer circumference of the laser tube 1, which can be connected by welding or integral molding. The outer circumference of the air intake structure 2 of this embodiment is fixedly connected to the inner circumference of the annular structure 4, which can be connected by welding or integral molding.

[0108] Such arrangement increases the matching area of ​​the fixed connection in the laser welding nozzle 200, thereby improving the reliability and convenience of the use of the laser welding nozzle 200. At the same time, it is also convenient for assembly.

[0109] In some embodiments, the air outlet structure 3 is fixedly connected to the laser tube 1 and to the annular structure 4, and the air inlet structure 2 can reciprocate between different positions in the extension direction of the laser tube 1; the inner circumference of the air inlet structure 2 is threadedly matched with the outer circumference of the laser tube 1, and / or the outer circumference of the air inlet structure 2 is threadedly matched with the inner circumference of the annular structure 4.

[0110] The inner circumference of the outlet structure 3 of this embodiment is fixedly connected to the outer circumference of the laser tube 1, which can be connected by welding or integral molding. The outer circumference of the outlet structure 3 of this embodiment is fixedly connected to the inner circumference of the annular structure 4, which can be connected by welding or integral molding.

[0111] Such arrangement increases the matching area of ​​the fixed connection in the laser welding nozzle 200, thereby improving the reliability and convenience of the use of the laser welding nozzle 200. At the same time, it is also convenient for assembly.

[0112] In a second aspect, the embodiment of the present application further provides a laser welding device, comprising the above-mentioned laser welding nozzle 200, a shielding gas supply component and a laser emission component, wherein the shielding gas supply component is connected to the air inlet 21 and is used to provide shielding gas to the air inlet 21. The laser emission component is connected to the laser channel 11 and is used to emit laser to the laser channel 11.

[0113] Exemplarily, the shielding gas supply assembly includes a shielding gas cylinder.

[0114] Illustratively, the laser emitting assembly includes a laser.

[0115] See also Figure 2-Figure 5The embodiment of the present application provides a laser welding nozzle 200, which includes a laser tube 1, an air intake structure 2, an air outlet structure 3 and an annular structure 4. The pipeline of the laser tube 1 is a laser channel 11. The air intake structure 2 is sleeved outside the laser tube 1 and is provided with an air intake hole 21 that runs through it. The air outlet structure 3 is sleeved outside the laser tube 1 and is provided with an air outlet hole 31 that runs through it. The air intake structure 2 and the air outlet structure 3 are arranged along the extension direction of the laser tube 1. One of the air intake 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 sleeved on the air intake structure 2 and the air outlet structure 3. One of the air intake structure 2 and the air outlet structure 3 is connected to the annular structure 4, and the other is against the inner circumference 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 close to the air outlet structure 3, the surface of the air outlet structure 3 close to the air inlet structure 2, the outer circumference of the laser tube 1 and the inner circumference of the annular structure 4 are surrounded to form an adjustment cavity 5, and the air inlet hole 21 and the air outlet hole 31 are both connected to the adjustment cavity 5; in the second state, the air inlet structure 2 and the air outlet structure 3 are 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, and multiple air outlet holes 31 are arranged at intervals around the laser tube 1. The air inlet structure 2 is fixedly connected to the laser tube 1 and against the inner circumference 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 circumference of the air outlet structure 3 is threadedly matched with the outer circumference of the laser tube 1.

[0116] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements 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 the present 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 is provided with an air intake hole penetrating the air intake structure, wherein the inner circumference of the air intake structure is connected with the outer circumference of the laser tube; An air outlet structure is annularly arranged on the laser tube and is provided with an air outlet hole penetrating the structure. The air inlet structure and the air outlet structure are arranged along the extension direction of the laser tube. One of the air inlet structure and the air outlet structure is connected to the laser tube, and the other can reciprocate between different positions in the extension direction of the laser tube. The annular structure is arranged around the air inlet structure and the air outlet structure, one of the air inlet structure and the air outlet structure is connected to the annular structure, and the other one is against the inner circumference of the annular structure.

2. The laser welding nozzle according to claim 1, characterized in that: The one of the air inlet structure and the air outlet structure that can reciprocate relative to the laser tube is threadedly matched with the laser tube, and / or the one of the air inlet structure and the air outlet structure that abuts against the inner circumference of the annular structure is threadedly matched with the annular structure.

3. The laser welding nozzle according to claim 1, characterized in that: The extending direction of the air outlet is parallel to the extending direction of the laser tube.

4. The laser welding nozzle according to claim 3, characterized in that: There are multiple air outlet holes, and the multiple air outlet holes are arranged at intervals around the laser tube.

5. The laser welding nozzle according to claim 1, characterized in that: The laser tube is arranged in the gas outlet hole, and the side wall of the gas outlet hole and the outer peripheral surface of the laser tube are jointly arranged to form a cavity for gas outlet.

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

7. The laser welding nozzle according to claim 6, characterized in that: The outer circumference of the air inlet structure is threadedly matched with the inner circumference of the annular structure, or the inner circumference of the air outlet structure is threadedly matched with the outer circumference of the laser tube.

8. The laser welding nozzle according to claim 7, characterized in that: The air inlet 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 inlet structure can reciprocate between different positions in the extension direction of the laser tube and is fixedly connected to the inner circumference of the annular structure. The air outlet structure is fixedly connected to the laser tube and abuts against the inner circumference of the annular structure.

10. The laser welding nozzle according to claim 9, characterized in that: The inner circumference of the air inlet structure is threadedly matched with the outer circumference of the laser tube, or the outer circumference of the air outlet structure is threadedly matched with the inner circumference of the annular structure.

11. The laser welding nozzle according to claim 1, characterized in that: The air inlet 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 circumference of the gas outlet structure is threadedly matched with the outer circumference of the laser tube, and / or the outer circumference of the gas outlet structure is threadedly matched with the inner circumference 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 circumference of the air intake structure is threadedly matched with the outer circumference of the laser tube, and / or the outer circumference of the air intake structure is threadedly matched with the inner circumference of the annular structure.

13. A laser welding device, characterized in that: include: The laser welding nozzle according to any one of claims 1 to 12; A protective gas supply component is communicated with the air inlet and is used to provide protective gas to the air inlet; as well as The laser emitting assembly is connected to the laser channel and is used for emitting laser to the laser channel.

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