Welding copper nozzle and laser welding device

Abstract

The utility model belongs to the field of laser welding, and particularly relates to a welding copper nozzle and a laser welding device.The welding copper nozzle comprises an inner copper sleeve and an outer copper sleeve, a laser channel allowing laser to penetrate is formed in the inner copper sleeve, the inner copper sleeve is coaxially sleeved with the outer copper sleeve, and a gap is formed between the inner wall of the outer copper sleeve and the outer wall of the inner copper sleeve; a plurality of annular protruding ribs are arranged on the outer wall of the inner copper sleeve at intervals in the axial direction of the inner copper sleeve, a plurality of air passing openings are formed in each annular protruding rib at intervals in the circumferential direction, and an air inlet channel communicated with the gap is formed in the end, close to the laser incidence end of the laser channel, of the outer copper sleeve. The protective gas introduced into the gap between the outer copper sleeve and the inner copper sleeve is evenly dispersed through the gas passing openings in the annular protruding ribs, finally, the protective gas is evenly exhausted from the end, close to laser emitting of the laser channel, of the gap, coaxial protection is formed for the welding portion, and the welding effect of the laser welding device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of laser welding, and in particular to a welding copper nozzle and a laser welding device. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. In the production process of batteries and battery packs, laser welding technology is used in the welding of pole pieces, bars, and top covers. When using laser welding technology for welding, a copper nozzle is installed at the end of the welding gun. A gas flow channel is provided in the copper nozzle, and protective gases such as nitrogen can be introduced to protect the welding.

[0003] The current welding copper nozzles are generally double-layer nested copper nozzle structures. The gap between the inner and outer copper nozzles forms a gas flow channel. Since the surfaces of the outer wall of the inner copper nozzle and the inner wall of the outer copper nozzle are both smooth conical surfaces, the shielding gas introduced is output unevenly between the inner and outer copper nozzles, affecting the laser welding effect. Utility Model Content

[0004] The embodiments of the present application provide a welding copper nozzle and a laser welding device, which aim to improve the uniformity of the output of the shielding gas from the copper nozzle and improve the laser welding effect.

[0005] To this end, according to one aspect of the present application, a welding copper nozzle is provided, comprising an inner copper sleeve and an outer copper sleeve, wherein a laser channel for laser penetration is formed inside the inner copper sleeve, the outer copper sleeve is coaxially sleeved on the inner copper sleeve, a gap is provided between the inner wall of the outer copper sleeve and the outer wall of the inner copper sleeve, a plurality of annular ribs are provided on the outer wall of the inner copper sleeve at axial intervals along the inner copper sleeve, a plurality of air notches are provided on each of the annular ribs at circumferential intervals, and an air inlet channel connected to the gap is provided at one end of the outer copper sleeve close to the laser channel for incident laser.

[0006] Optionally, a plurality of the annular convex ribs are arranged at equal intervals along the axial direction of the inner copper sleeve; and a plurality of the air passage notches are evenly arranged along the circumferential direction on each of the annular convex ribs.

[0007] Optionally, the air passage notches on two adjacent annular convex ribs are staggered in the axial direction of the inner copper sleeve.

[0008] Optionally, the air inlet passage has an air inlet for introducing protective gas and an air outlet communicating with the gap, and the air outlet is tangent to the inner wall of the outer copper sleeve.

[0009] Optionally, there is a gap of 0.1 mm-0.15 mm between the annular rib and the inner wall of the outer copper sleeve.

[0010] Optionally, at one end of the laser channel where the laser is emitted, the outer copper sleeve is 5 mm to 8 mm longer than the inner copper sleeve.

[0011] Optionally, the inner copper sleeve and the outer copper sleeve are both conical, and the laser enters from the large end of the inner copper sleeve and exits from the small end of the inner copper sleeve. The number of the air notches on the annular rib gradually increases from the large end of the inner copper sleeve to the small end of the inner copper sleeve.

[0012] Optionally, the welding copper nozzle also includes a fixing component, which includes a first wing plate, a second wing plate and a fastener, the first wing plate is connected to an end of the inner copper sleeve close to the laser channel where the laser is incident, the second wing plate is connected to an end of the outer copper sleeve close to the laser channel where the laser is incident, the air inlet channel is arranged on the second wing plate, and the first wing plate and the second wing plate are locked by the fastener.

[0013] Optionally, the second wing plate is provided with a mounting groove adapted to the shape of the first wing plate, and the first wing plate is embedded in the mounting groove and locked with the second wing plate by the fastener.

[0014] According to another aspect of the present application, a laser welding device is provided, comprising a welding gun and the welding copper nozzle as described above.

[0015] The welding copper nozzle and the laser welding device provided by the present application have the beneficial effects that, compared with the prior art, the welding copper nozzle of the present application arranges a plurality of annular ribs at intervals along the axial direction of the inner copper sleeve on the outer wall of the inner copper sleeve, and each annular rib is provided with a plurality of air notches at intervals along the circumferential direction. The plurality of air notches on the plurality of annular ribs are utilized to evenly disperse the protective gas introduced into the gap between the outer copper sleeve and the inner copper sleeve, and finally the protective gas is evenly discharged from the end of the gap close to the laser channel where the laser is emitted, thereby forming coaxial protection for the welding part and improving the welding effect of the laser welding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 these drawings without paying creative work.

[0017] in:

[0018] Figure 1 It is a schematic diagram of the overall structure of a welding copper nozzle shown in one embodiment of the present application;

[0019] Figure 2 yes Figure 1The cross-sectional structural schematic diagram of the welding copper nozzle shown;

[0020] Figure 3 It is a schematic diagram of the connection between the inner copper sleeve and the first wing plate of the welding copper nozzle shown in one embodiment of the present application;

[0021] Figure 4 It is a schematic diagram of the connection between the outer copper sleeve of the welding copper nozzle and the second wing plate shown in one embodiment of the present application.

[0022] Description of main component symbols:

[0023] 10, inner copper sleeve; 101, laser channel; 110, annular rib; 111, air notch;

[0024] 20, outer copper sleeve; 201, air inlet channel; 2011, air outlet;

[0025] 30. Fixing assembly; 31. First wing plate; 32. Second wing plate; 321. Mounting groove; 322. Mounting hole; 33. Fastener. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described more comprehensively with reference to the relevant drawings below. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0031] It should also be noted that, in the embodiments of the present application, the same figure mark is used to represent the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0032] As described in the background technology, in the related technology, since the surfaces of the outer wall of the inner copper nozzle and the inner wall of the outer copper nozzle are both smooth conical surfaces, the shielding gas introduced into the gap is output unevenly between the inner and outer copper nozzles, affecting the laser welding effect.

[0033] In order to solve the above problems, according to one aspect of the present application, an embodiment of the present application provides a welding copper nozzle, such as Figure 1-Figure 2 As shown, the welding copper nozzle includes an inner copper sleeve 10 and an outer copper sleeve 20, a laser channel 101 for laser penetration is formed inside the inner copper sleeve 10, the outer copper sleeve 20 is coaxially sleeved on the inner copper sleeve 10, a gap is provided between the inner wall of the outer copper sleeve 20 and the outer wall of the inner copper sleeve 10, a plurality of annular convex ribs 110 are provided on the outer wall of the inner copper sleeve 10 at axial intervals along the inner copper sleeve 10, a plurality of air notches 111 are provided on each annular convex rib 110 at circumferential intervals, and an air inlet channel 201 connected to the gap is provided at one end of the outer copper sleeve 20 close to the laser channel 101 for incident laser.

[0034] In the embodiment of the present application, the welding copper nozzle is provided with a plurality of annular ribs 110 at axial intervals along the outer wall of the inner copper sleeve 10, and each annular rib 110 is provided with a plurality of air notches 111 at circumferential intervals. The plurality of air notches 111 on the plurality of annular ribs 110 are utilized to evenly disperse the protective gas entering the gap between the outer copper sleeve 20 and the inner copper sleeve 10, and finally the protective gas is evenly discharged from the end of the gap close to the laser channel 101 emitting the laser, thereby forming coaxial protection for the welding part and improving the welding effect.

[0035] In one embodiment, if Figure 3As shown, a plurality of annular convex ribs 110 are arranged at equal intervals along the axial direction of the inner copper sleeve 10 ; and a plurality of air passage notches 111 are uniformly arranged on each annular convex rib 110 along the circumferential direction.

[0036] By evenly arranging the annular convex ribs 110 and the gas notches 111, the dispersion capability of the protective gas introduced into the gap is further improved, and the uniformity of the output of the protective gas is improved.

[0037] Furthermore, the gas notches 111 on two adjacent annular convex ribs 110 are staggered in the axial direction of the inner copper sleeve 10 , and thus the ability to evenly disperse the protective gas in the gap is also improved.

[0038] In one embodiment, if Figure 1 and Figure 4 As shown, the air inlet channel 201 has an air inlet for introducing protective gas and an air outlet 2011 connected to the gap. The air outlet 2011 is tangent to the inner wall of the outer copper sleeve 20. According to this design, the protective gas introduced into the gap forms a spiral airflow, which then passes through multiple air notches 111 on multiple annular convex ribs 110 in sequence to disperse the airflow, and finally the airflow is blown out evenly.

[0039] It is understandable that the air supply channel is not limited to only one, and multiple air supply channels can be provided as needed.

[0040] In one embodiment, if Figure 2 As shown, there is a gap of 0.1mm-0.15mm (shown as d in the figure) between the annular rib 110 and the inner wall of the outer copper sleeve 20, which allows the clearance between the inner copper sleeve 10 and the outer copper sleeve 20 to fit, and the gap can also allow a small amount of airflow to flow.

[0041] At the end of the laser channel 101 where the laser is emitted, the outer copper sleeve 20 is longer than the inner copper sleeve 10 (indicated by h in the figure) by 5 mm to 8 mm.

[0042] In one embodiment, if Figure 2-Figure 3 As shown, the inner copper sleeve 10 and the outer copper sleeve 20 are both in a cone shape. The laser is injected from the large end of the inner copper sleeve 10 and then emitted from the small end of the inner copper sleeve 10. The number of the air notches 111 on the annular convex rib 110 gradually increases from the large end of the inner copper sleeve 10 to the small end of the inner copper sleeve 10, that is, the closer to the end where the laser is emitted, the denser the air notches 111 on the annular convex rib 110 are, so that the final output airflow is more uniform.

[0043] In one embodiment, if Figure 1-Figure 2As shown, the welding copper nozzle also includes a fixing component 30, which includes a first wing plate 31, a second wing plate 32 and a fastener 33. The first wing plate 31 is connected to an end of the inner copper sleeve 10 close to the laser channel 101 where the laser is incident, and the second wing plate 32 is connected to an end of the outer copper sleeve 20 close to the laser channel 101 where the laser is incident, and the air inlet channel 201 is arranged on the second wing plate 32. The first wing plate 31 and the second wing plate 32 are locked by the fastener 33.

[0044] By providing the fixing assembly 30, the inner copper sleeve 10 and the outer copper sleeve 20 can be assembled and connected, and the fixing assembly 30 can also be used as a carrier for connecting the entire welding copper nozzle to the welding gun.

[0045] Preferably, the first wing plate 31 and the inner copper sleeve 10 are an integral structure, the second wing plate 32 and the outer copper sleeve 20 are an integral structure, and the fasteners 33 may be screws.

[0046] In a specific embodiment, Figure 1 and Figure 4 As shown, the second wing plate 32 is provided with a mounting groove 321 which is adapted to the shape of the first wing plate 31 , and the first wing plate 31 is embedded in the mounting groove 321 and is locked with the second wing plate 32 through a fastener 33 .

[0047] The first wing plate 31 is located in the mounting groove 321 , and can play a positioning role during assembly, thereby improving the stability of the connection between the inner copper sleeve 10 and the outer copper sleeve 20 .

[0048] In addition, a plurality of mounting holes 322 are provided on the second wing plate 32 for mounting the entire welding copper nozzle on the welding gun through connecting members (such as screws).

[0049] According to another aspect of the present application, an embodiment of the present application further provides a laser welding device, comprising a welding gun and a welding copper nozzle in any of the above embodiments.

[0050] Since the laser welding device adopts the welding copper nozzle in the above embodiment, it also has the advantages and benefits brought by the above welding copper nozzle, thereby improving the welding effect of the laser welding device.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A welding copper nozzle, characterized in that: The invention comprises an inner copper sleeve and an outer copper sleeve, wherein a laser channel for laser transmission is formed inside the inner copper sleeve, the outer copper sleeve is coaxially sleeved on the inner copper sleeve, a gap is arranged between the inner wall of the outer copper sleeve and the outer wall of the inner copper sleeve, a plurality of annular ribs are arranged on the outer wall of the inner copper sleeve at intervals along the axial direction of the inner copper sleeve, a plurality of air notches are arranged on each of the annular ribs at intervals along the circumferential direction, and an air inlet channel connected to the gap is arranged at one end of the outer copper sleeve close to the laser channel for incident laser.

2. The welding copper nozzle according to claim 1, characterized in that: The plurality of annular convex ribs are arranged at equal intervals along the axial direction of the inner copper sleeve; and each of the annular convex ribs is evenly provided with a plurality of air passage notches along the circumferential direction.

3. The welding copper nozzle according to claim 1, characterized in that: The air passage notches on two adjacent annular convex ribs are staggered in the axial direction of the inner copper sleeve.

4. The welding copper nozzle according to claim 1, characterized in that: The air inlet passage comprises an air inlet for introducing protective gas and an air outlet communicated with the gap, and the air outlet is tangent to the inner wall of the outer copper sleeve.

5. The welding copper nozzle according to claim 1, characterized in that: There is a gap of 0.1mm-0.15mm between the annular convex rib and the inner wall of the outer copper sleeve.

6. The welding copper nozzle according to claim 1, characterized in that: At one end of the laser channel where the laser is emitted, the outer copper sleeve is 5 mm to 8 mm longer than the inner copper sleeve.

7. The welding copper nozzle according to any one of claims 1 to 6, characterized in that: The inner copper sleeve and the outer copper sleeve are both conical, the laser enters from the large end of the inner copper sleeve and exits from the small end of the inner copper sleeve, and the number of the air notches on the annular rib gradually increases from the large end of the inner copper sleeve to the small end of the inner copper sleeve.

8. The welding copper nozzle according to any one of claims 1 to 6, characterized in that: The welding copper nozzle also includes a fixing component, which includes a first wing plate, a second wing plate and a fastener, the first wing plate is connected to an end of the inner copper sleeve close to the laser channel where the laser is incident, the second wing plate is connected to an end of the outer copper sleeve close to the laser channel where the laser is incident, the air inlet channel is arranged on the second wing plate, and the first wing plate and the second wing plate are locked by the fastener.

9. The welding copper nozzle according to claim 8, characterized in that: The second wing plate is provided with a mounting groove matched with the shape of the first wing plate, and the first wing plate is embedded in the mounting groove and locked with the second wing plate through the fastener.

10. A laser welding device, characterized in that: The invention comprises a welding gun and a welding copper nozzle as described in any one of claims 1 to 9.

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