Laser nozzle and laser welding module of power battery module

Abstract

The utility model discloses a laser nozzle and a laser welding module of a power battery module, and relates to the field of laser welding, the laser nozzle comprises a laser nozzle, the laser nozzle is provided with a laser channel penetrating up and down, and the left and right opposite sides of the laser nozzle are respectively provided with a dust suction port and a smoke dust overflow port. And the dust suction port and the smoke dust overflow port are communicated with the laser channel. The laser welding device has the advantages that negative pressure generated in the laser channel due to dust removal is reduced through the smoke dust overflow port, and when the dust removal wind speed is insufficient, plasma smoke dust generated in the welding process can overflow from the smoke dust overflow port, so that the risk of insufficient welding is reduced.

Description

Technical Field

[0001] This utility model relates to the field of laser welding, and in particular to a laser welding module for a laser nozzle and a power battery module. Background Technology

[0002] With the development of the electric vehicle industry, the yield rate and aesthetics of the laser welding busbar process for power battery modules are particularly important. The main factors affecting the welding process, besides the quality of the laser equipment, are the structure of the welding module. The welding module includes the mounting mechanism and the copper nozzle. For example, the patent document with announcement number CN219818436U discloses a laser welding copper nozzle and laser welding device, which includes a copper nozzle body, a dust extraction hood and a dust extraction pipe. The dust extraction hood is connected to the copper nozzle body, and the dust extraction hood is provided with a dust extraction channel. The dust extraction pipe is connected to the dust extraction channel and the smoke and dust are extracted by negative pressure. The existing welding modules have the following disadvantages: (1) The dust removal effect is relatively dependent on the dust removal wind speed. When the dust removal wind speed is insufficient, the smoke and dust will affect the laser passage, resulting in poor welding of the busbar; (2) The electrode and the busbar often have tolerance due to poor flatness. The existing welding modules cannot make the electrode and the battery plate fit tightly, resulting in poor welding of the busbar; (3) The gap size between the copper nozzles is fixed. When applied to different specifications of battery cells, it is necessary to change the type, which is inefficient and costly. Utility Model Content

[0003] The technical problem to be solved by this utility model is how to optimize the welding module in terms of structure so that it will not have poor welding when the dust removal wind speed is insufficient.

[0004] This utility model solves the above-mentioned technical problems through the following technical means: a laser nozzle, wherein the laser nozzle (5) is provided with a laser channel (51) that runs through the upper and lower parts, and a dust suction port (52) and a smoke overflow port (53) are respectively provided on the left and right opposite sides of the laser nozzle (5), and the dust suction port (52) and the smoke overflow port (53) are both connected to the laser channel (51).

[0005] During the welding process, the dust removal equipment removes dust through the dust suction port. The fume overflow port reduces the negative pressure generated in the laser channel due to dust removal. Furthermore, when the dust removal air velocity is insufficient, the plasma fumes generated during the welding process can overflow from the fume overflow port, reducing the risk of incomplete welding.

[0006] As an optimized technical solution, the side wall of the laser nozzle (5) is also provided with a protective gas inlet (54) that connects to the laser channel (51).

[0007] Introducing protective gas into the laser channel through the protective gas inlet helps eliminate the negative pressure generated in the laser channel due to dust removal and prevents rapid oxidation caused by air contact with the molten pool area, thus ensuring welding effect, reducing welding defects, and making the weld bright with obvious fish scale pattern.

[0008] As an optimized technical solution, the dust suction port (52) and the smoke overflow port (53) are located on the left and right long sides of the cross-section of the laser nozzle (5), respectively, and the protective gas inlet (54) is located on the short side of the cross-section of the laser nozzle (5).

[0009] The placement of the dust suction port and smoke overflow port on the long side of the laser nozzle increases the dust suction area and improves the dust removal effect. The placement of the protective air inlet on the short side of the laser nozzle improves the blowing quality and ensures that the protective airflow can be evenly distributed around the laser nozzle.

[0010] As an optimized technical solution, the laser nozzle (5) mentioned above is included, as well as a mounting base (6) and a rigid spring (7). The mounting base (6) is provided with a through hole running vertically through the laser nozzle (5) and the mounting base (6) is connected to the mounting base (6) through the rigid spring (7).

[0011] The flexible connection between the laser nozzle and the mounting base can absorb the tolerance caused by poor flatness of the electrode and the busbar. The laser nozzle can tilt with the change of electrode flatness within a small range, so that the electrode and the battery can fit tightly, avoid poor soldering, and improve the overall welding quality of the battery cell module.

[0012] As an optimized technical solution, the laser welding module of the power battery module also includes a mounting motherboard (1), a first adapter plate (2), a second adapter plate (3), and a baffle (4). The mounting motherboard (1) is provided with a rectangular laser through hole (111) that runs vertically through the body. The first adapter plate (2) is fixedly connected to one side of the bottom of the mounting motherboard (1), and the second adapter plate (3) is fixedly connected to the other side of the bottom of the mounting motherboard (1). The baffle (4) is disposed between the first adapter plate (2) and the second adapter plate (3) and is fixedly connected to the mounting motherboard (1). Laser nozzles (5) are installed at the bottom of both the first adapter plate (2) and the second adapter plate (3).

[0013] In use, the laser passes through the laser through hole and the laser channel to weld the electrode and the electrode plate. The baffle is used to block the laser in the middle part. The structure is simple and easy to install and manufacture.

[0014] As an optimized technical solution, the second adapter plate (3) is provided with a waist-shaped hole (31), and the mounting main plate (1) is provided with a plurality of adjustment holes (112) arranged in the left and right directions corresponding to the waist-shaped hole (31).

[0015] The second adapter plate can be easily and quickly fixed by bolting through the waist-shaped hole and the adjustment hole. The second adapter plate can be adjusted left and right to adjust the gap between the two laser nozzles, thus making it compatible with different specifications of battery cells, reducing the need for replacement, improving efficiency and reducing costs.

[0016] As an optimized technical solution, the laser welding module of the power battery module also includes an adjustment mechanism (8). The adjustment mechanism (8) includes a first adjustment block (81), a second adjustment block (82), and an adjustment bolt (83). The first adjustment block (81) is fixedly connected to the mounting main board (1), the second adjustment block (82) is fixedly connected to the second adapter plate (3), and the adjustment bolt (83) is rotatably connected to the first adjustment block (81) and threadedly connected to the second adjustment block (82).

[0017] The second adapter plate can be easily moved left and right by rotating the adjusting bolt.

[0018] As an optimized technical solution, a scale (9) is fixedly connected to the second adapter plate (3), and the mounting main plate (1) is provided with a scale.

[0019] The position of the second adapter board can be recorded by the corresponding scale mark when it is applied to different specifications of battery cells, which facilitates quick adjustment of the second adapter board.

[0020] As an optimized technical solution, the mounting motherboard (1) includes a first fixing plate (11) and a second fixing plate (12), wherein the second fixing plate (12) is perpendicular to the first fixing plate (11) and is fixedly connected to the first fixing plate (11).

[0021] It facilitates connection to a servo arm.

[0022] As an optimized technical solution, a reinforcing rib (13) is fixedly connected between the first fixing plate (11) and the second fixing plate (12).

[0023] It improved the structural strength. Attached Figure Description

[0024] Figure 1 This is a first-angle isometric view of the laser welding module of the power battery module in an embodiment of this utility model.

[0025] Figure 2 This is a second-angle isometric view of the laser welding module of the power battery module in an embodiment of this utility model.

[0026] Figure 3 This is an isometric view of the first fixing plate in an embodiment of the present invention.

[0027] Figure 4 This is an isometric view of the first adapter plate in an embodiment of the present invention.

[0028] Figure 5 This is an isometric schematic diagram of the second adapter plate according to an embodiment of the present invention.

[0029] Figure 6 This is an isometric view of the laser nozzle according to an embodiment of the present invention.

[0030] Figure 7 This is an isometric view of the mounting base and rigid spring in an embodiment of this utility model.

[0031] In the attached diagrams above, 1-Main board mounting, 11-First fixing plate, 111-Laser through hole, 112-Adjustment hole, 12-Second fixing plate, 13-Reinforcing rib; 2-First adapter plate; 3-Second adapter plate, 31-Oval hole; 4-Baffle; 5-Laser nozzle, 51-Laser channel, 52-Dust suction port, 53-Smoke overflow port, 54-Protective gas inlet; 6-Mounting base; 7-Hard spring; 8-Adjustment mechanism, 81-First adjusting block; 82-Second adjusting block; 83-Adjusting bolt, 9-Scale. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] like Figures 1 to 7 As shown in the figure, this utility model embodiment discloses a laser welding module for a power battery module, including a mounting motherboard 1, a first adapter plate 2, a second adapter plate 3, a baffle 4, a laser nozzle 5, a mounting base 6, an adjustment mechanism 7, and a scale 8.

[0034] The mounting motherboard 1 includes a first fixing plate 11, a second fixing plate 12, and a reinforcing rib 13; the second fixing plate 12 is perpendicular to the first fixing plate 11 and is fixedly connected to the first fixing plate 11 to facilitate the connection of the servo arm; the first fixing plate 11 and the second fixing plate 12 are fixedly connected by the reinforcing rib 13 to improve the structural strength.

[0035] The first fixed plate 11 has a rectangular laser passage hole 111 running vertically through it. The first adapter plate 2 is fixedly connected to one side of the bottom of the first fixed plate 11 by bolts. The second adapter plate 3 is fixedly connected to the other side of the bottom of the first fixed plate 11 by bolts and can be adjusted left and right. The baffle 4 is set between the first adapter plate 2 and the second adapter plate 3 and is fixedly connected to the mounting main plate 1 by bolts. The bottom of the first adapter plate 2 and the second adapter plate 3 are both fixedly connected to the mounting base 6 by bolts. A copper laser nozzle 5 is installed at the bottom of each mounting base 6. The first adapter plate 2 and the second adapter plate 3 are both C-shaped structures. The C-shaped openings of the two are respectively connected to the laser passage hole 111 to allow the laser to pass through. The baffle 4 is used to block the laser in the middle part. The second adapter plate 3 can be adjusted left and right so that the gap between the two laser nozzles 5 can be adjusted, thereby being compatible with different specifications of battery cells, reducing the need for replacement, improving efficiency, and reducing costs.

[0036] The second adapter plate 3 has waist-shaped holes 31 on both the front and rear sides. The front and rear sides of the main board 1 are provided with multiple adjustment holes 112 arranged in the left and right direction, corresponding to the waist-shaped holes 31. The position of the second adapter plate 3 can be easily and quickly fixed by bolting through the waist-shaped holes 31 and the adjustment holes 112.

[0037] The laser nozzle 5 has a vertically penetrating laser channel 51. On the left and right opposite sides of the laser nozzle 5, there are dust suction ports 52 and fume overflow ports 53, which are connected to the laser channel 51. During the welding process, the dust removal equipment removes dust through the dust suction port 52. The fume overflow port 53 reduces the negative pressure generated in the laser channel 51 due to dust removal. Furthermore, when the dust removal air velocity is insufficient, the plasma fumes generated during the welding process can overflow from the fume overflow port 53, reducing the risk of poor welding.

[0038] The side wall of the laser nozzle 5 is also provided with a protective gas inlet 54 that connects to the laser channel 51. The introduction of protective gas into the laser channel 51 through the protective gas inlet 54 helps to eliminate the negative pressure generated in the laser channel 51 due to dust removal, and prevents air from contacting the molten pool area and causing rapid oxidation, thus ensuring the welding effect, reducing welding defects, making the weld bright and the fish scale pattern obvious.

[0039] The dust suction port 52 and the smoke overflow port 53 are located on the left and right long sides of the cross-section of the laser nozzle 5, respectively, and the protective gas inlet 54 is located on the front short side of the cross-section of the laser nozzle 5. Compared with the existing copper nozzle, the way the dust suction port 52 and the smoke overflow port 53 are located on the long side of the laser nozzle 5 increases the dust suction area and improves the dust removal effect. The way the protective gas inlet 54 is located on the short side of the laser nozzle 5 improves the blowing quality and ensures that the protective gas flow can be evenly distributed around the laser nozzle 5.

[0040] Both the upper and lower channels of laser channel 51 are expansion channel structures. The cross-sectional size of the upper channel is larger than that of the lower channel, which increases the area available for welding and the space for fume diffusion.

[0041] Mounting base 6 has a through hole running vertically through it. The front and rear ends of laser nozzle 5 are connected to mounting base 6 by hard springs 7. This elastic connection method can absorb the tolerance of poor flatness between the electrode post and the busbar. Laser nozzle 5 can tilt with the change of electrode post flatness within a small range, so that the electrode post and the battery can fit tightly, avoid poor soldering, and improve the overall welding quality of the battery cell module.

[0042] The adjustment mechanism 8 includes a first adjustment block 81, a second adjustment block 82, and an adjustment bolt 83. The first adjustment block 81 is fixedly connected to the bottom of the first fixed plate 11, the second adjustment block 82 is fixedly connected to the bottom of the second adapter plate 3, and the adjustment bolt 83 is rotatably connected to the first adjustment block 81 and threadedly connected to the second adjustment block 82. The second adapter plate 3 can be easily adjusted to move left and right by rotating the adjustment bolt 83.

[0043] A scale 9 is fixedly connected to the second adapter plate 3, and a scale is provided on the first fixed plate 11. The specific position of the second adapter plate 3 when applied to different specifications of battery cells can be recorded by the position of the scale corresponding to the scale 9, which facilitates the quick adjustment of the second adapter plate 3.

[0044] Working principle: In use, the second fixing plate 12 is fixedly connected to the servo arm. The servo arm moves the two laser nozzles 5 to the welding position of the battery cell module, and the electrode and the plate are tightly attached. Then the laser equipment is started. The laser passes through the laser through hole 111, the through hole on the mounting base 6 and the laser channel 51 in sequence to weld the electrode and the plate. During the welding process, the dust removal equipment removes dust through the dust suction port 52. At the same time, protective gas is introduced into the laser channel 51 through the protective gas inlet 54. When the dust removal wind speed is insufficient, the plasma fume can overflow from the fume overflow port 53, reducing the risk of poor welding and ensuring the welding effect.

[0045] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such 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 utility model.

Claims

1. A laser nozzle, characterized in that: The laser nozzle has a laser channel that runs vertically through it. On the left and right opposite sides of the laser nozzle, there are a dust suction port and a smoke overflow port, respectively. Both the dust suction port and the smoke overflow port are connected to the laser channel.

2. The laser nozzle according to claim 1, characterized in that: The side wall of the laser nozzle is also provided with a protective gas inlet that connects to the laser channel.

3. The laser nozzle according to claim 2, characterized in that: The dust suction port and the smoke overflow port are located on the left and right long sides of the cross-section of the laser nozzle, respectively, and the protective gas inlet is located on the short side of the cross-section of the laser nozzle.

4. A laser welding module for a power battery module, characterized in that: The laser nozzle according to any one of claims 1-3 further includes a mounting base and a rigid spring, wherein the mounting base has a through hole extending vertically, and the laser nozzle is connected to the mounting base via the rigid spring.

5. The laser welding module for a power battery module according to claim 4, characterized in that: The laser welding module for the power battery module also includes a mounting motherboard, a first adapter plate, a second adapter plate, and a baffle. The mounting motherboard has a rectangular laser through hole running vertically through the top and bottom. The first adapter plate is fixedly connected to one side of the bottom of the mounting motherboard, and the second adapter plate is fixedly connected to the other side of the bottom of the mounting motherboard. The baffle is disposed between the first adapter plate and the second adapter plate and is fixedly connected to the mounting motherboard. Laser nozzles are installed at the bottom of both the first adapter plate and the second adapter plate.

6. The laser welding module for a power battery module according to claim 5, characterized in that: The second adapter board has an oblong hole, and the mounting motherboard has multiple adjustment holes arranged in the left-right direction corresponding to the oblong hole.

7. The laser welding module for a power battery module according to claim 5, characterized in that: The laser welding module of the power battery module also includes an adjustment mechanism, which includes a first adjustment block, a second adjustment block, and an adjustment bolt. The first adjustment block is fixedly connected to the mounting main board, the second adjustment block is fixedly connected to the second adapter plate, and the adjustment bolt is rotatably connected to the first adjustment block and threadedly connected to the second adjustment block.

8. The laser welding module for a power battery module according to claim 5, characterized in that: A ruler is fixedly connected to the second adapter plate, and the mounting motherboard is provided with graduations.

9. The laser welding module for a power battery module according to claim 5, characterized in that: The mounting motherboard includes a first fixing plate and a second fixing plate, wherein the second fixing plate is perpendicular to the first fixing plate and is fixedly connected to the first fixing plate.

10. The laser welding module for a power battery module according to claim 9, characterized in that: The first fixing plate and the second fixing plate are fixedly connected by reinforcing ribs.

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