Self-adaptive welding head assembly for laser welding of power battery connecting piece and dust removal device

Abstract

The utility model discloses a self-adaptive welding head assembly for laser welding of a power battery connecting piece. The self-adaptive welding head assembly comprises a cover plate, an air pressure baffle and a welding cavity. The cover plate is connected to the side portion of the welding cavity, and an air pressure cavity is formed by the cover plate and the side wall of the welding cavity. The air pressure baffle is accommodated in the air pressure cavity; a dust collection channel and an air blowing channel are constructed in the welding cavity, and the air blowing channel comprises a welding channel flowing to the welding station and at least one pressurizing channel flowing to the air pressure cavity; an opening, leading to the air pressure cavity, of the pressurization channel in the welding cavity is located above the air pressure baffle, air is blown to the air pressure cavity through the pressurization channel, downward pressure can be applied to the air pressure baffle, the air pressure baffle is tightly attached to the battery cover plate, welding slag dust is effectively prevented from splashing, and a roll core is prevented from being polluted. The utility model further discloses a dust removal device comprising the self-adaptive welding head assembly.

Description

Technical Field

[0001] This utility model relates to the technical field of laser welding equipment for power battery connecting pieces, and more specifically to an adaptive welding head assembly and dust removal device for laser welding of power battery connecting pieces. Background Technology

[0002] Currently, laser welding is generally used to connect the connecting pieces of power batteries. However, the welding process generates a large amount of welding slag and dust, which often flies into the core, affecting the quality of the power battery, increasing the short circuit rate and self-discharge, and posing a significant safety risk for subsequent use.

[0003] Chinese invention patent document (application number 202310947225.7) discloses a tiered progressive dust removal device for laser welding, including a laser mounted on a support frame and a welding platform located directly below it. It also includes a dust removal component located between the welding platform and the laser, comprising a slag spatter dust removal component and a welding station dust removal component located below it. This application achieves dual dust removal by setting up both the slag spatter dust removal component and the welding station dust removal component. Furthermore, the progressive dust reduction component within the slag spatter dust removal component can decelerate the dust in stages, effectively slowing down the welding slag and increasing dust removal efficiency.

[0004] While the aforementioned technical solution improves the dust removal component for welding slag spatter, the inventors discovered that during welding, the openings of the protective gas blowing channel and the dust removal channel in the welding station dust removal component that contacts the battery cover are on the same plane. This makes it easy for the protective gas to be sucked away during welding, affecting the welding effect. Furthermore, the inventors found that because the high-temperature dust generated during welding easily adheres to the tooling, frequent brush cleaning causes wear, preventing the welding station dust removal component from fully adhering to the battery cover. This allows welding slag to splatter out from the gaps, causing contamination of the battery core. Utility Model Content

[0005] 1. Technical problem to be solved by the utility model

[0006] In view of this, the purpose of this utility model is to provide an adaptive welding head assembly and dust removal device for laser welding of power battery connecting pieces, so as to at least solve one of the above problems.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] This utility model discloses an adaptive welding head assembly for laser welding of power battery connecting pieces, comprising a cover plate, a pneumatic baffle, and a welding cavity;

[0010] The cover plate is fixedly connected to the side of the welding cavity and forms a pneumatic cavity with the side wall of the welding cavity;

[0011] The air pressure baffle is housed in the air pressure chamber and is placed on the battery cover.

[0012] The welding chamber has a dust suction channel and an air blowing channel inside. The air blowing channel includes a welding channel that flows to the welding station and at least one pressurization channel that flows to the air pressure chamber.

[0013] The dust extraction channel is used to remove welding slag and dust from the welding station;

[0014] The opening of the pressurization channel in the welding cavity leads to the air pressure chamber and is located above the air pressure baffle. By blowing air into the air pressure chamber through the pressurization channel, downward pressure can be applied to the air pressure baffle, so that the air pressure baffle is tightly fitted to the battery cover.

[0015] Furthermore, the cover plate is detachably connected to the side of the welding cavity.

[0016] Furthermore, there are two cover plates, symmetrically arranged on both sides of the welding cavity, and each of them forms a pneumatic cavity with the side wall of the welding cavity;

[0017] Each of the aforementioned air pressure chambers is provided with an air pressure baffle;

[0018] The pressurization channel consists of two channels, which are respectively connected to the air pressure chamber through the side of the welded cavity;

[0019] During welding, air is blown into the air pressure chamber through each of the pressurization channels, and the air pressure baffle applies pressure to the welding station, so that the pressure baffle is in contact with the battery cover.

[0020] Furthermore, the two pressurizing channels are symmetrical about the left and right sides with respect to the central axis of the welding cavity, and the pressure exerted by the two pressurizing channels on the two air pressure baffles is equal.

[0021] Furthermore, the air pressure baffle is provided with guide ribs, and the cover plate is provided with guide grooves at corresponding positions, the guide grooves on the cover plate being able to accommodate the guide ribs.

[0022] Furthermore, the guide rib is located at the middle position of the air pressure baffle.

[0023] Furthermore, a guide groove can be constructed on the air pressure baffle, and a guide rib can be constructed at a corresponding position on the cover plate, with the guide groove on the air pressure baffle capable of accommodating the guide rib.

[0024] Furthermore, the guide groove is located in the middle of the air pressure baffle.

[0025] Furthermore, the welding channel opening is located below the welding cavity, directly facing the welding station, and the dust extraction channel opening is located above the welding channel.

[0026] Another aspect of this utility model relates to an adaptive dust removal device for laser welding of power battery connecting pieces, including the aforementioned adaptive welding head assembly. The adaptive dust removal device also includes a gas flow pipe, which includes an air blowing pipe and a dust suction pipe. One end of the air blowing pipe is connected to an air compressor through an air blowing interface, and the other end is connected to an air blowing channel. One end of the dust suction pipe is connected to a vacuum cleaner through a dust suction pipe, and the other end is connected to a dust suction channel.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0029] (1) An adaptive welding head assembly for laser welding of power battery connecting pieces according to the present invention is located above a battery cover plate and includes a cover plate, a pressure baffle and a welding cavity; the cover plate is fixedly connected to the side of the welding cavity and forms a pressure cavity with the side wall of the welding cavity; the pressure baffle is accommodated in the pressure cavity and is placed on the battery cover plate; the welding cavity has a dust suction channel and an air blowing channel inside, the air blowing channel includes a welding channel flowing to the welding station and at least one pressurization channel flowing to the pressure cavity; the opening of the pressurization channel in the welding cavity leading to the pressure cavity is located above the side of the pressure baffle, and air is blown into the pressure cavity through the pressurization channel, which can apply downward pressure to the pressure baffle, so that the pressure baffle is tightly attached to the battery cover plate, effectively preventing welding slag and dust from splashing and avoiding contamination of the core.

[0030] (2) An adaptive welding head assembly for laser welding of power battery connecting pieces according to this utility model, wherein there are two cover plates, symmetrically arranged on both sides of the welding cavity, and each forming a pneumatic chamber with the side wall of the welding cavity; there are two pneumatic baffles, respectively arranged in the two pneumatic chambers; there are two pressurization channels, respectively connected to the pneumatic chambers through the side of the welding cavity; during welding, air is blown into the two pneumatic chambers through the two pressurization channels to apply pressure to the two pneumatic baffles, so that the two pneumatic baffles fit against the battery cover plate; the two pressurization channels are symmetrical about left and right with respect to the central axis of the welding cavity, and the pressure applied by the two pressurization channels to the two pneumatic baffles is equal; this enables the two pneumatic baffles to fit more tightly against the battery cover plate, and the effect of preventing welding slag and dust from splashing is better.

[0031] (3) An adaptive welding head assembly for laser welding of power battery connecting pieces according to the present invention, wherein the air pressure baffle is also provided with a guide rib / guide groove, and the cover plate is provided with a guide groove / guide rib at a corresponding position. The guide groove can accommodate the guide rib, so that the air pressure baffle moves up and down smoothly without causing jamming.

[0032] (4) An adaptive welding head assembly for laser welding of power battery connecting pieces according to the present invention, wherein the welding channel opening is located below the welding cavity and directly opposite the welding station, and the dust suction channel opening is located above the welding channel, so that the protective gas will not be directly sucked away when the dust suction wind speed is increased, and other gases and impurities will be prevented from contaminating and affecting the welding quality.

[0033] (5) Another aspect of this utility model relates to an adaptive dust removal device for laser welding of power battery connecting pieces, including the above-mentioned adaptive welding head assembly. The adaptive dust removal device also includes a gas flow pipe, which includes an air blowing pipe and a dust suction pipe. One end of the air blowing pipe is connected to an air compressor through an air blowing interface, and the other end is connected to an air blowing channel. One end of the dust suction pipe is connected to a vacuum cleaner through a dust suction pipe, and the other end is connected to a dust suction channel. The adaptive dust removal device generates pressure by blowing air to make the dust removal assembly at the welding station fit tightly with the battery cover to prevent welding slag from splashing, and finally the dust is sucked away by negative pressure. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a laser welding dust removal system according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of an adaptive dust removal device according to an embodiment of the present invention;

[0036] Figure 3 This is a disassembly diagram of a welding head assembly according to an embodiment of the present invention;

[0037] Figure 4 This is a top view of the mounting plate according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the internal air passage of a dust removal device according to an embodiment of the present invention;

[0039] Figure 6 This is a front view of a welding head assembly according to an embodiment of the present invention;

[0040] Figure 7 This is a top view of a welding head assembly according to an embodiment of the present invention;

[0041] Figure 8 It is along Figure 7 Sectional view of line AA in the middle;

[0042] Figure 9 It is along Figure 6 A cross-sectional view along the BB line.

[0043] The following are the labels in the schematic diagram: 1. Air blowing interface, 2. End plate, 3. Welding head assembly, 31. Cover plate, 32. Air pressure baffle, 33. Welding cavity, 331. Air pressure cavity, 332. Dust suction channel, 333. Air blowing channel, 3331. Welding channel, 3332. Pressurization channel, 34. Guide rib, 35. Guide groove, 4. Gas flow pipe, 41. Dust suction flow pipe, 42. Air blowing flow pipe, 5. Dust suction pipe, 6. Battery cover plate. Detailed Implementation

[0044] To enable those skilled in the art to better understand this technical solution, the technical solution of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and embodiments.

[0045] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the disclosed technical content. Terms such as "top and bottom," "left and right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention's implementation.

[0046] Currently, laser welding is generally used to connect power batteries and connecting plates. However, the welding process generates a large amount of welding slag and dust that flies into the workshop, causing environmental pollution. It can also enter the battery core, affecting battery quality, increasing the short-circuit rate and self-discharge of the power battery, and posing significant safety hazards. Furthermore, the high-temperature dust generated during welding easily adheres to the tooling, requiring frequent cleaning with brushes. This leads to wear on the welding tooling, preventing the dust removal components from fitting tightly against the battery cover. Welding slag and dust can then splash out from the gaps between the dust removal components and the battery cover, contaminating the battery core.

[0047] Based on the above, the basic idea of ​​this utility model is to construct a pneumatic chamber using a welding cavity and a cover plate, and to set a pneumatic baffle inside the pneumatic chamber. By blowing air, the pneumatic baffle moves downward, so that even if the welding fixture is worn, the pneumatic baffle can still be tightly attached to the battery cover plate, eliminating the gap between the battery cover plate and the pneumatic baffle, preventing welding slag from splashing into the core, and finally the dust is sucked away by negative pressure.

[0048] See Figures 1 to 9 As shown in the figure, an adaptive welding head assembly for laser welding of power battery connecting pieces according to an embodiment of the present invention is provided. The adaptive welding head assembly 3 is located above the battery cover plate 6 and includes a cover plate 31, a pneumatic baffle 32, and a welding cavity 33. The cover plate 31 is fixedly connected to the side of the welding cavity 33, for example, by bolt connection or insertion. This detachable connection facilitates installation and replacement, saving economic costs. Alternatively, the cover plate and welding cavity can be integrally connected to its side, but the manufacturing process would be more complex, and the entire assembly would need to be replaced if damaged.

[0049] The cover plate 31 forms a pneumatic cavity 331 with the side wall of the welding cavity 33; the pneumatic baffle 32 is accommodated in the pneumatic cavity 331 and is placed on the battery cover plate 6.

[0050] The welding cavity 33 has a dust suction channel 332 and an air blowing channel 333 inside. The air blowing channel 333 includes a welding channel 3331 flowing to the welding station and at least one pressurization channel 3332 flowing to the air pressure chamber 331.

[0051] The dust extraction channel 332 is used to remove welding slag and dust from the welding station.

[0052] The opening of the pressurization channel 3332 in the welding cavity 33 leads to the air pressure chamber 331 and is located above the air pressure baffle 32. Air is blown into the air pressure chamber 331 through the pressurization channel 3332, which can apply downward pressure to the air pressure baffle 32, so that the air pressure baffle 32 is tightly attached to the battery cover plate 6, effectively preventing welding slag and dust from splashing and avoiding contamination of the core.

[0053] The "adaptive" aspect of the so-called adaptive welding head assembly mainly refers to the fact that by blowing air upwards onto the air pressure baffle, a downward force is applied to the air pressure baffle, which can eliminate the gap between the air pressure baffle 32 and the battery cover 6, and the air pressure baffle can automatically adapt to changes in the wear level of the battery cover.

[0054] Preferably, there are two cover plates 31, symmetrically arranged on both sides of the welding cavity 33, each forming a pneumatic chamber 331 with the side wall of the welding cavity 33; there are two pneumatic baffles 32, each disposed in one of the two pneumatic chambers 331; there are two pressurization channels 3332, each connected to the pneumatic chamber 331 through the side of the welding cavity 33. During welding, air is blown into the two pneumatic chambers 331 through the two pressurization channels 3332, applying pressure to the two pneumatic baffles 32, so that the two pneumatic baffles 32 are in contact with the battery cover plate 6.

[0055] The two pressurizing channels 3332 are symmetrical about the left and right sides of the central axis of the welding cavity 33. The pressure applied by the two pressurizing channels 3332 to the two air pressure baffles 32 is equal, which can make the two air pressure baffles fit more tightly with the battery cover and better prevent welding slag and dust from splashing.

[0056] It should be noted that guide ribs 34 can be constructed on the air pressure baffle 32, and guide grooves 35 are constructed on the cover plate 31 at corresponding positions. The guide grooves 35 on the cover plate 31 can accommodate the guide ribs 34. Preferably, the guide ribs 34 are located at the middle position of the air pressure baffle 32.

[0057] Alternatively, the air pressure baffle 32 may have a guide groove 35, and the cover plate 31 may have a guide rib 34 at a corresponding position, with the guide groove 35 on the air pressure baffle 32 capable of accommodating the guide rib 34. Preferably, the guide groove 35 is located in the middle of the air pressure baffle 32.

[0058] The aforementioned air pressure baffle is also provided with guide ribs / guide grooves, and the cover plate is provided with guide grooves / guide ribs at corresponding positions. The guide grooves can accommodate the guide ribs, so that the air pressure baffle can move up and down smoothly without causing jamming.

[0059] The opening of the welding channel 3331 is located below the welding cavity 33 and directly opposite the welding station. During welding, it is close to the battery cover plate 6 so that the protective gas covers the welding surface. The opening of the dust suction channel 332 is located above the welding channel 3331. When the dust suction wind speed is increased, the protective gas will not be directly sucked away, preventing other gases and impurities from contaminating and affecting the welding quality.

[0060] Another aspect of this utility model relates to an adaptive dust removal device for laser welding of power battery connecting pieces, including the aforementioned adaptive welding head assembly. This adaptive dust removal device also includes a gas flow pipe 4. The welding head assembly 3 is connected to the gas flow pipe via screws. The gas flow pipe 4 includes a blowing air flow pipe 42 and a suction air flow pipe 41. One end of the blowing air flow pipe 42 is connected to an air compressor via a blowing air interface 1, and the other end communicates with a blowing air channel 333. One end of the suction air flow pipe 41 is connected to a vacuum cleaner via a suction pipe 5, and the other end communicates with a suction air channel 332. This adaptive dust removal device uses blowing air to generate pressure, ensuring a tight fit between the welding station dust removal assembly and the battery cover plate to prevent welding slag from splashing, ultimately allowing the dust to be sucked away by negative pressure.

[0061] The protective gas flow process is summarized as follows: The welding head assembly 3 faces the welding station of the battery cover plate 6. During welding, the protective gas is blown in through the protective gas blowing port 1 and passes through the blowing flow pipe 42. Part of it is blown to the welding station through the welding channel 3331 in the welding cavity 33 to prevent other gases and impurities from contaminating the welding quality; part of it is blown to the air pressure chamber 331 through the pressurization channel 3332 in the welding cavity 33 to apply pressure to the air pressure baffle 32. Under the pressure, the air pressure baffle 32 is pressed tightly against the battery cover plate 6, so that the welding slag dust generated during welding is blocked by the air pressure baffles 32 on both sides and cannot contaminate the core.

[0062] It is worth mentioning that an elastic material, such as plastic, can also be constructed on the bottom surface of the air pressure baffle 32. When the surface of the worn battery cover 6 is uneven, under the action of air pressure, the air pressure baffle with elastic material at the bottom can better fit tightly with the uneven battery cover, achieving a better sealing effect.

[0063] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. If any person skilled in the art, inspired by this description, designs a similar structure to the present invention without departing from its inventive spirit, such design shall fall within the protection scope of the present invention.

Claims

1. An adaptive welding head assembly for laser welding of power battery connecting pieces, characterized in that, The cover plate (31), the air pressure baffle (32) and the welding cavity (33) are included. The cover plate (31) is fixedly connected to the side of the welding cavity (33) and forms an air pressure cavity (331) with the side wall of the welding cavity (33). The air pressure baffle (32) is contained in the air pressure cavity (331), and the air pressure baffle (32) is arranged on the battery cover plate (6). The welding cavity (33) is internally structured with a dust suction channel (332) and a blowing channel (333), and the blowing channel (333) includes a welding channel (3331) flowing to a welding station and at least one pressurizing channel (3332) flowing to the air pressure cavity (331). The dust suction channel (332) is used for sucking away the welding slag dust of the welding station. The pressurizing channel (3332) in the welding cavity (33) is open to the air pressure cavity (331) and is located above the air pressure baffle (32), air is blown to the air pressure cavity (331) through the pressurizing channel (3332), the air pressure baffle (32) can be pressed to the welding station, and the air pressure baffle (32) is tightly attached to the battery cover plate (6).

2. The self-adapting weld head assembly of claim 1, wherein, The cover plate (31) is detachably connected to the side of the welding cavity (33).

3. The self-adapting weld head assembly of claim 2, wherein, The cover plate (31) is two and symmetrically arranged on both sides of the welding cavity (33) and respectively forms an air pressure cavity (331) with the side wall of the welding cavity (33). Each air pressure cavity (331) is provided with an air pressure baffle (32). The pressurizing channel (3332) is two and respectively communicated with the air pressure cavity (331) through the side of the welding cavity (33). During welding, air is respectively blown to the air pressure cavity (331) through the pressurizing channel (3332), the air pressure baffle (32) is pressed to the welding station, and the air pressure baffle (32) is attached to the battery cover plate (6).

4. The self-adapting weld head assembly of claim 3, wherein, The two pressurizing channels (3332) are left-right symmetrical relative to the central axis of the welding cavity (33), and the two pressurizing channels (3332) apply equal pressure to the two air pressure baffles (32).

5. The self-adapting weld head assembly of claim 4, wherein, The air pressure baffle (32) is provided with a guide rib (34), and the cover plate (31) is provided with a guide groove (35) at a corresponding position, and the guide groove (35) on the cover plate (31) can accommodate the guide rib (34).

6. The self-adapting weld head assembly of claim 5, wherein, The guide rib (34) is located at the middle position of the air pressure baffle (32).

7. The self-adapting weld head assembly of claim 4, wherein, The air pressure baffle (32) is provided with a guide groove (35), and the cover plate (31) is provided with a guide rib (34) at a corresponding position, and the guide groove (35) on the air pressure baffle (32) can accommodate the guide rib (34).

8. The self-adapting weld head assembly of claim 7, wherein, The guide groove (35) is located at the middle position of the air pressure baffle (32).

9. The self-adapting weld head assembly of claim 1, wherein, The opening of the welding channel (3331) is located below the welding cavity (33) and directly faces the welding station, and the opening of the dust suction channel (332) is located above the welding channel (3331).

10. An adaptive dust removal device for laser welding of power battery tabs, characterized in that, The adaptive welding head assembly comprises the adaptive dust removal device according to any one of claims 1 to 9, and further comprises a gas flow pipeline (4), wherein the gas flow pipeline (4) comprises a blowing gas flow pipeline (42) and a dust suction flow pipeline (41); one end of the blowing gas flow pipeline (42) is connected with an air compressor through a blowing gas interface (1), and the other end is communicated with a blowing gas channel (333); one end of the dust suction flow pipeline (41) is connected with a dust suction machine through a dust suction pipe (5), and the other end is communicated with a dust suction channel (332).

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