A welding protection device and welding system

Abstract

The utility model discloses a kind of welding protection device and welding system, including copper nozzle, and the air-knife assembly being installed on copper nozzle and being communicated with its upper wind knife mouth;The air-knife assembly includes detachably connected air-knife component one and air-knife component two, air-knife component two is installed to copper nozzle, air-knife shaping channel is formed between air-knife component one and air-knife component two, the air-knife shaping channel entrance is located on air-knife component one, and the outlet of air-knife shaping channel is communicated with the upper wind knife mouth of copper nozzle.This application forms stable air-knife by to compressed air shaping and air-knife shaping, gas flow channel has particularity: compressed air shaping and air-knife shaping are carried out to the protection gas after entering;And constraint protection gas can cover all welding track, constraint protection gas can keep wind speed balanced at every position of welding track;So as to reduce the virtual welding caused by smoke light blocking and the welding process burst hole caused by insufficient coverage.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically to a welding protection device and welding system. Background Technology

[0002] In the field of busbar laser welding, the protective gas delivery method varies depending on the type of battery: Soft-pack batteries and blade batteries: They typically use square copper nozzles to blow air at a single point from the beginning of the weld to cool and protect the weld. Square and cylindrical batteries generally use ring-shaped copper nozzles, which can perform ring-shaped air blowing, fan-shaped air blowing, or single-point oblique air blowing for cooling and protection.

[0003] In the field of side plate laser welding, the commonly used protection solutions are collimator coaxial air blowing or copper nozzle side blowing.

[0004] Currently, a significant problem exists in the welding of pouch batteries: whether the shielding gas is blown from the side or from the starting point, it cannot evenly cover the entire welding path, and the airflow velocity is unevenly distributed throughout the weld. This leads to problems such as incomplete welds caused by smoke and dust blocking light, surface oxidation due to the failure of the weld surface to isolate it from the air, and weld bursts caused by excessive weld slag during the electrode welding process. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to provide a welding protection device to constrain the shielding gas so that the shielding gas can cover the entire welding trajectory.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A welding protection device includes a copper nozzle and an air knife assembly mounted on the copper nozzle and communicating with its upper air knife edge; The air knife assembly includes a detachably connected air knife component one and an air knife component two. The air knife component two is installed on the copper nozzle. An air knife shaping channel is formed between the air knife component one and the air knife component two. The inlet of the air knife shaping channel is located on the air knife component one, and the outlet of the air knife shaping channel is connected to the upper air knife edge of the copper nozzle.

[0007] This application adds two air knife components, Air Knife Component 1 and Air Knife Component 2, to the outside of the copper nozzle, forming an air knife shaping channel. The outlet of this channel is connected to the upper air knife edge of the copper nozzle. Compressed air enters the upper air knife edge through the air knife shaping channel and finally exits from the weld joint. The shielding gas is compressed and shaped as it passes through the air knife shaping channel, creating an air knife effect. This ensures that the shielding gas fully covers the welding trajectory and maintains uniform airflow velocity at all points along the trajectory. This effectively reduces the phenomenon of incomplete welds caused by smoke and dust obstructing light, as well as the problem of weld porosity caused by insufficient gas coverage.

[0008] As a further embodiment of this utility model: the copper nozzle has a through cavity inside, a welding port at the bottom, and an air knife mounting interface connected to the air knife component on the outside; the upper air knife mouth is located at a lower position on the side and is connected to the inner cavity.

[0009] As a further embodiment of this utility model: the copper nozzle is also provided with a dust extraction interface that communicates with the cavity, and the dust extraction interface is connected to the dust extraction channel opened on the second air knife component.

[0010] As a further embodiment of this utility model, the copper nozzle is integrally formed and adopts a square cone structure.

[0011] As a further embodiment of this utility model: a compressed air inlet is provided at the top of the first air knife component, a strip-shaped air knife communicating with the compressed air inlet is provided inside the first air knife component, and a concave air knife shaping groove is provided on the inner side of the first air knife component.

[0012] As a further embodiment of this utility model: the compressed air inlet is provided with at least two paths, and both compressed air inlets are connected to the strip air knife.

[0013] As a further embodiment of this utility model: the two compressed air inlets, the strip-shaped air knife, and the air knife shaping groove are connected to form an air knife shaping channel that is connected to the upper air knife opening.

[0014] As a further embodiment of this utility model: the second air knife component has an air knife shaping surface that contacts one end of the air knife component at a lower position, and a gap is left between the air knife shaping surface and the air knife shaping groove.

[0015] As a further embodiment of this utility model: the second air knife component is provided with a second fastener hole for connecting with the first air knife component, and the first air knife component is provided with a first fastener hole corresponding to the second fastener hole.

[0016] This utility model also discloses a battery welding system, including the aforementioned welding protection device.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This application adds two air knife components, Air Knife Component 1 and Air Knife Component 2, to the outside of the copper nozzle, forming an air knife shaping channel. The outlet of this channel is connected to the upper air knife edge of the copper nozzle. Compressed air enters the upper air knife edge through the air knife shaping channel and is finally discharged from the weld joint. The shielding gas is compressed and shaped as it passes through the air knife shaping channel, creating an air knife effect. This ensures that the shielding gas fully covers the welding trajectory and maintains uniform airflow at all points along the trajectory. Therefore, it effectively reduces the phenomenon of incomplete welds caused by smoke and dust blocking light, as well as the problem of weld porosity caused by insufficient gas coverage. 2. This application utilizes shielding gas to provide full protection for straight weld seams, effectively preventing their oxidation; 3. In the welding process of this application, the shielding gas can efficiently blow away the plasma in the welding area and quickly cool the plasma. This reduces the blocking effect of plasma dust on the laser and reduces the probability of incomplete welding. On the other hand, it stabilizes the molten pool and effectively suppresses the burst defects caused by excessive spatter. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the welding protection device according to an embodiment of the present invention; Figure 2 for Figure 1 A sectional view; Figure 3 This is a schematic diagram of the air knife assembly according to an embodiment of the present utility model; Figure 4 This is a cross-sectional view of the air knife assembly and a schematic diagram of the compressed air flow in an embodiment of this utility model. Figure 5 This is a schematic diagram of the structure of the copper nozzle in an embodiment of the present invention; Figure 6 This is a structural schematic diagram of the air knife component one of the embodiments of this utility model; Figure 7 This is a structural schematic diagram of the air knife component from another perspective in an embodiment of this utility model; Figure 8 This is a schematic diagram of the structure of the second air knife component in this embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. Copper nozzle; 11. Air knife edge; 12. Dust extraction interface; 13. Air knife mounting interface; 14. Welded joint; 2. Air knife component one; 21. Compressed air inlet; 22. Fastener hole one; 23. Strip air knife; 24. Air knife shaping groove; 3. Air knife component two; 31. Air knife mounting part; 311. Mounting hole; 312. Mounting groove; 32. Dust extraction channel; 33. Fastener hole two; 34. Air knife shaping surface; 4. Compressed air plug. Detailed Implementation

[0019] 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.

[0020] Example 1 Reference Figure 1 and Figure 2 A welding protection device includes a copper nozzle 1, an air knife component 1 2, an air knife component 2 3, and a compressed air plug 4. The air knife component 2 3 is detachably connected to the air knife component 1 2 by bolts or pins, and the air knife component 1 2 is also detachably connected to the copper nozzle 1 by bolts or pins.

[0021] Reference Figure 5 The copper nozzle 1 is made entirely of copper and is manufactured using a one-piece forming technology. The copper nozzle 1 has a square cone structure with a fixed wall thickness on all four sides. This allows the laser to pass through the inner cavity of the copper nozzle at a specific incident angle and then reach the surface of the welding base material from the welding port 14.

[0022] The copper nozzle 1 is hollow, with a cavity in the middle. Its top is a connection port and its bottom is a welding port 14. The top connection port is provided with several threaded connection holes for subsequent connection with welding fixtures. The welding port is a weld strip-shaped outlet, and a welding stop bar is provided on the outside of the welding port 14. On the same side of the copper nozzle 1, there is an air knife installation interface 13, a dust extraction interface 12, and an air knife opening 11. The air knife opening 11 is located at a lower position of the copper nozzle 1, the air knife installation interface 13 is located at a higher position of the copper nozzle 1, and the dust extraction interface 12 is located between the air knife opening 11 and the air knife installation interface 13. Both the dust extraction interface 12 and the air knife opening 11 are connected to the inner cavity of the copper nozzle 1.

[0023] Reference Figure 6 and Figure 7 The air knife component 2 includes a compressed air inlet 21, a fastener hole 22, a strip air knife 23, and an air knife shaping groove 24. The air knife component 2 is made of aluminum and is formed by one-piece machining technology. The air knife shaping groove 24 is set at an angle.

[0024] Two compressed air inlets 21 are provided at the top of the air knife component 2. A strip-shaped air knife 23 communicating with the compressed air inlets 21 is provided inside the air knife component 2. A concave air knife shaping groove 24 is provided on the inner side of the air knife component 2. There are at least two compressed air inlets 21, and both compressed air inlets 21 are connected to the strip-shaped air knife 23. The two compressed air inlets 21, the strip-shaped air knife 23, and the air knife shaping groove 24 are connected to form an air knife shaping channel communicating with the upper air knife opening 11. When compressed air enters the air knife, it diffuses through its respective inlets. The air shaped by the compressed air shaping air knife flows into the air knife shaping groove 24.

[0025] It should be noted that there are two compressed air inlets: when compressed air enters the compressed air shaping tank, a single air knife will cause the air volume and air velocity of the strip air knife 23 to be inconsistent on both sides, so it is necessary to set up two or more compressed air inlets.

[0026] Reference Figure 8 The air knife component 2 3 is made of aluminum and is manufactured using an integrated machining process. The air knife component 2 3 includes an air knife mounting part 31, a dust extraction channel 32, a fastener hole 2 33, and an air knife shaping surface 34. The air knife mounting part 31 is installed on the top of the air knife component 2 3 and is used to connect the air knife mounting interface 13 of the copper nozzle 1. A mounting hole 311 is provided on the air knife mounting part 31, and the mounting hole 311 and the air knife mounting interface 13 can be detachably connected by bolts or pins. A mounting groove 312 is provided on the inner side of the air knife mounting part 31, which fits the air knife mounting interface 13. Then, the air knife component 2 3 is connected to the copper nozzle 1 by bolts or pins.

[0027] The air knife component 2 has an air knife shaping surface 34 at a lower position that contacts the end of the air knife component 1 2. The air knife shaping surface 34 is also inclined. When the end of the air knife component 1 2 contacts the air knife shaping surface 34, there is a gap between the air knife shaping surface 34 and the air knife shaping groove 24. The second air knife component 3 is provided with a fastener hole 233 for connecting with the first air knife component 2. The first air knife component 2 is provided with a fastener hole 22 corresponding to the fastener hole 233. The fastener hole 233 and the fastener hole 22 can be connected to the first air knife component 2 and the second air knife component 3 by bolts or pins.

[0028] It should be noted that a dust extraction channel 32 is also provided on the air knife component 2 3, wherein the dust extraction channel 32 can fit with the dust extraction interface 12 on the copper nozzle 1, so the dust extraction channel 32, the dust extraction interface 12 and the cavity inside the copper nozzle 1 are connected.

[0029] The air knife component 1, the air knife component 2, and the compressed air plug 4 together form an air knife assembly, with the compressed air plug 4 connected to the compressed air inlet 21.

[0030] The air knife shaping channel formed by the air knife shaping groove of the air knife component 1 and the air knife shaping surface of the air knife component 2 works together to form a specific compressed air body with a certain flow velocity, a certain flow direction, and a certain shape.

[0031] The air knife structure and its forming principle (as follows) Figure 4 (Illustrative): Compressed air enters through two compressed air inlets 21, forming turbulence at the bottom of the hole and spreading to both sides; after the compressed air air knife is filled with air (i.e., the air knife between the compressed air inlet 21 and the strip air knife 23), the air advances towards the round hole for compression, and then enters the strip air knife 23 briefly; after the air enters the strip air knife 23, it first advances upward and then flows back after encountering resistance, rushing downward into the air knife shaping groove 24, and after long-distance shaping, it forms air knife gas, then enters the cavity from the air knife opening 11, and finally acts on the welding position from the welding port 14.

[0032] Reference Figure 1 and Figure 5 In addition to using shielding gas to suppress weld slag during the welding process of copper nozzle 1, dust removal is also required. Therefore, the shielding gas generating structure and the dust removal structure (i.e., dust extraction interface 12) are integrated. The dust extraction interface 12 needs to be located away from the shielding gas port (i.e., the air knife port 11) to avoid loss of shielding gas.

[0033] The air knife assembly and the copper nozzle 1 together form the air knife structure copper nozzle, and the two are connected by fasteners. Relying on the integrated air knife assembly, the copper nozzle 1 has the functions of protective gas purging and active dust removal. Thanks to the special air knife design, the protective gas can maintain a strip-shaped shape and a uniform wind speed along the weld length, thus protecting straight welds; the highly integrated module allows the protective gas and the dust extraction port to avoid each other spatially, thereby improving dust removal.

[0034] Example 2 A battery welding system includes the welding protection device described in Example 1.

[0035] 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 welding protection device, comprising a copper nozzle, characterized in that, It also includes an air knife assembly that is mounted on a copper nozzle and communicates with its upper air knife edge; The air knife assembly includes a detachably connected air knife component one and an air knife component two. The air knife component two is installed on the copper nozzle, and an air knife shaping channel is formed between the air knife component one and the air knife component two. The inlet of the air knife shaping channel is located on the air knife component one, and the outlet of the air knife shaping channel is connected to the upper air knife mouth of the copper nozzle.

2. The welding protection device according to claim 1, characterized in that: The copper nozzle has a through cavity inside, a welding port at the bottom, and an air knife mounting interface on the outside that connects to the air knife component; the upper air knife mouth is located on the lower side and communicates with the inner cavity.

3. The welding protection device according to claim 2, characterized in that: The copper nozzle is also provided with a dust extraction interface that communicates with the cavity, and the dust extraction interface is connected to the dust extraction channel opened on the second air knife component.

4. A welding protection device according to claim 1, characterized in that: The copper nozzle is integrally formed and adopts a square cone structure.

5. A welding protection device according to claim 1, characterized in that: The top of the air knife component one has a compressed air inlet, and the inside of the air knife component one has a strip-shaped air knife that communicates with the compressed air inlet. A concave air knife shaping groove is provided on the inner side of the air knife component one.

6. A welding protection device according to claim 5, characterized in that: The compressed air inlet is provided with at least two channels, and both channels are connected to the strip air knife.

7. A welding protection device according to claim 6, characterized in that: The two compressed air inlets, strip air knife, and air knife shaping groove are connected to form an air knife shaping channel that connects to the upper air knife edge.

8. A welding protection device according to claim 7, characterized in that: The air knife component has an air knife shaping surface at a lower position that contacts one end of the air knife component, and a gap is left between the air knife shaping surface and the air knife shaping groove.

9. A welding protection device according to claim 1, characterized in that: The second air knife component is provided with a second fastener hole for connecting with the first air knife component, and the first air knife component is provided with a first fastener hole corresponding to the second fastener hole.

10. A welding system, characterized in that, Includes the welding protection device as described in any one of claims 1-9.

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