Welding device for battery box body of new energy automobile

Abstract

The utility model belongs to the technical field of welding, and particularly relates to a welding device for a battery box body of a new energy automobile, which comprises a control grab handle, a laser sleeve, a shunt pipe, a gas ejector pipe, a transmission shaft and an impeller, the transmission wheel and the driven wheel are correspondingly matched to form a welding wire conveying channel, during welding operation, ammonia gas input by an external gas source flows in the gas spraying pipe, the impact impeller drives the transmission shaft to rotate synchronously, then the transmission wheel and the driven wheel are driven to clamp a welding wire to be fed at a constant speed, and it is guaranteed that the welding wire and a welding point are accurately fused. Ammonia is sprayed out through the outlet of the gas spraying pipe to clean impurities on the surface of the box body before welding, the impurities are prevented from affecting the welding seam quality, part of the ammonia is guided to the rear side of the laser sleeve through the flow dividing pipe to be sprayed out, an inert gas protection layer is formed, air is isolated, a welding area is prevented from being oxidized, and a welding part can be rapidly cooled to reduce deformation.

Description

Technical Field

[0001] This utility model belongs to the field of welding technology, specifically referring to a welding device for a new energy vehicle battery box. Background Technology

[0002] As the core load-bearing and protective component of the power battery pack, the battery housing needs to provide a stable mounting foundation for the battery modules and also needs to have excellent sealing performance, structural strength, and corrosion resistance. Currently, most new energy vehicle battery housings are made of lightweight, high-strength materials such as aluminum alloys. Laser welding has advantages such as high energy density, fast welding speed, and narrow heat-affected zone. However, existing welding equipment for battery housings has the following problems:

[0003] (1) Existing laser welding devices mostly use independent motor drive for wire feeding. The wire is transported by the transmission mechanism driven by the motor. For handheld welding devices commonly used for welding battery boxes of new energy vehicles, this will significantly increase the overall weight and volume of the handheld end, resulting in a significant increase in the labor intensity of operators when holding the device for a long time, which in turn affects the stability of the welding operation.

[0004] (2) Before welding, the battery box is prone to dust, metal shavings, oil and other impurities. These impurities will be melted by high temperature during the welding process and mixed into the molten pool, forming defects such as pores and slag inclusions, reducing the sealing and strength of the weld. Existing welding equipment usually lacks an integrated pre-welding cleaning mechanism. Utility Model Content

[0005] This invention overcomes the shortcomings of existing technologies and provides a welding device for battery boxes of new energy vehicles. It features a power transmission structure where the kinetic energy of helium flow within the jet pipe drives the impeller to rotate. Through the coaxial fixing design of the impeller, drive shaft, and drive wheel, a welding wire feeding mechanism is formed in conjunction with the driven wheel on the connecting frame, achieving uniform and precise feeding of the welding wire. The dual airflow channels of the jet pipe and the splitter pipe allow for pre-welding surface cleaning of impurities, while the airflow guided by the splitter pipe to the rear of the laser generator forms an inert gas protective layer, preventing oxidation of the welding area and enabling rapid cooling after welding.

[0006] The technical solution adopted by this utility model is as follows: This solution provides a welding device for a new energy vehicle battery box, including a control handle and a laser generator. The laser generator is fixedly connected to one end of the control handle. An air cavity is opened inside the control handle. A jet pipe is fixedly connected through the side wall of the control handle. The jet pipe communicates with the air cavity. A connecting frame is fixedly connected to the circumferential wall of the jet pipe. A guide sleeve is fixedly provided on the connecting frame. A drive shaft is rotatably connected to the circumferential wall of the jet pipe. A drive wheel is coaxially fixedly connected to the drive shaft.

[0007] Furthermore, an impeller is coaxially fixedly connected to one end of the drive shaft located inside the jet pipe. The blades of the impeller extend in a direction that matches the flow direction of the airflow inside the jet pipe, so as to receive the impact force of the airflow and drive it to rotate.

[0008] Furthermore, a driven wheel is rotatably connected to the connecting frame at the position corresponding to the transmission wheel. The wheel surfaces of the transmission wheel and the driven wheel are in contact to form a welding wire conveying channel. The outlet end of the guide sleeve is aligned with the inlet end of the conveying channel to ensure that the welding wire enters the conveying channel stably.

[0009] Furthermore, a flow divider is also connected through the side wall of the control grip. The air inlet of the flow divider is connected to the air chamber, and the air outlet of the flow divider is set towards the rear side of the laser generator to guide part of the airflow to the welding completed area.

[0010] The beneficial effects of this utility model by adopting the above structure are as follows:

[0011] (1) The impeller is driven to rotate by the kinetic energy of the helium flow in the jet pipe. The transmission wheel is fixed coaxially with the impeller. The external gas source can stably output helium, thereby ensuring that the speed at which the transmission wheel drives the welding wire to move along the guide sleeve is uniform and controllable, so that the welding wire can fully fuse with the molten box metal at the welding point, effectively avoiding defects such as weld accumulation and overheating caused by excessively fast welding wire feeding, or incomplete weld penetration caused by excessively slow feeding.

[0012] (2) The outlet of the jet pipe faces the front of the welding point. When helium gas is ejected from the jet pipe, it can directly blow away the welding surface of the battery box and remove the dust, metal shavings, oil and other impurities attached to the surface.

[0013] (3) The shunt tube can guide some of the helium gas to the welded area, which can form a dense gas protective layer on the surface of the high-temperature area after welding, isolate the air from the contact between the high-temperature metal, completely avoid the oxide scale and embrittlement layer of the weld joint due to oxidation, and ensure the corrosion resistance and conductivity of the joint; the high-speed ejected helium gas can quickly remove the residual heat of the welded area and achieve forced cooling. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the welding device for a new energy vehicle battery box proposed in this utility model;

[0015] Figure 2 A cross-sectional view of a welding device for a new energy vehicle battery box proposed in this utility model. Figure 1 ;

[0016] Figure 3 A cross-sectional view of a welding device for a new energy vehicle battery box proposed in this utility model. Figure 2 .

[0017] Among them, 1. Control handle, 2. Laser generator, 3. Air chamber, 4. Diverter pipe, 5. Jet pipe, 6. Connecting frame, 61. Fixing ring, 62. Fixing bracket, 7. Guide sleeve, 8. Drive shaft, 9. Drive wheel, 10. Impeller, 11. Driven wheel.

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] Example 1: Please refer to Figures 1-3 This embodiment provides a welding device for a new energy vehicle battery box, including a control handle 1 and a laser generator 2. The laser generator 2 is fixedly connected to one end of the control handle 1. An air chamber 3 is formed inside the control handle 1. A shunt pipe 4 is connected through the side wall of the control handle 1, and the air inlet end of the shunt pipe 4 is connected to the air chamber 3. A jet pipe 5 is fixedly connected through the side wall of the control handle 1, and the jet pipe 5 is connected to the air chamber 3. A connecting frame 6 is fixedly connected to the circumferential wall of the jet pipe 5. The connecting frame 6 includes a fixing ring 61 and a fixing bracket 62. The fixing ring 61 is coaxially sleeved and fixed to the outer wall of the jet pipe 5. One end of the bracket 62 is hinged to the side wall of the fixing ring 61. A guide sleeve 7 is fixedly provided at one end of the fixing bracket 62. A drive shaft 8 is rotatably connected to the circumferential wall of the jet pipe 5. A drive wheel 9 is coaxially fixedly connected to the drive shaft 8. An impeller 10 is coaxially fixedly connected to one end of the drive shaft 8 inside the jet pipe 5. The blade extension direction of the impeller 10 is adapted to the flow direction of the airflow inside the jet pipe 5. A driven wheel 11 is rotatably connected to the fixing bracket 62 at the position corresponding to the drive wheel 9. The wheel surfaces of the drive wheel 9 and the driven wheel 11 are in contact to form a welding wire conveying channel. The outlet end of the guide sleeve 7 is aligned with the inlet end of the conveying channel to ensure that the welding wire enters the conveying channel stably.

[0021] In this embodiment, one end of the welding wire is passed through the guide sleeve 7 and placed in the conveying channel between the drive wheel 9 and the driven wheel 11. The power interface at the tail end of the control handle 1 is connected to an external power source. Then, one end of the air pipe is connected to the connection port of the air chamber 3 on the control handle 1, and the other end of the air pipe is connected to an external air source.

[0022] The operator holds the control handle 1 and aligns the front end of the laser generator 2 with the welding position of the battery box. The operator presses the start button on the control handle 1, and the laser generator 2 starts. The generated laser beam is focused by the focusing lens and shines on the welding point of the battery box, instantly generating high temperature and melting the metal at the welding point. At the same time, the external gas source inputs helium into the gas chamber 3. When the helium flows in the jet pipe 5, it impacts the impeller 10 and drives the impeller 10 to rotate. The impeller 10 is coaxially fixedly connected to the drive shaft 8, so the drive shaft 8 also rotates. The drive wheel 9 on the drive shaft 8 rotates synchronously. Since the drive wheel 9 and the driven wheel 11 clamp the welding wire, the rotation of the drive wheel 9 drives the welding wire to move along the guide sleeve 7. The welding wire moves towards the welding point under the laser generator 2 at a stable speed. The molten welding wire fuses with the molten metal at the welding point of the battery box to form a welded joint.

[0023] While the helium gas drives the impeller 10 to rotate, it moves down along the jet pipe 5 and is ejected from the outlet of the jet pipe 5 to clean the surface of the battery box before welding, blowing away the dust and impurities on the surface to prevent these impurities from affecting the welding quality. Another part of the helium gas flows through the split pipe 4 to the rear side of the laser generator 2 and is ejected from the outlet of the split pipe 4, forming a helium protective layer on the surface of the welded battery box. Since helium is an inert gas, it can isolate air and prevent the welded area from directly contacting oxygen and undergoing an oxidation reaction. At the same time, the ejected helium gas can also cool the welded area, accelerate the cooling rate of the welded area, and reduce welding deformation.

[0024] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A welding device for new energy vehicle battery box, comprising a control handle (1) and a laser generator (2), the laser generator (2) is fixedly connected to one end of the control handle (1), characterized in that, An air chamber (3) is provided inside the control handle (1). A jet pipe (5) is fixedly connected through the side wall of the control handle (1). The jet pipe (5) is connected to the air chamber (3). The outlet end of the jet pipe (5) faces the front of the welding point of the laser generator (2). A connecting frame (6) is fixedly connected to the circumferential wall of the jet pipe (5). A guide sleeve (7) is fixedly provided on the connecting frame (6). A drive shaft (8) is rotatably connected to the circumferential wall of the jet pipe (5). A drive wheel (9) is coaxially fixedly connected to the drive shaft (8). An impeller (10) is coaxially fixedly connected to one end of the drive shaft (8) inside the jet pipe (5). A driven wheel (11) is rotatably connected to the connecting frame (6) at the position corresponding to the drive wheel (9).

2. The welding device of a new energy vehicle battery box according to claim 1, characterized in that: The blade extension direction of the impeller (10) is adapted to the flow direction of the airflow in the jet pipe (5).

3. The welding device of a new energy vehicle battery box according to claim 1, characterized in that The drive wheel (9) and the driven wheel (11) are fitted together to form a welding wire conveying channel.

4. The welding device of a new energy vehicle battery box according to claim 1, characterized in that: A shunt pipe (4) is also connected through the side wall of the control handle (1). The air inlet of the shunt pipe (4) is connected to the air chamber (3). The air outlet of the shunt pipe (4) faces the rear side of the laser generator (2). The shunt pipe (4) and the jet pipe (5) form a dual-channel air outlet for the air chamber.

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