A welding presser and its application

Abstract

The application discloses a welding pressing device and application thereof, which comprises a pressing mechanism, a driving mechanism for driving the pressing mechanism to move up and down; the pressing mechanism comprises a pressing plate and a welding pressing head connected with the pressing plate; the welding pressing head comprises a pressing head body and a blowing member connected with the lower part of the pressing head body; the pressing head body is provided with an upper cavity; the blowing member is provided with a lower cavity in communication with the upper cavity; the blowing member is provided with air holes in the circumference; the air inlet end of the air holes is uniformly distributed on the top end surface of the lower cavity; the air outlet end is arranged on the inner wall of the lower cavity in the ring direction; the air inlet end and the air outlet end are arranged in a staggered manner; the pressing head body is provided with an air inlet pipe for the flow of protective gas; one end of the air inlet pipe is in communication with the air inlet end. The application blows out spiral divergent airflow through the blowing member, controls the horizontal components of the welding direction and the protective gas outlet direction to be opposite, can effectively blow off the plasma generated in the welding process, and thus improves the quality and stability of laser welding.

Description

Technical Field

[0001] This invention relates to the field of battery pack processing technology, and in particular to a welding and clamping device and its application. Background Technology

[0002] During laser welding of power battery module busbars, they need to be clamped to reduce the gap between the busbar and the battery terminals. During laser welding, when the high-energy laser beam irradiates the workpiece surface, the material evaporates rapidly. The evaporated material (metal vapor) further absorbs laser energy. When the energy is high enough, the atoms and molecules in the vapor ionize, forming plasma. This plasma forms a cloud-like structure between the laser beam and the workpiece surface, causing a significant amount of laser energy to be lost before reaching the workpiece surface, resulting in reduced weld penetration. Injecting a protective gas can dilute the metal vapor density in the plasma, thereby reducing the plasma's shielding effect. Controlling the direction and magnitude of the gas flow is crucial to reducing or eliminating this shielding effect. Summary of the Invention

[0003] The purpose of this invention is to provide a welding clamping device and its application. By blowing out a spiral diverging airflow through an air blowing component, the horizontal component of the welding direction and the shielding gas outlet direction is controlled to be opposite, which can effectively blow away the plasma generated during the welding process, thereby improving the quality and stability of laser welding.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] In a first aspect, the present invention discloses a welding clamping device, comprising a clamping mechanism and a driving mechanism for driving the clamping mechanism to move up and down; the clamping mechanism includes a pressure plate and a welding head connected to each other, the welding head includes a head body and an air blowing member connected to the lower part of the head body, wherein the head body has an upper cavity, and the air blowing member has a lower cavity communicating with the upper cavity; the air blowing member has a vent hole circumferentially connected with the lower cavity for forming a spiral airflow; the head body has an air inlet pipe communicating with the vent hole for supplying protective gas flow.

[0006] A further embodiment: the air inlet end of the vent is evenly distributed circumferentially on the top surface of the lower cavity, and the air outlet end is arranged circumferentially on the inner wall of the lower cavity, and the air inlet end and the air outlet end are arranged at intervals and staggered.

[0007] A further solution: the extended line of the vent hole forms an angle of 20-30° with the central axis of the lower cavity.

[0008] A further embodiment: The upper cavity and the lower cavity form a frustum-shaped cavity with a larger upper portion and a smaller lower portion.

[0009] A further embodiment: The upper end face of the air blowing component is provided with an annular groove, the air inlet end is evenly distributed circumferentially on the annular groove, and the air outlet end of the air inlet pipe is connected to the annular groove.

[0010] A further solution: The pressure head body has a negative pressure dust removal port that is connected to the upper cavity.

[0011] Further solutions include: a dust removal mechanism mounted on the pressing mechanism, wherein the dust removal mechanism is connected to a negative pressure dust removal port via a dust removal pipe; and / or;

[0012] The clamping mechanism also includes a side plate connected to the pressure plate, and the side plate is slidably connected to the drive mechanism in the upper and lower directions.

[0013] A further embodiment: The driving mechanism includes a vertical plate slidably connected to the side plate, a pressing cylinder connected to the vertical plate, and a pressure sensor located at the extension end of the pressing cylinder, wherein the pressure sensor selectively presses against the side plate.

[0014] A further solution: The pressure plate and the welding head are elastically connected by an elastic element.

[0015] A further solution: The pressure plate and the welding head are elastically connected by an elastic element.

[0016] Secondly, the present invention discloses the application of the above-mentioned welding clamping device, specifically for galvanometer welding, employing a circular welding trajectory, and the welding direction is opposite to the horizontal component of the airflow in the blowing component.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The welding head in this invention can blow out a spiraling, diverging protective airflow, which not only significantly prevents slag spatter but also effectively weakens the plasma shielding effect, thereby greatly improving the quality and stability of laser welding. This invention is particularly suitable for welding busbars and battery terminals, where the welding trajectory exhibits a circular characteristic. Through precise control, the welding direction is kept completely opposite to the direction of the horizontal component of the protective airflow. This design ensures that the protective airflow can more efficiently cover the entire welding area, effectively blocking external air from entering and thus avoiding the risk of oxidation of the molten pool. More advancedly, the reverse-flowing spiral protective airflow plays a crucial role in the solidification process of the weld pool. It promotes a more uniform spread of the molten pool, significantly improving the weld formation effect. Simultaneously, this reverse airflow effectively reduces the generation of defects such as porosity and cracks in the weld, further enhancing the mechanical properties of the weld. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a side view of the present invention;

[0021] Figure 3 This is an exploded view of the pressure plate structure in this invention;

[0022] Figure 4 This is a side sectional view of the welding pressure head in this invention;

[0023] Figure 5 This is a perspective view of the welding pressure head in this invention;

[0024] Figure 6 This is a perspective view of the air blowing component in this invention;

[0025] Figure 7 This is a schematic diagram of the welding direction and the shielding gas flow direction in this invention;

[0026] In the diagram: 1-Clamping mechanism, 11-Pressure plate, 111-Upper insulating plate, 112-Metal plate, 113-Lower insulating plate, 12-Welding pressure head, 121-Pressure head body, 1211-Upper cavity, 1212-Air inlet pipe, 1213-Negative pressure dust removal port, 1214-Boss, 122-Air blowing component, 1221-Lower cavity, 1222-Ventilation hole, 12221-Air inlet end, 12222-Air outlet end, 1223-Annular groove, 13-Side plate, 2-Drive mechanism, 21-Upright plate, 22-Clamping air, 3-Dust removal mechanism, 31-Dust removal pipe, 4-Slide rail, 5-Elastic element, 6-Pressure reducing valve. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] Please see Figure 1-6In this embodiment, a welding clamping device is described in conjunction with the actual operation of welding a busbar and an electromagnetic pole using a galvanometer welding device. This clamping fixture includes a clamping mechanism 1 and a driving mechanism 2 that drives the clamping mechanism 1 to move up and down. The clamping mechanism 1 includes a pressure plate 11 and a welding head 12 connected to the pressure plate 1. The welding head 12 includes a head body 121 and an air-blowing component 122 connected to the lower part of the head body 121. The head body 121 has an upper cavity 1211, and the air-blowing component 122 has a lower cavity 1221 communicating with the upper cavity 1211. The component 122 has vent holes 1222 circumferentially open. The air inlet end 12221 of the vent holes 1222 is evenly distributed circumferentially on the top surface of the lower cavity 1221, and the air outlet end 12222 is arranged circumferentially on the inner wall of the lower cavity 1221. The air inlet end 12221 and the air outlet end 12222 are arranged at intervals and staggered. The pressure head body 121 has an air inlet pipe 1212 for the flow of protective gas. One end of the air inlet pipe 1212 is connected to the air inlet end 12221. The drive mechanism 2 drives the pressing mechanism 1 to move up and down. When it moves down, the welding pressure head 12 brings the busbar and the battery terminal into close contact. The laser beam is emitted from the cavity formed by the upper cavity 1211 and the lower cavity 1221 and focused on the contact surface between the busbar and the battery terminal, forming an annular weld by melting the material.

[0030] Furthermore, the extended line of the vent 1222 forms a 20-30° angle with the central axis of the lower cavity 1221. The shielding gas is blown towards the vicinity of the weld through the circumferentially arranged vents 1222, forming a rotating annular airflow off-axis, which is evenly focused around the weld, reducing spatter generated during welding and protecting the focusing lens from spatter damage. In addition, the shielding gas effectively removes plasma generated during welding, preventing plasma from shielding the laser, improving laser welding quality, and increasing the weld pool depth.

[0031] Furthermore, the upper cavity 1211 and the lower cavity 1221 form a frustum-shaped cavity with a larger upper section and a smaller lower section. Cavity 1221 has a tubular structure with a gradually narrowing cross-section. The shielding gas is introduced into the welding area through the lower cavity 1221, and the gas flow velocity gradually increases based on the Venturi effect in fluid mechanics. When the laser enters the welding area through this cavity, the laser focusing intensity can be appropriately increased, the laser divergence angle can be reduced, making the beam more parallel and collimated, and reducing energy loss.

[0032] Furthermore, an annular groove 1223 is provided on the upper end face of the air blowing component 122, and the air inlet end 12221 is evenly distributed on the annular groove 1223 in a circumferential direction. The air outlet end of the air inlet pipe 1212 is connected to the annular groove 1223.

[0033] Furthermore, the pressure head body 121 has a negative pressure dust removal port 1213 connected to the upper cavity 1211. This negative pressure dust removal port 1213 is connected to the dust removal mechanism 3 via a dust removal pipe 31. The dust removal mechanism 3 generates negative pressure, sucking away the welding slag blocked by the protective airflow. The negative pressure dust removal port 1213 is positioned slightly higher than the vent 1222.

[0034] Furthermore, the number of intake pipes 1212 can be one, preferably two, symmetrically connected on both sides of the annular groove 1223, which facilitates the improvement of the stability of the protective airflow.

[0035] Furthermore, the clamping mechanism 1 also includes a side plate 13 connected to the pressure plate 11. The side plate 13 is parallel to the pressure plate 11, and the side plate 13 and the drive mechanism 2 are connected to slide up and down through the slide rail 4.

[0036] Furthermore, the drive mechanism 2 includes a vertical plate 21 slidably connected to the side plate 13, a pressing cylinder 22 connected to the vertical plate 21, and a pressure sensor connected to the bottom telescopic end of the pressing cylinder 22. The pressure sensor is connected to the top side of the side plate 13 and selectively presses the side plate 13.

[0037] Furthermore, the pressure plate 11 includes a metal plate 112, an upper insulating plate 111 and a lower insulating plate 113 clamped at both ends of the metal plate 112. These three plates are respectively provided with mounting holes for accommodating the welding pressure head 12. The end of the pressure head body 121 connected to the air blowing component 122 has protrusions 1214 extending to both sides. An elastic element 5, which is a spring, is provided between the lower insulating plate 113 and the protrusions 1214 to achieve an elastic connection between the welding pressure head 12 and the pressure plate 11, ensuring good contact between the welding pressure head 12 and the workpiece.

[0038] Furthermore, the intake end of the intake pipe 1212 is connected to a nitrogen source through a nitrogen splitter and a pressure reducing valve 6, and the flow rate of the intake pipe 1212 is monitored in real time by the connected flow meter.

[0039] Please continue reading. Figure 7 An application of a welding clamping device for galvanometer welding employs a circular welding trajectory, with the welding direction opposite to the horizontal component of the airflow in the blowing component 122. This effectively removes the plasma generated during the welding process, blowing the plasma and welding plumes away from the area to be welded, preventing the plasma from shielding the laser, ensuring the stability of the welding, and increasing the weld pool.

[0040] The following describes in detail the usage of the battery module busbar welding clamping, dust removal, and protective gas blowing device, as well as the welding method based on this device.

[0041] Shielding gas: External nitrogen is introduced into each welding head through a nitrogen distributor to ensure the stability of nitrogen as a welding shielding gas.

[0042] Negative pressure dust removal: Each welding head is equipped with a single negative pressure dust removal port 1213, which is connected to the external dust removal mechanism 3 through the dust removal pipe 31 to ensure the formation of negative pressure inside the welding head 12 to adsorb welding slag and fumes in the cavity of the welding head 12; welding slag that is not effectively adsorbed is adsorbed and removed by the upper dust removal mechanism 3.

[0043] Before welding, the drive mechanism 2 drives the welding head 12 to press the area to be welded, and nitrogen and negative pressure dust removal are turned on. The workpiece is pressed by welding using a circular welding trajectory to achieve a good dust removal effect.

[0044] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0045] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A welding clamping device, comprising a clamping mechanism (1) and a driving mechanism (2) for driving the clamping mechanism (1) to move up and down; the clamping mechanism (1) comprises a pressure plate (11) and a welding pressure head (12) connected to each other, characterized in that, The welding head (12) includes a head body (121) and an air blowing component (122) connected to the lower part of the head body (121). The head body (121) has an upper cavity (1211), and the air blowing component (122) has a lower cavity (1221) that communicates with the upper cavity (1211). The air blowing component (122) has a vent hole (1222) that communicates with the lower cavity (1221) to form a spiral airflow around its circumferential direction. The head body (121) has an air inlet pipe (1212) that communicates with the vent hole (1222) for the flow of protective gas. The air inlet (12221) of the vent (1222) is evenly distributed around the top surface of the lower cavity (1221), and the air outlet (12222) is arranged around the inner wall of the lower cavity (1221). The air inlet (12221) and the air outlet (12222) are arranged at intervals and staggered. The extension line of the vent (1222) forms an angle of 20-30° with the central axis of the lower cavity (1221); The upper cavity (1211) and the lower cavity (1221) form a truncated cone structure with a larger upper part and a smaller lower part.

2. The welding clamping device according to claim 1, characterized in that, The upper end face of the air blowing component (122) is provided with an annular groove (1223), the air inlet end (12221) is evenly distributed on the annular groove (1223) in the circumference, and the air outlet end of the air inlet pipe (1212) is connected to the annular groove (1223).

3. The welding clamping device according to claim 1, characterized in that, The pressure head body (121) has a negative pressure dust removal port (1213) connected to the upper cavity (1211).

4. The welding clamping device according to claim 3, characterized in that, It also includes a dust removal mechanism (3) disposed on the pressing mechanism (1), the dust removal mechanism (3) being connected to the negative pressure dust removal port (1213) via a dust removal pipe (31); and / or; The pressing mechanism (1) also includes a side plate (13) connected to the pressure plate (11), and the side plate (13) is slidably connected to the driving mechanism (2) in the upper and lower directions.

5. The welding clamping device according to claim 4, characterized in that, The drive mechanism (2) includes a vertical plate (21) slidably connected to the side plate (13), a pressing cylinder (22) connected to the vertical plate (21), and a pressure sensor located at the extension end of the pressing cylinder (22). The pressure sensor is selectively pressed onto the side plate (13).

6. The welding clamping device according to claim 1, characterized in that, The pressure plate (11) and the welding head (12) are elastically connected by an elastic element (5).

7. An application of the welding clamping device according to any one of claims 1-6, characterized in that, For galvanometer welding, a circular welding trajectory is adopted, and the welding direction is opposite to the horizontal component of the airflow in the blowing component (122).

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