A welding method and apparatus for sealing nails of power batteries

Abstract

This invention provides a welding method and apparatus for a power battery sealing pin. The welding method includes: driving a first clamping assembly to clamp a first end of the battery; acquiring the position information of the battery injection hole and driving a moving assembly to adjust the injection hole to a welding position; driving a plurality of spaced positioning protrusions on a first pressing assembly to press the end face of a second end of the battery, and simultaneously driving a second clamping assembly to clamp the second end; driving the second pressing assembly to press the sealing pin against the injection hole; performing pre-spot welding on the sealing pin and the injection hole in a preset welding groove; and driving away the second pressing assembly to perform full welding on the sealing pin and the injection hole. The welding method and apparatus for power battery sealing pins provided by this invention aim to solve the problems of low welding accuracy and welding efficiency between batteries and sealing pins in traditional technologies.

Description

Technical Field

[0001] This invention belongs to the field of power battery technology, and particularly relates to a welding method and apparatus for power battery sealing nails. Background Technology

[0002] Laser welding is a highly efficient and precise welding method that utilizes a high-energy-density laser beam as a heat source. It is a crucial application of laser materials processing technology. In the 1970s, it was primarily used for welding thin-walled materials and low-speed welding. The welding process is heat conduction-based, meaning the laser radiation heats the workpiece surface, and the surface heat diffuses inward through heat conduction. By controlling parameters such as the laser pulse width, energy, peak power, and repetition frequency, the workpiece melts, forming a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts.

[0003] In response to the call for energy conservation and emission reduction, the new energy vehicle industry has developed rapidly, driving the development of power batteries for new energy vehicles. As a core component of new energy vehicles, power batteries play a decisive role in the performance of the entire vehicle. Power batteries require welding in many areas during manufacturing, including electrode tab welding, flexible connection welding, and sealing pin welding. As the final welding process for power batteries, sealing pin welding is crucial; any welding defects will render the power battery unusable.

[0004] In the existing battery sealing nail welding process, there are defects such as inaccurate placement of the sealing nail and welding position, which greatly reduces the positional accuracy of the product and sealing nail after welding, affects the weld effect, and reduces the welding yield of sealing nail. Summary of the Invention

[0005] This invention provides a welding method and apparatus for power battery sealing nails, which solves the problems of low welding accuracy and welding efficiency between batteries and sealing nails in traditional technologies.

[0006] To address the above problems, this invention provides a welding method for a power battery sealing pin, comprising:

[0007] Drive the first clamping assembly to clamp the first end of the battery;

[0008] Obtain the position information of the battery injection hole and drive the moving component to adjust the injection hole to the welding station;

[0009] The first clamping assembly is driven to press the end face of the second end of the battery by multiple spaced positioning protrusions, and the second clamping assembly is driven to clamp the second end simultaneously.

[0010] Drive the second clamping assembly to press the sealing pin against the injection hole;

[0011] The sealing nail and the injection hole are pre-spot welded in a pre-set welding groove;

[0012] Remove the second clamping assembly and fully weld the sealing pin to the injection hole;

[0013] The process includes, before driving the moving component to adjust the injection hole to the welding station, or after driving the multiple spaced positioning protrusions on the first clamping component to clamp the end face of the second end of the battery, and simultaneously driving the second clamping component to clamp the second end, pre-installing the sealing pin at the injection hole.

[0014] According to a welding method for a power battery sealing pin provided by the present invention, pre-installing the sealing pin at the injection hole includes:

[0015] The sealing pin is initially extracted and placed in the limiting seat for adjustment.

[0016] The sealing pin is then drawn up again and placed at the injection hole.

[0017] According to the present invention, a welding method for a power battery sealing nail includes obtaining the position information of the battery injection hole and driving a moving component to adjust the injection hole to the welding position, comprising:

[0018] Based on the position information of the injection hole, the position of the battery is rotatably adjusted to bring the injection hole to the welding position; and / or,

[0019] Based on the location information of the injection hole, adjust the position of the welding equipment so that the welding station is set to correspond to the injection hole.

[0020] According to the present invention, a welding method for a power battery sealing pin, comprising driving a second clamping assembly to clamp the sealing pin at the injection hole, includes:

[0021] The second clamping assembly is driven to rotate and approach the end face of the second end, so that the clearance plate of the second clamping assembly presses against the sealing nail;

[0022] The first pressing component has the welding groove formed thereon. When the relief plate presses the sealing nail in the welding groove, the relief plate forms a relief space for the laser to pre-spot weld the sealing nail.

[0023] According to the present invention, a welding method for a power battery sealing pin, comprising driving a second clamping assembly to clamp the sealing pin at the injection hole, includes:

[0024] The second clamping component is driven to approach the end face of the second end, so that multiple spaced positioning blocks on the second clamping component press the sealing nail, and a clearance space is formed between each positioning block to allow the laser to pre-spot weld the sealing nail.

[0025] The present invention also provides a welding device for a power battery sealing pin, used for welding a battery and a sealing pin, the welding device for the power battery sealing pin comprising:

[0026] Base;

[0027] A rotating assembly is mounted on the base;

[0028] A first clamping assembly is rotatably mounted on the rotating assembly to clamp the first end of the battery;

[0029] A detection component, fixed to one side of the base, is used to detect the position information of the liquid injection hole on the second end of the battery. The rotation component adjusts the position of the battery rotatably according to the position information.

[0030] The first clamping component is slidably mounted on the base and has a travel distance to and from the battery. The first clamping component is provided with a plurality of positioning protrusions spaced apart to abut against and clamp the second end face of the battery during the travel distance to the battery. The first clamping component is also provided with a welding groove.

[0031] The second clamping assembly is rotatably mounted on the first clamping assembly and has a travel stroke that approaches and moves away from the sealing nail. During the travel stroke that approaches the sealing nail, the second clamping assembly clamps the sealing nail in the welding groove.

[0032] The second clamping component is disposed on the end face of the first clamping component near the first clamping component, for clamping and fixing the side wall of the battery;

[0033] A welding mechanism, mounted above the second clamping assembly, is used to weld the sealing pin to the injection hole.

[0034] According to the present invention, a welding device for a power battery sealing nail is provided, wherein the first clamping assembly includes a first driving member and a pressure plate, the first driving member being mounted on the base to drive the pressure plate to approach or move away from the end face of the battery;

[0035] The welding groove is formed on the pressure plate. A guide groove is formed on the side of the welding groove near the battery. A clamping plate extends outward from the central axis of the end of the guide groove with a smaller opening area. A plurality of positioning protrusions are arranged at intervals on the side of the clamping plate near the battery.

[0036] When the first driving member drives the pressure plate to approach and press the battery, one end of the battery abuts and presses against each of the positioning protrusions along the guide groove.

[0037] According to the present invention, a welding device for a power battery sealing nail is provided, wherein the second clamping assembly is disposed on the mounting plate and has a travel distance from or near the welding groove. When the pressure plate presses the battery, the second clamping assembly simultaneously clamps the peripheral wall of the battery.

[0038] According to the present invention, a welding device for a power battery sealing nail is provided, wherein the second clamping assembly includes a second driving member and a relief pressure plate disposed on one side of the welding groove, the second relief pressure plate is provided with a relief groove, and the second driving member drives the relief pressure plate to rotate closer to or away from the sealing nail.

[0039] According to the welding device for sealing nails of a power battery provided by the present invention, the second driving member is further provided with an encoder, the encoder being electrically connected to the second driving member, and the encoder being used to sense the number of rotations of the second driving member.

[0040] The welding method for power battery sealing pins provided by this invention, by acquiring the location information of the battery injection hole and pre-installing the sealing pin, can ensure the installation position of the sealing pin, thereby accurately placing the sealing pin into the preset installation position at the injection hole. This effectively solves the problem of inaccurate sealing pin installation position in traditional technology, which requires continuous adjustment of the position when matching with the battery. In addition, this invention improves the positioning accuracy of the battery and sealing pin by using a first clamping component, a second clamping component, a first pressing component, and a second pressing component for multiple positioning of the battery and the sealing pin. Furthermore, the sequential welding sequence of pre-spot welding and full welding further improves the welding quality. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating the welding method for the sealing nail of the power battery provided by the present invention.

[0043] Figure 2 This is a first three-dimensional structural schematic diagram of the welding device for the power battery sealing nail provided by the present invention;

[0044] Figure 3This is a second three-dimensional structural schematic diagram of the welding device for the power battery sealing nail provided by the present invention;

[0045] Figure 4 This is a third three-dimensional structural schematic diagram of the welding device for the power battery sealing nail provided by the present invention;

[0046] Reference numerals: 1: Welding device for power battery sealing nails; 2: Base; 3: First clamping assembly; 4: Second clamping assembly; 5: Second clamping assembly; 6: Positioning protrusion; 7: Pressure plate; 8: Welding groove; 9: Guide groove; 10: Clearance pressure plate; 11: Clearance groove; 12: First driving component; 13: Second driving component; 14: Encoder; 15: Drive motor; 16: Transmission shaft; 17: Abutment plate. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0048] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not 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 the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0050] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] The following is combined with Figures 1-4 The present invention describes a welding method and apparatus for power battery sealing nails.

[0053] This invention provides a welding method for sealing nails in power batteries, comprising:

[0054] S100, Drive the first clamping assembly to clamp the first end of the battery;

[0055] S200: Obtain the position information of the battery injection hole, and drive the moving component to adjust the injection hole to the welding station;

[0056] S300, drive the first clamping assembly to press the end face of the second end of the battery with a plurality of spaced positioning protrusions, and simultaneously drive the second clamping assembly to clamp the second end;

[0057] S400, Drive the second clamping assembly to press the sealing pin against the injection hole;

[0058] S500. Pre-tack weld the sealing nail and the injection hole in a preset welding groove.

[0059] S600, remove the second clamping assembly and perform full welding on the sealing pin and the injection hole;

[0060] S200, before driving the moving component to adjust the injection hole to the welding station, or S300, after driving the multiple spaced positioning protrusions on the first clamping component to clamp the end face of the second end of the battery, and simultaneously driving the second clamping component to clamp the second end, includes: S10, pre-installing the sealing nail at the injection hole.

[0061] When welding the battery to the sealing nail, both the battery and the sealing nail need to be precisely fixed in position to ensure a good and accurate welding effect. In the technical solution provided by this invention, the position of the battery first needs to be adjusted to expose the battery injection hole to the welding station. Specifically, the first clamping component is driven to clamp the first end of the battery. The first clamping component can be a gripper, a robotic arm, or a clamping seat, mainly for pre-fixing the battery. After the battery is pre-fixed, the position information of the injection hole on the second end of the battery needs to be obtained, and the moving component is driven to move according to the obtained position information to expose the injection hole to the welding station, facilitating welding with the sealing nail. It should be noted that the position information of the injection hole can be obtained using a vision camera, and the actual position of the injection hole can be determined by taking multiple pictures.

[0062] After the position of the injection hole is determined, the battery and the sealing pin need to be double-clamped. Specifically, for the battery clamping, firstly, multiple spaced positioning protrusions on the first clamping assembly need to be driven to clamp the end face of the second end of the battery, thus clamping and fixing the second end of the battery. At the same time, the second clamping assembly needs to be driven to clamp the second end. This ensures the stable fixing of the second end of the battery, and the simultaneous operation of the two fixing mechanisms also prevents mutual interference. After the battery is fixed, the sealing pin needs to be clamped. Specifically, the second clamping assembly needs to be driven to clamp the sealing pin at the injection hole, thus completing the double fixing of the battery and the sealing pin. After the battery and the sealing pin are fixed, pre-spot welding and full welding of the battery and the sealing pin are then performed.

[0063] It should be noted that before S200, driving the moving component to adjust the injection hole to the welding station, or after S300, driving the multiple spaced positioning protrusions on the first clamping component to clamp the end face of the second end of the battery, and simultaneously driving the second clamping component to clamp the second end, the process includes: S10, pre-installing the sealing pin at the injection hole.

[0064] Traditional techniques typically involve directly picking up the sealing pin and placing it into the corresponding position on the battery. However, in practice, it's difficult to guarantee the correct placement of the sealing pin, as deviations may occur during placement. Therefore, after placing the sealing pin on the battery, the positions of the battery and the sealing pin need to be readjusted, resulting in low welding precision and efficiency. This invention, by acquiring the location information of the battery's electrolyte filling hole and pre-installing the sealing pin, ensures the accurate placement of the sealing pin in the preset installation position at the electrolyte filling hole. This effectively solves the problem of inaccurate sealing pin placement and the need for continuous adjustments during battery matching in traditional techniques.

[0065] Specifically, S10, pre-installing the sealing pin at the injection hole includes:

[0066] S11. Initially pick up the sealing nail and place it in the limiting seat to adjust its position;

[0067] S12. Take the sealing pin again and place it at the injection hole.

[0068] In the technical solution provided by this invention, the sealing nail is first initially drawn into the limiting seat. The limiting seat can be provided with a limiting groove or a limiting space the same size as the sealing nail. Once the sealing nail is placed in the limiting seat, its relative position is guaranteed. Thus, when the sealing nail in the limiting seat is drawn in, the adsorption position of the adsorption component on the sealing nail is always determined. Therefore, when the sealing nail is placed in the injection hole, with the adsorption component moving along a consistent path, it is always guaranteed that the sealing nail can be placed in a fixed position in the injection hole each time, thereby ensuring the welding accuracy between the sealing nail and the battery. It should be noted that the adsorption component can be a common suction cup or a suction nail; this invention does not limit the choice.

[0069] Further, S200, obtaining the position information of the battery injection hole and driving the moving component to adjust the injection hole to the welding station includes:

[0070] S210. Based on the position information of the injection hole, rotatably adjust the position of the battery to bring the injection hole to the welding position; and / or,

[0071] S220. Adjust the position of the welding equipment according to the position information of the injection hole so that the welding station is set to correspond to the injection hole.

[0072] In the technical solution provided by this invention, the position information of the injection hole needs to be obtained first. As mentioned above, this position information can be obtained by a vision camera. After the vision camera obtains the position information of the injection hole, the program calculates the movement path of the battery or the movement path of the welding equipment, so that the injection hole is exposed under the welding station, facilitating subsequent welding. This invention provides two implementation methods. One method involves moving the battery to adjust the position of the injection hole. The moving component can be a rotating shaft or a turntable. A first clamping component pre-installs the battery on the moving component. Then, the position information of the injection hole is obtained, and the movement path of the moving component is calculated. The position of the battery is rotatably adjusted so that the injection hole is positioned under the welding station. Correspondingly, the other implementation method involves moving the position of the welding equipment. The moving component drives and connects to the welding equipment. The moving component can be a battery or a cylinder, and can be linearly driven or other movement methods. The position of the welding equipment is adjusted so that the laser head is positioned directly above the injection hole.

[0073] Furthermore, S400, driving the second clamping assembly to press the sealing pin against the injection hole includes:

[0074] S410, drive the second clamping assembly to rotate and approach the end face of the second end, so that the clearance plate of the second clamping assembly clamps the sealing nail;

[0075] When the clearance plate presses the sealing nail, the clearance plate forms a clearance space for the laser to pre-spot weld the sealing nail.

[0076] In one embodiment of the present invention, the second pressing component is configured as a clearance plate. The clearance plate can be disposed on the first pressing component or at other locations, and the present invention does not limit this. The second pressing component rotates closer to the end face of the second end, and abuts against the sealing pin during the process of approaching the end face of the second end, thereby pressing the sealing pin and making the sealing pin and the battery fit tightly together. It should be noted that a clearance space is formed on the clearance plate, which can be a clearance groove or clearance hole, etc., and the laser head can weld the sealing pin and the battery at the clearance space.

[0077] It should be noted that the first clamping component clamps and secures the battery. This first clamping component can be configured in various forms, such as a pressure plate or a pressure block. It can also approach and clamp the battery in various motions, such as moving vertically or horizontally. This invention does not limit the specific motion. It is important to note that the first clamping component has multiple spaced positioning protrusions that match the end face of the second end of the battery, thus clamping the battery. Furthermore, the first clamping component has welding grooves, allowing the positioning protrusions to be positioned circumferentially around these grooves, ensuring stable contact between the first clamping component and the battery.

[0078] Furthermore, S400, driving the second clamping assembly to press the sealing pin against the injection hole includes:

[0079] S420. Drive the second pressing component close to the end face of the second end, so that multiple spaced positioning blocks on the second pressing component press the sealing nail, and a clearance space is formed between each positioning block to allow the laser to pre-spot weld the sealing nail.

[0080] In an optional embodiment, the second clamping assembly is provided with a plurality of spaced-apart positioning blocks to clamp the periphery of the sealing nail. Thus, multiple clearance spaces are formed between the positioning blocks, allowing the laser head to weld the periphery of the sealing nail within these clearance areas, thereby improving the quality of the pre-spot welding.

[0081] Please see Figures 2-4 Based on the above-mentioned welding method for power battery sealing nails, the present invention also provides a welding device 1 for power battery sealing nails, comprising: a base 2, a rotating assembly, a first clamping assembly, a detection assembly, a first pressing assembly 3, a second pressing assembly 4, a second clamping assembly 5, and a welding mechanism. The rotating assembly is mounted on the base 2, and the first clamping assembly is rotatably mounted on the rotating assembly for clamping the first end of the battery. Specifically, the rotating assembly can be configured as a turntable or a rotating shaft, and the first clamping assembly can be configured as a clamping seat or a clamping claw. In actual operation, the battery is first clamped by the first clamping assembly, and then the position of the electrolyte injection hole on the battery is adjusted by the rotating assembly so that the electrolyte injection hole is aligned with the welding mechanism.

[0082] As mentioned earlier, after the battery is pre-installed in the first clamping assembly, the position of the liquid injection hole may deviate from that of the welding mechanism, thus requiring adjustment of the battery's position. A detection assembly, fixed to one side of the base 2, is used to detect the position information of the liquid injection hole on the second end of the battery. Based on the obtained position information, the rotating assembly can rotatably adjust the battery's position so that the liquid injection hole aligns with the welding mechanism. It should be noted that the detection assembly can be equipped with a vision camera, which determines the actual position of the liquid injection hole by taking multiple photos, and then the logic module calculates the movement path of the rotating assembly.

[0083] Referring to the above-mentioned welding method for the power battery sealing pin, after adjusting the position of the injection hole, the sealing pin needs to be pre-installed at the injection hole. In this embodiment, it is assumed that the sealing pin has already been pre-installed at the injection hole, so the pre-installation process will not be described in detail. After the sealing pin is pre-installed, the battery and the sealing pin need to be double-pressed. Specifically, the battery is first pressed using the first pressing component 3. The first pressing component 3 is slidably mounted on the base 2 and has a travel stroke that approaches and moves away from the battery. The first pressing component 3 is provided with a plurality of positioning protrusions 6 spaced apart, so as to abut and press the second end face of the battery during the travel stroke that approaches the battery, and a welding groove 8 is formed on the first pressing component 3. The positioning protrusions 6 press and fix the end face of the battery, thereby playing a stable fixing role for the battery and ensuring welding accuracy. It should be noted that the second clamping component 5 is provided on the end face of the first pressing component 3 near the first clamping component, so as to clamp and fix the side wall of the battery, so as to cooperate with the first pressing component 3 to stably clamp one end of the battery.

[0084] After the first clamping component 3 clamps and fixes the battery, the second clamping component 4 is used to clamp the sealing nail. The second clamping component 4 is rotatably mounted on the first clamping component 3 and has a travel stroke that moves towards and away from the sealing nail. During the travel stroke that moves towards the sealing nail, the second clamping component 4 clamps the sealing nail in the welding groove 8. The second clamping component 4 is moved after the first clamping component 3 clamps the battery, which reduces the travel stroke of the second clamping component 4. The second clamping component 4 can clamp the sealing nail, and the position of the sealing nail will not be affected during the clamping or moving away process.

[0085] After the first clamping component 3 and the second clamping component 4 clamp and fix the battery and the sealing nail respectively, the welding mechanism performs pre-spot welding and full welding on the sealing nail respectively.

[0086] The welding device 1 for power battery sealing nails provided by this invention features a first clamping component 3 with multiple positioning protrusions 6 that tightly fit and fix the ends of the battery. A second clamping component 4 is disposed on the first clamping component 3. The second clamping component 4 moves after the first clamping component 3 clamps the battery, reducing its travel distance. The second clamping component 4 rotates to move closer to or away from the sealing nail, clamping it without affecting its position. The first clamping component and the second clamping component 5 fix the battery at both ends axially, ensuring the battery's position and welding accuracy. The welding device 1 for power battery sealing nails provided by this invention has a simple structure and is easy to operate, significantly improving the accuracy and quality of welding the sealing nail to the battery.

[0087] Specifically, the first pressing assembly 3 includes a first driving member 12 and a pressure plate 7. The first driving member 12 is mounted on the base 2 to drive the pressure plate 7 towards or away from the end face of the battery. In this embodiment, the pressure plate 7 extends horizontally, and the base 2 is provided with a sliding groove. The pressure plate 7 is slidably connected to the base 2 by a slider that matches the sliding groove. In an optional embodiment, depending on the production line structure, a vertically extending pressure plate 7 or an obliquely extending pressure plate 7 may also be provided; this invention is not limited to this. For details, please refer to [link to relevant documentation]. Figure 4 A welding groove 8 is formed on the pressure plate 7. A guide groove 9 is formed on the side of the welding groove 8 near the battery. The guide groove 9 guides the end of the battery, facilitating the insertion of the battery and ensuring its alignment with the welding groove 8. Furthermore, a clamping plate 17 extends outward from the central axis of the end of the guide groove 9 with a smaller opening area. Multiple spaced positioning protrusions 6 are arranged around the side of the clamping plate 17 near the battery. The clamping plate 17 limits and abuts the end of the battery, while the positioning protrusions 6 press and fix the end face of the battery, thus providing stable fixation and ensuring welding accuracy. It should also be noted that a dust collection device is provided in the welding groove 8. This device forms a ring-shaped dust collection groove to absorb dust generated during the welding process, maintaining the cleanliness of the device.

[0088] Furthermore, the second clamping component 5 is mounted on the mounting plate and has a travel distance that allows it to move closer to or further away from the welding groove 8. When the pressure plate 7 clamps the battery, the second clamping component 5 simultaneously clamps the peripheral wall of the battery. The second clamping component 5 can be configured as a cylinder, etc., and is used to extend into the welding groove 8 and abut against the side wall of the battery. In this way, the first clamping component and the second clamping component 5 tightly fix both ends of the battery in the axial direction, ensuring welding accuracy. It should be noted that in the technical solution provided by this invention, the two clamping components can be configured as three-jaw cylinders. Three-jaw cylinders can perform multi-point precise clamping, further improving the stability and accuracy of clamping.

[0089] Furthermore, the second clamping assembly 4 includes a second driving member 13 and a clearance pressure plate 10 disposed on one side of the welding groove 8. The second clearance pressure plate 10 is provided with a clearance groove 11, and the second driving member 13 drives the clearance pressure plate 10 to rotate closer to or away from the sealing nail. It should be noted that, in this embodiment, the clearance pressure plate 10 is provided with a U-shaped groove, the opening of which faces the welding groove 8, and a clearance space is formed at the opening of the U-shaped groove. When the clearance pressure plate 10 clamps the sealing nail, the laser head can weld the sealing nail and the battery in the clearance space. In an optional embodiment, multiple positioning pressure blocks can also be provided to clamp the periphery of the sealing nail. The multiple positioning pressure blocks can be distributed circumferentially along the periphery of the sealing nail, and a clearance space is formed between each positioning pressure block for laser welding. Compared with the clearance pressure plate 10, the clearance space formed by the positioning pressure blocks is distributed in a ring, which is beneficial to ensure that the periphery of the sealing nail can produce a good welding effect with the battery.

[0090] Specifically, in the technical solution provided by this invention, the second driving component 13 includes a drive motor 15 and a transmission shaft 16. The transmission shaft 16 is connected to the clearance pressure plate 10, and the drive motor 15 drives the transmission shaft 16 to rotate. The cooperation between the drive motor 15 and the transmission shaft 16 makes the movement of the clearance pressure plate 10 more stable and less prone to moving the position of the sealing nail. It should be noted that in the actual welding process, it is often necessary to monitor the welding output. Therefore, in the technical solution provided by this invention, the drive motor 15 is also equipped with an encoder 14, which is electrically connected to the drive motor 15. The encoder 14 is used to sense the number of rotations of the drive motor 15 to calculate the welding output.

[0091] It should also be noted that in this embodiment, two welding stations are formed on the mounting plate to improve welding efficiency. Of course, more welding stations can be set on the mounting plate according to the actual output, and the present invention does not limit this. It should be noted that in this embodiment, two welding stations are formed, and the drive motors 15 on the two welding stations operate synchronously. This eliminates interference between the two and facilitates synchronous control, which can further improve the welding effect.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A welding device for a power battery sealing pin, used for welding a battery and a sealing pin, characterized in that, The welding device for the power battery sealing nail includes: Base; A rotating assembly is mounted on the base; The first clamping assembly is rotatably mounted on the rotating assembly and is used to clamp the first end of the battery. A detection component, fixed to one side of the base, is used to detect the position information of the liquid injection hole on the second end of the battery. The rotation component adjusts the position of the battery rotatably according to the position information. The first clamping component is slidably mounted on the base and has a travel distance to and from the battery. The first clamping component is provided with a plurality of positioning protrusions at intervals to abut against and clamp the second end face of the battery during the travel distance to the battery. The first clamping component is also provided with a welding groove. The second clamping assembly is rotatably mounted on the first clamping assembly and has a travel stroke that approaches and moves away from the sealing nail. During the travel stroke that approaches the sealing nail, the second clamping assembly clamps the sealing nail in the welding groove. The second clamping component is disposed on the end face of the first clamping component near the first clamping component, for clamping and fixing the side wall of the battery; A welding mechanism, installed above the second clamping assembly, is used to weld the sealing pin to the injection hole; The first clamping assembly includes a first driving member and a pressure plate. The first driving member is mounted on the base to drive the pressure plate closer to or away from the end face of the battery. The welding groove is formed on the pressure plate. A guide groove is formed on the side of the welding groove near the battery. A clamping plate extends outward from the central axis of the guide groove with a smaller opening area. A plurality of positioning protrusions are arranged around the side of the clamping plate near the battery. When the first driving member drives the pressure plate to approach and press the battery, one end of the battery abuts and presses against each of the positioning protrusions along the guide groove. The second clamping assembly includes a second driving member and a relief pressure plate disposed on one side of the welding groove. The relief pressure plate is provided with a relief groove. The second driving member drives the relief pressure plate to rotate closer to or away from the sealing nail.

2. The welding device for a power battery sealing nail according to claim 1, characterized in that, The second clamping assembly is mounted on the mounting plate and has a travel distance that moves towards or away from the welding groove. When the pressure plate presses the battery, the second clamping assembly simultaneously clamps the peripheral wall of the battery.

3. The welding device for a power battery sealing nail according to claim 1, characterized in that, The second drive unit is also provided with an encoder, which is electrically connected to the second drive unit and is used to sense the number of rotations of the second drive unit.

4. A welding method for a power battery sealing pin, used for welding a power battery and a sealing pin, characterized in that, The welding apparatus for the power battery sealing pin according to any one of claims 1 to 3, wherein the welding method for the power battery sealing pin includes: Drive the first clamping assembly to clamp the first end of the battery; Obtain the position information of the battery injection hole and drive the rotating component to adjust the injection hole to the welding station; The first clamping assembly is driven to press the end face of the second end of the battery by multiple spaced positioning protrusions, and the second clamping assembly is driven to clamp the second end simultaneously. Drive the second clamping assembly to press the sealing pin against the injection hole; The sealing nail and the injection hole are pre-spot welded in a pre-set welding groove; Remove the second clamping assembly and fully weld the sealing pin to the injection hole; The process includes, before driving the rotating assembly to adjust the injection hole to the welding position, or after driving the first clamping assembly to drive multiple spaced positioning protrusions on the first clamping assembly to clamp the end face of the second end of the battery, and simultaneously driving the second clamping assembly to clamp the second end, pre-installing the sealing pin at the injection hole.

5. The welding method for the power battery sealing nail according to claim 4, characterized in that, Pre-installing the sealing pin at the injection hole includes: The sealing pin is initially extracted and placed in the limiting seat for adjustment. The sealing pin is then drawn up again and placed at the injection hole.

6. The welding method for the power battery sealing nail according to claim 4, characterized in that, Driving the second clamping assembly to press the sealing pin against the injection hole includes: The second clamping assembly is driven to rotate and approach the end face of the second end, so that the clearance plate of the second clamping assembly presses against the sealing nail; When the relief plate presses the sealing nail tightly in the welding groove, the relief groove on the relief plate allows the laser to pre-spot weld the sealing nail.

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