Friction stir welding device for battery box

Abstract

The invention provides a friction stir welding device for a battery box, and belongs to the technical field of welding, the friction stir welding device comprises a welding machine body and a mounting seat, and the mounting seat is provided with a lateral clamping assembly and an outer end pressing assembly which are used for fixing two to-be-welded plates; the friction stir welding device further comprises a plurality of elastic telescopic rods, two pressing plates and two sets of automatic connecting mechanisms. The multiple elastic telescopic rods are vertically arranged at the bottom of a movable frame of the welding machine body. The two pressing plates are in sliding connection with the lower ends of the corresponding elastic telescopic rods; the two groups of automatic connecting mechanisms are in one-to-one correspondence with the two pressing plates and are used for fixing the pressing plates and the mounting seat after the bottom surfaces of the pressing plates are attached to a to-be-welded plate; when the elastic telescopic rod is in a free state, the bottom face of the pressing plate is lower than the bottom end of the welding head. The welding end of the to-be-welded plate can be pressed downwards, so that the welding end of the to-be-welded plate is more stable during welding, the change of the position of the plate caused by external force interference or vibration in the welding process is avoided, and the welding quality of the to-be-welded plate is guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of welding, and more specifically, relates to a friction stir welding apparatus for battery cases. Background Technology

[0002] During the manufacturing process of the battery box, two box panels need to be welded and fixed using friction stir welding technology. Friction stir welding refers to the use of heat generated by the friction between a high-speed rotating welding tool and the workpiece to locally melt the materials being welded. As the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear of the welding tool under the action of the rotational friction force of the welding tool, and forms a dense solid-phase weld under the pressure of the welding tool.

[0003] The existing friction stir welding equipment includes a welding machine body and a mounting base located below the welding machine body. The welding machine body includes a moving frame and a welding head mounted on the moving frame. The mounting base has a lateral clamping assembly for fixing two plates to be welded and an outer end pressing assembly. The lateral clamping assembly is used to clamp the two sides of the plates to be welded, and the outer end pressing assembly is used to press down on the end of the plates to be welded away from the weld.

[0004] When the outer end pressing component applies excessive pressure to the outer end of the plate to be welded, or when the welding head moves to weld the weld, the end of the plate to be welded located at the weld is prone to lifting or shifting. Even a slight deviation can negatively affect the welding quality. Summary of the Invention

[0005] The purpose of this application is to provide a friction stir welding device for battery boxes, so as to solve the technical problem in the prior art that the end of the plate to be welded at the weld seam is prone to warping or displacement, which even a slight one will have a negative impact on the welding quality.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a friction stir welding device for battery casings, including a welding machine body and a mounting base located below the welding machine body, wherein the mounting base is provided with a lateral clamping assembly for fixing two plates to be welded and an outer end pressing assembly; the friction stir welding device further includes: Multiple elastic telescopic rods are vertically arranged at the bottom of the movable frame of the welding machine body and located on both sides of the welding head of the welding machine body; Two pressure plates are located on both sides of the welding head and are slidably connected to the lower ends of the corresponding elastic telescopic rods. The sliding direction of the pressure plates and the elastic telescopic rods is consistent with the moving direction of the moving frame; and Two sets of automatic connection mechanisms correspond one-to-one with the two pressure plates and are used to fix the pressure plates to the mounting base after the bottom surface of the pressure plates is attached to the plate to be welded; When the elastic telescopic rod is in a free state, the bottom surface of the pressure plate is lower than the bottom end of the welding head. In one possible implementation, based on the above technical solutions, the automatic connection mechanism includes: Two connecting plates are fixed to the bottom of both ends of the pressure plate, respectively; Two connecting frames are fixed on both sides of the mounting base and are located directly below the corresponding connecting plate; the connecting frame has a connecting groove for the connecting plate to be inserted, and a receiving groove is provided on one side of the connecting groove; Multiple connecting blocks, each corresponding to a connecting slot, are slidably disposed within the receiving slot, with one end of each connecting block inserted into the connecting slot; and Two sets of drive components are disposed on the outside of the corresponding connecting frame and are used to drive one end of the corresponding connecting block to insert into or disengage from the connecting slot.

[0007] In one possible implementation, based on the above technical solutions, the bottom wall of the connecting groove and the bottom surface of the connecting block are mutually adapted inclined surfaces. When the bottom surface of the connecting block presses against the bottom wall of the connecting groove, the connecting block applies a downward force to the connecting plate.

[0008] In one possible implementation, based on the above technical solutions, the driving component includes: One end of the screw is located within the receiving groove and rotatably connected to the connecting block, while the other end of the screw extends to the outside of the connecting frame; and A driving component is disposed on the outside of the connecting frame and is used to drive the screw to rotate; The screw is threaded to the connecting frame, and one end of the connecting block is always slidably connected within the receiving groove.

[0009] In one possible implementation, based on the above technical solutions, multiple connecting slots are provided on the connecting frame, and their arrangement direction is perpendicular to the moving direction of the moving frame; the driving component includes: The drive gear is rotatably connected to the outside of the connecting frame and is connected to the screw key; A drive rack is slidably connected to the outside of the connecting frame and meshes with all the drive gears on the outside of the connecting frame; and A drive cylinder is located on the outside of the connecting block, and the piston rod of the drive cylinder is fixed to the drive rack.

[0010] In one possible implementation, based on the above technical solutions, the connecting block includes: A fixed block is slidably disposed within the receiving groove and connected to the drive assembly; An extrusion plate, inclinedly disposed at the bottom of the fixing block, is used to extrude force into the bottom wall of the connecting groove; and An elastic connector is attached between the bottom of the fixed block and the extrusion plate.

[0011] In one possible implementation, based on the above technical solutions, the elastic connector includes: Multiple connecting springs are connected between the bottom of the fixed block and the extrusion plate; and Multiple guide telescopic rods correspond one-to-one with the connecting springs and are located inside the connecting springs. The guide telescopic rods are connected between the bottom of the fixed block and the extrusion plate. The extension and retraction directions of the connecting spring and the guide telescopic rod are both perpendicular to the inclined surface at the bottom of the extrusion plate.

[0012] In one possible implementation, based on the above technical solutions, the elastic telescopic rod includes: The outer tube is fixed to the bottom of the movable frame and has an opening at the bottom; The inner plate is slidably disposed inside the outer tube at the top and slidably connected to the pressure plate at the bottom; and A compression spring is located inside the outer tube and is connected between the top wall of the outer tube and the top of the inner plate.

[0013] In one possible implementation, based on the above technical solutions, the lateral clamping assembly includes: A clamping cylinder is horizontally positioned on one side of the mounting base; Top plate, fixed to the piston rod of the clamping cylinder; and A fixing plate is fixed to the side of the mounting base opposite to the clamping cylinder; The top plate and the fixing plate are used to clamp the plate to be welded laterally.

[0014] In one possible implementation, based on the above technical solutions, the external pressing component includes: The lower cylinder is vertically disposed at the outer end of the mounting base; and The lower pressure frame is fixed on the piston rod of the lower pressure cylinder and is used to press the outer end of the plate to be welded onto the mounting base.

[0015] The beneficial effects of the friction stir welding device for battery box provided in this application are as follows: Compared with the prior art, when welding the plates to be welded, before the welding head descends to contact the weld seam, the pressure plate first contacts the plates to be welded. Through the elastic action of the elastic telescopic rod, it adaptively fits the plates to be welded and presses down on the welding end of the plates to be welded, making the welding end of the plates to be welded more stable during welding. This avoids changes in the position of the plates due to external interference or vibration during the welding process, and can promptly compensate for minor deformations or positional shifts of the plates, ensuring that the plates to be welded remain stable throughout the entire welding process, thereby guaranteeing the welding quality of the plates to be welded. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a friction stir welding device for a battery box provided in an embodiment of this application; Figure 2 A schematic diagram of the elastic telescopic rod and automatic connection mechanism provided in the embodiments of this application; Figure 3 A partial cross-sectional view of the connection block and drive assembly provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the driving component provided in an embodiment of this application.

[0018] The labels for the attached figures are as follows: 1. Welding machine body; 11. Moving frame; 12. Welding head; 2. Mounting bracket; 3. Lateral clamping assembly; 31. Clamping cylinder; 32. Top plate; 33. Fixing plate; 4. External pressing assembly; 41. Pressing cylinder; 42. Pressing frame; 5. Flexible telescopic rod; 51. Outer tube; 52. Inner plate; 6. Pressure plate; 7. Automatic connection mechanism; 71. Connecting plate; 711. Connecting groove; 72. Connecting frame; 721. Receiving groove; 73. Connecting block; 731. Fixing block; 732. Extrusion plate; 733. Elastic connector; 74. Drive assembly; 741. Screw; 742. Drive gear; 743. Drive rack; 744. Drive cylinder. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain this application and are not intended to limit this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be further noted that the accompanying drawings and embodiments of this application mainly describe the concept of this application. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of this application, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0021] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] The present application provides a description of a friction stir welding apparatus for a battery box.

[0023] like Figure 1 and Figure 2 As shown, one embodiment of this application provides a friction stir welding device for a battery box, including a welding machine body 1 and a mounting base 2 located below the welding machine body 1. The mounting base 2 is provided with a lateral clamping assembly 3 and an outer end pressing assembly 4 for fixing two plates to be welded.

[0024] The friction stir welding device also includes multiple elastic telescopic rods 5, two pressure plates 6, and two sets of automatic connection mechanisms 7; the multiple elastic telescopic rods 5 are vertically arranged at the bottom of the moving frame 11 of the welding machine body 1 and located on both sides of the welding head 12 of the welding machine body 1; the two pressure plates 6 are located on both sides of the welding head 12 respectively and are slidably connected to the lower end of the corresponding elastic telescopic rod 5, and the sliding direction of the pressure plate 6 and the elastic telescopic rod 5 is consistent with the moving direction of the moving frame 11.

[0025] Two sets of automatic connection mechanisms 7 correspond one-to-one with two pressure plates 6, and are used to fix the pressure plate 6 and the mounting base 2 after the bottom surface of the pressure plate 6 is attached to the plate to be welded; wherein, when the elastic telescopic rod 5 is in a free state, the bottom surface of the pressure plate 6 is lower than the bottom end of the welding head 12.

[0026] This embodiment provides a friction stir welding device for battery boxes. Compared with the prior art, when welding the plates to be welded, before the welding head 12 descends to contact the weld seam, the pressure plate 6 first contacts the plates to be welded. Through the elastic action of the elastic telescopic rod 5, it adaptively fits the plates to be welded and presses down on the welding end of the plates to be welded, making the welding end of the plates to be welded more stable during welding. This avoids changes in the position of the plates due to external interference or vibration during the welding process, and can promptly compensate for minor deformations or positional shifts of the plates, ensuring that the plates to be welded remain stable throughout the entire welding process, thereby guaranteeing the welding quality of the plates to be welded.

[0027] like Figures 2 to 3 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The automatic connection mechanism 7 includes two connecting plates 71, two connecting frames 72, multiple connecting blocks 73, and two sets of drive components 74; the two connecting plates 71 are respectively fixed to the bottom of both ends of the pressure plate 6; the two connecting frames 72 are respectively fixed to both sides of the mounting base 2 and located directly below the corresponding connecting plates 71; the connecting frames 72 are provided with connecting grooves 711 for the connecting plates 71 to be inserted, and a receiving groove 721 is provided on one side of the connecting grooves 711.

[0028] Multiple connecting blocks 73 correspond one-to-one with connecting slots 711 and are slidably disposed in receiving slots 721. One end of the connecting block 73 is inserted into the connecting slot 711. Two sets of driving components 74 are disposed on the outside of the corresponding connecting frame 72 and are used to drive one end of the corresponding connecting block 73 to be inserted into or detached from the connecting slot 711.

[0029] After the bottom surface of the pressure plate 6 is attached to the plate to be welded, the connecting plate 71 is inserted into the connecting groove 711. At this time, the connecting block 73 is driven by the drive component 74 to insert one end into the connecting groove 711, thus fixing the pressure plate 6 to the mounting base 2. It can effectively resist various external forces generated during the welding process, such as friction and vibration when the welding head 12 moves, and ensure that the pressure plate 6 is always tightly connected to the mounting base 2 throughout the welding process, thereby better fixing the plate to be welded.

[0030] like Figure 3 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The bottom wall of the connecting groove 711 and the bottom surface of the connecting block 73 are mutually compatible inclined surfaces. When the bottom surface of the connecting block 73 presses against the bottom wall of the connecting groove 711, the connecting block 73 applies a downward force to the connecting plate 71.

[0031] The inclined surface design allows the connecting block 73 to generate a downward component force after being inserted into the connecting groove 711. This downward force is transmitted to the pressure plate 6 through the connecting plate 71. The downward force can further strengthen the connection between the pressure plate 6 and the mounting base 2, making the pressure plate 6 fit more tightly against the plate to be welded, effectively preventing the plate to be welded from warping or shifting during the welding process.

[0032] In addition, the mutual compression of the inclined surfaces can increase the friction between the connecting block 73 and the connecting groove 711, improving the stability and reliability of the connection; it can also compensate for installation errors and minor deformations of the plate during the connection process to a certain extent, making the connection tighter and stronger.

[0033] like Figures 3 to 4 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The drive assembly 74 includes a screw 741 and a drive member; one end of the screw 741 is located in the receiving groove 721 and is rotatably connected to the connecting block 73, and the other end of the screw 741 extends to the outside of the connecting frame 72; the drive member is located on the outside of the connecting frame 72 and is used to drive the screw 741 to rotate. The screw 741 and the connecting frame 72 are threadedly connected, and one end of the connecting block 73 is always slidably connected in the receiving groove 721.

[0034] The screw 741 is driven to rotate by the drive component. The screw 741 is connected to the connecting frame 72 by a thread, which can convert the rotational motion of the screw 741 into the linear motion of the connecting block 73. This allows for precise control of the action of one end of the connecting block 73 inserting into or disengaging from the connecting groove 711. The insertion depth and connection force of the connecting block 73 can be flexibly adjusted according to actual welding requirements to ensure that the connection between the pressure plate 6 and the mounting base 2 is both firm and does not excessively compress the plate to be welded.

[0035] like Figure 4 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: Multiple connecting slots 711 are provided on the connecting frame 72, and their arrangement is perpendicular to the moving direction of the moving frame 11; the driving components include a driving gear 742, a driving rack 743, and a driving cylinder 744.

[0036] The drive gear 742 is rotatably connected to the outside of the connecting frame 72 and is keyed to the screw 741; the drive rack 743 is slidably connected to the outside of the connecting frame 72 and meshes with all the drive gears 742 on the outside of the connecting frame 72; the drive cylinder 744 is located on the outside of the connecting block 73, and the piston rod of the drive cylinder 744 is fixed to the drive rack 743.

[0037] The multiple connecting slots 711 increase the number of connection points between the pressure plate 6 and the mounting base 2, thus enabling it to be used for a variety of specific types of plates to be welded, to accommodate different weld positions.

[0038] When the drive cylinder 744 drives the drive rack 743 to move, the drive rack 743, through meshing with the drive gear 742, can simultaneously drive all the screws 741 to rotate synchronously, thereby allowing multiple connecting blocks 73 to be inserted into or disengaged from the connecting slots 711 at the same time. No matter which connecting slot 711 the pressure plate 6 is inserted into, it can be inserted and fixed by the connecting block 73, thus improving the fixing efficiency of the pressure plate 6 and the connecting plate 71.

[0039] like Figure 3 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The connecting block 73 includes a fixing block 731, a pressing plate 732, and an elastic connector 733; the fixing block 731 is slidably disposed in the receiving groove 721 and connected to the drive assembly 74; the pressing plate 732 is inclinedly disposed at the bottom of the fixing block 731 and is used to press the bottom wall of the connecting groove 711; the elastic connector 733 is connected between the bottom of the fixing block 731 and the pressing plate 732.

[0040] When the connecting block 73 is inserted into the connecting groove 711, the pressing plate 732 contacts and presses against the inner bottom wall of the connecting groove 711. The elastic connector 733 can absorb part of the impact force and avoid damage to the connecting structure due to rigid collision.

[0041] Meanwhile, the elastic connector 733 can also adapt to unevenness or slight deformation of the inner bottom wall of the connecting groove 711 to a certain extent. In actual production, due to factors such as machining precision or wear during use, the inner bottom wall of the connecting groove 711 may have some unevenness or slight deformation. The elastic deformation capability of the elastic connector 733 allows the extrusion plate 732 to better fit against the inner bottom wall of the connecting groove 711, ensuring a good fit between the connecting block 73 and the connecting groove 711.

[0042] like Figure 3 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The elastic connector 733 includes multiple connecting springs and multiple guide telescopic rods; the multiple connecting springs are connected between the bottom of the fixed block 731 and the extrusion plate 732; the multiple guide telescopic rods correspond one-to-one with the connecting springs and are located inside the connecting springs, and the guide telescopic rods are connected between the bottom of the fixed block 731 and the extrusion plate 732; wherein, the extension and retraction directions of the connecting springs and the guide telescopic rods are both perpendicular to the inclined surface of the bottom of the extrusion plate 732.

[0043] The connecting springs provide the primary elastic cushioning force, effectively absorbing the impact force when the connecting block 73 is inserted into the connecting slot 711, reducing damage to the connecting structure. The arrangement of multiple connecting springs increases the elastic cushioning capacity, enabling the elastic connector 733 to better cope with impact forces of varying magnitudes.

[0044] The guide telescopic rod serves as a guide and support, ensuring that the extrusion plate 732 remains stable when it is extruding the bottom wall of the connecting groove 711, and preventing tilting or deviation. Furthermore, the extension and retraction direction of the guide telescopic rod is perpendicular to the inclined surface at the bottom of the extrusion plate 732, so that the elastic connector 733 can extend and retract in the correct direction when subjected to force, ensuring the working efficiency and stability of the elastic connector 733.

[0045] like Figure 2 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The elastic telescopic rod 5 includes an outer tube 51, an inner plate 52, and a compression spring (not shown in the figure); the outer tube 51 is fixed to the bottom of the movable frame 11 and has an opening at the bottom; the top of the inner plate 52 is slidably disposed inside the outer tube 51, and the bottom is slidably connected to the pressure plate 6; the compression spring is located inside the outer tube 51 and is connected between the inner top wall of the outer tube 51 and the top of the inner plate 52.

[0046] Furthermore, in this embodiment, a pulley can be installed at the bottom of the inner plate 52, and a groove can be opened on the top surface of the pressure plate 6 for the pulley to slide in, thereby improving the smoothness of the sliding of the elastic telescopic rod 5 on the pressure plate 6.

[0047] Before the welding head 12 descends to the weld seam, the pressure plate 6 first adheres to the plate to be welded. As the welding head 12 continues to descend, the compression spring compresses to apply a downward force to the plate to be welded on the pressure plate 6. Furthermore, as the welding head 12 moves along the weld seam direction, the elastic telescopic rod 5 slides on the pressure plate 6 following the welding head 12, ensuring that the plate to be welded is always subjected to a more precise force at the welding point of the welding head 12, thereby improving the welding effect.

[0048] like Figure 2 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The lateral clamping assembly 3 includes a clamping cylinder 31, a top plate 32, and a fixing plate 33. The clamping cylinder 31 is laterally disposed on one side of the mounting base 2. The top plate 32 is fixed on the piston rod of the clamping cylinder 31. The fixing plate 33 is fixed on the side of the mounting base 2 away from the clamping cylinder 31. The top plate 32 and the fixing plate 33 are used to clamp the plate to be welded laterally.

[0049] The lateral clamping assembly 3, through the extension and retraction of the piston rod of the clamping cylinder 31, drives the top plate 32 to move towards the fixed plate 33, thereby clamping the plate to be welded between the top plate 32 and the fixed plate 33; it can provide sufficient clamping force to resist various external forces generated during the welding process and ensure the stability of the plate to be welded in the lateral direction.

[0050] like Figure 2 As shown, this application provides another specific implementation method based on the above-described implementation method as follows: The outer end pressing assembly 4 includes a pressing cylinder 41 and a pressing frame 42; the pressing cylinder 41 is vertically arranged at the outer end of the mounting base 2; the pressing frame 42 is fixed on the piston rod of the pressing cylinder 41 and is used to press the outer end of the plate to be welded onto the mounting base 2.

[0051] The extension and retraction of the piston rod of the lower cylinder 41 drives the lower pressure frame 42 to move downward, firmly pressing the outer end of the plate to be welded onto the mounting base 2; it can provide sufficient pressure to the outer end of the plate to be welded to resist various upward forces generated during the welding process, and ensure that the outer end of the plate to be welded maintains a stable position throughout the welding process.

[0052] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A friction stir welding apparatus for a battery box, comprising a welding machine body (1) and a mounting base (2) located below the welding machine body (1), wherein the mounting base (2) is provided with a lateral clamping assembly (3) for fixing two plates to be welded and an outer end pressing assembly (4); characterized in that, The friction stir welding apparatus also includes: Multiple elastic telescopic rods (5) are vertically arranged at the bottom of the movable frame (11) of the welding machine body (1) and located on both sides of the welding head (12) of the welding machine body (1); Two pressure plates (6) are located on both sides of the welding head (12) and are slidably connected to the lower ends of the corresponding elastic telescopic rods (5). The sliding direction of the pressure plates (6) and the elastic telescopic rods (5) is consistent with the moving direction of the moving frame (11); and Two sets of automatic connection mechanisms (7) correspond one-to-one with the two pressure plates (6) and are used to fix the pressure plate (6) to the mounting base (2) after the bottom surface of the pressure plate (6) is attached to the plate to be welded; When the elastic telescopic rod (5) is in a free state, the bottom surface of the pressure plate (6) is lower than the bottom end of the welding head (12).

2. The friction stir welding apparatus for a battery case as described in claim 1, characterized in that, The automatic connection mechanism (7) includes: Two connecting plates (71) are fixed to the bottom of both ends of the pressure plate (6); Two connecting frames (72) are fixed on both sides of the mounting base (2) and located directly below the corresponding connecting plate (71); the connecting frame (72) is provided with a connecting groove (711) for the connecting plate (71) to be inserted, and a receiving groove (721) is provided on one side of the connecting groove (711). Multiple connecting blocks (73), corresponding one-to-one with the connecting grooves (711), are slidably disposed within the receiving groove (721), and each connecting block (73) is used to insert one end into the connecting groove (711); and Two sets of drive components (74) are disposed on the outside of the corresponding connecting frame (72) and are used to drive one end of the corresponding connecting block (73) to insert into or disengage from the connecting groove (711).

3. The friction stir welding apparatus for a battery case as described in claim 2, characterized in that, The bottom wall of the connecting groove (711) and the bottom surface of the connecting block (73) are mutually compatible inclined surfaces. When the bottom surface of the connecting block (73) presses against the bottom wall of the connecting groove (711), the connecting block (73) applies a downward force to the connecting plate (71).

4. The friction stir welding apparatus for a battery case as described in claim 3, characterized in that, The driving component (74) includes: A screw (741), one end of which is located within the receiving groove (721) and rotatably connected to the connecting block (73), and the other end of which extends to the outside of the connecting frame (72); and A driving component is disposed outside the connecting frame (72) and is used to drive the screw (741) to rotate; The screw (741) and the connecting frame (72) are threaded together, and one end of the connecting block (73) is always slidably connected in the receiving groove (721).

5. The friction stir welding apparatus for a battery case as described in claim 4, characterized in that, Multiple connecting slots (711) are provided on the connecting frame (72), and their arrangement direction is perpendicular to the moving direction of the moving frame (11); the driving component includes: The drive gear (742) is rotatably connected to the outside of the connecting frame (72) and keyed to the screw (741); A drive rack (743) is slidably connected to the outside of the connecting frame (72) and meshes with all the drive gears (742) on the outside of the connecting frame (72); and A drive cylinder (744) is located outside the connecting block (73), and the piston rod of the drive cylinder (744) is fixed to the drive rack (743).

6. The friction stir welding apparatus for a battery case as described in claim 3, characterized in that, The connecting block (73) includes: The fixing block (731) is slidably disposed in the receiving groove (721) and connected to the drive assembly (74). An extrusion plate (732) is obliquely disposed at the bottom of the fixing block (731) and is used to extrude the inner bottom wall of the connecting groove (711); and An elastic connector (733) is connected between the bottom of the fixed block (731) and the extrusion plate (732).

7. The friction stir welding apparatus for a battery case as described in claim 6, characterized in that, The elastic connector (733) includes: Multiple connecting springs are connected between the bottom of the fixed block (731) and the compression plate (732); and Multiple guide telescopic rods correspond one-to-one with the connecting springs and are located inside the connecting springs. The guide telescopic rods are connected between the bottom of the fixed block (731) and the extrusion plate (732). The extension and retraction directions of the connecting spring and the guide telescopic rod are both perpendicular to the inclined surface at the bottom of the extrusion plate (732).

8. The friction stir welding apparatus for a battery case as described in claim 1, characterized in that, The elastic telescopic rod (5) includes: The outer tube (51) is fixed to the bottom of the movable frame (11) and has an opening at the bottom; The inner plate (52) is slidably disposed at the top inside the outer tube (51) and slidably connected at the bottom to the pressure plate (6); and A compression spring is located inside the outer tube (51) and is connected between the top wall of the outer tube (51) and the top of the inner plate (52).

9. The friction stir welding apparatus for a battery case as described in claim 1, characterized in that, The lateral clamping assembly (3) includes: A clamping cylinder (31) is arranged laterally on one side of the mounting base (2); Top plate (32), fixed to the piston rod of the clamping cylinder (31); and A fixing plate (33) is fixed to the side of the mounting base (2) away from the clamping cylinder (31); The top plate (32) and the fixing plate (33) are used to clamp the plate to be welded laterally.

10. The friction stir welding apparatus for a battery case as described in claim 1, characterized in that, The external end pressing assembly (4) includes: The lower cylinder (41) is vertically disposed at the outer end of the mounting base (2); and The lower pressure frame (42) is fixed on the piston rod of the lower pressure cylinder (41) and is used to press the outer end of the plate to be welded onto the mounting base (2).

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