Automatic welding device for battery connecting aluminum bar

Abstract

The present application relates to battery aluminum row welding technical field, specifically is a kind of battery connection aluminum row automatic welding device, including base and the portal frame fixed in the top of base both ends, beam is installed between two portal frames, base top is fixedly provided with bracket and the side frame located in the outer side of bracket, welding part is slidably installed on beam, wherein, welding part includes sliding seat slidably installed on beam, cylinder is fixedly installed in the side of sliding seat, the telescopic end of cylinder is fixedly connected with steering mechanism, the lower end of steering mechanism is fixedly connected with horizontal plate, horizontal plate bottom both ends are fixedly installed with welding mechanism, and correction mechanism is fixed in the middle of horizontal plate bottom between two welding mechanisms, two welding mechanisms are used to constitute double-point welding area, steering mechanism is used to adjust the welding direction of double-point welding area at two welding processing stations.The present application can realize the parallel operation mode of one side welding, one side feeding and discharging, realize continuous production, and weld is uniform, and welding strength is high.

Description

Technical Field

[0001] This invention relates to the field of battery aluminum busbar welding technology, specifically an automatic welding device for battery connection aluminum busbars. Background Technology

[0002] With the rapid development of the new energy power battery industry, the large-scale production of square aluminum-cased cells has placed higher demands on PACK assembly efficiency, welding consistency, and operational reliability. Welding the battery connecting aluminum busbars to the electrode cores is a core process in PACK assembly, directly determining the battery pack's conductivity, vibration resistance life, and thermal safety performance. Currently, the industry widely uses laser welding technology to connect the battery connecting aluminum busbars to the electrode cores, which has advantages such as a small heat-affected zone, high welding precision, and ease of automation.

[0003] In the prior art, such as the application document with application number CN120326148B, a laser welding equipment for assembling energy storage power supplies is disclosed. This welding equipment can use two positioning pressure plates to simultaneously pressurize the contact points between the electrode connecting piece and the two electrodes, thereby achieving synchronous positioning on both sides. In subsequent welding, the welding position can be switched by the operation of the rotating mechanism.

[0004] However, the welding equipment mentioned in the above patent only supports single-head welding operations, has low welding efficiency, and is only suitable for welding circumferential welds. If it is directly replaced by a processing circumferential weld, rigid interference and jamming impact are likely to occur at the corner position, which will lead to defects such as uneven weld and weld beads at the corner. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic welding device for aluminum busbars connecting batteries, so as to solve the problems in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions: An automatic welding device for battery connection aluminum busbars includes: The frame includes a base and gantry frames fixed at both ends of the top of the base. A crossbeam is installed between the two gantry frames. A support and a side frame located outside the support are fixed on the top of the base. A pad is attached to the top of the support. The side frame is used to divide the pad installed on the support into two welding processing stations. The welding section includes a slide block slidably mounted on a crossbeam. A cylinder is fixedly mounted on one side of the slide block. A steering mechanism is fixedly connected to the telescopic end of the cylinder. A cross plate is fixedly connected to the lower end of the steering mechanism. Welding mechanisms are fixedly mounted at both ends of the bottom of the cross plate. A correction mechanism is fixedly located at the middle of the bottom of the cross plate between the two welding mechanisms. The two welding mechanisms are used to form a double-point welding area. The steering mechanism is used to adjust the welding direction of the double-point welding area at the two welding processing stations.

[0007] In a preferred embodiment of the automatic welding device of the present invention, the side frame consists of two L-shaped side blocks fixed to the top of the base and an L-shaped connecting plate that connects the two L-shaped side blocks. The two L-shaped side blocks are respectively placed at one of the adjacent right-angled sides of the support.

[0008] As a preferred embodiment of the automatic welding device of the present invention, the steering mechanism includes a fixed plate, a connecting column 1 fixedly connected to the telescopic end of the cylinder is installed on the top of the fixed plate, four fasteners are provided on the circumferential side of the fixed plate in a ring, a cover frame for limiting the four fasteners is movably sleeved on the outside of the connecting column 1, two connecting columns 1 are provided to prevent the cover frame from swaying, and a spring 2 is fixedly connected between the inner side of the cover frame and the fixed plate.

[0009] As a preferred embodiment of the automatic welding device of the present invention, the steering mechanism further includes a moving plate and a connecting column two that is fixedly connected to the moving plate and the cross plate. The moving plate has an annular groove on its circumferential side and a recessed cavity on its top. A gear ring is fixedly provided on the side of the recessed cavity. A rotating shaft is mounted on the top of the fixed plate through a bearing in a through-rotation manner. A gear that meshes with the gear ring is fixedly connected to one end of the rotating shaft that extends into the recessed cavity.

[0010] As a preferred embodiment of the automatic welding device of the present invention, the fastener includes a slide rail opened on the circumferential side of the fixed plate, an L-shaped slide table is slidably installed inside the slide rail, a spring is fixedly connected between the horizontal section of the L-shaped slide table and the inner wall of the slide rail, and a protruding post is fixedly provided at the bottom of the inner side of the vertical section of the L-shaped slide table and slidably connected inside the annular groove.

[0011] As a preferred embodiment of the automatic welding device of the present invention, the welding mechanism includes a rectangular frame and a square column arranged concentrically. A vertical rod is fixedly connected between the four corners of the top of the rectangular frame and the horizontal plate. A vertical rod is fixedly connected between the center of the top of the square column and the horizontal plate. A cross plate is fixedly sleeved in the middle between the vertical rod and the four vertical rods. The cross plate is used to maintain the stability of the square annular channel formed between the rectangular frame and the square column.

[0012] As a preferred embodiment of the automatic welding device of the present invention, the welding mechanism further includes a swing seat rotatably sleeved on the outside of the second vertical rod via a bearing. A seat block is movably inserted into one end of the swing seat. A spring three is fixedly connected between the seat block and the swing seat. A bearing seat is rotatably mounted on the seat block via a rotary joint. An installation column extending into the square annular channel is fixedly provided at the bottom end of the bearing seat. Multiple cylindrical rollers evenly distributed in a ring are rolled and embedded on the circumferential side of the installation column. Guide corner blocks are fixedly sleeved on the bottom ends of the outer sides of the four vertical rods to guide the bearing seat to smoothly transition at the corners of the square annular channel.

[0013] In a preferred embodiment of the automatic welding device of the present invention, a lever plate is rotatably connected to the outer side of the second vertical rod via a bearing, and a drive assembly for driving the lever plate to rotate circumferentially around the second vertical rod is fixedly installed on the top of the square column. The lever plate is used to move the bearing seat along the square annular groove.

[0014] As a preferred embodiment of the automatic welding device of the present invention, the correction mechanism includes a U-shaped seat, a connecting column three is fixedly provided between the top of the U-shaped seat and the horizontal plate, and the inner sides of both ends of the U-shaped seat are inclined. A cross groove is provided on both sides of the middle of the inner cavity of the U-shaped seat. A cross block is slidably connected inside the two cross grooves. A reset spring is fixedly provided between the opposite ends of the two cross blocks and the inner wall of the corresponding cross groove. A side plate is fixedly connected to the opposite ends of the two cross blocks. A wedge block one is fixedly provided on the opposite side of the two side plates. A through groove is provided on the two wedge blocks one.

[0015] As a preferred embodiment of the automatic welding device of the present invention, the correction mechanism further includes movable blocks located at both ends of the U-shaped seat. The ends of the two movable blocks on opposite sides near the U-shaped seat are inclined, and T-shaped grooves are opened at both ends of the opposite sides of the two movable blocks. A connecting member is provided between the two T-shaped grooves that are arranged in a corresponding manner and passes through the corresponding groove. A wedge block is fixedly provided in the middle of the opposite sides of the two movable blocks. The connector includes two round rods and a spring fixed between the opposite ends of the two round rods. Each of the two round rods has a T-shaped block fixedly attached to the opposite end and slidably connected inside the corresponding T-shaped groove.

[0016] The beneficial effects of this invention are: 1. This invention uses a dual welding mechanism to form a synchronous dual-point welding zone, which allows the laser welding of two electrode cores and connecting aluminum busbars to be completed simultaneously in a single descent. Combined with dual welding processing stations, it realizes a parallel operation mode of laser welding on one side and loading and unloading on the other side, completely eliminating equipment waiting time, improving laser welding efficiency, and realizing continuous production. 2. This invention adopts a mechanically guided square ring track structure for the welding mechanism. Through the combined design of radial telescopic buffer, rotary hinge pair, rolling cylindrical roller and corner guide block, it eliminates rigid interference and jamming impact at the corner of the square ring groove from the kinematic source, ensuring that the welding head runs smoothly and at a constant speed throughout the process, ensuring uniform weld penetration, no broken welds or incomplete welds, no weld beads at the corners, and improving welding strength. 3. This invention, through the integrated gear ring drive steering mechanism, can quickly adjust the overall layout direction of the double-point welding area, and, in conjunction with the fastener locking structure, achieve angle fixation during the welding process, simplifying the equipment debugging process; 4. By setting up a wedge-shaped linkage correction mechanism, the aluminum busbar and the electrode core are automatically aligned simultaneously during the welding descent process. This can effectively offset the pre-assembly tolerance of the workpiece, ensure that the square annular weld is concentric with the electrode core, and eliminate the problem of excessive contact resistance caused by misaligned welding or incomplete welding. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention from a first-view perspective; Figure 2 This is a schematic diagram of the overall structure of the invention from a second perspective; Figure 3 This is a first-view structural schematic diagram of the welding part of the present invention; Figure 4 This is a schematic diagram of the welding part of the present invention from a second perspective; Figure 5 This is a partial structural diagram of the welded part of the present invention; Figure 6 This is a first-view unfolded structural diagram of the steering mechanism of the present invention; Figure 7 This is a schematic diagram of the second-view unfolded structure of the steering mechanism of the present invention; Figure 8 This is a schematic diagram of the cooperation between the cover frame and the L-shaped slide of the steering mechanism of the present invention; Figure 9 This is a first-view structural schematic diagram of the welding mechanism of the present invention; Figure 10 This is a second-view structural schematic diagram of the welding mechanism of the present invention; Figure 11 This is a schematic diagram of the correction mechanism structure of the present invention; Figure 12 This is a schematic diagram of the finished product after the aluminum busbars of the battery pack of the present invention have been welded and connected; Figure 13 This is a schematic diagram of the structure of the aluminum busbar connecting the battery of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1. Base; 2. Support; 3. Side frame; 4. Pad; 5. Gantry frame; 6. Crossbeam; 7. Welding part; 71. Slide; 72. Cylinder; 73. Steering mechanism; 731. Fixed plate; 732. Connecting column one; 733. Cover frame; 734. Slide rail; 735. L-shaped slide; 736. Spring one; 737. Protruding column; 738. Rotating shaft; 739. Gear; 7310. Moving plate; 7311. Ring groove; 7312. Gear ring; 7313. Connecting column two; 7314. Spring two; 74. Cross plate; 75. Welding mechanism; 751. Rectangular frame; 752. Square column; 7 53. Vertical rod one; 754. Vertical rod two; 755. Cross plate; 756. Swing seat; 757. Spring three; 758. Seat block; 759. Bearing seat; 7510. Mounting column; 7511. Guide corner block; 7512. Paddle plate; 7513. Drive assembly; 76. Correction mechanism; 761. Connecting column three; 762. U-shaped seat; 763. Cross groove; 764. Cross block; 765. Side plate; 766. Wedge block one; 767. Through groove; 768. Round rod; 769. T-block; 7610. Spring four; 7611. Moving block; 7612. T-groove; 7613. Wedge block two. Detailed Implementation

[0020] 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.

[0021] The welding device of the present invention belongs to the intelligent welding system in the intelligent manufacturing equipment industry, and is also a part of the power battery automated production equipment in the new energy vehicle industry. It is used to continuously and automatically press, position, correct and weld square battery cell modules and busbars to be welded, realizing circular trajectory laser welding operation. Example

[0022] Refer to the instruction manual appendix Figures 1-4 This embodiment is the first embodiment of the present invention, providing an automatic welding device for battery connection aluminum busbars. The automatic welding device mainly consists of two parts: a frame and a welding section 7, as detailed below: The frame includes a horizontally arranged base 1. Gantry frames 5 are fixed at both ends of the top of the base 1. A crossbeam 6 is installed horizontally between the two gantry frames 5. The crossbeam 6 provides a bearing reference for the lateral movement of the welding part 7. A support 2 is fixedly installed in the middle of the top surface of the base 1. A side frame 3 is installed on the outside of the support 2. A pad 4 overlaps on the top surface of the support 2. The side frame 3 consists of two L-shaped side blocks fixed to the top of the base 1 and an L-shaped connecting plate fixedly connecting the two L-shaped side blocks. The two L-shaped side blocks are placed at one of the adjacent right-angle sides of the support 2 to limit the pad 4 and the workpiece on the pad 4 at right angles. At the same time, the top area of ​​the pad 4 is divided into two independent welding processing stations, which can realize the parallel operation of welding on one side and loading and unloading on the other side, eliminating the waiting window of the equipment. The welding section 7 includes a slide block 71 slidably mounted on the crossbeam 6. The slide block 71 can move laterally along the length of the crossbeam 6 to switch between different welding positions. A cylinder 72 is vertically fixedly mounted on one side of the slide block 71. The telescopic end of the cylinder 72 is set downwards and is fixedly connected to a steering mechanism 73. The lower end of the steering mechanism 73 is fixedly connected to a horizontally arranged cross plate 74. Welding mechanisms 75 are fixedly mounted on both the left and right ends of the bottom of the cross plate 74. A correction mechanism 76 is provided between the two welding mechanisms 75. The correction mechanism 76 is fixedly installed at the bottom center of the cross plate 74.

[0023] It should be noted that the present invention utilizes two welding mechanisms 75 to jointly form a double-point welding area, which can simultaneously complete the welding operation between the two electrode core columns and the connecting aluminum busbar. The steering mechanism 73 is used to drive the horizontal plate 74 to rotate around the vertical axis, thereby adjusting the overall arrangement direction of the double-point welding area to adapt to the different electrode column arrangement positions of the two welding stations. The correction mechanism 76 is used to automatically center and correct the connecting aluminum busbar and the electrode core column in advance during the synchronous descent with the welding mechanism 75, ensuring that the weld points are concentric.

[0024] In addition, in this embodiment, the automatic welding device for connecting aluminum busbars of batteries is also equipped with a battery pack welding fixture, which is not shown in the accompanying drawings. The welding fixture adopts a conventional and common structure in the prior art, such as a side elastic limit block and a pneumatic clamping mechanism, which will not be described in detail here. Example

[0025] Refer to the instruction manual appendix Figures 5-8 This embodiment is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the steering mechanism 73 includes a fixed plate 731 and a moving plate 7310 arranged coaxially. Two connecting columns 732 are fixedly installed on the top of the fixed plate 731. The top ends of the two connecting columns 732 are fixedly connected to the telescopic end of the cylinder 72 to achieve relative fixation between the fixed plate 731 and the cylinder.

[0026] The fixed plate 731 is configured as a stepped structure, and four evenly distributed slide rails 734 are provided on the circumferential side of the fixed plate 731. An L-shaped slide table 735 is slidably installed in each slide rail 734. A spring 736 is fixedly connected between the horizontal section of the L-shaped slide table 735 and the inner wall of the slide rail 734. The spring 736 provides an outward radial preload for the L-shaped slide table 735. A protruding post 737 is fixedly provided at the bottom inner side of the vertical section of the L-shaped slide table 735. The moving plate 7310 has a continuous annular groove 7311 on its circumferential side. The protrusions 737 on the four L-shaped slides 735 are all slidably embedded in the annular groove 7311, which not only achieves axial positioning between the moving plate 7310 and the fixed plate 731, but also does not restrict their relative rotation.

[0027] A cover frame 733 is movably fitted onto the outer sides of two connecting columns 732. The double connecting column structure prevents the cover frame 733 from swaying during lifting and lowering. A centrally located spring 7314 is fixedly connected between the inner top surface of the cover frame 733 and the top surface of the fixed plate 731. The elastic coefficient of the spring 7314 is greater than that of the spring 736. The spring 7314 provides a downward preload to the cover frame 733. A right-angled trapezoidal block is integrally formed on the inner side of the cover frame 733 at the position corresponding to each L-shaped slide 735, and a wedge-shaped platform corresponding to the right-angled trapezoidal block is fixed on the top of the L-shaped slide 735. When the cover frame 733... When the spring 7314 is pressed down by the downward preload, the inclined surface on the inner right-angled trapezoidal block will squeeze the inclined surface on the corresponding wedge platform, so as to simultaneously push the four L-shaped slides 735 to retract inward, so that the protrusion 737 is inserted into the annular groove 7311, completing the docking and fastening between the fixed plate 731 and the moving plate 7310. Conversely, when the control cover frame 733 moves upward to release the constraint, the moving plate 7310 can rotate freely, and the outward-moving L-shaped slides 735 will drive the corresponding protrusion 737 to disengage from the annular groove 7311, completing the disengagement between the fixed plate 731 and the moving plate 7310, which is convenient for replacing the welding mechanism 75 according to subsequent production needs.

[0028] The top of the moving plate 7310 has a recessed cavity, and a gear ring 7312 is fixedly installed on the side wall of the recessed cavity. The gear ring 7312 and the moving plate 7310 cooperate to form a stepped annular cavity, which is adapted to the stepped structure of the fixed plate 731. The eccentric position of the fixed plate 731 is equipped with a rotating shaft 738 through a bearing. The rotating shaft 738 is driven to rotate by a servo motor (model JSMA-PUC02D) fixedly installed on the top of the cover frame 733. Since the cover frame 733 has a certain vertical lifting range, the output shaft end of the servo motor and the rotating shaft 738 are... For the movable insertion setting, a rectangular slot is opened at the upper end of the rotating shaft 738, and a rectangular block is fixedly connected to the end of the output shaft of the servo motor and is movably inserted into the rectangular slot. During the elastic deformation of the second spring 7314, the rectangular block always remains in the inserted state with the rectangular slot. The lower end of the rotating shaft 738 extends into the cavity, and a gear 739 is fixedly connected to the end. The gear 739 meshes with the gear ring 7312. Two connecting posts 7313 are fixedly installed at the bottom of the moving plate 7310, and the bottom end of the connecting posts 7313 is fixedly connected to the horizontal plate 74.

[0029] It should be noted that after welding at one station is completed and welding mechanism 75 transitions to another welding station, the orientation of the dual welding area changes. Therefore, the orientation of the dual welding area needs to be adjusted. The specific process is as follows: A servo motor mounted on the top of the cover frame 733 drives the rotating shaft 738 to rotate. Through the meshing transmission of gear 739 and gear ring 7312, the moving plate 7310 rotates 90° relative to the fixed plate 731 around the vertical axis. Then, through the connecting column 7313, the horizontal plate 74 and the two welding mechanisms 75 below it are driven to deflect synchronously, realizing the orientation adjustment of the double-point welding area to adapt to the pole column arrangement of different work positions. After the adjustment is in place, the servo motor is turned off, and the stationary gear 739 is used to lock the gear ring 7312, so that the moving plate 7310 does not rotate. Example

[0030] Refer to the instruction manual appendix Figure 9 , Figure 10 This embodiment is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the welding mechanism 75 is used to generate a square annular welding trajectory, which is suitable for the ring welding requirements of square electrode core columns. It mainly includes a rectangular frame 751 and a square column 752 arranged concentrically. Vertical rods 753 are fixedly connected between the four corners of the top of the rectangular frame 751 and the bottom surface of the horizontal plate 74. Vertical rods 754 are fixedly connected between the top center of the square column 752 and the bottom surface of the horizontal plate 74. A cross plate 755 is fixedly sleeved between the vertical rods 754 and the middle of the four vertical rods 753 to maintain the relative position stability of the rectangular frame 751 and the square column 752, ensure the rigidity of the square annular channel structure formed between them, and avoid deformation during welding operation.

[0031] Furthermore, a swing seat 756 and a lever plate 7512 are rotatably connected to the outer side of the second vertical rod 754 via bearings. The swing seat 756 is located above the lever plate 7512. A drive assembly 7513 is fixedly installed on the top of the square column 752. The output end of the drive assembly 7513 is connected to the lever plate 7512 for driving the lever plate 7512 to rotate circumferentially around the second vertical rod 754. The drive assembly 7513 is fixed to the base on the top of the square column 752. A drive motor (model R380) is fixedly installed on one side of the base. A main bevel gear is fixedly connected to the end of the output shaft of the drive motor. A secondary bevel gear fixed to the bottom of the lever plate 7512 is movably sleeved on the second vertical rod 754. The main bevel gear and the secondary bevel gear mesh with each other.

[0032] Furthermore, a seat block 758 is movably inserted into one end of the swing base 756. The swing base 756 is configured with a U-shaped structure, and insertion cavities are opened at both ends of the U-shaped swing base 756. The end of the seat block 758 facing the swing base 756 has two square seats that are movably inserted into the corresponding insertion cavities. A spring 757 is fixedly connected between the end of the seat block 758 facing the swing base 756 and the middle of the inner side of the swing base 756, so that the seat block 758 can radially extend and retract relative to the swing base 756. During the elastic deformation of the spring 757, the square seats always remain inserted into the corresponding insertion cavities. The spring 757 provides radial preload and buffering effect. A bearing seat 759 is rotatably installed on the outer end of the seat block 758 through a rotating joint on the vertical axis. The bearing seat 759 can freely deflect relative to the seat block 758 around the vertical axis, releasing rotational freedom.

[0033] Furthermore, a mounting post 7510 is fixedly provided at the bottom of the support 759. The mounting post 7510 extends downward into the square annular channel formed between the rectangular frame 751 and the square post 752. Multiple cylindrical rollers evenly distributed in a ring are rolled and embedded on the circumferential side of the mounting post 7510. The cylindrical rollers roll in contact with the inner wall of the square annular channel, converting sliding friction into rolling friction, which greatly reduces running resistance and wear. Guide corner blocks 7511 are fixedly sleeved on the outer bottom of the four vertical rods 753, corresponding to the square annular channel. At the four corners of the channel, the inner side is a smoothly transitioning arc guide surface. The two ends of the extended surfaces of the four arc guide surfaces close together to form a circular trajectory. The movement trajectory of the bearing seat 759 at the four corners in the square annular channel coincides with the aforementioned circular trajectory. The bearing seat 759 can be guided to smoothly change direction at the corners by the cooperation of the guide corner block 7511, the rotating pair connecting the bearing seat 759 and the seat block 758, and the cylindrical rollers that are rolled and embedded on the outside of the mounting column 7510, so as to avoid the situation of jamming at the corners and excessive wear of the mounting column 7510.

[0034] In addition, the laser welding head used for welding is set at the bottom end of the mounting column 7510, so that it can follow a continuous square annular welding trajectory as it moves along the square annular channel with the bearing seat 759.

[0035] It should be noted that the lower ends of the rectangular frames 751 and the square columns 752 on the two welding mechanisms 75 are horizontally coplanar, and an air extraction hole is opened on the upper inner side of each rectangular frame 751. During the welding process between the connecting aluminum busbar and the electrode core column, the cylinder 72 pushes the two welding mechanisms 75 to move downwards synchronously, so that the rectangular frames 751 and the square columns 752 on the two welding mechanisms 75 are tightly pressed against the aluminum busbar to be welded (e.g., ...). Figure 13 As shown, the upper sides at both ends can isolate the trajectory where the welding area is located, ensure that the connecting aluminum busbar corresponding to the welding area is in close contact with the electrode core column, and at the same time, prevent the fumes generated during the welding process from escaping into the working environment and avoid the occurrence of loose connections. After the connecting aluminum strip is pressed into the welding area of ​​the electrode core column, the drive assembly 7513 drives the dial plate 7512 to rotate circumferentially, so that the rotating dial plate 7512 moves the bearing seat 759 along the square annular channel and drives the swing seat 756 to make a circular motion around the vertical rod 754. At the same time, the mounting column 7510 moves synchronously and continuously along the square annular channel. During the movement of the mounting column 7510 along the straight edge of the square annular channel, the bearing seat 759 also moves along the straight edge of the square annular channel. At this time, the spring 757 maintains radial preload, causing the cylindrical roller on the mounting column 7510 to roll tightly against the channel wall, resulting in low running resistance and uniform speed, thus ensuring consistent weld penetration. When the mounting post 7510 transitions at the corner of the square annular channel, the channel direction deflects after the mounting post 7510 enters the channel. During this process, the bearing seat 759 adaptively deflects relative to the seat block 758 through the rotary joint to compensate for the angle difference caused by the trajectory deflection. At the same time, the arc surface of the guide corner block 7511 provides smooth guidance for the mounting post 7510, eliminating rigid interference from the kinematic root. Furthermore, during the movement of the mounting post 7510 along the square annular channel, the spring 757 adaptively expands and contracts with the radial distance, absorbing the instantaneous impact caused by the trajectory deviation. Thus, through the combination of multiple structures such as radial expansion and contraction buffering, rotational hinge releasing degrees of freedom, rolling friction reducing wear, and corner arc guidance, the problems of corner jamming and rigid impact in traditional square annular channels are completely solved, achieving uniform and stable operation throughout the process, ensuring that the square annular weld is formed evenly and without broken or incomplete welds. Example

[0036] Refer to the instruction manual appendix Figure 11This embodiment is the fourth embodiment of the present invention. The difference between this embodiment and the third embodiment is that the correction mechanism 76 is used to automatically align the connecting aluminum busbar and the electrode core column before welding to ensure that the welding trajectory is concentric with the electrode column. The correction mechanism 76 includes a U-shaped seat 762. A connecting column 761 is fixed between the top of the U-shaped seat 762 and the bottom surface of the horizontal plate 74 to realize the synchronous lifting and lowering of the correction mechanism and the horizontal plate. The inner sides of both ends of the U-shaped seat 762 are inclined guide surfaces to facilitate the introduction of workpieces. The U-shaped seat 762 has cross grooves 763 on both sides of the middle of its inner cavity. Cross blocks 764 are slidably connected in both cross grooves 763. A return spring is fixedly installed between the opposite ends of the two cross blocks 764 and the inner wall of the corresponding cross groove 763. A side plate 765 is fixedly connected to the opposite ends of the two cross blocks 764. A wedge block 766 is fixedly installed on the opposite side of the two side plates 765. A through groove 767 is opened through the wedge block 766 in the horizontal direction. The U-shaped seat 762 has movable blocks 7611 at both ends. The inner ends of the opposite sides of the two movable blocks 7611 are inclined and adapted to the inclined guide surface of the U-shaped seat 762. T-slots 7612 are opened at both ends of the opposite sides of the two movable blocks 7611. A connector is provided between the two T-slots 7612. The connector passes through the through slot 767 of the corresponding wedge block 766.

[0037] Furthermore, the connector includes two coaxially arranged round rods 768, with a spring 7610 fixedly connected between the opposite ends of the two round rods 768. A T-shaped block 769 is fixedly installed at the opposite ends of the two round rods 768, and the T-shaped block 769 is slidably installed inside the corresponding T-shaped groove 7612. A wedge-shaped block 7613 is fixedly installed at the middle of the opposite sides of the two moving blocks 7611, and the inclined surface of the wedge-shaped block 7613 fits against the inclined surface of the wedge-shaped block 766.

[0038] It should be noted that the spring constant of the return spring is greater than that of spring 7610, so that when the return spring is in its natural state, the two side plates are in the closest position and the distance between the two sides of the recessed cavity in the middle of the target connecting aluminum busbar is less than that between the two sides of the cavity. Meanwhile, the two round rods 768 on the connector are in the farthest position and the distance between them is greater than that between the two connecting aluminum busbars. In addition, in order to avoid rigid damage to the connecting aluminum busbar during the calibration process, the connecting buffer plate can also be fixed by connecting springs on the opposite sides of the two side plates 765 and the opposite sides of the two moving blocks 7611. In this configuration, the inclined surfaces of the two movable blocks 7611 are initially in contact with the inclined surfaces at both ends of the U-shaped seat 762. During welding, when the movable blocks 7611 are in contact with the corresponding sides of the target battery pack, the lowest point of the welding mechanism 85 does not contact the target connecting aluminum busbar. Instead, when the welding section 7 is lowered as a whole by the cylinder 72, the correction mechanism 76 lowers synchronously with the horizontal plate 74. Since the inclined ends of the two movable blocks 7611 contact the ends of the U-shaped seat 762 first, under the action of the pressing force, the two movable blocks... The moving block 7611 retracts inward synchronously, and through the inclined surface transmission of the second wedge block 7613 and the first wedge block 766, it drives the cross blocks 764 on both sides to slide synchronously away from the center along the cross groove 763. Finally, the inner surfaces of the two moving blocks 7611 clamp the electrode core and the connecting aluminum strip to achieve automatic centering correction, ensuring that the square annular trajectory of the welding mechanism 75 is concentric with the pole post. The fourth spring 7610 and the return spring together provide buffering and return force, which can be adapted to pole posts within a certain size range to avoid rigidly clamping and damaging the workpiece surface.

[0039] The working principle of the above-mentioned automatic welding device is as follows: First, the pad 4 is placed on the top of the support 2, and the two L-shaped side blocks of the side frame 3 are used for limiting. Then, the two sets of battery modules with aluminum bars to be welded are placed on the top of the pad 4 respectively. The two welding processing stations formed by the two ends of the L-shaped connecting plate and the corresponding L-shaped side blocks are used to support the battery modules to be welded. Then, the corresponding battery pack welding fixture is used to complete the positioning of the two sets of battery modules. Next, the aluminum bars to be welded are placed in the designated positions on the battery modules in sequence, and the slide 71 is controlled to move laterally along the crossbeam 6, driving the welding part 7 to move to the top of the first station. Then, the cylinder 72 is controlled to extend, driving the cross plate 74 and the lower mechanism to descend as a whole. During the overall descent of the horizontal plate 74 and the mechanism below, the correction mechanism 76 first contacts the workpiece, automatically completing the centering and positioning of the connecting aluminum busbar and the electrode core column. After the correction is in place, the two welding mechanisms 75 will simultaneously press against the top of the connecting aluminum busbar. Then, the control drive component 7513 drives the dial plate 7512 to rotate. The rotating dial plate 7512 is used to move the bearing seat 759 smoothly along the square annular channel, and drive the laser welding head at the bottom of the mounting column 7510 to emit light synchronously, completing the synchronous welding of the two square annular welds. After the welding of the first station is completed, the cylinder 72 drives the welding part to rise. At the same time, the steering mechanism 73 is started, driving the horizontal plate 74 to rotate and adjust the orientation of the double welding area to match the electrode column arrangement of the second station. Then, the control slide 71 is moved to the top of the second station, and the descent, correction, and welding process is repeated. In addition, during the welding of the second station, the operator can unload the finished product of the first station and change the workpiece to be welded. The two stations work alternately to achieve continuous production.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An automatic welding device for battery connection aluminum busbars, characterized in that, include: The frame includes a base (1) and gantry frames (5) fixed at both ends of the top of the base (1). A crossbeam (6) is installed between the two gantry frames (5). A support (2) and a side frame (3) located outside the support (2) are fixed on the top of the base (1). A pad (4) is attached to the top of the support (2). The side frame (3) is used to divide the pad (4) installed on the support (2) into two welding processing stations. The welding part (7) includes a slide (71) slidably mounted on the crossbeam (6). A cylinder (72) is fixedly mounted on one side of the slide (71). A steering mechanism (73) is fixedly connected to the telescopic end of the cylinder (72). A horizontal plate (74) is fixedly connected to the lower end of the steering mechanism (73). Welding mechanisms (75) are fixedly mounted at both ends of the bottom of the horizontal plate (74). A correction mechanism (76) is fixedly located at the bottom center of the horizontal plate (74) between the two welding mechanisms (75). The two welding mechanisms (75) are used to form a double-point welding area. The steering mechanism (73) is used to adjust the welding direction of the double-point welding area at the two welding processing stations.

2. The automatic welding device for battery connection aluminum busbars according to claim 1, characterized in that, The side frame (3) consists of two L-shaped side blocks fixed to the top of the base (1) and an L-shaped connecting plate that connects the two L-shaped side blocks. The two L-shaped side blocks are placed at one of the adjacent right-angled sides of the support (2).

3. The automatic welding device for battery connection aluminum busbars according to claim 1, characterized in that, The steering mechanism (73) includes a fixed plate (731). A connecting post (732) is fixedly connected to the telescopic end of the cylinder (72) on the top of the fixed plate (731). Four fasteners are evenly distributed in a ring on the circumferential side of the fixed plate (731). A cover frame (733) for limiting the four fasteners is movably sleeved on the outside of the connecting post (732). There are two connecting posts (732) to prevent the cover frame (733) from swaying. A spring (7314) is fixedly connected between the inner side of the cover frame (733) and the fixed plate (731).

4. The automatic welding device for battery connection aluminum busbars according to claim 3, characterized in that, The steering mechanism (73) also includes a moving plate (7310) and a connecting column (7313) that is fixedly connected to the moving plate (7310) and the cross plate (74). The moving plate (7310) has an annular groove (7311) on its circumferential side and a recessed cavity on its top. A gear ring (7312) is fixedly provided on the side of the recessed cavity. A rotating shaft (738) is mounted on the top of the fixed plate (731) through a bearing in a through-rotation manner. One end of the rotating shaft (738) extending into the recessed cavity is fixedly connected to a gear (739) that meshes with the gear ring (7312).

5. The automatic welding device for battery connection aluminum busbars according to claim 4, characterized in that, The fastener includes a slide (734) opened on the circumferential side of the fixed plate (731), an L-shaped slide (735) is slidably installed inside the slide (734), a spring (736) is fixedly connected between the horizontal section of the L-shaped slide (735) and the inner wall of the slide (734), and a protrusion (737) is fixedly provided at the bottom of the inner side of the vertical section of the L-shaped slide (735) and slidably connected inside the annular groove (7311).

6. The automatic welding device for battery connection aluminum busbars according to claim 1, characterized in that, The welding mechanism (75) includes a rectangular frame (751) and a square column (752) arranged concentrically. Vertical rods (753) are fixedly connected between the four corners of the top of the rectangular frame (751) and the horizontal plate (74). Vertical rods (754) are fixedly connected between the center of the top of the square column (752) and the horizontal plate (74). A cross plate (755) is fixedly sleeved in the middle between the vertical rod (754) and the four vertical rods (753). The cross plate (755) is used to maintain the stability of the square annular channel formed between the rectangular frame (751) and the square column (752).

7. The automatic welding device for battery connection aluminum busbars according to claim 6, characterized in that, The welding mechanism (75) also includes a swing seat (756) that is rotatably sleeved on the outside of the second vertical rod (754) via a bearing. A seat block (758) is movably inserted into one end of the swing seat (756). A spring three (757) is fixedly connected between the seat block (758) and the swing seat (756). A bearing seat (759) is rotatably mounted on the seat block (758) via a rotary joint. An installation column (7510) extending into the inside of the square annular channel is fixedly provided at the bottom end of the bearing seat (759). Multiple cylindrical rollers that are evenly distributed in a ring are rolled and embedded on the circumferential side of the installation column (7510). A guide corner block (7511) is fixedly sleeved on the bottom end of the outside of the four first vertical rods (753) to guide the bearing seat (759) to smoothly transition at the corner of the square annular channel.

8. The automatic welding device for battery connection aluminum busbars according to claim 7, characterized in that, The outer side of the second vertical rod (754) is also connected to a lever plate (7512) via a bearing. The top of the square column (752) is fixedly installed with a drive assembly (7513) for driving the lever plate (7512) to rotate around the second vertical rod (754). The lever plate (7512) is used to move the bearing seat (759) along the square annular groove.

9. The automatic welding device for battery connection aluminum busbars according to claim 1, characterized in that, The correction mechanism (76) includes a U-shaped seat (762), a connecting column three (761) is fixed between the top of the U-shaped seat (762) and the horizontal plate (74), and the inner sides of both ends of the U-shaped seat (762) are inclined. A cross groove (763) is opened on both sides of the middle of the inner cavity of the U-shaped seat (762). A cross block (764) is slidably connected inside the two cross grooves (763). A reset spring is fixed between the opposite ends of the two cross blocks (764) and the inner wall of the corresponding cross groove (763). A side plate (765) is fixedly connected to the opposite ends of the two cross blocks (764). A wedge block one (766) is fixedly provided on the opposite side of the two side plates (765). A through groove (767) is opened through the two wedge blocks one (766).

10. The automatic welding device for battery connecting aluminum busbars according to claim 9, characterized in that, The correction mechanism (76) also includes movable blocks (7611) located at both ends of the U-shaped seat (762). The ends of the two movable blocks (7611) on opposite sides near the U-shaped seat (762) are inclined, and T-shaped grooves (7612) are opened at both ends of the opposite sides of the two movable blocks (7611). A connecting member is provided between the two T-shaped grooves (7612) that are correspondingly arranged and passes through the corresponding through groove (767). Wedge-shaped block two (7613) is fixedly provided in the middle of the opposite sides of the two movable blocks (7611). The connector includes two round rods (768) and a spring four (7610) fixed between the opposite ends of the two round rods (768). Each of the two round rods (768) has a T-block (769) fixedly and slidably connected to the inside of the corresponding T-slot (7612) at one of its opposite ends.

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