A laser welding device for anti-deformation processing of a battery box

Abstract

The application discloses a kind of laser welding devices for battery box anti-deformation processing, it is related to battery box processing equipment technical field, including rack, welding platform, positioning clamping mechanism, laser welding mechanism, liftable reverse deformation support mechanism, with welding pressure cold setting mechanism and detection feedback control mechanism, liftable reverse deformation support mechanism is set on welding platform;With welding pressure cold setting mechanism is connected with laser welding mechanism and can be along the synchronous movement of the weld to be welded, it includes the front pressure assembly in laser welding point front and the rear cooling pressure assembly in laser welding point rear.The welding, front pressure assembly pre-presses the weld both sides plate, laser welding mechanism is subsequently welded, rear cooling pressure assembly is pressed and cooled to welding area, and the reverse deformation support mechanism is synchronously supported weld area below.The application can reduce the frame on the battery box welding process, bottom plate bulge and post-weld springback deformation, improve the box flatness and welding processing consistency.

Description

Technical Field

[0001] This invention relates to the field of battery box processing equipment technology, and in particular to a laser welding device for anti-deformation processing of battery boxes. Background Technology

[0002] The battery enclosure is a crucial load-bearing component in the power battery pack of new energy vehicles, typically used to install, support, and protect battery cell modules, electrical connectors, thermal management components, and related accessories. These enclosures are mostly constructed from aluminum alloy sheets, profiles, or die-cast aluminum parts, characterized by their light weight, large structural dimensions, high sealing requirements, and high assembly precision requirements. During the manufacturing process of the battery enclosure, the base plate, frame, crossbeams, and reinforcing components are usually fixed together by welding. Laser welding is widely used for connections between the battery enclosure frame and base plate, crossbeams and base plate, and reinforcing structures and the main body of the enclosure due to its advantages of concentrated heat input, high welding speed, high automation, and good weld quality.

[0003] Existing laser welding equipment for battery boxes typically includes a frame, welding platform, positioning fixture, clamping mechanism, laser welding head, moving mechanism, and control system. In operation, the battery box components to be welded are first placed on the welding platform. The battery box is positioned and fixed using structures such as positioning blocks, positioning pins, side clamps, upper clamps, or flipping clamps. Then, a gantry moving mechanism, robotic arm, or linear module moves the laser welding head along a preset weld seam trajectory, allowing the laser beam to act on the area to be welded and form a weld seam. The aforementioned frame, welding platform, positioning and clamping mechanism, and laser welding mechanism meet the basic load-bearing, positioning, and welding requirements of the battery box and constitute the fundamental structure of this type of laser welding equipment.

[0004] However, battery boxes are mostly large-sized, thin-walled structural components. The welds between the frame and the base plate, and between the crossbeam and the base plate, are usually quite long. Although the heat input is relatively concentrated during laser welding, the weld area still undergoes rapid heating, melting, and cooling contraction within a short period. Existing devices rely heavily on fixed clamps to constrain the edges or a few points of the box during welding. The area near the weld lacks synchronous clamping during welding, under-deformation support, and control over clamping and cooling of the welded area. This makes the weld area prone to local lifting or misalignment when heated and prone to bulging or warping of the main body of the box when cooling and contracting. Therefore, existing laser welding devices for battery boxes have insufficient constraint and cooling shaping in the weld area, resulting in technical problems such as warping, bulging, or non-flatness deviations in the main body of the battery box after welding. Summary of the Invention

[0005] The purpose of this invention is to provide a laser welding device for anti-deformation processing of battery boxes, so as to solve the technical problems of insufficient constraint and cooling and shaping of the weld area in existing laser welding devices for battery boxes, which leads to warping, bulging or excessive flatness of the battery box after welding.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A laser welding device for anti-deformation processing of battery box bodies includes a frame, a welding platform, a positioning and clamping mechanism, and a laser welding mechanism. The welding platform is mounted on the frame, the positioning and clamping mechanism is used to position and clamp the battery box body, and the laser welding mechanism is used to perform laser welding on the weld seams of the battery box body. The invention further incorporates a liftable anti-deformation support mechanism and a welding-assisted pressure cooling and shaping mechanism on top of the aforementioned basic structure.

[0008] The liftable anti-deformation support mechanism is mounted on the welding platform and located below the weld seam to be welded, providing adjustable support to the corresponding area of ​​the weld seam from the bottom of the battery box body. The welding-in-place cooling and shaping mechanism is connected to the laser welding mechanism and can move synchronously with the laser welding mechanism along the extension direction of the weld seam. The welding-in-place cooling and shaping mechanism includes a front clamping component located in front of the laser welding point in the welding direction and a rear cooling clamping component located behind the laser welding point in the welding direction, so that the area of ​​the weld seam to be welded forms a constrained state of upper clamping and lower support during the welding process.

[0009] Furthermore, the liftable anti-deformation support mechanism includes a support slide rail, a movable support base, a locking component, a lifting drive component, and an arc-shaped heat-conducting support plate. The support slide rail is set on the welding platform and arranged along the extension direction of the weld to be welded. The movable support base is slidably set on the support slide rail. The locking component is used to fix the movable support base in a predetermined position on the support slide rail. The lifting drive component is set on the movable support base. The arc-shaped heat-conducting support plate is connected above the lifting drive component and is used to support the bottom of the battery box body.

[0010] Furthermore, the liftable anti-deformation support mechanism also includes a fine-tuning screw, a pressure sensor, and a ball joint support head. The fine-tuning screw is positioned between the lifting drive component and the arc-shaped heat-conducting support plate, used to adjust the initial support height of the arc-shaped heat-conducting support plate; the pressure sensor is positioned between the fine-tuning screw and the ball joint support head, used to detect the supporting force of the arc-shaped heat-conducting support plate on the battery box body; the ball joint support head is connected below the arc-shaped heat-conducting support plate, used to enable the arc-shaped heat-conducting support plate to adaptively fit at an angle relative to the bottom of the battery box body.

[0011] Furthermore, the welding-and-cooling shaping mechanism includes a follower mounting base, a front clamping assembly, a rear cooling clamping assembly, a clamping drive, and a connecting arm. One end of the connecting arm is connected to the laser welding mechanism, and the other end is connected to the follower mounting base. Both the front clamping assembly and the rear cooling clamping assembly are mounted on the follower mounting base. The clamping drive is used to apply a clamping force towards the battery box body to the front clamping assembly and the rear cooling clamping assembly.

[0012] Furthermore, the front clamping assembly includes a front clamping wheel, a front wheel bracket, a first elastic floating seat, a first guide rod, and a first clamping spring; the rear cooling clamping assembly includes a rear cooling block, a cooling water channel, a water inlet connector, a water outlet connector, a heat-conducting pressure plate, a wear-resistant ceramic slide plate, a second elastic floating seat, a second guide rod, and a second clamping spring. The front clamping assembly is used to clamp the plates on both sides of the weld seam before laser welding, and the rear cooling clamping assembly is used to clamp and conduct heat to cool the weld seam area after welding.

[0013] Furthermore, the device also includes a detection feedback control mechanism, which comprises a laser displacement sensor, an infrared temperature sensor, a pressure detection module, and a controller. The controller adjusts the support height of the liftable anti-deformation support mechanism based on the weld area displacement detected by the laser displacement sensor, adjusts the force applied by the liftable anti-deformation support mechanism and the weld-pressing cooling and shaping mechanism based on the support force or clamping force detected by the pressure detection module, and adjusts the cooling intensity or pressure holding time of the post-weld cooling and pressing assembly based on the post-weld temperature detected by the infrared temperature sensor.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] 1. In this invention, by setting a liftable anti-deformation support mechanism on the welding platform and positioning it below the weld seam of the battery box body, adjustable support can be provided from the bottom of the battery box body to the corresponding area of ​​the weld seam before laser welding, creating a controlled anti-deformation support state in the vicinity of the weld seam. Through the cooperation of the support slide rail, movable support seat, and locking component, the support position can be adjusted along the extension direction of the weld seam to adapt to battery box bodies of different specifications or weld seam positions. Through the cooperation of the lifting drive component, fine-tuning screw, pressure sensor, ball joint support head, and arc-shaped heat-conducting support plate, the initial support height can be adjusted, the support force can be detected, and the arc-shaped heat-conducting support plate can adaptively fit the bottom of the battery box body at an angle, avoiding local pressure damage caused by rigid support. Therefore, during the welding process, the liftable anti-deformation support mechanism can support the thin-walled box body from below the weld seam, counteracting the bulging, warping, and local sagging tendencies caused by welding heat input and cooling contraction, improving the flatness and dimensional stability of the battery box body after welding.

[0016] 2. In this invention, the welding-pressing-cooling-shaping mechanism is connected to the laser welding mechanism, enabling the front pressing assembly, the laser welding mechanism, and the rear cooling pressing assembly to move synchronously along the direction of the weld seam. During welding, the front pressing assembly first presses and adheres the plates on both sides of the weld seam to reduce weld gaps and misalignments; the laser welding mechanism then completes the welding; the rear cooling pressing assembly then presses and conducts heat to cool the weld seam area that has just been welded, ensuring that the weld seam area remains under controlled constraint during the cooling and shrinkage phase. By detecting the displacement of the weld seam area, post-weld temperature, support force, or pressing force through a detection feedback control mechanism, and adjusting the support height, force application state, cooling intensity, or holding time through a controller, the device can adapt to battery box bodies of different thicknesses, specifications, and weld seam lengths, reducing post-weld deformation caused by local heat accumulation during continuous welding of long weld seams, and improving weld seam forming stability, box assembly accuracy, and processing consistency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a front view schematic diagram of the overall structure of the present invention;

[0019] Figure 3 This is a partially enlarged schematic diagram of the liftable anti-deformation support mechanism of the present invention;

[0020] Figure 4 This is a partial schematic diagram of the welding-pressing-cooling-setting mechanism and the laser welding mechanism of the present invention in cooperation.

[0021] Figure 5 This is an exploded view of the structure of the welding-pressing-cooling-setting mechanism of the present invention.

[0022] Legend:

[0023] 1. Frame; 2. Welding platform; 3. Positioning and clamping mechanism; 4. Laser welding mechanism;

[0024] 5. Liftable anti-deformation support mechanism; 51. Support slide rail; 52. Movable support base; 53. Locking component; 54. Lifting drive component; 55. Fine-tuning screw; 56. Pressure sensor; 57. Ball joint support head; 58. Arc-shaped heat-conducting support plate; 581. Heat-conducting plate body; 582. Arc-shaped support surface; 583. Heat insulation pad;

[0025] 6. Welding and pressing cooling shaping mechanism; 61. Follow-up mounting base; 62. Front clamping assembly; 621. Front clamping wheel; 622. Front wheel bracket; 623. First elastic floating seat; 624. First guide rod; 625. First clamping spring; 63. Rear cooling clamping assembly; 631. Rear cooling block; 632. Cooling water channel; 633. Water inlet connector; 634. Water outlet connector; 635. Heat-conducting pressure plate; 636. Wear-resistant ceramic slide; 637. Second elastic floating seat; 638. Second guide rod; 639. Second clamping spring; 64. Clamping drive component; 65. Connecting arm;

[0026] 7. Detection feedback control mechanism; 71. Laser displacement sensor; 72. Infrared temperature sensor; 73. Pressure detection module; 74. Controller; 9. Battery box body. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] It should be noted that the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to direct setup or connection, or indirect setup or connection through centered components or centered structures.

[0029] Furthermore, in embodiments of this invention, terms such as "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, or in a conventional placement or usage state. These terms are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the structures, features, devices, or elements referred to must have a specific orientation or positional relationship, nor that they must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] The various specific technical features and embodiments described in the detailed embodiments can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the various specific technical features / embodiments in this invention will not be described separately.

[0031] like Figures 1 to 5As shown, this embodiment provides a laser welding device for anti-deformation processing of battery boxes, including a frame 1, a welding platform 2, a positioning and clamping mechanism 3, a laser welding mechanism 4, a liftable anti-deformation support mechanism 5, a welding pressure cooling and shaping mechanism 6, and a detection feedback control mechanism 7. The frame 1 is used to support the welding platform 2 and related components. The welding platform 2 is used to place the battery box body 9. The positioning and clamping mechanism 3 is used to position and clamp the battery box body 9. The laser welding mechanism 4 is used to perform laser welding along the weld seam to be welded. The above structure can adopt the conventional structure in existing battery box laser welding equipment. This embodiment does not further limit its internal structure.

[0032] A height-adjustable anti-deformation support mechanism 5 is mounted on the welding platform 2 and located below the weld seam to be welded. The height-adjustable anti-deformation support mechanism 5 includes a support slide rail 51, a movable support base 52, a locking element 53, a lifting drive element 54, a fine-tuning screw 55, a pressure sensor 56, a ball joint support head 57, and an arc-shaped heat-conducting support plate 58. The support slide rail 51 is arranged along the extension direction of the weld seam to be welded. The movable support base 52 is slidably mounted on the support slide rail 51, allowing the arc-shaped heat-conducting support plate 58 to be adjusted to the target support position below the weld seam along with the movable support base 52. The locking element 53 is mounted on the movable support base 52 and is used to lock and fix the movable support base 52 after it has been adjusted into position.

[0033] A lifting drive component 54 is mounted on a movable support base 52, with its output end facing the bottom of the battery box body 9. A fine-tuning screw 55 is positioned between the lifting drive component 54 and the arc-shaped heat-conducting support plate 58, used for fine adjustment of the initial support height of the arc-shaped heat-conducting support plate 58. A pressure sensor 56 is positioned between the fine-tuning screw 55 and the ball joint support head 57, used for detecting the supporting force of the arc-shaped heat-conducting support plate 58 on the bottom of the battery box body 9. The ball joint support head 57 is connected below the arc-shaped heat-conducting support plate 58, enabling the arc-shaped heat-conducting support plate 58 to adaptively conform to the bottom of the battery box body 9 at a small angle.

[0034] It should be noted that the ball joint support head 57 is used to adaptively fit the slight unevenness that may exist at the bottom of the battery box body 9. When the ball joint deflects, the highest point of the arc support surface 582 of the arc heat-conducting support plate 58 will be slightly offset. Since the width of the weld to be welded is usually 2mm to 4mm, this offset is still within the width range of the weld and will not affect the support effect on the area directly below the weld. For battery box bodies with poor bottom flatness, the bottom contour can be scanned in advance by multiple laser displacement sensors 71, and the height of each movable support seat 52 can be independently compensated by the controller 74 to ensure that the arc top is always aligned with the weld position.

[0035] The arc-shaped heat-conducting support plate 58 includes a heat-conducting plate body 581, an arc-shaped support surface 582, and a heat-insulating pad 583. The arc-shaped support surface 582 is disposed on the upper surface of the heat-conducting plate body 581, and the highest area of ​​the arc-shaped support surface 582 is located directly below or adjacent to the weld to be welded. The heat-insulating pad 583 is disposed below the heat-conducting plate body 581 to reduce the transfer of welding heat to the lifting drive component 54. Before welding, the lifting drive component 54 drives the arc-shaped heat-conducting support plate 58 to rise, so that the arc-shaped support surface 582 supports the bottom of the battery box body 9 from below, and forms a slightly anti-deformation support state in the area near the weld to be welded, thereby counteracting the deformation trend caused by the subsequent welding cooling and contraction.

[0036] The welding-in-place cooling and shaping mechanism 6 is connected to the laser welding mechanism 4 and can move synchronously with the laser welding mechanism 4 along the extension direction of the weld seam to be welded. The welding-in-place cooling and shaping mechanism 6 includes a follower mounting base 61, a front clamping assembly 62, a rear cooling clamping assembly 63, a clamping drive component 64, and a connecting arm 65. One end of the connecting arm 65 is connected to the laser welding mechanism 4, and the other end is connected to the follower mounting base 61. The front clamping assembly 62 and the rear cooling clamping assembly 63 are both mounted on the follower mounting base 61; the front clamping assembly 62 is located in front of the laser welding point in the welding direction, and the rear cooling clamping assembly 63 is located behind the laser welding point in the welding direction.

[0037] The front clamping assembly 62 includes a front clamping wheel 621, a front wheel bracket 622, a first elastic floating seat 623, a first guide rod 624, and a first clamping spring 625. The first elastic floating seat 623 is mounted on the follower mounting base 61. The first guide rod 624 is vertically and flexibly mounted on the first elastic floating seat 623. The front wheel bracket 622 is connected to the lower end of the first guide rod 624. The front clamping wheel 621 is rotatably mounted on the front wheel bracket 622. The first clamping spring 625 is sleeved on the outside of the first guide rod 624 and abuts against the first elastic floating seat 623 and the front wheel bracket 622. Two front clamping wheels 621 are provided, located on opposite sides of the weld seam to be welded. These wheels are used to clamp the battery box body 9 plates on both sides of the weld seam before laser welding, reducing the weld gap and making the height of both sides of the weld seam more uniform.

[0038] The post-cooling clamping assembly 63 includes a post-cooling clamping block 631, a cooling water channel 632, a water inlet connector 633, a water outlet connector 634, a heat-conducting pressure plate 635, a wear-resistant ceramic sliding plate 636, a second elastic floating seat 637, a second guide rod 638, and a second clamping spring 639. The second elastic floating seat 637 is mounted on the follower mounting base 61. The second guide rod 638 is vertically and flexibly mounted on the second elastic floating seat 637. The post-cooling clamping block 631 is connected to the lower end of the second guide rod 638. The second clamping spring 639 is sleeved on the outside of the second guide rod 638 and abuts against the second elastic floating seat 637 and the post-cooling clamping block 631, so that the post-cooling clamping block 631 can be elastically pressed against the weld seam area of ​​the battery box body 9.

[0039] A cooling water channel 632 is located inside the rear cooling block 631. An inlet connector 633 and an outlet connector 634 are connected to the cooling water channel 632, respectively, for introducing and discharging cooling medium into and out of the rear cooling block 631. A heat-conducting pressure plate 635 is located below the rear cooling block 631, for conducting heat from the weld area after welding to the rear cooling block 631. A wear-resistant ceramic sliding plate 636 is located at the bottom of the heat-conducting pressure plate 635 and is used for sliding contact with the weld area of ​​the battery box body 9 after welding, thereby reducing moving friction and lowering the risk of welding spatter adhesion. A clamping drive 64 applies a clamping force towards the battery box body 9 to the front clamping assembly 62 and the rear cooling clamping assembly 63, ensuring that the front clamping wheel 621 and the rear cooling block 631 act stably on the weld area during welding movement.

[0040] The detection feedback control mechanism 7 includes a laser displacement sensor, an infrared temperature sensor, a pressure detection module, and a controller. The laser displacement sensor is mounted on the laser welding mechanism 4 or the welding-in-cold-setting mechanism 6, facing the surface of the battery box body 9 near the weld seam, and is used to detect the displacement in the weld seam area. The infrared temperature sensor is mounted behind the post-cooling and pressing assembly 63, facing the weld seam area after welding, and is used to detect the post-weld temperature. The pressure detection module is connected to the liftable anti-deformation support mechanism 5 and the welding-in-cold-setting mechanism 6, and is used to detect the support force or pressing force. The controller is electrically connected to the laser displacement sensor, infrared temperature sensor, pressure detection module, liftable anti-deformation support mechanism 5, and welding-in-cold-setting mechanism 6, respectively.

[0041] The controller employs a closed-loop PID control algorithm, and the specific control logic is as follows:

[0042] Support height adjustment logic: The laser displacement sensor detects the displacement Δh (unit: mm) of the weld area relative to the reference plane in real time. When Δh > +0.3mm (indicating that the weld area bulges upward), the controller sends an upward command to the lifting drive 54, with an upward step size of 0.05mm, and checks every 0.5 seconds until Δh ≤ +0.1mm; when Δh < -0.2mm (indicating that the weld area sinks), the controller sends a downward command, with a downward step size of 0.05mm, until Δh ≥ -0.1mm. The support height adjustment range is controlled within 0~2.0mm.

[0043] Clamping force / support force adjustment logic: The pressure detection module 73 detects the clamping force F1 of the front clamping component 62, the clamping force F2 of the rear cooling clamping component 63, and the support force F3 of the liftable anti-deformation support mechanism 5 in real time. The preset target clamping force is 50N~100N, and the preset target support force is 30N~80N. When the detected F1 or F2 exceeds the target range, the controller adjusts the output air pressure of the clamping drive component 64 or the stroke of the electric cylinder to bring the actual clamping force back to the target range. When F3 exceeds the target range, the controller adjusts the height of the lifting drive component 54 to change the support force. The sampling frequency of each force is 100Hz, and the control cycle is 0.1 seconds.

[0044] Cooling intensity and pressure holding time adjustment logic: The infrared temperature sensor detects the temperature T (unit: °C) of the weld area after welding. When T > 180 °C, the controller increases the cooling water flow rate in the cooling water channel 632, increasing the flow rate from the default 2L / min to 5L / min, and at the same time extends the pressure holding time from the default 1 second to 2 seconds. When T < 120 °C, the default cooling flow rate and pressure holding time are restored. When 120 °C ≤ T ≤ 180 °C, the current parameters are kept unchanged, and the cooling water temperature is controlled between 10 °C and 20 °C.

[0045] The aforementioned control parameters (displacement threshold, clamping force range, temperature threshold, etc.) can be preset and adjusted online through the controller's human-machine interface according to the material, thickness, and welding process requirements of the battery box body 9.

[0046] The controller can adjust the support height of the liftable anti-deformation support mechanism 5 according to the displacement of the weld area detected by the laser displacement sensor; it can adjust the force applied by the liftable anti-deformation support mechanism 5 and the welding-pressing-cooling-shaping mechanism 6 according to the support force or clamping force detected by the pressure detection module; and it can adjust the cooling intensity or holding time of the post-weld cooling and pressing assembly 63 according to the post-weld temperature detected by the infrared temperature sensor. Therefore, the device can dynamically adjust the support, pressing, and cooling conditions according to the actual thermal deformation and cooling conditions during the welding process.

[0047] The working process of this embodiment is as follows: First, the battery box body 9 is placed on the welding platform 2, and the battery box body 9 is positioned and clamped by the positioning clamping mechanism 3; second, the position of the movable support seat 52 on the support slide rail 51 is adjusted according to the position of the weld to be welded, and locked by the locking member 53. The lifting drive member 54 drives the arc-shaped heat-conducting support plate 58 to rise, so that the arc-shaped support surface 582 is attached to and supports the bottom of the battery box body 9 from below. The height of the arc-shaped heat-conducting support plate 58 is adjusted by the fine adjustment screw 55, so that the area near the weld to be welded forms a slightly anti-deformation support state.

[0048] Then, the laser welding mechanism 4 moves along the weld seam to be welded, moving synchronously with the welding pressure cooling and shaping mechanism 6. During the welding process, the front clamping roller 621 first rolls the plates on both sides of the weld seam to be welded, making the plates fit together; the laser welding mechanism 4 then performs laser welding on the weld seam; the rear cooling pressure block 631 then presses the weld seam area that has just been welded, and removes the heat near the weld seam through the cooling water channel 632. At the same time, the arc-shaped heat-conducting support plate 58 supports the battery box body 9 below the weld seam, so that the weld seam area is in a controlled state of being pressed from above and supported from below.

[0049] During the welding process, the detection feedback control mechanism 7 continuously detects the displacement of the weld area, the post-weld temperature, and the support force or clamping force. The controller adjusts the support height of the liftable anti-deformation support mechanism 5, the force state of the welding pressure cooling and shaping mechanism 6, and the cooling intensity or holding time of the post-cooling clamping assembly 63 according to the detection results, thereby reducing the bulging, warping, or flatness deviation of the battery box body 9 caused by long weld welding and cooling shrinkage.

[0050] In other embodiments, the front clamping wheel 621 can be replaced by a front clamping slider, and the rear cooling block 631 can be an air-cooled block, a semiconductor-cooled block, or a block with internal cooling oil channels; the lifting drive 54 can be a cylinder, an electric cylinder, a cam lifting mechanism, or a wedge lifting mechanism; the arc-shaped heat-conducting support plate 58 can be configured as a straight line, an arc, or a segmented combination type according to the shape of the weld to be welded. The above equivalent substitutions do not affect the basic technical concept of the present invention of reducing the welding deformation of the battery box body 9 by cooperating with the lifting anti-deformation support mechanism 5 and the welding pressure cooling and shaping mechanism 6.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser welding device for anti-deformation processing of a battery box, comprising a frame (1), a welding platform (2), a positioning and clamping mechanism (3), and a laser welding mechanism (4), wherein the welding platform (2) is mounted on the frame (1), the positioning and clamping mechanism (3) is used to position and clamp the battery box body (9), and the laser welding mechanism (4) is used to perform laser welding on the weld seam to be welded on the battery box body (9), characterized in that: It also includes a liftable anti-deformation support mechanism (5) and a welding pressure cooling shaping mechanism (6); the liftable anti-deformation support mechanism (5) is set on the welding platform (2) and located below the weld to be welded, and is used to provide adjustable support for the area corresponding to the weld to be welded from the bottom of the battery box body (9); the welding pressure cooling shaping mechanism (6) is connected to the laser welding mechanism (4) and can move synchronously with the laser welding mechanism (4) along the extension direction of the weld to be welded; the welding pressure cooling shaping mechanism (6) includes a front clamping component (62) located in front of the laser welding point welding direction and a rear cooling clamping component (63) located behind the laser welding point welding direction, so that the area of ​​the weld to be welded forms a constrained state of upper clamping and lower support during the welding process.

2. The laser welding device for anti-deformation processing of battery box body according to claim 1, characterized in that: The liftable anti-deformation support mechanism (5) includes a support slide rail (51), a movable support base (52), a locking member (53), a lifting drive member (54), and an arc-shaped heat-conducting support plate (58). The support slide rail (51) is set on the welding platform (2) and arranged along the extension direction of the weld to be welded. The movable support base (52) is slidably set on the support slide rail (51). The locking member (53) is used to fix the movable support base (52) at a predetermined position on the support slide rail (51). The lifting drive member (54) is set on the movable support base (52). The arc-shaped heat-conducting support plate (58) is connected above the lifting drive member (54) and is used to support the bottom of the battery box body (9).

3. The laser welding device for deformation-resistant processing of a battery case according to claim 2, characterized by: The liftable anti-deformation support mechanism (5) further includes a fine-tuning screw (55), a pressure sensor (56), and a ball joint support head (57); the fine-tuning screw (55) is located between the lifting drive component (54) and the arc-shaped heat-conducting support plate (58) to adjust the initial support height of the arc-shaped heat-conducting support plate (58); the pressure sensor (56) is located between the fine-tuning screw (55) and the ball joint support head (57) to detect the support force of the arc-shaped heat-conducting support plate (58) on the battery box body (9); the ball joint support head (57) is connected below the arc-shaped heat-conducting support plate (58) to make the arc-shaped heat-conducting support plate (58) adaptively fit relative to the bottom of the battery box body (9).

4. The laser welding device for deformation-resistant processing of a battery case according to claim 2, characterized by: The arc-shaped heat-conducting support plate (58) includes a heat-conducting plate body (581), an arc-shaped support surface (582), and a heat-insulating pad (583). The arc-shaped support surface (582) is disposed on the upper surface of the heat-conducting plate body (581), and the highest area of ​​the arc-shaped support surface (582) is located directly below or adjacent to the weld to be welded. The heat-insulating pad (583) is disposed below the heat-conducting plate body (581) to reduce the transfer of welding heat to the lifting drive component (54).

5. The laser welding device for deformation-resistant processing of a battery case according to claim 1, characterized by: The welding-cooling shaping mechanism (6) includes a follower mounting base (61), a front clamping assembly (62), a rear cooling clamping assembly (63), a clamping drive (64), and a connecting arm (65). One end of the connecting arm (65) is connected to the laser welding mechanism (4), and the other end is connected to the follower mounting base (61). The front clamping assembly (62) and the rear cooling clamping assembly (63) are both mounted on the follower mounting base (61). The clamping drive (64) is used to apply a clamping force toward the battery box body (9) to the front clamping assembly (62) and the rear cooling clamping assembly (63).

6. The laser welding device for deformation-resistant processing of a battery case according to claim 5, characterized by: The front clamping assembly (62) includes a front clamping wheel (621), a front wheel bracket (622), a first elastic floating seat (623), a first guide rod (624), and a first clamping spring (625). The first elastic floating seat (623) is mounted on a follower mounting base (61), and the first guide rod (624) is vertically and vertically mounted on the first elastic floating seat (623). The front wheel bracket (622) is connected to the lower end of the first guide rod (624), and the front clamping wheel (621) is rotatably mounted on the front wheel bracket (622). There are two front clamping wheels (621), and the two front clamping wheels (621) are located on both sides of the weld to be welded. The first clamping spring (625) is sleeved on the outside of the first guide rod (624) and abuts against the first elastic floating seat (623) and the front wheel bracket (622).

7. The laser welding device for battery case deformation resistance processing according to claim 5, characterized in that: The post-cooling pressing assembly (63) includes a post-cooling pressing block (631), a cooling water channel (632), a water inlet connector (633), a water outlet connector (634), a heat-conducting pressing plate (635), and a wear-resistant ceramic sliding plate (636). The cooling water channel (632) is located inside the post-cooling pressing block (631), and the water inlet connector (633) and the water outlet connector (634) are respectively connected to the cooling water channel (632). The heat-conducting pressing plate (635) is located below the post-cooling pressing block (631), and the wear-resistant ceramic sliding plate (636) is located at the bottom of the heat-conducting pressing plate (635) and is used to slide in contact with the weld seam area of ​​the battery box body (9) after welding.

8. The laser welding device for deformation-resistant processing of a battery case according to claim 7, characterized by: The post-cooling pressing assembly (63) further includes a second elastic floating seat (637), a second guide rod (638), and a second pressing spring (639); the second elastic floating seat (637) is disposed on the follower mounting seat (61), the second guide rod (638) is vertically and flexibly inserted through the second elastic floating seat (637), the post-cooling pressing block (631) is connected to the lower end of the second guide rod (638), and the second pressing spring (639) is sleeved on the outside of the second guide rod (638) and abuts between the second elastic floating seat (637) and the post-cooling pressing block (631).

9. The laser welding device for deformation resistant processing of a battery case according to claim 1, characterized by: It also includes a detection feedback control mechanism (7), which includes a laser displacement sensor, an infrared temperature sensor, a pressure detection module and a controller; the laser displacement sensor is set on the laser welding mechanism (4) or the welding pressure cooling and shaping mechanism (6) and is set towards the surface of the battery box body (9) near the weld seam; the infrared temperature sensor is set behind the post-cooling pressing assembly (63) and is set towards the weld seam area after welding; the pressure detection module is connected to the liftable anti-deformation support mechanism (5) and the welding pressure cooling and shaping mechanism (6); the controller is electrically connected to the laser displacement sensor, the infrared temperature sensor, the pressure detection module, the liftable anti-deformation support mechanism (5) and the welding pressure cooling and shaping mechanism (6) respectively.

10. The laser welding device for deformation-resistant processing of a battery case according to claim 9, characterized by: The controller is used to adjust the support height of the liftable anti-deformation support mechanism (5) according to the displacement of the weld area detected by the laser displacement sensor, adjust the force state of the liftable anti-deformation support mechanism (5) and the welding pressure cooling and shaping mechanism (6) according to the support force or clamping force detected by the pressure detection module, and adjust the cooling intensity or pressure holding time of the cooling and clamping assembly (63) according to the post-weld temperature detected by the infrared temperature sensor.

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