Auxiliary supporting device for preventing welding deformation of battery tray of new energy automobile

Abstract

The invention discloses a new energy automobile battery tray welding anti-deformation auxiliary supporting device, and relates to the technical field of new energy automobile battery trays, the new energy automobile battery tray welding anti-deformation auxiliary supporting device comprises a reference frame, L-shaped clamping seats, self-adaptive limiting mechanisms, elastic pressing mechanisms and supporting legs, the four L-shaped clamping seats are fixedly connected to the four corners of the top end of the frame, and the two self-adaptive limiting mechanisms are in front-back symmetry; the two elastic pressing mechanisms are in bilateral symmetry, the self-adaptive limiting mechanism comprises three telescopic columns, column bodies are fixedly connected with guide limiting plates, belleville spring sets are arranged between the plates and the frame, buffer rubber cakes are installed on the outer sides of the plates, and the two ends of the plates are connected with reinforced L-shaped brackets through magnetic assemblies. The supporting legs are inserted into four corners of the frame to be locked and fixed; according to the device, all-directional constraint is achieved through cooperation of multiple mechanisms, welding thermal stress is offset in a self-adaptive mode, deformation and scratch are prevented, and the welding precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy automobile battery tray, in particular to an auxiliary supporting device for preventing deformation of new energy automobile battery tray welding. BACKGROUND

[0002] As the core direction of global automobile industry transformation and upgrading, the safety performance of new energy vehicles is closely related to the manufacturing precision of core components. As the key bearing structure of the power battery system, the battery tray not only needs to have sufficient mechanical strength to support the weight of the battery module, but also needs to ensure high dimensional accuracy to meet the stringent requirements of battery assembly, sealing and waterproofing, and vehicle chassis adaptation. The welding process is the core process in the manufacturing process of the battery tray. Since the battery tray is made of light alloy materials such as aluminum alloy, such materials have high thermal conductivity and large linear expansion coefficient. During the welding process, the local high-temperature heating and rapid cooling of the heat cycle can easily cause deformation problems such as warping, sagging, and lateral movement. If the deformation exceeds the allowable tolerance, it will directly lead to difficulties in assembling the battery module, failure of the sealing performance, and even cause safety hazards such as uneven heat dissipation of the battery. Therefore, the deformation control during the welding process is a key link in the quality control of the battery tray manufacturing.

[0003] To reduce the impact of welding deformation on the manufacturing precision of the battery tray, various welding auxiliary supporting fixtures have appeared in the prior art. Such fixtures usually use rigid clamping or single-point positioning to fix the battery tray, such as pressing the tray tightly on the reference platform with bolts, or setting fixed blocks at key points of the tray to limit the movement. However, the existing auxiliary supporting devices have obvious shortcomings: the constraint dimension is single, usually only the up-down direction or a single direction is limited, it is difficult to form a full-range collaborative constraint on the battery tray, especially in the front-rear, left-right, and bottom directions; at the same time, there is a lack of self-adaptive compensation mechanism, which cannot adjust the clamping force and supporting position in real time according to the thermal deformation during the welding process. When the tray produces a small deformation due to thermal stress, the rigid constraint structure not only cannot offset the stress, but also may exacerbate the deformation due to the constraint reaction force, making it difficult to control the dimensional accuracy of the tray after welding, and a large amount of manpower and material resources need to be invested for correction, significantly increasing the production cost and production cycle. SUMMARY

[0004] The purpose of the present application is to provide an auxiliary supporting device for preventing deformation of new energy automobile battery tray welding, to solve the problem that the existing battery tray welding deformation prevention fixture is difficult to form a "front-rear-left-right-bottom" full-range closed-loop constraint, and the thermal stress offsetting capability is limited, which easily leads to deformation such as warping, sagging, and lateral movement of the tray and may cause local scratches on the tray.

[0005] In order to achieve the above object, the present application provides the following technical scheme: the auxiliary support device for preventing deformation of new energy vehicle battery tray welding, comprising a battery tray welding reference frame, an L-shaped positioning seat, an adaptive limiting mechanism, an elastic compression mechanism and a supporting leg; The L-shaped positioning seat is fixedly connected to the top end of the battery tray welding reference frame, the L-shaped positioning seat is provided with four and corresponds to the four corner positions of the battery tray respectively, the adaptive limiting mechanism is fixedly arranged on the front and rear sides of the battery tray welding reference frame, the adaptive limiting mechanism is provided with two and is symmetrically arranged, the elastic compression mechanism is fixedly arranged on the left and right sides of the battery tray welding reference frame, and the elastic compression mechanism is provided with two and is symmetrically arranged.

[0006] Preferably, the adaptive limiting mechanism comprises a reinforced L-shaped bracket, a guide limiting plate, a telescopic compensation column, a disc spring group, a contact type buffer rubber cake, a force applying pull rod, a magnetic fixing base, a magnetic rotating arm, a permanent magnet and a connecting block; the telescopic compensation column is slidingly connected to the side wall of the battery tray welding reference frame, the telescopic compensation column is provided with three and is linearly and uniformly distributed along the side wall of the battery tray welding reference frame, the guide limiting plate is fixedly connected to the side wall of the telescopic compensation column, the disc spring group is fixedly connected between the side wall of the guide limiting plate and the side wall of the battery tray welding reference frame, the disc spring group is movably sleeved on the outer wall of the telescopic compensation column, the contact type buffer rubber cake is fixedly connected to the side wall of the guide limiting plate away from the telescopic compensation column, and the force applying pull rod is fixedly connected to the outer wall of the telescopic compensation column.

[0007] Preferably, the magnetic fixing base is fixedly connected to the two ends of the length direction of the guide limiting plate, the connecting block is movably sleeved on the outer wall of the magnetic fixing base, the permanent magnet is fixedly connected to the side wall of the guide limiting plate, the permanent magnet is provided with two and is symmetrically arranged, the magnetic rotating arm is fixedly sleeved on the top end of the magnetic fixing base, the bottom of the magnetic rotating arm is in contact with the top of the permanent magnet, and the reinforced L-shaped bracket is fixedly connected to the side wall of the connecting block.

[0008] Preferably, the elastic compression mechanism comprises a servo drive motor, a transmission screw, a motion guide rod, a U-shaped linear movement platform and a triangular stable positioning jaw; the servo drive motor is fixedly connected to the bottom of the battery tray welding reference frame, the transmission screw is fixedly connected to the output end of the servo drive motor, the transmission screw is rotatably connected to the bottom end of the battery tray welding reference frame through a bearing, and the motion guide rod is fixedly connected to the bottom end of the battery tray welding reference frame and is arranged in parallel with the transmission screw.

[0009] Preferably, one end of the U-shaped linear moving platform is sleeved with a threaded sleeve outside the transmission screw, the other end of the U-shaped linear moving platform is sleeved with a sliding sleeve outside the movement guide rod, the U-shaped linear moving platform is provided with two and is symmetrically arranged, the triangular stable positioning claw is fixedly connected to the U-shaped linear moving platform, and the triangular stable positioning claw is provided with a plurality of and is linearly and uniformly distributed along the length direction of the U-shaped linear moving platform.

[0010] Preferably, the battery tray welding reference frame is provided with mounting grooves at four corners, the support leg top end is in a plug-in fit structure with the mounting grooves, and the support leg and the battery tray welding reference frame side wall are provided with quick locking bolts.

[0011] Preferably, the L-shaped positioning clamping seat top end is threadedly connected with a fastening bolt.

[0012] Preferably, the fastening bolt top end is rotatably connected with a rotating twist handle provided with an anti-skid pattern on the outer wall.

[0013] Preferably, the fastening bolt bottom is rotatably connected with a scratch-proof pressing plate, and the scratch-proof pressing plate bottom is fixedly connected with a high-elastic damping pad block made of temperature-resistant rubber material.

[0014] Compared with the prior art, the present application has the following advantages: The L-shaped positioning clamping seat realizes overall reference fixing, the self-adaptive limiting mechanism provides "front and rear clamping + bottom lifting" constraint, the elastic pressing mechanism realizes "left and right accurate pressing", and the rigid support of the battery tray welding reference frame and the support leg forms "three-dimensional closed loop constraint", can fully offset the welding thermal stress, greatly reduces the tray deformation rate, and improves the size accuracy after welding.

[0015] The disc spring group of the self-adaptive limiting mechanism can absorb the thermal expansion amount through elastic deformation, the contact type buffer rubber cake avoids rigid scratching, the servo drive motor of the elastic pressing mechanism can realize slight reverse rotation through torque feedback, both over-deformation is inhibited through rigid structure and the tray is protected through flexible compensation, and the deformation control and protection demand are balanced.

[0016] The support leg can be disassembled and assembled through the quick locking bolt, is suitable for different operation heights, the self-adaptive limiting mechanism can adjust the clamping force by replacing the disc spring group, the elastic pressing mechanism accurately controls the position of the triangular stable positioning claw through the servo drive motor, is suitable for trays with different thicknesses and materials, the rotating twist handle of the L-shaped positioning clamping seat and the force applying pull rod of the self-adaptive limiting mechanism simplify the operation, shorten the clamping and type changing time, and improve the operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic view of the present application. Figure 2Structure diagram of elastic pressing mechanism of the application; Figure 3 Structure diagram of self-adaptive limiting mechanism of the application; Figure 4 Further structure diagram of self-adaptive limiting mechanism of the application; Figure 5 Structure diagram of L-shaped positioning seat of the application.

[0018] In the figure: 1, battery tray welding reference frame; 2, L-shaped positioning seat; 3, self-adaptive limiting mechanism; 4, elastic pressing mechanism; 5, support leg; 6, mounting groove; 7, quick locking bolt; 8, fastening bolt; 9, scratch-proof pressing plate; 10, high-elastic shock-absorbing pad; 11, rotating twist handle; 31, guide limiting plate; 32, telescopic compensation column; 33, disc spring group; 34, contact type buffer rubber cake; 35, force applying pull rod; 36, magnetic fixed base; 37, magnetic conductive rotating arm; 38, permanent magnet; 39, connecting block; 30, reinforced L-shaped bracket; 41, servo drive motor; 42, transmission screw; 43, movement guide rod; 44, U-shaped linear movement platform; 45, triangular stable positioning clamping jaw. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application.

[0020] Please refer to Figures 1-5As shown, the present application provides a technical solution: a new energy vehicle battery tray welding anti-deformation auxiliary support device, comprising a battery tray welding reference frame, an L-shaped positioning seat, an adaptive limiting mechanism, an elastic compression mechanism, a support leg 5; the L-shaped positioning seat is fixedly connected to the top end of the battery tray welding reference frame, the L-shaped positioning seat is provided with four, the adaptive limiting mechanism is arranged on the front and rear sides of the battery tray welding reference frame, the adaptive limiting mechanism is provided with two and is symmetrically arranged, the elastic compression mechanism is arranged on the left and right sides of the battery tray welding reference frame, and the elastic compression mechanism is provided with two and is symmetrically arranged; four L-shaped positioning seats are respectively fixedly connected to the four corner positions of the top end of the battery tray welding reference frame, forming the connecting base point of the device and the external work position; then the two symmetrically arranged adaptive limiting mechanisms are installed on the front and rear walls of the battery tray welding reference frame, ensuring that the center line of the assembly is aligned with the front and rear direction center line of the battery tray welding reference frame; then the two symmetrically arranged elastic compression mechanisms are installed on the left and right walls of the battery tray welding reference frame, ensuring that they are vertically distributed with the adaptive limiting mechanism in the horizontal plane; finally, the support leg 5 is assembled to the bottom of the battery tray welding reference frame, and the overall structure of the device is built.

[0021] In use, the battery tray welding reference frame serves as the core bearing frame, the support leg 5 provides stable support, the adaptive limiting mechanism and the elastic compression mechanism respectively form preliminary constraints on the battery tray from the front and rear and left and right directions, and the L-shaped positioning seat is used for fixing the subsequent device and the workbench; precise anti-deformation is achieved through multi-dimensional structure cooperation, three telescopic compensation columns 32 in the adaptive limiting mechanism cooperate with the disc spring set 33 to provide adaptive clamping force, the contact type buffer rubber cake 34 avoids damage to the tray surface, the reinforced L-shaped bracket 30 is adsorbed and locked by the magnetic rotating arm 37 and the permanent magnet 38, and the bottom support is quickly formed, the servo drive motor 41 in the elastic compression mechanism drives the transmission screw 42 to drive the U-shaped linear moving platform 44 and the triangular stable positioning clamping jaw 45 to accurately position the left and right sides, combined with the overall rigid support of the battery tray welding reference frame and the support leg 5, the front and rear clamping-bottom lifting-left and right positioning omnibearing constraint is formed, the welding thermal stress is effectively offset, the deformation problems such as tray warping, sagging and lateral movement caused by single-point fixing and incomplete constraint of traditional tooling are solved, the tray welding size precision is greatly improved, and the subsequent correction cost is reduced.

[0022] According to Figure 1 , Figure 3 and Figure 4As shown, the adaptive limiting mechanism comprises a reinforced L-shaped bracket 30, a guide limiting plate 31, a telescopic compensation column 32, a disc spring set 33, a contact type buffer rubber cake 34, a force applying pull rod 35, a magnetic fixing base 36, a magnetic rotating arm 37, a permanent magnet 38, and a connecting block 39. The telescopic compensation column 32 is slidingly connected to the side wall of the battery tray welding reference frame. The telescopic compensation column 32 is provided with three. The guide limiting plate 31 is fixedly connected to the side wall of the telescopic compensation column 32. The disc spring set 33 is fixedly connected between the side wall of the guide limiting plate 31 and the side wall of the battery tray welding reference frame. The disc spring set 33 is movably sleeved on the outer wall of the telescopic compensation column 32. The contact type buffer rubber cake 34 is fixedly connected to the side wall of the guide limiting plate 31 away from the telescopic compensation column 32. The force applying pull rod 35 is fixedly connected to the outer wall of the telescopic compensation column 32.

[0023] Three sliding holes are respectively formed in the front and rear side walls of the battery tray welding reference frame. The three telescopic compensation columns 32 are slidingly connected in the sliding holes one by one, ensuring that the telescopic compensation column 32 can move smoothly in the horizontal direction. The guide limiting plate 31 is fixedly connected to the side wall of the three telescopic compensation columns 32 close to the tray. The three telescopic compensation columns 32 synchronously drive the guide limiting plate 31 to move. The disc spring set 33 is fixedly connected between the guide limiting plate 31 and the side wall of the battery tray welding reference frame. The disc spring set 33 is movably sleeved on the outer wall of the telescopic compensation column 32, preventing the disc spring set 33 from deviating when compressed or reset. The contact type buffer rubber cake 34 is fixedly connected to the side wall of the guide limiting plate 31 away from the telescopic compensation column 32. The force applying pull rod 35 is fixedly connected to the outer wall of the telescopic compensation column 32 away from the guide limiting plate 31.

[0024] In use, the force applying pull rod 35 is pulled. The telescopic compensation column 32 drives the guide limiting plate 31 to compress the disc spring set 33. After the tray is put in, the force applying pull rod 35 is released. The disc spring set 33 resets and pushes the guide limiting plate 31. The contact type buffer rubber cake 34 is attached to the front and rear sides of the tray to achieve clamping.

[0025] According to Figure 3 and Figure 4 , the magnetic fixing base 36 is fixedly connected to the two ends of the guide limiting plate 31. The connecting block 39 is movably sleeved on the outer wall of the magnetic fixing base 36. The permanent magnet 38 is fixedly connected to the side wall of the guide limiting plate 31. The permanent magnet 38 is provided with two and is symmetrically arranged. The magnetic rotating arm 37 is fixedly sleeved on the top end of the magnetic fixing base 36. The bottom of the magnetic rotating arm 37 is in contact with the top of the permanent magnet 38. The reinforced L-shaped bracket 30 is fixedly connected to the side wall of the connecting block 39.

[0026] The operator pulls the force pulling rod 35 of the adaptive limiting mechanism on the front and back sides of the battery tray welding reference frame, the two force pulling rods 35 move away from each other, drive the telescopic compensation column 32 to slide along the side wall of the battery tray welding reference frame (the telescopic compensation column 32 is provided with three to ensure balanced stress), and the telescopic compensation column 32 drives the guide limiting plate 31 to move towards the side wall of the battery tray welding reference frame. At this time, the disc spring set 33 between the guide limiting plate 31 and the side wall of the battery tray welding reference frame is compressed (the disc spring set 33 is movably sleeved on the outer wall of the telescopic compensation column 32 to avoid deviation); place the battery tray into the battery tray welding reference frame, loosen the force pulling rod 35, and the disc spring set 33 is elastically reset to push the guide limiting plate 31 to move towards the tray. The contact type buffer rubber cake 34 away from one side of the telescopic compensation column 32 is tightly attached to the front and back sides of the tray, realizing the preliminary clamping of the tray in the front and back directions.

[0027] According to Figure 2 and Figure 4 , the elastic pressing mechanism includes a servo drive motor 41, a transmission screw 42, a motion guide rod 43, a U-shaped linear movement platform 44, and a triangular stable positioning claw 45. The servo drive motor 41 is fixedly connected to the bottom of the battery tray welding reference frame, the transmission screw 42 is fixedly connected to the output end of the servo drive motor 41, the transmission screw 42 is rotatably connected to the bottom end of the battery tray welding reference frame, and the motion guide rod 43 is fixedly connected to the bottom end of the battery tray welding reference frame. One end of the U-shaped linear movement platform 44 is threadedly sleeved on the outer wall of the transmission screw 42, the other end of the U-shaped linear movement platform 44 is slidably sleeved on the outer wall of the motion guide rod 43, the U-shaped linear movement platform 44 is provided with two and is symmetrically arranged, the triangular stable positioning claw 45 is fixedly connected to the U-shaped linear movement platform 44, and the U-shaped linear movement platform 44 is provided with a plurality of linearly distributed.

[0028] A servo drive motor 41 is fixedly connected to the bottom of the battery tray welding reference frame, one end of a transmission screw 42 is fixedly connected to the output end of the servo drive motor 41, the other end is rotatably connected to the corresponding support at the bottom end of the battery tray welding reference frame through a bearing, and the transmission screw 42 can stably rotate under the drive of the servo drive motor 41. A motion guide rod 43 is fixedly connected to the bottom end of the battery tray welding reference frame and one side of the transmission screw 42, and the motion guide rod 43 is parallel to the transmission screw 42.

[0029] When in use, the servo drive motor 41 is started, the servo drive motor 41 drives the transmission screw rod 42 to rotate clockwise or counterclockwise, and the movement guide rod 43 is used to limit the rotation direction of the U-shaped linear moving platform 44, thereby providing stable guidance for the U-shaped linear moving platform 44 and ensuring that the U-shaped linear moving platform 44 moves linearly along the transmission screw rod 42, thereby laying a power and guidance foundation for the positioning of the tray in the left-right direction; one end of each of the two U-shaped linear moving platforms 44 is threadedly sleeved on the outer wall of the transmission screw rod 42 (the thread directions of the two ends of the transmission screw rod 42 are opposite), and the other end is slidably sleeved on the outer wall of the movement guide rod 43, thereby ensuring that the two U-shaped linear moving platforms 44 can move in opposite directions synchronously when the transmission screw rod 42 rotates; a plurality of linearly distributed triangular stable positioning clamping jaws 45 are fixedly connected to the top end of each U-shaped linear moving platform 44, and the inclined surface of the triangular stable positioning clamping jaw 45 faces the side of the tray.

[0030] When the servo drive motor 41 drives the transmission screw rod 42 to rotate, under the constraint of the movement guide rod 43, the two U-shaped linear moving platforms 44 move close to each other, the inclined surface of the triangular stable positioning clamping jaw 45 first contacts the left and right sides of the tray, the slight deviation of the tray is corrected through the inclined surface guidance, and then the vertical surface of the triangular stable positioning clamping jaw 45 is in close abutment with the side wall of the tray, thereby achieving accurate fixing of the tray in the left-right direction.

[0031] According to the drawings shown in Figure 1 , Figure 2 and Figure 3 , an installation groove 6 is formed at each corner of the battery tray welding reference frame, the top end of the supporting leg 5 is matched with the installation groove 6, and the supporting leg 5 and the side wall of the battery tray welding reference frame are provided with a quick locking bolt 7; four L-shaped positioning clamping seats are provided, and the top end of each L-shaped positioning clamping seat is threadedly connected with a fastening bolt 8.

[0032] An installation groove 6 is formed at each corner of the battery tray welding reference frame, and the shape and size of the installation groove 6 are matched with the top end of the supporting leg 5; the top end of the supporting leg 5 is embedded in the installation groove 6 one by one, so as to preliminarily position the supporting leg 5 and the battery tray welding reference frame; then, a threaded hole is formed at the corresponding position of the side wall of the battery tray welding reference frame, the quick locking bolt 7 is penetrated through the threaded hole and tightened, and the supporting leg 5 and the battery tray welding reference frame are fixedly connected. According to the height requirement of the welding workbench, different lengths of supporting legs 5 can be replaced. When replacing, only the quick locking bolt 7 needs to be loosened, the old supporting leg 5 is removed, the new supporting leg 5 is embedded in the installation groove 6, and the quick locking bolt 7 is tightened again.

[0033] A threaded hole is formed at the top end of each of the four L-shaped positioning clamps, and the fastening bolts 8 are threadedly connected to the threaded holes one by one, so as to ensure that the fastening bolts 8 can move up and down along the threaded holes. When it is needed to fix the device on the welding workbench, the four L-shaped positioning clamps are respectively attached to the edges or preset installation positions of the workbench, and then the fastening bolts 8 are rotated to move downward along the threaded holes until the bottoms of the fastening bolts 8 are in close contact with the surface of the workbench. Through the friction force between the fastening bolts 8 and the workbench and the self-locking action of the threads, the device is fixed on the workbench. When it is needed to move the device, the fastening bolts 8 are reversely rotated to be separated from the surface of the workbench.

[0034] According to Figure 1 , Figure 4 and Figure 5 , the bottom of the fastening bolt 8 is rotatably connected with a scratch-preventing pressing plate 9, the bottom of the scratch-preventing pressing plate 9 is fixedly connected with a high-elastic shock-absorbing pad 10, and the top end of the fastening bolt 8 is rotatably connected with a rotating handle 11.

[0035] The scratch-preventing pressing plate 9 is rotatably connected to the bottom of the fastening bolt 8 through a bearing, so as to ensure that the scratch-preventing pressing plate 9 only moves up and down without rotating with the fastening bolt 8 when the fastening bolt 8 rotates. The high-elastic shock-absorbing pad 10 is fixedly connected to the bottom of the scratch-preventing pressing plate 9, and the lower surface of the high-elastic shock-absorbing pad 10 is kept flat. The rotating handle 11 is fixedly connected to the top end of the fastening bolt 8, and the outer wall of the rotating handle 11 is provided with anti-slip lines.

[0036] When the rotating handle 11 is rotated, the rotating handle 11 drives the fastening bolt 8 to move downward along the threaded holes of the L-shaped positioning clamps, the fastening bolt 8 pushes the scratch-preventing pressing plate 9 to synchronously descend, and the high-elastic shock-absorbing pad 10 at the bottom of the scratch-preventing pressing plate 9 gradually adheres to the surface of the workbench. The rotating handle 11 is continuously rotated until the high-elastic shock-absorbing pad 10 is moderately compressed, so as to stably fix the device on the workbench.

[0037] The whole mechanism achieves the following effects: The device is fixed with the welding workbench through four L-shaped positioning clamping seats 2. The right-angle fitting characteristics of the L-shaped structure are used to fit the clamping seat accurately on the edge of the workbench or the preset installation position, so as to ensure that the overall center of the device is aligned with the work center. The operator rotates the anti-slip rotating handle 11 at the top of the fastening bolt 8, drives the fastening bolt 8 to move vertically downward along the clamping seat through threaded transmission, and the scratch-proof pressing plate 9 at the bottom of the bolt is lowered synchronously. Since the pressing plate and the bolt are rotationally connected, the bolt can avoid scratching the surface of the workbench when it rotates. When the temperature-resistant rubber high-elastic shock-absorbing pad 10 at the bottom of the pressing plate is in close contact with and moderately compressed on the surface of the workbench, on the one hand, the friction force of the rubber pad enhances the fixing stability, and on the other hand, the elastic buffering characteristics are used to absorb the vibration impact in the welding process. At the same time, the threaded self-locking structure ensures that the device will not be displaced during the whole welding process. According to the welding work height requirement, the support leg 5 with the corresponding length is selected, the top end of the support leg 5 is inserted into the installation slot 6 at the four corners of the battery tray welding reference frame 1, the initial positioning is realized through the plug-in cooperation of the installation slot 6, then the quick locking bolt 7 between the support leg 5 and the side wall of the frame is tightened, so that the support leg 5 and the frame are rigidly connected, the four support legs 5 are distributed in a quadrilateral, and the stable vertical support is provided for the reference frame through the principle of three-point determination plane, so as to avoid the inclination of the frame due to its own weight or the tray load, and ensure the horizontal reference surface of the subsequent positioning mechanism; adjust the self-adaptive limiting mechanism 3: pull the force applying rod 35 to make the telescopic compensation cylinder 32 slide along the side wall of the frame, drive the guide limiting plate 31 to compress the disc spring set 33, at this time, the contact type buffer rubber cake 34 keeps the minimum distance with the side wall of the frame, and the magnetically conductive rotating arm 37 is rotated to be separated from the permanent magnet 38, so as to rotate the reinforced L-shaped bracket 30 to the horizontal expanded state, so as to reserve enough space for the tray, and adjust the elastic pressing mechanism 4: start the servo drive motor 41 to drive the transmission screw 42 to reverse, since the thread directions of the transmission screw 42 at both ends are opposite, the two symmetrical U-shaped linear moving platforms 44 are synchronously separated to both sides along the movement guide rod 43, so that the triangular stable positioning clamping jaw 45 keeps the maximum distance with the inner side of the frame, and the initial state preparation is completed. The positioning and clamping stage forms a closed-loop constraint on the battery tray from the front, back, left, right and bottom dimensions through the step-by-step actions of the self-adaptive limiting mechanism and the elastic pressing mechanism, ensures that the tray is in a precise positioning state before welding, and the operator places the battery tray to be welded into the reference frame, so that the four corners of the tray are preliminarily attached to the inner side of the right angle of the L-shaped positioning seat 2, completing the rough positioning. Then, the force pulling rod 35 of the self-adaptive limiting mechanism 3 is loosened, the disc spring set 33 releases the elastic potential energy, and the guide limiting plate 31 is pushed to move towards the tray until the contact type buffer rubber cake 34 on the side wall of the guide limiting plate 31 is tightly attached to the front and back side walls of the tray. The buffer rubber cake is made of temperature-resistant elastic material, which can not only avoid scratches on the surface of the tray caused by rigid contact, but also increase the contact area through elastic deformation to improve the clamping stability. At this time, the three linearly distributed telescopic compensation columns 32 are synchronously stressed, the elastic force of the disc spring set 33 is uniformly transmitted to the front and back side walls of the tray through the guide limiting plate 31, forming an adaptive clamping force (the clamping force can be adjusted by replacing disc spring sets 33 with different stiffness), and after the side wall clamping is completed, the guide magnetic rotating arm 37 of the reinforced L-shaped bracket 30 is rotated to make its bottom adsorbed and locked with the permanent magnet 38 on the guide limiting plate 31. At this time, the horizontal section of the bracket just holds the edge position of the bottom of the tray, and through the combination structure of "front and back clamping + bottom lifting", the translation in the front and back direction and the vertical collapse deformation of the tray are effectively limited. The servo drive motor 41 of the elastic pressing mechanism 4 is started, the motor output end drives the transmission screw 42 to rotate in the positive direction, and since the movement guide rod 43 restricts the rotational freedom of the U-shaped linear moving platform 44, the two platforms move synchronously towards the center along the screw axis. The triangular stable positioning clamping jaw 45 on the top of the platform first contacts the left and right side walls of the tray with a slope, and uses the guiding effect of the slope to correct the position of the tray slightly, ensuring that the center of the tray is aligned with the center of the frame. As the platform continues to move, the vertical surface of the clamping jaw tightly abuts against the side wall of the tray, forming a rigid pressing force. The triangular stable positioning clamping jaw 45 linearly distributed along the length of the platform can uniformly transmit the pressing force to multiple points on the left and right side walls of the tray, avoiding local stress concentration caused by single-point pressing. The closed-loop control characteristic of the servo drive motor 41 can accurately control the moving distance of the platform, thereby realizing quantitative adjustment of the pressing force and adapting to battery trays of different thicknesses and materials. At this time, the device forms a three-dimensional closed-loop constraint of "front and back adaptive clamping - bottom lifting support - left and right accurate pressing", and the tray is completely fixed and the positioning accuracy meets the welding requirements.In the welding anti-deformation stage, the local high temperature generated during the welding process will cause the tray material to expand and contract due to heat, and the dual mechanism of "rigid constraint + elastic compensation" will offset the thermal stress to ensure the dimensional accuracy of the tray. The battery tray welding reference frame 1 is made of high-strength alloy material, which has excellent rigidity and anti-deformation ability. As the reference carrier of the entire constraint system, it can effectively resist the thermal stress transmitted by the tray during the welding process and avoid the positioning reference deviation caused by the deformation of the frame itself. At the same time, the rigid connection of the support leg 5 with the frame and the L-shaped positioning seat 2 with the workbench forms a rigid force transmission path from the workbench to the frame and then to the tray, limiting the welding deformation of the tray to the minimum range. When the welding area of the tray expands due to heating, the expansion force in the front-rear direction will act on the guide limiting plate 31, pushing the telescopic compensation cylinder 32 to slide outward. At this time, the disc spring group 33 is compressed again, absorbing the thermal expansion of the tray through the elastic deformation of the spring, avoiding the tray warping or lateral movement caused by the expansion force. Since the disc spring group 33 has nonlinear stiffness characteristics, it provides a larger restoring force when the deformation is small, ensuring that the tray is always in a constrained state. When the tray cools and shrinks after welding is completed, the disc spring group 33 resets and pushes the guide limiting plate 31 to follow, maintaining close contact with the tray to prevent deformation caused by gaps during the shrinking process. The contact-type buffer rubber cake 34 can still maintain elasticity in a high-temperature environment and can buffer the impact load during the thermal expansion process. Its temperature resistance prevents damage to the rubber cake during high-temperature welding. The bottom of the reinforced L-shaped bracket 30 can effectively resist the collapse deformation of the tray caused by high-temperature softening, and cooperate with the front-rear clamping force to form a comprehensive constraint in the up-down and front-rear directions of the tray. The left-right elastic compression mechanism 4 uses a servo-driven rigid transmission structure. The tight abutment of the triangular stable positioning claw 45 with the tray sidewall can limit the thermal expansion deformation of the tray in the left-right direction. When the tray expands slightly due to heat, the claw is transmitted to the transmission screw 42 through the U-shaped linear moving platform 44. Due to the rigidity of the screw, it can provide a stable reaction force to inhibit excessive expansion. If the expansion force exceeds the preset threshold, the servo drive motor 41 can achieve a small reverse rotation through torque feedback to avoid local damage to the tray caused by rigid constraint. After the expansion stabilizes, it returns to the compression state, realizing the anti-deformation control of "rigid constraint as the main, flexible fine tuning as the auxiliary". In the end, after the welding operation is completed, the device resets in the order of "unlocking the left-right constraint first, then unlocking the front-rear constraint, and finally taking out the tray", ensuring that the tray is taken out in a stress-free state. First, the left-right constraint is unlocked: the servo drive motor 41 is started in reverse rotation, the transmission screw 42 drives the two U-shaped linear moving platforms 44 to separate to the sides, the triangular stable positioning claw 45 is separated from the left and right sidewalls of the tray, and the left-right direction constraint is released. Second, the front-rear constraint and the bottom lifting are unlocked: pull the force rod 35 of the self-adaptive limiting mechanism 3, make the telescopic compensation cylinder 32 drive the guide limiting plate 31 to compress the disc spring group 33, and the contact-type buffer rubber cake 34 is separated from the front and rear sidewalls of the tray.Meanwhile, the magnetic rotating arm 37 is rotated to separate from the permanent magnet 38, the reinforced L-shaped bracket 30 is rotated to the outside to release the bottom lifting constraint; finally, the tray is taken out and the device is reset: the operator takes out the welded tray from the reference frame, loosens the fastening bolt 8 of the L-shaped positioning clasp seat 2, and directly carries the device if it needs to be moved, and repeats the above preparation and positioning process if it needs to work continuously.

[0038] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An auxiliary support device for preventing deformation during welding of battery trays for new energy vehicles, comprising a battery tray welding reference frame (1), an L-shaped positioning bracket (2), an adaptive limiting mechanism (3), an elastic pressing mechanism (4), and support legs (5); characterized in that: The L-shaped positioning bracket (2) is fixedly connected to the top of the battery tray welding reference frame (1). There are four L-shaped positioning brackets (2) and they correspond to the four corners of the battery tray respectively. The adaptive limiting mechanism (3) is fixedly installed on the front and rear sides of the battery tray welding reference frame (1). There are two adaptive limiting mechanisms (3) and they are symmetrically arranged. The elastic pressing mechanism (4) is fixedly installed on the left and right sides of the battery tray welding reference frame (1). There are two elastic pressing mechanisms (4) and they are symmetrically arranged.

2. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 1, characterized in that: The adaptive limiting mechanism (3) includes a reinforced L-shaped bracket (30), a guide limiting plate (31), a telescopic compensation column (32), a disc spring assembly (33), a contact buffer pad (34), a force-applying pull rod (35), a magnetic fixing base (36), a magnetically conductive rotating arm (37), a permanent magnet (38), and a connecting block (39); the telescopic compensation column (32) is slidably connected to the side wall of the battery tray welding reference frame (1), and there are three telescopic compensation columns (32) along the side wall of the battery tray welding reference frame (1). The linearly and uniformly distributed guide limiting plate (31) is fixedly connected to the side wall of the telescopic compensation column (32), the disc spring assembly (33) is fixedly connected between the side wall of the guide limiting plate (31) and the side wall of the battery tray welding reference frame (1), the disc spring assembly (33) is movably sleeved on the outer wall of the telescopic compensation column (32), the contact buffer rubber plate (34) is fixedly connected to the side wall of the guide limiting plate (31) away from the telescopic compensation column (32), and the force-applying tie rod (35) is fixedly connected to the outer wall of the telescopic compensation column (32).

3. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 2, characterized in that: The magnetic fixing base (36) is fixedly connected to both ends of the guide limiting plate (31) along its length. The connecting block (39) is movably sleeved on the outer wall of the magnetic fixing base (36). The permanent magnet (38) is fixedly connected to the side wall of the guide limiting plate (31). There are two permanent magnets (38) arranged symmetrically. The magnetically guided rotating arm (37) is fixedly sleeved on the top of the magnetic fixing base (36). The bottom of the magnetically guided rotating arm (37) contacts the top of the permanent magnet (38). The reinforced L-shaped bracket (30) is fixedly connected to the side wall of the connecting block (39).

4. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 1, characterized in that: The elastic clamping mechanism (4) includes a servo drive motor (41), a transmission screw (42), a motion guide rod (43), a U-shaped linear moving platform (44), and a triangular stable positioning claw (45). The servo drive motor (41) is fixedly connected to the bottom of the battery tray welding reference frame (1), the transmission screw (42) is fixedly connected to the output end of the servo drive motor (41), the transmission screw (42) is rotatably connected to the bottom end of the battery tray welding reference frame (1) through a bearing, and the motion guide rod (43) is fixedly connected to the bottom end of the battery tray welding reference frame (1) and is arranged parallel to the transmission screw (42).

5. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 4, characterized in that: One end of the U-shaped linear moving platform (44) is threaded onto the outer wall of the transmission screw (42), and the other end of the U-shaped linear moving platform (44) is slidably sleeved onto the outer wall of the motion guide rod (43). There are two U-shaped linear moving platforms (44) arranged symmetrically. The triangular stable positioning claws (45) are fixedly connected to the U-shaped linear moving platform (44). There are several triangular stable positioning claws (45) and they are linearly and evenly distributed along the length direction of the U-shaped linear moving platform (44).

6. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 1, characterized in that: The battery tray welding reference frame (1) has mounting grooves (6) at its four corners. The top of the support leg (5) and the mounting groove (6) are connected by a plug-in joint. The support leg (5) and the side wall of the battery tray welding reference frame (1) are provided with quick-locking bolts (7).

7. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 1, characterized in that: The top of the L-shaped positioning bracket (2) is threaded with a fastening bolt (8).

8. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 7, characterized in that: The top of the fastening bolt (8) is rotatably connected to a rotating handle (11) with anti-slip texture on the outer wall.

9. The auxiliary support device for preventing deformation during welding of new energy vehicle battery trays according to claim 8, characterized in that: The bottom of the fastening bolt (8) is rotatably connected to an anti-scratch pressure plate (9), and the bottom of the anti-scratch pressure plate (9) is fixedly connected to a high-elasticity shock-absorbing pad (10) made of heat-resistant rubber.

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