New energy vehicle battery box welding tool

Abstract

The invention relates to the technical field of new energy vehicle battery frame assembly welding, in particular to a new energy vehicle battery box welding tool. The workbench is provided with a horizontal datum plane located at the installation height; the supporting platform can ascend and descend through lifting equipment, and the horizontal datum plane of the supporting platform circulates between the installation height for welding and the positioning height higher than the installation height. The cross beam positioning module is used for carrying out coarse positioning and fine positioning on a cross member of the battery frame assembly at the mounting height; the longitudinal beam positioning module is arranged on the supporting platform and is used for carrying out coarse positioning and fine positioning on a longitudinal component of the battery frame assembly at the positioning height; after the longitudinal component of the battery frame assembly completes coarse positioning and fine positioning, the lifting device drives the supporting platform to descend to the installation height. The method has the effects of reducing the labor intensity of workers and reducing stress concentration points on the surface of the frame assembly during welding.

Description

Technical Field

[0001] The present application relates to the technical field of welding of battery frame assemblies of new energy vehicles, and in particular to a welding tool for battery boxes of new energy vehicles. Background Art

[0002] The performance and life of batteries are directly related to the performance, mileage and reliability of electric vehicles. The quality and stability of batteries are also crucial in the new energy vehicle industry. As one of the key supporting components of the battery, the battery frame assembly plays an important role in battery performance and structural stability. The welding process is one of the key links in the manufacture of the battery frame assembly, and its quality is directly related to the performance and safety of the battery.

[0003] In electric vehicles, the advancement of battery technology is considered to be one of the key factors, and battery performance is directly related to the vehicle's range, charging speed and service life. However, the performance of the battery is not only affected by the battery chip itself, but also by the design and manufacturing quality of the battery frame assembly. As a key component of the battery, the battery frame assembly undertakes multiple important tasks. It provides structural support for the battery chip and protects the battery chip from external vibration and impact, thereby ensuring the stability and safety of the battery under different road conditions. In the production process of the power battery frame assembly of new energy vehicles, it is usually necessary to group and weld multiple metal brackets (including crossbeams, longitudinal beams, end plates and other structural parts) on a welding workbench.

[0004] Referring to the Chinese patent application document with publication number CN119016981A and publication date November 26, 2024, entitled "A type of automatic welding equipment for processing new energy electric vehicle components", due to the large weight of the new energy battery frame, the new energy battery frame assembly and the accessories to be welded are lifted by clamps and lifting devices, and the new energy battery frame assembly and welding accessories are lifted to the welding position, and the workers fine-tune the new energy battery frame when lifting it to the welding point.

[0005] However, since the weight of a single aluminum alloy longitudinal beam of the new energy battery frame can reach 80-150kg, even if it is lifted to the welding station by existing equipment and then manually pushed by the operator, it will cause a heavy labor burden on the operator; secondly, the bracket often moves due to inertia after being lifted to the workbench, and repeated fine-tuning is required to reach the preset position, resulting in low assembly efficiency; what is more serious is that the friction between the bracket and the workbench during manual adjustment can easily cause scratches on the aluminum alloy surface. These defects may become stress concentration points during subsequent welding, affecting the overall strength of the frame. Summary of the invention

[0006] In view of this, the present application provides a new energy vehicle battery box welding tool, which aims to solve the problem of high labor intensity for workers and stress concentration points that are easily generated on the surface of the frame assembly during welding.

[0007] In order to solve the above technical problems, the present application provides a welding tool for a battery box of a new energy vehicle.

[0008] A welding tool for a battery box of a new energy vehicle comprises a workbench having a horizontal reference surface at an installation height. The welding tool further comprises: a support platform, which is vertically slidably arranged on the workbench and has a horizontal reference surface formed by fine processing, and can be lifted and lowered by a lifting device, and its horizontal reference surface can cycle between an installation height for welding and a positioning height higher than the installation height; a crossbeam positioning module, which is arranged on the workbench and performs rough positioning and fine positioning on the transverse components of the battery frame assembly at the installation height; and a longitudinal beam positioning module, which is arranged on the support platform and performs rough positioning and fine positioning on the longitudinal components of the battery frame assembly at the positioning height; wherein, after the longitudinal components of the battery frame assembly complete the rough positioning and fine positioning, the lifting device drives the support platform down to the installation height.

[0009] By adopting the above technical solution, the support platform has a finely machined horizontal reference surface, and it circulates between the installation height (welding height) and the positioning height (longitudinal beam positioning height) through the lifting equipment. After the longitudinal beam is positioned at the positioning height, it automatically drops to the installation height to avoid manual pushing of the longitudinal beam weighing 80-150kg, solving the problems of high operating intensity and scratches on the edges and corners. In addition, the longitudinal beam is contacted and positioned with the reference surface of the support platform at the positioning height, and there is no lateral friction during the descent process, which prevents scratches on the surface of the aluminum alloy and avoids the occurrence of stress concentration in the later welding. The longitudinal beam is separated from the crossbeam when positioned at a high position to avoid interference between components. The rough positioning and fine positioning are completed in stages to reduce the number of repeated adjustments. In addition, the spatial separation of the crossbeam positioning module and the longitudinal beam positioning module allows the crossbeam to be directly positioned on the workbench plane while the longitudinal beam is positioned at a high position on the support platform. The spatial separation of the two realizes synchronous operation and shortens the overall assembly time.

[0010] Optionally, the transverse member of the battery frame assembly includes a first crossbeam and a second crossbeam parallel to each other, and the crossbeam positioning module includes an axial positioning subsystem and a radial positioning subsystem for performing coarse positioning and fine positioning of the first crossbeam and the second crossbeam.

[0011] Optionally, the axial positioning subsystem includes: a fixed limit block, which is fixed on the workbench and is arranged on each side of the first beam and the second beam, and an axial installation margin is reserved at the axial standard assembly position of the first beam and the second beam; a side thrust member, which is arranged on the workbench and is used to push the first beam and the second beam to the axial standard assembly position after the first beam and the second beam are tightly positioned with the fixed limit block.

[0012] By adopting the above technical solution, the fixed limit block reserves an axial installation margin. When hoisting the first beam and the second beam, the reserved axial installation margin allows a certain installation error, reducing the dependence on hoisting accuracy, making it easy for operators to complete the rough positioning of the first beam and the second beam. After the first beam and the second beam are pressed against the fixed limit block, the side thrust member pushes the first beam and the second beam to the standard position, completing the precise positioning of the first beam and the second beam.

[0013] Optionally, the radial positioning subsystem includes: two push plates, which are slidably arranged on the workbench and are respectively located on the outside, and radial installation margins are reserved between the initial positions of the two push plates and the radial assembly positions of the beam along the radial direction perpendicular to the axial direction of the beam; two push plates, which are slidably arranged on the workbench and are respectively located on the outside of the first beam and the second beam, and radial installation margins are reserved between the initial positions of the two push plates and the radial assembly positions of the beam along the Y-axis direction; a linear drive, used to push the first beam and the second beam to move to the radial standard assembly position.

[0014] By adopting the above technical solution, a margin is reserved between the initial position of the push plate and the radial assembly position of the first beam and the second beam, so as to facilitate the installation of the first beam and the second beam, and then the linear drive pushes the first beam and the second beam to move to the standard radial assembly position to complete the precise radial positioning of the first beam and the second beam. And by applying pressure in opposite directions by the double push plates, it is possible to avoid local deformation of the beam due to excessive unilateral thrust, and improve the positioning stability of the aluminum alloy thin-walled structure.

[0015] Optionally, the longitudinal components of the battery frame assembly include a first longitudinal beam, a second longitudinal beam and a structural reinforcement beam which are parallel to each other, and the longitudinal beam positioning module is used to perform coarse positioning and fine positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam in the radial direction, and when two push plates move the first cross beam and the second cross beam to the radial standard assembly position, the first cross beam and the second cross beam move the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam to the axial standard assembly position.

[0016] By adopting the above technical solution, the radial positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam is independently completed by the longitudinal beam positioning module, while the axial positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam is passively achieved by the movement of the first crossbeam and the second crossbeam. The radial positioning of the first crossbeam and the second crossbeam is synchronized with the axial positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam. The crossbeam rigid structure is used as the longitudinal beam axial positioning reference, so that the longitudinal beam end and the crossbeam positioning surface are automatically fitted. The safety risk of manually carrying the overweight first longitudinal beam, the second longitudinal beam and the structural reinforcement beam is eliminated, and the problems of low efficiency, poor precision and great safety hazards caused by the discrete process are systematically solved.

[0017] Optionally, the longitudinal beam positioning module includes multiple groups of limiting protrusions fixedly mounted on the supporting platform, each group of limiting protrusions is provided with at least two respectively located on both sides of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam, and the spacing between each group of limiting protrusions should exceed the radial length of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam. The longitudinal beam positioning module also includes an adjustment mechanism for precisely positioning the longitudinal beam during the process of the supporting platform moving from the installation height to the assembly height.

[0018] By adopting the above technical scheme, multiple groups of limiting protrusions are symmetrically arranged on both sides of the longitudinal beam, and the spacing between each group of limiting protrusions exceeds the radial length of the longitudinal beam, thereby reserving a rough positioning margin for the installation of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam, allowing the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam to fall freely within the reserved rough positioning margin, thereby reducing the dependence on lifting accuracy, and solving the problem of repeated adjustments caused by inertial displacement in the background technology. In the process of descending the supporting platform, the adjustment mechanism accurately positions the longitudinal beam, and uses the mechanical movement of the platform descending to trigger the action of the adjustment mechanism, thereby automatically correcting the longitudinal beam from the rough positioning position to the standard position, thereby completely eliminating the safety hazards caused by manually pushing the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam.

[0019] Optionally, the adjustment mechanism includes: a support rod, which is fixed on the workbench and has a first inclined surface at the end; a sliding push block, which is slidably arranged in the limiting protrusion and has a second inclined surface matching the first inclined surface; a guide cavity and a guide block, the guide cavity is arranged inside the limiting protrusion, the guide block is fixedly connected to the sliding push block and can slide along the guide cavity; an elastic reset member, which is arranged between the guide block and the guide cavity.

[0020] Optionally, the lifting device is a lifting mechanism driven by a hydraulic cylinder or a servo motor, which is fixed to the bottom of the workbench and connected to the support platform through a rigid connecting rod, and is used to control the lifting of the support platform between an installation height and a positioning height.

[0021] Optionally, the elastic return member is a coil spring, a butterfly spring or an elastic rubber column.

[0022] Optionally, the side thrust member can push the first crossbeam and the second crossbeam to perform displacement compensation with an accuracy of 1-2 mm by pneumatic or hydraulic driving until the first crossbeam and the second crossbeam move to a standard axial assembly position.

[0023] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects: 1. The support platform has a finely machined horizontal reference surface, and it cyclically moves between the installation height (welding height) and the positioning height (longitudinal beam positioning height) through the lifting equipment. After the longitudinal beam is positioned at the positioning height, it automatically descends to the installation height to avoid manual pushing of the longitudinal beam weighing 80-150kg, solving the problems of high operating intensity and scratches on edges and corners. In addition, the longitudinal beam is positioned in contact with the reference surface of the support platform at the positioning height. There is no lateral friction during the descent process, which prevents scratches on the surface of the aluminum alloy and avoids the occurrence of stress concentration in the later welding. The longitudinal beam is separated from the crossbeam when positioned at a high position to avoid interference between components. Rough positioning and fine positioning are completed in stages to reduce the number of repeated adjustments. In addition, the crossbeam positioning module and the longitudinal beam positioning module are spatially separated. While the crossbeam is directly positioned on the workbench plane, the longitudinal beam is positioned at a high position on the support platform. The spatial separation of the two enables synchronous operation, shortening the overall assembly time; 2. The fixed limit block reserves an axial installation margin. When hoisting the first beam and the second beam, the reserved axial installation margin allows a certain installation error, reducing the dependence on hoisting accuracy, making it easy for operators to complete the rough positioning of the first beam and the second beam. After the first beam and the second beam are pressed against the fixed limit block, the side thrust piece pushes the first beam and the second beam to the standard position, completing the fine positioning of the first beam and the second beam; 3. The radial positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam is independently completed by the longitudinal beam positioning module, while the axial positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam is passively achieved through the movement of the first crossbeam and the second crossbeam. The radial positioning of the first crossbeam and the second crossbeam is synchronized with the axial positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam. The crossbeam rigid structure is used as the longitudinal beam axial positioning reference, so that the longitudinal beam end and the crossbeam positioning surface are automatically fitted. The safety risk of manually carrying the overweight first longitudinal beam, the second longitudinal beam and the structural reinforcement beam is eliminated, and the problems of low efficiency, poor precision and high safety hazards caused by the discrete process are systematically solved; 4. Multiple groups of limit protrusions are symmetrically arranged on both sides of the longitudinal beam, and the spacing between each group of limit protrusions exceeds the radial length of the longitudinal beam, which reserves a rough positioning margin for the installation of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam, allowing the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam to fall freely within the reserved rough positioning margin, reducing the dependence on lifting accuracy, and solving the problem of repeated adjustments caused by inertial displacement in the background technology. During the descent of the supporting platform, the adjustment mechanism accurately positions the longitudinal beam, and uses the mechanical movement of the platform descent to trigger the action of the adjustment mechanism, automatically correcting the longitudinal beam from the rough positioning position to the standard position, completely eliminating the safety hazards caused by manual pushing of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a battery frame assembly of a new energy vehicle according to an embodiment of the present application; Figure 2 A schematic diagram of the structure of a workbench that reflects welding tooling; Figure 3 To show the structural diagram of the frame assembly installed on the workbench; Figure 4 for Figure 3 Top view of the middle frame assembly installed on the workbench; Figure 5 for Figure 3 Side view of the middle frame assembly installed on the workbench; Figure 6 for Figure 4 A partial enlarged view of the middle area A; Figure 7 A cross-sectional view of the adjustment mechanism.

[0025] Description of reference numerals: 1. Support platform; 2. Beam positioning module; 21. Axial positioning subsystem; 211. Fixed stop block; 212. Side push piece; 22. Radial positioning subsystem; 221. Push plate; 222. Linear drive; 3. Longitudinal beam positioning module; 31. Limiting convex block; 32. Adjustment mechanism; 321. Support rod; 322. Sliding push block; 323. Guide cavity; 324. Guide block; 325. Elastic reset member; 33. Lifting device; 100. Welding tooling; 101. Workbench; 200. Frame assembly; 201. First cross beam; 202. Second cross beam; 203. First longitudinal beam; 204. Second longitudinal beam; 205. Structural reinforcement beam. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 7 , the technical solutions of the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them.

[0027] The embodiment of the present application provides a new energy vehicle battery box welding tool for welding a frame assembly 200 of a battery box of a new energy vehicle.

[0028] Figure 1 The structure diagram of the frame assembly 200 of the new energy battery box of the embodiment of the present application is shown. Figure 2 FIG. 2 shows a schematic diagram of the assembly state of the frame assembly 200 installed on the welding tool 100. Figure 1 and Figure 2 As shown, the frame assembly 200 of the battery of the new energy vehicle provided in the embodiment of the present application includes a transverse structure and a longitudinal structure, wherein the transverse structure includes a first crossbeam 201 and a second crossbeam 202, and the longitudinal structure includes a first longitudinal beam 203, a second longitudinal beam 204, and a plurality of structural reinforcement beams 205. The first crossbeam 201, the second crossbeam 202, the first longitudinal beam 203, and the second longitudinal beam 204 are welded to form a rectangular main frame. The structural reinforcement beam 205 and the first crossbeam 201, the second crossbeam 202, the first longitudinal beam 203, and the second longitudinal beam 204 are laser welded to form a mesh-shaped grid structure, thereby dividing the internal space of the frame assembly 200 into a plurality of battery cell module accommodating areas.

[0029] Furthermore, the cross-sections of the first cross beam 201, the second cross beam 202, the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 are all hollow cavity structures and are filled with flame-retardant polyurethane foam material, thereby achieving lightweight while improving energy absorption efficiency under collision conditions.

[0030] Figure 3-Figure 5 The structure of the frame assembly 200 installed on the workbench 101 is shown, wherein Figure 3 For a stereogram, Figure 4 is a top view, Figure 5It is a side view. The welding tooling for the battery box of a new energy vehicle provided in this embodiment includes a workbench 101 formed by fine machining of a horizontal reference surface, and the workbench 101 is integrated with a beam positioning module 2 for composite positioning of coarse positioning and fine positioning of the first crossbeam 201 and the second crossbeam 202, and a longitudinal beam positioning module 3 for composite positioning of coarse positioning and fine positioning of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205. When it is necessary to weld the frame assembly 200 of the new energy battery box, firstly, the first crossbeam 201, the second crossbeam 202, the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 are hoisted to a preset position by a hoisting mechanism. As an embodiment, the hoisting mechanism in the present application is a multi-degree-of-freedom hoisting device, which specifically includes a truss-type mechanical arm whose motion trajectory establishes a linkage mapping relationship with the coordinate system of the workbench 101 and an actuator connected to the end of the truss-type mechanical arm. The actuator also includes an electromagnetic adsorption fixture with a flexible conductive layer on the surface, a visual positioning module that includes a dual-frequency laser interferometer and a CCD image sensor to form a closed-loop posture feedback system, and an anti-sway mechanism that uses a magnetorheological damper to achieve active vibration suppression control of the load.

[0031] The beam positioning module 2 includes an axial positioning subsystem 21 for positioning the first beam 201 and the second beam 202 in the axial direction. The axial positioning subsystem 21 includes a fixed stopper 211 fixed on the workbench 101 and arranged along the length direction of the first beam 201 and the second beam 202, and used to pre-position the first beam 201 and the second beam 202. An axial installation margin is reserved between the first beam 201 and the second beam 202 positioned by the fixed stopper 211 and the standard position, thereby achieving the rough positioning of the first beam 201 and the second beam 202 in the axial direction, while reducing the probability of scratching the surface of the beam due to the self-gravity of the beam when the first beam 201 and the second beam 202 are directly placed in the standard assembly position.

[0032] The axial positioning subsystem 21 also includes a side thrust member 212 slidably connected to the workbench 101. The side thrust member 212 can push the beam to perform displacement compensation with an accuracy of 1-2mm through pneumatic or hydraulic drive until the beam moves to the standard assembly position, thereby completing the precise positioning of the beam in the axial direction.

[0033] The beam positioning module 2 also includes a radial positioning subsystem 22 arranged along the radial direction of the first beam 201 and the second beam 202. The radial positioning subsystem 22 includes two push plates 221 located outside the first beam 201 and the second beam 202, respectively. A radial installation margin is reserved between the initial positions of the two push plates 221 and the radial assembly positions of the first beam 201 and the second beam 202. The radial positioning subsystem 22 also includes a linear actuator 222 for pushing the first beam 201 and the second beam 202 to move to the radial standard assembly position. The linear actuator 222 can synchronously move the two push plates 221 inward by pneumatic or hydraulic driving. When the first crossbeam 201 and the second crossbeam 202 are both placed close to the inner side of the push plate 221, the two push plates 221 are moved inward synchronously by the linear driver 222. While moving, the inner side surfaces of the push plates 221 abut against the side walls of the first crossbeam 201 and the second crossbeam 202 and then push the first crossbeam 201 and the second crossbeam 202 to move toward the center respectively, until the first crossbeam 201 and the second crossbeam 202 are both moved to the assembly position by the push plate 221, thereby completing the precise positioning of the first crossbeam 201 and the second crossbeam 202 in their radial directions.

[0034] The welding tool 100 provided in the present application also includes a support platform 1 slidably arranged on a workbench 101, and the support platform 1 can realize the conversion between two positions at an installation height and a positioning height higher than the installation height driven by a lifting device 33. The linear lifting device 33 can be a device such as a cylinder, an oil cylinder or an electromagnetic push rod, which can realize linear movement of the actuator end. The lifting and positioning accuracy can be formed by a laser rangefinder and an incremental encoder to form a double closed-loop feedback, and the positioning accuracy is guaranteed to be ≤±0.02mm.

[0035] Figure 6 for Figure 4 A partial enlarged view of area A in the middle. Figure 7 The cross-sectional view of the adjustment mechanism 32 is shown. The longitudinal beam positioning module 3 is arranged on the support platform 1, and can realize the rough positioning of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 at the positioning height, and implement the precise positioning of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 during the movement of the support platform 1 from the positioning height to the installation height. The longitudinal beam positioning module 3 includes a plurality of groups of limiting protrusions 31 for realizing the rough positioning of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 at the installation height, and the adjustment mechanism 32 for implementing the precise positioning of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 during the movement of the support platform 1 from the positioning height to the installation height.

[0036] A plurality of groups of limiting protrusions 31 are fixedly arranged on the support platform 1, and the spacing L of each group of limiting protrusions 31 should exceed the radial length of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205. Specifically, the spacing L of the limiting protrusions 31 satisfies: L=1.05D+δ (D is the longitudinal beam diameter, δ is the thermal expansion compensation amount), thereby providing the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 with a displacement tolerance margin during installation. The purpose of this setting is to reduce the probability of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 being damaged by friction and collision with the limiting protrusions 31 due to the small space between the limiting protrusions 31 when the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 can be successfully placed between the two limiting protrusions 31.

[0037] The adjustment mechanism 32 includes a support rod 321 with one end fixed on the workbench 101 and the other end sliding through the support platform 1 and having a first inclined surface arranged toward the side of the limiting protrusion 31; a sliding push block 322 is slidably arranged on the limiting protrusion 31; the sliding push block 322 is provided with a second inclined surface matching the guide inclined surface toward the side of the support rod 321; a guide cavity 323 is arranged inside the limiting protrusion 31; a guide block 324 fixedly connected to the sliding push block 322 is arranged in the guide cavity 323; an elastic reset member 325 is fixedly arranged between the guide block 324 and the side wall of the guide cavity 323, wherein the elastic reset member 325 is a coil spring, a butterfly spring or an elastic rubber column. When the support platform 1 is at the installation height, the sliding push block 322 contracts under the action of the elastic reset member 325. When the support platform 1 descends, the second inclined surface contacts the first inclined surface, and the sliding push block 322 extends along the radial direction of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205, thereby pushing the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 to move in their radial direction to the assembly position.

[0038] The adjustment mechanism 32 realizes the precise conversion of the vertical movement of the support platform 1 to the horizontal displacement of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 through the inclined plane transmission and the elastic reset structure: its core is composed of a support rod 321 (with a first inclined plane at the end) fixed to the workbench 101 and a sliding push block 322 (with a matching second inclined plane) in the limiting protrusion 31. When the support platform 1 descends, the first inclined plane of the support rod 321 contacts the second inclined plane of the sliding push block 322, converting the vertical downward pressure into a thrust in the radial direction of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205, forcing the sliding push block 322 to overcome the resistance of the elastic reset member 325 and extend outward, pushing the crossbeam to the assembly position, and when the platform is reset, the elastic reset member 325 pulls the sliding push block 322 to retract.

[0039] Through the above-mentioned method, the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 can be smoothly placed between the two limiting protrusions 31, thereby reducing the probability that the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 will be damaged due to friction and collision with the limiting protrusions 31 due to the small space between the limiting protrusions 31. The radial positioning subsystem 22 also includes a precise positioning component that is slidably arranged between the limit protrusions 31. When the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 fall together with the support platform 1, the precise positioning component pushes the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 to the assembly position. At the same time, two push plates 221 clamp the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 from both ends, thereby achieving the centering effect of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205.

[0040] The implementation principle of the new energy vehicle battery box welding tooling of the embodiment of the present application is as follows: the first crossbeam 201 and the second crossbeam 202 are roughly positioned axially by the fixed limit block and the movable side push piece 212 on the workbench 101, and are driven to a precise position by the radial push plate 221; the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 are roughly positioned by the limit protrusion 31 at the high position of the support platform 1. When the support platform 1 descends, the first inclined surface of the support rod 321 contacts the second inclined surface of the sliding push block 322, converting the vertical movement into horizontal thrust, pushing the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 to move radially to the standard position, and at the same time, the ends of the first longitudinal beam 203, the second longitudinal beam 204 and the structural reinforcement beam 205 are in rigid contact with the positioned first crossbeam 201 and the second crossbeam 202 to complete axial self-correction.

[0041] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A welding tool for a battery box of a new energy vehicle, comprising a workbench having a horizontal reference surface at an installation height, characterized in that: Welding tools also include: The support platform is vertically slidably arranged on the workbench and has a horizontal reference surface formed by precision machining, which can be raised and lowered by a lifting device, and its horizontal reference surface cycles between an installation height for welding and a positioning height higher than the installation height; A crossbeam positioning module, which is disposed on the workbench and performs rough and fine positioning of the cross members of the battery frame assembly at the installation height; and A longitudinal beam positioning module, which is disposed on the support platform and performs rough positioning and fine positioning of the longitudinal members of the battery frame assembly at the positioning height; Among them, after the longitudinal components of the battery frame assembly complete the rough positioning and fine positioning, the lifting equipment drives the supporting platform down to the installation height.

2. The welding tool according to claim 1, characterized in that: The transverse member of the battery frame assembly includes a first crossbeam and a second crossbeam parallel to each other, and the crossbeam positioning module includes an axial positioning subsystem and a radial positioning subsystem for performing rough positioning and fine positioning on the first crossbeam and the second crossbeam.

3. The welding tool according to claim 2, characterized in that: The axial positioning subsystem comprises: A fixed stopper, which is fixed on the workbench and is provided one on each side of the first beam and the second beam, and an axial installation margin is reserved at the axial standard assembly position of the first beam and the second beam; The side pusher is arranged on the workbench and is used for pushing the first crossbeam and the second crossbeam to move to the standard axial assembly position after the first crossbeam and the second crossbeam are tightly positioned with the fixed limit block.

4. The welding tool according to claim 2, characterized in that: The radial positioning subsystem comprises: Push plates are slidably arranged on the workbench and are provided with two push plates, which are respectively located outside the first crossbeam and the second crossbeam, and radial installation margins are reserved between the initial positions of the two push plates and the assembly positions of the crossbeams in the radial direction perpendicular to the axial direction of the crossbeams; The linear drive is used for pushing the first crossbeam and the second crossbeam to move to a standard assembly position in a radial direction.

5. The welding tool according to claim 4, characterized in that: The longitudinal components of the battery frame assembly include a first longitudinal beam, a second longitudinal beam and a structural reinforcement beam which are parallel to each other. The longitudinal beam positioning module is used to perform coarse positioning and fine positioning of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam in the radial direction, and when two push plates move the first cross beam and the second cross beam to the radial standard assembly position, the first cross beam and the second cross beam move the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam to the axial standard assembly position.

6. The welding tool according to claim 5, characterized in that: The longitudinal beam positioning module includes multiple groups of limiting protrusions fixedly installed on the support platform, each group of limiting protrusions is provided with at least two and are respectively located on both sides of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam, and the spacing between each group of limiting protrusions should exceed the radial length of the first longitudinal beam, the second longitudinal beam and the structural reinforcement beam. The longitudinal beam positioning module also includes an adjustment mechanism for accurately positioning the longitudinal beam during the process of the support platform moving from the installation height to the assembly height.

7. The welding tool according to claim 6, characterized in that: The adjustment mechanism comprises: A support rod, which is fixed on the workbench and has a first inclined surface at the end; A sliding push block is slidably disposed in the limiting protrusion and has a second inclined surface matching the first inclined surface; A guide cavity and a guide block, wherein the guide cavity is arranged inside the limiting protrusion, and the guide block is fixedly connected to the sliding push block and can slide along the guide cavity; The elastic reset member is arranged between the guide block and the guide cavity.

8. The welding tool according to claim 1, characterized in that: The lifting device is a lifting mechanism driven by a hydraulic cylinder or a servo motor, which is fixed to the bottom of the workbench and connected to the support platform through a rigid connecting rod, and is used to control the lifting of the support platform between the installation height and the positioning height.

9. The welding tool according to claim 7, characterized in that: The elastic reset element is a coil spring, a butterfly spring or an elastic rubber column.

10. The welding tool according to claim 3, characterized in that: The side thrust piece can push the first cross beam and the second cross beam to perform displacement compensation with an accuracy of 1-2 mm by pneumatic or hydraulic driving, until the first cross beam and the second cross beam move to the standard assembly position in the axial direction.

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