A friction stir welding tool for a battery pack

Abstract

The utility model discloses a kind of for battery box's friction stir welding tool, including base, positioning mechanism and clamping mechanism, the top of the base is fixed with support plate, the positioning mechanism includes positioning plate and positioning cylinder, the positioning plate is set to support plate top around, the positioning cylinder is fixed to support plate top, the clamping mechanism includes clamping cylinder, the positive of clamping cylinder is provided with pressure arm, and the side of clamping cylinder is equipped with adapter block, the pressure arm is connected with adapter block by pivot, the top of the support plate is provided with suction pad mounting plate, suction pad is installed on the suction pad mounting plate, the side of adapter block is equipped with proximity sensor. The friction stir welding tool for battery box design is advanced, convenient to use, by setting and the proximity sensor of electric control box electric connection, avoid the interference that pressure arm generates to the operation of stirring head, automation control is realized, the degree of complexity of manual operation is reduced, and welding efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of friction stir welding technology, specifically relating to a friction stir welding fixture for battery boxes. Background Technology

[0002] Battery enclosures (especially power battery packs in new energy vehicles) must be completely sealed to prevent the ingress of water, dust, oxygen, etc., and to prevent leakage of electrolyte or other substances in the event of battery thermal runaway. Even a tiny pore or crack is unacceptable. Friction stir welding, on the other hand, is a solid-state bonding process where the metal does not melt, thus fundamentally avoiding common defects in fusion welding such as pores, shrinkage cavities, and cracks that occur during the solidification process of molten metal. It can form a dense, uniform, and defect-free weld with extremely high airtightness, easily meeting IP67 or even higher protection standards.

[0003] Friction stir welding (FSW) technology was invented by the Welding Institute (TWI) in the UK in 1991, and a patent was applied for in the UK the following year. Patent protection was subsequently sought in various countries worldwide. Since its patent protection and publication, FSW technology has been increasingly widely used, primarily in the field of lightweight metal structures such as aluminum alloys and magnesium alloys, and has also seen some development in the field of high-melting-point materials. The FSW method is similar to conventional friction welding. FSW also utilizes frictional heat and plastic deformation heat as the welding heat source. The difference lies in the welding process: a cylindrical or other shaped (such as a threaded cylinder) welding pin is inserted into the joint of the workpiece. The high-speed rotation of the welding head causes friction between the pin and the workpiece material, raising the temperature and softening the material at the joint. The softened area is then pressed together to complete the weld. During the welding process, the welding head applies a huge axial force (downward pressure) and longitudinal force (forward resistance) to the workpiece. If the workpiece is not firmly fixed, problems such as workpiece displacement or warping, weld deformation, poor precision, and even equipment damage may occur. Therefore, the primary task of the tooling is to overcome these enormous forces and torques and to firmly and precisely fix the workpiece in the preset position.

[0004] Existing fixtures typically use bolts to push a clamping plate downwards, which then fixes the position of the plates to be welded. This type of device requires frequent bolt tightening, making operation cumbersome and affecting welding efficiency. Therefore, there is an urgent need to design a friction stir welding fixture for battery boxes to solve these problems. Utility Model Content

[0005] The purpose of this invention is to provide a friction stir welding fixture for battery boxes to solve the problems existing in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a friction stir welding fixture for battery boxes, comprising: A base, the top of which is fixed with a support plate; A positioning mechanism, comprising a positioning plate and a positioning cylinder, wherein the positioning plate is disposed around the top of a support plate, wherein two adjacent positioning plates are fixedly connected to the support plate, and the other two positioning plates are movably connected to the support plate, and the positioning cylinder is fixed to the top of the support plate and is respectively disposed corresponding to the movably disposed positioning plate; The clamping mechanism includes a clamping cylinder arranged around the base, a pressure arm arranged directly above the clamping cylinder, and a transition block fixed to the top of the support plate on one side of the clamping cylinder. The middle part of the pressure arm is connected to the top of the transition block through a rotating shaft. The piston rod of the clamping cylinder is movably connected to one end of the pressure arm, and a clamping block is fixedly connected to the other end of the pressure arm. A suction cup mounting plate is arranged on the top of the support plate, and a suction cup is mounted on the suction cup mounting plate. A proximity sensor is arranged on one side of the transition block.

[0007] Furthermore, at least four guide plates are fixed to the top of the support plate, and the four guide plates are distributed in pairs on both sides of the support plate, with the guide plates on both sides of the support plate being arranged in a one-to-one correspondence.

[0008] Furthermore, a power distribution box and an electrical control box are provided on one side of the base, and a solenoid valve is provided on the other side of the base, with a solenoid valve cover provided on the outside of the solenoid valve.

[0009] Furthermore, lifting rings are fixed at the four top corners of the support plate.

[0010] Furthermore, the suction cup is an electric suction cup, and the solenoid valve, positioning cylinder, clamping cylinder, suction cup, and proximity sensor are all electrically connected to the electrical control box.

[0011] Furthermore, the inner side of the positioning plate is provided with an anti-scratch pad, which is made of rubber.

[0012] Furthermore, a shock-absorbing pad is provided between the suction cup mounting plate and the support plate, and the shock-absorbing pad is made of a polymer damping material.

[0013] The technical effects and advantages of this utility model are as follows: This friction stir welding fixture for battery boxes features an advanced design, compact structure, ease of use, and reliable operation. Through the coordinated action of the positioning mechanism and the clamping mechanism, it can quickly and accurately position and fix the battery box, effectively avoiding problems such as workpiece displacement, warping, weld deformation, and poor precision caused by the huge axial and longitudinal forces applied by the stirring head. This greatly improves the stability and quality of the welding. Simultaneously, by setting a proximity sensor electrically connected to the control box, when the stirring head approaches the sensor, the corresponding clamping cylinder retracts its piston rod, and the pressure arm lifts the clamping block upwards, avoiding interference with the operation of the stirring head. This achieves automated control, reduces the tediousness of manual operation, and improves welding efficiency. Furthermore, the anti-scratch pad made of rubber on the inner side of the positioning plate protects the surface of the battery box from scratches during positioning, and the shock-absorbing pad made of polymer damping material between the suction cup mounting plate and the support plate effectively reduces vibration during welding, further ensuring welding precision and quality. Overall, it possesses strong practicality and market competitiveness. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the present invention; Figure 3 This is the front view of the present invention; Figure 4 This is the left view of the present invention.

[0015] In the diagram: 100, base; 101, support plate; 102, guide plate; 103, distribution box; 104, electrical control box; 105, solenoid valve; 106, solenoid valve cover; 107, lifting ring; 200, positioning mechanism; 201, positioning plate; 202, positioning cylinder; 300, clamping mechanism; 301, clamping cylinder; 302, pressure arm; 303, adapter block; 304, clamping block; 305, suction cup mounting plate; 306, suction cup; 307, proximity sensor. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] This utility model provides, for example Figure 1-4 The friction stir welding fixture for a battery box shown includes: The base 100 has a support plate 101 fixed to its top; The positioning mechanism 200 includes a positioning plate 201 and a positioning cylinder 202. The positioning plate 201 is disposed around the top of the support plate 101. Two adjacent positioning plates 201 are fixedly connected to the support plate 101, and the other two positioning plates 201 are movably connected to the support plate 101. The positioning cylinder 202 is fixed to the top of the support plate 101 and is respectively disposed corresponding to the movably disposed positioning plate 201. The clamping mechanism 300 includes a clamping cylinder 301 arranged around the base 100, a pressure arm 302 arranged directly above the clamping cylinder 301, and a transition block 303 fixed to the top of the support plate 101 on one side of the clamping cylinder 301. The middle part of the pressure arm 302 is connected to the top of the transition block 303 through a rotating shaft. The piston rod of the clamping cylinder 301 is movably connected to one end of the pressure arm 302, and a clamping block 304 is fixedly connected to the other end of the pressure arm 302. A suction cup mounting plate 305 is arranged on the top of the support plate 101, and a suction cup 306 is mounted on the suction cup mounting plate 305. A proximity sensor 307 is arranged on one side of the transition block 303.

[0020] For example, see Figures 1-3As shown, at least four guide plates 102 are fixed on the top of the support plate 101. The four guide plates 102 are distributed in pairs on both sides of the support plate 101, and the guide plates 102 on both sides of the support plate 101 are arranged in a one-to-one correspondence.

[0021] In this technical solution, the guide plate 102 plays a preliminary guiding role when placing the battery box, ensuring that the battery box can be placed more accurately in the preset position of the support plate 101, which facilitates the precise positioning and fixing operation of the subsequent positioning mechanism 200 and clamping mechanism 300, and helps to improve the operating efficiency and positioning accuracy of the entire welding fixture.

[0022] For example, see Figures 1-4 As shown, a distribution box 103 and an electrical control box 104 are provided on one side of the base 100, and a solenoid valve 105 is provided on the other side of the base 100. A solenoid valve cover 106 is provided outside the solenoid valve 105.

[0023] In this technical solution, the power distribution box 103 provides power support for the entire welding fixture, ensuring the normal operation of each component. The electrical control box 104 is equipped with a programmable logic controller (PLC). This controller can accurately control the sequence and timing of the actions of the positioning cylinder 202, clamping cylinder 301, and suction cup 306 based on the signal fed back by the proximity sensor 307, realizing precise positioning and clamping operations before automated welding. Under the control of the electrical control box 104, the solenoid valve 105 can accurately control the actions of pneumatic components such as cylinders, thereby realizing the positioning and clamping operations of the battery box. The solenoid valve cover 106 plays a role in protecting the solenoid valve 105, preventing it from being interfered with and damaged by external factors, extending the service life of the solenoid valve 105, and improving the stability and reliability of the entire welding fixture.

[0024] For example, see Figures 1-3 As shown, lifting rings 107 are fixed at the four corners of the top of the support plate 101.

[0025] In this technical solution, the lifting ring 107 facilitates the handling and installation of the entire welding fixture. When it is necessary to move or adjust the position of the welding fixture, it can be lifted by the lifting ring 107, which is convenient and quick to operate, reduces the labor intensity of manual handling, and also avoids damage to the welding fixture during handling, thereby improving work efficiency and safety.

[0026] For example, see Figures 1-3 As shown, the suction cup 306 is an electric suction cup. The solenoid valve 105, positioning cylinder 202, clamping cylinder 301, suction cup 306 and proximity sensor 307 are all electrically connected to the electrical control box 104.

[0027] In this technical solution, the electric suction cup has advantages such as strong adsorption force and precise control. It can quickly and stably adsorb or release the battery box according to the instructions issued by the electric control box 104, which improves the reliability and stability of clamping. The electrical connection between each component and the electric control box 104 enables the entire welding fixture to achieve automated control. The electric control box 104 can centrally control the action sequence and time of each component, realizing the automated operation of positioning, clamping, welding and other processes, reducing manual intervention and improving welding efficiency and quality.

[0028] For example, the inner side of the positioning plate 201 is provided with a scratch-resistant pad (not shown in the figure), which is made of rubber.

[0029] In this technical solution, during the positioning process, the positioning plate 201 will come into contact with the surface of the battery box. The rubber anti-scratch pad has good flexibility and cushioning performance, which can effectively prevent the positioning plate 201 from scratching the surface of the battery box, protect the appearance quality of the battery box, and reduce problems such as the decline in the sealing performance of the battery box that may be caused by scratches, thereby improving the service life and safety of the battery box.

[0030] For example, a shock-absorbing pad (not shown in the figure) is provided between the suction cup mounting plate 305 and the support plate 101. The shock-absorbing pad is made of a polymer damping material.

[0031] In this technical solution, the high-speed rotation of the stirring head and the welding operation during the welding process will generate a certain amount of vibration. If these vibrations are transmitted to the battery box, they may affect the accuracy and quality of the welding. The shock-absorbing pad made of polymer damping material has good shock absorption performance, which can effectively absorb and attenuate vibration energy, reduce the impact of vibration on the battery box, thereby ensuring the accuracy and quality of the welding and improving the stability of the welding.

[0032] Working Principle: When using this friction stir welding fixture for battery boxes, the battery box is first placed on the support plate 101. Under the initial guidance of the guide plate 102, the battery box can accurately reach the vicinity of the preset position. Then, the control box 104 is activated, which controls the positioning cylinder 202 to move. The positioning cylinder 202 pushes the movable positioning plate 201 towards the battery box, cooperating with the fixed positioning plate 201 to accurately position the battery box from all sides. At this time, the rubber anti-scratch pad on the inner side of the positioning plate 201 contacts the surface of the battery box to avoid scratching it. After positioning is completed, the control box 104 controls the clamping cylinder 301 to extend, pushing the pressure arm 302 to rotate around the pivot, causing the clamping block 304 at the other end of the pressure arm 302 to press down on the battery box. Meanwhile, under the control of the control box 104, the electric suction cup 306 adsorbs the battery box, further enhancing the stability of the clamping. The polymer damping material shock-absorbing pad between the suction cup mounting plate 305 and the support plate 101 begins to play its role, reducing the impact of vibration on the battery box during subsequent welding. When the stirring head approaches the proximity sensor 307, the proximity sensor 307 feeds back a signal to the control box 104. The control box 104 controls the clamping cylinder 301 corresponding to the proximity sensor 307 to retract its piston rod, and the pressure arm 302 drives the clamping block 304 to lift upward, avoiding interference with the operation of the stirring head. After the stirring head completes the welding operation and leaves, the control box 104 controls the relevant components to return to the clamping state. The entire welding process is automated, efficiently and accurately completing the friction stir welding of the battery box.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A friction stir welding fixture for battery boxes, characterized in that, include: A base (100) has a support plate (101) fixed to its top. The positioning mechanism (200) includes a positioning plate (201) and a positioning cylinder (202). The positioning plate (201) is disposed around the top of the support plate (101). Two adjacent positioning plates (201) are fixedly connected to the support plate (101), and the other two positioning plates (201) are movably connected to the support plate (101). The positioning cylinder (202) is fixed to the top of the support plate (101) and is respectively disposed corresponding to the movably disposed positioning plates (201). The clamping mechanism (300) includes a clamping cylinder (301) arranged around the base (100), a pressure arm (302) arranged directly above the clamping cylinder (301), and a transition block (303) fixed to the top of the support plate (101) on one side of the clamping cylinder (301). The middle part of the pressure arm (302) is connected to the top of the transition block (303) through a rotating shaft. The piston rod of the clamping cylinder (301) is movably connected to one end of the pressure arm (302). The other end of the pressure arm (302) is fixedly connected to a pressing block (304). A suction cup mounting plate (305) is arranged on the top of the support plate (101). A suction cup (306) is mounted on the suction cup mounting plate (305). A proximity sensor (307) is arranged on one side of the transition block (303).

2. The friction stir welding fixture for a battery box according to claim 1, characterized in that: At least four guide plates (102) are fixed on the top of the support plate (101). The four guide plates (102) are distributed in pairs on both sides of the support plate (101), and the guide plates (102) on both sides of the support plate (101) are arranged in a one-to-one correspondence.

3. The friction stir welding fixture for a battery box according to claim 1, characterized in that: The base (100) has a distribution box (103) and an electrical control box (104) on one side, and a solenoid valve (105) on the other side. The solenoid valve (105) has a solenoid valve cover (106) on its exterior.

4. The friction stir welding fixture for a battery box according to claim 1, characterized in that: The support plate (101) is fixed with lifting rings (107) at the four corners of its top.

5. The friction stir welding fixture for a battery box according to claim 3, characterized in that: The suction cup (306) is an electric suction cup. The solenoid valve (105), positioning cylinder (202), clamping cylinder (301), suction cup (306) and proximity sensor (307) are all electrically connected to the electrical control box (104).

6. The friction stir welding fixture for a battery box according to claim 1, characterized in that: The inner side of the positioning plate (201) is provided with an anti-scratch pad, which is made of rubber.

7. The friction stir welding fixture for a battery box according to claim 1, characterized in that: A shock-absorbing pad is provided between the suction cup mounting plate (305) and the support plate (101), and the shock-absorbing pad is made of polymer damping material.

Images