Battery pack welding device

Abstract

The utility model provides a battery pack welding device which comprises a supporting table, a welding mechanism is installed on the surface of the supporting table, a fixing mechanism used for placing a lower shell is installed on the surface of the supporting table, and a limiting mechanism used for fixing the connecting position of the lower shell and an upper shell is installed on the surface of the supporting table. The limiting mechanism comprises a connecting frame, the side wall of the connecting frame is fixedly connected with a plurality of sliding rods, and the two ends of a second hydraulic rod are rotationally connected with the connecting frame and the side wall of the supporting table correspondingly. The top end of the sliding rod is fixedly connected with a fixing block, the side wall of the fixing block is fixedly connected with a rubber belt with the arc-shaped side wall, a plurality of first protruding blocks and second protruding blocks with the arc-shaped side walls are installed on the bottom face of the rubber belt, and the rubber belt, the first protruding blocks and the second protruding blocks are flush with the surface of the lower shell and the surface of the upper shell. The battery pack welding device provided by the utility model has the advantages of reducing the shaking degree of the joint of the shell and improving the welding quality.

Description

Technical Field

[0001] This utility model relates to the field of battery pack welding technology, and in particular to a battery pack welding device. Background Technology

[0002] The new energy vehicle industry is currently one of the country's main development strategies. To effectively address factors such as environmental pollution, petroleum resource scarcity, and competition in the automotive market, the government has introduced numerous policies to encourage the vigorous development of new energy vehicles. In response to the national call for energy conservation and environmental protection, new energy vehicles have emerged, driving the rapid development of new energy vehicle technology. As a core component of new energy vehicles, the power battery pack's technological level directly affects battery performance and lifespan, placing higher demands on its reliability, standardization, cost, and assembly / manufacturing feasibility.

[0003] The power battery packs used in existing new energy vehicles are connected by screws and sealed with sealing rings. To prevent corrosion, the top cover is electrophoretically insulated, resulting in poor electrical continuity between the upper and lower casings. As a high-voltage component, a potential difference between the upper and lower casings of the battery pack can easily lead to safety issues for personnel handling it.

[0004] To ensure electrical continuity between the upper and lower shells, they are connected by friction stir welding, which creates a metallic connection and reduces the risk of failure. During the welding process, the welding head continuously rotates and rubs against the connection point of the shells, which can cause the connection point to wobble continuously, thus affecting the welding effect.

[0005] Therefore, it is necessary to provide a new battery pack welding device to solve the above problems. Utility Model Content

[0006] The technical problem solved by this utility model is to provide a battery pack welding device that reduces the degree of shaking at the shell connection and improves the welding quality.

[0007] To solve the above-mentioned technical problems, the battery pack welding device provided by this utility model includes: a support platform, a welding mechanism installed on the surface of the support platform, a fixing mechanism for placing the lower housing on the surface of the support platform, and a limiting mechanism for fixing the connection between the lower housing and the upper housing on the surface of the support platform; the limiting mechanism includes a connecting frame, a plurality of sliding rods are fixedly connected to the side wall of the connecting frame, and the two ends of a second hydraulic rod are respectively rotatably connected to the connecting frame and the side wall of the support platform; a guide sleeve for vertically guiding the sliding rods is installed on the surface of the support platform, a fixing block is fixedly connected to the top of the sliding rod, a rubber strip with an arc-shaped side wall is fixedly connected to the side wall of the fixing block, a plurality of first protrusions and second protrusions with arc-shaped side walls are installed on the bottom surface of the rubber strip, and the rubber strip, the first protrusions and the second protrusions are mounted on the surfaces of the lower housing and the upper housing.

[0008] Preferably, the welding mechanism includes a support frame, and a first screw and a first motor are installed on the side walls of both the support frame and the support platform. The output shaft of the first motor is fixedly connected to the first screw, and the first screw is threadedly connected to the support frame and the fixed box respectively. A first hydraulic rod is fixedly connected to the top of the fixed box. The bottom end of the first hydraulic rod is connected to a second motor for driving the friction stir welding head to rotate, and the second motor is slidably connected to the interior of the fixed box.

[0009] Preferably, the first screw on the side wall of the support platform and the first screw on the side wall of the support frame are perpendicular to each other; the side wall of the support frame is fixedly connected to a guide rod, and the side wall of the guide rod is slidably connected to a fixed box.

[0010] Preferably, the fixing mechanism includes a fixing plate, the surface of the support platform is rotatably connected to the fixing plate, a third motor is installed inside the support platform, the output shaft of the third motor is fixedly connected to the fixing plate, and the lower housing is placed on the surface of the fixing plate.

[0011] Preferably, the surface of the fixed plate is provided with a plurality of sliding grooves, the interior of the sliding grooves is rotatably connected to a second screw, and the second screw is threadedly connected to a locking block; the locking block is slidably connected to the interior of the sliding grooves, and the locking block with a trapezoidal top sidewall abuts against the sidewall of the lower housing.

[0012] Preferably, the length of the elastic rubber strip is greater than the length of the lower housing, and the first protrusion and the second protrusion are staggered on the bottom surface of the rubber strip.

[0013] Preferably, the surfaces of the first bump and the second bump are hook-shaped, and the orientation of the first bump is opposite to that of the second bump.

[0014] Compared with related technologies, the battery pack welding device provided by this utility model has the following advantages:

[0015] This utility model provides a battery pack welding device. Before welding, the lower housing is placed on the surface of the fixing mechanism. The second hydraulic rod is opened, and it retracts while rotating inside the support platform. The second hydraulic rod drives the connecting frame and the sliding rod downward. The sliding rod drives the fixing block and the rubber strip downward, causing the rubber strip to contact the surfaces of the upper and lower housings. The sliding rod drives the fixing block and the rubber strip downward, causing the elastic rubber strip with arc-shaped sidewalls to bend and deform downward, making it bend downward and fit tightly against the sidewall of the upper housing. This increases the stability of the upper and lower housings during the welding process and reduces shaking during the welding process. Multiple [unclear] components are installed on the sidewall of the rubber strip. During the process of the rubber band pressing the surface of the housing, the first and second protrusions are in close contact with the surface of the housing. The first and second protrusions, with their arc-shaped sidewalls, hook onto the surface of the housing, increasing the friction between the rubber band and the housing. Furthermore, the orientation of the first protrusion is opposite to that of the second protrusion. When the housing is about to move along the direction in which the first protrusion is facing, the orientation of the second protrusion is opposite to the direction of housing movement. The second protrusion hooks onto the housing, increasing the resistance to housing movement. Similarly, when the housing is about to move along the direction in which the second protrusion is facing, the first protrusion hooks onto the housing. This ensures that the two protrusions hook onto the housing from different directions, reducing the degree of housing sway and preventing misalignment of the housing during welding, thus improving welding quality. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the battery pack welding device provided by this utility model;

[0017] Figure 2 for Figure 1 The side view of the internal structure of the support platform shown;

[0018] Figure 3 for Figure 1 The top view of the fixed disk structure shown;

[0019] Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point A.

[0020] Figure 5 for Figure 1 The diagram shows a rubber band fixing the upper shell structure.

[0021] The following are the labeling elements in the diagram: 1. Support platform; 2. Welding mechanism; 21. Support frame; 22. First screw; 23. First motor; 24. Guide rod; 25. Fixing box; 26. First hydraulic rod; 27. Second motor; 28. Friction stir welding head; 3. Lower housing; 31. Upper housing; 4. Fixing mechanism; 41. Fixing plate; 42. Clamping block; 43. Second screw; 44. Slide groove; 45. Third motor; 5. Limiting mechanism; 51. Slide rod; 52. Fixing block; 53. Rubber belt; 54. Connecting frame; 55. Second hydraulic rod; 56. Guide sleeve; 57. First protrusion; 58. Second protrusion. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figures 1 to 5 , Figure 1 A schematic diagram of a preferred embodiment of the battery pack welding device provided by this utility model; Figure 2 for Figure 1 The side view of the internal structure of the support platform shown; Figure 3 for Figure 1 The top view of the fixed disk structure shown; Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point A. Figure 5 for Figure 1The diagram shows a schematic of the rubber band fixing the upper shell structure. The battery pack welding device includes: a support platform 1, with a welding mechanism 2 mounted on its surface. The welding mechanism 2 includes a support frame 21. A first screw 22 and a first motor 23 are mounted on the side walls of both the support frame 21 and the support platform 1. The output shaft of the first motor 23 is fixedly connected to the first screw 22. The first screw 22 is threadedly connected to both the support frame 21 and the fixing box 25. A first hydraulic rod 26 is fixedly connected to the top of the fixing box 25. A second motor 27, used to drive the friction stir welding head 28 to rotate, is connected to the bottom of the first hydraulic rod 26 and slidably connected to the interior of the fixing box 25. The first screw 22 on the side wall of the support platform 1 and the first screw 22 on the side wall of the support frame 21 are perpendicular to each other; the side wall of the support frame 21 is fixedly connected to the guide rod 24, and the side wall of the guide rod 24 is slidably connected to the fixed box 25, the guide rod 24 causing the fixed box 25 to move linearly; when the first motor 23 is turned on, the first motor 23 drives the first screw 22 to rotate, and using the principle of screw transmission, the first screw 23 drives the support frame 21 and the fixed box 25 to move; the first screw 23 on the side wall of the support platform 1 drives the support frame 21 and the fixed box 25 to move left and right, and the first screw 23 on the side wall of the support frame 21 drives the fixed box 25 to move back and forth, from The position of the friction stir welding head 28 is changed by moving it forward, backward, left, and right. During welding, the first hydraulic rod 26 drives the second motor 27 and the friction stir welding head 28 to move downward, so that the friction stir welding head 28 contacts the welding position. The second motor 27 is turned on, and the second motor 27 drives the friction stir welding head 28 to rotate continuously at the welding position. The heat generated causes local melting at the shell connection. When the first screw 23 rotates and drives the friction stir welding head 28 to move along the shell connection, the plasticized shell flows under the rotational friction force of the friction stir welding head 28 and forms a dense solid phase weld under the extrusion of the friction stir welding head 28, so that the shell is welded.

[0024] The surface of the support platform 1 is equipped with a fixing mechanism 4 for placing the lower housing 3. The fixing mechanism 4 includes a fixing plate 41, which is rotatably connected to the surface of the support platform 1. A third motor 45 is installed inside the support platform 1, and the output shaft of the third motor 45 is fixedly connected to the fixing plate 41. The lower housing 3 is placed on the surface of the fixing plate 41. In order to facilitate the third motor 45 to drive the fixing plate 41 and the lower housing 3 to rotate, the welding position on the surface of the lower housing 3 is aligned with the friction stir welding head 28.

[0025] The surface of the fixed disk 41 is provided with a plurality of sliding grooves 44. The interior of the sliding grooves 44 is rotatably connected to a second screw 43, and the second screw 43 is threadedly connected to a locking block 42. The locking block 42 is slidably connected to the interior of the sliding grooves 44. The locking block 42, with its top sidewall in the shape of a trapezoid, abuts against the sidewall of the lower housing 3. In order to facilitate the rotation of the second screw 43, according to the principle of screw drive, the second screw 43 drives the locking block 42 to move, so that the locking block 42 presses against the sidewall of the lower housing 3, thus fixing the lower housing 3 to the surface of the fixed disk 41.

[0026] The surface of the support platform 1 is equipped with a limiting mechanism 5 for fixing the connection between the lower housing 3 and the upper housing 31. The limiting mechanism 5 includes a connecting frame 54, with multiple sliding rods 51 fixedly connected to the side wall of the connecting frame 54. The two ends of a second hydraulic rod 55 are rotatably connected to the connecting frame 54 and the side wall of the support platform 1, respectively. The surface of the support platform 1 is equipped with a guide sleeve 56 for vertically guiding the sliding rods 51. A fixing block 52 is fixedly connected to the top of the sliding rod 51. A rubber strip 53 with an arc-shaped side wall is fixedly connected to the side wall of the fixing block 52. Multiple first protrusions 57 and second protrusions 58 with arc-shaped side walls are installed on the bottom surface of the rubber strip 53. The rubber strip 53, the first protrusions 57, and the second protrusions 58 are mounted on the bottom surface of the lower housing 3 and the upper housing 31. The surfaces of the first protrusions 57 and the second protrusions 58 are hook-shaped, and the orientation of the first protrusions 57 is opposite to that of the second protrusions 58. When the slide rod 51 moves the fixing block 52 and the rubber band 53 downwards, causing the rubber band 53 to abut against the surfaces of the upper housing 3 and the lower housing 31, the slide rod 51 moves the fixing block 52 and the rubber band 53 downwards. The elastic rubber band 53, with its arc-shaped sidewalls, bends and deforms downwards, causing it to bend and press tightly against the sidewall of the upper housing 3 (as shown in the attached figure). Figure 5As shown, this increases the stability of the upper housing 3 and the lower housing 31 during the welding process and reduces the shaking during the welding process. Multiple first protrusions 57 and second protrusions 58 are installed on the sidewalls of the rubber band 53. During the process of the rubber band 53 pressing against the housing surface, the first protrusions 57 and second protrusions 58 are in close contact with the housing surface. The arc-shaped first protrusions 57 and second protrusions 58 hook onto the housing surface, increasing the friction between the rubber band 53 and the housing. Furthermore, the orientation of the first protrusion 57 is opposite to that of the second protrusion 58. When the housing is about to move along the direction of the first protrusion 57, the orientation of the second protrusion 58 is opposite to the direction of housing movement. The second protrusion 58 hooks onto the housing, increasing the resistance to housing movement. Similarly, when the housing is about to move along the direction of the second protrusion 58, the first protrusion 57 hooks onto the housing, so that the two protrusions hook onto the housing from different directions, reducing the degree of housing shaking.

[0027] The length of the elastic rubber strip 53 is greater than the length of the lower housing 3. In order to facilitate the rubber strip 53 to press the surface of the lower housing 3, the first protrusion 57 and the second protrusion 58 are staggered on the bottom surface of the rubber strip 53. In order to increase the friction between the protrusion and the housing and reduce the degree of shaking of the housing during the welding process.

[0028] The working principle of this utility model is as follows: The lower housing 3 is placed on the surface of the fixed plate 41. The second screw 43 is rotated, and according to the principle of screw transmission, the second screw 43 drives the locking block 42 to move, causing the locking block 42 to press against the side wall of the lower housing 3, fixing the lower housing 3 to the surface of the fixed plate 41. Then, the upper housing 31 is engaged with the lower housing 3. The device is connected to an external power source, and the second hydraulic rod 55 is turned on. The second hydraulic rod 55 retracts and rotates inside the support platform 1. The second hydraulic rod 55 drives the connecting frame 54 and the sliding rod 51 to move downwards. The sliding rod 51 drives the fixing block 52 and the rubber belt 53 to move downwards, causing the rubber belt 53 to contact the surfaces of the upper housing 3 and the lower housing 31. The sliding rod 51 drives the fixing block 52 and the rubber belt 53 to move downwards, causing the elastic rubber belt 53 with its arc-shaped sidewalls to bend downwards. The deformation causes the rubber strip 53 to bend downwards and fit tightly against the side wall of the upper housing 3, increasing the stability of the upper housing 3 and the lower housing 31 during the welding process and reducing shaking during the welding process. Multiple first protrusions 57 and second protrusions 58 are installed on the side wall of the rubber strip 53. During the process of the rubber strip 53 pressing against the housing surface, the first protrusions 57 and second protrusions 58 are tightly attached to the housing surface, and the arc-shaped first protrusions 57 and second protrusions 58 hook onto the housing surface, increasing the friction between the rubber strip 53 and the housing. The third motor 45 is activated, causing the fixed plate 41 and the housing to rotate, aligning the welding position on the housing surface with the friction stir welding head 28. Turn on the first motor 23. The first motor 23 drives the first screw 22 to rotate. Utilizing the principle of screw transmission, the first screw 23 drives the support frame 21 and the fixed box 25 to move. The first screw 23 on the side wall of the support platform 1 drives the support frame 21 and the fixed box 25 to move left and right. The first screw 23 on the side wall of the support frame 21 drives the fixed box 25 to move back and forth, thereby changing the position of the friction stir welding head 28 in all directions. Position the friction stir welding head 28 directly above the welding position. Turn on the first hydraulic rod 26. 26 drives the second motor 27 and the friction stir welding head 28 to move downwards, so that the friction stir welding head 28 contacts the welding position. The second motor 27 is turned on, and the second motor 27 drives the friction stir welding head 28 to rotate continuously at the welding position. The heat generated causes local melting at the shell connection. When the first screw 23 rotates and drives the friction stir welding head 28 to move along the shell connection, the plasticized shell flows under the rotational friction force of the friction stir welding head 28 and forms a dense solid phase weld under the extrusion of the friction stir welding head 28, so that the shell is welded.During the welding process, the welding direction of the shell is parallel to the surface of the rubber strip 53. When the shell is about to move along the direction in which the first protrusion 57 is facing, the direction in which the second protrusion 58 is facing is opposite to the direction of the shell's movement. The second protrusion 58 hooks onto the shell, increasing the resistance to the shell's movement. Similarly, when the shell is about to move along the direction in which the second protrusion 58 is facing, the first protrusion 57 hooks onto the shell, so that the two protrusions hook onto the shell from different directions, reducing the degree of shell shaking.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A battery pack welding device, characterized in that, include: Support platform (1), welding mechanism (2) is installed on the surface of the support platform (1), fixing mechanism (4) for placing the lower housing (3) is installed on the surface of the support platform (1), and limiting mechanism (5) for fixing the connection between the lower housing (3) and the upper housing (31) is installed on the surface of the support platform (1). The limiting mechanism (5) includes a connecting frame (54), a plurality of sliding rods (51) are fixedly connected to the side wall of the connecting frame (54), and the two ends of the second hydraulic rod (55) are rotatably connected to the side wall of the connecting frame (54) and the support platform (1); the surface of the support platform (1) is equipped with a guide sleeve (56) for vertically guiding the sliding rod (51), the top end of the sliding rod (51) is fixedly connected to a fixing block (52), the side wall of the fixing block (52) is fixedly connected to a rubber strip (53) with an arc-shaped side wall, the bottom surface of the rubber strip (53) is equipped with a plurality of first protrusions (57) and second protrusions (58) with arc-shaped side walls, and the rubber strip (53), the first protrusions (57) and the second protrusions (58) are connected to the surface of the lower housing (3) and the upper housing (31).

2. The battery pack welding apparatus according to claim 1, characterized in that, The welding mechanism (2) includes a support frame (21). The side walls of the support frame (21) and the support platform (1) are equipped with a first screw (22) and a first motor (23). The output shaft of the first motor (23) is fixedly connected to the first screw (22). The first screw (22) is threadedly connected to the support frame (21) and the fixed box (25) respectively. The top of the fixed box (25) is fixedly connected to a first hydraulic rod (26). The bottom end of the first hydraulic rod (26) is connected to a second motor (27) for driving the friction stir welding head (28) to rotate. The second motor (27) is slidably connected to the inside of the fixed box (25).

3. The battery pack welding apparatus according to claim 2, characterized in that, The first screw (22) on the side wall of the support platform (1) is perpendicular to the first screw (22) on the side wall of the support frame (21); the side wall of the support frame (21) is fixedly connected to the guide rod (24), and the side wall of the guide rod (24) is slidably connected to the fixed box (25).

4. The battery pack welding apparatus according to claim 1, characterized in that, The fixing mechanism (4) includes a fixing disk (41), the surface of the support platform (1) is rotatably connected to the fixing disk (41), a third motor (45) is installed inside the support platform (1), the output shaft of the third motor (45) is fixedly connected to the fixing disk (41), and the lower housing (3) is placed on the surface of the fixing disk (41).

5. The battery pack welding apparatus according to claim 4, characterized in that, The surface of the fixed plate (41) is provided with a plurality of sliding grooves (44), the interior of the sliding grooves (44) is rotatably connected to a second screw (43), the second screw (43) is threadedly connected to a locking block (42); the locking block (42) is slidably connected to the interior of the sliding grooves (44), and the locking block (42) with a trapezoidal top sidewall abuts against the sidewall of the lower housing (3).

6. The battery pack welding apparatus according to claim 1, characterized in that, The elastic rubber strip (53) is longer than the lower housing (3), and the first protrusion (57) and the second protrusion (58) are staggered on the bottom surface of the rubber strip (53).

7. The battery pack welding apparatus according to claim 1, characterized in that, The surfaces of the first protrusion (57) and the second protrusion (58) are hook-shaped, and the orientation of the first protrusion (57) is opposite to that of the second protrusion (58).

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