An integrated device for assembling and laser welding of a lithium battery cover plate and a control method thereof

Abstract

The application discloses a kind of integrated device for assembling and laser welding of lithium battery cover plate, it includes multiple pressing mechanisms, multiple unlocking mechanisms, the pressing mechanism is fixedly connected with carousel and rotates with carousel, and the unlocking mechanism is fixedly connected with rack and does not rotate;When carousel stops, the position of pressing mechanism and unlocking mechanism corresponds one by one;When the pressing mechanism comes to the station of unlocking mechanism, the unlocking mechanism moves inward to release the pressure of the pressing mechanism, and place the parts;After the completion of part placement, the unlocking mechanism moves outward, and the pressing mechanism presses the parts;When all parts pass through the preceding multiple stations in sequence and finally all are assembled, laser welding is carried out.The application can install and reliably press each part of the cover plate in each station in sequence.At the same time, the application ensures the position between parts, simplifies the process flow and equipment structure.

Description

Technical Field

[0001] This invention relates to a carrier in a square battery cover assembly device for automotive power batteries and energy storage batteries. Background Technology

[0002] Currently, lithium battery covers are extremely important for ensuring the quality of lithium batteries. To guarantee the final quality of the lithium battery cover, the accuracy of the relative positions of the components such as the cover plate, sealing ring, terminal post, and mica sheet must be ensured during the assembly process of the cover plate assembly, followed by laser welding. Because the components are small and numerous, manual operation is unsuitable, and manual placement of the components is prone to errors. Therefore, a device is needed to facilitate the assembly and welding of lithium battery covers.

[0003] CN 113561495 A (publication date 2021.10.29) discloses a multi-station fixture for welding lithium battery cover plates. While it can clamp parts during assembly, it has the following drawbacks: 1. The cylinder 401 is located at the lower part of the support ring 30. To ensure its installation and extension stroke, the height of the column 31 must have a lower limit, resulting in a relatively high overall height, which occupies space and affects the stability of the overall equipment. 2. When the piston end of the cylinder 401 retracts, the top plate 403 moves downward, and the vertical slide 202 rapidly descends under the vertical tension spring 207 and its own weight, causing the bottom support 203 to descend accordingly. This causes the assembled parts placed on top to also descend, failing to guarantee the position between parts and affecting the subsequent welding quality. 3. The merging distance of the clamps 206 is not limited, resulting in poor reliability. 4. The cover plate is welded using ultrasonic welding, requiring support from a bottom mold during the welding station; therefore, this structure cannot be applied to laser welding. Summary of the Invention

[0004] The problem this invention aims to solve is to provide an integrated device for assembling and laser welding lithium battery cover plates, which can sequentially install and reliably clamp the various components constituting the cover plate at each station. Simultaneously, this invention ensures accurate positioning of the components, simplifying the process flow and equipment structure. Furthermore, this invention also provides a control method for the integrated device for assembling and laser welding lithium battery cover plates.

[0005] This invention discloses an integrated device for assembling and laser welding lithium battery cover plates. It includes multiple clamping mechanisms and multiple unlocking mechanisms. The clamping mechanisms are fixedly connected to a turntable and rotate with it, while the unlocking mechanisms are fixedly connected to a frame and do not rotate. When the turntable is stationary, the positions of the clamping and unlocking mechanisms correspond one-to-one. When a clamping mechanism reaches the station of an unlocking mechanism, the unlocking mechanism moves inward to release the clamping mechanism and place the part. After the part is placed, the unlocking mechanism moves outward, and the clamping mechanism clamps the part. Laser welding is performed after all parts have passed through the preceding multiple stations and are finally assembled.

[0006] Furthermore, the clamping mechanism includes a cover plate positioning block, two L-shaped pressure heads on the left and right, two symmetrically arranged moving components on the left and right, and two symmetrically arranged roller assemblies on the left and right. Each moving component includes an L-shaped mounting base, a horizontal moving unit, and a vertical moving unit. The inside of the cover plate positioning block is fixedly connected to the turntable, and the outside is the cover plate placement part. The L-shaped mounting base is located below the cover plate positioning block and is connected to the cover plate positioning block through the horizontal moving unit. The L-shaped pressure heads are located on the left and right sides of the cover plate positioning block, with their horizontal edges located above the cover plate placement part of the cover plate positioning block, and their vertical edges connected to the L-shaped mounting base through the vertical moving unit. The roller assemblies are connected to the L-shaped pressure heads and the L-shaped mounting base.

[0007] Furthermore, the lateral movement unit includes a lateral guide rail, a lateral slider, and two tension spring units (front and rear). Each tension spring unit includes a lateral tension spring, a small connecting block I, and a small connecting block II. The vertical movement unit includes a vertical slider, a vertical guide rail, and two tension spring units (front and rear). Each tension spring unit includes a vertical tension spring, a small connecting block III, and a small connecting block IV. The lateral guide rail is fixed below the cover plate positioning block, and the lateral slider is fixed above the horizontal edge of the L-shaped mounting base. The lateral slider mates with the lateral guide rail. Small connecting block I is fixed below the cover plate positioning block. Small connecting block II is fixed to the upper part of the outer side of the vertical side of the L-shaped mounting base. The two ends of the horizontal tension spring are respectively connected to the opening slots on small connecting block I and small connecting block II. The vertical slider is fixed to the inner side of the vertical side of the L-shaped pressure head, and the vertical guide rail is fixed to the outer side of the vertical side of the L-shaped mounting base. The vertical slider and the vertical guide rail cooperate. Small connecting block III is fixed to the lower part of the horizontal side of the L-shaped pressure head, and small connecting block IV is fixed to the middle part of the outer side of the vertical side of the L-shaped mounting base. The two ends of the vertical tension spring are respectively connected to the opening slots on small connecting block III and small connecting block IV.

[0008] Furthermore, the roller assembly includes a horizontal roller mounting base, a horizontal roller, and a vertical roller. The horizontal roller mounting base is fixedly connected to the lower part of the inner side of the vertical side of the L-shaped mounting base, and the horizontal roller is connected to the horizontal roller mounting base. The vertical roller is connected to the lower part of the vertical side of the L-shaped pressure head. The unlocking mechanism includes a connecting plate, a cylinder, two guide rails, an unlocking push plate, and two small push plates. The connecting plate is fixed on the frame, and the cylinder and the left and right guide rails are both fixed on the top of the connecting plate. The two guide rails are located on the left and right sides of the cylinder. The middle part of the unlocking push plate is connected to the rod part of the cylinder, and its left and right ends are connected to the guide rails through the lower sliders. The two small push plates are symmetrically fixed on the top of the unlocking push plate. The surface of the unlocking push plate opposite to the pressing mechanism is an inclined vertical roller contact surface, and the surfaces of the two small push plates opposite to the pressing mechanism are inclined horizontal roller contact surfaces.

[0009] Furthermore, the roller assembly also includes a caster mounting base and a caster. The caster mounting base is fixedly connected to the lower part of the outer side of the vertical edge of the L-shaped pressure head, and the caster is connected to the caster mounting base. The lowest part of the caster's rotating surface is lower than the lower generatrix of the vertical roller's rotating surface.

[0010] Furthermore, the clamping mechanism also includes a pressure head copper nozzle, which is fixed at the lower part of the inner hole of the L-shaped pressure head, and the pressure head copper nozzle is a contour-following pressure head.

[0011] Furthermore, the moving component also includes a limiting unit, which includes a large connecting seat, two small connecting seats, two rivets, and two positioning bolts. The large connecting seat is fixed below the cover plate positioning block and located in the middle of the two left and right transverse guide rails. A rivet is connected to each of the left and right end faces of the large connecting seat. The two small connecting seats are respectively fixed below the transverse sides of the two L-shaped mounting seats. The positioning bolts pass through the small connecting seats, and their end faces are opposite to the rivets.

[0012] Furthermore, the integrated assembly and laser welding device also includes a detection unit, which includes left and right stops, left and right mounting strips, and left and right sensors. The two stops are respectively fixed on the horizontal sides of the two L-shaped mounting bases and are arranged symmetrically on the left and right. The mounting strips are fixed on the connecting plate, and the sensors are fixed on the upper part of the mounting strips and are arranged opposite to the stops in front and behind.

[0013] This invention discloses a control method for an integrated device for assembling and laser welding lithium battery cover plates, comprising the following steps: Step 1: A turntable drives a clamping mechanism to rotate to the unlocking mechanism position; Step 2: A cylinder operates to push an unlocking push plate inward, the vertical roller contact surface contacts the vertical roller, pushing the left and right L-shaped pressure heads upward; when the L-shaped pressure heads stop moving upward, the horizontal roller contact surface contacts the horizontal roller, pushing the left and right L-shaped pressure heads outward simultaneously, placing the part on the cover plate positioning block; Step 3: After the part is placed, the cylinder operates to push the unlocking push plate outward, the horizontal tension spring drives the left and right L-shaped pressure heads inward to merge; the vertical tension spring force drives the left and right L-shaped pressure heads downward, so that the inside of the horizontal edge of the L-shaped pressure head clamps the part on the cover plate positioning block; Step 4: The turntable drives the clamping mechanism to rotate to the next unlocking mechanism position, repeating the above steps to place the next part.

[0014] Furthermore, the number of clamping and unlocking mechanisms is the same as the number of cover plate parts, ensuring that all parts are assembled when the last welding station is reached.

[0015] The advantages of this integrated device for assembling and laser welding lithium battery cover plates are as follows: 1. The two L-shaped pressure heads can move up, down, left, and right, enabling the assembly of different parts. Even as the height increases after assembly, the L-shaped pressure heads reliably press and limit the parts. 2. The cylinder is horizontally positioned, pushing the unlocking plate inwards and outwards. This eliminates requirements on the overall height of the frame, minimizes space requirements, and ensures good overall stability. Simultaneously, when placing the workpiece, the L-shaped pressure heads move upwards and outwards, while the cover plate positioning block remains stable, ensuring the correct placement of parts and thus guaranteeing subsequent welding quality. 3. The stopping position of the L-shaped pressure heads during inward movement and merging can be adjusted to ensure reliability. 4. A detection unit monitors the reliability of the opening and merging of the L-shaped pressure heads to prevent damage to the equipment. 5. The L-shaped pressure heads integrate copper nozzles as welding heads, pressing down on the areas to be welded after assembly for laser welding, simplifying the process and equipment structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention. Figure 1 (The clamping mechanism and the unlocking mechanism are separated).

[0017] Figure 2 This is a schematic diagram of the present invention. Figure 2 (The clamping mechanism comes into contact with the unlocking mechanism).

[0018] Figure 3 This is a schematic diagram of the clamping mechanism.

[0019] Figure 4This is a schematic diagram of the unlocking mechanism.

[0020] Figure 5 This is a schematic diagram showing the clamping process after the cover plate body is installed.

[0021] Figure 6 This is a diagram showing the clamping process after installing the pole and sealing ring.

[0022] Figure 7 This is a diagram showing the clamping process after installing the mica sheet.

[0023] Figure 8 This is a schematic diagram showing the situation when the welding ring is not tightened after installation.

[0024] Figure 9 This is a schematic diagram showing the tightening process after the welding ring is installed.

[0025] Figure 10 This is a schematic diagram of laser welding. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] from Figure 1 , Figure 2 As can be seen, the present invention provides an integrated device for assembling and laser welding lithium battery cover plates, which includes multiple clamping mechanisms and multiple unlocking mechanisms. The clamping mechanisms are fixedly connected to the turntable 1 and rotate with the turntable 1, while the unlocking mechanisms are fixedly connected to the frame 2 and do not rotate. When the turntable is stationary, the positions of the clamping mechanisms and the unlocking mechanisms correspond one-to-one. When the clamping mechanism reaches the station of the unlocking mechanism, the unlocking mechanism moves inward to release the clamping mechanism and place the part. After the part is placed, the unlocking mechanism moves outward, and the clamping mechanism clamps the part. When all the parts have passed through the previous multiple stations and are finally assembled, laser welding is performed.

[0029] When assembling the lithium battery cover, the assembly equipment consists of an internally rotating turntable 1 and an externally fixed frame 2. Multiple unlocking mechanisms are fixed to the frame 2 and do not rotate with the turntable, while multiple clamping mechanisms are fixedly connected to the turntable 1 and rotate with it. When the turntable drives the clamping mechanism to the unlocking mechanism position, the unlocking mechanism actuates to open the clamping mechanism, allowing parts to be loaded. After loading is completed, the unlocking mechanism moves away, and the clamping mechanism clamps the parts and rotates to the next unlocking mechanism. The next unlocking mechanism actuates to open the clamping mechanism, allowing the next part to be loaded. After loading is completed, the unlocking mechanism moves away, and the clamping mechanism clamps the next part, until all parts are assembled and then welded.

[0030] Example 2

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, the integrated device for assembly and laser welding of the present invention includes a clamping mechanism comprising a cover plate positioning block 10, two L-shaped pressure heads 11 on the left and right, two symmetrically arranged moving components on the left and right, and two symmetrically arranged roller assemblies on the left and right. Each moving component includes an L-shaped mounting base 12, a horizontal moving unit, and a vertical moving unit. The interior of the cover plate positioning block 10 is fixedly connected to the turntable, and the exterior is a cover plate placement part. The L-shaped mounting base 12 is located below the cover plate positioning block 10 and is connected to the cover plate positioning block 10 through the horizontal moving unit. The L-shaped pressure heads 11 are located on the left and right sides of the cover plate positioning block 10, with their horizontal sides located above the cover plate placement part of the cover plate positioning block 10, and their vertical sides connected to the L-shaped mounting base 12 through the vertical moving unit. The roller assemblies are connected to the L-shaped pressure heads 11 and the L-shaped mounting base 12.

[0032] The battery cover is placed inside the cover positioning block 10. The L-shaped pressure head 11 moves left, right, up, and down through the roller assembly, vertical moving unit, and horizontal moving unit, so that the two L-shaped pressure heads 11 on the left and right can open and close, thereby realizing the placement of parts and the pressing of parts.

[0033] Example 3

[0034] like Figure 1 , Figure 2 , Figure 3 As shown, the integrated device for assembly and laser welding of the present invention includes: a transverse moving unit comprising a transverse guide rail 13, a transverse slider 14, and two front and rear tension spring units, each tension spring unit comprising a transverse tension spring 15, a small connecting block I 16, and a small connecting block II 17; a vertical moving unit comprising a vertical slider 18, a vertical guide rail 19, and two front and rear tension spring units, each tension spring unit comprising a vertical tension spring 20, a small connecting block III 21, and a small connecting block IV 22; the transverse guide rail 13 is fixed below the cover plate positioning block 10, and the transverse slider 14 is fixed above the transverse side of the L-shaped mounting base 12, with the transverse slider 14 cooperating with the transverse guide rail 13; the small connecting block I 16 is fixed to the cover plate positioning block 10. Below block 10, small connecting block II 17 is fixed to the upper part of the outer side of the vertical side of L-shaped mounting base 12, and the two ends of the transverse tension spring 15 are respectively connected to the opening slots on small connecting block I 16 and small connecting block II 17; vertical slider 18 is fixed to the inner side of the vertical side of L-shaped pressure head 11, and vertical guide rail 19 is fixed to the outer side of the vertical side of L-shaped mounting base 12, with vertical slider 18 cooperating with vertical guide rail 19; small connecting block III 21 is fixed below the horizontal side of L-shaped pressure head 11, and small connecting block IV 22 is fixed to the middle part of the outer side of the vertical side of L-shaped mounting base 12, with the two ends of the vertical tension spring 20 respectively connected to the opening slots on small connecting block III 21 and small connecting block IV 24.

[0035] The present invention provides an integrated device for assembly and laser welding: the two left and right L-shaped mounting bases 12 move left and right along the horizontal guide rail 13 via the horizontal slider 14, thereby driving the two left and right L-shaped pressure heads 11 to move left and right. The two left and right L-shaped pressure heads 11 move up and down along the vertical guide rail 19 via the vertical slider 18, thereby realizing the left and right and up and down movement of the two left and right L-shaped pressure heads 11.

[0036] When there are no parts on the cover plate positioning block 10, the clamping mechanism follows the turntable to the first unlocking mechanism position and stops. The unlocking mechanism contacts the clamping mechanism, causing the two L-shaped pressure heads 11 to move upward and outward. After placing the first part on the cover plate positioning block, the unlocking mechanism leaves the clamping mechanism. Under the action of the horizontal tension spring, the two L-shaped mounting seats 12 are tightened towards the center line of the clamping mechanism, which drives the two L-shaped pressure heads to move inward. At the same time, under the action of the vertical tension spring, the two L-shaped pressure heads are tightened downward, which causes the L-shaped pressure heads to move downward, so that the inside of the horizontal edge of the L-shaped pressure head presses the cover plate part placed on the cover plate positioning block. The clamping mechanism is always in a clamping state during the rotation of the turntable. When the device stops at the next unlocking mechanism position, the unlocking mechanism contacts the clamping mechanism, causing the two L-shaped pressure heads to move upward and outward, placing the second part onto the cover plate positioning block. After that, the unlocking mechanism leaves the clamping mechanism, and the clamping mechanism clamps the part. This cycle continues until all the parts required for cover plate assembly are placed on the cover plate positioning block before proceeding with the subsequent welding work.

[0037] Example 4

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the present invention assembles an integrated device for laser welding: the roller assembly includes a horizontal roller mounting base 27, a horizontal roller 28, and a vertical roller 29. The horizontal roller mounting base 27 is fixedly connected to the lower part of the inner side of the vertical side of the L-shaped mounting base 12, and the horizontal roller 28 is connected to the horizontal roller mounting base 27; the vertical roller 29 is connected to the lower part of the vertical side of the L-shaped pressure head 11; the unlocking mechanism includes a connecting plate 40, a cylinder 41, two guide rails 42, an unlocking push plate 43, and two small push plates 44; the connecting plate 41 is fixed to... On the frame, cylinder 41 and left and right guide rails 42 are fixed on the top of connecting plate 41, and the two guide rails 42 are located on the left and right sides of cylinder 41; the middle part of unlocking push plate 43 is connected to the rod part of cylinder 41, and its left and right ends are connected to guide rails 42 through the lower sliders; two small push plates 44 are symmetrically fixed on the top of unlocking push plate 43; the surface of unlocking push plate 43 opposite to the pressing mechanism is an inclined vertical roller contact surface 45, and the surface of the two small push plates 44 opposite to the pressing mechanism is an inclined horizontal roller contact surface 46.

[0039] When the clamping mechanism reaches the unlocking mechanism's position, the cylinder 41 works to push the unlocking push plate 43 inward. The vertical roller contact surface 45 first contacts the vertical roller 29 through its lower part and then further pushes the vertical roller upward, causing the L-shaped pressure head 11 to move upward. When the vertical roller 29 contacts the upper surface 47 of the unlocking push plate 43, the L-shaped pressure head 11 stops moving upward. As the unlocking push plate 43 continues to move inward, the transverse roller contact surface 46 first contacts the transverse roller 28 through its inner surface and then further pushes the transverse roller outward, realizing the opening between the two L-shaped pressure heads, thereby releasing the part and placing the new part into the fixed plate positioning block 10. Once the new part is placed, cylinder 41 activates, pushing the unlocking push plate 43 outwards away from the clamping mechanism. At this time, under the tension of the transverse tension spring 15, the two L-shaped mounting seats 12 tighten towards the center line of the clamping mechanism, causing the two left and right L-shaped pressure heads to move inwards and merge. Simultaneously, under the force of the vertical tension spring 20, the two L-shaped pressure heads tighten downwards, causing the interior of the transverse side of the L-shaped pressure heads to clamp the cover plate parts placed on the cover plate positioning block 10. This cycle ensures reliable clamping of cover plate parts placed sequentially according to the assembly order.

[0040] In the integrated assembly and laser welding device of this invention, the cylinder 41 is horizontally positioned. During operation, it pushes the unlocking push plate to move inward and outward (i.e., to contact or move away from the clamping mechanism). Therefore, there are no requirements for the overall height of the frame, the space occupied can be small, and the overall structure has good stability. At the same time, the vertical roller contact surface of the unlocking push plate 43 causes the L-shaped pressure head to move upward, and the horizontal roller contact surface of the small push plate 44 causes the L-shaped pressure head to move outward. Meanwhile, the cover plate positioning block 10 for placing parts remains stable and stationary. Only the relevant parts need to be placed on it, ensuring the position between the parts and thus ensuring the welding quality in the later stage.

[0041] Example 5

[0042] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, in the integrated assembly and laser welding device of the present invention: the roller assembly also includes a universal wheel mounting base 30 and a universal wheel 31. The universal wheel mounting base 30 is fixedly connected to the lower part of the outer side of the vertical side of the L-shaped pressure head 11, and the universal wheel 31 is connected to the universal wheel mounting base 30. The lowest part of the rotating surface of the universal wheel 31 is lower than the lower generatrix of the rotating surface of the vertical roller 29.

[0043] When the L-shaped pressure head 11 stops moving upward and starts moving outward, the universal wheel 31 contacts the upper surface 47 of the unlocking push plate 44, so that the vertical roller 28 does not contact the upper surface of the unlocking push plate, thus avoiding damage caused by friction of the vertical roller along the non-rotating direction.

[0044] Example 6

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the integrated device for assembly and laser welding of the present invention includes a clamping mechanism that further includes a pressure head copper nozzle 32, which is fixed at the lower part of the inner hole of the L-shaped pressure head 11. The pressure head copper nozzle 32 is a contour-following pressure head.

[0046] The pressure head copper nozzle 32 is set inside the L-shaped pressure head 11. The pressure head copper nozzle 32 limits and reliably presses each part. At the same time, when the welding ring needs to be laser welded after the parts are assembled, there is no longer a special pressure head to press down the position to be welded, thus simplifying the process and equipment structure.

[0047] In the final assembly welding station, the welding head, driven by an electric cylinder, pushes the cover plate upwards, causing it to move upwards and detach from the surface of the cover plate positioning block. The cover plate, along with the L-shaped pressure head and its copper nozzle, moves upwards and eventually adheres to the pressure head's dead stop. The electric cylinder continues to move, compressing the sealing ring to the amount required by the customer before stopping. Laser welding then begins. After welding, the welding head descends, and the L-shaped pressure head and its copper nozzle, under the force of a vertical tension spring, return the cover plate to the surface of the cover plate positioning block.

[0048] Example 7

[0049] like Figure 1 , Figure 2 , Figure 3 As shown, the integrated device for assembly and laser welding of the present invention includes a moving component and a limiting unit. The limiting unit includes a large connecting seat 23, two small connecting seats 24, two rivets 25, and two positioning bolts 26. The large connecting seat 23 is fixed below the cover plate positioning block 10 and is located in the middle of the two left and right transverse guide rails 13. A rivet 25 is connected to each of the left and right end faces of the large connecting seat 23. The two small connecting seats 24 are respectively fixed below the transverse sides of the two L-shaped mounting seats 12. The positioning bolts 26 pass through the small connecting seats 24 and their end faces are opposite to the rivets 25.

[0050] By adjusting the position of the positioning bolt 26, the distance between its end face and the impact pin 25 is changed, thereby adjusting the position where the L-shaped mounting base 12, i.e. the L-shaped pressure head 11, stops when it moves inward and merges.

[0051] Example 8

[0052] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the integrated device for assembly and laser welding of the present invention also includes a detection unit, which includes left and right stops 33, left and right mounting strips 48, and left and right sensors 49. The two stops 33 are respectively fixed on the horizontal sides of the two L-shaped mounting bases 12 and are arranged symmetrically on the left and right. The mounting strips 48 are fixed on the connecting plate 40, and the sensors 49 are fixed on the upper part of the mounting strips 48 and are arranged opposite to the stops 33.

[0053] When sensor 49 detects that the stop block 33 moves left and right with the L-shaped mounting base 12, it indicates that the L-shaped pressure head 11 can be opened and closed to achieve the corresponding function; otherwise, maintenance is required.

[0054] Example 9

[0055] The present invention discloses a control method for an integrated assembly and laser welding device, comprising the following steps: Step 1: The turntable 1 drives the clamping mechanism to rotate to the unlocking mechanism position; Step 2: The cylinder 41 operates to push the unlocking push plate 43 inward, the vertical roller contact surface 45 contacts the vertical roller 29, and pushes the left and right L-shaped pressure heads 11 upward; when the L-shaped pressure heads 11 stop moving upward, the horizontal roller contact surface 46 contacts the horizontal roller 28, and pushes the left and right L-shaped pressure heads outward simultaneously, placing the part on the cover plate positioning block 10; Step 3: After the part is placed, the cylinder 41 operates to push the unlocking push plate 43 outward, the horizontal tension spring 15 drives the left and right L-shaped pressure heads 11 inward to merge; the vertical tension spring 20 drives the left and right L-shaped pressure heads 11 downward, so that the inside of the horizontal edge 11 of the L-shaped pressure head presses the part on the cover plate positioning block 10; Step 4: The turntable 1 drives the clamping mechanism to rotate to the next unlocking mechanism position, and the above steps are repeated to place the next part.

[0056] Figure 5 This is a schematic diagram of the clamping process after the cover plate body 51 is installed; Figure 6 A schematic diagram showing the clamping process after installing the pole post 52 and the sealing ring 53; Figure 7 This is a diagram illustrating the clamping process after installing mica sheet 54; Figure 8 This is a schematic diagram showing the situation when the welding ring is not tightened after installation (55mm). Figure 9 This is a schematic diagram showing the 55mm clamping position after the welding ring is installed; Figure 10 This is a schematic diagram of laser welding.

[0057] The number of clamping and unlocking mechanisms is the same as the number of cover plate parts, ensuring that all parts are assembled when the last welding station is reached.

[0058] The principle of the integrated assembly and laser welding device of the present invention is as follows: the clamping mechanism is installed on the turntable and rotates with the turntable. The parts are installed at each working position, that is, at the fixed position of the unlocking mechanism. Before each installation, the two L-shaped pressure heads move vertically upward and then horizontally outward to ensure that there is no interference when placing the parts. After each installation is completed, the two L-shaped pressure heads move horizontally inward and then vertically downward to clamp the parts.

[0059] The advantages of this integrated assembly and laser welding device are as follows: 1. The two L-shaped pressure heads can move up, down, left, and right, enabling the assembly of different parts. Even as the height increases after assembly, the L-shaped pressure heads reliably clamp and limit the parts. 2. The cylinder is horizontally positioned, pushing the unlocking plate inwards and outwards. This eliminates requirements on the overall height of the frame, occupies less space, and provides good overall stability. Simultaneously, when placing the workpiece, the L-shaped pressure heads move upwards and outwards, while the cover plate positioning block remains stable, ensuring the correct placement of parts and thus guaranteeing welding quality. 3. The stopping position of the L-shaped pressure heads during inward movement and merging can be adjusted to ensure reliability. 4. A detection unit monitors the reliability of the opening and closing of the L-shaped pressure heads to prevent damage to the equipment. 5. The L-shaped pressure heads integrate copper nozzles as welding heads, pressing down on the areas to be welded after assembly for laser welding, simplifying the process and equipment structure.

Claims

1. An integrated device for assembling and laser welding lithium battery cover plates, characterized in that: It includes multiple clamping mechanisms and multiple unlocking mechanisms. The clamping mechanism is fixedly connected to the turntable (1) and rotates with the turntable (1). The unlocking mechanism is fixedly connected to the frame (2) and does not rotate. When the turntable (1) is stationary, the positions of the clamping mechanism and the unlocking mechanism correspond one-to-one. When the clamping mechanism arrives at the station of the unlocking mechanism, the unlocking mechanism moves inward to depress the clamping mechanism and place the part. After the part is placed, the unlocking mechanism moves outward and the clamping mechanism clamps the part. When all the parts have passed through the previous multiple stations and are finally assembled, laser welding is performed. The clamping mechanism includes a cover plate positioning block (10) and two L-shaped components on the left and right sides. The device comprises a pressure head (11), two symmetrically arranged moving components on the left and right, and two symmetrically arranged roller components on the left and right. Each moving component includes an L-shaped mounting base (12), a horizontal moving unit, and a vertical moving unit. The inside of the cover plate positioning block (10) is fixedly connected to the turntable, and the outside is the cover plate placement part. The L-shaped mounting base (12) is located below the cover plate positioning block (10) and is connected to the cover plate positioning block (10) through the horizontal moving unit. The L-shaped pressure head (11) is located on the left and right sides of the cover plate positioning block (10), with its horizontal side located above the cover plate placement part of the cover plate positioning block (10) and its vertical side connected to the L-shaped mounting base (12). The roller assembly is connected via a vertical moving unit; the roller assembly is connected to the L-shaped pressure head (11) and the L-shaped mounting base (12); the roller assembly includes a horizontal roller mounting base (27), a horizontal roller (28), and a vertical roller (29). The horizontal roller mounting base (27) is fixedly connected to the lower part of the inner side of the vertical side of the L-shaped mounting base (12), and the horizontal roller (28) is connected to the horizontal roller mounting base (27); the vertical roller (29) is connected to the lower part of the vertical side of the L-shaped pressure head (11); the unlocking mechanism includes a connecting plate (40), a cylinder (41), two guide rails (42), an unlocking push plate (43), and two small push plates (44); The connecting plate (40) is fixed on the frame. The cylinder (41) and the left and right guide rails (42) are both fixed on the top of the connecting plate (40). The two guide rails (42) are located on the left and right sides of the cylinder (41). The middle part of the unlocking push plate (43) is connected to the rod part of the cylinder (41). Its left and right ends are connected to the guide rails (42) through the lower slider. The two small push plates (44) are symmetrically fixed on the top of the unlocking push plate (43). The surface of the unlocking push plate (43) opposite to the pressing mechanism is an inclined vertical roller contact surface (45). The surface of the two small push plates (44) opposite to the pressing mechanism is an inclined horizontal roller contact surface (46).

2. The integrated assembly and laser welding device according to claim 1, characterized in that: The lateral movement unit includes a lateral guide rail (13), a lateral slider (14), and two front and rear tension spring units. Each tension spring unit includes a lateral tension spring (15), a small connecting block I (16), and a small connecting block II (17). The vertical movement unit includes a vertical slider (18), a vertical guide rail (19), and two front and rear tension spring units. Each tension spring unit includes a vertical tension spring (20), a small connecting block III (21), and a small connecting block IV (22). The lateral guide rail (13) is fixed below the cover plate positioning block (10), and the lateral slider (14) is fixed above the horizontal side of the L-shaped mounting base (12). The lateral slider (14) cooperates with the lateral guide rail (13). The small connecting block I (16) is fixed below the cover plate positioning block (10). Block II (17) is fixed on the upper part of the outer side of the vertical side of the L-shaped mounting base (12). The two ends of the transverse tension spring (15) are connected to the opening slots on the small connecting block I (16) and the small connecting block II (17) respectively. The vertical slider (18) is fixed on the inner side of the vertical side of the L-shaped pressure head (11). The vertical guide rail (19) is fixed on the outer side of the vertical side of the L-shaped mounting base (12). The vertical slider (18) cooperates with the vertical guide rail (19). The small connecting block III (21) is fixed on the lower side of the horizontal side of the L-shaped pressure head (11). The small connecting block IV (22) is fixed on the middle part of the outer side of the vertical side of the L-shaped mounting base (12). The two ends of the vertical tension spring (20) are connected to the opening slots on the small connecting block III (21) and the small connecting block IV (24) respectively.

3. The integrated assembly and laser welding device according to claim 1, characterized in that: The roller assembly also includes a caster mounting base (30) and a caster (31). The caster mounting base (30) is fixedly connected to the lower part of the outer side of the vertical side of the L-shaped pressure head (11), and the caster (31) is connected to the caster mounting base (30). The lowermost part of the rotating surface of the caster (31) is lower than the lower generatrix of the rotating surface of the vertical roller (29).

4. The integrated assembly and laser welding device according to claim 1, characterized in that: The clamping mechanism also includes a pressure head copper nozzle (32), which is fixed at the lower part of the inner hole of the L-shaped pressure head (11). The pressure head copper nozzle (32) is a contour pressure head.

5. The integrated assembly and laser welding device according to claim 2, characterized in that: The moving component also includes a limiting unit, which includes a large connecting seat (23), two small connecting seats (24), two rivets (25), and two positioning bolts (26). The large connecting seat (23) is fixed below the cover plate positioning block (10) and located in the middle of the two left and right transverse guide rails (13). A rivet (25) is connected to each of the left and right end faces of the large connecting seat (23). The two small connecting seats (24) are respectively fixed below the transverse sides of the two L-shaped mounting seats (12). The positioning bolts (26) pass through the small connecting seats (24) and their end faces are opposite to the rivets (25).

6. The integrated assembly and laser welding device according to claim 1, characterized in that: It also includes a detection unit, which includes left and right stops (33), left and right mounting strips (48), and left and right sensors (49); the two stops (33) are respectively fixed on the horizontal sides of the two L-shaped mounting bases (12) and are arranged symmetrically on the left and right, the mounting strips (48) are fixed on the connecting plate (40), and the sensors (49) are fixed on the upper part of the mounting strips (48) and are arranged opposite to the stops (33) in front and behind.

7. The control method for the integrated assembly and laser welding device according to any one of claims 1-6, characterized in that: It includes the following steps: Step 1: The turntable drives the clamping mechanism to the unlocking mechanism position. Step 2: The cylinder pushes the unlocking push plate inward, the vertical roller contact surface contacts the vertical roller, pushing the left and right L-shaped pressure heads upward. When the L-shaped pressure heads stop moving upward, the horizontal roller contact surface contacts the horizontal roller, pushing both L-shaped pressure heads outward simultaneously, placing the part on the cover plate positioning block. Step 3: After the part is placed, the cylinder pushes the unlocking push plate outward, the horizontal tension spring drives the two L-shaped pressure heads inward to merge; the vertical tension spring drives the two L-shaped pressure heads downward, pressing the part on the cover plate positioning block with the inside of the horizontal edge of the L-shaped pressure head. Step 4: The turntable drives the clamping mechanism to the next unlocking mechanism position, repeating the above steps to place the next part.

8. The control method according to claim 7, characterized in that: The number of clamping and unlocking mechanisms is the same as the number of cover plate parts, ensuring that all parts are assembled when the last welding station is reached.

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