Continuous pressure welding device for battery cap

Abstract

The invention discloses a battery cap continuous pressure welding device which comprises a base, a welding module and a rotating module are arranged on the base, and a plurality of electromagnetic positioning modules are arranged on a rotating disc of the rotating module; each electromagnetic positioning module comprises a material placing unit and a positioning unit, the material placing unit is arranged on the upper surface of the rotating disc, an annular permanent magnet and a clamping unit are assembled in the material placing unit, and the annular permanent magnet is made of a high-permeability material; the positioning unit is installed on the rotating disc through a supporting frame, and an electromagnetic coil is arranged in the positioning unit. An annular permanent magnet and an electromagnetic coil in the arranged electromagnetic positioning module work cooperatively, after a lithium battery is placed on the material placing unit, the electromagnetic coil is powered on, a magnetic field generated by the electromagnetic coil and a magnetic field of the annular permanent magnet repel each other, accurate centering and clamping of the lithium battery are achieved, the positioning accuracy of a battery cap is guaranteed, and the positioning efficiency of the battery cap is improved. Welding deviation is reduced, and product quality is effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of welding equipment, specifically a continuous pressure welding device for battery caps. Background Technology

[0002] A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. It differs from rechargeable lithium-ion batteries and lithium-ion polymer batteries. With the development of microelectronics technology at the end of the 20th century, miniaturized devices have become increasingly common, placing high demands on power supplies. Lithium batteries have thus entered a stage of large-scale practical application. The cap is an important component of a lithium battery, and the pressure welding between the top and bottom caps is a crucial processing step.

[0003] Existing technology discloses a cap welding device for lithium battery production, including a base, an outer frame, and a feeding plate. The outer frame is fixed to the upper right side of the base, and the feeding plate is fixed to the upper and lower ends of the back of the outer frame. A servo motor is fixed to the bottom right side of the base. An inner cylinder is vertically fixed to the right side of the base. A hydraulic cylinder is horizontally fixed to the upper left side of the inner cylinder. A welding assembly is installed inside the outer frame. This invention can automatically weld lithium batteries without stopping the machine. During the welding process, the welded lithium battery is automatically ejected, making it easier to pick up and replace lithium batteries, effectively reducing the workload of workers, and further improving the production efficiency of lithium batteries.

[0004] However, the clamp-type fixing method in the above technology is difficult to adapt to lithium batteries of different diameters. Uneven clamping force can easily cause lithium batteries to shift, and the fixing ring is not accurately centered, resulting in misalignment between the cap and the terminal post, which can easily lead to poor soldering or misaligned soldering, making it difficult to meet the ever-increasing production demands. Summary of the Invention

[0005] The present invention mainly provides a continuous pressure welding device for battery caps to solve the technical problems mentioned in the background art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A continuous pressure welding device for battery caps includes a base, on which a welding module and a rotating module are provided, and on the rotating disk of the rotating module are provided multiple electromagnetic positioning modules. Each of the electromagnetic positioning modules includes a material placement unit and a positioning unit. The material placement unit is located on the upper surface of the rotating disk and is equipped with a ring-shaped permanent magnet and a clamping unit. The ring-shaped permanent magnet is made of a high magnetic permeability material. The positioning unit is mounted on the rotating disk via a support frame, and an electromagnetic coil is provided inside the positioning unit.

[0007] Preferably, the plurality of material placement units are circumferentially distributed on the rotating disk, the positioning unit is located directly above the material placement unit, and the number of the positioning unit is the same as that of the material placement unit. In addition, the size of the central circular hole of the positioning unit is the same as that of the material placement unit and the two are concentric.

[0008] Preferably, the clamping unit includes a gripper, which is disposed in a groove, and the contact surface between the gripper and the battery is provided with a rubber pad. The groove is a dovetail groove, and the groove is distributed in a cross shape on the upper surface of the feeding unit.

[0009] Preferably, the gripper is made of hard plastic material and has a hard metal plate inside. In addition, the rubber pad is made of high-temperature resistant, high-elasticity rubber material with a wavy cross-section, and a pressure sensor is provided at the connection between the rubber pad and the gripper.

[0010] Preferably, the rotating disk is provided with an electric telescopic rod, the electric telescopic rod is positioned one-to-one with the material placement unit, and the telescopic end of the electric telescopic rod is movably connected to the bottom of the material placement unit.

[0011] Preferably, the rotating module includes a rotating motor, the output end of which is connected to a driving gear, the driving gear meshing with a driven gear, the driven gear being mounted on a rotating shaft, one end of which is rotatably connected to the inner bottom wall of the base via a bearing seat, and the other end of which passes through the top wall of the base and is rotatably connected to the rotating disk.

[0012] Preferably, the rotating shaft is located at the center of the base, and the rotating shaft is rotatably connected to the top wall of the base via a sliding bearing.

[0013] Preferably, the welding module includes an electric lifting rod, the bottom of which is connected to the upper surface of the base, and the lifting end of the electric lifting rod is connected to a workbench. The lower surface of the workbench is provided with a welding head and a rotary encoder, and an electronic induction tag is provided on the base directly below the rotary encoder.

[0014] Preferably, the electronic sensing tags are distributed circumferentially on the upper surface of the base, and the position and number of the electronic sensing tags correspond to the electromagnetic positioning module on the base.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes the coordinated operation of a ring-shaped permanent magnet and an electromagnetic coil in the electromagnetic positioning module. When the lithium battery is placed on the feeding unit, the electromagnetic coil is energized. The magnetic field generated by the electromagnetic coil and the magnetic field of the ring-shaped permanent magnet repel each other, achieving precise centering and clamping of the lithium battery. This ensures the positioning accuracy of the battery cap, reduces welding deviation, and effectively improves product quality.

[0016] 2. The adaptive gripper in the clamping unit of this invention has a hard metal plate inside that can be equivalent to a wire model in the electromagnetic field generated by the annular permanent magnet and the energized electromagnetic coil. Under the action of Ampere force, the entire gripper moves inward to close, which can accommodate lithium batteries of different diameters and greatly improve the versatility of the equipment. The wavy rubber pad on its surface can fit tightly against the outer wall of the lithium battery, enhance the friction, and can also automatically adjust the clamping shape according to the slight differences in the shape of the lithium battery.

[0017] 3. This invention enables the welding head to accurately position the battery cap by linking the rotary encoder and the electronic induction tag, reducing the occurrence of poor welding and misaligned welding, ensuring stable operation of the equipment, and effectively improving product quality.

[0018] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the overall structure of the present invention; Figure 3 This is a top view of the overall structure of the present invention; Figure 4 This is a cross-sectional view of the electromagnetic positioning module structure of the present invention; Figure 5 This is a schematic diagram of the gripper structure of the present invention; Figure 6 This is a side sectional view of the rotating disk structure of the present invention; Figure 7 This is a cross-sectional view of the rotating module structure of the present invention.

[0020] Figure Descriptions: 1. Base; 101. Electronic sensor tag; 2. Welding module; 201. Electric lifting rod; 202. Workbench; 203. Welding head; 204. Rotary encoder; 3. Rotation module; 301. Rotary motor; 302. Drive gear; 303. Driven gear; 304. Shaft; 305. Bearing seat; 306. Rotary disk; 307. Sliding bearing; 4. Electromagnetic positioning module; 5. Material feeding unit; 501. Ring permanent magnet; 502. Electric telescopic rod; 6. Positioning unit; 601. Support frame; 602. Electromagnetic coil; 7. Clamping unit; 701. Gripper; 702. Slide groove; 703. Rubber pad; 704. Hard metal sheet; 705. Pressure sensor. Detailed Implementation

[0021] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete. Example

[0022] Please refer to the appendix carefully. Figure 1 , 2 As shown in Figures 3 and 4, a continuous pressure welding device for battery caps includes a base 1, a welding module 2 and a rotating module 3 on the base 1, and a plurality of electromagnetic positioning modules 4 on the rotating disk 306 of the rotating module 3. Each electromagnetic positioning module 4 includes a material placement unit 5 and a positioning unit 6. The material placement unit 5 is located on the upper surface of the rotating disk 306, and the material placement unit 5 is equipped with an annular permanent magnet 501 and a clamping unit 7. The annular permanent magnet 501 is made of a high magnetic permeability material. The positioning unit 6 is mounted on the rotating disk 306 through a support frame 601, and the positioning unit 6 is equipped with an electromagnetic coil 602 inside.

[0023] It should be noted that after the lithium battery is placed on the placement unit 5, the electromagnetic coil 602 is energized. At this time, the magnetic field generated by the electromagnetic coil 602 and the magnetic field of the ring permanent magnet 501 repel each other, and the superimposed area of ​​the two forms a complex and ordered composite magnetic field. In this composite magnetic field, due to the inherent repulsive property of like poles, the magnetic field lines near the edge bend outward, attempting to push each other away; while near the center, the magnetic field lines are relatively denser and tend to converge towards the center, forming a radial force pointing towards the center. The lithium battery with pressure welding, as a magnetic conductor placed in this magnetic field environment, will be affected by the magnetic force. Regardless of its initial position being slightly to the left, right, or tilted, it will feel the pull of this radial force within a few seconds, quickly moving towards the center until a force balance is reached, and it is stably positioned in the center of the placement unit 5. This provides a precise positioning basis for the subsequent precise pressure welding process, improving the accuracy and stability of the equipment clamping.

[0024] It should be noted that multiple material placement units 5 are arranged in a circular pattern on the rotating disk 306. This layout makes full use of the circumferential space of the rotating disk 306, ensuring the continuity and efficiency of the production process. The positioning unit 6 is located directly above the material placement unit 5, and the number of positioning units 6 is the same as that of the material placement units 5. Each positioning unit 6 acts like a precise "aiming device," accurately locking onto the corresponding material placement unit 5 from top to bottom. In addition, the size of the central circular hole of the positioning unit 6 is the same as that of the material placement unit 5, and the two are concentric. This ensures that during the positioning and clamping of the battery, the magnetic force and mechanical force can act perpendicularly and evenly on the battery, avoiding the deformation of the battery casing or damage to internal components due to uneven force. Moreover, the concentric design ensures that the battery is always in the ideal axial position during subsequent welding processes, improving the overall accuracy and stability of the process.

[0025] Please refer to the attached document carefully. Figure 4 , 5 As shown, the clamping unit 7 includes a gripper 701, which is disposed within a groove 702. A rubber pad 703 is provided on the contact surface between the gripper 701 and the battery. The groove 702 is a dovetail groove, and the grooves 702 are arranged in a cross shape on the upper surface of the material placement unit 5. The gripper 701 is made of hard plastic, and a hard metal sheet 704 is also provided inside the gripper 701. Furthermore, the rubber pad 703 is made of high-temperature resistant, high-elasticity rubber material, and its cross-section is wavy. A pressure sensor 705 is provided at the connection point between the rubber pad 703 and the gripper 701.

[0026] It should be noted that in the composite magnetic field formed by the electromagnetic coil 602 and the ring permanent magnet 501, the hard metal sheet 704 inside the gripper 701 can be equivalent to a wire model. Based on the basic principles of electromagnetism, according to the Ampere force formula (F=BILsinθ) (where F is the Ampere force, B is the magnetic induction intensity, I is the current, L is the wire length, and θ is the angle between the current direction and the magnetic field direction), when the current of the electromagnetic coil 602 increases, causing the magnetic field strength (B) to increase, the hard metal sheet 704 inside the gripper 701 and the surrounding magnetic micro-regions affected by the magnetic field will be subjected to a greater Ampere force, thereby causing the entire gripper 701 to close inward.

[0027] It should be noted that the pressure sensor 705 monitors the clamping force in real time and transmits the data to the control system. When the control system determines that the clamping force needs adjustment, it will change the current of the electromagnetic coil 602. If the clamping force needs to be increased, the current is increased, and the magnetic field generated by the electromagnetic coil 602 interacts more strongly with the magnetic field of the ring permanent magnet 501, resulting in a greater inward driving force on the gripper 701, further tightening it. Conversely, decreasing the current allows the gripper 701 to relax appropriately. This electromagnetic force fine-tuning mechanism based on real-time feedback becomes the continuous power source for the gripper 701 to dynamically adjust and maintain the optimal clamping state during the clamping process, ensuring that the gripper 701 can adapt to the characteristics of different lithium batteries and stably and reliably complete the clamping task until the pressure welding process ends and a release command is received.

[0028] Please refer to the attached document carefully. Figure 6 As shown, the rotating disk 306 is equipped with an electric telescopic rod 502, which corresponds one-to-one with the position of the material placement unit 5, and the telescopic end of the electric telescopic rod 502 is movably connected to the bottom of the material placement unit 5.

[0029] It should be noted that in actual production scenarios, the specifications and dimensions of battery caps are not fixed. When it is necessary to handle battery caps of different heights and sizes, the electric telescopic rod 502 can respond flexibly. Its telescopic end is movably connected to the bottom of the material placement unit 5, which can easily adjust the height of the material placement unit 5, improving the equipment's versatility and flexible production capabilities. At the same time, after the operation is completed, the electric telescopic rod 502 can discharge the battery from the material placement unit 5.

[0030] It should be noted that on the automated production line, when the production instruction switches to a new battery cap model, the control system immediately drives the corresponding electric telescopic rod 502 to quickly adjust the height of the material placement unit 5. Subsequently, the rotating module 3 and welding module 2 can seamlessly connect to subsequent processes without manual intervention, further improving the continuity of the production cycle and enhancing the automation level of continuous pressure welding of battery caps. Please refer to the attached document carefully. Figure 7 As shown, the rotating module 3 includes a rotating motor 301. The output end of the rotating motor 301 is connected to a driving gear 302. The driving gear 302 is meshed with a driven gear 303. The driven gear 303 is mounted on a rotating shaft 304. One end of the rotating shaft 304 is rotatably connected to the inner bottom wall of the base 1 through a bearing seat 305, and the other end passes through the top wall of the base 1 and is rotatably connected to a rotating disk 306. The rotating shaft 304 is located at the center of the base 1, and the rotating shaft 304 is rotatably connected to the top wall of the base 1 through a sliding bearing 307.

[0031] It should be noted that when the rotary motor 301 rotates, the drive gear 302 also rotates. The drive gear 302 meshes with the driven gear 303, causing the rotating shaft 304 to rotate, which in turn drives the rotating disk 306 to rotate. This causes the battery to be welded in the electromagnetic positioning module 4 on the rotating disk 306 to rotate to the working position of the welding module 2 for operation. Compared with belt drives and other methods, this gear transmission method has a more precise and stable transmission ratio, reducing slippage. During long-term operation, it can accurately transmit the power of the rotary motor 301 to the rotating shaft 304, driving the rotating disk 306 to rotate at a uniform speed. This allows the electromagnetic positioning module 4 and the battery cap placed on the rotating disk 306 to stably rotate to the welding position according to the preset rhythm and angle, creating ideal conditions for high-precision welding and reducing welding defects caused by speed fluctuations and angle deviations.

[0032] It should be noted that the rotating shaft 304 is located at the center of the base 1 and is rotatably connected to the inner bottom wall of the base 1 via the bearing seat 305. This connection method ensures good dynamic balance of the rotating disk 306, ensuring uniform force distribution throughout the rotating structure when the disk 306 rotates, effectively preventing vibrations caused by center of gravity shift. Furthermore, the rotating shaft 304 is rotatably connected to the top wall of the base 1 via a sliding bearing 307. The special lubrication structure and low coefficient of friction of the sliding bearing 307 reduce the frictional force experienced by the rotating shaft 304 during rotation. Compared to traditional rolling bearings, it does not require frequent grease replenishment, reducing maintenance workload. During long-term operation, low friction means lower energy consumption, saving electrical energy, and reducing the risk of component thermal deformation caused by frictional heat, maintaining stable operation of the device over long periods and ensuring continuous production.

[0033] Please refer to the attached document carefully. Figure 1 , 2 As shown in Figure 3, the welding module 2 includes an electric lifting rod 201. The bottom of the electric lifting rod 201 is connected to the upper surface of the base 1, and the lifting end of the electric lifting rod 201 is connected to a workbench 202. The lower surface of the workbench 202 is provided with a welding head 203 and a rotary encoder 204. An electronic induction tag 101 is provided on the base 1 directly below the rotary encoder 204. The electronic induction tags 101 are distributed in a circle on the upper surface of the base 1, and the position and number of the electronic induction tags 101 correspond to the electromagnetic positioning module 4 on the base 1.

[0034] It should be noted that the electric lifting rod 201 can flexibly adjust the height of the worktable 202. The welding head 203 on the lower surface of the worktable 202 can then be precisely positioned vertically, adapting to the welding needs of battery caps of different heights. Simultaneously, the circumferentially distributed electronic induction tags 101 on the base 1 correspond one-to-one with the position and number of the electromagnetic positioning modules 4, forming a precise positioning and monitoring system in conjunction with the rotary encoder 204. During the welding process, the rotary encoder 204 captures the rotation angle of the rotating disk 306 in real time, and the electronic induction tags 101 accurately report the position of the electromagnetic positioning modules 4. Together, these two components allow the welding head 203 to accurately know the position of each battery cap. Millimeter-level positioning accuracy effectively avoids welding deviations, ensuring stable and reliable product welding quality.

[0035] It should be noted that when the rotary table 306 moves the battery cap to the welding station, the electronic sensor tag 101 and the rotary encoder 204 quickly transmit the position and angle data to the control system. The control system then immediately instructs the electric lifting rod 201 to fine-tune the height of the worktable 202 and adjust the parameters of the welding head 203 according to the preset program, thereby achieving personalized welding of battery caps of different specifications. This intelligent control eliminates the need for repeated manual calibration, improves welding efficiency, reduces labor costs, and also reduces the quality risks caused by human error.

[0036] The specific operation process of this invention is as follows: First, the lithium battery to be welded cap is placed into the electromagnetic positioning module 4. Then, the electromagnetic coil 602 in the positioning unit 6 is energized. The electromagnetic coil 602 and the ring permanent magnet 501 in the material placement unit 5 form a composite magnetic field. The lithium battery quickly moves towards the center and is stably positioned in the center of the material placement unit 5. As the current is increased, the magnetic field generated by the electromagnetic coil 602 interacts more strongly with the magnetic field of the ring permanent magnet 501, which causes the gripper 701 to be subjected to a greater inward closing driving force, further tightening and stably holding the lithium battery. When the rotary motor 301 is restarted, the drive gear 302 also rotates. The drive gear 302 meshes with the driven gear 303 to rotate, thereby driving the rotating shaft 304 to rotate, which in turn drives the rotating disk 306 to rotate, causing the battery to be welded in the electromagnetic positioning module 4 on the rotating disk 306 to start rotating. When the battery to be welded in the electromagnetic positioning module 4 is transferred to the welding station, the rotary encoder 204 detects the electronic induction tag 101 and quickly transmits the position and angle data to the control system. The control system immediately instructs the electric lifting rod 201 to fine-tune the height of the worktable 202 and adjust the parameters of the welding head 203 to weld the lithium battery according to the preset program. After welding is completed, the electromagnetic positioning module 4 continues to rotate to the next position, then reduces the current in the electromagnetic coil 602 to allow the gripper 701 to relax appropriately, and starts the electric telescopic rod 502 to discharge the battery.

[0037] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A battery cap continuous pressure welding device, comprising a base (1), characterized in that: The base (1) is provided with a welding module (2) and a rotating module (3), and a rotating disk (306) of the rotating module (3) is provided with a plurality of electromagnetic positioning modules (4); Each of the electromagnetic positioning modules (4) comprises a material placement unit (5) and a positioning unit (6); the material placement unit (5) is arranged on the upper surface of the rotating disk (306), and an annular permanent magnet (501) and a clamping unit (7) are installed in the material placement unit (5); the annular permanent magnet (501) is made of a material with high magnetic permeability; The positioning unit (6) is mounted on the rotating disk (306) via a support frame (601), and an electromagnetic coil (602) is provided inside the positioning unit (6).

2. A battery cap continuous pressure welding device according to claim 1, characterized in that: The plurality of material placement units (5) are distributed in a circular pattern on the rotating disk (306); the positioning units (6) are located directly above the material placement units (5); and the number of the positioning units (6) is the same as that of the material placement units (5); furthermore, the size of the central circular hole of the positioning unit (6) is the same as that of the material placement unit (5), and the two are concentric.

3. A battery cap continuous pressure welding device according to claim 1, characterized in that: The clamping unit (7) comprises a clamping jaw (701), the clamping jaw (701) being arranged in a slide groove (702), and a rubber pad (703) being arranged on a contact surface between the clamping jaw (701) and the battery, the slide groove (702) being a dovetail groove, and the slide groove (702) being distributed in a cross shape on the upper surface of the material placement unit (5).

4. A battery cap continuous pressure welding device according to claim 3, characterized in that: The clamping jaw (701) is made of a hard plastic material, and a hard metal sheet (704) is also provided inside the clamping jaw (701). In addition, the rubber pad (703) is made of a high-elastic rubber material that is resistant to high temperatures and has a wavy cross-section, and a pressure sensor (705) is provided at the connection between the rubber pad (703) and the clamping jaw (701).

5. A battery cap continuous pressure welding device according to claim 2, characterized in that: An electric telescopic rod (502) is provided in the rotating disk (306), the electric telescopic rod (502) corresponds to the position of the material placement unit (5) one by one, and the telescopic end of the electric telescopic rod (502) is movably connected to the bottom of the material placement unit (5).

6. A battery cap continuous pressure welding device according to claim 1, characterized in that: The rotating module (3) comprises a rotating motor (301), the output end of the rotating motor (301) being transmission-connected to a driving gear (302), the driving gear (302) being meshingly transmission-connected to a driven gear (303), the driven gear (303) being arranged on a rotating shaft (304), one end of the rotating shaft (304) being rotationally connected to the inner bottom wall of the base (1) via a bearing seat (305), and the other end of the rotating shaft (304) penetrating the top wall of the base (1) and being rotationally connected to the rotating disk (306).

7. A battery cap continuous pressure welding device according to claim 6, characterized in that: The rotating shaft (304) is located at the center of the base (1), and the rotating shaft (304) is rotatably connected to the top wall of the base (1) via a sliding bearing (307).

8. A battery cap continuous pressure welding device according to claim 1, characterized in that: The welding module (2) comprises an electric lifting rod (201), the bottom of the electric lifting rod (201) is connected to the upper surface of the base (1), and the lifting end of the electric lifting rod (201) is connected to a workbench (202), the lower surface of the workbench (202) is provided with a welding head (203) and a rotary encoder (204), and the base (1) directly below the rotary encoder (204) is provided with an electronic sensing tag (101).

9. A battery cap continuous pressure welding device according to claim 8, characterized in that: The electronic induction tags (101) are distributed in a circular pattern on the upper surface of the base (1), and the positions and numbers of the electronic induction tags (101) correspond to the electromagnetic positioning modules (4) on the base (1).

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