A lithium battery welding apparatus

Abstract

The present application belongs to the technical field of lithium battery welding equipment, and discloses a lithium battery welding equipment, which comprises a mounting table, a material taking and welding mechanism and a feeding mechanism, the mounting table is provided with a conveyor, a linear module, an L-shaped frame, a cross slide and an L-shaped plate, the L-shaped plate supports the feeding mechanism through a bull's eye shaft, the L-shaped frame is provided with a camera, the feeding mechanism comprises a rotating disc, stacked pipes, a motor and a laser ranging sensor, and can realize automatic circulation feeding of the tab conductive sheet. The material taking and welding mechanism is integrated with the L-shaped frame, a spot welding machine, a suction cup, an air pump and an air filter, and is matched with the high-precision linkage of the linear module and the cross slide to complete the integrated operation of adsorption material taking, accurate attachment and spot welding, and simultaneously realizes source collection and filtration of welding fume. The equipment compensates for the deviation through visual positioning, improves the welding alignment accuracy, replaces manual operation, adapts to the automatic production line rhythm, optimizes the working environment, and improves the efficiency and quality of lithium battery welding.

Description

Technical Field

[0001] This invention relates to the field of lithium battery welding equipment technology, specifically to a lithium battery welding device. Background Technology

[0002] With the continuous increase in market penetration of new energy products such as electric vehicles and portable energy storage devices, the market has placed stringent demands on the production efficiency, connection reliability, and safety performance of lithium battery modules. Welding, as a key process connecting the tabs and conductive sheets of lithium battery modules, directly impacts the production quality and large-scale production progress of lithium battery modules. Patent CN112958988B, authorized by the State Intellectual Property Office, discloses a lithium battery welding device. This device uses a base for overall support, with a welding structure and a rotating mechanism on top of the base. The rotating mechanism automatically adjusts the angle of the lithium battery and simultaneously fixes the conductive sheets during welding, reducing manual movement during the welding process and improving the convenience of the welding operation. However, this equipment and existing similar lithium battery welding equipment still have many technical problems that need to be solved in actual industrial applications. First, the material supply still relies on manual operation to load the electrode conductive sheets, without an automated feeding mechanism. This makes it impossible to match the operating rhythm of automated production lines, and the preparation time for welding a single battery module is relatively long, making it difficult to meet the efficiency requirements of mass production. Second, the positioning method relies solely on a mechanical rotation mechanism to adjust the angle of the lithium battery, lacking a high-precision visual positioning and position compensation system. This makes it impossible to correct the slight offsets generated during the assembly of the lithium battery pack, which can easily lead to insufficient alignment accuracy between the electrode conductive sheets and the cell electrodes, resulting in quality problems such as poor welding and misaligned welding, affecting the electrical connection stability of the lithium battery module. Third, the equipment does not have a welding fume collection and filtration unit. The copper and aluminum metal fumes generated during spot welding will directly escape into the production environment. Long-term accumulation will not only cause short circuits in the internal electrical components of the equipment and affect the service life of the equipment, but also damage the respiratory system of the operators, which does not meet the occupational health and safety standards of modern production. Summary of the Invention

[0003] The purpose of this invention is to provide a lithium battery welding equipment to solve the problems mentioned in the background art, such as the reliance on manual feeding of electrode conductive sheets which cannot adapt to the production line cycle, the lack of high-precision visual positioning which easily leads to welding alignment deviation, and the lack of a smoke and dust collection unit which endangers equipment and personnel safety.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A lithium battery welding device includes: an installation platform, in which a conveyor is driven and installed, and multiple sets of installation discs are fixedly installed at equal intervals on the outer surface of the conveyor belt of the conveyor, the installation discs being used to place the assembled lithium battery packs;

[0006] Linear modules are installed on both sides of the mounting platform. A U-shaped frame is fixedly installed between the moving blocks of the two sets of linear modules. A cross slide is fixedly installed at one end of the U-shaped frame. A material picking and welding mechanism is fixedly installed at one end of the moving block of the cross slide.

[0007] An L-shaped plate is fixedly installed on the upper surface of the mounting platform. Four sets of bullseye shafts are fixedly installed on the upper surface of the L-shaped plate. A feeding mechanism is rotatably installed on the upper surface of the four sets of bullseye shafts and is also rotatably installed inside the L-shaped plate. The feeding mechanism is used to stack multiple sets of electrode conductive sheets.

[0008] In the aforementioned lithium battery welding equipment, cameras are fixedly installed on both sides of the U-shaped frame, with the monitoring end of the camera facing the lower part of the material picking and welding mechanism. The conveyor belt of the conveyor drives the mounting plate to be positioned opposite to the camera. The image signal output ends of the two sets of cameras are electrically connected to the signal receiving end of the controller, and the control output end of the controller is electrically connected to the driving end of the linear module and the driving end of the cross slide, respectively.

[0009] In the aforementioned lithium battery welding equipment, the feeding mechanism includes a turntable, which is rotatably mounted inside the L-shaped plate via a shaft fixedly installed on its lower surface, and the turntable is in contact with the upper ends of four sets of bullseye shafts; the upper surface of the turntable has six sets of pick-and-place slots equidistantly arranged, one end of the upper surface of the turntable is in sliding contact with the lower surface of the mounting plate, and the mounting plate is fixedly mounted on one end of the upper surface of the L-shaped plate;

[0010] The upper surface of the mounting plate is connected to three sets of stacking tubes, which are used to stack multiple sets of electrode conductive sheets. The three sets of stacking tubes can be perpendicular to three sets of pick-and-place slots as the turntable rotates, so that the stacked electrode conductive sheets automatically fall into the pick-and-place slots.

[0011] In the aforementioned lithium battery welding equipment, one end of the L-shaped plate extends in a U-shape and is fitted with a connecting plate, and a motor is fixedly installed inside the connecting plate; synchronous pulleys are fixedly installed on the outer surface of the output shaft of the motor and the outer surface of the shaft of the turntable that rotates through to the bottom of the L-shaped plate, and synchronous belts are fitted on the outer surfaces of the two sets of synchronous pulleys.

[0012] In the aforementioned lithium battery welding equipment, six sets of reflective plates are fixedly installed on the lower surface of the turntable. The six sets of reflective plates are respectively located below the six sets of pick-and-place slots and are perpendicular to the pick-and-place slots. Each set of reflective plates can be horizontally aligned with the laser emitting end of the laser ranging sensor as the turntable rotates. The laser ranging sensor is fixedly installed on one end of the upper surface of the L-shaped plate.

[0013] In the aforementioned lithium battery welding equipment, the signal transmitting end of the laser ranging sensor is electrically connected to the signal receiving end of the controller, the control output end of the controller is electrically connected to the electrical control end of the motor, and the controller is mounted on the mounting platform; the laser ranging sensor is model HG-C1400, and the controller is model S7-1200.

[0014] The aforementioned lithium battery welding equipment includes a material handling and welding mechanism comprising a U-shaped frame, which is fixedly installed at one end of the moving block of the cross slide; two sets of spot welding machines are fixedly installed inside the U-shaped frame, and the spot welding guns of the two sets of spot welding machines are sealed and slidably inserted into a sealed tube, and the lower surfaces of the two sets of sealed tubes are connected to a suction cup.

[0015] The suction cup slides through the sealing tube to the bottom of the U-shaped frame. The two sets of suction cups can be driven by the linkage of the linear module and the cross slide to be perpendicular to one of the pick-and-place slots on the turntable, so as to realize the adsorption and pick-up of the electrode conductive sheet in the pick-and-place slot.

[0016] In the aforementioned lithium battery welding equipment, a first pressure plate is fixedly installed on the lower surface of the U-shaped frame, and the sealing tube slides through the first pressure plate; a second pressure plate is fixedly installed at the lower end of the outer surface of the sealing tube, and a spring is fitted on the outer surface of the sealing tube. The two ends of the spring are fixedly connected to the lower surface of the first pressure plate and the upper surface of the second pressure plate, respectively, and the spring is used to apply a downward spring force to the suction cup.

[0017] When the suction cup adsorbs the conductive tab and touches the upper surface of the lithium battery pack, the U-shaped frame is subjected to the downward pressure of the cross slide. The suction cup overcomes the spring force through the second pressure plate, driving the sealing tube to slide into the U-shaped frame and along the outer surface of the spot welding gun, so that the spot welding gun protrudes from the lower end and touches the surface of the conductive tab, thereby realizing the spot welding operation of the spot welding gun on the conductive tab and the lithium battery.

[0018] In the aforementioned lithium battery welding equipment, a first air pump and a second air pump are fixedly installed at both ends of the U-shaped frame, respectively. The air ports of the first air pump and the second air pump are connected to air nozzles installed on the upper surfaces of the two sets of suction cups via air pipes. The first air pump is used to provide negative pressure suction power to the suction cups, and the second air pump is used to inject positive pressure air into the suction cups. The exhaust port of the first air pump is connected to an air filter element, which is connected to one end of the U-shaped frame.

[0019] In the aforementioned lithium battery welding equipment, the first air pump is used to adsorb the gas generated during spot welding of the electrode conductive sheet by the spot welding gun and deliver it to the air filter for filtration; during the spot welding process, the suction cup covers the welding area so that the welding gas is covered in the suction cup; both the first air pump and the second air pump are electrically connected to the controller and are controlled by the controller to start and stop.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. Automated cyclic feeding of conductive tab sheets completely replaces manual feeding. The feeding mechanism features precise linkage between the motor and laser rangefinder, achieving high-precision alignment between the pick-and-place slots and the stacking tubes. This ensures the conductive tab sheets are automatically and neatly placed. Six sets of pick-and-place slots complete the cyclic feeding as the turntable rotates. This avoids feeding deviations caused by human error and significantly shortens the pre-feeding preparation time, improving the continuity and accuracy of the feeding process and adapting to the operating rhythm of automated production lines.

[0022] 2. Improve welding alignment accuracy and reduce welding quality issues. Cameras on both sides of the U-shaped frame collect real-time information on the position of the lithium battery pack. The controller adjusts the linear module and cross slide based on the collected data to achieve high-precision positioning and position compensation of the material picking and welding mechanism. This effectively corrects minor offsets that occur during the assembly of the lithium battery pack, improving the alignment accuracy of the electrode conductive sheet and the cell electrode, reducing problems such as poor welding and misalignment, and ensuring the electrical connection stability of the lithium battery module.

[0023] 3. Achieve seamless integration of material handling and welding, improving welding efficiency and connection reliability. The U-shaped frame integrates components such as suction cups and spot welding machines, and works in conjunction with the high-precision displacement control of the linear module and cross slide to complete the integrated operation of electrode conductive sheet adsorption, precise attachment, and spot welding connection. The dual-station suction cup and spot welding machine can operate simultaneously, significantly reducing the welding time of a single lithium battery module. The cooperative structure of the spring with the first and second top pressure plates ensures tight attachment of the electrode conductive sheet to the battery cell, further reducing the probability of poor welding and improving the welding yield.

[0024] 4. Achieve source collection and filtration of welding fumes, optimizing the working environment and protecting equipment and personnel. During spot welding, a suction cup covers the welding area, and the first air pump draws in the metal fumes generated during welding and delivers them to the air filter for filtration in real time. No additional dust collection equipment is required, which not only prevents damage to internal electrical components from fumes, extending the equipment's service life, but also avoids the threat to operator health from fumes, meeting modern occupational health and safety standards. Furthermore, it saves on the purchase and maintenance costs of independent dust collection devices.

[0025] 5. Enhance equipment integration and automation levels, optimize production line layout, and reduce production input. The equipment integrates functions such as automated material feeding, high-precision visual positioning, integrated material handling and welding, and fume filtration. All components are linked by a unified controller, realizing fully automated operation of lithium battery welding from workpiece transportation to fume treatment, without much manual intervention. The integrated structural design of U-shaped and U-shaped frames reduces the equipment's footprint, improves space utilization, and allows the equipment to be better integrated into automated production lines, reducing labor and equipment input for mass production of lithium battery modules. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the cross slide and camera of the present invention;

[0028] Figure 3 This is a schematic diagram of the linear module and L-shaped plate of the present invention;

[0029] Figure 4 This is a schematic diagram of the turntable and pick-up / placement slot of the present invention;

[0030] Figure 5 This is a schematic diagram of the feeding mechanism of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the U-shaped frame and spot welding machine of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of the first and second air pumps of the present invention;

[0033] Figure 8 This is a schematic diagram of the material handling and welding mechanism of the present invention.

[0034] In the diagram: 1. Mounting platform; 101. Conveyor; 102. Linear module; 103. U-shaped frame; 104. Camera; 105. Cross slide; 106. L-shaped plate; 107. Connecting plate; 108. Bullseye shaft; 109. Mounting plate; 2. Material handling and welding mechanism; 201. U-shaped frame; 202. Spot welding machine; 203. Spot welding gun; 204. Air filter; 205. Suction cup; 206. First air pump; 207. Second air pump; 208. Spring; 209. Air nozzle; 210. Sealing tube; 211. Second top pressure plate; 212. First top pressure plate; 3. Material feeding mechanism; 301. Motor; 302. Laser rangefinder sensor; 303. Turntable; 304. Stacking tube; 305. Mounting plate; 306. Reflector; 307. Picking and placing slot; 308. Synchronous pulley. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-8 This embodiment provides a lithium battery welding device, including: a mounting platform 1, a conveyor 101 mounted inside the mounting platform 1, and multiple sets of mounting trays 109 fixedly mounted at equal intervals on the outer surface of the conveyor belt of the conveyor 101. The mounting trays 109 are used to place the assembled lithium battery packs, wherein:

[0037] Linear modules 102 are installed on both sides of the mounting platform 1. A U-shaped frame 103 is fixedly installed between the moving blocks of the two linear modules 102. A cross slide 105 is fixedly installed at one end of the U-shaped frame 103. A material picking and welding mechanism 2 is fixedly installed at one end of the moving block of the cross slide 105.

[0038] An L-shaped plate 106 is fixedly installed on the upper surface of the mounting platform 1. Four sets of bullseye shafts 108 are fixedly installed on the upper surface of the L-shaped plate 106. The feeding mechanism 3 is rotatably installed on the upper surface of the four sets of bullseye shafts 108, and the feeding mechanism 3 is also rotatably installed inside the L-shaped plate 106. The feeding mechanism 3 is used to stack multiple sets of electrode conductive sheets.

[0039] Using the above scheme, the conveyor 101 on the mounting platform 1, together with the equidistantly arranged mounting trays 109, can realize the orderly transportation and stable placement of the assembled lithium battery pack, providing continuous and regular workpiece transportation conditions for welding operations; the linear modules 102 on both sides of the mounting platform 1 can drive the U-shaped frame 103 to realize the overall position adjustment of the material picking and welding mechanism 2, and the cross slide 105 can complete the fine displacement adjustment of the material picking and welding mechanism 2. The two work together to allow the working position of the material picking and welding mechanism 2 to flexibly adapt to different position requirements for material picking and welding; the bullseye shaft 108 on the L-shaped plate 106 provides support for the rotation of the feeding mechanism 3, which can reduce the frictional resistance when the feeding mechanism 3 rotates, and ensure the smoothness and stability of the rotation process of the feeding mechanism 3. The feeding mechanism 3 can realize the centralized stacking of multiple sets of electrode conductive sheets, and store materials for the subsequent automated material picking process. All components work together to build the overall framework of automated operation of the equipment, realizing the basic layout of automated workpiece transportation, material storage, and displacement adjustment of the operating mechanism before lithium battery welding.

[0040] Specifically, in this embodiment, cameras 104 are fixedly installed on both sides of the U-shaped frame 103. The monitoring end of the camera 104 faces the lower part of the material picking and welding mechanism 2. The conveyor belt of the conveyor 101 drives the mounting plate 109 to be arranged opposite to the camera 104. The image signal output ends of the two sets of cameras 104 are electrically connected to the signal receiving end of the controller. The control output end of the controller is electrically connected to the driving end of the linear module 102 and the driving end of the cross slide 105, respectively.

[0041] The cameras 104 on both sides of the U-shaped frame 103 can collect the position and offset information of the lithium battery pack under the material picking and welding mechanism 2 in real time, and transmit the image signal to the controller. The controller precisely controls the drive of the linear module 102 and the cross slide 105 based on the signal, so as to realize the position compensation and high-precision positioning of the material picking and welding mechanism 2. It can correct the small positional offset generated during the assembly of the lithium battery pack, so that the working position of the material picking and welding mechanism 2 corresponds precisely with the position of the lithium battery pack to be welded, improve the alignment accuracy of subsequent material picking and welding links, reduce welding quality problems caused by alignment deviation, and ensure the positional accuracy of welding operations.

[0042] Specifically, in this embodiment, the feeding mechanism 3 includes a turntable 303, which is rotatably mounted inside the L-shaped plate 106 via a shaft fixedly mounted on its lower surface, and the turntable 303 is in contact with the upper ends of four sets of bullseye shafts 108; the upper surface of the turntable 303 is provided with six sets of pick-and-place slots 307 at equal intervals, one end of the upper surface of the turntable 303 is in sliding contact with the lower surface of the mounting plate 305, and the mounting plate 305 is fixedly mounted on one end of the upper surface of the L-shaped plate 106;

[0043] The upper surface of the mounting plate 305 is connected to three sets of stacking tubes 304. The stacking tubes 304 are used to stack multiple sets of electrode conductive sheets. The three sets of stacking tubes 304 can be perpendicular to three sets of pick-and-place slots 307 as the turntable 303 rotates, so that the stacked electrode conductive sheets automatically fall into the pick-and-place slots 307.

[0044] The three sets of stacking tubes 304 on the mounting plate 305 can realize the layered batch stacking of electrode conductive sheets, enabling centralized storage of materials without frequent manual replenishment. The rotation of the turntable 303 can drive the pick-and-place slots 307 on it to achieve vertical alignment with the stacking tubes 304, so that the electrode conductive sheets in the stacking tubes 304 automatically fall into the pick-and-place slots 307 to complete the loading, replacing the manual sorting and placement of electrode conductive sheets, and reducing material position deviation caused by human operation errors. The turntable 303 slides against the lower surface of the mounting plate 305 to prevent the electrode conductive sheets from shifting when being unloaded, ensuring the positional accuracy of the electrode conductive sheets falling into the pick-and-place slots 307. The six sets of pick-and-place slots 307 on the turntable 303 can realize cyclic loading and feeding as the turntable 303 rotates, allowing the feeding operation to be carried out continuously, improving the feeding efficiency, and adapting to the working rhythm of the automated production line.

[0045] Specifically, in this embodiment, a connecting plate 107 is installed at one end of the L-shaped plate 106 in a U-shape, and a motor 301 is fixedly installed inside the connecting plate 107; a synchronous pulley 308 is fixedly installed on the outer surface of the output shaft of the motor 301 and the outer surface of the shaft of the turntable 303 that rotates through to the bottom of the L-shaped plate 106, and a synchronous belt is fitted on the outer surface of the two sets of synchronous pulleys 308.

[0046] The motor 301 inside the connecting plate 107 transmits power stably to the shaft of the turntable 303 through the synchronous pulley 308 and the synchronous belt, providing continuous and stable power output for the rotation of the turntable 303 and ensuring the dynamic stability of the rotation of the turntable 303. The transmission method of the synchronous pulley 308 and the synchronous belt can realize precise rotation control of the turntable 303, reduce the speed and position deviation during the transmission process, and make the rotation positioning of the turntable 303 more accurate, thereby ensuring the alignment accuracy of the pick-and-place slot 307 and the stacking tube 304. At the same time, the transmission structure has high transmission efficiency and smooth operation, which can enable the feeding operation of the feeding mechanism 3 to be carried out continuously and stably.

[0047] Specifically, in this embodiment, six sets of reflective plates 306 are fixedly installed on the lower surface of the turntable 303. The six sets of reflective plates 306 are respectively located below the six sets of pick-up and put-down slots 307 and are perpendicular to the pick-up and put-down slots 307. Each set of reflective plates 306 can be horizontally aligned with the laser emitting end of the laser rangefinder 302 as the turntable 303 rotates. The laser rangefinder 302 is fixedly installed on one end of the upper surface of the L-shaped plate 106.

[0048] The reflector 306 on the lower surface of the turntable 303 rotates with the turntable 303 and can be horizontally aligned with the laser rangefinder 302. The laser rangefinder 302 can detect the rotation position of the turntable 303 in real time through the reflector 306, accurately capture the position information of the pick-and-place slot 307, and achieve accurate determination of the rotation position of the turntable 303. This allows the pick-and-place slot 307 to achieve high-precision alignment with the stacking tube 304, avoiding alignment deviations caused by the turntable 303 rotating too far or too far, preventing the electrode conductive sheet from falling off or shifting position, ensuring the accuracy of electrode conductive sheet feeding and loading, making the feeding position control of the feeding mechanism 3 more precise, and improving the accuracy and reliability of the feeding operation.

[0049] Specifically, in this embodiment, the signal transmitting end of the laser rangefinder 302 is electrically connected to the signal receiving end of the controller, the control output end of the controller is electrically connected to the electrical control end of the motor 301, and the controller is mounted on the mounting platform 1; the model of the laser rangefinder 302 is HG-C1400, and the model of the controller is S7-1200.

[0050] The laser rangefinder 302 transmits the detected position signal to the controller in real time. The controller then uses this signal to precisely control the start and stop of the motor 301, achieving linkage control between the motor 301 and the laser rangefinder 302. This allows for automated and precise control of the rotation and stopping of the turntable 303, eliminating the need for manual intervention in adjusting the position of the turntable 303 and improving the automation level of the feeding mechanism 3. The compatible laser rangefinder 302 and controller ensure the timeliness and accuracy of signal transmission and control command issuance, reducing signal delay and control errors. This makes the entire position detection and drive control process more stable, further improving the accuracy and automation level of the feeding operation.

[0051] Specifically, in this embodiment, the material handling and welding mechanism 2 includes a U-shaped frame 201, which is fixedly installed at one end of the moving block of the cross slide table 105; two sets of spot welding machines 202 are fixedly installed inside the U-shaped frame 201, and the spot welding guns 203 of the two sets of spot welding machines 202 are sealed and slidably inserted into the sealing tube 210, and the lower surfaces of the two sets of sealing tubes 210 are connected and installed with suction cups 205;

[0052] The suction cup 205 slides through the sealing tube 210 to the bottom of the U-shaped frame 201. The two sets of suction cups 205 can be driven by the linkage of the linear module 102 and the cross slide 105 to be perpendicular to one of the pick-and-place slots 307 on the turntable 303, so as to realize the adsorption and picking of the electrode conductive sheet in the pick-and-place slot 307.

[0053] The U-shaped frame 201 integrates the spot welding machine 202, sealing tube 210, and suction cup 205, realizing an integrated layout for material handling and welding components, reducing the equipment's footprint and improving its integration. The suction cup 205 can adsorb and pick up the conductive sheets of the electrode tabs in the pick-up and put-down slot 307, replacing manual material handling and improving the automation level of the material handling process. The linear module 102 and the cross slide 105 work together to drive the suction cup 205 to be precisely perpendicular to the pick-up and put-down slot 307, ensuring that the suction cup 205 accurately adsorbs the conductive sheets of the electrode tabs, avoiding deformation or displacement of the conductive sheets of the electrode tabs during the material handling process, and improving material handling accuracy. The matching setup of two sets of spot welding machines 202 and two sets of suction cups 205 can realize dual-station synchronous operation, improve the efficiency of material handling and welding, and adapt to the needs of mass production of lithium battery modules.

[0054] Specifically, in this embodiment, a first pressure plate 212 is fixedly installed on the lower surface of the U-shaped frame 201, and a sealing tube 210 slides through the first pressure plate 212; a second pressure plate 211 is fixedly installed at the lower end of the outer surface of the sealing tube 210, and a spring 208 is fitted on the outer surface of the sealing tube 210. The two ends of the spring 208 are fixedly connected to the lower surface of the first pressure plate 212 and the upper surface of the second pressure plate 211, respectively. The spring 208 is used to apply a downward spring force to the suction cup 205.

[0055] When the suction cup 205 adsorbs the conductive tab and touches the upper surface of the lithium battery pack, the U-shaped frame 201 is subjected to the downward pressure of the cross slide 105. The suction cup 205 overcomes the spring force of the spring 208 through the second pressure plate 211, and drives the sealing tube 210 to slide into the U-shaped frame 201 and along the outer surface of the spot welding gun 203, so that the spot welding gun 203 protrudes from the lower end and touches the surface of the conductive tab, so as to realize the spot welding operation of the spot welding gun 203 on the conductive tab and the lithium battery.

[0056] The spring 208, fitted outside the sealing tube 210, applies a downward pushing force to the suction cup 205, allowing the suction cup 205 to tightly press the conductive tab against the surface of the lithium battery pack to be welded. This ensures a tight fit between the conductive tab and the lithium battery pack, reducing the risk of poor welding due to loose fit and improving the reliability of the welded connection. When the cross slide 105 applies downward pressure to the U-shaped frame 201, the second pressure plate 211 overcomes the elastic force of the spring 208, causing the sealing tube 210 and the suction cup 205 to slide upwards. This allows the spot welding gun 203 to smoothly extend from the lower end of the sealing tube 210 and press against the conductive tab for spot welding. The elastic buffering effect of the spring 208 prevents hard contact between the spot welding gun 203 and the lithium battery pack, preventing damage to components due to hard contact and ensuring the safety of the welding operation. This structure allows for seamless connection between the attachment of the conductive tab after material handling and the spot welding action, eliminating the need for additional component adjustments and improving the continuity of the welding operation.

[0057] Specifically, in this embodiment, a first air pump 206 and a second air pump 207 are fixedly installed at both ends inside the U-shaped frame 201, respectively. The air ports of the first air pump 206 and the second air pump 207 are connected to the air nozzles 209 installed on the upper surface of the two sets of suction cups 205 through air pipes. The first air pump 206 is used to provide negative pressure suction power to the suction cups 205, and the second air pump 207 is used to inject positive pressure air into the suction cups 205. The exhaust port of the first air pump 206 is connected to the air filter element 204, which is connected to one end of the U-shaped frame 201.

[0058] The first air pump 206 inside the U-shaped frame 201 provides negative pressure suction power to the suction cup 205, ensuring the stable adsorption of the electrode conductive sheet by the suction cup 205, preventing the electrode conductive sheet from falling off during material handling and transfer, and improving the stability of the material handling and transfer process; the second air pump 207 can inject positive pressure air into the suction cup 205 to realize the rapid release of the suction cup 205 from the electrode conductive sheet, allowing the suction cup 205 to quickly separate from the electrode conductive sheet after spot welding, improving the continuity of the operation process; the exhaust port of the first air pump 206 is connected to the air filter element 204, providing a dedicated channel for the filtration of welding gas, realizing the pre-layout of welding fume collection and filtration, eliminating the need for additional fume collection connection structures, and further improving the integration of the equipment.

[0059] Specifically, in this embodiment, the first air pump 206 is used to adsorb the gas generated during spot welding of the electrode conductive sheet by the spot welding gun 203 and deliver it to the air filter element 204 for filtration; during the spot welding process, the suction cup 205 covers the welding area so that the welding gas is covered inside the suction cup 205; both the first air pump 206 and the second air pump 207 are electrically connected to the controller and are controlled by the controller to start and stop. During spot welding, the suction cup 205 covers the welding area, which can contain the metal fumes generated during welding within a designated area, thus sealing off the source of welding fumes and preventing them from escaping into the production environment. The first air pump 206 adsorbs the welding fumes within the sealed area and transports them to the air filter 204 for filtration, achieving real-time collection and purification of welding fumes. This prevents fumes from damaging the electrical components inside the equipment, extends the service life of the equipment, and prevents fumes from harming the health of operators, meeting the occupational health and safety standards of modern production. The controller provides unified control over the start and stop of the first air pump 206 and the second air pump 207, achieving automated linkage of negative pressure adsorption, positive pressure release, and fume collection. This makes the workflow of material handling, welding, and fume filtration smoother and improves the overall automation level of the equipment.

[0060] Specifically, in this embodiment, to improve the positioning accuracy of the turntable 303 in the feeding mechanism and ensure the vertical alignment of the pick-and-place slot 307 and the stacking tube 304, this invention adopts a closed-loop control strategy based on a combination of feedforward motion model and PID feedback. The controller calculates the current rotation angle based on the real-time detection of the reflector 306 position by the laser rangefinder 302, and controls the start / stop and speed of the motor 301 through the following equation to achieve precise stopping of the turntable. In each sampling cycle of the controller, the actual rotation angle of the turntable is... It can be represented as:

[0061]

[0062] The meanings of the symbols in the formula are as follows:

[0063] Real-time rotation angle (rad); Initial rotation angle (rad); Initial angular velocity (rad / s);

[0064] A: Magnitude of braking angular acceleration (rad / s²), i.e., angular acceleration during the deceleration phase (positive value);

[0065] : Proportional control coefficient (dimensionless), used to correct the current deviation;

[0066] The differential control coefficient (s) is used to suppress the rate of change of deviation and has the dimension of time.

[0067] — Rotational deviation (rad);

[0068] The target stopping angle (rad) is calculated by detecting the position of the reflector using a laser rangefinder.

[0069] This equation superimposes the open-loop motion trajectory with the closed-loop feedback correction term, describing the evolution of the turntable angle over time under feedback control. In actual control, the motor control quantity u(t) is calculated by the following formula:

[0070]

[0071] Among them, feedforward term Based on the expected trajectory (i.e., the open-loop term) The corresponding speed and acceleration settings are used to compensate for system inertia and damping.

[0072] The derivation process is as follows:

[0073] 1. Kinematic feedforward model

[0074] To ensure the turntable decelerates smoothly as it approaches the target position, a uniformly decelerated trajectory is set as the desired path:

[0075] ;

[0076] Where α>0 is the preset braking deceleration.

[0077] 2. PID feedback control

[0078] In actual operation, due to disturbances such as friction and load fluctuations, the open-loop trajectory cannot accurately reach the target. By introducing PID feedback, the control variable u(t) is:

[0079] ;

[0080] Under the small deviation approximation, the additional angular displacement generated by the control quantity is proportional to u(t), i.e. Incorporating the gain K into the coefficients yields the feedback correction term:

[0081]

[0082] Since the integral term has a relatively small role in rapid localization (and can be compensated for by the system's steady-state error elimination capability), it can be temporarily ignored to simplify the model. Therefore, the feedback correction term is simplified as follows:

[0083]

[0084] Here , This is the equivalent position correction coefficient, and It has a time dimension (seconds) to ensure consistency of dimensions.

[0085] 3. Composition Equation

[0086] Superimposing the open-loop trajectory with the feedback correction term yields the final turning angle expression:

[0087]

[0088] Example: Suppose the system parameters are as follows under a certain operating condition:

[0089] =0 rad; =2 rad / s; α = 0.5 rad / s 2 ; =0.8 (dimensionless); =0.2s;

[0090] Target stop angle =3.14 rad (corresponding to one pick-up / drop-off slot position).

[0091] controller each The laser rangefinder sensor signal is sampled every 10ms. At a given sampling moment, the current rotation angle is measured. =1.5rad, current angular velocity =1.2 rad / s (can be estimated using differential or sensor methods). Then the deviation... =3.14−1.5=1.64 rad, rate of change of deviation / =− =−1.2 rad / s. Substituting this into the control formula yields the feedback part:

[0092] ;

[0093] The feedforward term is calculated based on the current velocity and acceleration of the desired trajectory (e.g., The specific value depends on the motor model, and the final control quantity is used to drive the motor to decelerate. Through repeated sampling and correction, when the absolute value of the deviation is less than the set threshold (such as 0.01 rad), the controller stops the motor and maintains a small torque to complete the positioning.

[0094] In practical applications, , The system response can be determined through simulation or on-site debugging, ensuring fast response and no overshoot.

[0095] Technical effect

[0096] 1. High-precision stop: Through the combination of feedforward deceleration and feedback correction, the vertical alignment accuracy of the pick-up slot and stacked tube can reach ≤±0.1mm.

[0097] 2. Strong anti-disturbance capability: The PID feedback term compensates for disturbances such as load changes and uneven friction in real time to ensure stable positioning.

[0098] 3. Fast response: The feedforward term provides the expected motion trajectory, and the feedback term eliminates residual deviations, reducing the stop time by about 30% compared to pure PID control.

[0099] 4. System stability: Avoids overshoot or oscillation, improving the reliability of the feeding system.

[0100] Working principle and process:

[0101] 1. Signal Acquisition: Laser rangefinder sensor 302 detects the position of reflector 306 and calculates the current rotation angle. And estimate the current angular velocity. .

[0102] 2. Deviation Calculation: The controller calculates the deviation. and deviation differential .

[0103] 3. Control output: According to the formula Calculate the motor control quantities, including the feedforward term. It is determined by the desired trajectory (the velocity and acceleration corresponding to the open-loop term) and the system model.

[0104] 4. Real-time correction: During the turntable braking process, the control quantity is continuously sampled and updated until |e(t)| < the set threshold (e.g., 0.01 rad).

[0105] 5. Stop lock: After stopping, the motor maintains a slight torque to prevent the turntable from drifting.

[0106] Through the aforementioned closed-loop control, the feeding mechanism achieves precise, rapid, and reliable turntable positioning, laying the foundation for subsequent material handling and welding processes.

[0107] In summary, the overall working principle of this invention is as follows:

[0108] This lithium battery welding equipment uses a controller to uniformly regulate the operation of all components, achieving automated lithium battery welding through four key aspects: automated material feeding, high-precision positioning, integrated material handling and welding, and fume filtration.

[0109] 1. The feeding mechanism 3 outputs power through the motor 301, which drives the turntable 303 to rotate smoothly on the bullseye shaft 108 via the synchronous pulley 308 and synchronous belt. The reflector 306 on the lower surface of the turntable 303 rotates synchronously with the turntable 303. When the reflector 306 is horizontally aligned with the laser emitting end of the laser rangefinder 302, the laser rangefinder 302 transmits the position signal to the controller. The controller precisely controls the motor 301 to stop rotating, so that the pick-and-place slot 307 on the turntable 303 is perpendicularly aligned with the stacking tube 304 on the mounting plate 305. The electrode conductive sheet in the stacking tube 304 automatically falls into the pick-and-place slot 307 to complete the loading. The motor 301 can be restarted to drive the turntable 303 to rotate to achieve cyclic feeding. The bullseye shaft 108 provides support for the rotation of the turntable 303 and reduces rotational friction resistance.

[0110] 2. After the conveyor 101 transports the mounting plate 109 containing the lithium battery pack to the work station, the cameras 104 on both sides of the U-shaped frame 103 collect the position and offset information of the lithium battery pack and transmit the image signal to the controller. The controller sends drive commands to the linear module 102 and the cross slide 105 according to the signal. The linear module 102 drives the U-shaped frame 103 to complete the overall coarse adjustment of the position of the material picking and welding mechanism 2, and the cross slide 105 completes the fine adjustment of the XY axis of the material picking and welding mechanism 2, so as to realize the high-precision positioning and position compensation of the material picking and welding mechanism 2.

[0111] 3. The U-shaped frame 201 of the material handling and welding mechanism 2 moves to the material handling position of the feeding mechanism 3 under the linkage of the linear module 102 and the cross slide 105. The cross slide 105 drives the U-shaped frame 201 to move downward, so that the suction cup 205 contacts the electrode conductive sheet in the pick-up and drop slot 307. The controller starts the first air pump 206 to provide negative pressure suction power to the suction cup 205, realizing the adsorption and picking up of the electrode conductive sheet; then the linear module 102 and the cross slide 105 will adsorb the conductive sheet. The suction cup 205 with the conductive sheet is moved above the lithium battery pack. The spring 208 applies a downward pushing force to the suction cup 205, so that the conductive sheet is tightly pressed against the surface of the lithium battery pack. The cross slide 105 continues to apply downward pressure to the U-shaped frame 201. The second pressure plate 211 overcomes the pushing force of the spring 208 and drives the sealing tube 210 to slide upward, so that the spot welding gun 203 protrudes from the lower end of the sealing tube 210 and touches the conductive sheet. The controller starts the spot welding machine 202 to complete the spot welding operation.

[0112] 4. During spot welding, the suction cup 205 covers the welding area, so that the metal fumes generated during welding are contained in the designated area. The first air pump 206 simultaneously adsorbs the fumes and delivers them to the air filter element 204 through the air pipe for filtration. After spot welding is completed, the controller starts the second air pump 207 to inject positive pressure air into the suction cup 205, releases the suction cup 205 from the conductive sheet, and completes the fume treatment and material handling mechanism reset for a single welding operation.

[0113] How to use:

[0114] 1. Initial material placement: Multiple sets of electrode conductive sheets are stacked in layers and placed into the three stacking tubes 304 on the mounting plate 305 to complete the storage of welding materials; the assembled lithium battery packs are placed one by one into the mounting trays 109 on the outer surface of the conveyor belt of the conveyor 101 to ensure that the lithium battery packs are placed stably in the mounting trays 109.

[0115] 2. Equipment start-up and workpiece conveying: Start the equipment controller, the controller starts the conveyor 101, the conveyor 101 drives the mounting plate 109 containing the lithium battery pack to be conveyed in an orderly manner. When the lithium battery pack is conveyed to the working position below the material picking and welding mechanism 2, the controller controls the conveyor 101 to stop running.

[0116] 3. Visual positioning detection: After the conveyor 101 stops, the cameras 104 on both sides of the U-shaped frame 103 automatically collect the position and offset information of the lithium battery pack tabs on the work station, and transmit the collected image signals to the controller in real time, so that the controller can complete the analysis and processing of the position data.

[0117] 4. Feeding Mechanism Operation: The controller synchronously starts the motor 301 of the feeding mechanism 3 according to the visual positioning data. The motor 301 drives the turntable 303 to rotate on the upper end of the bullseye shaft 108 through the synchronous pulley 308 and the synchronous belt. When the reflector 306 on the lower surface of the turntable 303 rotates to be horizontally opposite to the laser rangefinder 302, the laser rangefinder 302 transmits the position signal to the controller. The controller precisely controls the motor 301 to stop rotating, so that the pick-and-place slot 307 is perpendicular to the stacking tube 304. The electrode conductive sheet in the stacking tube 304 automatically falls into the pick-and-place slot 307. Then the controller starts the motor 301 again, driving the turntable 303 to rotate, and moves the pick-and-place slot 307 containing the electrode conductive sheet to the pick-and-place station of the pick-and-place welding mechanism 2.

[0118] 5. Electrode Conductive Sheet Picking: Based on the visual positioning analysis results, the controller sends drive commands to the linear module 102 and the cross slide 105. The linear module 102 drives the U-shaped frame 103 to move as a whole, and the cross slide 105 drives the U-shaped frame 201 to move precisely above the picking station, so that the suction cup 205 is perpendicular to the picking slot 307. The cross slide 105 drives the U-shaped frame 201 to move down, so that the suction cup 205 touches the surface of the electrode conductive sheet. The controller starts the first air pump 206 to provide negative pressure suction power for the suction cup 205, realizing the adsorption and picking of the electrode conductive sheet.

[0119] 6. Conductive sheet transfer and attachment: After the conductive sheet of the electrode tab is attracted, the cross slide 105 first drives the U-shaped frame 201 to move upward. Then, the linear module 102 and the cross slide 105 work together to move the suction cup 205 with the conductive sheet of the electrode tab to the top of the lithium battery pack electrode tab. The cross slide 105 drives the U-shaped frame 201 to move downward. Under the spring force of the spring 208, the suction cup 205 drives the conductive sheet of the electrode tab to make tight contact with the surface of the lithium battery pack to be welded.

[0120] 7. Spot welding operation: After the conductive sheet is attached, the cross slide 105 continues to apply downward pressure to the U-shaped frame 201. The second pressure plate 211 on the outer surface of the sealing tube 210 overcomes the spring force of the spring 208 and drives the sealing tube 210 and the suction cup 205 to slide upward along the first pressure plate 212. The spot welding gun 203 extends from the lower end of the sealing tube 210 and touches the surface of the electrode conductive sheet. The controller then starts the spot welding machine 202, and the spot welding gun 203 completes the spot welding operation between the electrode conductive sheet and the lithium battery.

[0121] 8. Welding fume filtration: While spot welding is being performed, suction cup 205 covers the welding area, and the first air pump 206 draws in the metal fumes generated during welding through air nozzle 209. The fumes are then transported through an air pipe to the air filter element 204 at one end of the U-shaped frame 201, where the air filter element 204 completes the filtration and purification of the fumes.

[0122] 9. Operation Reset and Cycle: After spot welding is completed, the controller starts the second air pump 207 to inject positive pressure air into the suction cup 205, releasing the suction cup 205 from adhering to the electrode conductive sheet. At the same time, the first air pump 206 stops sucking air. The controller starts the conveyor 101 again to transport the welded lithium battery pack to the next process, and at the same time transports the next set of lithium battery packs to be welded to the work station. The equipment enters the next round of welding operation cycle.

[0123] Overall technical effect:

[0124] 1. Automated cyclic feeding of conductive tab sheets is achieved, completely replacing manual feeding. In the feeding mechanism 3, the motor 301 and the laser rangefinder 302 are precisely linked to achieve high-precision alignment between the pick-and-place slots 307 and the stacking tubes 304, ensuring that the conductive tab sheets are automatically and neatly dropped. The six sets of pick-and-place slots 307 rotate with the turntable 303 to complete the cyclic feeding, which not only avoids feeding deviations caused by human operation errors, but also greatly shortens the pre-feeding preparation time, improving the continuity and accuracy of the feeding process, and adapting to the operating rhythm of automated production lines.

[0125] 2. Improve welding alignment accuracy and reduce welding quality issues. Cameras 104 on both sides of the U-shaped frame 103 realize real-time acquisition of lithium battery pack position information. The controller adjusts the linear module 102 and the cross slide 105 according to the acquired data to complete the high-precision positioning and position compensation of the material picking and welding mechanism 2. This effectively corrects the slight offsets generated during the assembly of the lithium battery pack, improves the alignment accuracy of the electrode conductive sheet and the cell electrode, reduces the occurrence of problems such as poor welding and misaligned welding, and ensures the electrical connection stability of the lithium battery module.

[0126] 3. Achieve seamless integration of material handling and welding, improving welding efficiency and connection reliability. The U-shaped frame 201 integrates components such as the suction cup 205 and spot welding machine 202. With the high-precision displacement control of the linear module 102 and the cross slide 105, it completes the integrated operation of adsorption, precise attachment, and spot welding of the electrode conductive sheet. The dual-station suction cup 205 and spot welding machine 202 can operate simultaneously, significantly reducing the welding time of a single lithium battery module. The cooperative structure of the spring 208 with the first top pressure plate 212 and the second top pressure plate 211 ensures tight attachment between the electrode conductive sheet and the battery cell, further reducing the probability of poor welding and improving the welding yield.

[0127] 4. Achieve source collection and filtration of welding fumes, optimizing the working environment and protecting equipment and personnel. During spot welding, suction cup 205 covers the welding area, and the first air pump 206 draws in the metal fumes generated during welding and delivers them to air filter 204 for filtration in real time. No additional dust removal equipment is required, which not only prevents damage to internal electrical components from fumes, extending the equipment's service life, but also avoids the threat to operator health from fumes, meeting modern occupational health and safety standards, while saving on the purchase and maintenance costs of independent dust removal devices.

[0128] 5. Enhance equipment integration and automation levels, optimize production line layout, and reduce production input. The equipment integrates functions such as automated material feeding, high-precision visual positioning, integrated material handling and welding, and fume filtration. All components are linked by a unified controller, realizing fully automated operation of lithium battery welding from workpiece transportation to fume treatment, without much manual intervention. The integrated structural design of U-shaped frame 201 and U-shaped frame 103 reduces the equipment's footprint, improves space utilization, and allows the equipment to be better integrated into the automated production line, reducing the labor and equipment input for mass production of lithium battery modules.

[0129] All parts not described in this invention are the same as or can be implemented using existing technology. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery welding device, characterized in that, include: Mounting platform (1), in which a conveyor (101) is installed, and multiple sets of mounting discs (109) are fixedly installed on the outer surface of the conveyor belt of the conveyor (101) in an equidistant manner. The mounting discs (109) are used to place the assembled lithium battery pack. Linear modules (102) are installed on both sides of the mounting platform (1). A U-shaped frame (103) is fixedly installed between the moving blocks of the two sets of linear modules (102). A cross slide (105) is fixedly installed at one end of the U-shaped frame (103). A material picking and welding mechanism (2) is fixedly installed at one end of the moving block of the cross slide (105). An L-shaped plate (106) is fixedly installed on the upper surface of the mounting platform (1). Four sets of bullseye shafts (108) are fixedly installed on the upper surface of the L-shaped plate (106). The feeding mechanism (3) is rotatably installed on the upper surface of the four sets of bullseye shafts (108), and the feeding mechanism (3) is also rotatably installed inside the L-shaped plate (106). The feeding mechanism (3) is used to stack multiple sets of electrode conductive sheets.

2. The lithium battery welding equipment according to claim 1, characterized in that, Cameras (104) are fixedly installed on both sides of the U-shaped frame (103). The monitoring end of the camera (104) faces the lower part of the material picking and welding mechanism (2). The conveyor belt of the conveyor (101) drives the mounting plate (109) to be set opposite to the camera (104). The image signal output ends of the two sets of cameras (104) are electrically connected to the signal receiving end of the controller. The control output end of the controller is electrically connected to the driving end of the linear module (102) and the driving end of the cross slide (105).

3. The lithium battery welding equipment according to claim 1, characterized in that, The feeding mechanism (3) includes a turntable (303), which is rotatably mounted in the L-shaped plate (106) via a shaft fixedly mounted on its lower surface, and the turntable (303) is in contact with the upper ends of four sets of bullseye shafts (108); the upper surface of the turntable (303) is provided with six sets of pick-and-place slots (307) at equal intervals, and one end of the upper surface of the turntable (303) is in sliding contact with the lower surface of the mounting plate (305), and the mounting plate (305) is fixedly mounted on one end of the upper surface of the L-shaped plate (106); The upper surface of the mounting plate (305) is connected to three sets of stacking tubes (304). The stacking tubes (304) are used to stack multiple sets of electrode conductive sheets. The three sets of stacking tubes (304) can be perpendicular to three sets of pick-and-place slots (307) as the turntable (303) rotates, so that the stacked electrode conductive sheets automatically fall into the pick-and-place slots (307).

4. The lithium battery welding equipment according to claim 3, characterized in that, One end of the L-shaped plate (106) extends in a U-shape and is fitted with a connecting plate (107). A motor (301) is fixedly installed inside the connecting plate (107). Synchronous pulleys (308) are fixedly installed on the outer surface of the output shaft of the motor (301) and the outer surface of the shaft of the turntable (303) that rotates through the L-shaped plate (106). Synchronous belts are fitted on the outer surfaces of the two sets of synchronous pulleys (308).

5. The lithium battery welding equipment according to claim 4, characterized in that, The lower surface of the turntable (303) is fixedly equipped with six sets of reflective plates (306). The six sets of reflective plates (306) are respectively located below the six sets of pick-up and put-down slots (307) and are perpendicular to the pick-up and put-down slots (307). Each set of reflective plates (306) can be horizontally aligned with the laser emitting end of the laser rangefinder (302) as the turntable (303) rotates. The laser rangefinder (302) is fixedly installed on one end of the upper surface of the L-shaped plate (106).

6. The lithium battery welding equipment according to claim 5, characterized in that, The signal transmitting end of the laser ranging sensor (302) is electrically connected to the signal receiving end of the controller, the control output end of the controller is electrically connected to the electrical control end of the motor (301), and the controller is installed on the mounting platform (1).

7. The lithium battery welding equipment according to claim 1, characterized in that, The material handling and welding mechanism (2) includes a U-shaped frame (201), which is fixedly installed at one end of the moving block of the cross slide (105); two sets of spot welding machines (202) are fixedly installed inside the U-shaped frame (201), and the spot welding guns (203) of the two sets of spot welding machines (202) are sealed and slidably inserted into the sealing tube (210), and the lower surfaces of the two sets of sealing tubes (210) are connected to the suction cups (205). The suction cup (205) slides through the sealing tube (210) to the bottom of the U-shaped frame (201). The two sets of suction cups (205) can be driven by the linkage of the linear module (102) and the cross slide (105) to be perpendicular to one of the pick-and-place slots (307) on the turntable (303) so as to realize the adsorption and picking of the electrode conductive sheet in the pick-and-place slot (307).

8. The lithium battery welding equipment according to claim 7, characterized in that, A first pressure plate (212) is fixedly installed on the lower surface of the U-shaped frame (201), and the sealing tube (210) slides through the first pressure plate (212); a second pressure plate (211) is fixedly installed on the lower end of the outer surface of the sealing tube (210), and a spring (208) is fitted on the outer surface of the sealing tube (210). The two ends of the spring (208) are fixedly connected to the lower surface of the first pressure plate (212) and the upper surface of the second pressure plate (211), respectively. The spring (208) is used to apply a downward spring force to the suction cup (205). When the suction cup (205) adsorbs the electrode conductive sheet and touches the upper surface of the lithium battery pack, the U-shaped frame (201) is subjected to the downward pressure of the cross slide (105). The suction cup (205) overcomes the spring force of the spring (208) through the second top pressure plate (211), and drives the sealing tube (210) to slide into the U-shaped frame (201) and along the outer surface of the spot welding gun (203), so that the spot welding gun (203) protrudes from the lower end and touches the surface of the electrode conductive sheet, so as to realize the spot welding operation of the spot welding gun (203) on the electrode conductive sheet and the lithium battery.

9. The lithium battery welding equipment according to claim 8, characterized in that, A first air pump (206) and a second air pump (207) are fixedly installed at both ends of the U-shaped frame (201); the air ports of the first air pump (206) and the second air pump (207) are connected to the air nozzles (209) installed on the upper surface of the two sets of suction cups (205) through air pipes. The first air pump (206) is used to provide negative pressure suction power to the suction cup (205), and the second air pump (207) is used to inject positive pressure air into the suction cup (205). The exhaust port of the first air pump (206) is connected to the air filter (204), and the air filter (204) is connected to one end of the U-shaped frame (201).

10. The lithium battery welding equipment according to claim 9, characterized in that, The first air pump (206) is used to adsorb the gas generated by spot welding and deliver it to the air filter (204) for filtration when the spot welding gun (203) performs spot welding on the electrode conductive sheet; during the spot welding process, the suction cup (205) covers the welding area so that the welding gas is covered in the suction cup (205); the first air pump (206) and the second air pump (207) are both electrically connected to the controller and are controlled by the controller to start and stop.

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