An energy storage battery tab anti-false welding precise connecting device and a use method thereof

Abstract

The application discloses a kind of energy storage battery tab false welding prevention precision connecting device and its use method, belong to battery manufacturing technical field.Device includes conveying device and central control system, and pretreatment unit, positioning unit, welding unit and detection unit are sequentially arranged along the direction of conveyance, each unit is electrically connected with central control system.Pretreatment unit includes plasma cleaning mechanism, flattening mechanism and inert gas protection mechanism;Positioning unit includes visual positioning assembly, laser displacement sensor and adsorption assembly;Welding unit includes XYZ three-axis combination slide, laser welding head, temperature sensor and welding parameter library;Detection unit includes weld detection assembly, resistance detection assembly and tension detection assembly.The application realizes the precise butt joint of tab by whole-process closed-loop design, significantly improves tab connection reliability and battery finished product qualification rate.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a method and apparatus for precise connection of energy storage battery tabs to prevent poor soldering. Background Technology

[0002] The tab connection is a core process in energy storage battery assembly, and its quality directly determines the battery's current conduction efficiency, cycle life, and safety performance. Current tab connections mostly employ laser welding, ultrasonic welding, or resistance welding; however, in actual production, incomplete welds are frequent, becoming a key bottleneck restricting the yield of finished batteries. Existing technologies have the following drawbacks: 1. Insufficient electrode tab docking accuracy: The electrode tabs are thin and narrow. Traditional positioning methods are easily affected by electrode tension fluctuations and mechanical vibrations. The docking misalignment error is generally greater than ±0.3mm, resulting in insufficient effective contact area of ​​the weld and forming a cold weld. 2. Incomplete surface pretreatment can easily lead to oxidation of the electrode surface, forming oxide layers such as aluminum oxide and copper oxide. At the same time, residual oil, dust and other impurities can form oxide inclusions during welding, which can damage the metallurgical bond of the weld. 3. Poor adaptability of welding parameters: The existing welding adopts a fixed parameter mode, which does not take into account individual differences such as electrode thickness tolerance and surface oxidation degree, resulting in insufficient or excessive welding energy for some workpieces and a high rate of false welds.

[0003] Therefore, a precise connection device for preventing poor soldering of energy storage battery tabs and its usage method are proposed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a precise connection device for preventing false welding of energy storage battery tabs and its usage method, so as to achieve precise tab connection, removal of surface oxide layer, and effective prevention of false welding, thereby significantly improving the reliability of tab connection and the qualification rate of finished battery products.

[0005] The present invention is implemented as follows: a precise connection device for preventing false soldering of energy storage battery tabs, comprising a conveying device and a central control system, wherein a pre-processing unit, a positioning unit, a welding unit and a detection unit are sequentially arranged along the conveying direction of the conveying device, and the pre-processing unit, the positioning unit, the welding unit and the detection unit are all electrically connected to the central control system. The pretreatment unit includes a plasma cleaning mechanism, a flattening mechanism, and an inert gas protection mechanism; The positioning unit includes a visual positioning component, a lifting component, a laser displacement sensor, and an adsorption component; The welding unit includes an XYZ three-axis combined slide, a laser welding head, a temperature sensor, and a welding parameter library stored in the central control system. The detection unit includes a weld detection component and a resistance detection component.

[0006] A further technical solution of the present invention is: the plasma cleaning mechanism includes a mounting frame, a plasma spray gun disposed on the mounting frame, and a fine-tuning component for adjusting the position of the plasma spray gun.

[0007] A further technical solution of the present invention is: the flattening mechanism includes a support, a first motor and two pressure rollers distributed vertically; the inert gas protection mechanism is a nitrogen protective cover covering the pretreatment area and the positioning area.

[0008] A further technical solution of the present invention is: the fine-tuning component includes a slide rail assembly, a mounting base slidably connected to the slide rail assembly, a telescopic rod disposed on the mounting base, and a fixing clamp fixedly connected to the movable end of the telescopic rod. The fixing clamp is provided with connecting ears on both sides, and the plasma spray gun is clamped between two oppositely disposed fixing clamps, and adjacent connecting ears are fixed by fixing bolts. The fine-tuning component also includes a connecting plate disposed on the slide rail assembly. The connecting plate is provided with an adjusting rod, one end of which is rotatably connected to the connecting plate, and the other end of which passes through the mounting bracket and is threadedly connected to the mounting bracket.

[0009] A further technical solution of the present invention is: the visual positioning component includes a rotating base, a rotating bracket fixed on the rotating base, a second motor disposed at the top of the rotating bracket, a threaded rod connected to the output end of the second motor, a slider threadedly engaged with the threaded rod and slidably connected to the rotating bracket, and a binocular camera rotatably connected to the slider, wherein the slider is provided with an adjustment knob for adjusting the angle of the binocular camera.

[0010] A further technical solution of the present invention is: the lifting assembly includes a connecting frame disposed inside the conveying device, a limiting rod slidably connected to the connecting frame, and a lifting cylinder disposed directly below the connecting frame, wherein the output end of the lifting cylinder is fixedly connected to the bottom surface of the connecting frame.

[0011] A further technical solution of the present invention is: the adsorption assembly includes a base, an adsorption cavity disposed at the top of the base, a plurality of adsorption holes opened on the upper surface of the adsorption cavity, and an air pump communicating with the adsorption cavity; the laser welding head is located directly above the adsorption cavity, and the temperature measuring end of the temperature sensor faces the adsorption cavity.

[0012] A further technical solution of the present invention is: the weld inspection assembly includes an inspection bracket, a sliding platform slidably connected to the top of the inspection bracket, and an industrial camera fixed to the lower surface of the sliding platform, wherein the industrial camera is located above the conveying device.

[0013] A further technical solution of the present invention is: the resistance detection component includes a micro-ohmmeter, a lifting plate, detection heads disposed at both ends of the lifting plate, wiring terminals corresponding to the detection heads, and a cylinder for driving the lifting plate, wherein the wiring terminals are electrically connected to the micro-ohmmeter through wires.

[0014] A method for using a precision connection device for preventing poor soldering of energy storage battery tabs includes the following steps: S1. Pre-treatment: The electrode tabs enter the pre-treatment unit via a conveying device, where the surface oxide layer is removed by a plasma cleaning mechanism, the electrode tabs are flattened by a flattening mechanism, and an inert gas protection mechanism is used to prevent secondary oxidation. S2, Positioning: The pre-processed electrode tabs enter the positioning unit. The visual positioning component and the laser displacement sensor collect the three-dimensional position information of the electrode tabs. The central control system controls the precision positioning platform to adjust the position of the electrode tabs so that the docking deviation is ≤±0.1mm. The adsorption component fixes the electrode tabs. S3, Welding: The central control system calls up the corresponding welding parameters from the welding parameter library according to the electrode thickness and material, controls the laser welding head to perform segmented welding, and at the same time the temperature sensor monitors the weld temperature in real time and feeds it back to the central control system to dynamically adjust the welding power. S4. Inspection: After welding is completed, the inspection unit performs visual inspection, contact resistance measurement and tensile test on the weld, and uploads the inspection data to the central control system. S5. Closed-loop feedback: The central control system analyzes the detection data. If the weld is qualified, it proceeds to the next process; if it is unqualified, it identifies the defect type, generates a repair welding instruction, and returns to step S3 for repair welding; if the re-inspection after repair welding is still unqualified, it is marked as scrap.

[0015] The beneficial effects of this invention are: 1. This invention utilizes a composite pretreatment mechanism to perform plasma cleaning and mechanical leveling on the tab surface, thoroughly removing the oxide layer and impurities, and employs inert gas protection to prevent secondary oxidation. Combined with a high-precision positioning unit using binocular vision and a laser displacement sensor, precise docking of the tab and busbar is achieved. An adaptive welding unit dynamically adjusts welding parameters based on the tab material and thickness, ensuring full weld fusion and preventing heat damage. Through this closed-loop design, the various factors contributing to incomplete welding are eliminated at their source, resulting in a significant breakthrough in tab welding quality.

[0016] 2. This invention employs a segmented welding strategy combined with real-time infrared temperature feedback to effectively control the width of the heat-affected zone, preventing thermal deformation and embrittlement of the electrode tabs. The weld seam undergoes triple verification through online visual inspection, contact resistance measurement, and micro-tensile force testing to ensure high weld joint strength, excellent conductivity, and strong fatigue resistance. The resulting reliable connection enables the battery to maintain stable current conduction efficiency during long-term charge-discharge cycles, significantly improving the operational safety, cycle stability, and service life of the energy storage battery.

[0017] 3. This invention integrates pre-processing, positioning, welding, and inspection functions into one unit. A central control system coordinates the collaborative work of each unit, enabling automated continuous production of electrode connections. Real-time detection and a closed-loop feedback mechanism can identify defects online and promptly repair them, avoiding rework delays and material waste caused by traditional offline inspection. The device is compatible with different electrode specifications, has an expandable parameter library, and adapts to the production needs of various energy storage battery models. While ensuring high-quality connections, it significantly shortens production cycle time, reduces manual intervention and material loss, making it suitable for large-scale application. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a schematic diagram of the positioning unit in this invention; Figure 3 This is a schematic diagram of the installation of the positioning unit and the welding unit in this invention; Figure 4 This is a schematic diagram of the positioning unit in this invention; Figure 5 This is a partially enlarged schematic diagram of point A in this invention; Figure 6 This is a schematic diagram of the detection unit in this invention.

[0019] Figure label: 1. Preprocessing unit; 11. Fine-tuning component; 111. Slide rail assembly; 112. Mounting base; 113. Telescopic rod; 114. Fixing clip; 115. Connecting lug; 116. Fixing bolt; 12. Plasma spray gun; 13. Mounting bracket; 14. Flattening assembly; 141. Support; 142. First motor; 143. Pressure roller; 144. Gear; 2. Positioning unit; 21. Vision positioning component; 211. Rotating base; 212. Rotating bracket; 213. Slider; 214. Second motor; 215. Binocular camera; 216. Adjustment knob; 217. Threaded rod; 22. Lifting assembly; 221. Connecting frame; 222. Limiting rod; 223. Lifting cylinder; 23. Adsorption assembly; 231. Adsorption chamber; 232. Adsorption hole; 233. Base; 234. Air pump; 24. Laser displacement sensor; 3. Welding unit; 31. XYZ three-axis combined slide table; 32. Laser welding head; 33. Temperature sensor; 4. Detection unit; 41. Weld inspection assembly; 411. Inspection bracket; 412. Sliding platform; 413. Industrial camera; 42. Resistance detection assembly; 421. Micro-ohmmeter; 422. Lifting plate; 423. Detection head; 424. Cylinder; 425. Terminal block; 5. Conveying device. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0021] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. Example 1

[0022] like Figure 1As shown, this embodiment provides a precise connection device for preventing poor soldering of energy storage battery tabs, including a conveying device 5 and a central control system (not shown in the figure). A pre-processing unit 1, a positioning unit 2, a welding unit 3, and a detection unit 4 are sequentially arranged along the conveying direction of the conveying device 5. The pre-processing unit 1, positioning unit 2, welding unit 3, and detection unit 4 are all electrically connected to the central control system via signal lines to achieve data interaction and collaborative control.

[0023] like Figure 2 As shown, the pretreatment unit 1 includes a mounting bracket 13, a plasma spray gun 12 disposed at the top of the mounting bracket 13, a fine-tuning component 11 for adjusting the position of the plasma spray gun 12, and a flattening component 14.

[0024] Preferably, the plasma spray gun 12 is arranged at a 90° right angle to the electrode conveying path to ensure that the plasma beam effectively impacts the electrode connection surface.

[0025] like Figure 5 As shown, the fine-tuning component 11 includes a slide rail assembly 111 disposed at the top of the mounting bracket 13 and a mounting base 112 slidably connected to the slide rail assembly 111. The mounting base 112 is provided with a telescopic rod 113. The movable end of the telescopic rod 113 is fixedly connected to a fixing clip 114. Connecting ears 115 extend vertically from both sides of the fixing clip 114. The top of the plasma spray gun 12 is fixed by two opposing fixing clips 114, and adjacent connecting ears 115 are fixed by fixing bolts 116.

[0026] The fine-tuning component 11 also includes a connecting plate 117 disposed on the slide rail assembly 111. The connecting plate 117 is provided with an adjusting rod 118. One end of the adjusting rod 118 is rotatably connected to the connecting plate 117, and the other end passes through the mounting bracket 13 and is threadedly connected to the mounting bracket 13.

[0027] In actual use, the position of the plasma spray gun 12 can be adjusted in the horizontal and vertical directions through the slide rail assembly 111 and the telescopic rod 113 to adapt to the cleaning needs of different specifications of tabs; by rotating the adjusting rod 118, the mounting base 112 can be pushed to slide along the slide rail assembly 111, thereby adjusting the position of the plasma spray gun 12.

[0028] The flattening assembly 14 includes a bracket 141 and a first motor 142 mounted on the bracket 141. The bracket 141 is symmetrically distributed on both sides of the conveying device 5, and two pressure rollers 143 are arranged vertically between them. One end of one pressure roller 143 is fixedly connected to the output end of the first motor 142, and a gear 144 is provided at the end of the pressure roller 143 away from the first motor 142. The two pressure rollers 143 are driven by the meshing of the gear 144 to achieve synchronous reverse rotation. The surface of the pressure roller 143 is covered with a flexible material, the flattening pressure is controlled at 0.1-0.2MPa, the rotation speed is 50-80r / min, and the tab warpage is ≤0.05mm.

[0029] The pretreatment unit 1 is also equipped with an inert gas protection mechanism, specifically a nitrogen protective cover (not shown in the figure) covering the pretreatment area and the positioning area, which introduces nitrogen with a purity of ≥99.99% into the connection area to make the local oxygen content ≤0.1% and prevent secondary oxidation of the electrode surface after cleaning.

[0030] like Figure 3 as well as Figure 4 As shown, the positioning unit 2 includes a lifting component 22, a visual positioning component 21, a laser displacement sensor 24, and an adsorption component 23.

[0031] Specifically, the lifting assembly 22 includes a connecting frame 221 disposed inside the conveying device 5, a limiting rod 222 slidably connected to the connecting frame 221, and a lifting cylinder 223 disposed directly below the connecting frame 221. The output end of the lifting cylinder 223 is fixedly connected to the bottom surface of the connecting frame 221.

[0032] When the electrode tab is conveyed to the adsorption chamber 231, the lifting cylinder 223 drives the connecting frame 221 to descend, causing the conveying device 5 to fall, and the electrode tab falls smoothly onto the adsorption assembly 23; after welding is completed, the lifting cylinder 223 drives the conveying device 5 to reset and continue to transport the electrode tab.

[0033] The visual positioning component 21 includes a rotating base 211, on which a rotating bracket 212 is fixedly mounted. A second motor 214 is fixedly mounted on the top of the rotating bracket 212. The output end of the second motor 214 is provided with a threaded rod 217. A slider 213 is provided on the threaded rod 217 and is slidably connected to the rotating bracket 212. A binocular camera 215 is rotatably connected to one end of the slider 213 facing the conveying device 5. An adjustment knob 216 for adjusting the orientation of the binocular camera 215 is also provided on one side of the slider 213.

[0034] When the second motor 214 starts, the threaded rod 217 fixedly connected to its output end drives the slider 213 to slide along the rotating bracket 212, thereby changing the longitudinal position of the binocular camera 215. The shooting angle of the binocular camera 215 can be changed by manually adjusting the adjustment knob 216, thus adapting to the positioning of electrode tabs of different specifications. The pixel accuracy of the binocular camera 215 is... The sampling frequency is ≥400fps, and it is jointly calibrated with the laser displacement sensor with a resolution of ±0.002mm to establish a coordinate system.

[0035] like Figure 4 As shown, the adsorption assembly 23 includes a base 233, with an adsorption chamber 231 at the top of the base 233. The upper surface of the adsorption chamber 231 has several adsorption holes 232 communicating with its interior. An air pump 234 is also provided on one side of the base 233. When the air pump 234 is working, it creates a negative pressure in the adsorption chamber 231, thereby firmly adsorbing and fixing the tabs through the adsorption holes 232.

[0036] The welding unit 3 includes an XYZ three-axis combined slide 31, a laser welding head 32, and a temperature sensor 33. The laser welding head 32 is located directly above the adsorption cavity 231, and the temperature measuring end of the temperature sensor 33 faces the adsorption cavity 231.

[0037] Furthermore, the central control system stores a welding parameter library. When the electrode enters the welding station, the laser displacement sensor 24 of the positioning unit 2 detects the electrode thickness in real time. The central control system automatically identifies the electrode specifications and retrieves the corresponding reference parameters from the parameter library to ensure that each electrode can obtain the initial welding energy that matches its characteristics, avoiding problems such as insufficient energy (lack of fusion) or excessive energy (burn-through) caused by fixed parameters.

[0038] Specifically, the temperature sensor 33 is an infrared temperature sensor with a temperature measurement accuracy of ±5℃, used to monitor the weld temperature in real time and feed it back to the central control system. When the weld temperature is below 80% of the material's melting point, the central control system controls the laser welding head 32 to increase its power by 5% per second; when the temperature is above 120% of the melting point, it reduces the power by 8% per second, achieving dynamic closed-loop regulation.

[0039] Furthermore, the laser welding head 32 adopts a segmented welding strategy: first, spot welding is performed at both ends of the mating surface, with a weld diameter of 1 to 1.5 mm; then, continuous welding is performed along the weld seam; finally, additional welding is performed at both ends and the middle of the weld seam to ensure that the weld seam is uniform and reliable.

[0040] like Figure 6 As shown, the detection unit 4 includes a weld detection component 41 and a resistance detection component 42.

[0041] Specifically, the weld inspection assembly 41 includes an inspection bracket 411, a sliding platform 412 slidably connected to the top of the inspection bracket 411, and an industrial camera 413 fixedly mounted on the lower surface of the sliding platform 412. The industrial camera 413 is located directly above the conveying device 5. The industrial camera 413 acquires weld images and analyzes the weld appearance through image processing algorithms, with a grayscale value deviation of ≤10% as the pass standard.

[0042] Specifically, the resistance detection assembly 42 includes a micro-ohmmeter 421, a lifting plate 422, detection heads 423 disposed at both ends of the lifting plate 422, wiring terminals 425 corresponding to each detection head 423, and a cylinder 424. The wiring terminals 425 are electrically connected to the micro-ohmmeter 421 via wires. The cylinder 424 drives the lifting plate 422 to rise, causing the detection heads 423 to contact the electrodes. The micro-ohmmeter 421 measures the contact resistance. This meets the passing standard.

[0043] All inspection data from inspection unit 4 are uploaded to the central control system in real time via industrial Ethernet. The central control system analyzes the data. If the weld is qualified, it proceeds to the next process; if it is unqualified, it automatically identifies the defect type, generates a repair welding instruction, and returns to welding unit 3 for local repair welding; if the re-inspection after repair welding is still unqualified, it is marked as scrap. Example 2

[0044] This embodiment provides a method for using a precise connection device for preventing poor soldering of energy storage battery tabs, applied to the device described in Embodiment 1, including the following steps: S1. Pre-treatment: The electrode tabs enter the pre-treatment unit 1 via the conveyor 5. The plasma spray gun 12 impacts the electrode tab connection surface with appropriate power and flow rate to remove the surface oxide layer. Subsequently, the electrode tabs enter the flattening assembly 14, where the pressure roller 143 applies appropriate pressure to flatten them, controlling the electrode tab warpage within the required range. A nitrogen protective hood introduces high-purity nitrogen into the connection area to maintain a low local oxygen content and prevent secondary oxidation.

[0045] S2. Positioning: The pre-treated electrode tabs enter the positioning unit 2. When the electrode tabs are conveyed to the top of the adsorption chamber 231, the lifting cylinder 223 drives the connecting frame 221 to descend, the conveying device 5 falls, and the electrode tabs smoothly land on the adsorption chamber 231. The binocular camera 215 and the laser displacement sensor 24 acquire three-dimensional images of the electrode tabs and the busbar, extract coordinate information, and calculate the docking deviation. The laser displacement sensor 24 detects the thickness of the electrode tabs. The central control system adjusts the position of the electrode tabs by controlling the start and stop of the conveying device 5. After the adjustment is in place, the air pump 234 starts, generating negative pressure through the adsorption hole 232 to fix the electrode tabs.

[0046] S3. Welding: The central control system retrieves the corresponding welding parameters from the welding parameter library based on the electrode thickness and material. The position of the laser welding head 32 is adjusted by controlling the XYZ three-axis combined slide 31 to ensure that the horizontal deviation and contact deviation meet the accuracy requirements. The laser welding head 32 first performs spot welding at both ends of the mating surface, then performs continuous welding along the weld seam, and finally performs supplementary welding at both ends and the middle of the weld seam.

[0047] During the welding process, the temperature sensor 33 monitors the weld temperature in real time. When the temperature is lower than the set threshold of the material's melting point, the central control system controls the laser power to be increased appropriately. When the temperature is higher than the set threshold of the material's melting point, the power is reduced appropriately to ensure good weld fusion and avoid burn-through.

[0048] S4. Inspection: After welding is completed, the lifting cylinder 223 drives the conveying device 5 to reset, and the electrode tab continues to be conveyed to the inspection unit 4. The industrial camera 413 acquires weld images and analyzes the weld appearance; the cylinder 424 drives the lifting plate 422 to rise, and the inspection head 423 contacts the electrode tab, and the micro-ohmmeter 421 measures the contact resistance; the miniature tensile sensor applies pre-tension to detect whether the weld is loose. All inspection data are uploaded to the central control system in real time via industrial Ethernet.

[0049] S5. Closed-loop feedback: The central control system analyzes the test data. If all indicators are qualified, the electrode proceeds to the next process. If a non-conformity is found during inspection, the system automatically identifies the defect type, generates a repair welding instruction, and returns to step S3 for local repair welding. If the re-inspection after repair welding still fails, it is marked as scrap. Example 3

[0050] To verify the overall superiority of the technical solution of this invention, Example 3 was set up using existing conventional electrode welding process: no plasma pretreatment (manual wiping only), mechanical block positioning, fixed laser parameter welding, and offline sampling inspection. All other conditions were the same as in Example 2, with the same electrode specifications. The same number of electrodes were tested in each group, and the tests were repeated multiple times to obtain the average value. Example 4

[0051] In this embodiment, the welding method for the battery tabs is as follows: S1. The electrode tab to be welded directly enters the positioning unit. The three-dimensional position information of the electrode tab is collected by the visual positioning component and the laser displacement sensor. The central control system controls the precision positioning platform to adjust the position of the electrode tab so that the docking deviation is ≤±0.1mm. The adsorption component fixes the electrode tab. S2, Welding: The central control system calls up the corresponding welding parameters from the welding parameter library according to the electrode thickness and material, controls the laser welding head to perform segmented welding, and at the same time the temperature sensor monitors the weld temperature in real time and feeds it back to the central control system to dynamically adjust the welding power. S3. Inspection: After welding is completed, the inspection unit performs visual inspection, contact resistance measurement and tensile test on the weld, and uploads the inspection data to the central control system. S4. Closed-loop feedback: The central control system analyzes the detection data. If the weld is qualified, it proceeds to the next process; if it is unqualified, it identifies the defect type, generates a repair welding instruction, and returns to step S3 for repair welding; if the re-inspection after repair welding is still unqualified, it is marked as scrap.

[0052] Compared with Example 2, this example eliminates the plasma cleaning and flattening process, allowing the electrode tabs to be directly positioned and welded. Example 5

[0053] In this embodiment, the welding method for the battery tabs is as follows: S1. Pre-treatment: The electrode tabs enter the pre-treatment unit via a conveying device, where the surface oxide layer is removed by a plasma cleaning mechanism, the electrode tabs are flattened by a flattening mechanism, and an inert gas protection mechanism is used to prevent secondary oxidation. S2. Positioning: The pre-treated tabs are mechanically positioned by mechanical stops; S3, Welding: Control the laser welding head to perform segmented welding, while the temperature sensor monitors the weld temperature in real time and feeds it back to the central control system to dynamically adjust the welding power; S4. Inspection: After welding is completed, the inspection unit performs visual inspection, contact resistance measurement and tensile test on the weld, and uploads the inspection data to the central control system. S5. Closed-loop feedback: The central control system analyzes the detection data. If the weld is qualified, it proceeds to the next process; if it is unqualified, it identifies the defect type, generates a repair welding instruction, and returns to step S3 for repair welding; if the re-inspection after repair welding is still unqualified, it is marked as scrap.

[0054] Compared with Example 2, this example eliminates the visual positioning and laser displacement sensor and uses mechanical stop positioning. Example 6

[0055] In this embodiment, the welding method for the battery tabs is as follows: S1. Pre-treatment: The electrode tabs enter the pre-treatment unit via a conveying device, where the surface oxide layer is removed by a plasma cleaning mechanism, the electrode tabs are flattened by a flattening mechanism, and an inert gas protection mechanism is used to prevent secondary oxidation. S2, Positioning: The pre-processed electrode tabs enter the positioning unit. The visual positioning component and the laser displacement sensor collect the three-dimensional position information of the electrode tabs. The central control system controls the precision positioning platform to adjust the position of the electrode tabs so that the docking deviation is ≤±0.1mm. The adsorption component fixes the electrode tabs. S3, Welding: The central control system calls up the corresponding welding parameters from the welding parameter library according to the electrode thickness and material, controls the laser welding head to perform segmented welding, and at the same time the temperature sensor monitors the weld temperature in real time and feeds it back to the central control system to dynamically adjust the welding power. S4. Inspection: After welding is completed, the inspection unit performs visual inspection, contact resistance measurement and tensile test on the weld, and uploads the inspection data to the central control system; the welded products directly enter the next process.

[0056] Compared with Example 2, this example eliminates the online inspection and repair welding functions. After welding, the product directly enters the next process, and defective products are rejected through subsequent offline inspection.

[0057] The performance test results of the products obtained by the electrode welding methods described in Examples 2 to 6 are shown in the table below: From the above test results, we can conclude that: All indicators of Example 3 are significantly worse than those of the embodiments of the present invention, with a poor solder joint rate as high as 8.2% and contact resistance... The low production efficiency and high scrap rate confirm the shortcomings of the existing technology.

[0058] The failure rate of Example 4 was significantly higher than that of Example 2, and the contact resistance was also deteriorated, indicating that plasma cleaning and leveling are crucial for removing the oxide layer and ensuring the metallurgical bonding of the weld.

[0059] The rate of incomplete welds in Example 5 increased to 5.1%, indicating that excessive butt joint deviation reduces the effective welding area and increases the risk of incomplete welds.

[0060] Although the rate of poor soldering in Example 6 was lower than that of other comparative examples (3.8%), it was still significantly higher than that in Example 2, and the scrap rate was high because the lack of online repair soldering resulted in defective products not being repaired in a timely manner.

[0061] Comparative experiments between Examples 3-6 and Example 2 show that traditional processes and solutions lacking key features cannot achieve the comprehensive performance level of this invention. Example 2, using traditional processes, suffers from comprehensive degradation of all indicators, with persistently high rates of cold solder joints and scrap. Examples 4-6, lacking any feature in the three core stages of pretreatment, positioning, and real-time detection closed-loop, respectively, all lead to a significant increase in the rate of cold solder joints and a decrease in connection strength and conductivity. This demonstrates that the synergistic effect of pretreatment, positioning, adaptive welding, and real-time detection is necessary to effectively prevent the generation of cold solder joints. Example 2 achieves optimal performance in key indicators such as cold solder joint rate, connection strength, contact resistance, production efficiency, and scrap rate, fully verifying the integrity and indivisibility of the technical solution of this invention.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precise connection device for preventing false soldering of energy storage battery tabs, comprising a conveying device (5) and a central control system, characterized in that: A pre-processing unit (1), a positioning unit (2), a welding unit (3), and a detection unit (4) are sequentially arranged along the conveying direction of the conveying device (5), and the pre-processing unit (1), the positioning unit (2), the welding unit (3), and the detection unit (4) are all electrically connected to the central control system. The pretreatment unit (1) includes a plasma cleaning mechanism, a flattening mechanism, and an inert gas protection mechanism; The positioning unit (2) includes a visual positioning component (21), a lifting component (22), a laser displacement sensor (24), and an adsorption component (23). The welding unit (3) includes an XYZ three-axis combined slide (31), a laser welding head (32), a temperature sensor (33), and a welding parameter library stored in the central control system; The detection unit (4) includes a weld detection component (41) and a resistance detection component (42).

2. The energy storage battery tab anti-fraud precise connection device according to claim 1, characterized in that, The plasma cleaning mechanism includes a mounting frame (13), a plasma spray gun (12) mounted on the mounting frame (13), and a fine-tuning component (11) for adjusting the position of the plasma spray gun (12).

3. The energy storage battery tab anti-fraud precise connection device according to claim 1, characterized in that, The flattening mechanism includes a support (141), a first motor (142), and two pressure rollers (143) distributed vertically; the inert gas protection mechanism is a nitrogen protective cover covering the pretreatment area and the positioning area.

4. The energy storage battery tab anti-fraud precise connection device according to claim 2, characterized in that, The fine-tuning component (11) includes a slide rail assembly (111), a mounting base (112) slidably connected to the slide rail assembly (111), a telescopic rod (113) provided on the mounting base (112), and a fixing clamp (114) fixedly connected to the movable end of the telescopic rod (113). The fixing clamp (114) has connecting ears (115) on both sides. The plasma spray gun (12) is clamped between two opposing fixing clamps (114), and adjacent connecting ears (115) are fixed by fixing bolts (116). The fine-tuning component (11) also includes a connecting plate (117) disposed on the slide rail assembly (111). The connecting plate (117) is provided with an adjusting rod (118). One end of the adjusting rod (118) is rotatably connected to the connecting plate (117), and the other end passes through the mounting bracket (13) and is threadedly connected to the mounting bracket (13).

5. The energy storage battery tab anti-fraud precise connection device according to claim 1, characterized in that, The visual positioning component (21) includes a rotating base (211), a rotating bracket (212) fixed on the rotating base (211), a second motor (214) set at the top of the rotating bracket (212), a threaded rod (217) connected to the output end of the second motor (214), a slider (213) threadedly engaged with the threaded rod (217) and slidably connected to the rotating bracket (212), and a binocular camera (215) rotatably connected to the slider (213). The slider (213) is provided with an adjustment knob (216) for adjusting the angle of the binocular camera (215).

6. The energy storage battery tab anti-fraud precise connection device according to claim 1, characterized in that, The lifting assembly (22) includes a connecting frame (221) disposed inside the conveying device (5), a limiting rod (222) slidably connected to the connecting frame (221), and a lifting cylinder (223) disposed directly below the connecting frame (221). The output end of the lifting cylinder (223) is fixedly connected to the bottom surface of the connecting frame (221).

7. The energy storage battery tab anti-fraud precise connection device according to claim 1, characterized in that, The adsorption assembly (23) includes a base (233), an adsorption cavity (231) disposed at the top of the base (233), a plurality of adsorption holes (232) opened on the upper surface of the adsorption cavity (231), and an air pump (234) communicating with the adsorption cavity (231); the laser welding head (32) is located directly above the adsorption cavity (231), and the temperature measuring end of the temperature sensor (33) faces the adsorption cavity (231).

8. The energy storage battery tab anti-fraud precise connection device according to claim 1, characterized in that, The weld inspection assembly (41) includes an inspection bracket (411), a sliding platform (412) slidably connected to the top of the inspection bracket (411), and an industrial camera (413) fixed to the lower surface of the sliding platform (412). The industrial camera (413) is located above the conveying device (5).

9. The energy storage battery tab anti-fraud precise connection device according to claim 1, characterized in that, The resistance detection assembly (42) includes a micro ohmmeter (421), a lifting plate (422), detection heads (423) disposed at both ends of the lifting plate (422), wiring terminals (425) corresponding to the detection heads (423), and a cylinder (424) for driving the lifting plate (422). The wiring terminals (425) are electrically connected to the micro ohmmeter (421) through wires.

10. A method of using a precise connection device for preventing poor soldering of energy storage battery tabs, applied to the device described in any one of claims 1 and 9, characterized in that, Includes the following steps: S1. Pretreatment: The electrode tabs enter the pretreatment unit (1) via the conveying device (5), where the surface oxide layer is removed by the plasma cleaning mechanism, the flattening mechanism flattens the electrode tabs, and the inert gas protection mechanism prevents secondary oxidation. S2, Positioning: The pre-processed electrode enters the positioning unit (2), the visual positioning component (21) and the laser displacement sensor (24) collect the three-dimensional position information of the electrode, the central control system controls the precision positioning platform to adjust the position of the electrode so that the docking deviation is ≤ ±0.1mm, and the adsorption component (23) fixes the electrode. S3, Welding: The central control system calls the corresponding welding parameters from the welding parameter library according to the electrode thickness and material, controls the laser welding head (32) to perform segmented welding, and at the same time the temperature sensor (33) monitors the weld temperature in real time and feeds it back to the central control system to dynamically adjust the welding power; S4. Inspection: After welding is completed, the inspection unit (4) performs visual inspection, contact resistance measurement and tensile test on the weld, and uploads the inspection data to the central control system. S5. Closed-loop feedback: The central control system analyzes the detection data. If the weld is qualified, it proceeds to the next process; if it is unqualified, it identifies the defect type, generates a repair welding instruction, and returns to step S3 for repair welding; if the re-inspection after repair welding is still unqualified, it is marked as scrap.

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