A false welding detection device for lithium battery processing

Abstract

The present application relates to the field of battery false welding detection, and particularly relates to a false welding detection equipment for lithium battery processing, which comprises a workbench, an electric sliding table slidingly arranged on the workbench, a mounting plate fixedly installed on the electric sliding table, and a control end fixedly installed on the mounting plate; the control end is provided with two welding guns arranged in front and back at the bottom, the front side is an initial head for continuous power supply, and the rear side is a repair welding head for power supply after detection triggering. Through the present application, two prominent problems existing in the prior art are solved: firstly, the mode of "welding and then detecting" is generally adopted, and once false welding is found, rework or scrapping will additionally increase working hours and cost; secondly, false welding has various performance modes such as bulging, depression and widening, different detection methods have different characteristics, and it is more difficult to accurately detect all types of false welding at the same time, so that the technical problem of higher requirement for the detection scheme is solved.

Description

Technical Field

[0001] This invention relates to the field of battery solder joint detection, and more particularly to a solder joint detection device for lithium battery processing. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage power stations, and the consumer electronics industry, lithium batteries, as a core energy storage component, are experiencing continuous growth in both production and demand. The welding quality of lithium battery casings, tabs, connectors, and other components directly determines the battery's electrical performance, lifespan, and safety reliability.

[0003] For example, in patent application number CN202410074976.7, entitled "A System for Detecting Poor Solder Joints in Lithium Battery Processing," the system includes a base, a detection chamber, a pushing mechanism, a driving mechanism, and a flipping mechanism. The detection chamber is installed at the center of the top of the base, and a CCD detection mechanism is installed on the inner wall of the top of the detection chamber for detecting poor solder joints in lithium batteries. Two pushing mechanisms are provided, installed on opposite sides of the top of the base. The pushing mechanism on one side of the top of the base pushes the lithium battery to be tested into the detection chamber, while the pushing mechanism on the other side pushes the tested lithium battery out of the detection chamber. The driving mechanism is installed at one end of the inner wall of the detection chamber to move the CCD detection mechanism. This application can improve the efficiency of lithium battery testing and save manpower.

[0004] Currently, there are several commonly used inspection methods in the industry: one is manual visual inspection, where inspectors use microscopes or magnifying glasses to directly observe the appearance of the weld to determine if there are problems such as incomplete welding or cracks; another is X-ray inspection, which uses X-rays to penetrate the weld to observe the internal structure, and can see defects such as porosity and lack of fusion inside the weld. The inspection results are relatively accurate and are a widely recognized quality inspection method in the industry; and the third is visual inspection, which uses industrial cameras to take pictures of the weld and then uses image processing algorithms to identify defects. It has a high degree of automation and fast inspection speed, making it suitable for mass production lines.

[0005] However, most of these testing methods follow the "weld first, then inspect" approach, meaning the product is welded first and then tested. If a faulty weld is detected, rework must be arranged, or the product must be scrapped. This adds an extra step, which increases the overall welding time and cost.

[0006] Furthermore, cold welds themselves exhibit different forms, such as bulging cold welds (where the internal weld is not fully penetrated but the surface bulges), concave cold welds (where the surface is sunken), and widening cold welds (where the weld spreads out to both sides). Different detection methods have varying sensitivities to different types of cold welds, and accurately detecting all of these types simultaneously requires more sophisticated detection solutions. Summary of the Invention

[0007] In view of this, the purpose of this invention is to propose a faulty solder joint detection device for lithium battery processing, in order to solve two prominent problems in the existing detection schemes: first, the "inspect after soldering" mode is generally adopted, and once a faulty solder joint is found, rework or scrapping will increase the time and cost of labor; second, faulty solder joints themselves have various manifestations such as bulging, denting, and widening, and different detection methods are different. To accurately detect all types of faulty solder joints at the same time, the technical requirements for the detection scheme are also higher.

[0008] To achieve the above objectives, the present invention provides a faulty solder joint detection device for lithium battery processing, including a worktable, an electric slide table slidably disposed on the worktable, a mounting plate fixedly installed on the electric slide table, and a control terminal fixedly installed on the mounting plate.

[0009] The bottom of the control terminal is equipped with two welding torches arranged in front and behind. The front one is an initial head that is continuously powered, and the rear one is a repair welding head that is powered after detection and triggering. The side wall of the control terminal is equipped with a first switch and a second switch for triggering repair welding.

[0010] The mounting plate is also provided with a hydraulic amplification assembly, which includes a first oil chamber and a second oil chamber that are interconnected. The cross-sectional area of ​​the first oil chamber is larger than that of the second oil chamber. A first piston plate is provided in the first oil chamber, and a second piston plate is provided in the second oil chamber. The piston rod on the second piston plate extends out of the second oil chamber and is connected to a second trigger rod. When the second trigger rod moves upward, it squeezes and triggers the first switch.

[0011] A detection rod is slidably mounted vertically below the mounting plate. The bottom of the detection rod contacts the weld and its top extends into the first oil cavity. A first trigger rod is provided on the outer wall of the section of the detection rod that extends into the oil cavity. When the detection rod moves down, the first trigger rod squeezes and triggers the second switch. A second spring is provided between the detection rod and the mounting plate to provide downward preload for the detection rod.

[0012] The mounting plate has two sets of horizontally sliding detection plates symmetrically arranged at the bottom. A first spring is provided between the two detection plates to provide an inward pulling force, so that the detection plates are always in contact with the two sides of the weld.

[0013] A floating transmission component is slidably sleeved on the outer side of the detection rod. The upper end of the floating transmission component is connected to the bottom of the first piston plate. When the detection plate expands outward, it pushes the floating transmission component to move upward, thereby driving the first piston plate to move upward synchronously.

[0014] The bulging type of poor weld is triggered by the upward movement of the detection rod pushing the first piston plate; the widening type of poor weld is triggered by the outward expansion of the detection plate and the movement of the first piston plate through the floating transmission component. Both types are triggered by hydraulic amplification before triggering the first switch; the concave type of poor weld is triggered by the downward movement of the detection rod directly triggering the second switch. All three types of poor weld can independently trigger the welding head to be energized.

[0015] Furthermore, the initial head and the repair welding head maintain a fixed distance along the direction of travel of the electric slide. After a poor weld is detected, the repair welding head is energized and completes the repair welding when it travels with the electric slide to the position of the poor weld.

[0016] Furthermore, the first oil chamber and the second oil chamber are coaxially stacked, with the first oil chamber located below and the second oil chamber located above. The two oil chambers are connected by a middle oil passage. The oil chambers are filled with hydraulic oil. A third spring is provided in the first oil chamber and acts above the first piston plate. A fourth spring is provided between the top of the second piston plate and the inner wall of the second oil chamber. The two sets of springs together provide a restoring force for the piston assembly.

[0017] Furthermore, the bottom of the mounting plate is symmetrically fixed with connecting rods, the lower end of the connecting rods is connected to an upper spring seat, the upper spring seat is slidably sleeved on the outside of the detection rod, the outer wall of the detection rod is fixed with a lower spring seat, and the second spring is disposed between the upper spring seat and the lower spring seat. The second spring is a compression spring and is always in a pre-compressed state.

[0018] Furthermore, a connecting plate is symmetrically fixed at the bottom of the mounting plate, and an extension rod is horizontally slidably provided on the connecting plate. The detection plate is fixed to the inner end of the extension rod, and the first spring is sleeved on the outer side of the extension rod. The two ends respectively abut against the detection plate and the connecting plate. The inner end face of the detection plate is provided with a rounded chamfer, and a push block with a bevel is fixed on its top.

[0019] Furthermore, the floating transmission component includes a top plate and a sleeve rod. The top plate is slidably sleeved on the outside of the detection rod. The bottom of the top plate is provided with an inclined surface that corresponds to and cooperates with the inclined surface of the top of the push block. When the detection plate expands outward, the push block pushes the top plate upward along the inclined surface. The sleeve rod is fixed to the top of the top plate, and its upper end extends into the first oil cavity and is rigidly connected to the bottom of the first piston plate.

[0020] Furthermore, the sleeve rod has a groove in the vertical direction on its side wall. The first trigger rod passes through the groove and can slide relative to it. When the detection rod moves upward, the first trigger rod abuts against the upper end of the groove, causing the sleeve rod and the first piston plate to move upward synchronously. When the detection rod moves downward, the first trigger rod slides freely along the groove. The sleeve rod and the first piston plate remain in their original positions to prevent the detection rod from getting stuck when it moves downward to detect the depression.

[0021] Furthermore, the first switch and the second switch are connected in parallel, and the power supply circuit of the welding head can be connected when either switch is triggered.

[0022] Furthermore, under normal conditions, the upper end face of the detection rod is in contact with or maintains a small gap with the bottom surface of the first piston plate. When there is a bulging type of poor weld, the detection rod is pushed upward, directly pushing the first piston plate to move upward. When there is a concave type of poor weld, the detection rod moves downward independently under the action of the second spring, without driving the first piston plate, and the two do not interfere with each other.

[0023] Furthermore, during operation, the electric slide table drives the mounting plate to move along the weld seam. The initial head is continuously powered to complete the first round of welding. The detection rod and the detection plate scan the weld seam that has just been welded synchronously. When a defective weld is encountered, the corresponding path triggers the switch, the repair welding head is powered on, and it moves to the defective weld position to complete the repair welding. After passing the defective weld area, the switch is reset, the repair welding head is powered off, and the normal welding state is restored, realizing a self-closed-loop processing of welding and inspection at the same time, and repairing as soon as it is detected.

[0024] The beneficial effects of this invention are:

[0025] 1. This invention integrates a purely mechanical hydraulic detection structure that can simultaneously detect three types of weld defects: bulges, dents, and widening. It utilizes large and small oil chambers to form a hydraulic amplification component to amplify the minute deformation and displacement of the weld. It eliminates the need for electronically controlled detection components such as cameras and photoelectric sensors that are susceptible to welding slag and electromagnetic interference. It can fully cover the identification of various weld defects, solving the problems of existing detection equipment having limited identification types and being prone to false detection and missed detection under harsh working conditions. At the same time, it is combined with a structure that arranges initial welding and repair welding heads at the front and rear and moves synchronously with the slide table to eliminate the traditional offline post-weld detection mode. Immediate on-site repair welding is performed after detection, saving rework and scrapping links, greatly reducing processing time and material loss, and improving the production efficiency of lithium battery casing welding.

[0026] 2. This invention achieves independent movement of the width detection and the upper and lower concave / convex detection paths through a unidirectional sliding cooperation structure between the sleeve groove and the first trigger rod of the detection rod. This solves the defects of traditional single floating plate structures, such as the middle rod getting stuck when it moves down and the failure to detect concave and incomplete welds. The detection plates on both sides are equipped with retracting springs, and the middle detection rod is equipped with a downward pressure pre-tightening spring, which can adapt to different specifications of weld contours and always fit the weld surface. With the parallel double switch independent triggering repair welding circuit, the repair welding power is immediately turned on when a defect is detected. The detection response is sensitive and the equipment is highly versatile. Moreover, the piston assembly is equipped with a reset spring that can automatically reset, which can continuously and stably complete the weld inspection operation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the cold solder joint detection equipment in this invention;

[0029] Figure 2 This is a schematic diagram of the electric slide table and welding assembly in this invention;

[0030] Figure 3 This is a schematic diagram of the electric slide table and the cold solder joint detection component in this invention;

[0031] Figure 4 This is a schematic diagram of the welding assembly and the cold weld detection assembly in this invention;

[0032] Figure 5 This is a schematic diagram of the cold solder joint detection component in this invention;

[0033] Figure 6 This is an isometric sectional view of the cold solder joint detection component in this invention;

[0034] Figure 7 This is an isometric sectional view of the cold solder joint detection component in this invention from another angle;

[0035] Figure 8 This is a schematic diagram of the widened cold solder joint detection component in this invention;

[0036] Figure 9 This is a schematic diagram of the detection component for bulging and recessed solder joints in this invention;

[0037] Figure 10 for Figure 7 Enlarged view of the structure at point A.

[0038] The diagram is marked as follows:

[0039] 1. Workbench; 2. Electric slide table; 3. Mounting plate; 301. Connecting rod; 302. Upper spring seat; 4. Control end; 401. First switch; 402. Second switch; 5. First oil chamber; 6. Second oil chamber; 7. Welding torch; 8. Detection rod; 801. Lower spring seat; 802. First trigger rod; 9. Connecting plate; 10. Extension rod; 11. Detection plate; 1101. Push block; 12. First spring; 13. Second spring; 14. Top plate; 1401. Sleeve rod; 1402. Waist groove; 15. First piston plate; 16. Third spring; 17. Second piston plate; 18. Piston rod; 19. Second trigger rod; 20. Fourth spring. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0041] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] In a first aspect, the present invention provides a faulty solder joint detection device for lithium battery processing, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, it includes a worktable 1, an electric slide 2 slidably disposed on the worktable 1, a mounting plate 3 fixedly installed on the electric slide 2, and a control terminal 4, which is fixedly installed on the mounting plate 3.

[0043] The bottom of the control terminal 4 is equipped with two welding guns 7 arranged in front and behind. The front side is the initial head that is continuously powered, and the rear side is the repair welding head that is powered after detection and triggering. The side wall of the control terminal 4 is equipped with a first switch 401 and a second switch 402 for triggering repair welding.

[0044] The mounting plate 3 is also provided with a hydraulic amplification assembly, which includes a first oil chamber 5 and a second oil chamber 6 that are interconnected. The cross-sectional area of ​​the first oil chamber 5 is larger than that of the second oil chamber 6. A first piston plate 15 is provided in the first oil chamber 5. A second piston plate 17 is provided in the second oil chamber 6. A piston rod 18 on the second piston plate 17 extends out of the second oil chamber 6 and is connected to a second trigger rod 19. When the second trigger rod 19 moves upward, it squeezes and triggers the first switch 401.

[0045] A detection rod 8 is slidably mounted vertically below the mounting plate 3. The bottom of the detection rod 8 contacts the weld, and its top extends into the first oil cavity 5. A first trigger rod 802 is provided on the outer wall of the section of the detection rod 8 that extends into the oil cavity. When the detection rod 8 moves down, the first trigger rod 802 squeezes and triggers the second switch 402. A second spring 13 is provided between the detection rod 8 and the mounting plate 3 to provide downward preload for the detection rod 8.

[0046] The bottom of the mounting plate 3 is symmetrically provided with two sets of horizontally sliding detection plates 11. A first spring 12 is provided between the two detection plates 11 to provide an inward pulling force so that the detection plates 11 are always in contact with the two sides of the weld edge.

[0047] A floating transmission component is slidably sleeved on the outer side of the detection rod 8. The upper end of the floating transmission component is connected to the bottom of the first piston plate 15. When the detection plate 11 expands outward, it pushes the floating transmission component to move upward, which in turn drives the first piston plate 15 to move upward synchronously.

[0048] The bulging type of poor weld is triggered by the upward movement of the detection rod 8 pushing the first piston plate 15. The widening type of poor weld is triggered by the outward expansion of the detection plate 11 and the first piston plate 15 driven by the floating transmission component. Both are triggered by hydraulic amplification and then the first switch 401 is activated. The concave type of poor weld is triggered by the downward movement of the detection rod 8 directly triggering the second switch 402. All three types of poor weld can be independently triggered to energize the repair welding head.

[0049] In this embodiment, the lithium battery workpiece to be welded is fixed on the worktable 1 during operation. The electric slide 2 drives the mounting plate 3 to move along the weld direction. The initial head is continuously energized to perform the first pass of welding on the weld. The detection rod 8 and the detection plates 11 on both sides follow the movement and scan the surface of the weld that has just been welded. When a bulging type of cold weld is encountered, the detection rod 8 is pushed upward by the weld bulge, pushing the first piston plate 15 to move upward. Oil enters the second oil chamber 6 from the first oil chamber 5. After hydraulic amplification, the second piston plate 17 and piston rod 18 move upward significantly. The second trigger rod 19 squeezes and triggers the first switch 401, energizing the welding head. When a widening type of cold weld is encountered, the weld spreads out to both sides. The two detection plates 11 are pushed outward to expand. The detection plates 11 drive the first piston plate 15 to move upward through the floating transmission component. After hydraulic amplification, the first switch 401 is triggered, and the welding head is energized. When a recessed weld is encountered, the detection rod 8 extends downward into the recessed area under the action of the second spring 13. The first trigger rod 802 moves downward and squeezes to trigger the second switch 402, energizing the welding head. After being energized, the welding head continues to move with the electric slide table 2. When it reaches the position of the weld, it is just right to repair the defect. After the detection passes through the weld area, all detection elements are reset, the switch is turned off, the welding head is de-energized, and the normal welding state is restored. The whole process realizes the self-closed-loop processing of welding and inspection at the same time and repairing the defect as soon as it is detected.

[0050] As one implementation method, such as Figure 2 , Figure 4 As shown, the initial head and the repair welding head maintain a fixed distance along the walking direction of the electric slide table 2. After a cold weld is detected, the repair welding head is energized and completes the repair welding when it moves to the position of the cold weld with the electric slide table 2.

[0051] In this embodiment, the front-to-back arrangement of the initial head and the repair welding head utilizes the travel distance to achieve the timing coordination of detection and repair welding, without the need for additional delay control or position calculation. Structurally, this ensures that the repair welding head is precisely placed at the detected cold weld position.

[0052] As one implementation method, such as Figure 6 , Figure 7 As shown, the first oil chamber 5 and the second oil chamber 6 are coaxially stacked, with the first oil chamber 5 located below and the second oil chamber 6 located above. The two oil chambers are connected by a middle oil passage. The oil chambers are filled with hydraulic oil. A third spring 16 is provided in the first oil chamber 5 and acts above the first piston plate 15. A fourth spring 20 is provided between the top of the second piston plate 17 and the inner wall of the second oil chamber 6. The two sets of springs together provide a restoring force for the piston assembly.

[0053] In this embodiment, the coaxial stacked structure makes the whole more compact. The first oil chamber 5 has a large cross-sectional area and the second oil chamber 6 has a small cross-sectional area. Based on Pascal's principle, the small displacement of the large piston is converted into a large displacement of the small piston after being transmitted by the oil, realizing the amplification of displacement output. It can amplify tiny solder joint defects of 0.1 to 0.5 mm to a stroke sufficient to trigger the switch. The third spring 16 and the fourth spring 20 together provide a downward reset force for the piston assembly. After the detection signal disappears, it pushes the piston assembly to automatically return to the initial position, ensuring the accuracy of the next detection. The cooperation of the two sets of springs also improves the reliability of reset.

[0054] As one implementation method, such as Figure 5 , Figure 9 As shown, a connecting rod 301 is symmetrically fixed at the bottom of the mounting plate 3. The lower end of the connecting rod 301 is connected to an upper spring seat 302. The upper spring seat 302 is slidably sleeved on the outside of the detection rod 8. A lower spring seat 801 is fixed on the outer wall of the detection rod 8. A second spring 13 is disposed between the upper spring seat 302 and the lower spring seat 801. The second spring 13 is a compression spring and is always in a pre-compressed state.

[0055] In this embodiment, the connecting rod 301 and the upper spring seat 302 provide a stable mounting reference for the second spring 13. The symmetrically arranged connecting rod 301 ensures that the detection rod 8 is subjected to balanced force, avoiding uneven loading and jamming. The second spring 13 is always in a pre-compression state, providing continuous downward pre-pressure to the detection rod 8, ensuring that the contact ball at the bottom of the detection rod 8 is always in close contact with the weld surface, and can follow the downward movement when encountering a depression, without jumping out of the air, thus ensuring reliable detection of depression-type poor welds.

[0056] As one implementation method, such as Figure 5 , Figure 8 As shown, a connecting plate 9 is symmetrically fixed at the bottom of the mounting plate 3. An extension rod 10 is horizontally slidable on the connecting plate 9. A detection plate 11 is fixed to the inner end of the extension rod 10. A first spring 12 is sleeved on the outer side of the extension rod 10. The two ends respectively abut against the detection plate 11 and the connecting plate 9. The inner end face of the detection plate 11 has a rounded chamfer. A push block 1101 with a bevel is fixed on its top.

[0057] In this embodiment, the connecting plate 9 and the extension rod 10 provide a stable horizontal sliding guide for the detection plate 11, ensuring that the detection plate 11 can only move along the width direction of the weld and will not wobble. The first spring 12 provides an inward preload for the detection plate 11, so that the two detection plates 11 are always in contact with the two sides of the weld. When the width of the weld changes, the detection plate 11 can move horizontally accordingly. The rounded chamfer on the inner side of the detection plate 11 can smoothly contact the side edge of the weld, reducing scratches and wear, and can also better adapt to weld edges of different shapes. The inclined surface at the top of the push block 1101 is used to convert the horizontal displacement of the detection plate 11 into the vertical displacement of the floating transmission component, realizing the conversion of the direction of movement.

[0058] As one implementation method, such as Figure 6 , Figure 7 , Figure 8 As shown, the floating transmission component includes a top plate 14 and a sleeve rod 1401. The top plate 14 is slidably sleeved on the outside of the detection rod 8. The bottom of the top plate 14 is provided with an inclined surface that corresponds to and cooperates with the inclined surface of the top of the push block 1101. When the detection plate 11 expands outward, the push block 1101 pushes the top plate 14 upward along the inclined surface. The sleeve rod 1401 is fixed to the top of the top plate 14, and its upper end extends into the first oil chamber 5 and is rigidly connected to the bottom of the first piston plate 15.

[0059] In this embodiment, the inclined surface at the bottom of the top plate 14 cooperates with the inclined surface at the top of the push block 1101 to form an inclined surface transmission mechanism, which converts the horizontal outward displacement of the detection plate 11 into the vertical upward displacement of the top plate 14, thereby realizing the conversion of the direction of motion. The sleeve rod 1401 transmits the vertical movement of the top plate 14 to the first piston plate 15, driving the hydraulic amplification component to operate. The top plate 14 is slidably sleeved on the outside of the detection rod 8 and can slide independently up and down along the detection rod 8 without interfering with the movement of the detection rod 8, thus ensuring the independence of width detection and up and down detection.

[0060] As one implementation method, such as Figure 10 As shown, a groove 1402 is formed on the side wall of the sleeve rod 1401 in the vertical direction. The first trigger rod 802 passes through the groove 1402 and can slide relative to the groove 1402. When the detection rod 8 moves upward, the first trigger rod 802 abuts against the upper end of the groove 1402, causing the sleeve rod 1401 and the first piston plate 15 to move upward synchronously. When the detection rod 8 moves downward, the first trigger rod 802 slides freely down the groove 1402. The sleeve rod 1401 and the first piston plate 15 remain in their original positions to prevent the detection rod 8 from getting stuck when it moves downward to detect the depression.

[0061] In this embodiment, the waist groove 1402 and the first trigger rod 802 cooperate to form a one-way transmission structure: upward transmission and downward disengagement. When the detection rod 8 encounters a bulge and moves upward, the first trigger rod 802 abuts against the upper end of the waist groove 1402, driving the sleeve rod 1401 and the first piston plate 15 to move upward synchronously, triggering the hydraulic amplification component. When the detection rod 8 encounters a depression and moves downward, the first trigger rod 802 slides freely downward along the waist groove 1402 without driving the sleeve rod 1401 and the first piston plate 15. At this time, the floating transmission component remains in its original position and will not obstruct the downward movement of the detection rod 8, thus completely solving the problem of the floating plate getting stuck and ensuring the independence and reliability of the depression-type cold weld detection.

[0062] As one implementation method, such as Figure 5 , Figure 6 As shown, the first switch 401 and the second switch 402 are connected in parallel, and the power supply circuit of the welding head can be connected when either switch is triggered.

[0063] In this embodiment, the parallel wiring of the two switches allows the first switch 401, which triggers bulging / widening poor solder joints, and the second switch 402, which triggers dented poor solder joints, to independently connect the power supply circuit of the repair solder head. Any poor solder joint form detected can trigger repair soldering, achieving full coverage detection of the three poor solder joint forms. They do not interfere with each other and are triggered independently, improving the comprehensiveness and reliability of the detection.

[0064] As one implementation method, such as Figure 7 , Figure 9 As shown, under normal conditions, the upper end face of the detection rod 8 is in contact with or maintains a small gap with the bottom surface of the first piston plate 15. When there is a bulging type of poor solder joint, the detection rod 8 is pushed upward, directly pushing the first piston plate 15 upward. When there is a concave type of poor solder joint, the detection rod 8 moves downward independently under the action of the second spring 13, without driving the first piston plate 15. The two do not interfere with each other.

[0065] In this embodiment, the detection rod 8 and the first piston plate 15 adopt a separate or micro-gap fit structure, so that the upward bulge detection and the downward dent detection do not interfere with each other: when there is a bulge, the detection rod 8 directly pushes the first piston plate 15, and triggers the upper switch after hydraulic amplification; when there is a dent, the detection rod 8 moves down independently and directly triggers the lower switch without moving the first piston plate 15 or being hindered by the floating transmission component. This structure ensures the independence of the detection in the two directions, avoids mutual interference, and improves the accuracy and reliability of the detection.

[0066] As one implementation method, such as Figure 1 As shown, during operation, the electric slide 2 drives the mounting plate 3 to move along the weld. The initial head is continuously powered to complete the first round of welding. The detection rod 8 and the detection plate 11 scan the weld that has just been welded. When a defective weld is encountered, the corresponding path triggers the switch, the repair welding head is powered on, and it moves to the defective weld position to complete the repair welding. After passing the defective weld area, the switch is reset, the repair welding head is powered off, and the normal welding state is restored, realizing the self-closed-loop processing of welding and inspection at the same time and repairing as soon as it is detected.

[0067] In this embodiment, the entire equipment adopts a self-closed-loop working mode of welding and testing simultaneously, and welding is repaired as soon as the test is detected. There is no need to stop or rework. Welding and testing are carried out at the same time, which greatly improves welding efficiency and yield.

[0068] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0069] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A faulty solder joint detection device for lithium battery processing, comprising a worktable (1), an electric slide (2) slidably disposed on the worktable (1), and a mounting plate (3) fixedly installed on the electric slide (2), characterized in that: It also includes a control terminal (4), which is fixedly mounted on the mounting plate (3); The bottom of the control terminal (4) is provided with two welding guns (7) arranged in front and behind. The front side is the initial head that is continuously powered, and the rear side is the welding head that is powered after detection and triggering. The side wall of the control terminal (4) is provided with a first switch (401) and a second switch (402) for triggering welding. The mounting plate (3) is also provided with a hydraulic amplification assembly, which includes a first oil chamber (5) and a second oil chamber (6) that are interconnected. The cross-sectional area of ​​the first oil chamber (5) is larger than that of the second oil chamber (6). A first piston plate (15) is provided in the first oil chamber (5), and a second piston plate (17) is provided in the second oil chamber (6). A piston rod (18) on the second piston plate (17) extends out of the second oil chamber (6) and is connected to a second trigger rod (19). When the second trigger rod (19) moves upward, it squeezes and triggers the first switch (401). A detection rod (8) is slidably provided vertically below the mounting plate (3). The bottom of the detection rod (8) contacts the weld and its top extends into the first oil cavity (5). A first trigger rod (802) is provided on the outer wall of the section of the detection rod (8) that extends into the oil cavity. When the detection rod (8) moves down, the first trigger rod (802) squeezes and triggers the second switch (402). A second spring (13) is provided between the detection rod (8) and the mounting plate (3) to provide downward preload for the detection rod (8). The mounting plate (3) has two sets of horizontally sliding detection plates (11) symmetrically arranged at the bottom. A first spring (12) is provided between the two detection plates (11) to provide an inward pulling force so that the detection plates (11) are always close to the two sides of the weld. A floating transmission component is slidably sleeved on the outside of the detection rod (8). The upper end of the floating transmission component is connected to the bottom of the first piston plate (15). When the detection plate (11) expands outward, it pushes the floating transmission component to move upward, thereby driving the first piston plate (15) to move upward synchronously. The bulging type of poor weld is triggered by the upward movement of the detection rod (8) pushing the first piston plate (15). The widening type of poor weld is triggered by the outward expansion of the detection plate (11) and the first piston plate (15) driven by the floating transmission component. Both are triggered by the first switch (401) after hydraulic amplification. The concave type of poor weld is triggered by the downward movement of the detection rod (8) directly triggering the second switch (402). All three types of poor weld can independently trigger the welding head to be energized.

2. The lithium battery processing cold solder joint detection equipment according to claim 1, characterized in that, The initial head and the repair welding head maintain a fixed distance along the walking direction of the electric slide (2). After a false weld is detected, the repair welding head is energized and completes the repair welding when it moves to the false weld position with the electric slide (2).

3. The lithium battery processing cold solder joint detection equipment according to claim 1, characterized in that, The first oil chamber (5) and the second oil chamber (6) are coaxially stacked. The first oil chamber (5) is located below and the second oil chamber (6) is located above. The two oil chambers are connected by a middle oil passage. The oil chambers are filled with hydraulic oil. A third spring (16) is provided in the first oil chamber (5) and acts above the first piston plate (15). A fourth spring (20) is provided between the top of the second piston plate (17) and the inner wall of the second oil chamber (6). The two sets of springs together provide a restoring force for the piston assembly.

4. The lithium battery processing cold solder joint detection equipment according to claim 1, characterized in that, The mounting plate (3) is symmetrically fixed with connecting rods (301) at the bottom. The lower end of the connecting rod (301) is connected to an upper spring seat (302). The upper spring seat (302) is slidably sleeved on the outside of the detection rod (8). The outer wall of the detection rod (8) is fixed with a lower spring seat (801). The second spring (13) is disposed between the upper spring seat (302) and the lower spring seat (801). The second spring (13) is a compression spring and is always in a pre-compression state.

5. The lithium battery processing cold solder joint detection equipment according to claim 1, characterized in that, The mounting plate (3) is symmetrically fixed with a connecting plate (9) at the bottom. An extension rod (10) is horizontally slidably provided on the connecting plate (9). The detection plate (11) is fixed to the inner end of the extension rod (10). The first spring (12) is sleeved on the outer side of the extension rod (10). Both ends abut against the detection plate (11) and the connecting plate (9) respectively. The inner end face of the detection plate (11) is provided with a rounded chamfer. A push block (1101) with a bevel is fixed on its top.

6. The lithium battery processing cold solder joint detection equipment according to claim 5, characterized in that, The floating transmission component includes a top plate (14) and a sleeve rod (1401). The top plate (14) is slidably sleeved on the outside of the detection rod (8). The bottom of the top plate (14) is provided with an inclined surface that corresponds to and cooperates with the top inclined surface of the push block (1101). When the detection plate (11) expands outward, the push block (1101) pushes the top plate (14) upward along the inclined surface. The sleeve rod (1401) is fixed on the top of the top plate (14), and its upper end extends into the first oil chamber (5) and is rigidly connected to the bottom of the first piston plate (15).

7. The lithium battery processing cold solder joint detection equipment according to claim 6, characterized in that, The sleeve rod (1401) has a waist groove (1402) on its side wall in the vertical direction. The first trigger rod (802) passes through the waist groove (1402) and can slide relative to the waist groove (1402). When the detection rod (8) moves up, the first trigger rod (802) abuts against the upper end of the waist groove (1402), causing the sleeve rod (1401) and the first piston plate (15) to move up synchronously. When the detection rod (8) moves down, the first trigger rod (802) slides down freely along the waist groove (1402). The sleeve rod (1401) and the first piston plate (15) remain in their original positions to avoid jamming when the detection rod (8) moves down to detect the depression.

8. The lithium battery processing cold solder joint detection equipment according to claim 1, characterized in that, The first switch (401) and the second switch (402) are connected in parallel, and the power supply circuit of the welding head can be connected when either switch is triggered.

9. The lithium battery processing cold solder joint detection equipment according to claim 1, characterized in that, Under normal conditions, the upper end face of the detection rod (8) is in contact with or maintains a small gap with the bottom surface of the first piston plate (15). When there is a bulge-type poor weld, the detection rod (8) is pushed upward and directly pushes the first piston plate (15) upward. When there is a recess-type poor weld, the detection rod (8) moves downward independently under the action of the second spring (13) without driving the first piston plate (15). The two do not interfere with each other.

10. A faulty solder joint detection device for lithium battery processing according to claim 1, characterized in that, During operation, the electric slide (2) drives the mounting plate (3) to move along the weld seam. The initial head is continuously powered to complete the first round of welding. The detection rod (8) and the detection plate (11) scan the weld seam that has just been welded. When a false weld defect is encountered, the corresponding path triggers the switch, the repair welding head is powered on, and it moves to the false weld position to complete the repair welding. After passing the false weld area, the switch is reset, the repair welding head is powered off, and the normal welding state is restored, realizing the self-closed-loop processing of welding and inspection at the same time and repairing as soon as it is detected.

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