Feeding detection equipment for lithium battery cell manufacturing and welding

Abstract

The invention discloses feeding detection equipment for lithium battery cell manufacturing and welding, and belongs to the technical field of cell material detection. The feeding detection equipment comprises a directional detection box and two feeding channels, and the upper end face and the lower end face of the directional detection box are connected with a feeding base and a feeding base correspondingly; and two deviation rectifying assemblies for detecting the flatness of the uneven tabs are arranged between the feeding seat and the feeding seat. Through the arrangement of the guide magnetic plate and the axis limiting block, the positive and negative surfaces can be automatically distinguished by utilizing the magnetic response characteristic of the nickel-plated layer of the negative tab and combining negative pressure adsorption, and the positive and negative surfaces are locked and distinguished by identifying the axis convex column of the positive tab through pressure feedback when the axis limiting block is pressed; meanwhile, the continuous pressure detection assembly and the point detection assembly are arranged, so that the wavy unevenness of the tabs can be detected by utilizing a continuous detection plate, large-range deformation is covered, and local unevenness of the tabs can be identified by utilizing a point detection plate, and tiny defects can be captured.

Description

Technical Field

[0001] The present invention relates to the technical field of battery core material detection, and in particular to a material feeding detection device for lithium battery core manufacturing welding. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and a non-aqueous electrolyte solution. Welding is a key step in the manufacturing of lithium battery cells, directly affecting the battery's conductivity, safety, and lifespan.

[0003] During the manufacturing and welding process of cylindrical lithium battery cells, the positive and negative electrode tabs need to be welded to the current collector and the shell respectively. However, the thickness of the aluminum positive electrode tab required for cell welding is usually 0.1mm to 0.3mm, with a tolerance of ±0.01mm, and the thickness of the nickel negative electrode tab required is usually 0.05mm to 0.2mm, with a tolerance of ±0.005mm to 0.01mm. This makes the positive and negative electrode tabs prone to local unevenness or continuous wavy shapes during the production, cutting and transportation process due to the extremely thin characteristics of the material. Unevenness may lead to uneven welding pressure or penetration risk in subsequent welding. At the same time, when the surface roughness of the tab does not meet the standard, the vibration energy may not be effectively transmitted in the subsequent ultrasonic welding, and the light spot scattering in the laser welding may cause the molten pool to be unstable, affecting the overall welding quality of lithium battery manufacturing. In addition, during the feeding and conveying process of the positive and negative tabs of the current lithium battery, the operator needs to identify and feed the tabs according to the front and back sides, which affects the feeding speed and reduces the overall production efficiency. Therefore, a feeding detection equipment for lithium battery cell manufacturing welding is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a material feeding detection device for welding in the manufacture of lithium battery cells.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A feeding detection device for lithium battery cell manufacturing welding includes a directional detection box and two feeding channels. The upper and lower end surfaces of the directional detection box are respectively connected to a feeding seat and a feeding seat. Two correction components for detecting the flatness of uneven tabs are arranged between the feeding seat and the feeding seat. The inner wall of the directional detection box is connected to two symmetrically arranged electric control rails, the inner wall of the electric control guide rails is connected to three directional slides, the directional slide is connected to a docking assembly through a steering seat, and a pole ear limiting disk is provided on the docking assembly, and a limiting hole is provided on the axis of the pole ear limiting disk, and an axis limiting block is slidably connected to the inner wall of the limiting hole, a directional detection groove is provided on the top of the pole ear limiting disk, and the inner end face of the directional detection groove is connected to multiple rows of guide magnetic plates arranged in a circular array, a continuous pressure measurement assembly for detecting the wave fluctuation of the pole ear is provided between two adjacent rows of the guide magnetic plates, and a point detection assembly for detecting the local unevenness of the pole ear is provided between multiple guide magnetic plates in a single row, and the left and right inner walls of the directional detection box are connected to optical measurement assemblies.

[0006] Preferably, the top and bottom ends of the directional detection box are fixedly connected to the feeding seat and the feeding seat respectively, the top and bottom ends of the feeding seat are fixedly connected to the two feeding channels respectively and communicate with each other, and the outer side walls of the feeding channels are fixedly connected with multiple electromagnetic guide rings arranged at equal distances.

[0007] Preferably, the correction component includes a correction pressure plate arranged at the bottom of the feeding seat and a pressure-bearing semicircular plate arranged at the bottom of the feeding seat. The feeding seat is fixedly connected to the correction pressure plate through an electric push rod. Two mutually symmetrical return holes are provided on the feeding seat. The feeding seat is fixedly connected to the two pressure-bearing semicircular plates through two electric push rods respectively. The pressure-bearing semicircular plates are located at the bottom of the return hole.

[0008] Preferably, the docking assembly includes a docking magnetic ring, the inner side wall of the directional detection box is slidably connected to the directional slide through an electrically controlled guide rail, the directional slide is rotatably connected to a hydraulic push rod through a steering seat, the output end of the hydraulic push rod is fixedly connected to the docking magnetic ring, and the bottom end of the pole ear limiting disk is fixedly connected to a docking magnetic column that is compatible with the docking magnetic ring.

[0009] Preferably, the bottom end of the tab limiting disk is fixedly connected to a control motor through a mounting seat, the output end of the control motor is fixedly connected to the axis limiting block through a hydraulic limiting rod, a pressure sensor is provided in the hydraulic limiting rod, and the top end of the tab limiting disk is fixedly connected to a plurality of limiting arc plates.

[0010] Preferably, two micro air pumps are fixedly connected to the bottom end of the tab limiting disk, the output end of the micro air pump is connected to the directional detection groove on the tab limiting disk, and the multiple guide magnetic plates in a single row are arranged at equal intervals with gradually increasing distances from the axis to the edge.

[0011] Preferably, the continuous pressure measurement assembly consists of multiple continuous pressure-bearing telescopic rods and multiple continuous measurement plates. The inner end surface of the directional detection groove on the tab limiting disk is fixedly connected to the continuous measurement plate through the continuous pressure-bearing telescopic rod. The multiple continuous measurement plates are arranged in a circular array, and multiple adsorption holes are provided on the continuous measurement plate.

[0012] Preferably, the point detection assembly consists of a plurality of point pressure-bearing telescopic rods and a plurality of point measurement plates, and the inner end surface of the directional detection groove on the tab limiting disk is fixedly connected to the point measurement plate through the point pressure-bearing telescopic rod.

[0013] Preferably, the optical measurement component consists of multiple lasers and multiple arc-shaped photosensitive plates. The inner side wall of the directional detection box is fixedly connected with a vertical seat. The ends of the vertical seat are respectively fixedly connected to the multiple lasers and multiple photosensitive plates. The multiple lasers and multiple photosensitive plates are symmetrically arranged.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This solution uses the setting of the guide magnetic plate and the axis limiting block to utilize the magnetic response characteristics of the nickel-plated layer (welding surface) of the negative pole tab, combined with negative pressure adsorption, to automatically distinguish the front and back sides. Through the pressure feedback when the axis limiting block is pressed, the axis protrusion of the positive pole tab (non-welding surface feature) is identified to achieve locking and differentiation of the front and back sides.

[0015] 2. This solution uses a continuous pressure measurement component and a point detection component to detect the wavy and uneven shape of the tab using a continuous measurement plate, covering a wide range of deformation. It also uses a point measurement plate to identify local unevenness and capture tiny defects. At the same time, it analyzes the surface roughness of the tab through multi-angle laser reflection to ensure that the weld surface finish meets the standards.

[0016] 3. Through the setting of the correction component, this solution can re-test the unqualified tabs after hot pressing on the correction plate, improve the flatness of the unqualified tabs, reduce raw material waste, and automatically return the repaired tabs to the feed channel to avoid manual rework and improve production line utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of a material feeding and detection device for lithium battery cell manufacturing welding proposed by the present invention; Figure 2 This is an assembly diagram of a material feeding and detection device for manufacturing and welding lithium battery cells proposed by the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic structural diagram of a deviation correction component in a feeding detection device for lithium battery cell manufacturing welding proposed by the present invention; Figure 5 This is a schematic diagram of the structure inside the directional detection box of a feeding detection device for lithium battery cell manufacturing welding proposed by the present invention; Figure 6 This is a structural schematic diagram of the position of the tab limiting plate in a feeding detection device for lithium battery cell manufacturing welding proposed by the present invention; Figure 7 This is a structural schematic diagram of a guide magnetic plate in a feeding and detection device for lithium battery cell manufacturing welding proposed by the present invention; Figure 8 This is a structural schematic diagram of a continuous pressure measurement component in a feeding detection device for lithium battery cell manufacturing welding proposed by the present invention.

[0018] In the figure: 1. Directional detection box; 2. Feeding channel; 3. Electromagnetic guide ring; 4. Feeding seat; 5. Feeding seat; 6. Electric push rod; 7. Correction pressure plate; 8. Electric control push rod; 9. Pressure-bearing semicircular plate; 10. Electric control guide rail; 11. Directional slide; 12. Steering seat; 13. Hydraulic push rod; 14. Docking magnetic ring; 15. Tab limiting disk; 16. Docking magnetic column; 17. Limit arc plate; 18. Control motor; 19. Hydraulic limiting rod; 20. Axis limiting block; 21. Micro air pump; 22. Continuous pressure-bearing telescopic rod; 23. Continuous measuring plate; 24. Point pressure-bearing telescopic rod; 25. Point measuring plate; 26. Guide magnetic plate; 27. Vertical seat; 28. Laser; 29. ​​Photosensitive plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0022] Example, see Figures 1 to 8 A feeding detection device for lithium battery cell manufacturing welding includes a directional detection box 1 and two feeding channels 2. The upper and lower ends of the directional detection box 1 are respectively connected to a feeding seat 4 and a feeding seat 5. Two correction components for detecting the flatness of uneven tabs are arranged between the feeding seat 4 and the feeding seat 5. The outer end of the feeding channel 2 is provided with a buffer limit structure for buffering and stopping when the tab limiting plate 15 is transported to the end; Furthermore, the top and bottom ends of the directional detection box 1 are fixedly connected to the feeding seat 4 and the feeding seat 5 respectively, the top end of the feeding seat 4 and the bottom end of the feeding seat 5 are fixedly connected to the two feeding channels 2 and communicate with each other, the outer side wall of the feeding channel 2 is fixedly connected with a plurality of electromagnetic guide rings 3 arranged at equal distances, the correction component includes a correction pressure plate 7 arranged at the bottom of the feeding seat 4 and a pressure-bearing semicircular plate 9 arranged at the bottom of the feeding seat 5, the feeding seat 4 is fixedly connected to the correction pressure plate 7 through an electric push rod 6, and two mutually symmetrical return holes are provided on the feeding seat 5, and the feeding seat 5 is fixedly connected to the two pressure-bearing semicircular plates 9 through two electric-controlled push rods 8, and the pressure-bearing semicircular plate 9 is located at the bottom of the return hole; It should be noted that: the tabs to be welded are placed on a positionable conveyor belt for transportation, and the tabs are stopped after being transported to the designated position. The outside of the directional detection box 1 is connected by a rotating mechanism, and the orientation of the two feeding channels 2 can be adjusted as needed so that the feeding channel 2 port on the feeding seat 4 is facing the tab to be welded. Then, multiple electromagnetic guide rings 3 with gradually increasing spacing from the feeding seat 4 are energized (that is, the spacing of the electromagnetic guide rings 3 energized near one end of the directional detection box 1 is the smallest, and the spacing of other energized electromagnetic guide rings 3 increases successively, and the circuit on and off of multiple electromagnetic guide rings 3 is independently controlled). Multiple energized electromagnetic guide rings 3 eventually form a total magnetic field, and the magnetic field of this total magnetic field at the center position of the electromagnetic guide ring 3 follows the principle of vector addition, and a magnetic field superimposed outward from the feeding seat 4 will be formed. The tab limiting disk 15 is made of steel, and the tab limiting disk 15 is affected by the superimposed magnetic field and moves outward to the outward end of the feeding channel 2 and stops. Then, the micro air pump 21 is controlled to allow the tab limiting disk 15 to In a negative pressure state, the tabs on the conveyor belt are adsorbed and limited (if the tab to be fed is a negative tab, negative pressure adsorption is not required first, and the guide magnetic plate 26 on the tab limiting disk 15 is used for magnetic attraction. If the negative tab can be attracted, it means that the adsorption surface is the positive nickel layer, otherwise it is the reverse graphite coating, which is used to determine the positive and negative sides of the negative tab. The positive side here refers to the welding side, and the reverse side refers to the non-welding side, which will not be described later). Then, the multiple electric switches 2 on the feeding channel 2 on the feeding seat 4 are controlled to increase the spacing from the outside to the inside. The magnetic guide rings 3 are energized (i.e., the spacing between the electromagnetic guide rings 3 that are energized near one end of the directional detection box 1 is the largest, and the spacing between the other energized electromagnetic guide rings 3 decreases in sequence). The above-mentioned magnetic acceleration principle is used to guide the tab limiting disk 15 to move in the direction of the directional detection box 1 in the feeding channel 2. It should be noted that the sliding of the tab limiting disk 15 in the feeding channel 2 is a limited sliding and will not deflect. The tab limiting disk 15 limits the conveying of the tabs to prevent the thin tabs from tilting and deflecting during the conveying process. After the inspection is completed, the qualified pole ears will be pushed into the feeding channel 2 on the feeding seat 5, and the multiple electromagnetic guide rings 3 will be energized accordingly using the principle of magnetic acceleration mentioned above, and the pole ear limiting disk 15 with the qualified pole ears will be pushed to the outer port of the feeding channel 2, and then the pole ears will be sucked and moved to the welding station by the mechanical arm suction cup for subsequent welding process, wherein the unqualified pole ears will be moved to the return test hole on the feeding seat 5, and the pole ears will be placed on the two pressure-bearing semicircular plates 9 outside the return test hole, and then the electric push rod 6 will be started to press the correction pressure plate 7 on the pole ears on the pressure semicircular plates 9, and the unqualified pole ears will be hot-pressed (the correction pressure plate 7 can be standardized according to the size and structural characteristics of the feeding pole ears). After a period of hot pressing, the electric control push rod 8 will be used to separate the two pressure-bearing semicircular plates 9, allowing the pole ears with improved surface flatness to re-enter the conveying channel, and then repeated inspections will be carried out. After passing the test, they will enter the feeding channel 2 in the welding direction; The above advantages are as follows: in this way, the surface of the unqualified tab can be hot-pressed by the correction pressure plate 7 to improve the flatness of the tab surface, so that the adjusted tab can be re-entered into the feeding channel, thereby ensuring efficient use of raw materials and avoiding the complicated rework operation required after the tab is discovered. The inner wall of the directional detection box 1 is connected to two electrically controlled guide rails 10 arranged symmetrically with each other, and the inner wall of the electrically controlled guide rail 10 is connected to three directional slides 11. The directional slide 11 is connected to a docking assembly through a steering seat 12. The docking assembly is provided with a tab limiting disk 15. The tab limiting disk 15 has a limiting hole at its axis, and an axis limiting block 20 is slidably connected to the inner wall of the limiting hole. A directional detection groove is provided at the top of the tab limiting disk 15, and the inner end surface of the directional detection groove is connected to multiple rows of guide magnetic plates 26 arranged in a circular array; Furthermore, the docking assembly includes a docking magnetic ring 14, the inner wall of the directional detection box 1 is slidably connected to the directional slide 11 through an electric control guide rail 10, the directional slide 11 is rotatably connected to the hydraulic push rod 13 through the steering seat 12, the output end of the hydraulic push rod 13 is fixedly connected to the docking magnetic ring 14, the bottom end of the pole ear limiting disk 15 is fixedly connected to the docking magnetic column 16 adapted to the docking magnetic ring 14, the bottom end of the pole ear limiting disk 15 is fixedly connected to the control motor 18 through the mounting seat, the output end of the control motor 18 is fixedly connected to the axis limiting block 20 through the hydraulic limiting rod 19, a pressure sensor is arranged in the hydraulic limiting rod 19, a plurality of limiting arc plates 17 are fixedly connected to the top of the pole ear limiting disk 15, two micro air pumps 21 are fixedly connected to the bottom end of the pole ear limiting disk 15, the output end of the micro air pump 21 is communicated with the directional detection slot on the pole ear limiting disk 15, and a single row of multiple guide magnetic plates 26 are arranged at equal intervals with gradually increasing distances from the axis to the edge; It should be noted that: the hydraulic push rod 13 on the directional slide 11 pushes the docking magnetic ring 14 toward the feeding channel 2, so that the docking magnetic ring 14 and the docking magnetic column 16 on the tab limiting disk 15 dock with each other and limit the position, and then the hydraulic push rod 13 is controlled to retract, and then the steering seat 12 is used to rotate the tab limiting disk 15 90° to a vertical state, and then the directional slide 11 is controlled to slide in the electric control guide rail 10 to allow the two adjacent tab limiting disks 15 to dock (the limiting arc plates 17 on the two adjacent tab limiting disks 15 are staggered and will not cause docking obstruction), and then the two hydraulic limiting rods 19 respectively push the two axis limiting blocks 20 to press and limit the axis parts at both ends of the tab (the axis limiting block 20 is made of rubber. When the positive pole tab is pressed, the positive pole tab is adapted to the battery compartment structure. Usually, the front side is flat, and there will be a convex column at the axis on the back side. According to the pressure applied to the two hydraulic limiting rods 19 during the extrusion process, it can be determined which side is the welding surface of the positive pole tab); The benefits of the above are as follows: in this way, the front and back sides of the negative electrode tab can be determined by utilizing the adsorption and limiting process, and the front and back sides of the positive electrode tab can be determined during the compression and limiting process before testing, so that the positive and negative tabs can be self-locked on the front and back sides before welding testing, which is convenient for subsequent feeding to the welding station, providing the non-welding surface to be sucked by the robot arm suction cup, making subsequent welding more efficient and orderly; A continuous pressure measurement component for detecting the undulation of the tab is provided between two adjacent rows of guide magnetic plates 26. A point detection component for detecting the local unevenness of the tab is provided between multiple guide magnetic plates 26 in a single row. The left and right inner walls of the directional detection box 1 are both connected to optical measurement components. Among them, the guide magnetic plate 26 is a strong magnetic NdFeB magnet, which can generate magnetic attraction to the nickel layer of the negative pole tab; Furthermore, the continuous pressure measurement component is composed of a plurality of continuous pressure-bearing telescopic rods 22 and a plurality of continuous measurement plates 23. The inner end surface of the directional detection groove on the tab limiting disk 15 is fixedly connected to the continuous measurement plate 23 through the continuous pressure-bearing telescopic rod 22. The plurality of continuous measurement plates 23 are arranged in a circular array. The continuous measurement plate 23 is provided with a plurality of adsorption holes. The point detection component is composed of a plurality of point pressure-bearing telescopic rods 24 and a plurality of point measurement plates 25. The inner end surface of the directional detection groove on the tab limiting disk 15 is fixedly connected to the point measurement plate 25 through the point pressure-bearing telescopic rod 24. The optical measurement component is composed of a plurality of lasers 28 and a plurality of arc-shaped photosensitive plates 29. The inner side wall of the directional detection box 1 is fixedly connected with a vertical seat 27. The ends of the vertical seat 27 are respectively fixedly connected to the plurality of lasers 28 and the plurality of photosensitive plates 29. The plurality of lasers 28 and the plurality of photosensitive plates 29 are symmetrically arranged. It should be noted that: after the front and back axes of the tab are limited by the two axis limiting blocks 20, the two control motors 18 are started synchronously to drive the axis limiting blocks 20 to rotate, and the compressed tab will rotate together with the axis limiting blocks 20. During the rotation of the tab, its two sides will respectively contact the continuous measuring plate 23 and the point measuring plate 25 on the two tab limiting disks 15. If the tab has wavy unevenness, the tab will produce intermittent squeezing with the continuous measuring plate 23 with a larger area during the rotation. The continuous measuring plate 23 with a large area can monitor the wavy unevenness as a whole, so that the pressure can be transmitted to the continuous pressure-bearing telescopic rod 22. If the tab has local unevenness, the local uneven area will be squeezed during the rotation of the tab. The domain will contact the point measuring plate 25. The small area feature of the point measuring plate 25 makes the extrusion caused by the local unevenness more concentrated and obvious, which is convenient for the point pressure-bearing telescopic rod 24 to receive the extrusion effect. The above all illustrate that the flatness of this type of tab is insufficient, which affects the subsequent welding quality and the conductive performance during use. The negative pressure state on the two tab limiting plates 15 can be adjusted as needed later, so that the edge tab limiting plate 15 adsorbs the tab, and the tab to be measured is rotated to the side facing the vertical seat 27. The laser 28 on the vertical seat 27 emits light beams at different angles. The light beams are reflected by the mirror surface of the tab to the photosensitive plate 29. The photoelectric sensor in the photosensitive plate 29 senses the position and intensity of the light beam landing point, and uses this to judge whether the surface finish of the tab meets the standard. The above advantages are as follows: in the process of the tab being driven to rotate by the axis limiting block 20, the continuous measuring plate 23 and the point measuring plate 25 can be used to respectively detect whether there are wavy undulations and local unevenness on the tab surface, so as to ensure that the flatness of the tab to be welded meets the standard, and then the situation of the laser 28 emitting a light beam on the tab surface can be used to judge whether the surface finish of the tab meets the standard, so as to ensure that the tab used for welding is qualified; When the present invention is in use, the tabs to be welded are placed on a positionable conveyor belt for conveyance, and the tabs are stopped after being conveyed to the designated position. The directional detection box 1 is connected to the outside by a rotating mechanism, and the orientations of the two feeding channels 2 can be adjusted as needed, so that the feeding channel 2 ports on the feeding seat 4 are facing the tabs to be welded. Subsequently, multiple electromagnetic guide rings 3 with gradually increasing spacing from the feeding seat 4 to the outside are energized (that is, the spacing of the electromagnetic guide rings 3 energized on one end of the directional detection box 1 is the smallest, and the spacing of other energized electromagnetic guide rings 3 increases in sequence, and the circuit switching of multiple electromagnetic guide rings 3 is independently controlled). The multiple energized electromagnetic guide rings 3 eventually form a total magnetic field, and the magnetic field at the center position of the total magnetic field follows the principle of vector addition, which will form A magnetic field superimposed outward from the feeding seat 4 is formed. The tab limiting disk 15 is made of steel. The tab limiting disk 15 is affected by the superimposed magnetic field and moves outward to the outward end of the feeding channel 2 and stops. Then the micro air pump 21 is controlled to make the tab limiting disk 15 in a negative pressure state, and the tab on the conveyor belt is adsorbed and limited (if the tab to be fed is a negative tab, negative pressure adsorption is not required first, and the guide magnetic plate 26 on the tab limiting disk 15 is used for magnetic attraction. If the negative tab can be attracted, it means that the adsorption surface is the positive nickel layer, otherwise it is the reverse graphite coating, which is used to determine the front and back of the negative tab. The front here refers to the welding surface, and the reverse refers to the non-welding surface, which will not be repeated later). Then, the multiple electric poles with gradually increasing spacing from the outside to the inside of the feeding channel 2 on the feeding seat 4 are controlled by changing. The magnetic guide ring 3 is energized (that is, the spacing between the electromagnetic guide rings 3 that are energized on one end of the directional detection box 1 is the largest, and the spacing between the other energized electromagnetic guide rings 3 decreases in sequence). The above-mentioned magnetic acceleration principle is used to guide the tab limiting disk 15 to move toward the directional detection box 1 in the feeding channel 2. It should be noted that the sliding of the tab limiting disk 15 in the feeding channel 2 is a limited sliding and will not deflect. The tab limiting disk 15 limits the conveying of the tab to prevent the thin-sheet tab from tilting and deflecting during the conveying process. Before this, the hydraulic push rod 13 on the directional slide 11 pushes the docking magnetic ring 14 toward the feeding channel 2, so that the docking magnetic ring 14 and the docking magnetic column 16 on the tab limiting disk 15 dock with each other and limit the position. Then the hydraulic push rod 13 is controlled to retract, and then the tab limiting disk 15 is used. The steering seat 12 rotates the tab limiting disk 15 90 degrees to a vertical state, and then controls the directional slide 11 to slide in the electric control guide rail 10, so that the two adjacent tab limiting disks 15 are docked (the limiting arc plates 17 on the two adjacent tab limiting disks 15 are staggered and will not cause docking obstacles). Then the two hydraulic limiting rods 19 push the two axis limiting blocks 20 respectively to press and limit the axis parts at both ends of the tab (the axis limiting blocks 20 are made of rubber. When the positive tab is pressed, the positive tab is adapted to the battery compartment structure. Usually, the front side is flat, and there will be a convex column at the axis on the back side. According to the pressure applied to the two hydraulic limiting rods 19 during the extrusion process, it can be determined which side is the welding surface of the positive tab). In this way, the adsorption limiting process can be utilized.Determine the front and back sides of the negative electrode tab. During the pressing and limiting process before testing, determine the front and back sides of the positive electrode tab, so that the positive and negative tabs can be self-locked before welding testing. This facilitates the subsequent feeding of materials to the welding station, providing the non-welding surface for the robot arm suction cup to be sucked (this is an existing technical means and will not be described in detail), making subsequent welding more efficient and orderly; After the axis of the front and back sides of the pole ear is limited by the two axis limiting blocks 20, the two control motors 18 are started synchronously to drive the axis limiting blocks 20 to rotate, and the compressed pole ear will rotate together with the axis limiting blocks 20. During the rotation of the pole ear, its two sides will respectively contact the continuous measuring plate 23 and the point measuring plate 25 on the two pole ear limiting disks 15. If the pole ear has wavy unevenness, the pole ear will produce intermittent extrusion with the continuous measuring plate 23 with a larger area during the rotation. The large-area continuous measuring plate 23 can monitor the wavy unevenness as a whole, so that the pressure is transmitted to the continuous pressure-bearing telescopic rod 22. If the pole ear has local unevenness, the local uneven area will contact the point measuring plate 25 during the rotation of the pole ear. The small area feature of the point measuring plate 25 makes the extrusion caused by the local unevenness more concentrated and obvious, which is convenient for the point pressure-bearing telescopic rod 24 to receive the extrusion effect. The above all illustrate that this type of pole The flatness of the ear is not enough, which affects the subsequent welding quality and the conductive performance during use. The negative pressure state on the two ear limiting plates 15 can be adjusted as needed later, so that the edge ear limiting plate 15 can adsorb the ear, and the ear to be measured surface is rotated to the side facing the vertical seat 27, and the laser 28 on the vertical seat 27 emits light beams at different angles. The light beams are reflected by the mirror surface of the ear to the photosensitive plate 29, and the photoelectric sensor in the photosensitive plate 29 senses the position and intensity of the light beam landing point, and thereby determines whether the surface finish of the ear meets the standard. In this way, the axis limiting block 20 can be used to drive the ear to rotate, and the continuous measuring plate 23 and the point measuring plate 25 can be used to respectively detect whether there are wavy undulations and local unevenness on the ear surface to ensure that the flatness of the ear to be welded meets the standard. Then, the laser 28 emits a light beam on the ear surface to determine whether the surface finish of the ear meets the standard, and ensure that the ear used for welding is qualified. After the inspection is completed, the qualified pole ears will be pushed into the feeding channel 2 on the feeding seat 5, and the multiple electromagnetic guide rings 3 will be energized accordingly using the principle of magnetic acceleration mentioned above, and the pole ear limiting disk 15 with the qualified pole ears will be pushed to the outer port of the feeding channel 2, and then the pole ears will be sucked and moved to the welding station by the robot arm suction cup for subsequent welding process, wherein the unqualified pole ears will be moved to the return test hole on the feeding seat 5, and the pole ears will be placed on the two pressure-bearing semicircular plates 9 outside the return test hole, and then the electric push rod 6 will be started to press the correction pressure plate 7 on the pole ears on the pressure-bearing semicircular plates 9, and the unqualified pole ears will be detected. Hot pressing is performed (the correcting pressure plate 7 can be standardized according to the size and structural characteristics of the feeding tabs). After a period of hot pressing, the two pressure-bearing semicircular plates 9 are separated by the electric push rod 8 to allow the tabs with improved surface flatness to re-enter the conveying channel, and then undergo repeated inspections. After passing the inspection, the tabs enter the feeding channel 2 in the welding direction. In this way, the correcting pressure plate 7 can be used to hot press the surface of the tabs that fail the inspection to improve the flatness of the tab surface, making it easier for the adjusted tabs to re-enter the conveying feeding channel, thereby ensuring efficient use of raw materials and avoiding the complicated rework operations required after the tabs are discovered later.

[0023] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A feeding detection device for welding in the manufacture of lithium battery cells, comprising a directional detection box (1) and two feeding channels (2), characterized in that: The upper and lower end surfaces of the directional detection box (1) are respectively connected to a feeding seat (4) and a feeding seat (5), and two correction components for detecting the flatness of uneven tabs are provided between the feeding seat (4) and the feeding seat (5); The inner wall of the directional detection box (1) is connected to two mutually symmetrically arranged electric control guide rails (10), the inner wall of the electric control guide rail (10) is connected to three directional slides (11), the directional slide (11) is connected to a docking assembly through a steering seat (12), and a pole ear limiting disk (15) is provided on the docking assembly, the pole ear limiting disk (15) has a limiting hole at its axis, and an axis limiting block (20) is slidably connected to the inner wall of the limiting hole, a directional detection groove is provided at the top of the pole ear limiting disk (15), and the inner end surface of the directional detection groove is connected to multiple rows of guide magnetic plates (26) arranged in a circular array, a continuous pressure measurement assembly for detecting the undulation of the pole ear is provided between two adjacent rows of the guide magnetic plates (26), and a point detection assembly for detecting the local unevenness of the pole ear is provided between multiple guide magnetic plates (26) in a single row, and the left and right inner walls of the directional detection box (1) are both connected to optical measurement assemblies.

2. A lithium battery cell manufacturing welding feeding detection equipment according to claim 1, characterized in that: The top and bottom ends of the directional detection box (1) are fixedly connected to the feeding seat (4) and the feeding seat (5), respectively. The top end of the feeding seat (4) and the bottom end of the feeding seat (5) are fixedly connected to two feeding channels (2) and communicate with each other, and the outer side walls of the feeding channels (2) are fixedly connected to a plurality of electromagnetic guide rings (3) arranged at equal distances.

3. A lithium battery cell manufacturing welding feeding detection equipment according to claim 1, characterized in that: The correction component includes a correction pressure plate (7) arranged at the bottom of the feeding seat (4) and a pressure-bearing semicircular plate (9) arranged at the bottom of the feeding seat (5); the feeding seat (4) is fixedly connected to the correction pressure plate (7) through an electric push rod (6); two mutually symmetrical return holes are provided on the feeding seat (5); the feeding seat (5) is fixedly connected to the two pressure-bearing semicircular plates (9) through two electric push rods (8), and the pressure-bearing semicircular plates (9) are located at the bottom of the return holes.

4. A lithium battery cell manufacturing welding feeding detection equipment according to claim 1, characterized in that: The docking assembly includes a docking magnetic ring (14), the inner side wall of the directional detection box (1) is slidably connected to the directional slide (11) through an electric control guide rail (10), the directional slide (11) is rotatably connected to a hydraulic push rod (13) through a steering seat (12), the output end of the hydraulic push rod (13) is fixedly connected to the docking magnetic ring (14), and the bottom end of the pole ear limiting disk (15) is fixedly connected to a docking magnetic column (16) adapted to the docking magnetic ring (14).

5. The material feeding detection equipment for lithium battery cell manufacturing welding according to claim 1, characterized in that: The bottom end of the tab limiting disk (15) is fixedly connected to a control motor (18) via a mounting seat, and the output end of the control motor (18) is fixedly connected to an axis limiting block (20) via a hydraulic limiting rod (19), wherein a pressure sensor is provided in the hydraulic limiting rod (19), and a plurality of limiting arc plates (17) are fixedly connected to the top end of the tab limiting disk (15).

6. A lithium battery cell manufacturing welding feeding detection equipment according to claim 1, characterized in that: Two micro air pumps (21) are fixedly connected to the bottom end of the tab limiting disk (15), and the output end of the micro air pump (21) is communicated with the directional detection slot on the tab limiting disk (15). The plurality of guide magnetic plates (26) in a single row are arranged at equal intervals with gradually increasing spacing from the axis to the edge.

7. The material feeding detection equipment for lithium battery cell manufacturing welding according to claim 1, characterized in that: The continuous pressure measurement assembly is composed of a plurality of continuous pressure-bearing telescopic rods (22) and a plurality of continuous measurement plates (23); the inner end surface of the directional detection groove on the tab limiting plate (15) is fixedly connected to the continuous measurement plate (23) via the continuous pressure-bearing telescopic rod (22); the plurality of continuous measurement plates (23) are arranged in a circular array, and a plurality of adsorption holes are provided on the continuous measurement plate (23).

8. The material feeding detection equipment for lithium battery cell manufacturing welding according to claim 1, characterized in that: The point detection assembly is composed of a plurality of point pressure-bearing telescopic rods (24) and a plurality of point measurement plates (25), and the inner end surface of the directional detection groove on the tab limiting plate (15) is fixedly connected to the point measurement plate (25) via the point pressure-bearing telescopic rods (24).

9. The material feeding detection equipment for lithium battery cell manufacturing welding according to claim 1, characterized in that: The optical measurement assembly is composed of a plurality of lasers (28) and a plurality of arc-shaped photosensitive plates (29). The inner side wall of the directional detection box (1) is fixedly connected to a vertical seat (27). The ends of the vertical seat (27) are respectively fixedly connected to the plurality of lasers (28) and the plurality of photosensitive plates (29). The plurality of lasers (28) and the plurality of photosensitive plates (29) are symmetrically arranged.

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