A main grid-free battery connection device with connection stability detection function

Abstract

The present invention discloses a main grid-free battery connection device with a connection stability detection function, which belongs to the technical field of photovoltaic battery production. The present invention includes a bottom bracket, on which a wire feeding box, a material box, and a welding box are installed. The wire feeding box and the welding box are respectively connected to the two sides of the material box. A raw material shaft and a wire feeding mechanism are arranged inside the wire feeding box. A low-temperature welding wire is arranged on the wire feeding raw material shaft. A plurality of battery sheets are arranged on the upper part of the material box. Four variable pitch rotary rods are arranged inside the material box. Two welding gun heads and a detection mechanism are symmetrically arranged in the upper and lower parts of the welding box. A group of guide rollers are respectively arranged at the left and right ends of the two welding gun heads. The control system is used to analyze the on-off condition of the circuit in the detection mechanism. If the circuit conduction and disconnection cycles are uneven, it means that a thin grid line has failed to be successfully welded with the low-melting point metal wire, thereby realizing automatic detection of the connection stability.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic cell production, and in particular to a main-grid-free cell connection device with a connection stability detection function. Background Art

[0002] The global fossil energy crisis and environmental pollution have promoted the rapid development of the photovoltaic industry. Power generation components based on crystalline silicon cells account for more than 80% of the global photovoltaic component market. The silicon material in crystalline silicon cells accounts for about 60% to 70% of the material cost, and the amount of silver paste accounts for about 20% to 30% of the material cost. The emergence of busbar-free technology has become the most successful improvement in reducing costs. The busbar plays the role of carrying electrons for convergence. Busbar-free does not mean no convergence, but that the busbar is not laminated when the photovoltaic cells are laminated, thereby reducing silver. The purpose of using slurry is to use mature technologies such as welding instead, to press the low-melting-point metal wire onto the fine grid line to connect the front and back electrodes of the two solar cells in series, which plays a role in current convergence. Because the width of the metal wire is smaller than the width of the main grid line, this technology also helps to increase the effective illumination area of ​​the solar cell and increase the power generation. In the existing production of main grid-free solar cells, hot glue is used to encapsulate the low-melting-point metal wire, so that the low-melting-point metal wire and the fine grid line are connected together, but the reliability of the connection still needs to be manually tested, which is prone to quality problems and the efficiency is very low. Summary of the invention

[0003] The object of the present invention is to provide a busbar-free battery connection device with a connection stability detection function to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a main grid-free battery connection device with a connection stability detection function, comprising a bottom bracket, on which a wire feeding box, a material discharge box and a welding box are installed, the wire feeding box and the welding box are respectively connected to both sides of the material discharge box, a raw material shaft and a wire feeding mechanism are arranged inside the wire feeding box, a low-temperature welding wire is arranged on the wire feeding raw material shaft, a plurality of battery cells are arranged on the upper part of the material discharge box, four variable pitch rotary rods are arranged inside the material discharge box, two welding gun heads and a detection mechanism are symmetrically arranged inside the welding box, and a group of guide rollers are respectively arranged at the left and right ends of the two welding gun heads.

[0005] Furthermore, an upper cutter and a lower cutter are symmetrically arranged at the middle part of the wire feeding box, and the upper cutter and the lower cutter are both slidably connected to the wire feeding box. The wire feeding mechanism includes a front roller group and a rear roller group, and the front roller group and the rear roller group are respectively arranged on both sides of the upper cutter and the lower cutter. The front roller group includes a front wire feeding roller and a front anti-slip roller, and the front anti-slip roller is located above the front wire feeding roller. The rear roller group includes a rear wire feeding roller and a rear anti-slip roller. The structure and setting method of the rear roller group are the same as those of the front roller group. Before welding the battery cell, the operator pulls the low-melting-point welding wire to the front roller The front wire feed roller is driven by the drive belt to rotate the driven wheel, and the driven wheel drives the rear wire feed roller to rotate. The driving wheel has the same diameter as the driven wheel, and the front wire feed roller and the rear wire feed roller have the same direction and speed. The front wire feed roller drives the front anti-slip roller to rotate through friction, and the rear wire feed roller drives the rear anti-slip roller to rotate through friction. Under the transmission of the front roller group and the rear roller group, the low melting point welding wire rises from the wire feeding box to the discharge box and extends to the surface of the battery cell.

[0006] Furthermore, a first motor is arranged on the outside of the wire feeding box, a driving wheel is installed at one end of the front wire feeding roller, a driven wheel is installed at one end of the rear wire feeding roller, the first motor is coaxially connected to the driving wheel, and a transmission belt is connected between the driving wheel and the driven wheel.

[0007] Furthermore, two crankshafts are rotatably arranged on the outer side of the wire feeding box, and a groove wheel is installed on each of the two crankshafts. A dial wheel is coaxially connected to the front anti-skid roller and the rear anti-skid roller, and the two dial wheels are respectively in contact with the two groove wheels. A connecting rod is rotatably installed on each of the crankshafts, one end of the connecting rod is rotatably connected to the upper tool, and one end of the other connecting rod is rotatably connected to the lower tool. Each rotation of the front anti-skid roller and the rear anti-skid roller will drive the dial wheel to rotate one circle, and the two dial wheels rotate one circle to rotate the groove wheel once. After the wire is fed out to a certain length, the thumbwheel drives the groove wheel to rotate one circle. Each rotation of the groove wheel drives the crankshaft to rotate one circle. The crankshaft drives the upper and lower cutters to slide in the wire feeding box through the connecting rod. Because the two groove wheels move synchronously, the upper and lower cutters also move at the same time to cut the low-melting-point metal wire. After the low-melting-point metal wire is cut, one end is still clamped on the front roller group. As the first motor continues to drive the front roller group and the rear roller group to move, the low-melting-point metal wire continues to be transmitted to the lower material box, ensuring the continuity and stability of the wire feeding, and realizing the function of quantitative cutting.

[0008] Furthermore, the four variable pitch rotary rods are rotatably installed in the discharge box, each of the variable pitch rotary rods is provided with a spiral groove, the pitch of the spiral groove gradually increases from top to bottom, the spiral grooves of the four variable pitch rotary rods have the same rotation direction, the top edge of each variable pitch rotary rod is in tangential contact with the battery cell, the servo motor is energized to drive the main friction wheel to rotate, and the main friction wheel drives the variable pitch rotary rod to rotate through the small friction wheel, and the spiral grooves on the top of the four variable pitch rotary rods contact the edge of the battery cell at the same time, as the variable pitch rotary rod rotates, the battery cell moves downward along the spiral groove on the variable pitch rotary rod, and all the variable pitch rotary rods bring down one battery cell for each rotation, and as the pitch of the spiral groove increases, the lower battery cell is pulled away from the upper battery cell to prevent two battery cells from falling from the variable pitch rotary rod into the discharge box together in a tightly pressed state.

[0009] Furthermore, a servo motor is arranged inside the material box, and a main friction wheel is connected to the motor shaft of the servo motor. The main friction wheel is located at the bottom of the material box, and a small friction wheel is connected to the bottom of each variable pitch rotary rod, and all the small friction wheels are in contact with the main friction wheel. When the first battery cell falling into the material box enters the welding box under the push of the bottom side of the variable pitch rotary rod, the next battery cell falls. At this time, one end of the low-melting-point metal wire is below the previous battery cell, and the next battery cell falls. The battery cell is then pressed on the remaining low-melting-point metal wire. Before welding, the front and back motors between the battery cells are positioned in series through the low-melting-point metal wire. Subsequently, a new section of the low-melting-point metal wire is sent to the top of the battery cell that has just fallen. As the battery cell enters the welding box, the low-melting-point metal wire is welded to the battery cell. The new battery cell continues to fall and is pressed on the cut low-melting-point metal wire. It is connected in series with the subsequent battery cells one after another, thus realizing the series positioning of the battery cell and the low-melting-point metal wire, and making preliminary preparations for the subsequent welding process.

[0010] Furthermore, a guide groove is provided on one side of the welding box close to the material discharge box, and a material trough is provided inside the welding box. Each group of the guide rollers includes a pair of pressure rollers, and each pair of pressure rollers is arranged at the upper and lower ends of the material trough. The surface of each pressure roller is provided with anti-slip material, and a small motor is installed on one side of each pressure roller. Each small motor is connected to the control system. When the battery cell and the low-melting-point metal wire enter the welding box, the low-melting-point metal wire pre-placed at the upper and lower ends of the battery cell fixes the welding position under the action of the guide groove, and the pressure roller presses the low-melting-point metal wire and the battery cell together and cannot move at will. The welding gun head welds the low-melting-point metal wire to the battery cell, so that the low-melting-point metal wire is connected to each fine grid line.

[0011] Furthermore, the detection mechanism is arranged at the upper end of the material trough, and the detection mechanism includes a conductive paddle and a conductive voltage wheel. The conductive paddle is made of elastic metal, and the conductive voltage wheel is in contact with the surface of the battery cell. The conductive paddle and the conductive voltage wheel in the detection mechanism are connected to the control system through the circuit. After welding is completed, driven by the pressure roller, the conductive paddle contacts and slides on the low-melting-point metal wire, and the conductive voltage wheel rolls on the battery cell. The conductive voltage wheel and the conductive paddle are connected in the same circuit. When the conductive voltage wheel contacts the fine grid line, the circuit connecting the conductive voltage wheel and the conductive paddle is connected. When the conductive voltage wheel rolls on the battery cell, the circuit is continuously turned on and off. Therefore, when the battery cell moves at a uniform speed, the circuit conduction and disconnection cycles are uniform. The control system analyzes the on-off status of the circuit in the detection mechanism. If the circuit conduction and disconnection cycles are uneven, it means that the fine grid line has failed to be successfully welded to the low-melting-point metal wire, and secondary welding is required at the problem position in the subsequent process, thereby realizing automatic detection of connection stability and avoiding the problem of low efficiency of manual detection.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0013] 1. The spiral grooves on the top of the four variable pitch rotating rods are used to contact the edge of the battery cell at the same time, so that the battery cell moves downward along the spiral groove and is unloaded in sequence. The pitch of the spiral groove increases to distance the battery cells, preventing two battery cells from falling from the variable pitch rotating rod into the unloading box together in a close-fitting state. When the low-melting-point metal wire is fed out to a certain length, the dial drives the groove wheel to rotate one circle, and the crankshaft drives the upper and lower cutters to slide in the wire feeding box through the connecting rod to cut the low-melting-point metal wire, ensuring the continuity and stability of wire feeding and realizing the function of quantitative cutting.

[0014] 2. The material box makes one end of the low-melting-point metal wire under the previous battery cell, and the next battery cell falls and presses on the remaining low-melting-point metal wire. Before welding, the front and back motors between the battery cells are positioned in series through the low-melting-point metal wire, the conductive paddle contacts the low-melting-point metal wire, the conductive voltage wheel rolls on the battery cell, and the circuit connected between the conductive voltage wheel and the conductive paddle is continuously turned on and off. The control system analyzes the on-off status of the circuit in the detection mechanism. If the circuit is turned on and off unevenly, it means that the fine grid wire has not been successfully welded to the low-melting-point metal wire, thereby realizing automatic detection of the stability of the connection and avoiding the problem of low efficiency of manual detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall appearance structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure inside the wire feeding box of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the material box part of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the variable pitch rotary rod of the present invention;

[0021] Figure 6 It is a schematic diagram of the internal structure of the welding box of the present invention;

[0022] Figure 7 It is a structural schematic diagram of the detection mechanism of the present invention;

[0023] In the figure: 1. wire feeding box; 2. raw material shaft; 301. front wire feeding roller; 302. front anti-skid roller; 401. rear wire feeding roller; 402. rear anti-skid roller; 501. first motor; 502. driving wheel; 503. driven wheel; 601. upper tool; 602. lower tool; 701. paddle wheel; 702. groove wheel; 703. crankshaft; 704. connecting rod; 8. unloading box; 9. battery cell; 10. variable pitch rotary rod; 11. small friction wheel; 12. main friction wheel; 13. welding box; 14. pressure roller; 15. welding gun head; 16. conductive paddle; 17. conductive voltage wheel. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 7The present invention provides a technical solution: a main grid-free battery connection device with a connection stability detection function, comprising a bottom bracket, a wire feeding box 1, a material box 8, and a welding box 13 are installed on the bottom bracket, the wire feeding box 1 and the welding box 13 are respectively connected to the two sides of the material box 8, a raw material shaft 2 and a wire feeding mechanism are arranged inside the wire feeding box 1, a low-temperature welding wire is arranged on the wire feeding raw material shaft 2, a plurality of battery cells 9 are arranged on the upper part of the material box 8, four variable pitch rotary rods 10 are arranged inside the material box 8, and the welding box 13 Two welding gun heads 15 and a detection mechanism are symmetrically arranged inside, and a group of guide rollers are respectively arranged at the left and right ends of the two welding gun heads 15. An upper cutter 601 and a lower cutter 602 are symmetrically arranged in the middle of the wire feeding box 1. The upper cutter 601 and the lower cutter 602 are both slidably connected to the wire feeding box 1. The wire feeding mechanism includes a front roller group and a rear roller group. The front roller group and the rear roller group are respectively arranged on both sides of the upper cutter 601 and the lower cutter 602. The front roller group includes a front wire feeding roller 301, a front anti-slip roller 302, and a front anti-slip roller 302 is located above the front wire feeding roller 301, and the rear roller group includes the rear wire feeding roller 401 and the rear anti-slip roller 402. The structure and setting method of the rear roller group are the same as those of the front roller group. Before welding the battery cell 9, the operator draws the low melting point welding wire to the front roller group, and at the same time, the four variable pitch rotating rods 10 rotate together to transfer the battery cell 9 to the unloading box 8. The first motor 501 is powered on, and the driving wheel 502 rotates while driving the front wire feeding roller 301 to rotate, and the transmission belt drives the battery cell 9 to rotate. The driven wheel 503 rotates, and the driven wheel 503 drives the rear wire feed roller 401 to rotate. The diameters of the driving wheel 502 and the driven wheel 503 are the same, and the direction and speed of the front wire feed roller 301 and the rear wire feed roller 401 are the same. The front wire feed roller 301 drives the front anti-slip roller 302 to rotate through friction, and the rear wire feed roller 401 drives the rear anti-slip roller 402 to rotate through friction. Under the transmission of the front roller group and the rear roller group, the low melting point welding wire rises from the wire feeding box 1 to the discharge box 8 and extends to the surface of the battery cell 9.

[0026] A first motor 501 is arranged on the outside of the wire feeding box 1, a driving wheel 502 is installed at one end of the front wire feeding roller 301 for wire feeding, and a driven wheel 503 is installed at one end of the rear wire feeding roller 401, the first motor 501 is coaxially connected with the driving wheel 502, and a transmission belt is connected between the driving wheel 502 and the driven wheel 503, and two crankshafts 703 are rotatably arranged on the outside of the wire feeding box 1, and a groove wheel 702 is installed on each of the two crankshafts 703, a dial wheel 701 is coaxially connected to the front anti-skid roller 302 and the rear anti-skid roller 402, and the two dial wheels 701 are respectively in contact with the two groove wheels 702, and a connecting rod 704 is rotatably installed on each crankshaft 703, one end of one connecting rod 704 is rotatably connected to the upper tool 601, and one end of the other connecting rod 704 is rotatably connected to the lower tool 602. Each rotation of the sliding roller 402 will drive the thumbwheel 701 to rotate one circle. Each rotation of the two thumbwheels 701 will drive the groove wheel 702 to rotate once. When the low-melting-point metal wire is fed out to a certain length, the thumbwheel 701 drives the groove wheel 702 to rotate one circle. Each rotation of the groove wheel 702 drives the crankshaft 703 to rotate one circle. The crankshaft 703 drives the upper tool 601 and the lower tool 602 to slide in the wire feeding box 1 through the connecting rod 704. Because the two groove wheels 702 move synchronously, the upper tool 601 and the lower tool 602 also move at the same time to cut the low-melting-point metal wire. After the low-melting-point metal wire is cut, one end is still clamped on the front roller group. As the first motor 501 continues to drive the front roller group and the rear roller group to move, the low-melting-point metal wire continues to be transmitted to the lower material box 8, ensuring the continuity and stability of the wire feeding, and realizing the function of quantitative cutting.

[0027] A servo motor is arranged inside the material box 8, and the motor shaft of the servo motor is connected to a main friction wheel 12, and the main friction wheel 12 is located at the bottom of the material box 8. A small friction wheel 11 is connected to the bottom of each variable pitch rotary rod 10, and all the small friction wheels 11 are in contact with the main friction wheel 12. The four variable pitch rotary rods 10 are rotatably installed in the material box 8, and a spiral groove is opened on each variable pitch rotary rod 10, and the pitch of the spiral groove gradually increases from top to bottom, and the spiral grooves of the four variable pitch rotary rods 10 have the same rotation direction. The top edge of each variable pitch rotary rod 10 is in tangential contact with the battery cell 9. The servo motor is powered on to drive the main friction wheel 12 to rotate. The main friction wheel 12 drives the variable pitch rotary rod 10 to rotate through the small friction wheel 11. The spiral grooves on the tops of the four variable pitch rotary rods 10 contact the edges of the battery cell 9 at the same time. As the variable pitch rotary rod 10 rotates, the battery cell 9 moves downward along the spiral grooves on the variable pitch rotary rod 10. Each time all the variable pitch rotary rods 10 rotate one circle, a battery cell 9 is brought down. As the spiral grooves rotate, the battery cell 9 moves downward along the spiral grooves on the variable pitch rotary rod 10. The pitch of the groove increases, and the lower battery cell 9 is spaced apart from the upper battery cell 9 to prevent the two battery cells 9 from falling from the variable pitch rotary rod 10 into the unloading box 8 together in a tightly pressed state. After the first battery cell 9 that falls into the unloading box 8 enters the welding box 13 under the push of the bottom side of the variable pitch rotary rod 10, the next battery cell 9 falls down. At this time, one end of the low-melting-point metal wire is below the previous battery cell 9. After the next battery cell 9 falls down, it is pressed on the top of the remaining low-melting-point metal wire. Before welding, the front and back motors between the battery cells 9 are positioned in series through low-melting-point metal wires, and then a new section of low-melting-point metal wire is sent to the top of the battery cell 9 that has just fallen. As the battery cell 9 enters the welding box 13, the low-melting-point metal wire is welded to the battery cell 9, and the new battery cell 9 continues to fall and presses on the cut low-melting-point metal wire, and is connected in series with the subsequent battery cells 9 one after another, thereby realizing the series positioning of the battery cell 9 and the low-melting-point metal wire, and making preliminary preparations for the subsequent welding process.

[0028] A guide groove is provided on one side of the welding box 13 close to the unloading box 8, and a material trough is provided inside the welding box 13. Each group of guide rollers includes a pair of pressure rollers 14, and each pair of pressure rollers 14 is arranged at the upper and lower ends of the material trough. The surface of each pressure roller 14 is provided with anti-slip material, and a small motor is installed on one side of each pressure roller 14, and each small motor is connected to the control system. The detection mechanism is arranged at the upper end of the material trough, and the detection mechanism includes a conductive paddle 16 and a conductive voltage wheel 17. The conductive paddle 16 is made of elastic metal, and the conductive voltage wheel 17 is in contact with the surface of the battery cell 9. The conductive paddle 16 and the conductive voltage wheel 17 in the detection mechanism are connected to the control system through a circuit. When the battery cell 9 and the low-melting-point metal wire enter the welding box 13, the low-melting-point metal wire pre-placed at the upper and lower ends of the battery cell 9 is fixed in the welding position under the action of the guide groove, and the pressure roller 14 presses the low-melting-point metal wire and the battery cell 9 together and cannot move at will. The welding gun head 15 presses the low-melting-point metal wire and the battery cell 9 together. The sheet 9 is welded so that the low-melting-point metal wire is connected to each fine grid line. After the welding is completed, driven by the pressure roller 14, the conductive pick 16 contacts the low-melting-point metal wire and slides on it, and the conductive voltage wheel 17 rolls on the battery sheet 9. The conductive voltage wheel 17 and the conductive pick 16 are connected in the same circuit. When the conductive voltage wheel 17 contacts the fine grid line, the circuit connected by the conductive voltage wheel 17 and the conductive pick 16 is connected. When the conductive voltage wheel 17 rolls on the battery sheet 9, the circuit is continuously turned on and off. Therefore, when the battery sheet 9 moves at a uniform speed, the circuit conduction and disconnection cycles are uniform. The control system analyzes the on-off status of the circuit in the detection mechanism. If the circuit conduction and disconnection cycles are uneven, it means that a fine grid line has not been successfully welded to the low-melting-point metal wire. In the subsequent process, it is necessary to perform secondary welding on the problem position, thereby realizing automatic detection of the stability of the connection and avoiding the problem of low efficiency of manual detection.

[0029] The working principle of the present invention is as follows: before welding the battery cell 9, the operator draws the low-melting-point welding wire onto the front roller group, and at the same time, the four variable-pitch rotary rods 10 rotate together to transfer the battery cell 9 to the discharge box 8. The first motor 501 is energized to work, and the driving wheel 502 rotates while driving the front wire feeding roller 301 to rotate, and drives the driven wheel 503 to rotate through the transmission belt, and the driven wheel 503 drives the rear wire feeding roller 401 to rotate. The driving wheel 502 has the same diameter as the driven wheel 503, and the front wire feeding roller 301 and the rear wire feeding roller 401 have the same direction and rotation speed. The front wire feeding roller 301 drives the front anti-skid roller 302 to rotate through friction, and the rear wire feeding roller 401 drives the rear anti-skid roller 402 to rotate through friction. Under the transmission of the front roller group and the rear roller group, the low-melting-point welding wire rises from the wire feeding box 1 to the discharge box 8 and extends to the surface of the battery cell 9.

[0030] When the front anti-skid roller 302 and the rear anti-skid roller 402 rotate one circle, the thumbwheel 701 rotates one circle. When the two thumbwheels 701 rotate one circle, the groove wheel 702 rotates once. When the low-melting-point metal wire is fed out to a certain length, the thumbwheel 701 rotates one circle to drive the groove wheel 702. When the groove wheel 702 rotates one circle, the crankshaft 703 rotates one circle. The crankshaft 703 drives the upper tool 601 and the lower tool 602 to slide in the wire feeding box 1 through the connecting rod 704. Because the two groove wheels 702 move synchronously, the upper tool 601 and the lower tool 602 also move at the same time to cut the low-melting-point metal wire. After the low-melting-point metal wire is cut, one end is still clamped on the front roller group. As the first motor 501 continues to drive the front roller group and the rear roller group to move, the low-melting-point metal wire continues to be transmitted to the lower material box 8, ensuring the continuity and stability of the wire feeding, and realizing the function of quantitative cutting.

[0031] The servo motor is powered on to drive the main friction wheel 12 to rotate, and the main friction wheel 12 drives the variable pitch rotary rod 10 to rotate through the small friction wheel 11. The spiral grooves on the top of the four variable pitch rotary rods 10 contact the edge of the battery cell 9 at the same time. As the variable pitch rotary rod 10 rotates, the battery cell 9 moves downward along the spiral grooves on the variable pitch rotary rod 10. Each time all the variable pitch rotary rods 10 rotate one circle, a battery cell 9 is brought down. As the pitch of the spiral groove increases, the lower battery cell 9 is pulled away from the upper battery cell 9 to prevent two battery cells 9 from falling from the variable pitch rotary rod 10 into the discharge box 8 in a close state. When the battery cell 9 that has fallen into the discharge box 8 enters the discharge box 8 under the push of the bottom side of the variable pitch rotary rod 10 After entering the welding box 13, the last battery cell 9 falls down. At this time, one end of the low-melting point metal wire is below the previous battery cell 9. After the last battery cell 9 falls down, it is pressed on the top of the remaining low-melting point metal wire. Before welding, the front and back motors between the battery cells 9 are positioned in series through the low-melting point metal wire, and then a new section of the low-melting point metal wire is sent to the top of the battery cell 9 that has just fallen. As the battery cell 9 enters the welding box 13, the low-melting point metal wire is welded to the battery cell 9, and the new battery cell 9 continues to fall and presses on the cut low-melting point metal wire, and is connected in series with the subsequent battery cells 9 one after another, thereby realizing the series positioning of the battery cell 9 and the low-melting point metal wire, and making preliminary preparations for the subsequent welding process.

[0032] When the battery cell 9 and the low-melting-point metal wire enter the welding box 13, the low-melting-point metal wire pre-placed at the upper and lower ends of the battery cell 9 is fixed in the welding position under the action of the guide groove, and the pressure roller 14 presses the low-melting-point metal wire and the battery cell 9 together so that they cannot move at will. The welding gun head 15 welds the low-melting-point metal wire to the battery cell 9 so that the low-melting-point metal wire is connected to each fine grid line. After the welding is completed, under the drive of the pressure roller 14, the conductive paddle 16 contacts and slides on the low-melting-point metal wire, and the conductive voltage wheel 17 rolls on the battery cell 9. The conductive voltage wheel 17 and the conductive paddle 16 are connected in the same circuit. When the conductive voltage wheel 17 When in contact with the fine grid wire, the circuit connecting the conductive voltage wheel 17 and the conductive paddle 16 is connected. When the conductive voltage wheel 17 rolls on the battery cell 9, the circuit is continuously turned on and off. Therefore, when the battery cell 9 moves at a constant speed, the circuit conduction and disconnection cycles are uniform. The control system analyzes the on-off status of the circuit in the detection mechanism. If the circuit conduction and disconnection cycles are uneven, it means that a fine grid wire has not been successfully welded to the low-melting-point metal wire. In the subsequent process, the problem position needs to be welded again, thereby realizing automatic detection of the stability of the connection and avoiding the problem of low efficiency of manual detection.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A busbar-free battery connection device with a connection stability detection function, comprising a bottom bracket, characterized in that: A wire feeding box (1), a material discharge box (8), and a welding box (13) are installed on the bottom bracket. The wire feeding box (1) and the welding box (13) are respectively connected to the two sides of the material discharge box (8). A raw material shaft (2) and a wire feeding mechanism are arranged inside the wire feeding box (1). A low-temperature welding wire is arranged on the wire feeding raw material shaft (2). A plurality of battery cells (9) are arranged on the upper part of the material discharge box (8). Four variable pitch rotary rods (10) are arranged inside the material discharge box (8). Two welding gun heads (15) and a detection mechanism are symmetrically arranged in the upper and lower parts of the welding box (13). A group of guide rollers are respectively arranged at the left and right ends of the two welding gun heads (15); Two crankshafts (703) are rotatably arranged on the outer side of the wire feeding box (1), and a connecting rod (704) is rotatably mounted on each of the crankshafts (703). One end of one of the connecting rods (704) is rotatably connected to the upper tool (601), and one end of the other connecting rod (704) is rotatably connected to the lower tool (602); The detection mechanism comprises a conductive paddle (16) and a conductive voltage wheel (17), and the conductive paddle (16) and the conductive voltage wheel (17) in the detection mechanism are both connected to a control system via a circuit.

2. A busbar-free battery connection device with connection stability detection function according to claim 1, characterized in that: An upper cutter (601) and a lower cutter (602) are symmetrically arranged in the middle of the wire feeding box (1), and the upper cutter (601) and the lower cutter (602) are both slidably connected to the wire feeding box (1). The wire feeding mechanism comprises a front roller group and a rear roller group, and the front roller group and the rear roller group are respectively arranged on both sides of the upper cutter (601) and the lower cutter (602). The front roller group comprises a front wire feeding roller (301) and a front anti-slip roller (302), and the front anti-slip roller (302) is located above the front wire feeding roller (301). The rear roller group comprises a rear wire feeding roller (401) and a rear anti-slip roller (402), and the structure and arrangement of the rear roller group are the same as those of the front roller group.

3. A busbar-free battery connection device with connection stability detection function according to claim 2, characterized in that: A first motor (501) is arranged on the outside of the wire feeding box (1); a driving wheel (502) is installed at one end of the front wire feeding roller (301) for wire feeding; a driven wheel (503) is installed at one end of the rear wire feeding roller (401); the first motor (501) is coaxially connected to the driving wheel (502); and a transmission belt is connected between the driving wheel (502) and the driven wheel (503).

4. A busbar-free battery connection device with connection stability detection function according to claim 3, characterized in that: A groove wheel (702) is installed on each of the two crankshafts (703), and a thumbwheel (701) is coaxially connected to each of the front anti-slip roller (302) and the rear anti-slip roller (402), and the two thumbwheels (701) are in contact with the two groove wheels (702) respectively.

5. The busbar-free battery connection device with connection stability detection function according to claim 1, characterized in that: The four variable pitch rotary rods (10) are rotatably installed in the unloading box (8), each of the variable pitch rotary rods (10) is provided with a spiral groove, the pitch of the spiral groove gradually increases from top to bottom, the spiral grooves of the four variable pitch rotary rods (10) have the same rotation direction, and the top edge of each variable pitch rotary rod (10) is in tangential contact with the battery cell (9).

6. A busbar-free battery connection device with connection stability detection function according to claim 5, characterized in that: A servo motor is arranged inside the unloading box (8), and the motor shaft of the servo motor is connected to a main friction wheel (12). The main friction wheel (12) is located at the bottom of the unloading box (8). A small friction wheel (11) is connected to the bottom of each variable pitch rotary rod (10), and all the small friction wheels (11) are in contact with the main friction wheel (12).

7. The busbar-free battery connection device with connection stability detection function according to claim 1, characterized in that: A guide groove is provided on one side of the welding box (13) close to the material discharge box (8), and a material trough is provided inside the welding box (13). Each group of guide rollers includes a pair of pressure rollers (14), and each pair of pressure rollers (14) is arranged at the upper and lower ends of the material trough. The surface of each pressure roller (14) is provided with anti-slip material, and a small motor is installed on one side of each pressure roller (14), and each small motor is connected to a control system.

8. The busbar-free battery connection device with connection stability detection function according to claim 7, characterized in that: The detection mechanism is arranged at the upper end of the material slot, the conductive paddle (16) is made of elastic metal, and the conductive voltage wheel (17) is in contact with the surface of the battery cell (9).

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