Reflective trapezoidal bus bar and trapezoidal bus bar welding machine

Abstract

The present invention relates to the technical field of bus bar welding. Disclosed is a reflective trapezoidal bus bar, comprising a bus bar body, wherein the bus bar body comprises a conductive layer, a thermal resistance layer and a reflective film that are sequentially arranged. Disclosed is a trapezoidal bus bar welding machine, used for welding the reflective trapezoidal bus bar and comprising an interconnecting bar welding mechanism and a bus bar welding mechanism, wherein the bus bar welding mechanism is located on one side of the interconnecting bar welding mechanism; the bus bar welding mechanism comprises a welding assembly; the welding assembly comprises a welding plate, a lower pressing plate, and an electromagnetic induction welding head; the welding plate is fixed on a machine base, and an inverted trapezoidal groove is formed in the welding plate in a penetrating mode; the lower pressing plate is located directly above the welding plate and moves in the vertical direction, and the cross section of the lower pressing plate is in the shape of an inverted trapezoid; the electromagnetic induction welding head is arranged directly below the inverted trapezoidal groove, and the electromagnetic induction welding head moves in the length direction of the inverted trapezoidal groove. The reflective film can improve the light reflection capability of the bus bar and can reflect light to a battery piece, thereby improving the output power of a battery assembly.

Description

Reflective trapezoidal busbar and trapezoidal busbar welding machine Technical Field

[0001] The present invention relates to the technical field of busbar welding, in particular to a reflective trapezoidal busbar and a trapezoidal busbar welding machine. Background Art

[0002] Currently, the photovoltaic industry primarily uses busbars: 4x0.4mm and 4x0.3mm. Both have rectangular cross-sections and are constructed from a copper base layer coated with tin. Busbars primarily collect and transmit current from the cells to the module output, converting and outputting electrical energy. They are metal conductive strips that connect photovoltaic cells and are typically made of copper. Existing busbars have the following disadvantages: First, the 4x0.4mm busbar is relatively thick, increasing the risk of busbar bubbles. Second, the 4x0.4mm busbar, when combined with welding wire, increases the risk of panel explosion under low-temperature static loads. Third, the 4x0.4mm reflective busbar has a relatively small reflective area, resulting in lower module power gains. Fourth, the 4x0.3mm busbar has a relatively small cross-sectional area, reducing module power. Therefore, the present invention provides a new busbar with a reflective trapezoidal shape. However, the setting of the new busbar causes the existing busbar welding machine to be unable to weld the busbar and the interconnecting bar together well. The main problem is that the traditional top-down welding method easily causes damage to the reflective surface of the busbar; secondly, since the welding of the battery cells requires first welding the interconnecting bar, multiple battery cells are connected in series through the interconnecting bar, and then the busbar is welded, and multiple interconnecting bars are connected in series through the busbar. In the prior art, the welding of the interconnecting bar and the welding of the busbar are set at different workstations, and after the interconnecting bar is welded, it is transported to the busbar welding station for welding, which increases the exposure risk of the battery pack and is susceptible to contamination. Secondly, the overall equipment occupies a large area and has low welding efficiency.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a reflective trapezoidal bus bar and a trapezoidal bus bar welding machine to solve the problems mentioned in the above background technology.

[0005] The objective of the present invention is achieved through the following technical solution: a reflective trapezoidal busbar, comprising a busbar body, the surface of which is tin-plated, the busbar body comprising a conductive layer, a thermal resistance layer and a reflective film, the thermal resistance layer being arranged between the reflective film and the conductive layer.

[0006] In some embodiments, the cross-section of the busbar body is formed into a trapezoid, and the dimensions of the cross-section trapezoid are: upper base 4 mm, lower base 6 mm, and height 0.32 mm.

[0007] A trapezoidal busbar welding machine is used to weld the above-mentioned reflective trapezoidal busbars, including an interconnecting bar welding mechanism and a busbar welding mechanism. The interconnecting bar welding mechanism includes a main conveyor belt, a pull bar assembly, an interconnecting bar limit seat and a loading assembly. The interconnecting bar limit seat is installed above the main conveyor belt. A plurality of straightening limit grooves are opened on the interconnecting bar limit seat along the conveying direction of the main conveyor belt. The plurality of straightening limit grooves correspond one-to-one to the plurality of interconnecting grooves on the battery cell. The pull bar assembly is arranged relative to the interconnecting bar limit seat. The pull bar assembly includes a sliding base plate and a splint. The sliding base plate has the freedom to move along the conveying direction of the main conveyor belt. , the clamping plate is provided above the sliding bottom plate, and the clamping plate moves close to or away from the sliding bottom plate, and the loading assembly includes a battery cell storage frame, a crossbeam and a loading seat, the battery cell storage frame is arranged on one side of the main conveyor belt, the crossbeam is located above the main conveyor belt and is perpendicular to the main conveyor belt, and a first linear drive module is provided at the bottom of the crossbeam, a mounting plate is fixed on the slide of the first linear drive module, a first cylinder is vertically mounted on the mounting plate, and the telescopic shaft of the first cylinder is connected to the loading seat, and a plurality of negative pressure suction cups are provided at the bottom of the loading seat, and a shearing mechanism is provided between the interconnecting strip limit seat and the pull strip assembly;

[0008] The busbar welding mechanism includes a machine base, a side conveyor belt, a busbar manufacturing assembly, a busbar loading assembly and a welding assembly, the side conveyor belt is mounted above the machine base, the side conveyor belt is located on one side of the main conveyor belt and is perpendicular to the main conveyor belt, the busbar manufacturing assembly and the welding assembly are both arranged on the machine base, the welding assembly is located between the side conveyor belt and the busbar manufacturing assembly, and a negative pressure loading mechanism is provided between the welding assembly and the busbar manufacturing assembly, the welding assembly includes a welding plate, a lower pressure plate and an electromagnetic induction welding head, the welding plate is fixed on the machine base, an inverted trapezoidal groove is opened through the welding plate, a second linear drive module is installed on the machine base, a drive seat is provided on the slide of the second linear drive module, the lower pressure plate is slidably arranged at the bottom of the drive seat, the lower pressure plate moves along the height direction of the drive seat, the cross-sectional shape of the lower pressure plate is an inverted trapezoid, the electromagnetic induction welding head is arranged directly below the inverted trapezoidal groove, and the electromagnetic induction welding head moves along the length direction of the inverted trapezoidal groove.

[0009] In some embodiments, the busbar production assembly includes a production frame, a busbar winding drum, a rewinding roller, a straightening plate and a cutter, the busbar winding drum is rotatably mounted on the production frame, a first rodless cylinder is vertically mounted on the production frame, a roller seat is mounted on the slide of the first rodless cylinder, the rewinding roller is rotatably set on the roller seat, a guide roller and an output roller are rotatably set on the production frame, the guide roller is located above the busbar winding drum, the output roller is located above the rewinding roller, the rewinding roller is located between the guide roller and the busbar winding drum in the vertical direction, and the rewinding roller is located between the output roller in the horizontal direction The straightening plate is fixed on the machine base between the roller and the busbar winding disk, and a horizontal limit groove is opened through the straightening plate. The busbar is pulled out from the busbar winding disk and sequentially bypasses the guide roller in the same direction, bypasses the rewinding roller in the opposite direction, and bypasses the output roller in the same direction to enter the horizontal limit groove. The inner top wall and the inner bottom wall of the horizontal limit groove are fixed with an elastic layer, and the busbar is adapted to the horizontal limit groove through the deformation interference of the elastic layer. A 7-shaped frame is fixed on the top of the straightening plate, and a second cylinder is vertically installed on the 7-shaped frame. The telescopic shaft of the second cylinder is fixed with a knife seat, and the cutter is fixed at the bottom of the knife seat.

[0010] In some embodiments, a third linear drive module is provided on one side of the straightening seat, a clamping base is installed on the slide of the third linear drive module, a busbar clamping plate is provided above the clamping base, the top of the busbar clamping plate is connected to the output shaft of the third cylinder, the cylinder body of the third cylinder is installed on the clamping base through a bracket, the negative pressure feeding mechanism includes a strip plate, a fourth linear drive module and a negative pressure pipe, an upper frame is fixed on the top of the machine base, two fourth linear drive modules are installed in parallel on the upper frame, a fourth cylinder is vertically installed on the slide of the fourth linear drive module, the telescopic shaft of the fourth cylinder is connected to the strip plate, and a plurality of negative pressure pipes are fixed on the strip plate along its own length direction.

[0011] In some embodiments, a plurality of rectangular grooves are provided at the bottom of the driving seat along its length direction, an electromagnet is provided in the rectangular groove, a rectangular connecting rod is slidably provided in the rectangular groove, one end of the rectangular connecting rod passes through the rectangular groove and is connected to the lower pressure plate, the other end of the rectangular connecting rod is connected to a permanent magnet, a spring is provided in the rectangular groove, the two ends of the spring are respectively connected to the driving seat and the rectangular connecting rod, the permanent magnet generates magnetic poles with the same magnetic properties as the permanent magnet when energized, a fourth rodless cylinder is provided on the machine base, and the electromagnetic induction welding head is installed on the slide seat of the fourth rodless cylinder.

[0012] In some embodiments, a fifth cylinder is vertically installed on the top of the sliding bottom plate. The telescopic shaft of the fifth cylinder is connected to a top plate, and the top plate is connected to the clamping plate through a vertical plate. Second rodless cylinders are installed on both sides of the main conveyor belt conveyor frame, and the sliding bottom plate is installed on the sliding seat of the second rodless cylinder. A bearing plate is arranged in the battery cell storage frame, and a third rodless cylinder is vertically arranged outside the battery cell storage frame. A bearing connecting rod is connected to the sliding seat of the third rodless cylinder, and the bearing connecting rod is fixedly connected to the bottom of the bearing plate.

[0013] In some embodiments, an interconnection bar frame is arranged at one end of the interconnection bar limiting seat away from the pulling bar assembly. A plurality of interconnection bar winding discs are rotatably installed on the interconnection bar frame. The plurality of interconnection bar winding discs correspond to a plurality of straightening limiting grooves one by one. Each interconnection bar winding disc is correspondingly provided with an interconnection bar reverse winding roller. The interconnection bar is pulled out from the interconnection bar winding disc, reversely bypasses the interconnection bar reverse winding roller and enters the straightening limiting groove. The interconnection bar welding mechanism further includes a thermal welding mechanism. The thermal welding mechanism includes a U-shaped frame, a sixth cylinder and a heating seat. The pulling bar assembly is located between the interconnection bar limiting seat and the U-shaped frame. A sixth cylinder is vertically installed on the U-shaped frame, and the telescopic shaft of the sixth cylinder is connected to the heating seat. The heating seat is internally provided with an electric heating sheet.

[0014] In some embodiments, an interconnection bar cutting assembly is arranged between the pulling bar assembly and the interconnection bar limiting seat. The interconnection bar cutting assembly includes a U-shaped knife holder, a seventh cylinder and a cutting knife. The seventh cylinder is vertically installed on the U-shaped knife holder, and the output shaft of the seventh cylinder is connected to a cutting knife seat. The cutting knife is installed at the bottom of the cutting knife seat.

[0015] In some embodiments, a switching loading and unloading component is further included. The switching loading and unloading component includes a fifth linear driving module, an eighth cylinder, a switching plate, a switching negative pressure pipe and a switching support. Two of the fifth linear driving modules are installed in parallel on the switching support. The fifth linear driving module is located above the main conveyor belt and is parallel to the side conveyor belt. The sliding seat of the fifth linear driving module is vertically installed with the eighth cylinder, and the telescopic shaft of the eighth cylinder is connected to the switching plate. A plurality of the switching negative pressure pipes are fixedly penetrated through the switching plate, and the plurality of switching negative pressure pipes are evenly distributed along the length direction of the switching plate.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. A reflective film is provided, which improves the light reflection ability of the bus bar, can reflect light onto the battery cell, and enhances the output power of the battery module.

[0018] 2. The shape of the busbar is set to a trapezoid, and the reflective film is set on the large-size surface of the trapezoid, which increases the reflective area of ​​the busbar and thins the thickness of the return bar, but the cross-sectional area of ​​the busbar remains unchanged, which has no effect on the power of the battery assembly.

[0019] 3. The thickness of the busbar is reduced, thereby reducing the risk of bubbles at the busbar. At the same time, the thickness of the welding wire is thinned, reducing the risk of low-temperature static load thin plates of the components.

[0020] 4. The individual battery cells are connected in series through the interconnection bar welding mechanism, and then the multiple interconnection bars are immediately welded together through the bus bar welding mechanism to form a battery assembly, thereby integrating the welding of the interconnection bars and the welding of the bus bars on the same workstation, reducing the exposure time of the battery assembly and reducing the risk of battery assembly contamination.

[0021] 5. The electromagnetic induction welding head is set below the welding plate to weld the interconnection bar and bus bar at the bottom to avoid damage to the reflective film during the welding process.

[0022] 5. Place the busbar on top of the interconnecting bar, press the busbar into the inverted trapezoidal groove through the lower pressure plate, and through the cooperation of the lower pressure plate and the inverted trapezoidal groove, bend the interconnecting bar to fit the trapezoidal surface of the busbar, thereby expanding the welding area between the interconnecting bar and the busbar. When the thickness of the welding wire is reduced, the welding strength is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a reflective trapezoidal bus bar according to the present invention;

[0024] FIG2 is a cross-sectional schematic diagram of a reflective trapezoidal bus bar according to the present invention;

[0025] FIG3 is a perspective schematic diagram of a trapezoidal busbar welding machine according to the present invention;

[0026] FIG4 is a second perspective schematic diagram of a trapezoidal busbar welding machine according to the present invention;

[0027] Figure 5 is an enlarged view of point A in Figure 4;

[0028] FIG6 is a third perspective schematic diagram of a trapezoidal busbar welding machine according to the present invention;

[0029] FIG7 is a schematic diagram of the internal structure of a driving seat in a trapezoidal busbar welding machine according to the present invention;

[0030] FIG8 is a left side view of a trapezoidal busbar welding machine according to the present invention;

[0031] FIG9 is a front view of a trapezoidal busbar welding machine according to the present invention;

[0032] Figure 10 is an enlarged view of point B in Figure 1;

[0033] Figure 11 is a top view of a trapezoidal bus bar welding machine according to the present invention;

[0034] In the figure, 1 - bus bar body, 2 - conductive layer, 3 - thermal resistance layer, 4 - reflective film, 5 - main conveyor belt, 6 - interconnection bar limiting seat, 7 - straightening limiting groove, 8 - sliding base plate, 9 - clamping plate, 10 - battery cell storage frame, 11 - cross beam, 12 - loading seat, 13 - first linear drive module, 14 - mounting plate, 15 - first cylinder, 16 - negative pressure suction cup, 17 - machine base, 18 - side conveyor belt, 19 - welding plate, 20 - lower pressing plate, 21 - inverted trapezoidal groove, 22 - electromagnetic induction welding head, 23 - second linear drive module, 24 - drive seat, 25 - production frame, 26 - bus bar winding disk, 27 - reverse winding roller, 28 - straightening plate, 29 - cutting knife, 30 - guiding roller, 31 - output roller, 32 - first rodless cylinder, 33 - roller seat, 34 - horizontal limiting groove, 35 - 7-shaped frame, 36 - second cylinder, 37 - knife seat, 38 - third linear drive module, 39 - clamping base plate, 40 - bus bar clamping plate, 41 - third cylinder, 42 - strip plate, 43 - fourth linear drive module, 44 - negative pressure pipe, 45 - upper frame, 46 - fourth cylinder, 47 - rectangular groove, 48 - electromagnet, 49 - rectangular connecting rod, 50 - permanent magnet, 51 - spring, 52 - fifth cylinder, 53 - top plate, 54 - vertical plate, 55 - second rodless cylinder, 56 - bearing plate, 57 - third rodless cylinder, 58 - bearing connecting rod, 59 - interconnection bar frame, 60 - interconnection bar winding disk, 61 - interconnection bar reverse winding roller, 62 - 冂-shaped frame, 63 - sixth cylinder, 64 - heating seat, 65 - 冂-shaped knife holder, 66 - seventh cylinder, 67 - cutting knife, 68 - cutting knife seat, 69 - fifth linear drive module, 70 - eighth cylinder, 71 - switching plate, 72 - switching negative pressure pipe, 73 - switching support, 74 - fourth rodless cylinder. Specific embodiments

[0035] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0036] As shown in Figures 1 and 2, a reflective trapezoidal busbar includes a busbar body 1. The surface of the busbar body 1 is tin-plated. The busbar body 1 includes a conductive layer 2, a thermal resistance layer 3 and a reflective film 4. The thermal resistance layer 3 is arranged between the reflective film 4 and the conductive layer 2. The conductive layer 2 is tin-plated so that the conductive layer 2 of the busbar body 1 contacts the interconnection bar for welding. The provision of the reflective film 4 improves the reflective ability of the busbar, can reflect light onto the battery cell, and improve the output power of the battery assembly. The provision of the thermal resistance layer 3 reduces the temperature of the reflective film 4 during the welding process, protecting the reflective film 4 from damage during the welding process. The cross-sectional shape of the reflective film 4 is an isosceles triangle with a vertex angle of 120°, which has a good reflective effect and can effectively reflect light onto the battery panel assembly.

[0037] Furthermore, as shown in FIG2 , the cross-section of the busbar body 1 is formed into a trapezoid. The shape of the busbar is set to a trapezoid, and the reflective film 4 is arranged on the large-size surface of the trapezoid, thereby increasing the reflective area of ​​the busbar. The cross-sectional trapezoidal dimensions are 4 mm on the upper bottom, 6 mm on the lower bottom, and 0.32 mm in height. Compared with the existing return bar, the thickness of the busbar is reduced, thereby reducing the risk of bubbles at the busbar. At the same time, the thickness of the welding wire is thinned, reducing the risk of low-temperature static load thin plates of the component. The thickness of the return bar is thinned, but the cross-sectional area of ​​the busbar remains unchanged, which has no effect on the power of the battery component.

[0038] As shown in Figures 3 to 11, a trapezoidal busbar welding machine is used to weld the above-mentioned reflective trapezoidal busbars, including an interconnecting bar welding mechanism and a busbar welding mechanism. The interconnecting bar welding mechanism includes a main conveyor belt 5, a pull rod assembly, an interconnecting bar limit seat 6 and a feeding assembly. The interconnecting bar limit seat 6 is installed above the main conveyor belt 5. A plurality of straightening limit grooves 7 are opened on the interconnecting bar limit seat 6 along the conveying direction of the main conveyor belt 5. The plurality of straightening limit grooves 7 correspond one-to-one to the plurality of interconnecting grooves on the battery cell. The pull rod assembly is arranged relative to the interconnecting bar limit seat 6. The pull rod assembly includes a sliding base plate 8 and a splint 9. The sliding base plate 8 has the freedom to move along the conveying direction of the main conveyor belt 5. A splint 9 is arranged above the sliding base plate 8. The splint 9 is close to or away from the sliding base plate 8 The loading assembly includes a cell storage frame 10, a crossbeam 11 and a loading seat 12. The cell storage frame 10 is arranged on one side of the main conveyor belt 5. The crossbeam 11 is located above the main conveyor belt 5 and is perpendicular to the main conveyor belt 5. A first linear drive module 13 is provided at the bottom of the crossbeam 11. A mounting plate 14 is fixed on the slide of the first linear drive module 13. A first cylinder 15 is vertically installed on the mounting plate 14. The telescopic shaft of the first cylinder 15 is connected to the loading seat 12. A plurality of negative pressure suction cups 16 are provided at the bottom of the loading seat 12. A shearing mechanism is provided between the interconnection bar limit seat 6 and the pull bar assembly; the individual cells are neatly stacked along the height direction of the cell storage frame 10, and the negative pressure suction cup 16 is driven by the first linear drive module 13 to move between the cell storage frame 10 and the main conveyor belt 5. The battery pack is placed on the main conveyor belt 5 and the negative pressure suction cup 16 is moved up and down by the extension and contraction of the first cylinder 15, so that the negative pressure suction cup 16 extends into the battery cell storage frame 10 to absorb the battery cell, and the battery cell is placed on the main conveyor belt 5 to complete the loading operation. The specific process is that the interconnection bar passes through the straightening limit groove 7 so that it is located between the interconnection bar limit seat 6 and the sliding base plate 8. The interconnection bar is limited by the straightening limit groove 7 so that each interconnection bar corresponds to the interconnection bar groove on the battery cell, and the sliding base plate 8 moves close to the interconnection bar limit seat 6 so that the interconnection bar is located between the sliding base plate 8 and the clamping plate 9, and then the clamping plate 9 moves down to clamp the interconnection bar, and then the sliding base plate 8 moves away from the interconnection bar limit seat 6 to pull the interconnection bar out and make the interconnection bar straightened, and then the battery cell is placed by the negative pressure suction cup 16 On the interconnection strip, the battery cell is pressed down to make it fall on the main conveyor belt 5, so that the interconnection strip is stuck in the interconnection strip groove below this battery cell, and then the interconnection strip is cut. The main conveyor belt 5 drives the battery cell to move the width of one battery cell, leaving space for loading the next battery cell, and then the pull-bar assembly pulls out the interconnection strip again. This time the pulled-out length of the interconnection strip is the width of two battery cells, so that the interconnection strip is stuck in the interconnection strip groove above the previous battery cell, and then the loading assembly places the next battery cell on the main conveyor belt 5, and presses down to make the interconnection strip stuck in the interconnection strip groove at the bottom of this battery cell, and so on, so that part of the interconnection strip between two adjacent battery cells is stuck on the top surface of one battery cell, and the other part is stuck on the bottom surface of the other battery cell, thereby connecting multiple battery cells in series to form a battery assembly.It should be noted that when configuring the first battery cell, the moving distance of the sliding base plate 8 away from the interconnection bar limit seat 6 is greater than the width of one battery cell and less than the width of two battery cells, so that the interconnection bar has a certain length at one end of the battery cell assembly so that it can be welded to the bus bar, so that the bus bar can connect multiple interconnection bars in series.The busbar welding mechanism includes a machine base 17, a side conveyor belt 18, a busbar production assembly, a busbar feeding assembly and a welding assembly. The side conveyor belt 18 is mounted above the machine base 17. The side conveyor belt 18 is located on one side of the main conveyor belt 5 and is perpendicular to the main conveyor belt 5. The busbar production assembly and the welding assembly are both arranged on the machine base 17. The welding assembly is located between the side conveyor belt 18 and the busbar production assembly. A negative pressure feeding mechanism is provided between the welding assembly and the busbar production assembly. The welding assembly includes a welding plate 19, a lower pressure plate 20 and an electromagnetic induction welding head 22. The welding plate 19 is fixed on the machine base 17. An inverted trapezoidal groove 21 is provided through the welding plate 19. The machine base 17 is equipped with a first Two linear drive modules 23, a drive seat 24 is provided on the slide of the second linear drive module 23, the lower pressure plate 20 is slidably provided at the bottom of the drive seat 24, the lower pressure plate 20 moves along the height direction of the drive seat 24, the cross-sectional shape of the lower pressure plate 20 is an inverted trapezoid, the electromagnetic induction welding head 22 is provided just below the inverted trapezoidal groove 21, the electromagnetic induction welding head 22 moves along the length direction of the inverted trapezoidal groove 21, the battery cell assembly completed in series is transported to the input end of the side conveyor belt 18 through the main conveyor belt 5, so that the battery cell assembly is transported to the side conveyor belt 18, and the battery cell assembly is transported to the busbar welding station through the side conveyor belt 18. At this time, the interconnection bar is located on the upper side of the welding plate 19. The required busbar length is cut out through the busbar production assembly, and then the produced busbar is prevented from being directly above the welding plate 19 through the negative pressure feeding mechanism. At this time, the conductive layer 2 of the busbar is downwardly contacted on the top of the interconnection bar, and then the second linear drive module 23 drives the lower pressing plate 20 to move so that the lower pressing plate 20 is directly above the inverted trapezoidal groove 21, and then the lower pressing plate 20 moves downward, and the busbar is pressed into the inverted trapezoidal groove 21 through the lower pressing plate 20. Through the cooperation of the lower pressing plate 20 and the inverted trapezoidal groove 21, the interconnection bar is bent and fits the trapezoidal surface of the busbar, thereby expanding the welding area between the interconnection bar and the busbar. When the thickness of the welding wire is reduced, the welding strength is not affected, and then The electromagnetic induction welding head 22 moves along the length direction of the busbar, and uses electromagnetic means to heat the busbar so that the tin on it melts and is welded together with the interconnecting bar. Electromagnetic induction welding is an existing technology and will not be described in detail here. However, this application changes the setting position of the electromagnetic induction welding head 22, and sets the electromagnetic induction welding head 22 below the busbar for welding. This design is based on the new design structure of the busbar, mainly to make the electromagnetic induction welding head 22 away from the reflective film 4 for welding. In addition, the heat insulation effect of the thermal resistance layer 4 greatly reduces the welding temperature of the reflective film 4, changes the welding environment of the reflective film 4, and avoids damage to the reflective film 4 during the welding process.

[0039] Furthermore, as shown in Figures 3 and 4, it also includes a switching loading component, a fifth linear drive module 69, an eighth cylinder 70, a switching plate 71, a switching negative pressure pipe 72 and a switching bracket 73. Two fifth linear drive modules 69 are installed in parallel on the switching bracket 73. The fifth linear drive module 69 is located above the main conveyor belt 5, and the fifth linear drive module 69 is parallel to the side conveyor belt 18. The eighth cylinder 70 is vertically installed on the slide of the fifth linear drive module 69. The telescopic shaft of the eighth cylinder 70 is connected to the switching plate 71. A plurality of switching negative pressure pipes 72 are fixedly penetrated on the switching plate 71. The plurality of switching negative pressure pipes 72 are evenly distributed along the length direction of the switching plate 71. The loading assembly is replaced to place the battery cell assembly on the main conveyor belt 5 on the side conveyor belt 18. Specifically, the fifth linear drive module 69 drives the negative pressure tube 72 to move on the main conveyor belt 5 and the side conveyor belt 18. The number of negative pressure tubes 72 is equal to the number of battery cells in the battery cell assembly and corresponds one to one. The negative pressure tube 72 is driven up and down by the extension and contraction of the eighth cylinder 70 so that the negative pressure tube 72 contacts the battery cell. The negative pressure tube 72 is connected to the vacuum pump through a pipeline, and the battery cell assembly is adsorbed by vacuum, and the linear freedom of the fifth linear drive module 69 is cooperated to load the battery cell assembly on the main conveyor belt 5 onto the side conveyor belt 18 and send it to the bus bar welding mechanism for bus bar welding.

[0040] In some embodiments, as shown in Figures 3 to 9, the busbar production assembly includes a production frame 25, a busbar winding drum 26, a rewinding roller 27, a straightening plate 28 and a cutter 29. The busbar winding drum 26 is rotatably mounted on the production frame 25. A first rodless cylinder 32 is vertically mounted on the production frame 25. A roller seat 33 is mounted on the slide seat of the first rodless cylinder 32. The rewinding roller 27 is rotatably set on the roller seat 33. A guide roller 30 and an output roller 31 are rotatably set on the production frame 25. The guide roller 30 is located above the busbar winding drum 26, and the output roller 31 is located above the rewinding roller 27. The rewinding roller 27 is located between the guide roller 30 and the busbar winding drum 26 in the vertical direction, and the rewinding roller 27 is located between the output roller 31 and the busbar winding drum 26 in the horizontal direction. The straightening plate 28 is fixed on the machine base 17. A horizontal limit groove 34 is opened on the straightening plate 28. The busbar is pulled out from the busbar winding drum 26 and sequentially bypasses the guide roller 30 in the same direction, bypasses the rewinding roller 27 in the opposite direction, and bypasses the output roller 31 in the same direction to enter the horizontal limit groove 34. The inner top wall and the inner bottom wall of the horizontal limit groove 34 are fixed with an elastic layer. The busbar is adapted to the horizontal limit groove by the deformation interference of the elastic layer. In the groove 34, a 7-shaped frame 35 is fixed on the top of the straightening plate 28, and a second cylinder 36 is vertically installed on the 7-shaped frame 35. A knife seat 37 is fixed to the telescopic shaft of the second cylinder 36, and the cutter 29 is fixed to the bottom of the knife seat 37. The busbar is wound on the busbar winding drum 26, and one end passes through the guide roller 30, the rewinding roller 27 and the output roller 31 in sequence to penetrate into the horizontal limit groove 34 and pass out from the other end of the horizontal limit groove 34. It should be noted that the winding direction of the busbar on the busbar winding drum 26 is opposite to the winding direction on the rewinding roller 27. This is to improve the busbar. In the bent state, since the busbar is wound on the busbar winding drum 26, the busbar will bend in the winding direction. It is difficult to complete the loading and welding of the busbar in the bent state. Therefore, the busbar first bypasses the rewinding roller 27 in the reverse direction during the lead-out process, and the rewinding roller 27 is driven up and down by the action of the first rodless cylinder 32, which has the effect of straightening the busbar in the reverse direction, and then improves the improvement effect. Finally, the elastic layer in the horizontal limit groove 34 is squeezed to make the busbar pass through the horizontal limit groove 34 in a straight state, which is convenient for the subsequent welding of the busbar and the interconnecting bar.

[0041] Furthermore, as shown in Figures 3 to 9, a third linear drive module 38 is provided on one side of the straightening seat 28, a clamping base plate 39 is installed on the slide of the third linear drive module 38, a busbar clamping plate 40 is provided above the clamping base plate 39, the top of the busbar clamping plate 40 is connected to the output shaft of the third cylinder 41, the cylinder body of the third cylinder 41 is installed on the clamping base plate 39 through a bracket, and the negative pressure feeding mechanism includes a strip plate 42, a fourth linear drive module 43 and a negative pressure pipe 44. , an upper frame 45 is fixed on the top of the base 17, two fourth linear drive modules 43 are installed in parallel on the upper frame 45, a fourth cylinder 46 is vertically installed on the slide of the fourth linear drive module 43, the telescopic shaft of the fourth cylinder 46 is connected to the strip plate 42, and a plurality of negative pressure tubes 44 are fixedly passed through the strip plate 42 along its own length direction, and the clamping bottom plate 39 is driven by the third linear drive module 38 to move close to or away from the straightening plate 28, so that one end of the bus bar is located at the bus bar clamping plate 4 0 and the clamping base plate 39, and then the busbar clamping plate 40 is driven up and down by the extension and contraction of the third cylinder 41, so that one end of the busbar is clamped between the clamping base plate 39 and the busbar clamping plate 40, and then the clamping base plate 39 is driven to move by the third linear drive module 38, so that the busbar is pulled out to a specified length, and then the fourth linear drive module 43 drives the strip plate 42 to move between the busbar production assembly and the welding assembly, and the strip plate 42 is driven up and down by the extension and contraction of the fourth cylinder 46, so that the negative pressure tube 44 on the strip plate 42 contacts the busbar, and the busbar is clamped by vacuum adsorption, and then the cutter 29 moves downward under the action of the second cylinder 36 to cut off the busbar, and then the busbar is transported to the top of the welding plate 19 by the action of the fourth linear drive module 43, and placed on the interconnecting bar, and finally welded together by the welding assembly, so as to realize the production, loading and welding operations of the busbar with a high degree of automation.

[0042] In one embodiment, as shown in Figures 3 to 7, a plurality of rectangular grooves 47 are provided at the bottom of the drive seat 24 along its length direction, an electromagnet 48 is provided in the rectangular groove 47, a rectangular connecting rod 49 is slidingly provided in the rectangular groove 47, one end of the rectangular connecting rod 49 passes through the rectangular groove 47 to connect to the lower pressure plate 20, the other end of the rectangular connecting rod 49 is connected to a permanent magnet 50, a spring 51 is provided in the rectangular groove 47, the two ends of the spring 51 are respectively connected to the drive seat 24 and the rectangular connecting rod 49, the permanent magnet 50 is energized to generate a magnetic pole with the same magnetic property as the permanent magnet 50, a fourth rodless cylinder 74 is provided on the machine base 17, and the electromagnetic induction welding head 22 is installed on the slide of the fourth rodless cylinder 74, after the bus bar is placed on the interconnecting bar, the lower pressure plate 20 is driven by the second linear drive module 23 Move to the bottom of the inverted trapezoidal groove 21, and then the electromagnet 48 is energized to generate a magnetic pole with the same magnetic property as the permanent magnet 50, so that the electromagnet 48 repels the permanent magnet 50 to push the rectangular connecting rod 49 to move downward, and the rectangular connecting rod 49 drives the lower pressure plate 20 to adapt to the inverted trapezoidal groove 21 to complete the contact matching of the bus bar and the interconnection bar. The electromagnetic method has the advantages of small footprint and short stroke, and can push the bus bar into the inverted trapezoidal groove 21, and then the electromagnetic induction welding head 22 is driven by the fourth rodless cylinder 74 to move for welding. After the welding is completed, the bus bar production assembly, the bus bar loading assembly and the welding assembly are reset, waiting for the next welding operation, and the welded battery cell assembly is sent out through the side conveyor belt 18.

[0043] In some embodiments, as shown in Figures 3 to 11, a fifth cylinder 52 is vertically installed on the top of the sliding base plate 8, and the telescopic shaft of the fifth cylinder 52 is connected to the top plate 53. The top plate 53 is connected to the splint 9 through the vertical plate 54. A second rodless cylinder 55 is installed on both sides of the main conveyor belt 5 conveyor frame. The sliding base plate 8 is installed on the slide seat of the second rodless cylinder 55. The splint 9 is moved up and down by the telescopic movement of the fifth cylinder 52 to complete the clamping of the interconnection strip. A carrying plate 56 is provided in the battery cell storage frame 10. The battery cell storage frame 1 0 is vertically provided with a third rodless cylinder 57 on the outside, and a load-bearing connecting rod 58 is connected to the slide seat of the third rodless cylinder 57. The load-bearing connecting rod 58 is fixedly connected to the bottom of the load-bearing plate 56, and the load-bearing plate 56 is driven up and down by the third rodless cylinder 57. After the battery cell is loaded, the load-bearing plate 56 moves upward by the thickness of a battery cell, so as to keep the loading height consistent each time, shorten the movement stroke of the loading component, and the loading of the loading component and the movement of the load-bearing plate 56 can be carried out simultaneously, thereby reducing working hours and improving efficiency.

[0044] In some embodiments, as shown in FIGS. 1 to 10, an interconnection bar holder 59 is provided at one end of the interconnection bar limiting seat 6 away from the tension bar assembly. A plurality of interconnection bar winding discs 60 are rotatably mounted on the interconnection bar holder 59. The plurality of interconnection bar winding discs 60 correspond to the plurality of straightening limiting grooves 7 one by one. Each interconnection bar winding disc 60 is correspondingly provided with an interconnection bar reverse winding roller 61. The interconnection bar is pulled out from the interconnection bar winding disc 60 and reversely bypasses the interconnection bar reverse winding roller 61 and then enters the straightening limiting groove 7. The interconnection bar welding mechanism further includes a thermal welding mechanism. The thermal welding mechanism includes a U-shaped frame 62, a sixth cylinder 63 and a heating seat 64. The tension bar assembly is located between the interconnection bar limiting seat 6 and the U-shaped frame 62. A sixth cylinder 63 is vertically mounted on the U-shaped frame 62. The telescopic shaft of the sixth cylinder 63 is connected to the heating seat 64. The heating seat 64 is internally provided with an electric heating sheet. An interconnection bar cutting assembly is provided between the tension bar assembly and the interconnection bar limiting seat 6. The interconnection bar cutting assembly includes a U-shaped knife holder 65, a seventh cylinder 66 and a cutting knife 67. The seventh cylinder 66 is vertically mounted on the U-shaped knife holder 65. The output shaft of the seventh cylinder 66 is connected to a cutting knife seat 68. The cutting knife 67 is mounted at the bottom of the cutting knife seat 68. The interconnection bar is wound around the interconnection bar winding disc 60. One end of the interconnection bar bypasses the interconnection bar reverse winding roller 61 and penetrates into the straightening limiting groove 7 and then exits from the straightening limiting groove 7. Similarly, the winding direction of the interconnection bar on the interconnection bar winding disc 60 is different from the winding direction on the interconnection bar reverse winding roller 61, which improves the bending state of the interconnection bar. The interconnection bar is further straightened by the action of the straightening limiting groove 7, so that the interconnection bar can be well stuck in the interconnection bar groove of the battery cell. After two battery cells are connected in series, the seventh cylinder 66 drives the cutting knife 67 to move downward to cut off the interconnection bar, and then the interconnection bar is continuously pulled out by the tension bar assembly to continue the connection in series of the battery cells; the interconnection bar is also tinned. After the battery cells are connected in series, they will be conveyed to directly above the heating seat 64 by the main conveyor belt 5. The sixth cylinder 63 drives the heating seat 64 to contact the battery cells, and the interconnection bar is heated by the heating seat 64 to melt the tin thereon, thereby welding the interconnection bar to the battery cells and completing the rapid welding of the interconnection bar.

[0045] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention; and as known to those of ordinary skill in the art, the beneficial effects that the present invention aims to achieve are only better beneficial effects compared with the current implementation schemes in the prior art under specific circumstances, rather than directly achieving the best use effects in the industry.

[0046] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A reflective trapezoidal busbar, comprising a busbar body (1), the surface of the busbar body (1) being tin-plated, characterized in that: The busbar body (1) comprises a conductive layer (2), a thermal resistance layer (3) and a reflective film (4); the thermal resistance layer (3) is arranged between the reflective film (4) and the conductive layer (2).

2. A reflective trapezoidal bus bar according to claim 1, characterized in that: The cross section of the busbar body (1) is formed into a trapezoid, and the dimensions of the cross section trapezoid are: upper bottom 4 mm, lower bottom 6 mm, and height 0.32 mm.

3. A trapezoidal busbar welding machine, used for welding the reflective trapezoidal busbar as claimed in claim 2, characterized in that: It comprises an interconnection bar welding mechanism and a bus bar welding mechanism, wherein the interconnection bar welding mechanism comprises a main conveyor belt (5), a pull rod assembly, an interconnection bar limit seat (6) and a loading assembly, wherein the interconnection bar limit seat (6) is installed above the main conveyor belt (5), and a plurality of straightening limit grooves (7) are provided on the interconnection bar limit seat (6) along the conveying direction of the main conveyor belt (5), and the plurality of straightening limit grooves (7) correspond one to one with the plurality of interconnection grooves on the battery cell, the pull rod assembly is arranged relative to the interconnection bar limit seat (6), and the pull rod assembly comprises a sliding base plate (8) and a clamping plate (9), wherein the sliding base plate (8) has the freedom to move along the conveying direction of the main conveyor belt (5), and the clamping plate (9) is arranged above the sliding base plate (8), and the clamping plate (9) is close to or away from The sliding base plate (8) moves, and the loading assembly includes a battery cell storage frame (10), a crossbeam (11) and a loading seat (12). The battery cell storage frame (10) is arranged on one side of the main conveyor belt (5), and the crossbeam (11) is located above the main conveyor belt (5) and is perpendicular to the main conveyor belt (5). A first linear drive module (13) is arranged at the bottom of the crossbeam (11), and a mounting plate (14) is fixed on the sliding seat of the first linear drive module (13). A first cylinder (15) is vertically mounted on the mounting plate (14), and the telescopic shaft of the first cylinder (15) is connected to the loading seat (12). A plurality of negative pressure suction cups (16) are arranged at the bottom of the loading seat (12), and a shearing mechanism is arranged between the interconnection strip limit seat (6) and the pull strip assembly; The busbar welding mechanism comprises a machine base (17), a side conveyor belt (18), a busbar manufacturing assembly, a busbar feeding assembly and a welding assembly. The side conveyor belt (18) is mounted above the machine base (17). The side conveyor belt (18) is located on one side of the main conveyor belt (5) and is perpendicular to the main conveyor belt (5). The busbar manufacturing assembly and the welding assembly are both arranged on the machine base (17). The welding assembly is located between the side conveyor belt (18) and the busbar manufacturing assembly. A negative pressure feeding mechanism is arranged between the welding assembly and the busbar manufacturing assembly. The welding assembly comprises a welding plate (19), a lower pressure plate (20) and an electromagnetic induction welding head (22). The connecting plate (19) is fixed on the machine base (17), and an inverted trapezoidal groove (21) is penetrated through the welding plate (19). A second linear drive module (23) is installed on the machine base (17), and a driving seat (24) is arranged on the sliding seat of the second linear drive module (23). The lower pressing plate (20) is slidably arranged at the bottom of the driving seat (24), and the lower pressing plate (20) moves along the height direction of the driving seat (24). The cross-sectional shape of the lower pressing plate (20) is an inverted trapezoid. The electromagnetic induction welding head (22) is arranged directly below the inverted trapezoidal groove (21), and the electromagnetic induction welding head (22) moves along the length direction of the inverted trapezoidal groove (21).

4. A trapezoidal busbar welding machine according to claim 3, characterized in that: The busbar manufacturing assembly comprises a manufacturing frame (25), a busbar winding drum (26), a rewinding roller (27), a straightening plate (28) and a cutter (29); the busbar winding drum (26) is rotatably mounted on the manufacturing frame (25); a first rodless cylinder (32) is vertically mounted on the manufacturing frame (25); a roller seat (33) is mounted on the sliding seat of the first rodless cylinder (32); the rewinding roller (27) is rotatably mounted on the roller seat (33); a guide roller (30) and an output roller (31) are rotatably mounted on the manufacturing frame (25); the guide roller (30) is located above the busbar winding drum (26); the output roller (31) is located above the rewinding roller (27); the rewinding roller (27) is located between the guide roller (30) and the busbar winding drum (26) in the vertical direction; and the rewinding roller (27) is located between the guide roller (30) and the busbar winding drum (26) in the horizontal direction. The straightening plate (28) is fixed on the machine base (17) between the output roller (31) and the busbar winding drum (26). A horizontal limit groove (34) is formed through the straightening plate (28). The busbar is pulled out from the busbar winding drum (26) and sequentially bypasses the guide roller (30) in the same direction, bypasses the rewinding roller (27) in the opposite direction, bypasses the output roller (31) in the same direction, and enters the horizontal limit groove (34). The inner top wall and the inner bottom wall of the horizontal limit groove (34) are both fixed with elastic layers. The busbar is fitted in the horizontal limit groove (34) through deformation interference of the elastic layer. A 7-shaped frame (35) is fixed on the top of the straightening plate (28). A second cylinder (36) is vertically installed on the 7-shaped frame (35). A knife seat (37) is fixed to the telescopic shaft of the second cylinder (36). The cutting knife (29) is fixed at the bottom of the knife seat (37).

5. A trapezoidal busbar welding machine according to claim 4, characterized in that: A third linear drive module (38) is arranged on one side of the straightening seat (28); a clamping base plate (39) is installed on the slide seat of the third linear drive module (38); a busbar clamping plate (40) is arranged above the clamping base plate (39); the top of the busbar clamping plate (40) is connected to the output shaft of the third cylinder (41); the cylinder body of the third cylinder (41) is installed on the clamping base plate (39) through a bracket; the negative pressure feeding mechanism comprises a strip plate (42), A fourth linear drive module (43) and a negative pressure tube (44), an upper frame (45) is fixed on the top of the machine base (17), two fourth linear drive modules (43) are installed in parallel on the upper frame (45), a fourth cylinder (46) is vertically installed on the slide seat of the fourth linear drive module (43), the telescopic shaft of the fourth cylinder (46) is connected to the strip plate (42), and a plurality of negative pressure tubes (44) are fixedly penetrated on the strip plate (42) along its own length direction.

6. A trapezoidal busbar welding machine according to claim 5, characterized in that: A plurality of rectangular grooves (47) are formed in the bottom of the driving seat (24) along its length direction. An electromagnet (48) is arranged in the rectangular groove (47). A rectangular connecting rod (49) is slidably arranged in the rectangular groove (47). One end of the rectangular connecting rod (49) penetrates out of the rectangular groove (47) to be connected with the lower pressing plate (20). The other end of the rectangular connecting rod (49) is connected with a permanent magnet (50). A spring (51) is arranged in the rectangular groove (47). Two ends of the spring (51) are respectively connected with the driving seat (24) and the rectangular connecting rod (49). The permanent magnet (50) is energized to generate a magnetic pole with the same magnetism as that of the permanent magnet (50). A fourth rodless cylinder (74) is arranged on the machine base (17). The electromagnetic induction welding head (22) is installed on the sliding seat of the fourth rodless cylinder (74).

7. The trapezoidal busbar welding machine according to claim 3, characterized in that: A fifth cylinder (52) is vertically installed on the top of the sliding bottom plate (8). A telescopic shaft of the fifth cylinder (52) is connected with a top plate (53). The top plate (53) is connected with the clamping plate (9) through a vertical plate (54). Two sides of the conveying frame of the main conveyor belt (5) are both installed with second rodless cylinders (55). The sliding bottom plate (8) is installed on the sliding seat of the second rodless cylinder (55). A bearing plate (56) is arranged in the battery cell storage frame (10). A third rodless cylinder (57) is vertically arranged on the outer side of the battery cell storage frame (10). A bearing connecting rod (58) is connected to the sliding seat of the third rodless cylinder (57). The bearing connecting rod (58) is fixedly connected to the bottom of the bearing plate (56).

8. The trapezoidal busbar welding machine according to claim 7, characterized in that: An interconnection bar frame (59) is arranged at one end of the interconnection bar limiting seat (6) far away from the bar pulling assembly. A plurality of interconnection bar winding discs (60) are rotatably installed on the interconnection bar frame (59). The plurality of interconnection bar winding discs (60) correspond to the plurality of straightening limiting grooves (7) one by one. Each interconnection bar winding disc (60) is correspondingly provided with an interconnection bar reverse winding roller (61). The interconnection bar is pulled out from the interconnection bar winding disc (60), reversely bypasses the interconnection bar reverse winding roller (61), and enters the straightening limiting groove (7). The interconnection bar welding mechanism further includes a thermal welding mechanism. The thermal welding mechanism includes a U-shaped frame (62), a sixth cylinder (63) and a heating seat (64). The bar pulling assembly is located between the interconnection bar limiting seat (6) and the U-shaped frame (62). A sixth cylinder (63) is vertically installed on the U-shaped frame (62). A telescopic shaft of the sixth cylinder (63) is connected with the heating seat (64). The heating seat (64) is internally provided with an electric heating sheet.

9. The trapezoidal busbar welding machine according to claim 8, characterized in that: An interconnection bar cutting assembly is arranged between the bar pulling assembly and the interconnection bar limiting seat (6). The interconnection bar cutting assembly includes a U-shaped knife rest (65), a seventh cylinder (66) and a cutting knife (67). The seventh cylinder (66) is vertically installed on the U-shaped knife rest (65). An output shaft of the seventh cylinder (66) is connected with a cutting knife seat (68). The cutting knife (67) is installed at the bottom of the cutting knife seat (68).

10. The trapezoidal busbar welding machine according to claim 9, characterized in that: The utility model also comprises a switching loading component, the switching loading component comprises a fifth linear drive module (69), an eighth cylinder (70), a switching plate (71), a switching negative pressure pipe (72) and a switching bracket (73), two fifth linear drive modules (69) are installed in parallel on the switching bracket (73), the fifth linear drive module (69) is located above the main conveyor belt (5), and the fifth linear drive module (69) is parallel to the side conveyor belt (18), the eighth cylinder (70) is vertically installed on the slide seat of the fifth linear drive module (69), the telescopic shaft of the eighth cylinder (70) is connected to the switching plate (71), and a plurality of the switching negative pressure pipes (72) are fixedly penetrated on the switching plate (71), and the plurality of the switching negative pressure pipes (72) are evenly distributed along the length direction of the switching plate (71).

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