A hot bar soldering apparatus for a gridless photovoltaic module

Abstract

This invention discloses a hot-press welding device for a grid-less photovoltaic module, comprising: a cell feeding and conveying assembly; a strip cutting assembly including a wire reel, a cutting table, and a cutting unit; a welding conveying assembly including multiple conveyor belts and a driving unit, with a welding gap between adjacent conveyor belts; a negative pressure pick-and-place assembly; an upper hot-pressing assembly including an upper hot-pressing strip connected to a first lifting assembly; and a lower hot-pressing assembly including a lower hot-pressing strip connected to a second lifting assembly. This hot-press welding device for a grid-less photovoltaic module, after the negative pressure pick-and-place assembly completes the pick-and-place operation of the cells and welding strip, uses the upper and lower hot-pressing assemblies to press the welding strip and cells together and then heats them to directly complete the welding. This eliminates the need for a pressure needle mechanism to press the strip before sending it into a light box for infrared heating welding, thus reducing energy consumption, lowering welding costs, and improving welding efficiency.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module manufacturing technology, and in particular to a hot-press welding apparatus for a gridless photovoltaic module. Background Technology

[0002] Solar panels are green energy products that generate electricity using solar energy. Their main core component is the solar cell. Solar cells are mainly divided into gridless cells and grid cells. Compared with grid cells, gridless cells have advantages such as high conversion efficiency, good stability, and low manufacturing difficulty.

[0003] When stringing gridless solar cells, the cells and solder ribbons are typically placed on a conveyor belt, and then a pinning mechanism is used to press the solder ribbons and cells together. Usually, the length of the solder ribbon is slightly less than twice that of the cell. One end of the solder ribbon is pressed against the front of the cell by one of the pinning mechanisms, while the other end is pressed against the back of the cell. Then, the pinning mechanism, the cell, and the solder ribbon are sent into a light box for infrared heating, enabling the cells to be welded together via the solder ribbons. After being sent out of the light box, the pinning mechanism is retrieved and placed on the cell and solder ribbon to be sent into the light box.

[0004] When using the above method for string welding, the pressure pin mechanism needs to be placed and retrieved frequently. This is not only cumbersome and reduces the welding efficiency between cells, but also increases energy consumption due to the placement and retrieval of the pressure pin mechanism. Furthermore, the frequent replacement of the pressure pins and springs in the pressure pin mechanism further increases the cost of cell welding.

[0005] Therefore, it is necessary to improve the existing cell welding equipment. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects in the prior art and provide a hot-press welding device for gridless photovoltaic modules that reduces power consumption, lowers costs, and increases efficiency.

[0007] To achieve the above-mentioned technical effects, the technical solution of the present invention is: a hot-press welding device for a gridless photovoltaic module, comprising:

[0008] A cell feeding and transport assembly, which is used to lay and transport battery cells horizontally;

[0009] A tape cutting assembly includes a reel, a cutting table, and a cutting unit. The reel has a welding strip wound on it and rotates around its own axis to unwind the welding strip and lay it on the cutting table. The cutting unit is used to cut the welding strip laid on the cutting table to form a welding strip with a length less than twice the length of the battery cell.

[0010] A welding transfer assembly includes multiple conveyor belts distributed along its own width direction and a drive unit for driving the conveyor belts to rotate. A welding gap with a width greater than or equal to the width of the welding strip is provided between two adjacent conveyor belts.

[0011] The negative pressure pick-and-place assembly is used to pick up the battery cell and the welding strip, and then place the battery cell flat on the conveyor belt and place the welding strip between two adjacent conveyor belts, so that the two ends of the welding strip are respectively above one of the two adjacent battery cells on the conveyor belt and below the other.

[0012] The upper hot pressing assembly includes an upper hot pressing strip disposed directly above the welding gap and extending in a direction parallel to the length of the welding gap, and the upper hot pressing strip is connected to a first lifting assembly;

[0013] The lower hot pressing assembly includes a lower hot pressing strip disposed between two adjacent conveyor belts and extending in a direction parallel to the length of the welding gap, and the lower hot pressing strip is connected to a second lifting assembly.

[0014] The upper hot-pressing assembly and the lower hot-pressing assembly cooperate to weld the two ends of the welding strip to the front of one of two adjacent battery cells on the conveyor belt and the back of the other, respectively.

[0015] Preferably, in order to save costs and improve welding efficiency, the sheet feeding and conveying assembly, the welding and conveying assembly, and the strip cutting assembly are equally spaced along the width direction of the conveyor belt. The negative pressure pick-and-place assembly includes a first pick-and-place assembly for picking up and placing the battery sheet, a second pick-and-place assembly for picking up and placing the welding strip, and a translation assembly for driving the first pick-and-place assembly and the second pick-and-place assembly to move along a direction parallel to the width direction of the conveyor belt. The first pick-and-place assembly and the second pick-and-place assembly are spaced apart along a direction parallel to the width direction of the conveyor belt, and the interval between them is equal to the interval between the sheet feeding and conveying assembly and the welding and conveying assembly.

[0016] Preferably, in order to further reduce costs and improve welding accuracy and efficiency, the output end of the translation component is connected to the first lifting component, and the output end of the first lifting component is connected to the first pick-and-place component.

[0017] Preferably, in order to improve welding quality, the upper hot pressing strip is slidably connected to the output end of the first lifting assembly in the vertical direction and an upper elastic element is provided between the two; the lower hot pressing strip is slidably connected to the output end of the second lifting assembly in the vertical direction and a lower elastic element is provided between the two.

[0018] Preferably, in order to further improve the welding quality, the lower hot pressing component is positioned directly below the moving path of the first pick-and-place component.

[0019] Preferably, in order to reduce the number of drive sources and further reduce welding costs, the feeding and conveying assembly includes a conveyor belt and conveying rollers located at both ends of the inner side of the conveyor belt; the drive unit is connected to the conveying rollers and the reel in a drive transmission.

[0020] Preferably, in order to guide the welding strip to be laid flat on the cutting table, the cutting table is provided with a guide groove extending parallel to the conveyor belt's transmission direction, and the guide groove is adapted to the welding strip.

[0021] Preferably, in order to improve the cutting quality, the cutting table is also provided with a strip-shaped through hole extending along the direction perpendicular to the length of the guide groove. The cutting unit includes a cutter disposed inside the strip-shaped through hole and a telescopic unit that drives the cutter to move in the vertical direction. The telescopic unit is disposed below the cutting table.

[0022] Preferably, in order to further improve the cutting quality, a limiting strip is provided above the cutting table. The limiting strip spans and fits the opening of the guide groove, and the limiting strip is located between the strip-shaped through holes of the wire reel.

[0023] Preferably, in order to prevent the lower heating strip from transferring heat to the conveyor belt and affecting the normal rotation of the conveyor belt, a heat insulation sheet is provided on the side of the lower heating strip adjacent to the conveyor belt, and the projection of the heat insulation sheet on the horizontal plane is located within the projection of the welding gap on the horizontal plane.

[0024] In summary, compared with the prior art, the hot-press welding device for gridless photovoltaic modules of the present invention, after completing the suction and placement of the battery cell and welding strip through the negative pressure pick-and-place component, uses the upper and lower hot-press components to press the welding strip and battery cell together and then heat them to directly complete the welding. It eliminates the need for a pressure needle mechanism to press the strip and then send it into the light box for infrared heating welding. This reduces energy consumption, lowers welding costs, and improves welding efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 yes Figure 1 Top view;

[0027] Figure 3 yes Figure 1 Side view;

[0028] Figure 4 yes Figure 1 An explosion diagram;

[0029] Figure 5 This is a structural diagram of the supply belt cutting assembly;

[0030] Figure 6 yes Figure 5 A structural diagram from another perspective;

[0031] Figure 7 yes Figure 5 An explosion diagram;

[0032] Figure 8 yes Figure 7 Enlarged view of part A;

[0033] Figure 9 This is a schematic diagram of the chip supply transmission component;

[0034] Figure 10 This is a schematic diagram of the welding transfer assembly.

[0035] Figure 11 yes Figure 10 An explosion diagram;

[0036] Figure 12 This is a schematic diagram of the structure of the lower hot-pressing assembly;

[0037] Figure 13 yes Figure 12 The front view;

[0038] Figure 14 This is a schematic diagram of the connection structure between the negative pressure loading and unloading component and the upper hot pressing component.

[0039] Figure 15 yes Figure 14 An explosion diagram;

[0040] Figure 16 This is a schematic diagram of the connection structure between the upper hot pressing component and the first pick-and-place component;

[0041] Figure 17 yes Figure 16 An explosion diagram;

[0042] Figure 18 This is a schematic diagram of the second pick-and-place component;

[0043] Figure 19 yes Figure 18 An explosion diagram;

[0044] In the diagram: 1. Sheet feeding and conveying assembly; 11. Conveyor belt; 12. Conveyor roller; 13. Conveyor side plate; 14. Conveyor support; 2. Sheet feeding and cutting assembly; 21. Wire reel; 22. Cutting table; 221. Guide groove; 222. Strip through hole; 223. Limiting strip; 23. Cutting unit; 231. Cutter; 232. Telescopic unit; 233. Cutting frame; 24. Welding strip; 25. Rotating shaft; 26. Side mounting plate; 27. Bolt; 3. Welding conveying assembly; 31. Conveyor belt; 32. Welding gap; 33. First gearbox; 34. Second gearbox; 35. Conveyor side plate; 36. Conveyor support; 37. Conveyor roller; 38. Drive motor; 4. Negative pressure pick-and-place assembly; 41. First pick-and-place assembly; 411. First negative pressure pump; 412. First... 413. Negative pressure shell; 42. First negative pressure cover; 43. Second loading and unloading assembly; 44. Third lifting assembly; 45. Third lifting plate; 46. Second negative pressure pump; 47. Second negative pressure shell; 48. Negative pressure cover; 49. Third negative pressure plate; 40. Translation assembly; 41. Fixing frame; 42. Guide rod; 43. Translation frame; 54. Upper hot pressing assembly; 55. Upper hot pressing strip; 66. First lifting assembly; 57. Upper elastic element; 68. Upper guide rod; 69. Upper lifting frame; 60. Upper hot pressing plate; 61. Lower hot pressing assembly; 62. Heat insulation sheet; 63. Second lifting assembly; 64. Lower elastic element; 65. Lower hot pressing frame; 66. Lower lifting plate; 67. Lower hot pressing plate; 7. Battery cell; 8. Welding strip. Detailed Implementation

[0045] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0046] like Figures 1-19 As shown, the hot-press welding apparatus for a gridless photovoltaic module of the present invention includes:

[0047] The cell supply and transfer assembly 1 is used to lay and transfer the battery cell 7 flat.

[0048] The tape cutting assembly 2 includes a coil 21, a cutting table 22 and a cutting unit 23. The coil 21 is wound with welding tape 24 and the coil 21 rotates around its own axis to unwind the welding tape 24 and lay it on the cutting table 22. The cutting unit 23 is used to cut the welding tape 24 laid on the cutting table 22 to form a welding tape 8 with a length less than twice the length of the battery cell 7.

[0049] The welding transfer assembly 3 includes multiple conveyor belts 31 distributed along its own width direction and a drive unit for driving the conveyor belts 31 to rotate. A welding gap 32 with a width greater than or equal to the width of the welding strip 8 is provided between two adjacent conveyor belts 31.

[0050] The negative pressure pick-and-place assembly 4 is used to pick up the battery cell 7 and the welding strip 8 and then place the battery cell 7 flat on the conveyor belt 31 and the welding strip 8 between two adjacent conveyor belts 31, so that the two ends of the welding strip 8 are respectively above one of the two adjacent battery cells 7 on the conveyor belt 31 and below the other.

[0051] The upper hot pressing assembly 5 includes an upper hot pressing strip 51 disposed directly above the welding gap 32 and extending along a direction parallel to the length of the welding gap 32. The upper hot pressing strip 51 is connected to a first lifting assembly 52.

[0052] The lower hot pressing assembly 6 includes a lower hot pressing strip 61 disposed between two adjacent conveyor belts 31 and extending along the length direction parallel to the welding gap 32. The lower hot pressing strip 61 is connected to a second lifting assembly 62.

[0053] The upper hot pressing assembly 5 and the lower hot pressing assembly 6 cooperate to weld the two ends of the welding strip 8 to the front of one of two adjacent battery cells 7 on the conveyor belt 31 and the back of the other, respectively.

[0054] When the hot pressing welding apparatus of the present invention is running, the sheet feeding and conveying assembly 1 provides the battery sheet 7 to be welded, and at the same time, in the strip cutting assembly 2, the coil 21 rotates and unwinds the welding strip 24 onto the cutting table 22. The cutting unit 23 cuts the welding strip 24, so that a part of the welding strip 24 is broken and laid flat on the cutting table 22 to form the welding strip 8.

[0055] The negative pressure pick-and-place assembly 4 is used to pick up the battery cell 7 and the welding strip 8, and alternately place the battery cell 7 and the welding strip 8 on the welding transfer assembly 3. Specifically, during placement, the front of the battery cell 7 is facing up, and the battery cell 7 is laid flat on multiple transfer belts 31. The horizontal transfer belts 31 support the battery cell 7, and one end of the welding strip 8 is placed on the battery cell 7, while the other end is located in the welding gap 32. The lower hot pressing strip 61 in the lower hot pressing assembly 6 supports this end of the welding strip 8 to prevent it from falling off. Then, another battery cell 7 is placed above the end of the welding strip 8 located in the welding gap 32, so that the battery cell 7 is also laid flat on multiple transfer belts 31. After that, it is transferred by the upper hot pressing assembly 5 and the lower hot pressing assembly 6. The pressing components 6 operate in concert. The upper hot pressing component 5's upper hot pressing strip 51 applies pressure from above, locking the end of the welding strip 8 above the battery cell 7 onto the corresponding battery cell 7. At the same time, the upper hot pressing strip 51 is energized and heats up (the upper hot pressing strip 51 is an electric heating strip), so that the welding strip 8 is heated and welded to the front side of the battery cell 7. Simultaneously, the lower hot pressing component 6's lower hot pressing strip 61 applies pressure from below, locking the end of the welding strip 8 below another battery cell 7 onto the back side of the battery cell 7. At the same time, the lower hot pressing strip 61 is energized and heats up (the lower hot pressing strip 61 is an electric heating strip), so that the welding strip 8 is heated and welded to the back side of the battery cell 7. In this way, the welding operation of two adjacent battery cells 7 through the welding strip 8 is completed.

[0056] Then, the conveyor belt 31 of the welding transfer assembly 3 rotates circumferentially, causing the battery cell 7 and welding strip 8 on its top surface to move a certain distance (usually the distance is the sum of the thicknesses of the battery cell 7 and welding strip 8, or slightly higher than the sum of the thicknesses). Then, the negative pressure pick-and-place assembly 4 picks up the battery cell 7 from the conveyor belt 11 of the supply transfer assembly 1 and the welding strip 8 that has already been cut on the cutting table 22 of the supply strip cutting assembly 2. The welding strip 8 is then placed on the conveyor belt 31 of the welding transfer assembly 3 above the battery cell 7 whose front side does not have the welding strip 8 welded on, ensuring that the other end of the welding strip 8 is within the welding gap 32. The battery cell 7 is then placed on top, and the upper hot pressing assembly 5 and the lower hot pressing assembly 6 work together to weld the two ends of the welding strip 8, so that the two ends are welded to the front side of one battery cell 7 and the back side of the other battery cell 7, respectively. This cycle is repeated to achieve the welding operation of two adjacent battery cells 7 via the welding strip 8.

[0057] In summary, the welding device of the present invention does not require the use of a pressure pin structure during operation, thus eliminating the need to replace the pressure pin and spring, reducing welding costs. Furthermore, the elimination of the need for placing and retrieving the pressure pin structure saves energy and improves production efficiency. Moreover, the device directly utilizes the upper hot-pressing assembly 5 and the lower hot-pressing assembly 6 for welding operations, further enhancing welding efficiency. Additionally, before, after, and during welding, the back surface of the solar cell 7 is in contact with the upper surface of the conveyor belt 31, and the lower end of the welding belt 8 is located within the welding gap 32 between two adjacent conveyor belts 31. This ensures that after the solar cell 7 is welded, the sequentially connected solar cells 7 are located on the same plane, thereby improving welding quality and ultimately contributing to improved photovoltaic module product quality.

[0058] In this invention, the specific structure of the welding transfer component 3 is as follows: Figure 10 and Figure 11 As shown, the system includes seven conveyor belts 31, which form six welding gaps 32. The drive unit includes a drive motor 38 and two conveyor rollers 37 located at both ends of the inner side of the conveyor belts 31. The two ends of the conveyor rollers 37 are provided with conveyor side plates 35, which are vertically arranged. The bottoms of the two conveyor side plates 35 are fixedly connected by three conveyor supports 36. The bottoms of the three conveyor supports 36 are provided with conveyor feet. The three conveyor supports 36 are evenly distributed along the conveying direction of the conveyor belts 31. The housing of the drive motor 38 is fixed on the conveyor supports 36, and the output shaft is fixedly connected to one of the conveyor rollers 37 along the coaxial center line.

[0059] When the drive motor 38 starts, it drives one of the transmission rollers 37 to rotate. The transmission roller 37 is connected to the other transmission roller 37 through the transmission belt 31, so that the transmission belt 31 and the other transmission roller 37 rotate at the same time. After the transmission belt 31 rotates, it can drive the battery cell 7 above to move and adjust the position of the battery cell 7 and the welding strip 8.

[0060] A further improvement is that the feeding and conveying assembly 1 includes a conveyor belt 11 and conveying rollers 12 located at both ends of the inner side of the conveyor belt 11; the drive unit is connected to the conveying rollers 12 and the reel 21 for transmission.

[0061] The above structure reduces the number of drive sources and further reduces production costs. Specifically, of the two transmission rollers 37, one end of the transmission roller 37 furthest from the drive motor 38 is coaxially connected to one of the conveying rollers 12 via a first reduction gearbox 33, and the other end is connected to the reel 21 via a second reduction gearbox 34.

[0062] like Figure 9As shown, the feeding and conveying assembly 1 includes a conveyor belt 11 and two conveying rollers 12 located at both ends of the inner side of the conveyor belt 11 and connected by the conveyor belt 11. Conveying side plates 13 are provided at both ends of the conveying rollers 12. The bottoms of the two conveying side plates 13 are fixedly connected by a conveying bracket 14. Through a first reduction gearbox 33, the rotation speed of the conveying roller 37 is the same as the rotation speed of the conveying roller 12, and the direction of rotation of the conveying roller 37 is opposite to that of the conveying roller 12. The cross-sectional dimensions of the conveyor belt 11 and the conveying belt 31 are the same, and the conveyor belt 11 and the conveying belt 31 are located at the same height. Thus, after the conveying roller 37 rotates, the conveying roller 12 rotates at the same speed but in the opposite direction, such as... Figures 1-4 As shown, the welding transfer assembly 3 and the sheet feeding transfer assembly 1 are spaced apart along the width direction of the conveyor belt 31. Based on the above factors, the conveyor belt 11 and the conveyor belt 31 rotate in opposite directions, which facilitates the negative pressure pick-and-place assembly 4 to place the battery sheet 7 at the output end of the conveyor belt 11 onto the input end of the conveyor belt 31. The conveyor belt 11 can simultaneously supply three rows of battery sheets 7 for transmission. Each battery sheet 7 needs to be welded with two welding strips 8 to match the six welding transfer gaps 32 of the welding transfer assembly 3.

[0063] The specific structure of the feeder cutting component 2 is as follows: Figures 5-8 As shown, the tape cutting assembly 2 has six coils 21, which correspond one-to-one with the six welding gaps 32 in the welding transmission assembly 3. In the tape cutting assembly 2, the cutting table 22 is horizontally set by the support legs. Both sides of the cutting table 22 are fixed with side mounting plates 26 by bolts 27. A rotating shaft 25 is set between the two side mounting plates 26. Both coils 21 are fixedly sleeved on the rotating shaft 25. The transmission roller 37 is connected to the rotating shaft 25 through the second reduction gearbox 34 to increase the rotation speed of the rotating shaft 25 and the coils 21, while the direction of rotation remains unchanged, so that the cutting unit 23 can cut and form a welding strip 8 with a length twice that of the battery cell 7.

[0064] A further improvement is that the cutting table 22 is provided with a guide groove 221 extending parallel to the conveying direction of the conveyor belt 31, and the guide groove 221 is adapted to the welding strip 8. Through the design of the guide groove 221, the welding strip 24 after being unwound from the coil 21 can be guided to the unwound shape on the cutting table 22, so that the welding strip 24 on the cutting table 22 can extend along the length direction parallel to the guide groove 221 to form a paper strip shape, so as to cut and pick up the welding strip 24.

[0065] A further improvement is that the cutting table 22 is also provided with a strip-shaped through hole 222 extending along the length direction perpendicular to the guide groove 221. The cutting unit 23 includes a cutter 231 disposed inside the strip-shaped through hole 222 and a telescopic unit 232 that drives the cutter 231 to move in the vertical direction. The telescopic unit 232 is disposed below the cutting table 22. A limiting strip 223 is provided above the cutting table 22. The limiting strip 223 spans and fits the groove of the guide groove 221. The limiting strip 223 is located between the strip-shaped through holes 222 of the thread spool 21.

[0066] The cutting unit 23 also includes a cutting frame 233 fixed below the cutting table 22. The cutting frame 233 has a U-shaped structure. The telescopic unit 232 is preferably a telescopic cylinder. The cylinder of the telescopic cylinder is fixed on the cutting frame 233, and the top of the piston rod is fixedly connected to the cutter 231. The limiting strip 223 and the guide groove 221 cooperate to form a closed-loop through hole for the welding strip 24 to pass through, preventing the welding strip 24 from falling off the guide groove 221. After the welding strip 24 is unwound to a certain length by the wire reel 21, the welding strip 24 is guided by the limiting strip 223 and the guide groove 221, so that the welding strip 24 is laid flat in the guide groove 221. Then the telescopic cylinder drives the cutter 231 to move upward to cut the welding strip 24, so that the welding strip 24 in the part of the guide groove 221 located away from the limiting strip 223 forms a welding strip 8, which is picked up by the negative pressure pick-and-place assembly 4.

[0067] A further improvement is that the sheet feeding and transfer assembly 1, the welding and transfer assembly 3, and the strip cutting assembly 2 are equally spaced along the width direction of the transfer belt 31. The negative pressure pick-and-place assembly 4 includes a first pick-and-place assembly 41 for picking up and placing the battery sheet 7, a second pick-and-place assembly 42 for picking up and placing the welding strip 8, and a translation assembly 43 for driving the first pick-and-place assembly 41 and the second pick-and-place assembly 42 to move along the width direction parallel to the transfer belt 31. The first pick-and-place assembly 41 and the second pick-and-place assembly 42 are spaced apart along the width direction parallel to the transfer belt 31, and the interval between them is equal to the interval between the sheet feeding and transfer assembly 1 and the welding and transfer assembly 3.

[0068] With the above structure, the translation component 43 can simultaneously drive the first pick-and-place component 41 and the second pick-and-place component 42 to move horizontally. This allows the first pick-and-place component 41 and the second pick-and-place component 42 to have two working positions through the action of the translation component 43. In the first working position, the first pick-and-place component 41 is located directly above the output end of the conveyor belt 11 and can pick up the battery cell 7 on the conveyor belt 11. At the same time, the second pick-and-place component 42 is located directly above the welding transfer component 3, and the picked-up welding strip 8 is located just above the welding gap 32, facilitating the placement of the welding strip. One end of the electrode 8 is placed on the top surface of the battery cell 7 on the conveyor belt 31, while the other end is placed in the welding gap 32 and supported by the lower hot pressing assembly 6. In the second working position, the first pick-and-place assembly 41 is located directly above the input end of the conveyor belt 31, enabling it to place the picked-up battery cell 7 above the conveyor belt 31, with the bottom surface of the battery cell 7 facing the welding strip 8 in the welding gap 32. At the same time, the second pick-and-place assembly 42 is located directly above the cutting table 22 of the feeding conveyor assembly 1, enabling it to pick up the welding strip 8 that has been cut on the cutting table 22. In this way, the pick-up and placement work can be performed simultaneously, ensuring working accuracy and improving working efficiency, thereby improving the welding quality and welding efficiency of the battery cell 7.

[0069] A further improvement is that the output end of the translation component 43 is connected to the first lifting component 52; the output end of the first lifting component 52 is connected to the first pick-and-place component 41.

[0070] While the translation component 43 moves the first pick-and-place component 41 and the second pick-and-place component 42, it also moves the first lifting component 52 to adjust the position of the upper hot-pressing component 5. Specifically, in the second working position, the upper hot-pressing component 5 can simultaneously move to directly above the conveyor belt 31, allowing the higher end of the welding strip 8 to be hot-pressed onto the battery cell 7. This reduces the number of drive sources, lowering equipment costs, while ensuring the placement accuracy of the battery cell 7 and the welding strip 8, as well as the accuracy of the hot-pressing welding position. Furthermore, the first lifting component 52 can also move the first pick-and-place component 41 up and down, facilitating smooth pick-and-place of the battery 7.

[0071] A further improvement is that the upper heat-pressing strip 51 is slidably connected to the output end of the first lifting assembly 52 in the vertical direction, and an upper elastic element 53 is provided between the two.

[0072] The upper elastic element 53 and the upper hot pressing strip 51 are slidably connected to the output end of the first lifting assembly 52 in the vertical direction, so that when hot pressing from above, the upper elastic element 53 can apply pressure to the higher end of the welding strip 8 to lock the welding strip 8 onto the battery cell 7, thus avoiding the formation of incomplete welds during hot pressing.

[0073] The specific structures of the negative pressure loading and unloading assembly 4 and the upper hot pressing assembly 5 are as follows: Figure 14-19 As shown, the negative pressure pick-and-place assembly 4 also includes two fixed frames 44 distributed along the width direction of the conveyor belt 31. The two fixed frames 44 are fixedly connected by guide rods 45 horizontally arranged side by side along the conveying direction of the conveyor belt 31. The translation assembly 43 is a translation cylinder, the cylinder of which is fixed on one of the fixed frames 44. The piston rod is axially parallel to the guide rod 45 and fixedly connected to the translation frame 46. The two ends of the translation frame 46 are slidably sleeved on the two guide rods 45. The first lifting assembly 52 and the second pick-and-place assembly 42 are both disposed on the translation frame 46. Thus, after the translation cylinder is activated, under the guidance of the guide rods 45, the translation frame 46 can be guided to move smoothly horizontally along the width direction parallel to the conveyor belt 31 to adjust the position of the upper hot pressing assembly 5, the first pick-and-place assembly 41 and the second pick-and-place assembly 42.

[0074] The first lifting component 52 of the upper hot pressing component 5 is a first lifting cylinder. Its cylinder is fixed on the translation frame 46. The piston rod is fixedly connected to the upper lifting frame 55. The upper lifting frame 55 is slidably connected to the upper guide rod 54 along the vertical direction. The bottom of the upper guide rod 54 is fixedly connected to the upper hot pressing plate 56. The upper guide rod 54 is covered with an upper elastic element 53, which is a compression spring. The upper hot pressing strips 51 are arranged side by side along the width direction of the conveyor belt 31 below the upper hot pressing plate 56.

[0075] Below the upper lifting frame 55, a first negative pressure shell 412 with an open bottom is fixedly connected. The bottom of the first negative pressure shell 412 is fixedly covered with a first negative pressure cover 413. The first negative pressure cover 413 is densely covered with mesh holes. A first negative pressure pump 411 is fixed on the first negative pressure shell 412. The input end of the first negative pressure pump 411 is connected to the first negative pressure cavity formed by the first negative pressure shell 412 and the first negative pressure cover 413.

[0076] With the above design, the first lifting component 52 can simultaneously drive the upper heating strip 51 and the first negative pressure cover 413 to move up and down. When picking up the battery cell 7, after adjusting the first pick-up and put-down component 41 to the first working position, the first lifting component 52 drives the upper lifting frame 55 to move down, so that the first negative pressure cover 413 is close to the battery cell 7 at the output end of the conveyor belt 11. Then, the first negative pressure pump 411 is started to generate negative pressure in the first negative pressure shell 412 to pick up the battery cell.

[0077] When it is necessary to place the battery cell 7 on the conveyor belt 31 and perform hot-press welding on the higher end of the welding strip 8, the system is adjusted to the second working position. The first lifting component 52 drives the upper lifting frame 55 to move down, so that the first negative pressure cover 413 is attached to the top of the input end of the conveyor belt 31. The first negative pressure pump 411 stops working, and the battery cell 7 can be placed on the input end of the conveyor belt 31. At the same time, the upper hot pressing strip 51 applies pressure to the higher end of the welding strip 8 through the upper elastic member 53, so that it is close to the front of the battery cell 7 on the conveyor belt 31. At this time, after the upper hot pressing strip 51 is energized and heated, the welding strip 8 and the front of the battery cell 7 can be welded and fixed.

[0078] The specific structure of the second pick-and-place component 42 is as follows: Figure 18 and Figure 19 As shown, the system includes a third lifting assembly 421, which is a third lifting cylinder. The cylinder barrel is fixed to the translation frame 46. A third lifting plate 422 is fixedly connected to the bottom of the piston rod. A negative pressure cover 425 is fixedly connected to the bottom of the third lifting plate 422. A third negative pressure plate 426 is fixedly covered at the bottom of the negative pressure cover 425. The third negative pressure plate 426 has three sets of negative pressure through holes arranged parallel to each other along the width direction of the conveyor belt 31. These negative pressure through holes are strip-shaped. Three second negative pressure shells 424 are fixed below 6. The second negative pressure shells 424 are respectively covered on each group of negative pressure through holes. The bottom of the second negative pressure shell 424 is provided with two rows of negative pressure round holes, so that the second pick-and-place component 42 has six rows of negative pressure round holes, which correspond to the six coils 21 one by one. A second negative pressure pump 423 is fixed on the negative pressure cover 425. The negative pressure cover 425, the third negative pressure plate 426 and the second negative pressure shells 424 form a second negative pressure cavity. The second negative pressure cavity is connected to the input end of the second negative pressure pump 423.

[0079] With the above structure, the position of the second pick-and-place component 42 is adjusted by the translation component 43. In the first working position, the second pick-and-place component 42 is located directly above the input end of the conveyor belt 31. The position of the second negative pressure shell 424 is lowered by the third lifting cylinder, and the second negative pressure pump 423 is stopped, which facilitates the placement of the welded strip 8, so that one end of the welded strip 8 is located above the front of the battery cell 7 and the other end is located in the welding gap 32, and is supported by the lower hot pressing component 6. In the second working position, the second pick-and-place component 42 is located directly above the cutting table 22. The height of the second negative pressure shell 424 is adjusted by the third lifting cylinder, so that the second negative pressure shell 424 is attached to the top surface of the cutting table 22. On the one hand, it is convenient for the cutting unit 23 to cut the welded strip 24 on the cutting table 22 from below to form the welded strip 8. On the other hand, at this time, each row of negative pressure holes is aligned and close to the welded strip 8. After starting the second negative pressure pump 423, the welded strip 8 can be picked up.

[0080] A further improvement is that the lower hot pressing strip 61 is slidably connected to the output end of the second lifting assembly 62 in the vertical direction and a lower elastic member 63 is provided between the two; the lower hot pressing assembly 6 is located directly below the moving path of the first pick-and-place assembly 41; a heat insulation sheet 611 is provided on the side of the lower hot pressing strip 61 adjacent to the conveyor belt 31, and the projection of the heat insulation sheet 611 on the horizontal plane is located within the projection of the welding gap 32 on the horizontal plane.

[0081] like Figures 11-13 As shown, there are six lower heating strips 61, which are correspondingly set in the six welding gaps 32. Heat insulation sheets 611 are fixed on both sides of the lower heating strips 61 to prevent the lower heating strips 61 from transferring heat to the conveyor belt 31 when they heat up, thus affecting the transmission quality of the conveyor belt 31. A horizontal lower heating plate 67 is fixed at the bottom of the lower heating strips 61. A lower guide rod 64 extending in the vertical direction is fixed at the bottom of the lower heating plate 67. The lower guide rod 64 is fitted with a lower elastic element 63, which is a compression spring. Its top end is fixedly connected to the lower heating plate 67, and its bottom end is connected to the lower heating frame 65. The second lifting component 62 is a second lifting cylinder. The cylinder is fixed on the ground, and the top end of the piston rod is fixedly connected to the lower heating frame 65 through the lower lifting plate 66.

[0082] With the above structure, the upper heating strip 51 can support the lower end of the welding strip 8 placed in the welding gap. When the first pick-and-place component 41 moves to the first working position, the first lifting component 52 drives the upper heating strip 51 and the first negative pressure cover 413 to move down. After the battery cell 7 and welding strip 8 are placed, the lower end of the welding strip 8 is clamped between the battery cell 7 and the upper heating strip 51. The second lifting cylinder is activated to compress the upper elastic element 53 and lock the lower end of the welding strip 8 to the back of the battery cell 7. Then, the upper heating strip 51 is energized and heated to fix the welding strip 8 to the bottom surface of the battery cell 7.

[0083] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hot-press welding device for a gridless photovoltaic module, characterized in that, include: A cell supply and transfer assembly (1) is used to lay flat and transfer the battery cells (7). A tape cutting assembly (2) is provided, comprising a coil (21), a cutting table (22), and a cutting unit (23). The coil (21) is wound with a welding strip (24), and the coil (21) rotates around its own axis to unwind the welding strip (24) and lay it on the cutting table (22). The cutting unit (23) is used to cut the welding strip (24) laid on the cutting table (22) to form a welding strip (8) with a length less than twice the length of the battery cell (7). The welding transfer assembly (3) includes a plurality of conveyor belts (31) distributed along its own width direction and a drive unit for driving the conveyor belts (31) to rotate. A welding gap (32) with a width greater than or equal to the width of the welding strip (8) is provided between two adjacent conveyor belts (31). The negative pressure pick-and-place assembly (4) is used to pick up the battery cell (7) and the welding strip (8) and then place the battery cell (7) flat on the conveyor belt (31) and place the welding strip (8) between two adjacent conveyor belts (31), so that the two ends of the welding strip (8) are respectively above one of the two adjacent battery cells (7) on the conveyor belt (31) and below the other. The upper hot pressing assembly (5) includes an upper hot pressing strip (51) disposed directly above the welding gap (32) and extending in a direction parallel to the length of the welding gap (32), and the upper hot pressing strip (51) is connected to a first lifting assembly (52). The lower hot pressing assembly (6) includes a lower hot pressing strip (61) disposed between two adjacent conveyor belts (31) and extending along the length direction parallel to the welding gap (32), and the lower hot pressing strip (61) is connected to a second lifting assembly (62). The upper hot pressing assembly (5) and the lower hot pressing assembly (6) cooperate with each other to weld the two ends of the welding strip (8) to the front of one of two adjacent battery cells (7) on the conveyor belt (31) and the back of the other, respectively. The sheet feeding and transfer assembly (1), the welding and transfer assembly (3), and the strip cutting assembly (2) are equally spaced along the width direction of the transfer belt (31). The negative pressure pick-and-place assembly (4) includes a first pick-and-place assembly (41) for picking up and placing the battery sheet (7), a second pick-and-place assembly (42) for picking up and placing the welding strip (8), and a translation assembly (43) for driving the first pick-and-place assembly (41) and the second pick-and-place assembly (42) to move along the width direction parallel to the transfer belt (31). The first pick-and-place assembly (41) and the second pick-and-place assembly (42) are spaced along the width direction parallel to the transfer belt (31), and the interval between them is equal to the interval between the sheet feeding and transfer assembly (1) and the welding and transfer assembly (3). The output end of the translation component (43) is connected to the first lifting component (52); the output end of the first lifting component (52) is connected to the first pick-and-place component (41).

2. The hot-press welding apparatus for a gridless photovoltaic module according to claim 1, characterized in that: The upper hot pressing strip (51) is slidably connected to the output end of the first lifting assembly (52) in the vertical direction and an upper elastic element (53) is provided between them; the lower hot pressing strip (61) is slidably connected to the output end of the second lifting assembly (62) in the vertical direction and a lower elastic element (63) is provided between them.

3. The hot-press welding apparatus for gridless photovoltaic modules according to claim 2, characterized in that: The lower hot pressing component (6) is located directly below the moving path of the first pick-and-place component (41).

4. The hot-press welding apparatus for a gridless photovoltaic module according to claim 1, characterized in that: The feeding and conveying assembly (1) includes a conveyor belt (11) and conveying rollers (12) located at both ends of the inner side of the conveyor belt (11); the driving unit is connected to the conveying rollers (12) and the reel (21) in a driving connection.

5. The hot-press welding apparatus for a gridless photovoltaic module according to claim 1, characterized in that: The cutting table (22) is provided with a guide groove (221) extending in a direction parallel to the transmission direction of the conveyor belt (31), and the guide groove (221) is adapted to the welding strip (8).

6. The hot-press welding apparatus for a gridless photovoltaic module according to claim 5, characterized in that: The cutting table (22) is also provided with a strip-shaped through hole (222) extending along the length direction perpendicular to the guide groove (221). The cutting unit (23) includes a cutter (231) disposed inside the strip-shaped through hole (222) and a telescopic unit (232) that drives the cutter (231) to move in the vertical direction. The telescopic unit (232) is disposed below the cutting table (22).

7. The hot-press welding apparatus for a gridless photovoltaic module according to claim 6, characterized in that: A limiting strip (223) is provided above the cutting table (22), the limiting strip (223) spans and fits the groove of the guide groove (221), and the pressure strip is located between the strip-shaped through hole (222) of the wire spool (21).

8. The hot-press welding apparatus for a gridless photovoltaic module according to claim 1, characterized in that: A heat insulation sheet (611) is provided on the side of the lower heat pressing strip (61) adjacent to the conveyor belt (31), and the projection of the heat insulation sheet (611) on the horizontal plane is located within the projection of the welding gap (32) on the horizontal plane.

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