A battery string welding machine and a battery string welding method

Abstract

The application relates to a battery string welding machine which comprises a glue applying part, a battery piece feeding part, a welding strip feeding part, a conveying part and an irradiation part; the glue applying part is used for applying a photosensitive glue point between predetermined busbar lines of a battery piece to form a glue point row on the surface of the battery piece; the battery piece feeding part is used for carrying the battery piece with the glue point row to the conveying part; the welding strip feeding part is used for providing a welding strip group to a receiving station of the conveying part; the conveying part conveys the stacked welding strip group and battery piece to the irradiation part at a welding station; and the irradiation part is used for irradiating the glue point row to fix the welding strip group on the battery piece. The glue applying part is arranged to form the glue point row on the surface of the battery piece, the battery piece feeding part and the welding strip feeding part are arranged to feed and stack the welding strip group and the battery piece, the conveying part is arranged to convey the battery piece and the welding strip group, and the irradiation part is arranged to fix the welding strip on the glue point row of the battery piece, so that the production of the battery string is completed.

Description

Technical Field

[0001] This invention relates to the field of battery production, specifically to a battery string welding machine and a battery string welding method. Background Technology

[0002] Traditional battery string production involves using flux to weld solder strips and battery cells together under high-temperature conditions. The specific steps are: first, flux is applied to the battery cells or solder strips; then, the solder strips and battery cells are stacked together; and finally, a high-temperature infrared welding device is used to heat and melt the tin plating layer on the surface of the solder strips, welding it to the main grid lines made of silver paste printed on the battery cells.

[0003] However, this method consumes a significant amount of silver paste, increasing the cost of the solar module. Furthermore, the silver paste covering the solar cells reduces their light-receiving area, thus impacting the photovoltaic module's photoelectric conversion efficiency.

[0004] Currently, a type of gridless solar cell has emerged on the market, where the solder ribbon is directly connected to the sub-grid lines of the cell for conductive current collection. However, because the sub-grid lines are very thin, the solder ribbon cannot be directly soldered to the sub-grids to connect to the solar cell.

[0005] Therefore, it is necessary to develop a string welding machine and string welding method specifically designed for implementing this type of welding process. Summary of the Invention

[0006] To achieve the above technical objectives, the first aspect of this invention provides a battery string welding machine capable of producing grid-free battery cells in series. The technical solution adopted is as follows:

[0007] A battery string welding machine includes an adhesive application section, a cell loading section, a ribbon loading section, a conveying section, and an irradiation section. The adhesive application section applies photosensitive adhesive dots between predetermined sub-grid lines of the cell to form at least one row of adhesive dots perpendicular to the length direction of the sub-grid lines on the cell surface. The cell loading section transports the cell with the applied adhesive dots to a receiving station in the conveying section. The ribbon loading section provides ribbon sets to the receiving station in the conveying section. The cell loading section and the ribbon loading section stack the ribbon sets and cell sheets according to a predetermined rule at the receiving station in the conveying section, ensuring that the ribbons in the ribbon sets correspond one-to-one with the adhesive dots on the cell sheets. The conveying section transports the stacked ribbon sets and cell sheets to an irradiation section at the welding station. The irradiation section irradiates the adhesive dots to fix the ribbon sets onto the cell sheets.

[0008] The adhesive application section forms adhesive dots on the surface of the solar cells. The solar cell loading section and the ribbon loading section load and stack the ribbon and solar cells. The conveying section transports the solar cells and ribbon. The irradiation section fixes the ribbon to the adhesive dots on the solar cells, thus completing the production of the solar cell string.

[0009] Optionally, the battery string welding machine also includes a clamping and positioning part, which is used to clamp the stacked welding strips and battery cells. The clamping position of the clamping and positioning part is offset from the position of the photosensitive adhesive dots.

[0010] The pressing and positioning part enables the welding strip and battery cells to be pressed and positioned after stacking, thus avoiding the deviation of the welding strip during transportation.

[0011] Optionally, the conveying unit includes a conveying support unit and a conveying drive unit; the drive end of the conveying drive unit is connected to the conveying support unit, and the conveying drive unit is used to drive the conveying support unit to convey the welding strip group and the battery cells. The conveying support unit is made of a light-transmitting material.

[0012] The conveyor unit carries the welding strip and the solar cells, the conveyor drive unit drives the conveyor unit to transport them, and the light-transmitting setting of the carrier unit allows the adhesive dots on the side of the solar cells facing the carrier unit to be irradiated.

[0013] Optionally, the irradiation unit includes at least one of a first irradiation section and a second irradiation section; the first irradiation section is disposed above the conveying surface of the conveying carrier at the welding station, and the first irradiation section is used to irradiate the adhesive dots on the front side of the battery cell; the second irradiation section is disposed below the conveying surface of the conveying carrier at the welding station, and the second irradiation section is used to irradiate the adhesive dots on the back side of the battery cell.

[0014] The first irradiation section irradiates the adhesive dots on the top of the solar cell, while the second irradiation section irradiates the adhesive dots on the back of the solar cell.

[0015] Optionally, the conveying bearing part includes a conveyor belt and a conveying base plate, and the conveying driving part includes a first driving device and a support roller group; the driving end of the first driving device is connected to the support roller group, and the first driving device is used to drive the support roller group to rotate. The conveyor belt is fitted on the support roller group and rotates with the support roller group; the conveying base plate is set below the conveying surface of the conveyor belt and is used to support the conveyor belt; the conveyor belt is a light-transmitting belt and the conveying base plate is a light-transmitting plate.

[0016] The conveyor belt enables the receiving of battery cells and welding strips, the conveyor base plate provides support during the conveyor belt transport process, the first drive device and support roller group provide support for the conveyor belt transport, and the combination of the conveyor belt as a light-transmitting belt and the conveyor base plate as a light-transmitting plate enables the penetration of light from the irradiation unit.

[0017] Optionally, the conveyor belt is provided with a first through hole, and the conveyor base plate is provided with a negative pressure adsorption hole. The negative pressure adsorption hole on the conveyor base plate adsorbs the battery cell onto the conveyor belt through the first through hole on the conveyor belt.

[0018] The negative pressure adsorption holes on the adsorption base plate, through the setting of the first through hole on the conveyor belt, adsorb the battery cells and stick them tightly to the conveyor belt.

[0019] Optionally, the conveying support unit includes a support plate, and the conveying drive unit includes a second drive device; the drive end of the second drive device is connected to the support plate, and the second drive device is used to drive the support plate from the receiving station to the welding station; the support plate is used to support the welding strip group and the battery cell; the support plate is a light-transmitting plate.

[0020] The support plate enables the support of the welding strip assembly and the solar cells. The drive unit enables the movement of the support plate, thereby enabling the transport of the welding strip assembly and the solar cells. The light-transmitting plate of the support unit enables the transmission of light from the irradiation unit.

[0021] Optionally, the conveying section also includes a clamping device, and the support plate is provided with a second through hole for the clamping device to pass through; the clamping device is used to clamp the welding strip group located below the solar cell conveyed by the support plate against the back of the solar cell.

[0022] By setting up a clamping device, the welding strip group under the battery cell can be closely attached to the battery cell when irradiated by the irradiation unit, thus improving the welding effect.

[0023] Optionally, the clamping and positioning part includes a mounting frame and a row of pressure pins mounted on the mounting frame. The row of pressure pins is arranged corresponding to the welding strip group, and each row of pressure pins is used to clamp one welding strip.

[0024] The pin array configuration enables better positioning of the solder strip.

[0025] Another aspect of this application provides a battery string welding method, which includes:

[0026] Photosensitive adhesive is applied between predetermined sub-grid lines of the solar cell to form at least one row of adhesive dots perpendicular to the length direction of the sub-grid lines on the surface of the solar cell; a ribbon assembly is provided, wherein the number of ribbons in the ribbon assembly is the same as the number of adhesive dots; the ribbon assembly and the solar cell are stacked according to a predetermined rule, such that the ribbons in the stacked ribbon assembly correspond one-to-one with the adhesive dots on the solar cell; the stacked solar cell and ribbon assembly are illuminated to cause the adhesive dots on the ribbon assembly and the solar cell to adhere together, forming a solar cell string.

[0027] By stacking adhesive dots on the solar cells with the solder ribbon assembly, and then illuminating the stacked solder ribbon assembly and solar cells together, the solder ribbon assembly and solar cells are welded and positioned together, thus completing the production of the battery string.

[0028] Optionally, the ribbon assembly and the solar cells are stacked according to a predetermined rule, including:

[0029] The i-th cell is stacked on the back half of the i-th ribbon group, and the front half of the (i+1)-th ribbon group is stacked on the i-th cell, where i is any natural number greater than 0.

[0030] Optionally, the solder ribbons and solar cells are stacked according to a predetermined rule, including: the solar cells are back-contact solar cells; the first half of the first group of solder ribbons is connected to the positive electrode adhesive dots on the back of the (I-1)th solar cell; the second half of the first group of solder ribbons is connected to the negative electrode adhesive dots on the back of the first solar cell; the first half of the (I+1)th group of solder ribbons is connected to the positive electrode adhesive dots on the back of the first solar cell; and the second half of the (I+1)th group of solder ribbons is connected to the negative electrode adhesive dots on the back of the (I+1)th solar cell. The connection can be made by dot-matrix connection, where I is any odd number greater than 0; or, the first half of the first group of solder ribbons can be connected to the negative electrode adhesive dot-matrix on the back of the (I-1)th cell, and the second half of the first group of solder ribbons can be connected to the positive electrode adhesive dot-matrix on the back of the first cell, and the first half of the (I+1)th group of solder ribbons can be connected to the negative electrode adhesive dot-matrix on the back of the first cell, and the second half of the (I+1)th group of solder ribbons can be connected to the positive electrode adhesive dot-matrix on the back of the (I+1)th cell, where I is any odd number greater than 0.

[0031] The battery string welding machine provided in this application forms adhesive dots on the surface of the battery cells through an adhesive application section, and loads and stacks the solder ribbons and battery cells through a battery cell loading section and a solder ribbon loading section. A conveying section transports the battery cells and solder ribbons, and an irradiation section fixes the solder ribbons to the adhesive dots on the battery cells, thus completing the production of the battery string. On the other hand, the battery string welding method provided in this application applies photosensitive adhesive to the surface of the battery cells and then stacks the solder ribbons, utilizing light irradiation to achieve the string welding production of the battery cells. Attached Figure Description

[0032] Figure 1 This is a top view of a battery string welding machine according to an optional embodiment of the present invention.

[0033] Figure 2 for Figure 1 Side view.

[0034] Figure 3 This is a perspective view of a battery string welding machine according to an optional embodiment of the present invention.

[0035] Figure 4 for Figure 3 Side sectional view.

[0036] The accompanying diagrams are labeled as follows:

[0037] 1. Conveying section; 2. Welding strip assembly; 3. Pressing and positioning section; 4. First irradiation section; 5. Second irradiation section; 6. Conveyor belt; 7. Conveying base plate; 8. Support plate; 9. Tightening device; 10. Second through hole; 11. Pressing needle row. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] This invention is a battery string welding machine for welding gridless battery cells.

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a battery string welding machine in the first aspect. The battery string welding machine includes an adhesive application section, a battery cell loading section, a solder strip loading section, a conveying section 1, and an irradiation section. The adhesive application section is used to apply photosensitive adhesive dots between predetermined sub-grid lines of the battery cell to form at least one row of adhesive dots perpendicular to the length direction of the sub-grid lines on the surface of the battery cell. The battery cell loading section is used to transport the battery cell with the applied adhesive dots to the receiving station of the conveying section 1. The solder strip loading section is used to provide a solder strip group 2 to the receiving station of the conveying section 1. The battery cell loading section and the solder strip loading section stack the solder strip group 2 and the battery cell on the receiving station of the conveying section 1 according to a predetermined rule, such that the solder strip in the solder strip group 2 and the adhesive dots on the battery cell are placed in a one-to-one correspondence. The conveying section 1 conveys the stacked solder strip group 2 and the battery cell to the irradiation section at the welding station. The irradiation section is used to irradiate the adhesive dots to fix the solder strip group 2 to the battery cell.

[0041] The adhesive application section forms adhesive dots on the surface of the battery cells. The battery cell loading section and the ribbon loading section load and stack the ribbon group 2 and the battery cells. The conveying section 1 transports the battery cells and the ribbon group 2. The irradiation section fixes the ribbon to the adhesive dots on the battery cells, thus completing the production of the battery string.

[0042] In one implementation, the adhesive application section can use a nozzle to directly spray photosensitive adhesive dots between predetermined negative grid lines of the solar cell, or apply photosensitive adhesive dots by nozzle dispensing, or screen printing.

[0043] When applying photosensitive adhesive dots, they can be applied between each adjacent sub-grid line, or one photosensitive adhesive dot can be applied every two sub-grid lines, or the spacing between sub-grid lines can be adjusted to apply photosensitive adhesive dots as needed. The photosensitive adhesive dots are arranged in rows along a direction perpendicular to the sub-grid lines of the solar cell, and multiple sets of parallel rows of adhesive dots can be applied to a single solar cell.

[0044] The battery cell loading process includes a robotic arm, whose drive end is equipped with a suction cup for adsorbing battery cells. The robotic arm drives the suction cup to adsorb and place the battery cells.

[0045] The ribbon loading section includes a ribbon loading moving device and a ribbon chuck. The ribbon chuck is used to hold the ribbon group 2, and the ribbon moving device is used to drive the ribbon chuck to hold the ribbon and place it onto the battery cell, so that the ribbons in the ribbon group 2 are placed one-to-one with the adhesive dots. To prevent the adhesive dots from sticking to the conveyor 1 when the battery cell is placed on it, the thickness of the adhesive dots is smaller than the diameter of the ribbons in the ribbon group 2.

[0046] The conveying unit 1 conveys the stacked welding ribbon group 2 and the battery cells to the irradiation unit. The irradiation unit irradiates the adhesive dots on the battery cells, causing the adhesive dots to solidify, thereby bonding the welding ribbon and the battery cells together to form a battery string.

[0047] In one implementation, if the electrodes of the solar cell are located on two sides of the solar cell, then when stacking the solar cells and solder ribbons, the first set of solder ribbons needs to be placed first, and then the first solar cell is placed on the latter half of the first set of solder ribbons, so that the adhesive dots on the back of the first solar cell correspond one-to-one with the solder ribbons. Then, the second set of solder ribbons is placed, so that the front half of the second set of solder ribbons is placed on the front of the first solar cell and corresponds one-to-one with the adhesive dots on the front of the first solar cell. Then, the second solar cell is placed on the latter half of the second set of solder ribbons, so that the adhesive dots on the back of the second solar cell correspond one-to-one with the second set of solder ribbons. This process is repeated until the last solar cell is placed. Then, the last set of solder ribbons is placed on the last solar cell, so that the front half of the last set of solder ribbons corresponds one-to-one with the adhesive dots on the last solar cell.

[0048] If the solar cell is a back-contact solar cell, meaning the positive and negative electrodes of the solder ribbon are both on the back side of the cell, then the adhesive dots applied between the negative electrode sub-grid lines on the back side of the cell form the sub-electrode adhesive dot array, and the adhesive dots applied between the positive electrode sub-grid lines form the positive electrode adhesive dot array. During arrangement, the solar cells should first be arranged back-side up on the conveyor unit 1, and then the solder ribbon assembly should be placed on the solar cells. One end of the solder ribbon assembly connects to the sub-electrode adhesive dot array of the adjacent solar cell, and the other end connects to the positive electrode adhesive dot array of another adjacent solar cell. Alternatively, the solder ribbon can be arranged on the conveyor unit 1 first, and then the solar cells can be placed back-side down on the solder ribbon, so that one end of the solder ribbon assembly connects to the sub-electrode adhesive dot array of the adjacent solar cell, and the other end connects to the positive electrode adhesive dot array of another adjacent solar cell.

[0049] Then, the conveying unit 1 carries the stacked welding ribbon group 2 and the battery cells to the irradiation unit. The irradiation unit is located on the side of the conveying unit 1 in the conveying direction. The irradiation unit irradiates the battery cells conveyed by the conveying unit 1, so that the adhesive dots on the battery cells are cured after being exposed to light, thus connecting the welding ribbon group 2 and the battery cells together to form a battery string.

[0050] In one implementation, the photosensitive adhesive is a UV-curable adhesive, and the irradiation light from the irradiation unit is UV light. The irradiation unit enables the low-temperature connection of the solar cells and solder ribbons into a series, reducing energy loss and preventing damage to the solar cells from high temperatures.

[0051] In one implementation, in order to achieve better adhesion between the welding ribbon and the battery cell and to avoid displacement of the welding ribbon relative to the battery cell during transportation, the battery string welding machine also includes a pressing and positioning part 3. The pressing and positioning part 3 is used to press the stacked welding ribbon group 2 and the battery cell together. At the same time, in order to avoid the pressing and positioning part 3 blocking the light, the pressing position of the pressing and positioning part 3 is offset from the position of the photosensitive adhesive dot.

[0052] In one implementation, the clamping and positioning part 3 is a reusable tooling. The clamping and positioning part 3 is located at the beginning of the conveying part 1. The battery cell loading part may also include a clamping and positioning gripper, which is used to simultaneously grip the battery cell and the clamping and positioning part 3, thereby enabling the loading of the clamping and positioning part 3. The clamping and positioning part 3 moves synchronously to the irradiation part along with the welding strip group 2 and the battery cell under the conveying of the conveying part 1.

[0053] The pressing and positioning part enables the welding strip and battery cells to be pressed and positioned after stacking, thus avoiding the deviation of the welding strip during transportation.

[0054] In one implementation, the conveying unit 1 includes a conveying support unit and a conveying drive unit; the drive end of the conveying drive unit is connected to the conveying support unit, and the conveying drive unit is used to drive the conveying support unit to convey the welding strip group 2 and the battery cell; the conveying support unit is made of a light-transmitting material.

[0055] Specifically, the light-transmitting material of the conveyor belt should be able to transmit at least ultraviolet light. The material of the conveyor belt can be glass or acrylic.

[0056] The conveyor unit carries the welding strip group 2 and the battery cells, the conveyor drive unit drives the conveyor unit to transport the battery cells, and the light-transmitting setting of the carrier unit allows the adhesive dots on the side of the battery cells facing the carrier unit to be irradiated.

[0057] In one implementation, the irradiation unit includes at least one of a first irradiation section 4 and a second irradiation section 5; the first irradiation section 4 is disposed above the conveying surface of the conveying carrier at the welding station, and the first irradiation section 4 is used to irradiate the adhesive dots on the front side of the battery cell; the second irradiation section 5 is disposed below the conveying surface of the conveying carrier at the welding station, and the second irradiation section 5 is used to irradiate the adhesive dots on the back side of the battery cell.

[0058] When it is necessary to irradiate both sides of the battery cell, the irradiation unit includes a first irradiation section 4 and a second irradiation section 5. When it is necessary to irradiate the top or bottom of the battery cell, the first irradiation section 4 or the second irradiation section 5 can be used as needed.

[0059] Both the first irradiation section 4 and the second irradiation section 5 are ultraviolet lamps.

[0060] The first irradiation section 4 irradiates the adhesive dots on the top of the solar cell, and the second irradiation section 5 irradiates the adhesive dots on the back of the solar cell.

[0061] In one implementation, the conveying bearing part includes a conveyor belt 6 and a conveying base plate 7, and the conveying driving part includes a first driving device and a support roller group; the driving end of the first driving device is connected to the support roller group, and the first driving device is used to drive the support roller group to rotate, the conveyor belt 6 is fitted on the support roller group, and the conveyor belt 6 rotates with the support roller group; the conveying base plate 7 is disposed below the conveying surface of the conveyor belt 6, and the conveying base plate 7 is used to support the conveyor belt 6; the conveyor belt 6 is a light-transmitting belt, and the conveying base plate 7 is a light-transmitting plate.

[0062] In one implementation, the conveyor belt 6 is a Teflon belt that is transparent to ultraviolet light.

[0063] The conveyor belt 6 enables the receiving of battery cells and welding strip group 2. The conveyor base plate 7 provides support for the conveyor belt 6 during the conveying process. The first drive device and support roller group provide support for the conveyor belt 6 during conveying. The conveyor belt 6 is a light-transmitting belt and the conveyor base plate 7 is a light-transmitting plate, which enables the penetration of light from the irradiation section.

[0064] In one implementation, the conveyor belt 6 is provided with a first through hole, and the conveyor base plate 7 is provided with a negative pressure adsorption hole. The negative pressure adsorption hole on the conveyor base plate 7 adsorbs the battery cells onto the conveyor belt 6 through the first through hole on the conveyor belt 6.

[0065] The first through hole on the conveyor belt 6 enables the negative pressure adsorption holes on the adsorption base plate to adsorb and adhere the battery cells to the conveyor belt 6.

[0066] In one implementation, such as Figure 3 and Figure 4 As shown, the conveying and carrying part includes a support plate 8, and the conveying and driving part includes a second driving device; the driving end of the second driving device is connected to the support plate 8, and the second driving device is used to drive the support plate 8 from the receiving station to the welding station; the support plate 8 is used to carry the welding strip group 2 and the battery cell; the support plate 8 is a light-transmitting plate.

[0067] The support plate 8 supports the ribbon group 2 and the battery cells, the drive unit moves the support plate, and the ribbon group 2 and the battery cells are transported. The light-transmitting plate of the support unit allows the light from the irradiation unit to pass through.

[0068] In one implementation, such as Figure 4 As shown, the conveying section 1 also includes a clamping device 9, and the support plate 8 is provided with a second through hole 10 for the clamping device 9 to pass through; the clamping device 9 is used to clamp the welding strip group 2 located below the battery cell conveyed by the support plate 8 against the back of the battery cell.

[0069] In one implementation, the clamping device 9 is an elastic pin, which is installed on the lifting device. When no work is required, the lifting device drives the elastic pin to descend. When irradiation welding is required, the lifting device drives the elastic pin to rise. The pin elastically presses the welding strip onto the back of the battery cell, thereby ensuring that the welding strip is close to the battery cell during irradiation welding and improving the welding quality of the battery string.

[0070] By setting up the clamping device 9, the welding strip group 2 under the battery cell can be tightly attached to the battery cell when irradiated by the irradiation unit, thus improving the welding effect.

[0071] In one implementation, the clamping and positioning part 3 includes a mounting frame and a row of pressure pins 11 mounted on the mounting frame. The row of pressure pins 11 is arranged corresponding to the welding strip group 2, and each row of pressure pins 11 is used to clamp one welding strip.

[0072] Each needle row 11 contains at least two resilient needles.

[0073] The setting of the pressure pin row 11 enables better positioning of the solder strip.

[0074] Another aspect of this application provides a battery string welding method, which includes:

[0075] Photosensitive adhesive is applied between predetermined sub-grid lines of the solar cell to form at least one row of adhesive dots perpendicular to the length direction of the sub-grid lines on the surface of the solar cell; a ribbon group 2 is provided, wherein the number of ribbons in the ribbon group 2 is the same as the number of adhesive dots; the ribbon group 2 and the solar cell are stacked according to a predetermined rule, such that the ribbons in the stacked ribbon group 2 correspond one-to-one with the adhesive dots on the solar cell; the stacked solar cell and the ribbon group 2 are illuminated to cause the adhesive dots on the ribbon group 2 and the solar cell to adhere together to form a battery string.

[0076] In one implementation, the photosensitive adhesive used in this method is a UV-curable adhesive, and the illumination is UV light. By using UV-cured adhesive and UV light, the battery cells and solder ribbons are bonded together at low temperatures to form a battery string, reducing energy loss and effectively avoiding heat damage to the battery cells during high-temperature welding. This significantly improves the quality of the produced battery strings.

[0077] By stacking the adhesive dots on the solar cell with the solder ribbon group 2, and then illuminating the stacked solder ribbon group 2 and solar cell, the solder ribbon group 2 and solar cell are welded and positioned together, thus completing the production of the battery string.

[0078] In one implementation, the ribbon group 2 and the solar cells are stacked according to a predetermined rule, including:

[0079] The i-th battery cell is stacked on the back half of the i-th ribbon group 2, and the front half of the (i+1)-th ribbon group 2 is stacked on the i-th battery cell, where i is any natural number greater than 0.

[0080] To ensure effective compression, a compression and positioning unit can be placed above the stacked ribbon and cell bundles to press them together. The compression and positioning unit includes a frame and a row of pressure pins mounted on the frame, with each pressure pin corresponding to a ribbon in the ribbon bundle.

[0081] In one implementation, the solder ribbon group 2 and the battery cell are stacked according to a predetermined rule, including: the battery cell is a back contact battery cell. Because the battery cell is a back contact battery cell, the positive and negative electrodes of the battery cell are integrated to the back side of the battery cell. Therefore, when applying photosensitive adhesive, it is only necessary to apply positive electrode adhesive dots between the negative grid lines corresponding to the positive electrode on the back side of the battery cell, and apply negative electrode adhesive dots between the sub-grid lines corresponding to the negative electrode on the back side of the battery cell.

[0082] When stacking the ribbon assembly and the back contact cell, you can place the ribbon assembly first, then the cell, and finally place the clamping and positioning part on top of the cell to clamp and position the ribbon assembly and cell together; or you can place the cell first, then the ribbon assembly, and then place the clamping and positioning part to clamp the ribbon assembly and cell together.

[0083] The clamping and positioning part includes a frame and a row of pressure pins mounted on the frame, with the row of pressure pins placed one-to-one with the welding strips in the welding strip group.

[0084] The process of stacking back-contact solar cells and solder ribbons includes: connecting the first half of the first group of solder ribbons to the positive electrode adhesive dot array on the back of the (I-1)th solar cell, connecting the second half of the first group of solder ribbons to the negative electrode adhesive dot array on the back of the first solar cell, connecting the first half of the (I+1)th group of solder ribbons to the positive electrode adhesive dot array on the back of the first solar cell, and connecting the second half of the (I+1)th group of solder ribbons to the negative electrode adhesive dot array on the back of the (I+1)th solar cell, where I is any odd number greater than 0; or, connecting the first half of the first group of solder ribbons to the negative electrode adhesive dot array on the back of the (I-1)th solar cell, connecting the second half of the first group of solder ribbons to the positive electrode adhesive dot array on the back of the first solar cell, connecting the first half of the (I+1)th group of solder ribbons to the negative electrode adhesive dot array on the back of the first solar cell, and connecting the second half of the (I+1)th group of solder ribbons to the positive electrode adhesive dot array on the back of the (I+1)th solar cell, where I is any odd number greater than 0.

[0085] The battery string welding machine provided in this application forms adhesive dots on the surface of the battery cells through an adhesive application section. It loads and stacks the solder ribbon assembly 2 and the battery cells through a battery cell loading section and a solder ribbon loading section. The conveying section 1 transports the battery cells and solder ribbon assembly 2. The irradiation section fixes the solder ribbon to the adhesive dots on the battery cells, thus completing the production of the battery string. On the other hand, the battery string welding method provided in this application applies photosensitive adhesive to the surface of the battery cells and then stacks the solder ribbon, utilizing light irradiation to achieve the string welding production of the battery cells.

[0086] The present invention has been described above in sufficient detail and with certain specificities. Those skilled in the art should understand that the descriptions in the embodiments are merely exemplary, and all changes made without departing from the true spirit and scope of the invention should fall within the protection scope of the invention. The scope of protection claimed by the present invention is defined by the claims, and not by the above descriptions in the embodiments.

Claims

1. A battery string welding machine, characterized in that, The battery string welding machine includes a glue application section, a battery cell feeding section, a welding strip feeding section, a conveying section, and an irradiation section; The adhesive application section is used to apply photosensitive adhesive dots between predetermined sub-grid lines of the solar cell to form at least one row of adhesive dots perpendicular to the length direction of the sub-grid lines on the surface of the solar cell. The battery cell loading section is used to transport the battery cells with glue dots applied to them to the receiving station of the conveying section; The welding strip feeding section is used to provide welding strip sets to the receiving station of the conveying section; The cell loading section and the ribbon loading section stack the ribbon group and the cell on the receiving station of the conveying section according to a predetermined rule, and place the ribbon in the ribbon group and the glue dots on the cell in a one-to-one correspondence. The conveying unit transports the stacked welding strips and the battery cells to the irradiation unit at the welding station; The irradiation section is used to irradiate the adhesive dots to fix the solder ribbon assembly to the battery cell; The conveying unit includes a conveying support unit and a conveying drive unit; the drive end of the conveying drive unit is connected to the conveying support unit, and the conveying drive unit is used to drive the conveying support unit to convey the welding strip group and the battery cell; the conveying support unit is made of a light-transmitting material. The battery string welding machine also includes a pressing and positioning part, which is used to press the stacked welding strip group and the battery cell together. The pressing position of the pressing and positioning part is offset from the position of the photosensitive adhesive dots. The irradiation section includes at least one of a first irradiation section and a second irradiation section; The first irradiation section is located above the conveying surface of the conveying carrier at the welding station, and the first irradiation section is used to irradiate the glue dot array on the front side of the battery cell. The second irradiation section is located below the conveying surface of the conveying carrier at the welding station, and the second irradiation section is used to irradiate the adhesive dots on the back of the battery cell.

2. The battery string welding machine as described in claim 1, characterized in that, The conveying bearing part includes a conveyor belt and a conveying base plate, and the conveying driving part includes a first driving device and a support roller group; The drive end of the first drive device is connected to the support roller group, and the first drive device is used to drive the support roller group to rotate. The conveyor belt is fitted onto the support roller assembly, and the conveyor belt rotates with the support roller assembly; The conveyor base plate is disposed below the conveyor surface of the conveyor belt, and the conveyor base plate is used to support the conveyor belt; The conveyor belt is a light-transmitting belt, and the conveyor base plate is a light-transmitting plate.

3. The battery string welding machine as described in claim 2, characterized in that, The conveyor belt is provided with a first through hole, and the conveyor base plate is provided with a negative pressure adsorption hole. The negative pressure adsorption hole on the conveyor base plate adsorbs the battery cell onto the conveyor belt through the first through hole on the conveyor belt.

4. The battery string welding machine as described in claim 1, characterized in that, The conveying support unit includes a support plate, and the conveying drive unit includes a second drive device; The drive end of the second drive device is connected to the support plate, and the second drive device is used to drive the support plate from the receiving station to the welding station; The support plate is used to support the welding strip assembly and the battery cells; The support plate is a light-transmitting plate.

5. The battery string welding machine as described in claim 4, characterized in that, The conveying section also includes a clamping device, and the support plate is provided with a second through hole for the clamping device to pass through; The clamping device is used to clamp the welding strip group located below the battery cell, which is conveyed by the support plate, to the back of the battery cell.

6. The battery string welding machine as described in claim 1, characterized in that, The clamping and positioning part includes a mounting frame and a row of pressure pins mounted on the mounting frame. The pressure pin row is arranged correspondingly to the welding strip group, and each pressure pin row is used to press one welding strip.

7. A method for welding battery strings, characterized in that, The battery string welding method, using the battery string welding machine as described in any one of claims 1-6, comprises: Photosensitive adhesive is applied between predetermined sub-busbars of the solar cell to form at least one row of adhesive dots on the surface of the solar cell that is perpendicular to the length direction of the sub-busbars. Provide solder strip sets, in which the number of solder strips is the same as the number of adhesive dots; The ribbon assembly and the solar cells are stacked according to a predetermined rule, so that the ribbons in the stacked ribbon assembly correspond one-to-one with the adhesive dots on the solar cells. The stacked solar cells and solder ribbons are exposed to light so that the adhesive dots on the solder ribbons and solar cells adhere together to form a battery string.

8. The battery string welding method according to claim 7, characterized in that, The stacking of the ribbon assembly and the solar cells according to a predetermined rule includes: The i-th cell is stacked on the back half of the i-th ribbon group, and the front half of the (i+1)-th ribbon group is stacked on the i-th cell, where i is any natural number greater than 0.

9. The battery string welding method according to claim 7, characterized in that, The stacking of the solder ribbon assembly and the battery cells according to a predetermined rule includes: the battery cells being back-contact battery cells. The first half of the first group of solder ribbons is connected to the positive electrode adhesive dots on the back of the (I-1)th solar cell, and the second half of the first group of solder ribbons is connected to the negative electrode adhesive dots on the back of the first solar cell. The first half of the (I+1)th group of solder strips is connected to the positive electrode adhesive dot array on the back of the I-th cell, and the second half of the (I+1)th group of solder strips is connected to the negative electrode adhesive dot array on the back of the (I+1)th cell, where I is any odd number greater than 0. or, The first half of the first group of solder ribbons is connected to the negative electrode adhesive dots on the back of the (I-1)th solar cell, and the second half of the first group of solder ribbons is connected to the positive electrode adhesive dots on the back of the first solar cell. The first half of the (I+1)th group of solder strips is connected to the negative electrode adhesive dots on the back of the I-th cell, and the second half of the (I+1)th group of solder strips is connected to the positive electrode adhesive dots on the back of the (I+1)th cell, where I is any odd number greater than 0.

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