A main grid-free battery cell series connection device

Abstract

The present application provides a busbar-free battery cell series connection device, including a series connection conveying device, a soldering tape supply device, a first laying device, a second laying device and a laser heating device. The first laying device is configured to lay the i+1th back adhesive film to a laying position, and to lay the i+1th soldering tape group to the first laying position and the second laying position. The second laying device is configured to lay the i+1th battery cell to the first laying position, and the first laying device is also configured to lay the i-th front adhesive film on the i-th battery cell. The laser heating device is configured to perform laser heating on the i-th battery cell, so that after the i-th front adhesive film releases its viscosity, the first half of the i+1th soldering tape group is bonded to the front of the i-th battery cell. The present application bonds the soldering tape to the battery cell through the adhesive film, thereby improving the bonding force between the soldering tape and the battery cell and preventing the soldering tape from detaching from the battery cell during transportation.

Description

Technical Field

[0001] The present application relates to the field of battery production, and more specifically to a busbar-free battery cell series connection device. Background Art

[0002] Conventional solar cells have side grid lines extending laterally and main grid lines extending longitudinally on the front and back sides for collecting current. The width of the main grid lines is much wider than that of the side grid lines.

[0003] Since a large amount of the cell surface area is occupied by the busbars, the light receiving area of ​​the cell is greatly reduced, which ultimately limits the photoelectric conversion efficiency of the cell. In view of this, the industry has proposed a new type of busbar-free (0BB) cell, which only has thin busbars on the front and back of the busbar-free cell. Compared with traditional cells, the photoelectric conversion efficiency of the busbar-free cell is significantly improved. In addition, since there is no busbar, the amount of silver paste used is reduced, and the cost of the cell is also greatly reduced.

[0004] However, since there is no main grid on the cell, in order to realize the extraction of the current collected by all the fine grid lines on the cell, the welding ribbon is required to be in contact and conductive with each fine grid line. Since the fine grid lines are relatively thin, the welding ribbon and the fine grid lines cannot form a firm connection after welding using the traditional series connection method. The bonding force between the welding ribbon and the fine grid lines is very poor, and the welding ribbon is easy to separate from the fine grid lines during the subsequent battery string transportation process, which ultimately reduces the production quality of the battery assembly.

[0005] In order to solve the problem of poor bonding strength between the welding tape and the fine grid lines of the non-busbar battery cell in the traditional serial connection method, the current solution is to intersperse the back adhesive film and the front adhesive film during the process of laying the non-busbar battery cells into strings. After the battery cells are laid into strings, the serial connection conveying device sequentially conveys the laid battery cells to the bottom of the hot pressing device, and the hot pressing device hot presses the battery cells so that the back adhesive film and the front adhesive film fully release the viscosity, and then the rear half and the front half of the welding tape are respectively bonded to the corresponding battery cells. Since the bonding strength of the adhesive film is greater than the connection force after the welding tape and the fine grid lines of the non-busbar battery cell are welded, it can avoid the welding tape and the battery cell from being separated during the transportation process after the string is formed. During the subsequent lamination, the welding connection between the welding tape and the battery cell can be achieved by low-temperature welding.

[0006] However, the bonding strength between the front adhesive film laid on the front side of the battery cell and the front side of the battery cell is relatively weak. During the process of the stringing conveying device conveying the battery cell to the hot pressing device, due to equipment vibration and other reasons, the front adhesive film can easily separate from the battery cell, causing the front half of the welding tape to move, ultimately affecting the stringing quality of the battery string. Utility Model Content

[0007] In order to solve the above technical problems, the present application provides a busbar-free solar cell series connection device and a manufacturing method, which adopts the following technical solutions:

[0008] A busbarless battery cell series connection device is used to connect battery cells in series into battery strings. The battery cells are busbarless battery cells. The busbarless battery cell series connection device includes a series connection conveying device, a welding ribbon supply device, a first laying device, a second laying device and a laser heating device, wherein:

[0009] The serial conveying device is provided with a first laying position and a second laying position, and the serial conveying device sequentially conveys through the first laying position and the second laying position;

[0010] The welding ribbon supply device is used for supplying the welding ribbon group;

[0011] The first laying device is configured to lay the (i+1)th back adhesive film on the vacated first laying position;

[0012] The first laying device is further configured to lay the i+1th welding ribbon group toward the first laying position and the second laying position, wherein the second half of the i+1th welding ribbon group is placed on the i+1th back adhesive film, and the first half of the i+1th welding ribbon group is placed on the i-th battery cell located at the second laying position;

[0013] The second laying device is configured to lay the i+1th battery cell toward the first laying position, and the i+1th back side adhesive film adheres the second half of the i+1th welding ribbon group to the back side of the i+1th battery cell; the first laying device is also configured to lay the i-th front side adhesive film on the i-th battery cell;

[0014] The laser heating device is arranged above the serial conveying device, and the laser heating device is configured to perform laser heating on the i-th battery cell before or after laying the i-th front adhesive film, so that the first half of the i+1-th welding ribbon group is bonded to the front side of the i-th battery cell after the i-th front adhesive film releases its viscosity;

[0015] The serial conveying device is configured to step forward a predetermined distance toward the back track, so that the i+1th battery cell and the i+1th back adhesive film step from the first laying position to the second laying position to vacate the first laying position;

[0016] Here, i is an integer ≥1.

[0017] The present application provides a busbarless battery cell stringing machine, which interweaves the laying of the back adhesive film and the front adhesive film during the laying and stacking process of the busbarless battery cell and the welding tape, so that the corresponding welding tape segment can be bonded to the battery cell after the adhesive film is laid. Since the bonding strength of the adhesive film is greater than the connection force after the welding tape and the busbarless battery cell are welded, it can avoid the welding tape and the battery cell from being separated during the transportation process after stringing. In particular, before laying the front adhesive film on the front of the battery cell or after laying the front adhesive film, the laser heating device heats the battery cell, so that the front adhesive film can fully release its viscosity after being heated, so that the front half of the corresponding welding tape group is more firmly bonded to the upper surface of the corresponding battery cell, preventing the front adhesive film from being separated from the battery cell during transportation.

[0018] In some embodiments, the laser heating device includes a driving mechanism and a laser, wherein: the laser is connected to the driving end of the driving mechanism, and the laser is configured to emit laser toward the i-th battery cell to form a laser spot on the i-th battery cell; the driving mechanism is configured to drive the laser to move so that the laser spot scans across the front of the i-th battery cell.

[0019] The laser is driven by a driving mechanism to scan the front side of the i-th battery cell, so that the laser can uniformly heat the i-th battery cell or the i-th front adhesive film laid on the i-th battery cell, ensuring that the i-th front adhesive film bonds all the solder strips in the corresponding solder strip group to the upper surface of the corresponding battery cell.

[0020] In some embodiments, the laser spot includes at least one circular spot or at least one square spot, the area of ​​the laser spot is smaller than the front area of ​​the i-th battery cell, and the driving mechanism is configured to drive the laser to move so that the laser spot scans across the front of the i-th battery cell along a predetermined path.

[0021] Controlling a circular light spot or a square light spot to perform scanning heating on the front of the cell only requires one laser, which reduces the heating cost. Controlling multiple circular light spots or multiple square light spots to perform scanning heating on the front of the cell simultaneously can shorten the heating time and improve the heating efficiency.

[0022] In some embodiments, the laser spot is a strip spot; the laser spot crosses the front side of the i-th battery cell along the width direction of the solder ribbon group, and the driving mechanism is configured to drive the laser to move so that the laser spot sweeps across the front side of the i-th battery cell along the length direction of the solder ribbon group; or, the laser spot crosses the front side of the i-th battery cell along the length direction of the solder ribbon group, and the driving mechanism is configured to drive the laser to move so that the laser spot sweeps across the front side of the i-th battery cell along the width direction of the solder ribbon group.

[0023] The strip-shaped light spot spans across the battery cell, so the laser spot only needs one scanning stroke to complete the scanning of the front side of the battery cell, shortening the heating time and improving the heating efficiency.

[0024] In some embodiments, the laser spot scans across the front side of the i-th battery cell along the length direction of the solder ribbon group; the laser heating device also includes a shaping mechanism arranged at the emitting end of the laser, and the shaping mechanism is used to shape the laser spot so that a plurality of avoidance gaps are formed on the laser spot, and each avoidance gap is used to avoid a solder ribbon in the solder ribbon group.

[0025] The soldering ribbon is avoided to prevent the soldering ribbon from tinning when the laser spot heats the battery cell or the front adhesive film.

[0026] In some embodiments, the laser heating device includes a laser, which is configured to emit laser toward the serial conveying device to generate a strip-shaped laser spot, and the laser spot extends along the width direction of the solder ribbon group. The length of the laser spot is greater than the length of the battery cell along the width direction of the solder ribbon group. During the stepping of the serial conveying device to the back path, the laser spot scans across the front side of the i-th battery cell along the length direction of the solder ribbon group.

[0027] There is no need to set up a driving mechanism to drive the laser to move. When the serial conveying device steps to the back track, the battery cell passes under the laser, so that the laser spot scans the front of the battery cell.

[0028] In some embodiments, the laser heating device also includes a shaping mechanism arranged at the emitting end of the laser, which is used to shape the laser spot so that a plurality of avoidance gaps are formed on the laser spot, and each avoidance gap is used to avoid a solder strip in the solder strip group.

[0029] The soldering ribbon is avoided to prevent the soldering ribbon from tinning when the laser spot heats the battery cell or the front adhesive film.

[0030] In some embodiments, the weld ribbon supply device includes a weld ribbon supply mechanism, a weld ribbon clamping mechanism, a weld ribbon cutting mechanism and a weld ribbon tail clamp which are arranged in front of the serial conveying device and are arranged in sequence along the conveying direction of the serial conveying device, wherein: the weld ribbon supply mechanism is used to supply multiple parallel weld ribbons; the first laying device is configured to pull multiple weld ribbons, so that the multiple weld ribbons pass through the weld ribbon clamping mechanism, the weld ribbon cutting mechanism and the weld ribbon tail clamp in sequence and then enter the serial conveying device; when the weld ribbon between the weld ribbon cutting mechanism and the first laying device reaches a predetermined length, the weld ribbon clamping mechanism is configured to clamp the weld ribbon, and the weld ribbon cutting mechanism is configured to cut the weld ribbon, so as to obtain a weld ribbon group including multiple weld ribbons with a predetermined length.

[0031] Through the cooperation of the soldering strip supply mechanism, the soldering strip clamping mechanism, the soldering strip cutting mechanism and the soldering strip tail clamp, the soldering strip supply device realizes the automatic supply of the soldering strip group with a predetermined length.

[0032] In some embodiments, the first laying device includes a film supply mechanism, a first laying mechanism, and a second laying mechanism, wherein: the film supply mechanism is used to supply a back film and a front film; the first laying mechanism is used to obtain the back film from the film supply mechanism, and lay the obtained back film to the first laying position; the first laying mechanism is also used to obtain the solder tape group supplied by the solder tape supply device, and lay the obtained solder tape group to the first laying position and the second laying position; the second laying mechanism is used to obtain the front film from the film supply mechanism, and lay the obtained front film on the i-th battery cell.

[0033] The first laying mechanism and the second laying mechanism obtain the back film and the front film from the film supply mechanism respectively, and alternately complete the laying of the back film and the front film, thereby improving the efficiency of film laying. In addition, the first laying mechanism also completes the laying of the welding tape group, thereby making the utilization rate of the motion module higher.

[0034] In some embodiments, the second laying device includes a battery cell conveying mechanism, a detection mechanism, a battery cell transporting mechanism and an NG sheet box, wherein: the battery cell conveying mechanism is used to transport the battery cells toward the serial conveying device, and at least a detection station and a transporting station are sequentially arranged on the conveying path of the battery cell conveying mechanism; the detection mechanism is arranged at the detection station, and is used to perform quality inspection on the battery cells transported to the detection station; the battery cell transporting mechanism is used to pick up the battery cells that have passed the inspection and are transported to the transporting station, and to lay the picked up battery cells that have passed the inspection to the first laying position; the NG sheet box is located at the discharge end of the battery cell conveying mechanism, and is used to recover the NG battery cells that have failed the inspection.

[0035] By configuring the second laying device to include a cell conveying mechanism, a detection mechanism, a cell transporting mechanism and an NG cell material box, it is ensured that the second laying device only lays qualified cells to the first laying position, thereby improving the pass rate of the battery string. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the laying process of a busbar-free battery cell string in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a busbar-free solar cell series connection device in an embodiment of the present application from one perspective;

[0038] Figure 3 It is a structural schematic diagram of a busbar-free solar cell series connection device in an embodiment of the present application from another perspective;

[0039] Figure 4 This is a schematic diagram of the structure of the busbar-free solar cell series connection device in the embodiment of the present application after some components are omitted;

[0040] Figure 5 This is a schematic diagram of the scanning process of the laser spot on the solar cell in the first embodiment of the present application;

[0041] Figure 6 This is a schematic diagram of the scanning process of the laser spot on the solar cell in the second embodiment of the present application;

[0042] Figure 7 This is a schematic diagram of the scanning process of the laser spot on the solar cell in the third embodiment of the present application;

[0043] Figure 8 This is a schematic diagram of the scanning process of the laser spot on the solar cell in the fourth embodiment of the present application;

[0044] Fig. 9 This is a schematic diagram of the setting orientation of the laser heating device in the fourth embodiment of the present application.

[0045] Figures 1 to 9 Included:

[0046] Serial conveying device 1;

[0047] Welding strip supply device 2;

[0048] The first laying device 3: a film supply mechanism 31, a first laying mechanism 32, and a second laying mechanism 33;

[0049] The second laying device 4: a cell conveying mechanism 41, a detection mechanism 42, and a cell handling mechanism 43;

[0050] Laser heating device 5. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0052] The busbar-free battery cell string welding device provided in this application is used to connect busbar-free battery cells (hereinafter referred to as battery cells) in series into battery strings. Figures 1 to 3 As shown, the busbar-free cell series connection device in the embodiment of the present application includes a series connection conveying device 1, a welding ribbon supply device 2, a first laying device 3, a second laying device 4 and a laser heating device 5, wherein:

[0053] A first laying position A and a second laying position B are provided on the serial conveying device 1, and the serial conveying device 1 conveys through the first laying position A and the second laying position B in sequence.

[0054] The soldering ribbon supply device 2 is used to supply a soldering ribbon group.

[0055] The first laying device 3 is configured to lay the (i+1)th back surface adhesive film on the vacated first laying position A.

[0056] The first laying device 3 is also configured to lay the i+1th welding ribbon group to the first laying position A and the second laying position B, wherein the second half of the i+1th welding ribbon group is placed on the i+1th back side adhesive film, and the first half of the i+1th welding ribbon group is placed on the i-th battery cell located at the second laying position B.

[0057] The second laying device 4 is configured to lay the i+1th cell toward the first laying position A, and the i+1th back adhesive film adheres the second half of the i+1th welding ribbon group to the back of the i+1th cell. The first laying device 3 is also configured to lay the i-th front adhesive film on the i-th cell.

[0058] The laser heating device 5 is arranged above the serial conveying device 1, and the laser heating device 5 is configured to perform laser heating on the i-th cell before or after laying the i-th front adhesive film, so that the i-th front adhesive film releases its viscosity and then the first half of the i+1-th welding tape group is bonded to the front of the i-th cell. Of course, if the laser heating device 5 performs laser heating on the i-th cell before laying the i-th front adhesive film, then after laying the i-th front adhesive film on the i-th cell, the i-th cell heats the i-th front adhesive film so that the i-th front adhesive film releases its viscosity. If the laser heating device 5 performs laser heating on the i-th cell after laying the i-th front adhesive film, then the i-th front adhesive film is directly laser heated so as to release or preliminarily release its viscosity.

[0059] The serial conveying device is configured to step a predetermined distance toward the back track, so that the i+1th battery cell and the i+1th back adhesive film step from the first laying position to the second laying position to vacate the first laying position A.

[0060] Here, i is an integer ≥1.

[0061] In order to enable those skilled in the art to more clearly understand the working process of the busbar-free battery cell series connection device in the embodiment of the present application, the following will be combined with Figure 1 , the process of laying out the battery cell 30, the welding ribbon group 20, the back adhesive film 10 and the front adhesive film 40 in the embodiment of the present application is described as follows:

[0062] like Figure 1 As shown in (a) in the figure, in the initial state, the first laying position A and the second laying position B of the serial conveying device 1 are both in an empty state.

[0063] like Figure 1 As shown in (b) in FIG. 8 , the first laying device 3 lays the first back adhesive film 10 toward the first laying position A.

[0064] like Figure 1 As shown in (c), the first laying device 3 lays the first welding tape group 20 to the first laying position A and the second laying position B, wherein: the rear half of the first welding tape group 20 is placed on the first back adhesive film 10, and the front half of the first welding tape group 20 is placed on the serial conveying device 1.

[0065] like Figure 1 As shown in (d) , the second laying device 4 lays the first battery cell 30 toward the first laying position A, and the first backside adhesive film 10 adheres the second half of the first solder tape group 20 to the backside of the first battery cell 30 .

[0066] like Figure 1 As shown in (e) in FIG. 1 , the serial conveying device 1 steps forward a predetermined distance to the rear path, so that the first battery cell 30 and the first back adhesive film 10 step from the first laying position A to the second laying position B, so as to vacate the first laying position A. Then, the first laying device 3 lays the second back adhesive film 10 to the first laying position A.

[0067] like Figure 1 As shown in (f), the first laying device 3 lays the second welding ribbon group 20 toward the first laying position A and the second laying position B, wherein: the rear half of the second welding ribbon group 20 is placed on the second back adhesive film 10, and the front half of the second welding ribbon group 20 is placed on the first battery cell 30 located at the second laying position B.

[0068] like Figure 1 As shown in (g), the second laying device 4 lays the second battery cell 30 to the first laying position A, and the second back adhesive film 10 adheres the second half of the second welding tape group 20 to the back of the second battery cell 30. The first laying device 3 lays the first front adhesive film 40 to the second laying position B, and the first front adhesive film 40 adheres the first half of the second welding tape group 20 to the front of the first battery cell 30. In order to improve the laying efficiency, the second battery cell and the first front adhesive film can be laid at the same time. In addition, before laying the first front adhesive film 40 or after laying the first front adhesive film 40, the laser heating device 5 is controlled to perform laser heating on the first battery cell 30, so that the first front adhesive film 40 fully releases its viscosity after being heated.

[0069] like Figure 1As shown in (h) in FIG. 1 , the serial conveying device 1 steps forward a predetermined distance to the rear path, so that the second battery cell 30 and the second back adhesive film 10 step from the first laying position A to the second laying position B, thereby freeing up the first laying position A. Then, the first laying device 3 lays the third back adhesive film 10 to the first laying position A.

[0070] like Figure 1 As shown in (i), the first laying device 3 lays the third welding ribbon group 20 toward the first laying position A and the second laying position B, wherein: the rear half of the third welding ribbon group 20 is placed on the third back side adhesive film 10, and the front half of the third welding ribbon group 20 is placed on the second battery cell 30 located at the second laying position B.

[0071] like Figure 1 As shown in (j), the second laying device 4 lays the third battery cell 30 toward the first laying position A, and the third back adhesive film 10 adheres the rear half of the third welding tape group 20 to the back of the third battery cell 30. The first laying device 3 lays the second front adhesive film 40 toward the second laying position B, and the second front adhesive film 40 adheres the front half of the third welding tape group 20 to the front of the second battery cell 30. Similarly, in order to improve the laying efficiency, the third battery cell 30 and the second front adhesive film 40 can be laid at the same time. In addition, before laying the second front adhesive film 40 or after laying the second front adhesive film 40, the laser heating device 5 is controlled to perform laser heating on the second battery cell 30, so that the second front adhesive film 40 is fully released after being heated.

[0072] like Figure 1 As shown in (k) in FIG. 1 , the serial conveying device 1 is configured to step forward a predetermined distance to the rear track, so that the third battery cell 30 and the third back adhesive film 10 step forward from the first laying position A to the second laying position B to vacate the first laying position A. Then, the first laying device 3 lays the fourth back adhesive film 10 to the first laying position A.

[0073] like Figure 1 As shown in (l), the first laying device 3 lays the fourth welding ribbon group 20 toward the first laying position A and the second laying position B, wherein: the rear half of the fourth welding ribbon group 20 is placed on the fourth back side adhesive film 10, and the front half of the fourth welding ribbon group 20 is placed on the third battery cell 30 located at the second laying position B.

[0074] This process is repeated until all the battery cells, solder ribbon groups, back film and front film are laid.

[0075] The embodiment of the present application provides a busbarless battery cell string welding machine, which interweaves the laying of the back adhesive film and the front adhesive film during the laying and stacking process of the battery cells and the welding tape group, so that the corresponding welding tape segment can be bonded to the battery cell after the adhesive film is laid. Since the bonding strength of the adhesive film is greater than the connection force after the welding of the welding tape and the busbarless battery cell, it can avoid the welding tape and the battery cell from being separated during the transportation process after stringing.

[0076] In particular, before or after laying the front adhesive film on the front side of the battery cell, the laser heating device heats the battery cell so that the front adhesive film can fully release its viscosity after being heated, thereby more firmly bonding the front half of the corresponding solder tape group to the upper surface of the corresponding battery cell, preventing the front adhesive film from detaching from the battery cell during transportation.

[0077] Optionally, the laser heating device 5 includes a driving mechanism and a laser, wherein: the laser is connected to the driving end of the driving mechanism. Before or after the i-th front adhesive film is laid on the i-th battery cell, the laser is configured to emit a laser toward the i-th battery cell to form a laser spot on the i-th battery cell. The driving mechanism is configured to drive the laser to move so that the laser spot scans the front of the i-th battery cell.

[0078] The laser is driven by a driving mechanism to scan the front side of the i-th battery cell, so that the laser can uniformly heat the i-th battery cell or the i-th front adhesive film laid on the i-th battery cell, ensuring that the i-th front adhesive film bonds all the solder strips in the corresponding solder strip group to the upper surface of the corresponding battery cell.

[0079] As known to those skilled in the art, the galvanometer component of the laser can also achieve the effect of moving the laser spot, so in this case, the driving mechanism is the galvanometer component.

[0080] Optional, such as Figure 5 As shown, when the laser heating device 5 irradiates the i-th battery cell 30, only one laser spot 100 is generated. Figure 5 The square laser spot 100 in the figure has an area smaller than the front area of ​​the i-th cell 30. The driving mechanism drives the laser to move so that the laser spot 100 moves along a predetermined path (e.g. Figure 5 The serpentine path in the figure) sweeps across the front of the i-th cell 30. The light spot 100 may also be in other shapes such as a circle or an ellipse. Of course, in order to shorten the heating time and improve the heating efficiency, the laser heating device 5 may include multiple lasers, so that the laser heating device 5 can generate multiple light spots on the i-th cell 30. When the driving mechanism drives the multiple lasers to move, the multiple laser light spots synchronously sweep across the front of the i-th cell 10 along the predetermined path.

[0081] like Figure 6As shown, optionally, the laser spot 100 can be a strip-shaped spot. The laser spot 100 is along the width direction of the welding ribbon group ( Figure 6 The driving mechanism is configured to drive the laser to move so that the laser spot 100 is along the length direction of the welding ribbon group ( Figure 6 The front surface of the i-th battery cell 30 is scanned in the direction indicated by the X-axis.

[0082] Of course, the laser spot 100 can also cross the front side of the i-th battery cell 30 along the length direction of the welding ribbon group, and the driving mechanism is configured to drive the laser to move so that the laser spot 100 scans the front side of the i-th battery cell 30 along the width direction of the welding ribbon group.

[0083] Since the strip-shaped laser spot 100 spans across the front surface of the i-th battery cell 30 , the laser spot 100 only needs one scanning stroke to complete a full irradiation and heating of the front surface of the battery cell, thereby shortening the heating time and improving the heating efficiency.

[0084] Optional, such as Figure 7 As shown, the laser spot 100 sweeps across the front surface of the i-th battery cell 30 along the length direction of the solder ribbon group. The laser heating device 5 further includes a shaping mechanism disposed at the emission end of the laser, which is used to shape the laser spot 100 so that a plurality of avoidance gaps are formed on the laser spot 100, each of which is used to avoid a solder ribbon in the solder ribbon group 20. In this way, it is possible to avoid tinning of the solder ribbon when the laser spot 100 heats the battery cell 30 or the front adhesive film 40.

[0085] like Figures 8 to 9 As shown, in order to save costs, in other optional embodiments, the laser heating device 5 only includes a laser, and the laser is configured to emit laser toward the serial conveying device 1 to generate a strip-shaped laser spot 100 on the serial conveying device 1, and the laser spot 100 extends along the width direction of the solder ribbon group, and the length of the laser spot 100 is greater than the length of the battery cell 30 along the width direction of the solder ribbon group. During the stepping process of the serial conveying device 1 to the back path, the i-th battery cell passes under the laser heating device 5, so that the laser spot 100 scans the front of the i-th battery cell along the length direction of the solder ribbon group.

[0086] The stepping direction of the serial conveying device 1 is Figure 8 and Fig. 9 The X-axis direction shown in is the length direction of the welding ribbon group.

[0087] Optional, such as Fig. 9As shown, the laser spot 100 formed by the laser on the serial conveying device 1 is located between the first laying position A and the second laying position B, so that the i-th battery cell 30 is heated by the laser spot 100 during the step-by-step conveyance from the first laying position A to the second laying position B. In this way, the i-th front adhesive film 40 laid on the i-th battery cell is heated by the i-th battery cell 30, thereby fully releasing the viscosity.

[0088] Of course, by adjusting the installation position of the laser heating device 5, the laser spot 100 formed by the laser on the serial conveying device 1 can also be located at the back of the second laying position B. In this way, after the i-th front adhesive film 40 is laid on the i-th battery cell 30, the i-th front adhesive film 40 is directly heated by the laser spot 100 during the stepping process from the second laying position B to the back direction along with the i-th battery cell 30, so that the viscosity is fully released or at least preliminarily released.

[0089] Similarly, the laser heating device also includes a shaping mechanism disposed at the emission end of the laser, which is used to shape the laser spot so that a plurality of avoidance gaps are formed on the laser spot 100, each of which is used to avoid a solder strip in the solder strip group. In this way, it is possible to avoid tinning of the solder strip when the laser spot 100 heats the battery cell 30 or the front adhesive film 40.

[0090] Optionally, the welding tape supply device 2 includes a welding tape supply mechanism, a welding tape clamping mechanism, a welding tape cutting mechanism and a welding tape tail clamp which are arranged in front of the serial conveying device and are arranged in sequence along the conveying direction of the serial conveying device, wherein: the welding tape supply mechanism is used to supply multiple parallel welding tapes. The first laying device 3 is configured to pull multiple welding tapes so that the multiple welding tapes pass through the welding tape clamping mechanism, the welding tape cutting mechanism and the welding tape tail clamp in sequence and then enter the serial conveying device 1. When the welding tape between the welding tape cutting mechanism and the welding tape tail clamp reaches a predetermined length, the welding tape clamping mechanism is configured to clamp the welding tape, and the welding tape cutting mechanism is configured to cut the welding tape, so as to obtain a welding tape group including multiple welding tapes with a predetermined length.

[0091] It can be seen that, through the cooperation of the solder ribbon supply mechanism, the solder ribbon clamping mechanism, the solder ribbon cutting mechanism and the solder ribbon tail clamp, the solder ribbon supply device 2 realizes the automatic supply of the solder ribbon group with a predetermined length.

[0092] like Figure 4As shown, optionally, the first laying device 3 includes a film supply mechanism 31, a first laying mechanism 32 and a second laying mechanism 33, wherein: the film supply mechanism 31 is used to supply the back film and the front film. The first laying mechanism 32 is used to obtain the back film from the film supply mechanism, and lay the obtained back film to the first laying position A. The first laying mechanism 32 is also used to obtain the welding tape group supplied by the welding tape supply device 2, and lay the obtained welding tape group to the first laying position A and the second laying position B. The second laying mechanism 33 is used to obtain the front film from the film supply mechanism 31, and lay the obtained front film on the i-th battery cell. It can be seen that the first laying mechanism 32 and the second laying mechanism 33 respectively obtain the back film and the front film from the film supply mechanism 31, and alternately complete the laying of the back film and the front film, thereby improving the film laying efficiency. In addition, the first laying mechanism 32 also completes the laying of the welding tape group, thereby making the utilization rate of the motion module higher.

[0093] like Figure 2 and Figure 3 As shown, optionally, the second laying device 4 includes a cell conveying mechanism 41, a detection mechanism 42, a cell transport mechanism 43 and an NG sheet material box, wherein: the cell conveying mechanism 41 is used to transport the cell toward the serial conveying device 1, and at least a detection station and a transport station are sequentially arranged on the conveying path of the cell conveying mechanism 41. The detection mechanism 42 is arranged at the detection station, and is used to perform quality inspection on the cell conveyed to the detection station. The cell transport mechanism 43 is used to pick up the qualified cell conveyed to the transport station, and to lay the picked qualified cell to the first laying position A. The NG sheet material box is located at the discharge end of the cell conveying mechanism 41, and is used to recover the NG cell that fails the inspection.

[0094] The second laying device 4 is configured in this way so that the second laying device 4 can realize quality inspection of the battery cells before laying the battery cells, ensuring that the second laying device 4 only lays qualified battery cells to the first laying position A, and NG cells are recovered by the NG cell material box.

[0095] The present application is described in sufficient detail above with certain particularity. It should be understood by those skilled in the art that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present application should fall within the scope of protection of the present application. The scope of protection claimed in the present application is defined by the claims, rather than by the above description in the embodiments.

Claims

1. A busbar-free solar cell series connection device, characterized in that: Used to connect battery cells in series into battery strings, wherein the battery cells are busbar-free battery cells, and the busbar-free battery cell series connection equipment includes a series connection conveying device, a welding ribbon supply device, a first laying device, a second laying device and a laser heating device, wherein: The serial conveying device is provided with a first laying position and a second laying position, and the serial conveying device sequentially conveys through the first laying position and the second laying position; The welding ribbon supply device is used to supply the welding ribbon group; The first laying device is configured to lay the (i+1)th back adhesive film on the vacated first laying position; The first laying device is further configured to lay the i+1th welding ribbon group to the first laying position and the second laying position, wherein the second half of the i+1th welding ribbon group is placed on the i+1th back adhesive film, and the first half of the i+1th welding ribbon group is placed on the i-th battery cell located at the second laying position; The second laying device is configured to lay the i+1th battery cell to the first laying position, and the i+1th back side adhesive film adheres the second half of the i+1th welding ribbon group to the back side of the i+1th battery cell; the first laying device is also configured to lay the i-th front side adhesive film on the i-th battery cell; The laser heating device is arranged above the serial conveying device, and the laser heating device is configured to perform laser heating on the i-th battery cell before or after laying the i-th front adhesive film, so that the first half of the i+1-th welding ribbon group is bonded to the front side of the i-th battery cell after the i-th front adhesive film releases its viscosity; The serial conveying device is configured to step forward a predetermined distance toward the back track, so that the i+1th battery cell and the i+1th back adhesive film step from the first laying position to the second laying position to vacate the first laying position; Here, i is an integer ≥1.

2. The busbar-free solar cell series connection device according to claim 1, characterized in that: The laser heating device comprises a driving mechanism and a laser, wherein: The laser is connected to the driving end of the driving mechanism, and the laser is configured to emit laser light toward the i-th battery cell to form a laser spot on the i-th battery cell; The driving mechanism is configured to drive the laser to move so that the laser spot scans the front side of the i-th battery cell.

3. The busbar-free solar cell series connection device according to claim 2, characterized in that: The laser spot includes at least one circular spot or at least one square spot, the area of ​​the laser spot is smaller than the front area of ​​the i-th battery cell, and the driving mechanism is configured to drive the laser to move so that the laser spot scans the front of the i-th battery cell along a predetermined path.

4. The busbar-free solar cell series connection device according to claim 2, characterized in that: The laser spot is a stripe spot; The laser spot crosses the front side of the i-th battery cell along the width direction of the welding ribbon group, and the driving mechanism is configured to drive the laser to move so that the laser spot sweeps across the front side of the i-th battery cell along the length direction of the welding ribbon group; or, The laser spot spans across the front side of the i-th battery cell along the length direction of the welding ribbon group, and the driving mechanism is configured to drive the laser to move so that the laser spot scans across the front side of the i-th battery cell along the width direction of the welding ribbon group.

5. The busbar-free solar cell series connection device according to claim 4, characterized in that: The laser spot is scanned across the front side of the i-th battery cell along the length direction of the welding ribbon group; The laser heating device also includes a shaping mechanism arranged at the emitting end of the laser, and the shaping mechanism is used to shape the laser spot so that a plurality of avoidance gaps are formed on the laser spot, and each of the avoidance gaps is used to avoid a soldering strip in the soldering strip group.

6. The busbar-free solar cell series connection device according to claim 1, characterized in that: The laser heating device comprises a laser, and the laser is configured to emit laser light toward the serial conveying device to generate a strip-shaped laser spot, and the laser spot extends along the width direction of the solder ribbon group, and the length of the laser spot is greater than the length of the battery cell along the width direction of the solder ribbon group; When the serial conveying device steps toward the back track, the laser spot scans the front side of the i-th battery cell along the length direction of the solder ribbon group.

7. The busbar-free solar cell series connection device according to claim 6, characterized in that: The laser heating device also includes a shaping mechanism arranged at the emitting end of the laser, and the shaping mechanism is used to shape the laser spot so that a plurality of avoidance gaps are formed on the laser spot, and each of the avoidance gaps is used to avoid a soldering strip in the soldering strip group.

8. The busbar-free solar cell series connection device according to claim 1, characterized in that: The solder strip supply device comprises a solder strip supply mechanism, a solder strip clamping mechanism, a solder strip cutting mechanism and a solder strip tail clamp which are arranged in front of the serial conveying device and are arranged in sequence along the conveying direction of the serial conveying device, wherein: The welding ribbon supply mechanism is used to supply a plurality of parallel welding ribbons; The first laying device is configured to pull the plurality of welding ribbons so that the plurality of welding ribbons sequentially pass through the welding ribbon clamping mechanism, the welding ribbon cutting mechanism and the welding ribbon tail clamp and then enter the serial conveying device; When the welding ribbon between the welding ribbon cutting mechanism and the first laying device reaches a predetermined length, the welding ribbon clamping mechanism is configured to clamp the welding ribbon, and the welding ribbon cutting mechanism is configured to cut the welding ribbon to obtain a welding ribbon group including multiple welding ribbons with predetermined lengths.

9. The busbar-free solar cell series connection device according to claim 1, characterized in that: The first laying device comprises a film supply mechanism, a first laying mechanism and a second laying mechanism, wherein: The adhesive film supply mechanism is used to supply the back adhesive film and the front adhesive film; The first laying mechanism is used to obtain the back adhesive film from the adhesive film supply mechanism, and lay the obtained back adhesive film to the first laying position; the first laying mechanism is also used to obtain the welding tape group supplied by the welding tape supply device, and lay the obtained welding tape group to the first laying position and the second laying position; The second laying mechanism is used to obtain the front adhesive film from the adhesive film supply mechanism and lay the obtained front adhesive film on the i-th battery cell.

10. The busbar-free solar cell series connection device according to claim 1, characterized in that: The second laying device includes a cell conveying mechanism, a detection mechanism, a cell handling mechanism and an NG cell material box, wherein: The battery cell conveying mechanism is used to convey the battery cells toward the serial conveying device, and at least a detection station and a handling station are sequentially arranged on the conveying path of the battery cell conveying mechanism; The inspection mechanism is arranged at the inspection station and is used to perform quality inspection on the battery cells transported to the inspection station; The battery cell transport mechanism is used to pick up the qualified battery cells transported to the transport station, and lay the picked up qualified battery cells to the first laying position; The NG cell material box is located at the discharging end of the cell conveying mechanism and is used to recover NG cell cells that fail the inspection.

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