Solar cell string welding equipment and solar cell string welding method

Abstract

The present invention discloses a cell string welding device and a cell string welding method. The cell string welding device includes: a welding conveying device for conveying cells and solder tapes; a solder tape handling device configured to handle the head and tail of a set of solder tapes and convey the set of solder tapes to the cells to be welded on the welding conveying device; a solder tape pressing device configured to press at least two positions in the length direction of the solder tapes to be welded placed on the solder tape conveying device; and a welding device located at a welding station for welding the solder tapes located at the welding station on the welding conveying device to the cells. The technical solution provided by the present invention can weld back contact cells and solder tapes to form a cell string, and during welding, the positioning of the solder tapes is accurate, which is beneficial to improving the welding quality of the cell string and has high welding efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of photovoltaic cell production, and particularly relates to a cell string welding device and a cell string welding method. Background Art

[0002] The string welding machine is one of the important devices in the production process of solar panels, and is used to weld multiple cells into a cell string through welding tapes.

[0003] Currently, in order to avoid the front side of the cell being blocked, back-contact cells are designed, that is, the cell adopts a structural form in which the grid lines are all arranged on the back side of the cell. The specific steps of welding the back-contact cells into a string are that the grid lines on the back sides of adjacent first and second cells are connected in series through a first group of welding tapes, and the grid lines on the back sides of adjacent second and third cells are connected in series through a second group of welding tapes.

[0004] In order to weld the back-contact cells into a string, a cell string welding device is needed to realize the automation of back-contact cell welding. Summary of the Invention

[0005] In view of this, the present invention aims to provide a cell string welding device and a cell string welding method to realize the series welding connection of back-contact cells.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] The present invention provides a cell string welding device, and the cell string welding device includes:

[0008] A welding and conveying device, which is used to convey cells and welding tapes;

[0009] A welding tape handling device, which is arranged to be able to handle the head and tail of a group of welding tapes and convey the group of welding tapes to the cells to be welded on the welding and conveying device;

[0010] A welding tape pressing device, which is arranged to press at least two positions in the length direction of the welding tapes placed on the welding and conveying device to be welded;

[0011] A welding device, which is located at the welding station and welds the welding tapes on the welding and conveying device at the welding station to the cells.

[0012] Preferably, the welding tape handling device includes a first handling device and a second handling device which are relatively spaced apart, and the first handling device and the second handling device respectively clamp the two ends of the same group of welding tapes and convey the clamped welding tapes to the welding and conveying device.

[0013] Preferably, each of the first handling device and the second handling device includes a solder tape clamping mechanism for clamping a solder tape, a front-back driving mechanism for driving the solder tape clamping mechanism to move back and forth along the conveying direction of the welding conveying device, a lifting driving mechanism for driving the solder tape clamping mechanism to lift, and a lateral movement driving mechanism for driving the solder tape clamping mechanism to move in a lateral direction perpendicular to the conveying direction of the welding conveying device.

[0014] Preferably, the solder tape pressing device includes a solder tape head positioning device for pressing a group of solder tapes at the head of the battery string to be welded.

[0015] Preferably, the solder tape head positioning device includes a pressure bar mechanism and a pressure bar moving mechanism for driving the pressure bar mechanism to move along the conveying direction of the welding conveying device; wherein, the pressure bar mechanism includes a pressure bar for pressing the solder tape and a pressure bar lifting mechanism for driving the pressure bar to lift.

[0016] Preferably, the solder tape pressing device further includes a pressing tooling and a tooling handling device configured to move the pressing tooling to the solder tape to be welded carried by the welding conveying device.

[0017] Preferably, the tooling handling device includes a tooling clamping mechanism capable of clamping the pressing tooling and a tooling handling lifting mechanism for driving the tooling clamping mechanism to lift;

[0018] The battery string soldering equipment further includes a lateral movement mechanism for driving the tooling handling device to move in a direction perpendicular to the conveying direction of the welding conveying device and a longitudinal movement mechanism for driving the tooling handling device to move back and forth along the conveying direction of the welding conveying device.

[0019] Preferably, a groove for limiting the solder tape is provided at the bottom of the pressing tooling;

[0020] The pressing tooling is made of a magnetic adsorption material, and a magnet for adsorbing and positioning the pressing tooling is provided on the welding conveying device.

[0021] Preferably, the battery string soldering equipment further includes a tooling carrying device for carrying the pressing tooling, and the tooling handling device is configured to be able to move to the tooling carrying device and carry the pressing tooling from the tooling carrying device.

[0022] Preferably, the solder tape pressing device includes a first solder tape pressing device and a second solder tape pressing device capable of lifting provided on the welding device, and the first solder tape pressing device and the second solder tape pressing device are spaced apart below the welding device to respectively press two positions in the length direction of the solder tape to be welded.

[0023] According to another aspect of the present invention, there is also provided a method for string welding of solar cells, and the method for string welding of solar cells includes:

[0024] Laying the i-th solar cell on a welding conveying device, and laying the i-th group of welding tapes on the i-th solar cell. The second half of the i-th group of welding tapes covers the grid lines on the upper surface of the i-th solar cell, and the first half of the i-th group of welding tapes covers the grid lines on the upper surface of the (i - 1)-th solar cell, where i > 1;

[0025] Pressing and positioning the second half of the i-th group of welding tapes;

[0026] Controlling the welding conveying device to step forward by i + 1, and continuing to execute the step of laying the i-th solar cell on the welding conveying device.

[0027] Preferably, after laying the i-th solar cell on the welding conveying device, when i = 1, the first half of the i-th group of welding tapes is placed on the welding conveying device, and the second half covers the grid lines on the upper surface of the i-th solar cell; the first half of the i-th group of welding tapes is pressed and positioned by a welding tape head positioning device.

[0028] The technical solution provided by the present invention can weld the back-contact solar cells and the welding tapes to form a battery string, and during welding, the positioning of the welding tapes is accurate, which is beneficial to improving the welding quality of the battery string and has high welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0030] In the drawings:

[0031] Figure 1 is a schematic diagram of a back-contact solar cell;

[0032] Figure 2 is a schematic diagram of a battery string formed by welding a welding tape and a back-contact solar cell;

[0033] Figure 3 is a schematic structural diagram of a solar cell string welding device according to an embodiment of the present invention;

[0034] Figure 4 is a schematic structural diagram of a first handling device in the solar cell string welding device;

[0035] Figure 5 is Figure 4 a schematic side view structural diagram of the first handling device shown;

[0036] Figure 6Schematic structural diagram of a tooling handling device in a battery cell string welding device;

[0037] Figure 7 is Figure 6 Schematic structural diagram of the moving gripper and the fixed gripper in the shown tooling handling device in a separated state;

[0038] Figure 8 Schematic structural diagram of the cooperation between the tooling handling device and the tooling carrying device;

[0039] Figure 9 Schematic structural diagram of a solder tape head positioning device in a battery cell string welding device;

[0040] Figure 10 Partial enlarged structural diagram of the solder tape head positioning device.

[0041] Explanation of reference numerals:

[0042] 11 - First group of solder tapes; 111 - Extended section; 12 - Second group of solder tapes; 13 - Third group of solder tapes; 21 - First battery cell; 22 - Second battery cell; 23 - Third battery cell; 100 - Welding conveying device; 200 - Welding device; 300 - First handling device; 301 - Frame; 302 - Cross - movement driving mechanism; 303 - Lifting driving mechanism; 304 - Front - rear driving mechanism; 305 - Solder tape gripping mechanism; 3051 - Pressing part; 3052 - Upper pressing part; 3053 - Gripping driving mechanism; 400 - Second handling device; 500 - Tooling carrying device; 501 - Carrying plate; 600 - Tooling handling device; 601 - Mounting frame; 602 - Fixed gripper; 6021 - Fixed clamping part; 6022 - Fixed beam; 6023 - Chute; 6024 - Installation space; 6025 - Installation groove; 603 - Moving gripper; 6031 - Moving clamping part; 6032 - Moving beam; 6033 - Round hole; 604 - Swing rod; 605 - First rotating shaft; 606 - Driving shaft; 607 Second rotating shaft; 608 - Roller; 609 - Connecting block; 610 - Baffle; 611 - Driving cylinder; 612 - Tooling handling lifting mechanism; 700 - Solder tape head positioning device; 701 - Fixed frame; 702 - Pressing rod mechanism; 7021 - Mounting bracket; 7022 - Pressing rod; 7023 - Pressing rod lifting mechanism; 703 - Pressing rod moving mechanism; 7031 - Motor; 7032 - Lead screw; 7033 - Nut; 704 - Moving seat; 705 - First slide rail; 706 - Fixed block; 7061 - First limiting part; 7062 - Second limiting part; 7063 - Spring post; 7064 - Helical spring; 707 - Connecting frame; 800 - Longitudinal movement mechanism; 900 - Pressing tooling. Detailed implementation manners

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted.

[0044] In addition, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that one or more of the specific details may be omitted, or other methods, components, devices, steps, etc. may be employed. In other cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the present disclosure.

[0045] For ease of explanation, spatially relative terms such as "upper", "lower", "left", "right", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to another element or feature. It should be understood that, in addition to the orientation shown in the drawings, the spatially relative terms are intended to include different orientations of the device during use or operation. For example, if the device in the drawings is inverted, an element described as being "lower" than other elements or features will be positioned "above" the other elements or features. Thus, the exemplary term "lower" can encompass both upper and lower orientations. The device may also be positioned in other ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein may be interpreted accordingly.

[0046] The present invention provides a cell string welding device, as Figure 3 shown, the cell string welding device includes:

[0047] A welding and conveying device 100 for conveying cells and solder tapes;

[0048] A solder tape handling device configured to be able to handle the head and tail of a group of solder tapes and transport the group of solder tapes to the cells to be welded on the welding and conveying device 100; as Figure 3 shown, the solder tape handling device includes a first handling device 300 and a second handling device 400; wherein, the second handling device 400 is used to handle the head position of the solder tape, and the first handling device 300 is used to handle the tail position of the solder tape (the tail position is upstream of the welding and conveying device 100 compared to the head position).

[0049] The solder tape pressing device is configured to press at least two positions in the length direction of the solder tape to be welded placed on the welding conveying device 100.

[0050] The welding device 200 is located at the welding station and welds the solder tape on the welding conveying device 100 at the welding station to the battery cell.

[0051] The battery cell string welding equipment provided by the present invention can be used to weld a back-contact battery cell ( Figure 1 the battery cell shown with a positive electrode line A and a negative electrode line B on the back) and the solder tape to form a battery string, that is, the second half of the i-th group of solder tapes covers the grid lines on the upper surface of the i-th battery cell, and the first half of the i-th group of solder tapes covers the grid lines on the upper surface of the (i - 1)-th battery cell (when i is greater than 1). When i = 1, the first half of the i-th group of solder tapes is placed on the welding conveying device 100, and the second half covers the grid lines on the upper surface of the i-th battery cell.

[0052] During specific operation, referring to Figure 2 , place the back of the battery cell facing up on the welding conveying device 100, transport the first group of solder tapes 11 through the solder tape handling device, stack and weld the second half of the first group of solder tapes 11 on the positive electrode line A of the first battery cell 21, and lay the first half on the welding conveying device 100 (this first half is Figure 2 the extended section 111 shown in), then transport the second group of solder tapes 12, stack and weld the first half of the second group of solder tapes 12 with multiple negative electrode lines B of the first battery cell 21, and stack and weld the second half with multiple positive electrode lines A of the second battery cell 22. Continue to place the battery cells and solder tapes, stack and weld the first half of the third group of solder tapes 13 with multiple negative electrode lines B of the second battery cell 22, and stack and weld the second half with multiple positive electrode lines A of the third battery cell 23. Repeat the stacking and welding in this way, and multiple battery cells are welded into a string through the solder tape. Among them, after each group of solder tapes is stacked on the battery cell, the solder tape pressing device presses at least two positions in the length direction of each group of solder tapes on the welding conveying device 100 respectively, which can accurately position the solder tape, is beneficial to improving the welding quality of the battery string, and has high welding efficiency.

[0053] Next, according to Figure 1 the embodiments shown, the battery cell string welding equipment provided by the present invention will be described in detail.

[0054] In this embodiment, as Figure 1 shown, the solder tape handling device includes a first handling device 300 and a second handling device 400. The first handling device 300 and the second handling device 400 respectively clamp the head and tail ends of the solder tape and transport the solder tape to the welding conveying device 100.

[0055] The first handling device 300 and the second handling device 400 each include a solder tape clamping mechanism for clamping a solder tape, a front-back driving mechanism for driving the solder tape clamping mechanism to move back and forth along the conveying direction of the welding conveying device 100, a lifting driving mechanism for driving the solder tape clamping mechanism to lift, and a lateral movement driving mechanism for driving the solder tape clamping mechanism to move in a lateral direction perpendicular to the conveying direction of the welding conveying device.

[0056] In this embodiment, the structure of the first handling device 300 is substantially the same as that of the second handling device 400. Here, only the structure of the first handling device 300 will be described with reference to the drawings.

[0057] The structure of the first handling device 300 is as Figure 4 and Figure 5 shown. The first handling device 300 includes a frame 301, a solder tape clamping mechanism 305, a front-back driving mechanism 304 for driving the solder tape clamping mechanism 305 to move back and forth along the conveying direction of the welding conveying device 100, a lifting driving mechanism 303 for driving the solder tape clamping mechanism 305 to lift, and a lateral movement driving mechanism 302 for driving the solder tape clamping mechanism 305 to move in a lateral direction perpendicular to the conveying direction of the solder tape along the frame 301. Among them, the lateral movement driving mechanism 302, the lifting driving mechanism 303, and the front-back driving mechanism 304 can adopt air cylinders or linear driving mechanisms such as ball screws to drive the movement of the solder tape clamping mechanism. The specific implementation method can be achieved by those skilled in the art and will not be specifically described here.

[0058] Among them, the solder tape clamping mechanism 305 in this embodiment includes a lower pressing part 3051, an upper pressing part 3052, and a clamping driving mechanism 3053. The clamping driving mechanism 3053 can drive the upper pressing part 3052 to move towards or away from the lower pressing part 3051. The clamping driving mechanism 3053 preferably adopts an air cylinder. An elastic member is provided on the upper pressing part 3052 to play a buffering role when contacting the lower pressing part 3051.

[0059] During handling, the solder tape clamping mechanisms 305 of the first handling device 300 and the second handling device 400 are both located on one side of the welding conveying device 100. They respectively lift through the lifting driving mechanism 303 to clamp both ends of the solder tape. Then, the two handling devices respectively drive the solder tape clamping mechanism 305 to move laterally through the lateral movement driving mechanism 302, and together laterally move the clamped solder tape onto the welding conveying device 100. Then, the solder tape clamping mechanism 305 is driven to move back and forth through the front-back driving mechanism 304 to place the solder tape at a suitable position on the welding conveying device 100.

[0060] Since the first group of solder tapes at the head of each string of battery strings has an extended section 111 extending out of the battery cells and laid on the welding conveying device 100 (such asFigure 2 As shown in the figure, when welding a battery string, when a part of the first group of welding tapes 11 to be welded is stacked on the first pole line of the battery cell (such as the positive pole line A of the battery cell, or it can also be the negative pole line B), and the other part (the protruding section 111) extends to the outside of the first battery cell 21, it is necessary to position the protruding section 111. In this embodiment, the welding tape pressing device includes a welding tape head positioning device 700, and the welding tape head positioning device 700 is used to press the protruding section 111 of the first group of welding tapes 11 of the battery string to be welded.

[0061] The specific structure of the welding tape head positioning device 700 is as Figure 9 and Figure 10 shown, and it includes a pressure bar mechanism 702 and a pressure bar moving mechanism 703 that drives the pressure bar mechanism 702 to move along the conveying direction of the welding conveying device 100. Among them, the pressure bar mechanism 702 includes a pressure bar 7022 for pressing the welding tape and a pressure bar lifting mechanism 7023 for driving the pressure bar 7022 to lift and lower.

[0062] Specifically, the welding tape head positioning device 700 further includes a fixed frame 701 and a moving seat 704 that can move relative to the fixed seat 701. The pressure bar mechanism 702 is installed on the moving seat 704, and the pressure bar moving mechanism 703 drives the moving seat 704 to move relative to the fixed frame 701 along the conveying direction of the welding conveying device 100;

[0063] Among them, the pressure bar mechanism 702 specifically includes:

[0064] An installation bracket 7021, the installation bracket 7021 is installed on the moving seat 704 and can lift and lower relative to the moving seat 704;

[0065] A pressure bar lifting mechanism 7023, the pressure bar lifting mechanism 7023 drives the installation bracket 7021 to lift and lower;

[0066] A pressure bar 7022 for pressing the welding tape, the pressure bar 7022 is fixed on the installation bracket 7021.

[0067] In this way, when the pressure bar lifting mechanism 7023 drives the installation bracket 7021 to lift and lower, the pressure bar 7022 installed on the installation bracket 7021 lifts and lowers, pressing on or lifting from the welding tape conveyed by the welding conveying device 100. Through this welding tape positioning device, the positioning of the welding tape on the welding conveying device 100 is simple and convenient.

[0068] Further, the lever moving mechanism 703 that drives the movement of the moving seat 704 includes a motor 7031, a lead screw 7032 driven by the motor 7031, and a nut 7033 that cooperates with the lead screw 7032. The moving seat 704 is fixed to the nut 7033. When the motor 7031 drives the lead screw 7032 to rotate, the nut 7033 moves along the axial direction of the lead screw 7032, thereby driving the movement of the moving seat 704. Of course, in addition to the above structural form, the moving driving mechanism 703 can also use other driving mechanisms such as air cylinders to drive the movement of the moving seat 704.

[0069] To enable the moving seat 704 to move relative to the fixed frame 701 stably along a preset trajectory, a first slide rail 705 is provided between the fixed frame 701 and the moving seat 704, and the moving seat 704 moves along the first slide rail 705.

[0070] A second slide rail is provided between the mounting bracket 7021 on which the pressing lever 7022 is mounted and the moving seat 704, and the mounting bracket 7021 is mounted to be able to move up and down along the second slide rail.

[0071] In this embodiment, as Figure 1 and Figure 2 shown, the pressing lever lifting mechanism 7023 of the pressing lever mechanism 702 is an air cylinder. The fixed end of the air cylinder is fixed to the moving seat 704, and the driving end of the air cylinder is connected to the mounting bracket 7021 through a connecting frame 707. The mounting bracket 7021 is driven to move up and down by the expansion and contraction of the driving end of the air cylinder.

[0072] To limit the lifting range of the mounting bracket 7021, and thus limit the lifting range of the pressing lever 7022, the pressing lever mechanism 702 further includes a first limiting portion 7061 fixed relative to the moving seat 704 and a second limiting portion 7062 located above the first limiting portion 7061. The mounting bracket 7021 is arranged to move up and down within the range defined by the first limiting portion 7061 and the second limiting portion 7062.

[0073] Specifically, as Figure 10 shown, a U-shaped block 706 is fixed on the moving seat 704 on one side of the mounting bracket 7021 and the opening faces the mounting bracket 7021. The mounting bracket 7021 includes an extension portion extending into the opening of the U-shaped block 706 ( Figure 10The part at the C position in the middle), the first limiting part 7061 is located on one side of the bottom of the U-shaped block, and the second limiting part 7062 is located on one side of the top of the U-shaped block 706. The first limiting part 7061 and the second limiting part 7062 limit the lifting of the extension part. Among them, the first limiting part 7061 is a column body penetrating through one side of the bottom of the U-shaped block 706, and the second limiting part 7062 is a column body penetrating through one side of the top of the U-shaped block 706. Of course, the first limiting part 7061 and the second limiting part 7062 can also adopt other structures fixed on the moving seat 704.

[0074] In addition, to avoid the impact sound caused by the descent of the mounting bracket 7021, the pressing rod mechanism 702 further includes an elastic member that buffers the descent of the mounting bracket 7021. Specifically, a spring column 7063 is fixed on one side of the bottom of the U-shaped block 706, and the mounting bracket 7021 is movably penetrated through the spring column 7063. The elastic member that buffers the mounting bracket 7021 is a spiral spring 7064 sleeved on the spring column 7063 and located between the mounting bracket 7021 and the U-shaped block 706. When the mounting bracket 7021 moves up and down, it moves along the spring column 7063, compressing or releasing the spiral spring 7064, thereby playing a buffering role.

[0075] In addition, the pressing rod 7022 is a long strip structure suitable for pressing on multiple side-by-side welding tapes. To make the pressing rod 7022 have a buffering effect when pressing on the welding tape, preferably, a plurality of pressing columns are arranged at intervals along the length direction of the pressing rod 22, and there is an elastic member between the pressing column and the main structure of the pressing rod, so that the pressing rod 7022 has a buffering effect when pressing on the welding tape.

[0076] In the cell string welding device provided in this embodiment, the welding tape pressing device further includes a pressing tooling and a tooling handling device 600 for transporting the pressing tooling to the tail of the welding tape.

[0077] The structure of the tooling handling device 600 is as Figure 6 and Figure 7 shown, and it includes a tooling clamping mechanism for clamping the pressing tooling and a tooling handling lifting mechanism 612 for driving the tooling clamping mechanism to lift.

[0078] The cell string welding device further includes a lateral moving mechanism (not shown in the figure) for driving the tooling handling device 600 to move in a direction perpendicular to the conveying direction of the welding conveying device 100 and a longitudinal moving mechanism 800 for driving the tooling handling device 600 to move back and forth along the conveying direction of the welding conveying device 100 (refer to Figure 8 ).

[0079] Among them, the tooling clamping mechanism includes:

[0080] Mounting bracket 601;

[0081] Fixed clamping jaws 602, the fixed clamping jaws 602 are fixed relative to the mounting bracket 601, and a plurality of fixed clamping portions 6021 are arranged at intervals on the fixed clamping jaws 602;

[0082] Moving clamping jaws 603, a plurality of moving clamping portions 6031 are arranged at intervals on the moving clamping jaws 603, and the plurality of moving clamping portions 6031 and the plurality of fixed clamping portions 6021 respectively correspond to each other one by one, and are paired to be capable of clamping the tooling, Figure 7 The state in which a plurality of pressing toolings 900 are respectively located between a plurality of fixed clamping portions 6021 and corresponding moving clamping portions 6031 is shown;

[0083] Driving mechanism, the driving mechanism drives the moving clamping jaws 603 to move relative to the fixed clamping jaws 602, so that the plurality of moving clamping portions 6031 and the plurality of fixed clamping portions 6021 respectively correspond to and clamp.

[0084] The tooling handling device 600 can handle a plurality of pressing toolings 900 at one time, and place the plurality of pressing toolings 900 on a plurality of solder tapes to be welded in the battery string soldering equipment for pressing and positioning respectively.

[0085] In this embodiment, the fixed clamping jaws 602 include a fixed beam 6022 and a plurality of the fixed clamping portions 6021 arranged on one side of the fixed beam 6022, and a chute 6023 is arranged on the fixed beam 6022 along the length direction;

[0086] The moving clamping jaws 603 include a moving beam 6032, the moving beam 6032 is installed in the chute 6023 of the fixed clamping jaws 602 and can move in the chute 6023. The cooperation structure of the moving clamping jaws 603 and the fixed clamping jaws 602 is as Figure 6 and Figure 7 shown.

[0087] To prevent the moving clamping jaws 603 from slipping out of the chute 6023 of the fixed clamping jaws 602, the tooling handling device 600 further includes a baffle 610, and the baffle 610 is fixed at the top of the chute 6023 to prevent the moving beam 6032 of the moving clamping jaws 603 from slipping out of the chute 6023 from above. Preferably, at least two baffles 610 are arranged at intervals along the length direction of the chute 6023.

[0088] To drive the movable jaw 603 to move relative to the fixed jaw 602, a driving mechanism is provided. The driving mechanism includes a swing rod 604 rotatably mounted on the mounting bracket 601 and a swing rod driving component for driving the swing rod 604 to swing. The first end of the swing rod 604 is connected to the movable jaw 603 to drive the movable jaw 603 to move through the swing of the first end.

[0089] Specifically, as Figure 1 and Figure 2 shown, the swing rod 604 is rotatably mounted on the mounting bracket 601 through a first rotating shaft 605. The first end of the swing rod 604 and the movable jaw 603 are connected through a driving shaft 606. A waist-shaped hole through which the driving shaft 606 passes is provided in one of the first end of the swing rod 604 and the movable jaw 603, and a circular hole through which the driving shaft 606 passes is provided in the other.

[0090] In this embodiment, specifically, a circular hole 6033 is provided at the end of the movable jaw 603, and a waist-shaped hole is provided at the first end of the swing rod 604. Further, one end of the fixed beam 6022 of the fixed jaw 602 is fixed on the mounting bracket 601, and an installation groove 6025 communicating with the chute 6022 is provided at this end. The end of the movable jaw 603 having the circular hole 6033 is located in the installation groove 6025, and an installation space 6024 communicating with the installation groove 6025 is further formed at this end of the fixed jaw 602. The first end of the swing rod 604 extends into the installation space 6024 of the fixed jaw 602. The driving shaft 606 passes through the movable jaw 603 and the swing rod 604 in the installation groove 6025, and the driving shaft 606 is restricted in the circular hole 6033 of the movable jaw 603 by a fastener and cannot escape. The lower part of the driving shaft 606 is inserted into the waist-shaped hole of the swing rod 604. When the swing rod 604 swings, the swing rod 604 pushes the driving shaft 606 to move, and the movement of the driving shaft 606 can push the movable jaw 603 to move along the chute 6023.

[0091] The swing rod driving component for driving the swing rod 604 to swing includes a connecting block 609 and a force applying component for applying a force to the connecting block 609. The second end of the swing rod 604 away from the first end is hinged to the connecting block 609, so that when the force applying component applies a force to the connecting block 609 to push and pull the connecting block 609, the connecting block 609 drives the swing rod 604 to swing.

[0092] As Figure 6As shown, the second end of the swing rod 604 is hinged to the connecting block 609 through the second rotating shaft 607. To make the rotation of the swing rod 604 relative to the connecting block 609 flexible, a roller 608 is arranged between the second rotating shaft 607 and the swing rod 604. When the connecting block 609 is pushed by the force-applying component, the connecting block 609 pushes the second rotating shaft 607 and the roller 608 to move. The second end of the swing rod 604 swings and rotates around the second rotating shaft 607 under the push of the roller 608, so that the first end of the swing rod 604 can drive the moving jaw 603 to move.

[0093] Preferably, the force-applying component for applying force to the connecting block 609 is a driving cylinder 611 whose driving end is connected to the connecting block 609. Of course, this force-applying component can also be other suitable components or mechanisms that can push the connecting block 609 to move.

[0094] In this embodiment, the tooling handling lifting mechanism 612 for driving the tooling clamping mechanism to lift is a lifting cylinder connected to the mounting frame 601. The lifting cylinder drives the mounting frame 601 to lift, so as to drive the fixed jaw 602 and the moving jaw 603 to lift to a suitable position to clamp the tooling.

[0095] In this embodiment, the driving end of the lateral moving mechanism for driving the tooling handling device 600 to move laterally is connected to the fixed end of the tooling handling lifting mechanism 612. In this way, the lateral moving mechanism can drive the entire tooling handling lifting mechanism 612 and the tooling clamping mechanism to move laterally; the fixed end of the lateral moving mechanism is connected to the driving end of the longitudinal moving mechanism 800, and the fixed end of the longitudinal moving mechanism 800 is fixed on the frame. In this way, the longitudinal moving mechanism 800 can drive the lateral moving mechanism, the tooling handling lifting mechanism 612 and the tooling clamping mechanism to move back and forth together along the conveying direction of the welding conveying device 100.

[0096] During operation, first, the longitudinal moving mechanism 800 transports the tooling handling device 600 to the position where the pressing tooling is located, and the tooling handling lifting mechanism 612 lifts the tooling clamping mechanism. Then, the fixed jaw 602 and the moving jaw 603 clamp the pressing tooling. During the clamping process, the lateral moving mechanism can drive the tooling clamping mechanism to move laterally. The fixed clamping part 6021 of the fixed jaw 602 can push the pressing tooling, so that each fixed clamping part 6021 of the fixed jaw 602 is close to each pressing tooling respectively. Then, the moving jaw 603 is driven to approach the pressing tooling and cooperate with the fixed jaw 602 to clamp the pressing tooling.

[0097] In addition, since two adjacent sets of solder tapes are stacked on the solar cell in a staggered manner, when the handling tooling presses one set of solder tapes and then another handling tooling is used to press the other set of solder tapes, the handling tooling clamping mechanism needs to be laterally pushed by a lateral movement mechanism so that the pressing tooling clamped by the handling tooling clamping mechanism is laterally displaced by a preset distance, so that the clamped pressing tooling can be placed on the next set of solder tapes arranged in a staggered manner relative to the previous set of solder tapes. In one embodiment, the lateral movement mechanism can be an electric cylinder.

[0098] The solar cell string soldering equipment provided by the present invention further includes a tooling carrying device 500 for carrying the pressing tooling 900, and the tooling handling device 600 is arranged to be able to move to the tooling carrying device 500 and carry the pressing tooling 900 from the tooling carrying device 600.

[0099] Specifically, Figure 8 Fig. shows the structural state of the cooperation between the tooling handling device 600 and the tooling carrying device 500 provided by the present invention. The tooling carrying device 500 carries a plurality of pressing toolings 900 through a carrying plate 501. The longitudinal movement mechanism 800 can drive the tooling handling device 600 to move to the tooling carrying device 500, so that the moving jaw 603 moves relative to the fixed jaw 602, and the pressing tooling 900 can be clamped from the carrying plate 501 of the tooling carrying device 500. Then, the tooling clamping mechanism is moved to the laying position of the solder tape on the welding conveying device 100 through the longitudinal movement mechanism 800, and the pressing tooling 900 is placed on the solder tape to press and position the solder tape.

[0100] To better position the solder tape by the pressing tooling 900, a groove for limiting the solder tape is provided at the bottom of the pressing tooling 900;

[0101] Preferably, the pressing tooling 900 is made of a magnetic material, and a magnet for adsorbing and positioning the pressing tooling 900 is provided on the welding conveying device 100. The welding conveying device 100 adsorbs the pressing tooling 900 through the magnet, and the pressing tooling 900 can firmly press the solder tape on the welding conveying device 100.

[0102] In this embodiment, the solder tape pressing device further includes a first solder tape pressing device and a second solder tape pressing device that can be lifted and are arranged on the welding device 200. The first solder tape pressing device and the second solder tape pressing device are arranged at intervals below the welding device 200 to respectively press two positions in the length direction of the solder tape to be welded.

[0103] After the solder tape is laid on the solar cell and the solder tape to be welded is located below the welding device 200, the first welding pressing device and the second welding pressing device can be lowered to press on the solder tape to be welded, so that the welding part of the solder tape is tightly attached to the solar cell, which is convenient for welding and has good welding quality.

[0104] In addition, the welding device 200 can be a light box capable of emitting light for heating welding, or a press head with a relatively high temperature can be used for welding, which is not limited herein.

[0105] Those skilled in the art can understand that the structures of the solder ribbon head positioning device, the solder ribbon handling device, the tooling handling device, and the tooling bearing device described above are the preferred structural forms in this embodiment, and it does not limit the use of other structures that can achieve the same functions.

[0106] According to another aspect of the present invention, a method for series welding of solar cells is further provided. The method for series welding of solar cells includes:

[0107] Laying the i-th solar cell on the welding conveying device, and laying the i-th group of solder ribbons on the i-th solar cell. The latter half of the i-th group of solder ribbons covers the grid lines on the upper surface of the i-th solar cell, and the former half of the i-th group of solder ribbons covers the grid lines on the upper surface of the (i - 1)-th solar cell, where i > 1;

[0108] Pressing and positioning the latter half of the i-th group of solder ribbons;

[0109] Controlling the welding conveying device to step forward by i + 1, and continuing to execute the step of laying the i-th solar cell on the welding conveying device.

[0110] Among them, after laying the i-th solar cell on the welding conveying device, when i = 1, the former half of the i-th group of solder ribbons is placed on the welding conveying device, and the latter half covers the grid lines on the upper surface of the i-th solar cell; the solder ribbon head positioning device presses and positions the former half of the i-th group of solder ribbons.

[0111] The following describes the specific process of producing a solar cell string by using the solar cell series welding equipment and the solar cell series welding method provided by the present invention.

[0112] Place the first solar cell 21 on the welding conveying device 100;

[0113] Respectively carry the head and tail of the first group of solder ribbons 11 through the first handling device 300 and the second handling device 400, stack and weld the latter half of the first group of solder ribbons 11 on the positive electrode line A of the first solar cell 21, and the former half ( Figure 2 the protruding section 111 therein) is laid on the welding conveying device 100;

[0114] Among them, the second handling device 400 first puts down and moves away the solder ribbon head to give way to the solder ribbon head positioning device 700; the solder ribbon head positioning device 700 presses and positions the protruding section 111 of the first group of solder ribbons 11 laid on the welding conveying device 100 through the pressing rod mechanism 702;

[0115] Then, the first handling device 300 puts down the tail of the solder tape, and the tooling handling device 600 transports the pressing tooling 900 to press the tail (the second half) of the first group of solder tapes 11.

[0116] Provide the second solar cell 22 and rotate the second solar cell 22 by 180° relative to the first solar cell 21.

[0117] The first handling device 300 and the second handling device 400 jointly transport the second group of solder tapes 12. The first half of the second group of solder tapes 12 is placed on the negative line B of the first solar cell 21, and the second half of the second group of solder tapes 12 is placed on the positive line A of the second solar cell 22.

[0118] The tooling handling device 600 transports the pressing tooling 900 to press the tail of the second group of solder tapes 12.

[0119] The welding device 200 welds the solder tapes on the first solar cell 21 to the first solar cell 21. During the welding process, the first solder tape pressing device and the second solder tape pressing device extend below the welding device 200 to press two positions in the length direction of the solder tapes laid on the first solar cell 21.

[0120] The welding and conveying device 100 makes a step and sequentially and cyclically lays the third solar cell 23 and the third group of solder tapes 13 and performs welding, so that the individual solar cells are connected in series.

[0121] Among them, during the welding process of the welding device 200, each time one solar cell is welded, when welding, solder tapes are laid on both the positive line and the negative line of the solar cell.

[0122] Those of ordinary skill in the art to which the present invention pertains should understand that the specific structures and process procedures shown in the above specific implementation part are merely exemplary and not restrictive. Moreover, those of ordinary skill in the art to which the present invention pertains can combine the various technical features shown above in various possible ways to form new technical solutions, or make other modifications, and all fall within the scope of the present invention.

Claims

1. A cell string welding device, characterized in that, the cell string welding device is used for the string welding connection of back contact cells, and the cell string welding device includes: a welding conveying device for conveying cells and solder tapes, and the cells are placed on the welding conveying device with their backs facing up; a solder tape handling device configured to handle the heads and tails of a set of solder tapes and transport the set of solder tapes to the cells to be welded on the welding conveying device. The solder tape handling device includes a first handling device and a second handling device arranged at a relatively spaced interval. The first handling device and the second handling device respectively clamp the two ends of the same set of solder tapes and transport the clamped solder tapes to the welding conveying device. Each of the first handling device and the second handling device includes a solder tape clamping mechanism for clamping the solder tape, a front-back driving mechanism for driving the solder tape clamping mechanism to move back and forth along the conveying direction of the welding conveying device, a lifting driving mechanism for driving the solder tape clamping mechanism to lift, and a lateral driving mechanism for driving the solder tape clamping mechanism to move in a lateral direction perpendicular to the conveying direction of the welding conveying device; a solder tape pressing device configured to press at least two positions in the length direction of the solder tape placed on the welding conveying device to be welded; a welding device located at the welding station for welding the solder tape on the welding conveying device at the welding station to the cell; Lay the i-th cell on the welding conveying device, and lay the i-th set of solder tapes on the i-th cell. The second half of the i-th set of solder tapes covers the grid lines on the upper surface of the i-th cell, and the first half of the i-th set of solder tapes covers the grid lines on the upper surface of the (i - 1)-th cell, where i is greater than 1; Press and position the second half of the i-th set of solder tapes; Control the welding conveying device to step forward by i + 1, and continue to execute the step of laying the i-th cell on the welding conveying device as described above.

2. The cell string welding device according to claim 1, characterized in that, the solder tape pressing device includes a solder tape head positioning device for pressing a set of solder tapes at the head of the cell string to be welded.

3. The cell string welding device according to claim 2, characterized in that, the solder tape head positioning device includes a pressing rod mechanism and a pressing rod moving mechanism for driving the pressing rod mechanism to move along the conveying direction of the welding conveying device; wherein, the pressing rod mechanism includes a pressing rod for pressing the solder tape and a pressing rod lifting mechanism for driving the pressing rod to lift.

4. The cell string welding device according to claim 1, characterized in that, the solder tape pressing device further includes a pressing tooling and a tooling handling device, and the tooling handling device is configured to transport the pressing tooling to the solder tape to be welded carried by the welding conveying device.

5. The cell string welding device according to claim 4, characterized in that, the tooling handling device includes a tooling clamping mechanism capable of clamping the pressing tooling and a tooling handling lifting mechanism for driving the tooling clamping mechanism to lift; The cell string soldering equipment further includes a lateral moving mechanism for driving the tooling handling device to move in a direction perpendicular to the conveying direction of the soldering conveying device, and a longitudinal moving mechanism for driving the tooling handling device to move back and forth along the conveying direction of the soldering conveying device.

6. The cell string soldering equipment according to claim 4, wherein, a groove for limiting the solder tape is provided at the bottom of the pressing tooling; the pressing tooling is made of a magnetic adsorption material, and a magnet for adsorbing and positioning the pressing tooling is provided on the soldering conveying device.

7. The cell string soldering equipment according to claim 4, wherein, the cell string soldering equipment further includes a tooling carrying device for carrying the pressing tooling, and the tooling handling device is arranged to be able to move to the tooling carrying device and carry the pressing tooling from the tooling carrying device.

8. The cell string soldering equipment according to any one of claims 1-7, wherein, the solder tape pressing device includes a first solder tape pressing device and a second solder tape pressing device that can be lifted and are provided on the soldering device, and the first solder tape pressing device and the second solder tape pressing device are arranged at intervals below the soldering device to respectively press two positions in the length direction of the solder tape to be soldered.

9. The cell string soldering equipment according to claim 1, wherein, after laying the i-th cell on the soldering conveying device, when i = 1, the first half of the i-th group of solder tapes is placed on the soldering conveying device, and the second half covers the grid lines on the upper surface of the i-th cell; the first half of the i-th group of solder tapes is pressed and positioned by the solder tape head positioning device.

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