WO2020043017A1 - Solar cell panel serial welding system - Google Patents

Abstract

A solar cell panel serial welding system, comprising a flat welding belt loading apparatus (30), a solar cell panel loading apparatus (20), an irregularly-shaped welding belt loading apparatus (10), a welding platform (40), and a heating apparatus (50). The irregularly-shaped welding belt loading apparatus (10) comprises a first moving module (12) and a holder (11) mounted on the first moving module (12). The holder (11) comprises a fetching element (111) having a first positioning groove (1111) and a first pressing needle (112). The welding platform (40) comprises a body (41) having a second positioning groove (411) and a first suction airhole (412). When an irregularly-shaped welding belt (W) is placed in the first positioning groove (1111) of the holder (11), the first pressing needle (112) presses downwards against the irregularly-shaped welding belt (W), the first moving module (12) drives the holder (11) to move and to transport the irregularly-shaped welding belt (W) to the second positioning groove (411) of the body (41), and a second suction airhole (4111) at the bottom of the second position groove (411) holds the irregularly-shaped welding belt (W) by suction. A solar cell panel is transported to the body (41) and held by the first suction airhole (412) by suction. The irregularly-shaped welding belt (W) is aligned with an interconnecting electrode on either side of the solar cell panel. A flat welding belt is transported on the solar cell panel and is aligned with an interconnecting electrode on the other side of the solar cell panel.

Description

Solar cell string welding system Technical field

The invention relates to the field of photovoltaics, in particular to a solar cell string welding system.

Background technique

A plurality of parallel silver interconnect electrodes (interconnect electrodes for short) are arranged symmetrically on both sides of the solar cell, and a plurality of solar cells can be connected by bonding the welding tape to the interconnect electrodes of two adjacent solar cells. Connected together. Specifically, the solar cells and the welding strips are respectively placed and positioned on the platform of the string welding machine, so that the solar cells and the welding strips are aligned, and then the high-temperature heating and welding are performed to weld the solar cells in series.

Traditional solder ribbons are mostly tin-plated copper flat ribbons (also known as flat solder ribbons). However, with the development of the industry, there are other shapes of welding tapes, also called special-shaped welding tapes. For example, triangular welding tapes are the most common type of special-shaped welding tapes. However, the traditional string welding machine is only suitable for welding between flat ribbons and solar cells, and cannot be used for welding between profiled ribbons and solar cells. Taking the triangular welding tape as an example, due to its shape, the triangular welding tape cannot be restricted and positioned on the platform, it is easy to roll and move during the transfer process, and it is also difficult to align with the interconnecting electrodes of the solar cell. On the other hand, because the cross-sectional area of the triangular welding tape is smaller, it cannot be maintained by stretching and straightening like the traditional flat welding tape. And because of the plasticity of the triangle welding tape, if there is no other measure to restrict the positioning, the triangle welding tape is very easy to bend and deform even after being stretched and straightened.

Summary of the Invention

The object of the present invention is to provide a solar cell string welding system, which solves the problem that the existing string welding machine cannot be used for string welding between a profiled ribbon and a solar cell.

In order to solve the above problems, the present invention provides a solar cell string welding system, which includes a flat ribbon feeding device, a solar cell feeding device, a special-shaped ribbon feeding device, a welding platform, and a heating device. The special-shaped welding tape feeding device includes a gripper and a first movement module. The gripper includes a gripper and a first pressure pin. The gripper has a first positioning groove, a shape of the first positioning groove, and a shape of the shaped welding tape. It is matched so that the special-shaped welding tape can be operatively restricted in the first positioning groove; the first pressure pin is located on the top of the first positioning groove and can be movably pressed against the first positioning groove, and the gripper is installed on the first movement module. The welding platform includes a body. The body has a second positioning groove and a first suction air hole. The shape of the second positioning groove matches the shape of the special-shaped welding tape, so that the special-shaped welding tape is operatively limited in the second positioning groove. A bottom of the positioning groove has a second adsorption air hole;

After the special-shaped welding tape is placed in the first positioning groove of the gripper, the first pressing pin presses down the special-shaped welding tape, and the first movement module drives the gripper to move and transport the shaped welding tape to the second positioning groove of the body. The welding strip is adsorbed on the second positioning groove through the second adsorption air hole; the solar cell sheet feeding device transports the solar cell to the body of the welding platform, so that the solar cell is adsorbed on the welding platform through the first adsorption air hole, and the special-shaped welding strip and solar energy The interconnect electrodes on one side of the cell are aligned; the flat ribbon feeding device transfers the flat ribbon to the solar cell to align the flat ribbon and the interconnect electrode on the other side of the solar cell;

The heating device heats the solar cell sheet, so that the flat soldering strip and the special-shaped soldering strip are welded together with the solar cell sheet.

According to an embodiment of the present invention, the grasping member includes a frame and a restricting portion. The restricting portion is L-shaped and integrally formed on the bottom of the frame. The first positioning groove is provided on the restricting portion. The first pressure needle is mounted on the frame.

According to an embodiment of the present invention, the number of the restricting portion and the first pressing needle is multiple. The restricting portion corresponds to the first pressing needle one by one. The restricting portion is distributed at two intervals, and two restrictions of each group. Parts are located on opposite sides of the frame.

According to an embodiment of the present invention, the gripper includes a first air cylinder, the first air cylinder is mounted on the frame and connected to the first pressure needle, and the first air cylinder pushes the first pressure needle to press down the first positioning groove; the gripper further includes a plurality of suction cups And a plurality of second cylinders, the second cylinders are mounted on the frame and connected to the suction cups in a one-to-one correspondence.

According to an embodiment of the present invention, the special-shaped welding tape feeding device further includes a stretching and straightening mechanism and a cutting mechanism.

The stretching and straightening mechanism includes a fixing clip and a set of movable clips. The fixing clip has a third positioning groove matching the shape of the shaped welding tape and can operatively clamp one end of the shaped welding tape. The movable clip has a shape similar to that of the shaped welding tape. The matching fourth positioning slot, the movable clamp can operatively clamp the other end of the shaped welding tape and move and drag the shaped welding tape to stretch and straighten the shaped welding tape.

The cutting mechanism cuts the profiled welding tape stretched and aligned to a predetermined length, and the gripper conveys the cut profiled welding tape to the welding platform.

According to an embodiment of the present invention, the number of the first adsorption pores is plural, the first adsorption pores are formed in multiple rows and are distributed on the body of the welding platform, the number of the second positioning grooves is plural, and the second positioning grooves are spaced apart and parallel to each other. It is provided that each second positioning groove has a plurality of second adsorption air holes arranged at intervals, and the second positioning grooves and the rows of first adsorption air holes are alternately distributed on the body of the welding platform.

According to an embodiment of the present invention, the body further has a first main air passage and a second main air passage, the first main air passage is connected to the first adsorption air hole, and the second main air passage is connected to the second adsorption air hole; the welding platform further includes The heating device and the temperature measuring device are both mounted on the body.

According to an embodiment of the present invention, there are a plurality of welding platforms, and the welding platforms are connected in series side by side.

According to an embodiment of the present invention, the solar cell string welding system further includes a pressing mechanism, and the pressing mechanism presses the flat ribbon, the special-shaped ribbon and the solar cell together before the heating device heats the solar cell. The pressing mechanism includes a fixing device, a plurality of second pressing needles, a plurality of third pressing needles, and a second movement module.

The second pressure pin is installed on the fixing device, and the second pressure pin can be operated to make contact with the flat welding tape so that the flat welding tape and the special-shaped welding tape are pressed together with both sides of the solar cell sheet. The end surface of the welding strip contact is flat;

The third pressure pin is installed on the fixing device, and the third pressure pin can be operated to make contact with the overlapping position of the flat welding strip and the special-shaped welding strip between the adjacent two solar cells. The third pressure pin and the flat welding strip and The end contacted by the overlapping position of the profiled welding tape is wedge-shaped.

The fixing device is installed on the second movement module, and the second movement module drives the second pressure needle and the third pressure needle to press down or rise in the axial direction.

According to an embodiment of the present invention, the second pressing needle and the third pressing needle form a plurality of rows distributed on the fixing device, and each row is formed by a plurality of second pressing needles and a plurality of third pressing needles.

According to an embodiment of the present invention, the solar cell string welding system further includes a blanking device and an EL detection device. After the welding is completed, the blanking device first grabs the solar cell to the EL detection device to detect a welding defect, and then blanks the material. The device grasps the solar cell sheet to a predetermined position and flips the solar cell sheet at a predetermined angle for manual visual inspection.

Compared with the prior art, this technical solution has the following advantages:

In the invention, the first positioning groove matching the shape and the special-shaped welding tape is arranged on the gripping piece of the gripper to place the special-shaped welding tape, and the special-shaped welding tape is restricted, and at the same time, the first pressure needle is used to hold the special-shaped welding tape. A special-shaped welding tape in a positioning slot can ensure that the special-shaped welding tape does not move, flip and distort during the handling and loading process. In this way, the problem that the conventional feeding device cannot feed the special-shaped welding tape is solved.

Correspondingly, the shaped welding tape is placed in the body of the welding platform by the second positioning groove matching the shape of the shaped welding tape, and the shaped welding tape is adsorbed through the second adsorption air hole located in the second positioning groove. Limitation of the special-shaped welding tape to ensure that the special-shaped welding tape cannot move, flip and twist on the welding platform. In this way, the gripper of the feeding device of the profiled welding tape can grasp the profiled welding tape and transfer it to the second positioning groove of the welding platform after grasping it. Next, the solar cells and flat ribbons are transported and placed on the welding platform, and the profiled ribbons and flat ribbons are aligned with the interconnecting electrodes on both sides of the solar cell, of which only one pair of interconnecting electrodes of the solar cell is needed. The second positioning groove on the welding platform should be aligned to achieve the positioning and alignment of the profiled welding tape and the solar cell. In summary, the present invention realizes the feeding of the shaped welding tape by setting the first positioning groove and the second positioning groove that are matched with the shape of the shaped welding tape on the gripper and the welding platform of the feeding device of the shaped welding tape, respectively. The alignment and positioning of the special-shaped welding tape and the solar cell are facilitated, and the problems that the conventional string welding machine cannot feed the special-shaped welding tape and the positioning and alignment of the special-shaped welding tape and the solar cell are solved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective structural schematic view of a solar cell string welding system provided by the present invention;

2 is a schematic view of a three-dimensional structure of the solar cell string welding system provided by the present invention after some external frames are removed and simplified for convenience of presentation and description;

3 is a schematic structural diagram of a special-shaped welding tape feeding device of a solar cell string welding system provided by the present invention;

4 is a partial structural schematic view of the profiled welding tape feeding device in FIG. 3, showing the structure of a gripper and a first movement module;

5 is a schematic structural view of the gripper of the profiled welding tape feeding device in FIG. 3 from another perspective;

6 is a schematic structural view of the gripper of the special-shaped welding tape feeding device in FIG. 3 from another perspective;

7 is a perspective view of a three-dimensional structure of a welding platform of the solar cell string welding system provided by the present invention, showing a series connection manner of a plurality of welding platforms;

8 is a schematic perspective view of a single welding platform in a solar cell string welding system provided by the present invention;

FIG. 9 is a partially enlarged view of the position I in FIG. 8;

10 is a side view of a single welding platform in the solar cell string welding system provided by the present invention, showing that the special-shaped welding tape W is restricted to the second positioning groove;

FIG. 11 is a schematic view of the three-dimensional structure of the heating device and the pressing mechanism of the solar cell string welding system provided by the present invention, and shows the cooperation modes of the heating device, the pressing mechanism, and the welding platform;

12 is a partial structural schematic view of a pressing mechanism of a solar cell string welding system provided by the present invention;

FIG. 13 is a schematic perspective view of the third pin of the pressing mechanism of the solar cell string welding system provided by the present invention.

detailed description

The following description is only used to disclose the present invention to enable those skilled in the art to implement the present invention. The embodiments in the following description are merely examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other schemes without departing from the spirit and scope of the invention.

The invention provides a solar cell string welding system for welding and connecting a plurality of solar cells in series to form a solar cell string. In particular, the solar cell string welding system can realize string welding of solar cells by using flat ribbons and special-shaped ribbons, that is, feeding of the special-shaped ribbons and positioning and alignment with the solar cells. Specifically, the solar cell string welding system includes a special-shaped ribbon feeding device 10, a solar cell charging device 20, a flat ribbon feeding device 30, a welding platform 40, and a heating device 50.

The special-shaped welding tape feeding device 10 is used for feeding the special-shaped welding tape, that is, the special-shaped welding tape is transported to the welding platform 40 so that the interconnecting electrodes on one side of the special-shaped welding tape and the solar cell are aligned. The special-shaped welding tape feeding device 10 includes a gripper 11 and a first movement module 12. In addition, the special-shaped welding tape feeding device 10 further includes a first storage mechanism 14.

It should be noted that, in the conventional technology, the welding tape used for the solar cell welding in series is a long and flat sheet-shaped body with a rectangular cross section. This type of welding tape is called a flat welding tape. In the disclosure of the present invention, the special-shaped welding tape refers to a welding tape with a cross-section other than a flat welding tape, such as a triangle or a circle. The welding tape with a triangular cross section is also called a fillet welding tape or a special-shaped welding tape, which is one of the special-shaped welding tapes.

The first storage mechanism 14 is used to store the shaped welding tape. In this embodiment, the first storage mechanism 14 includes a plurality of I-shaped wheels, and the shaped welding tape is wound around the I-shaped wheels in order to facilitate the processing of the shaped welding tape. Drag and drop lines and guides.

The gripper 11 grips the shaped welding tape from the first storage mechanism 14. The gripper 11 includes a gripping member 111 and a first pressing needle 112. The gripping member 111 has a first positioning groove 1111. The shape of the first positioning groove 1111 and the shape of the profiled welding tape are matched so that the profiled welding tape is operatively limited in the first positioning groove 1111. That is, the shape of the first positioning groove 1111 is different according to the shape of the profiled welding tape used, and the profiled welding tape cannot be arbitrarily moved, twisted, deformed, or reversed in the first positioning groove 1111. For example, in this embodiment, the special-shaped welding tape is a W-shaped welding tape, and the first positioning groove 1111 is a V-shaped groove. When the special-shaped welding tape feeding device 10 works, the special-shaped welding tape W is placed in the first positioning groove 1111. A vertex of the special-shaped welding tape W faces downward, and one side of the special-shaped welding tape W is kept horizontal. In this way, based on the shape of the first positioning groove 1111 itself, the profiled welding tape W can be dropped into and fit into the first positioning groove 1111 and cannot be moved and twisted.

For another example, in another embodiment, the special-shaped welding tape W is a circular welding tape, that is, the cross-section of the special-shaped welding tape W is circular, and the first positioning groove 1111 is a semicircular groove, so that the special-shaped welding tape W It can fit into the first positioning groove 1111 and fit into it. However, for convenience of explanation, the following description mainly uses the special-shaped welding tape W and the triangular welding tape as an example to explain the principle of how the special-shaped welding tape feeding device 10 loads the triangular welding tape.

The first pressing pin 112 is located on the top of the first positioning groove 1111 and can press the first positioning groove 1111 movably to press the profiled welding tape W placed in the first positioning groove 1111. The end of the end of the first pressure pin 112 that is in contact with the special-shaped welding tape W is flat, so as to increase the contact area with the special-shaped welding tape W, which is convenient for compaction. Optionally, the first pressure needle 112 is a pneumatic pressure needle, and the pneumatic pressure needle has the advantage of rapid and sensitive response.

Further, in this embodiment, the grasping member 111 includes a frame 1112 and a restricting portion 1113. The frame 1112 is a hollow rectangular frame. The restricting portion 1113 is L-shaped and is integrally formed at the bottom of the frame 1112. The first positioning groove 1111 The first pressure needle 112 is provided on the restricting portion 1113 and is attached to the frame 1112.

The gripper 11 further includes a first air cylinder 113, which is mounted on the frame 1112 and connected to the first pressure needle 112. The first air cylinder 113 pushes the first pressure needle 112 down to the first positioning groove 1111, so that the first pressure The needle 112 presses the profiled welding tape W placed in the first positioning groove 1111. However, in other embodiments, other power modes may be adopted, such as controlling and pushing the movement of the first pressing needle 112 by electric means.

Further, the number of the restricting portion 1113 and the first pressure pin 112 are multiple, the number of the restricting portion 1113 and the first pressure pin 112 are one-to-one, and the number of the first cylinder 113 is also multiple and equal to the number of the first pressure pin 112. One correspondence. The restricting portions 1113 are distributed at two intervals. The two restricting portions 1113 of each group are located on opposite sides of the frame 1112. The two ends of each profiled welding tape W are respectively supported and restricted to two in the same group. Restriction section 1113. In this way, the gripper 11 can grasp and restrict a plurality of profiled welding tapes W at one time, and the different positioning positions of the profiled welding tapes W are restricted by the first positioning grooves 1111 of a set of two restricting portions 1113 to ensure that the profile is deformed during transportation. The balance and stability of the welding strip W ensure that the deformed welding strip W is not distorted.

It can be understood that, in the present invention, each profiled welding tape W is suspended by using spaced-apart restriction portions 1113, so that the restriction portion 1113 only contacts a few points of the profiled welding tape W, compared with the entire profiled welding tape. In the case where W is in contact with the restricting portion 1113, the contact surface of the profiled welding tape W and the restricting portion 1113 in the present technical solution is less, and it is possible to minimize the scratch or bump of the shaped welding tape W by the restricting portion 1113.

In practical applications, the number of groups of the restricting portions 1113 is the same as the number of the special-shaped welding tapes W fed at a time. During the solar cell welding process, the number of interconnected electrodes of different specifications of solar cells is different, and each solar cell corresponds to a different number of profiled ribbons W to be welded. Since the required number of profiled welding tapes W of a single solar cell are transported at a time each time the material is loaded, the number of sets of the restricting portion 1113 can be set according to the specifications of the solar cell, that is, the shape of a single feeding The number of welding tapes W is the same.

As shown in FIG. 4, the gripper 11 further includes a plurality of suction cups 114 and a plurality of second air cylinders 115, and each of the suction cups 114 is disposed between two restricting portions 1113 of the same group. The second cylinder 115 is mounted on the frame 1112 and is connected to the suction cup 114 in a one-to-one correspondence.

The gripper 11 is mounted on the first motion module 12. After the special-shaped welding tape W is placed in the first positioning groove 1111 of the gripper 11, the first pressure pin 112 presses down the special-shaped welding tape W, and the first movement module 12 drives the gripper 11 to move and transports the special-shaped welding tape W to Welding platform 40.

The first motion module 12 includes a horizontal moving electric cylinder 121 and a vertical moving electric cylinder 122. The horizontal movement electric cylinder 121 controls the gripper 11 to move in the horizontal direction, and the vertical movement electric cylinder 122 controls the gripper 11 to move in the vertical direction, thus realizing the movement of the gripper 11 in both horizontal and vertical directions.

During operation, the first movement module 12 first drives the gripper 11 to move to the feeding position of the shaped welding tape W, and the gripper 111 of the gripper 11 grips the shaped welding tape W, so that the shaped welding tape W falls into the first position. Slot 1111. Then the first air cylinder 113 drives the first pressure needle 112 to press down the special-shaped welding tape W, so that the special-shaped welding tape W is confined in the first positioning groove 1111 and cannot be moved and twisted, and the second air cylinder 115 operates so that the suction cup 114 sucks Special-shaped welding tape W. Then the first movement module 12 drives the gripper 11 to move to the welding platform 40. The first cylinder 113 releases the pressure pin 112 to raise the pressure pin 112. At this time, the first pressure pin 112 no longer holds the special-shaped welding belt W, and the special-shaped welding is performed. The belt W is placed in contact with the welding platform 40, but due to the action of the second cylinder 115, the suction cup 114 still sucks the special-shaped welding tape W, so that the special-shaped welding tape W is not brought up or slightly arched as the first pressure needle 112 rises. Warping. Finally, the release of the second cylinder 115 causes the suction cup 114 to release the special-shaped welding tape W, so that the special-shaped welding tape W smoothly falls on the welding platform 40.

It can be understood that the shape of the first positioning groove 1111 coincides with the profiled welding tape W, so the profiled welding tape W cannot be easily moved, rolled, twisted and deformed in the first positioning groove 1111, thus realizing the profiled welding tape W The positioning can avoid distortion of the special-shaped welding tape W during the transportation. In addition, the special-shaped welding tape W is restricted in the first positioning groove 1111, and is pressed down to the special-shaped welding tape W by the first pressing needle 112, so that the special-shaped welding tape W is firmly fixed in the first positioning groove 1111, which can ensure the transportation The profiled welding tape W will not fall during the process.

In addition, the restricting portion 1113 in this embodiment adopts an L-shape, and the special-shaped welding tape W can be easily put into the first positioning groove 1111 from the side of the L-shaped restricting portion 1113, and vice versa. The restriction portion 1113 is removed and placed at the target position. This design is simple and convenient.

Optionally, there are multiple grippers 11, and each gripper 11 is mounted on the first motion module 12. In this embodiment, the number of the grippers 11 is four, and the four grippers 11 are respectively installed on the first motion module 12 in groups of two. At the same time, two sets of profiled welding tapes W are grasped and handled.

Further, the special-shaped welding tape feeding device 10 further includes a first stretching and alignment mechanism 15 and a first cutting mechanism 16. The first stretching and alignment mechanism 15 includes a fixing clip 151 and a set of movable clips 152. The fixing clip 151 has a third positioning groove matching the shape of the special-shaped welding tape W and can operatively clamp one end of the special-shaped welding tape W. The movable clip 152 has a fourth positioning groove matching the shape of the shaped welding tape W. The movable clip 152 can operatively clamp the other end of the shaped welding tape W and move and drag the shaped welding tape W to pull the shaped welding tape W. Stretch straight.

The first cutting mechanism 16 cuts the profiled welding tape W after being stretched and aligned to a predetermined length, and the gripper 11 conveys the cut profiled welding tape W to the welding platform 40.

The solar cell sheet feeding device 20 loads the solar cell sheet, that is, the solar cell sheet is transported to the welding platform 40 so that the interconnecting electrodes of the profiled welding tape W and one side of the solar cell sheet are aligned. The solar cell chip feeding device 20 includes a feeding flower basket, a third motion module, a coarse and translation stage, a visual inspection station, and a flux spraying mechanism. The feeding basket is a special container for solar cells, and a stack of several solar cells can be placed. The third motion module has a suction cup. The third motion module sucks the solar cells one by one from the feeding basket and transfers them to the coarse and translation stage. Then, the third motion module moves the solar cells from the rough and translation stage. The stage is carried to a visual inspection stage to detect whether the solar cell is damaged or otherwise defective, and the position information of the interconnecting electrodes of the solar cell is measured for accurate positioning and placement. During this handling process, the flux spraying mechanism sprays a certain amount of flux to the interconnecting electrodes on both sides of the solar cell sheet to facilitate subsequent welding. Finally, the third motion module accurately positions the solar cell on the welding platform 40.

The flat ribbon feeding device 30 is used to load the conventional flat ribbon, that is, the flat ribbon is transferred to the welding platform 40, so that the interconnect electrodes on the other side of the flat ribbon and the solar cell are aligned. The flat welding tape feeding device 30 includes a second storage mechanism, a second stretching and alignment mechanism, a second cutting mechanism, and a conveying mechanism. The second storage mechanism is used to store the flat welding tape. In this embodiment, the second storage mechanism includes a plurality of I-shaped wheels, and the flat welding tape is wound on the I-shaped wheels in order to facilitate the dragging of the flat welding tape. Put the line. The second stretching and straightening mechanism is a moving gripper, and the second stretching and straightening mechanism drags the flat welding tape from the second storage mechanism and straightens the flat welding tape. The second cutting structure cuts the flattened flat welding tape into a predetermined length. The transporting mechanism transports the cut flat soldering tape to the welding platform 40, and aligns the interconnecting electrodes of the flat soldering tape and one side of the solar cell sheet to facilitate subsequent string welding.

The welding platform 40 includes a body 41 having a second positioning groove 411 and a first suction air hole 412. The shape of the second positioning groove 411 matches the shape of the special-shaped welding tape W, so that the special-shaped welding tape W is operatively limited to In the second positioning groove 411. That is, the shape of the second positioning groove 411 is different according to the shape of the profiled welding tape W used, and the profiled welding tape W cannot be arbitrarily moved, twisted, deformed, or turned in the second positioning groove 411. For example, in this embodiment, the special-shaped welding tape W is a triangular welding tape, and the second positioning groove 411 is a V-shaped groove. In this way, the special-shaped welding tape W can be dropped into and fit to the second positioning groove 411 that is V-shaped. in.

For another example, in another embodiment, the special-shaped welding tape W is a circular welding tape, that is, the cross-section of the special-shaped welding tape W is circular, and the second positioning groove 411 is a semi-circular groove, so that the special-shaped welding tape W It can fit into the second positioning groove 411 and is restricted. However, for convenience of explanation, the following description mainly uses a triangular welding tape with a special-shaped welding tape W, and the second positioning groove 411 is a V-shaped groove as an example to illustrate the principle of the present invention.

The bottom of the second positioning groove 411 has a second adsorption air hole 4111, and the second adsorption air hole 4111 is used for adsorbing the special-shaped welding tape W placed in the second positioning groove 411. It can be understood that the adsorption effect of the second adsorption air hole 4111 further guarantees that the profiled welding tape W is restricted in the second positioning groove 411, and the profiled welding tape W is fixed in position, and cannot be moved, twisted, deformed or flipped at will, which greatly improves Accuracy of W profile positioning.

Optionally, the number of the second positioning grooves 411 is plural, and the second positioning grooves 411 are spaced apart and arranged in parallel. Each second positioning groove 411 has a plurality of second adsorption air holes 4111 arranged at intervals. The number of the second positioning grooves 411 is the same as the number of the interconnecting electrodes of the soldered solar cells, and the pitch of the second positioning grooves 411 is the same as the pitch of the interconnecting electrodes of the soldered solar cells. In practical applications, the number of the second positioning grooves 411 and the center distance can be reasonably set according to the specifications of the solar cell sheet. For example, in this embodiment, the number of the second positioning grooves 411 is 4-15, and the center distance between every two adjacent second positioning grooves 411 is 10mm-30mm; the second adsorption air holes 4111 are equally spaced. In the second positioning groove 411, the number of the second adsorption air holes 4111 is 5-20, and the diameter of the second adsorption air holes 4111 is 0.2 mm-0.5 mm.

The first adsorption air hole 412 is used to adsorb the solar cell sheet to the body 41 so that the interconnected electrodes of the solar cell sheet and the attracted profiled welding tape W are aligned. Optionally, in this embodiment, the number of the first adsorption air holes 412 is multiple, and the first adsorption air holes 412 form a plurality of rows spaced apart from the body 41, a second positioning groove 411, and the first adsorption air holes in a row. 412 is distributed at the body 41 at alternate intervals. That is, a row of first adsorption air holes 412 and a second positioning groove 411 are alternately arranged on the body 41 in this order.

Further, the body 41 further has a first main air passage 413 and a second main air passage 414, the first main air passage 413 and the first adsorption air hole 412 communicate with each other, and the second main air passage 414 and each second positioning groove 411 The second adsorption air hole 4111 is communicated. Both the first main airway 413 and the second main airway 414 are used to communicate with external equipment to provide negative pressure. In this way, the first main airway 413 and the second main airway 414 are equivalent to the first adsorption air holes 412 and The second adsorption air hole 4111 provides a negative pressure air flow passage. It can be understood that the first adsorption air holes 412 for adsorbing solar cells are not connected with the second adsorption air holes 4111 for adsorbing the shaped welding tape W, and the first adsorption air holes 412 and the second adsorption air holes 4111 are independent of each other. The ground is in communication with the first main air passage 413 and the second main air passage 414, which can facilitate the adsorption operation of the solar cell sheet and the profiled welding tape W at different timings.

Further, the welding platform 40 further includes a heating device 42, and the heating device 42 is mounted on the body 41. The body 41 also has a first mounting hole 415. The heating device 42 is a heating rod. The heating device 42 is mounted in the first mounting hole 415.

The welding platform 40 further includes a temperature measuring device 43, and the temperature measuring device 43 is mounted on the body 41. The body 41 also has a second mounting hole 416, the temperature measuring device 43 is a thermocouple, and the temperature measuring device 43 is mounted in the second mounting hole 416.

In this embodiment, in order to ensure the temperature uniformity of the welding platform 40, the number of the heating devices 42 and the temperature measuring devices 43 are multiple. In order to facilitate the assembly and layout of the welding platform 40, the first main air passage 413, the second main air passage 414, the heating device 42, and the temperature measurement device 43 are all disposed on the side of the body 41.

In this embodiment, there are a plurality of welding platforms 40, and the welding platforms 40 are connected in series side by side, that is, the welding platforms 40 are connected in a row. Any two adjacent welding platforms 40 are locked by fasteners such as screws to ensure that they do not move relative to each other. The second positioning grooves 41 of any two adjacent welding platforms 40 are aligned on a straight line in a one-to-one correspondence. In the actual assembly process, if the center lines of the two second positioning grooves 41 are aligned on a straight line, it can be explained that the two second positioning grooves 41 are aligned on a straight line.

The number of welding platforms 40 depends on the number of strings of solar cells that are ultimately required. For example, if a single string of solar cells contains 10 solar cells, then 10 welding platforms 40 are required to be connected in series. The greater the number of welding platforms 40 connected in series, the greater the number of strings of solar cells that can be prepared by welding. Optionally, the number of welding platforms 40 is ten or twelve.

During work, the special-shaped welding tape is first loaded, and a plurality of special-shaped welding tapes are transported and placed on the welding platform 40. Specifically, after the special-shaped welding tape is placed in the first positioning groove 1111 of the gripper 11, the first pressure needle 112 presses down the special-shaped welding tape, and the first movement module 12 drives the gripper 11 to move and transport the special-shaped welding tape to The second positioning groove 411 of the body 41 and the special-shaped welding tape are attracted to the second positioning groove 411 through the second adsorption air hole 4111.

Then, the solar cell is loaded. The solar cell feeding device 20 transports the solar cell to the body 41 of the welding platform 40, and the light receiving surface of the solar cell faces downward, so that the solar cell is adsorbed on the welding platform through the first adsorption air hole 412. 40 and the interconnecting electrodes on one side of the profiled ribbon and the solar cell are aligned.

Then, the flat ribbon is fed, and the flat ribbon feeding device 30 transfers the flat ribbon to the solar cell so that the flat ribbon and the interconnection electrode on the other side of the solar cell are aligned. This completes the feeding of the profiled ribbon, flat ribbon, and solar cell.

The heating device 50 heats the solar cell sheet, so that both the flat ribbon and the special-shaped soldering strip are welded to the solar cell sheet. In this embodiment, the heating device 50 includes an infrared light box 51 and a cooling device 52. The infrared light box 51 includes a plurality of infrared light tubes. The cooling device 52 is installed on the top of the infrared light box 51 to cool the infrared light box 51. Optionally, in this embodiment, the cooling device 52 is a fan.

The heating device 50 further includes a supporting frame 53 which stands on one side of the welding platform 40. Both the infrared light box 51 and the cooling device 52 are mounted on a support frame 53.

The solar cell string welding system further includes a pressing mechanism 60. The pressing mechanism 60 presses the flat welding strip, the special-shaped welding strip and the solar cell together before the heating device 50 heats the solar cell. The pressing mechanism 60 includes a fixing device 61, a plurality of second pressing needles 62, a plurality of third pressing needles 63, and a second movement module (not shown in the figure).

The fixing device 61 is used for mounting the second pressure needle 62 and the third pressure needle 63. The fixing device 61 includes a frame 611 and a plurality of beams 612. The frame 611 is a rectangular frame and is made of a metal material that is not easily deformed. The frame 611 has a plurality of spaced screw holes 6111. The screw holes 6111 are located on two opposite sides of the frame 611 in groups of two. Optionally, the number of groups of the threaded holes 6111 of the frame 611 is 5-15 groups, that is, the total number of the threaded holes 6111 is 10-30.

The number of beams 612 is the same according to the number of interconnecting electrodes on one side of the corresponding solar cell. Optionally, the number of beams 612 is 5-15. Two ends of each beam 612 are fixed to the threaded holes 6111 of the frame 611 by screws, respectively. The cross beams 612 are parallel and fixed to the frame 611 at intervals. The distance between two adjacent cross beams 612 is consistent with the distance between the interconnecting electrodes of the corresponding solar cell. The beam 612 has a plurality of spaced-apart through holes 6121.

The second pressure needles 62 are all fixed to the fixing device 61. Each of the second pressing pins 62 can be operated to make contact with the flat welding tape, so that the flat welding tape and the special-shaped welding tape are pressed together with both sides of the solar cell sheet. The end surface of the second pressure pin 62 and the flat welding strip is flat, that is, the end of the second pressure pin 62 is flat, so that the second pressure pin 62 can better contact and press the flat welding strip. Optionally, the inside of the second pressure pin 62 is hollow, that is, the second pressure pin 62 is a hollow pressure pin, which can reduce the heat absorption of the second pressure pin 62 itself when welding and heating the solar cell sheet after lamination.

The third pressing needles 63 are all fixed to the fixing device 61. Each of the third pressing pins 63 can be operated to contact the overlapping positions of the flat welding tape and the special-shaped welding tape between two adjacent solar cells. The end portion of the third pressure pin 63 that is in contact with the overlapping position of the flat welding tape and the special-shaped welding tape is wedge-shaped. The “wedge shape” means that the size of one end of the object gradually decreases to form a shape with a large size at one end and a small size at the other end. In this embodiment, the size of the end portion of the third pressure pin 63 that is in contact with the overlapping position of the flat welding tape and the special-shaped welding tape is gradually decreased from large, and is smaller as it approaches the end. Optionally, the width a of the end portion of the third pressure pin 63 in contact with the overlapping position of the flat welding strip and the special-shaped welding strip is 0.5 mm-1.5 mm.

In particular, the second pressing pin 62 and the third pressing pin 63 form a plurality of rows distributed on the fixing device 61. In this way, each row can be pressed with an interconnected electrode of the solar cell sheet and a corresponding flat soldering strip or special-shaped soldering strip. The second pressure pin 62 and the third pressure pin 63 are both mounted on the cross beam 612. In this way, the second pressure pin 62 and the third pressure pin 63 fixed on one beam 612 form a row. The second pressing needle 62 and the third pressing needle 63 correspond to form a plurality of rows of arrays on the plurality of beams 612.

Both the second pressure needle 62 and the third pressure needle 63 are installed in the through hole 6121. Each row is formed by a plurality of second press pins 62 and a plurality of third press pins 63, that is, each row includes the second press pin 62 and the third press pin 63. Both the second pressure needle 62 and the third pressure needle 63 can be operatively pressed or raised in an axial movement within the through hole 6121.

When the second pressure pin 62 and the third pressure pin 63 are pressed down, the second pressure pin 62 and the third pressure pin 63 apply a downward pressure to compress the flat ribbon, the special-shaped ribbon and the solar cell. When the second pressure pin 62 and the third pressure pin 63 are raised, the second pressure pin 62 and the third pressure pin 63 leave the flat welding tape, and the pressed state of the three flat welding tape, the special-shaped welding tape and the solar cell sheet is released.

In particular, the number of the third press pins 63 in each row is 1-3. This can ensure that the third pressing pin can be pressed to the gap position between two adjacent solar cells, that is, the overlapping position of the flat welding tape and the special-shaped welding tape, so as to avoid expansion due to subsequent high-temperature welding processes. As a result, the solar cells and flat ribbons or special-shaped ribbons are displaced and creeped.

The fixing device 61 is mounted on the second movement module, and the second movement module drives the second pressure needle 62 and the third pressure needle 63 to be pushed down or raised axially. That is, the second pressing needle 62 and the third pressing needle 63 are both moved up and down in the through hole 6121 through the second movement module. Optionally, the second motion module is a pneumatic or electric motion module.

The pressing mechanism 60 further includes a support frame 64 having a guide rail, and the second motion module is mounted on the guide rail of the support frame 64. The second movement module moves up and down along the guide rail of the support frame 64.

In application, the supporting frame 64 of the pressing mechanism 60 stands on one side of the welding platform 40, and the fixing device 61 is located on the top of the welding platform 40. The heating device 50 is also mounted on the support frame 64 of the pressing mechanism 60 and is located on the top of the fixing device 61.

The solar cell string welding system further includes a blanking device and an EL detection device. After the welding is completed, the blanking device first grabs the solar cell to the EL detection device to detect welding defects, and then the blanking device grabs the solar cell to The solar cell is turned at a predetermined position at a predetermined position for a manual visual inspection.

In operation, the welding platform 40 is preheated first to make the solar cell reach the preheating temperature, and then the welding platform 40 is moved below the pressing mechanism 60, and each row of the second pressure needles 62 is aligned with a flat welding belt. The third pressing pin 63 in each row is aligned with the overlapping position of the corresponding flat welding tape and the special-shaped welding tape between two adjacent solar cells. The second movement module drives the second pressure pin 62 and the third pressure pin 63 to be axially pressed down, so that the flat welding tape, the special-shaped welding tape and the solar cell are tightly pressed together. Then, the heating device 50 heats the solar cell sheet, so that the flat soldering strip and the special-shaped soldering strip are respectively fixed to both sides of the solar cell sheet to complete string welding. Finally, the second movement module drives the second pressure pin 62 and the third pressure pin 63 to rise in the axial direction to release the pressing state, and the welding platform 40 moves to the blanking position to blank the solar cells after string welding.

Those skilled in the art should understand that the foregoing description and the embodiments of the present invention shown in the accompanying drawings are merely examples, and do not limit the present invention. The functions and structural principles of the present invention have been shown and explained in the examples, and the embodiments of the present invention may have any variations and modifications without departing from the principles.

Claims (10)

A solar cell string welding system includes: Flat welding tape feeding device; Solar cell loading device; The special-shaped welding tape feeding device includes a gripper and a first movement module. The gripper includes a gripper and a first pressure needle. The gripper has a first positioning groove, and a shape of the first positioning groove. And the shape of the special-shaped welding tape is matched, so that the special-shaped welding tape is operatively restricted in the first positioning groove; the first pressure pin is located on the top of the first positioning groove and can be pressed down on the first positioning groove movably; A positioning slot, the gripper is installed on the first movement module; The welding platform includes a body having a second positioning groove and a first suction air hole, and the shape of the second positioning groove and the shape of the special-shaped welding tape are matched so that the special-shaped welding tape is operatively limited to the first welding groove. In the two positioning grooves, a bottom of the second positioning groove has a second adsorption air hole; After the special-shaped welding tape is placed in the first positioning groove of the gripper, the first pressing pin presses the special-shaped welding tape, and the first movement module drives the gripper to move and deforms the shaped welding tape. The second positioning groove is transported to the body, and the special-shaped welding tape is adsorbed to the second positioning groove through the second adsorption air hole; the solar cell sheet feeding device transports the solar cell to the place of the welding platform. The body, so that the solar cell is adsorbed on the welding platform through the first adsorption air hole and the shaped electrode strip and the interconnecting electrode on one side of the solar cell are aligned; the flat ribbon feeding device transports the flat ribbon to On the solar cell to align the flat ribbon and the interconnecting electrode on the other side of the solar cell; The heating device heats the solar cell sheet, so that the flat soldering strip and the special-shaped soldering strip are welded together with the solar cell sheet. The solar cell string welding system according to claim 1, wherein the grasping member includes a frame and a restricting portion, the restricting portion is L-shaped and integrally formed on a bottom of the frame, and the first A positioning groove is provided on the restricting portion, and the first pressure needle is mounted on the frame. The solar cell string welding system according to claim 2, wherein the number of the restricting portion and the first pressing pin are multiple, and the restricting portion corresponds to the first pressing pin one by one. Two are a group of spaced distributions, and two limiting portions of each group are respectively located on opposite sides of the frame. The solar cell string welding system according to claim 2, wherein the gripper comprises a first air cylinder, the first air cylinder is installed on the frame and connected with the first pressure needle, and the first The air cylinder pushes the first pressure needle down to the first positioning groove; the gripper further includes a plurality of suction cups and a plurality of second cylinders, and the second cylinders are installed on the frame and correspond to the suction cups one-to-one地 连接。 Ground connection. The solar cell string welding system according to claim 1, wherein the special-shaped welding tape feeding device further comprises: A first stretching and straightening mechanism includes a fixing clip and a set of movable clips, the fixing clips have a third positioning groove matching the shape of the shaped welding tape, and can operatively clamp one end of the shaped welding tape, the moving clip A fourth positioning groove matching the shape of the shaped welding tape, the movable clamp operatively clamps the other end of the shaped welding tape and moves and drags the shaped welding tape to stretch and straighten the shaped welding tape; The first cutting mechanism cuts the profiled welding tape stretched and aligned to a predetermined length, and the gripper conveys the cut profiled welding tape to the welding platform. The solar cell string welding system according to claim 1, wherein: The number of the first adsorption pores is multiple, the first adsorption pores form a plurality of rows spaced apart from the body of the welding platform, the number of the second positioning grooves is multiple, and the second positioning The grooves are arranged at intervals and in parallel, each of the second positioning grooves has a plurality of the second adsorption air holes arranged at intervals, and the second positioning grooves and the rows of the first adsorption air holes are alternately distributed in the space. The body of the welding platform. The solar cell string welding system according to claim 1, wherein the body further has a first main air passage and a second main air passage, and the first main air passage is in communication with the first adsorption air hole The second main air passage is in communication with the second adsorption air hole; the welding platform further includes a heating device and a temperature measuring device, and the heating device and the temperature measuring device are both installed on the body. The solar cell string welding platform according to claim 1, wherein the number of the welding platforms is plural, and the welding platforms are connected in series side by side. The solar cell string welding system according to claim 1, wherein the solar cell string welding system further comprises a pressing mechanism, which presses the solar cell before the heating device heats the solar cell. The flat welding tape, the special-shaped welding tape and the solar cell are pressed together, and the pressing mechanism includes: Fixtures; A plurality of second pressure pins are installed on the fixing device, and the second pressure pins can be operated to make contact with the flat welding strip to make the flat welding strip and the special-shaped welding strip pressed on both sides of the solar cell sheet respectively. Together, the end face where the second pressure pin and the flat welding strip contact is flat; A plurality of third pressure pins are installed on the fixing device, and the third pressure pins can be operated to make contact with the overlapping position of the flat welding tape and the special-shaped welding tape between two adjacent solar cells. The end contacting the overlapping position of the flat welding tape and the special-shaped welding tape is wedge-shaped; A second motion module, wherein the fixing device is installed on the second motion module, and the second motion module drives the second pressure needle and the third pressure needle to press down or rise in the axial direction. The solar cell string welding system according to claim 1, wherein the second pressing pin and the third pressing pin form a plurality of rows distributed in the fixing device, and each row includes a plurality of second pressing pins and a plurality of A third press pin is formed.

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