CN106735992A - The welding method of photovoltaic cell component - Google Patents

Abstract

The invention discloses a kind of welding method of photovoltaic cell component.The present invention is mutually associated by being set between the first extension that will be oppositely arranged in adjacent solder unit and the second extension, solar battery sheet in photovoltaic cell component is realized to interlock the welding manner of overlap joint, compared to traditional tandem welding procedure that battery strings are formed by monolithic battery piece Series connection welding, the technological process of production can be simplified, improve production efficiency, this external enwergy improves the output voltage and output current of photovoltaic cell component simultaneously, and then improve power output, it is rationally distributed in the photovoltaic cell sub-component compact conformation of imbricate in structure type.

Description

Welding method of photovoltaic cell module

technical field

The invention relates to the technical field of solar cells, in particular to a welding method for photovoltaic cell components.

Background technique

The production process of monocrystalline silicon and polycrystalline silicon solar cells involves the string welding process of solar cells. The existing automatic solar cell welding machine adopts the back-connected welding method of adjacent cells to complete the string welding process of a single string of cells step by step. , that is, the cell adsorption and handling device first places the 156mm×156mm cell on the transmission line of the serially welded cell string, and then the ribbon clamping part extracts a plurality of interconnected ribbons whose length is about twice the side length of the cell from the wire-releasing mechanism and puts them together. It is cut by the ribbon cutting module, and then the ribbon clamping part will directly place the cut multiple ribbons on the busbar on the front of the previous cell and align them, and then the battery string transmission line carries the battery and the solder. The belt advances with a step distance of 158mm, and finally the cell adsorption and handling parts place the subsequent cells on the top of the ribbon with a distance of 2mm between the front and rear cells. up, thus completing a cycle. A single string of series-connected battery strings can be formed by repeating this cycle.

The above-mentioned back-connected series welding method can only complete the series welding process of a single battery string, and the output voltage of a single battery string has been increased. In order to further increase the output voltage, the conventional method is to arrange multiple battery strings side by side in an odd-even staggered manner. Arrangement, that is, the direction of the odd-numbered battery strings remains unchanged in the horizontal plane, and the even-numbered battery strings need to be placed after being rotated 180° horizontally. One end of the last two rows of battery strings leads to positive and negative electrodes respectively. This kind of photovoltaic cell module composed of multiple battery strings in series adopts a series connection method as a whole, which greatly improves the output voltage of the module, but the output current does not increase, and the improvement of the output power of the photovoltaic cell module is limited. The production process is complex, involving a series of decomposition actions such as string welding of single battery strings, horizontal rotation of battery strings by 180°, laying of battery strings, and string welding of busbars, and the production efficiency is relatively low.

The above content is only used to assist in understanding the technical solution of the present invention, and does not mean that the above content is admitted as prior art.

Contents of the invention

The main purpose of the present invention is to provide a photovoltaic cell assembly and its welding method, aiming to solve the technical problems of complex production process and low production efficiency of the photovoltaic cell assembly.

In order to achieve the above object, the present invention provides a method for welding a photovoltaic cell assembly, the method comprising the following steps:

Take m×n solar cells as a welding unit, and set each solar cell in each welding unit on the same plane and on the same straight line in the longitudinal direction, and the upper surface of one side of the length direction of each solar cell is A first extension is provided, and a second extension is provided on the lower surface of the other side in the length direction of each solar battery sheet, wherein the n and m are both integers greater than or equal to 2;

The welding units are arranged in parallel, and the first extension part of each solar cell sheet is opposite to the second extension part of the adjacent solar cell sheet;

Welding the first extension and the second extension opposite to each other in the adjacent welding unit through interconnection strip welding;

Welding each solar battery piece in the welding unit arranged at the head end to the first busbar, and welding each solar battery piece in the welding unit arranged at the end to the second busbar.

Preferably, the widths of the first extension, the second extension and the interconnection strips are the same.

Preferably, the adjacent solar cells in the welding unit are arranged at a preset distance.

Preferably, the interconnection belt has a length of mL+c(m-1), wherein, L is the length of each solar cell, and c is the preset interval.

In the present invention, interconnection strips are arranged between the first extension part and the second extension part oppositely arranged in adjacent welding units, so as to realize the welding method of staggered overlapping of solar cell sheets in the photovoltaic cell module, compared with the traditional single-chip The series welding process of battery cells welded in series to form battery strings can simplify the production process and improve production efficiency. In addition, it can simultaneously increase the output voltage and output current of photovoltaic cell modules, thereby increasing the output power. The structure is shingled. The photovoltaic cell sub-assembly has a compact structure and a reasonable layout.

Description of drawings

Fig. 1 is a schematic structural view of a welding unit in a photovoltaic cell assembly according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a photovoltaic cell assembly according to an embodiment of the present invention;

Fig. 3 is a partially enlarged view of the junction of adjacent solar cells in a photovoltaic cell module according to an embodiment of the present invention;

Fig. 4 is a partially enlarged view of the connection between the solar cells and the first busbar in the welding unit provided at the head end of the photovoltaic cell module according to an embodiment of the present invention;

Fig. 5 is a partial enlarged view of the connection between the solar cells and the second busbar in the welding unit arranged at the end of the photovoltaic cell module according to an embodiment of the present invention;

Fig. 6 is a schematic circuit diagram of a photovoltaic cell assembly according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart of a welding method for a photovoltaic cell module according to an embodiment of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Fig. 1 is a schematic structural view of a welding unit in a photovoltaic cell assembly according to an embodiment of the present invention; Fig. 2 is a schematic structural view of a photovoltaic cell assembly according to an embodiment of the present invention; Fig. 3 is a schematic view of a photovoltaic cell assembly according to an embodiment of the present invention A partial enlarged view of the junction of adjacent solar cell sheets; referring to FIGS. Value greater than or equal to 2, such as: 2, 3, 4 or 6 etc.), each welding unit includes 3 solar cells 1 (that is, m=3, but m in this embodiment can also be other values greater than or equal to 2 value, such as: 2, 4, 5 or 6 etc.), and each solar battery sheet 1 in the welding unit is located on the same plane and the length direction is in the same straight line;

The upper surface of one side of the longitudinal direction of each solar battery sheet 1 is provided with a first extension part 1-2, and the lower surface of the other side of the longitudinal direction of each solar battery sheet 1 is provided with a second extension part 1-1. The first extension part 1-2 of the sheet is opposite to the second extension part 1-1 of the adjacent solar cell sheet, and the first extension part 1-2 and the second extension part 1-1 of the adjacent welding unit are oppositely arranged. Interconnection belt 2 is arranged between.

In this embodiment, interconnection strips are arranged between the first extension part and the second extension part oppositely arranged in adjacent welding units, so as to realize the welding method of staggered overlapping of solar cells in the photovoltaic cell module. The series welding process of the battery strings formed by welding the cells in series can simplify the production process and improve production efficiency. In addition, the output voltage and output current of the photovoltaic cell module can be increased at the same time, thereby increasing the output power. The structure is shingled. Shaped photovoltaic cell sub-assemblies are compact in structure and reasonable in layout.

In order to facilitate the extraction of the positive and negative poles of the photovoltaic cell assembly, referring to Figures 4 to 5, in this embodiment, each solar battery sheet in the welding unit 3 provided at the head end can be connected to the first bus strip 5-2, and the The first busbar 5-2 is used as the positive electrode of the photovoltaic cell module. Of course, the first busbar 5-2 is usually connected with the first extension part 1 of each solar battery piece in the welding unit 3 provided at the head end. -2 connections;

Each solar battery sheet in the welding unit 4 provided at the end is connected to the second busbar 5-1, and the second busbar 5-1 is used as the negative electrode of the photovoltaic cell module. Of course, the second busbar 5 -1 is usually connected to the second extension 1-1 of each solar battery sheet in the welding unit 4 provided at the end.

Considering the ease of installation and the firmness of the photovoltaic cell assembly, in this embodiment, the widths of the first extension part 1 - 2 , the second extension part 1 - 1 and the interconnection strip 2 are the same.

In a specific implementation, in order to prevent the length of the interconnection belt 2 from being too long and increase the cost, therefore, in this embodiment, the adjacent solar cells in the welding unit are set at a preset distance, and correspondingly, the The length of the interconnection ribbon is mL+c(m-1), wherein, L is the length of each solar cell, and c is the preset interval.

The present invention is described below with a specific example, but the protection scope of the present invention is not limited. In this example, three solar cells 1 with a format of 156 mm × 31.2 mm are arranged in a linear array with a pitch of 3 mm along the lateral direction, together forming a cell group and serving as a welding unit, and the spatial structure is parallel to each other and discrete solar cells There is no inherent relationship between them, but when the interconnection belt 2 with a format of 474mm×1.2mm transitions between two adjacent welding units, the previous welding unit, the intermediate interconnection belt and the subsequent welding unit are sequentially arranged from bottom to top. For secondary stacking, the width of the overlapping of the three is the width of the interconnection belt, which is 1.2mm. Referring to Figure 6, due to the conduction, shunting and current collection of the interconnection belt 2, the solar cells in each welding unit are connected in parallel, which is equivalent to the parallel connection of the voltage sources of the three branches, and the local parallel welding units are used as equal Effective voltage sources are connected in series with each other, and so on, any adjacent welding units are gradually staggered and overlapped through interconnection strips to form shingled photovoltaic cell modules, that is, a series of welding units are locally connected in parallel through three solar cells. , and then the group is connected in series in parallel to form a grid-shaped photovoltaic cell module. The first extension part 1-2 of each solar battery sheet in the welding unit 3 provided at the head end and the second extension part 1-1 of each solar battery sheet in the welding unit 4 provided at the end are each welded with a 474mm×6mm Convergence strips respectively lead out the positive and negative poles of the photovoltaic cell module.

Fig. 7 is a schematic flow chart of a welding method of a photovoltaic cell module according to an embodiment of the present invention; referring to Fig. 7, the method includes the following steps:

S10: Take m×n solar cells as a welding unit, and arrange the solar cells in each welding unit on the same plane and on the same straight line in the length direction, and one side of the length direction of each solar cell A first extension is provided on the upper surface, and a second extension is provided on the lower surface on the other side of the length direction of each solar cell, wherein the n and m are both integers greater than or equal to 2;

S20: Arranging each welding unit in parallel, and arranging the first extension part of each solar battery sheet and the second extension part of the adjacent solar battery sheet opposite to each other;

S30: Welding the first extension part and the second extension part opposite to each other in the adjacent welding units through interconnection ribbon welding.

In order to facilitate the extraction of the positive and negative electrodes of the photovoltaic cell assembly, in this embodiment, the method may further include:

S40: welding each solar battery piece in the welding unit arranged at the head end to the first busbar, and welding each solar battery piece in the welding unit arranged at the end to the second busbar.

Considering the ease of installation and the firmness of the photovoltaic cell assembly, in this embodiment, the widths of the first extension part, the second extension part and the interconnection strips are the same.

In a specific implementation, in order to prevent the length of the interconnection belt from being too long and increase the cost, therefore, in this embodiment, the adjacent solar cells in the welding unit are set at a preset distance, and accordingly, the interconnection The length of the strip is mL+c(m-1), wherein, L is the length of each solar cell, and c is the preset interval.

The present invention is described below with a specific example, but the protection scope of the present invention is not limited. In this example, the string welding battery string transmission line carries the battery string forward periodically and intermittently at a step distance of 30mm. The station sequentially stacks the welding strips and the welding units that are evenly spaced side by side along the transverse direction on the edge of the adjacent welding unit in front, and the adjacent welding units are overlapped by the transition of the welding strip placed in between, and the edge of the welding unit The area of the local up and down staggered overlapping area is the surface area of the welding strip. In such a cycle, the adjacent welding units and the transitional welding strips are gradually overlapped to form a continuous battery string in the form of shingled tiles. The battery sheets in each row of battery sheet groups are connected in parallel, and the adjacent welding units are connected in series. The welding units are partially connected in parallel and then connected in series as a whole to form a grid-shaped photovoltaic cell module. The welding units at the first and last ends of the photovoltaic cell module lead out the positive and negative electrodes through the bus belt respectively.

It should be noted that, as used herein, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or system comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or system. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or system comprising that element.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (4)

1. A welding method for a photovoltaic cell assembly, characterized in that the method comprises the following steps: m×n solar cells are used as a welding unit, and each solar cell in each welding unit is arranged on the same plane and the length direction is on the same straight line, and the upper surface of one side of the length direction of each solar cell is A first extension part is provided, and a second extension part is provided on the lower surface of the other side in the length direction of each solar battery sheet, wherein the n and m are both integers greater than or equal to 2; The welding units are arranged in parallel, and the first extension part of each solar cell sheet is opposite to the second extension part of the adjacent solar cell sheet; Welding the first extension and the second extension opposite to each other in the adjacent welding unit through interconnection strip welding; Welding each solar battery piece in the welding unit arranged at the head end to the first busbar, and welding each solar battery piece in the welding unit arranged at the end to the second busbar. 2. The method of claim 1, wherein the widths of the first extension, the second extension and the interconnection strips are the same. 3. The method according to any one of claims 1-2, characterized in that, the adjacent solar cells in the welding unit are arranged at a preset distance. 4. The method according to claim 3, characterized in that, the length of the interconnection belt is mL+c(m-1), wherein, L is the length of each solar cell, and c is the preset interval.