CN210467856U

CN210467856U - Solar cell for non-shielding component packaging technology

Info

Publication number: CN210467856U
Application number: CN201920789879.0U
Authority: CN
Inventors: 郭万武; 陈�光; 康海涛
Original assignee: Jetion Solar Jiangsu Co Ltd
Current assignee: Jetion Solar Jiangsu Co Ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-05-05
Anticipated expiration: 2029-05-29

Abstract

The utility model discloses a solar wafer for having no subassembly packaging technology that shelters from, this solar wafer include positive main grid structure and positive vice bars structure, and positive main grid structure and positive vice bars structure are located solar wafer's front surface. The back surface of the solar cell is provided with a back electrode structure, the front main grid structure and the back electrode structure are vertically distributed, and the number of the back electrode structures is different from that of the front main grid structures. The back electrode of each independent battery unit is perpendicular to the front main grid electrode, and the front electrode can be connected with the back electrode of another independent battery unit only by a short interconnection strip welding strip, so that the use of the interconnection strip is greatly saved, the series resistance loss of the solar battery assembly is effectively reduced, and the shading area of the interconnection strip welding strip is also reduced.

Description

Solar cell for non-shielding component packaging technology

Technical Field

The utility model relates to a solar wafer for having no subassembly packaging technology that shelters from can be used to technical field.

Background

At present, the front electrode patterns of the solar cell are different, and as shown in fig. 1 and fig. 2, a main and auxiliary grid structure is basically adopted, and a main and auxiliary grid line is parallel to the solar cell at the edge of the solar cell; the main grids 1 are generally symmetrically distributed, the auxiliary grids 2 are perpendicular to the main grids, and the back electrodes 3 are designed in parallel to the main grids; its design principle generally follows two aspects: on one hand, the current collection efficiency is expected to be increased, and the photoelectric conversion efficiency of the solar cell is further improved; on the other hand, the shading of the main grid line and the auxiliary grid line on the light inlet surface of the solar cell is desirably reduced as much as possible.

In order to improve the conversion efficiency of the solar cell, the current practice is to increase the number of grid lines. The increase of the number of the grid lines can effectively reduce the series resistance of the solar cell, thereby achieving the purposes of increasing the collection rate of the photo-generated current and improving the photoelectric conversion efficiency. When the assembly is manufactured, the main grid is covered with a welding strip so as to be connected with other batteries. The traditional photovoltaic module interconnection technology adopts a welding strip to weld the battery unit, the welding strip penetrates through the whole battery piece, a large amount of expensive welding strip needs to be consumed, about 3% of incident light is shielded by the welding strip and cannot be effectively absorbed by the battery piece, the manufacturing cost is greatly increased and decreased, and the conversion efficiency of the module is remarkably reduced. The effective light receiving area of the solar cell on the module influences the output power of the module, and the effective light receiving area of the effective cell is increased to improve the power of the module; meanwhile, the consumption of welding strips is reduced, the power consumption cost can be greatly reduced, and the aim of flat-price on-line power generation is achieved as early as possible.

In order to solve the problem, a reflective film material is usually superposed on a welding strip at present to compensate the shielding loss, however, the requirement of the film pasting technology is high, the poor film is easily generated, the packaging cost of the assembly is increased, if the battery can avoid the shielding of the welding strip on the graphic design to realize the interconnection of the battery pieces in the assembly, and the consumption of the welding strip is reduced in the interconnection process of the assembly, the conversion power of the assembly is greatly improved, and the production cost is reduced.

Disclosure of Invention

The utility model aims at solving the above problem existing in the prior art, providing a solar cell piece for there is not subassembly packaging technology that shelters from.

The purpose of the utility model can be realized through the following technical scheme: the utility model provides a solar wafer for having shelter from subassembly packaging technology, includes positive main grid structure and positive vice grid structure, and positive main grid structure and positive vice grid structure are located the front surface of solar wafer, are equipped with back electrode structure on the back surface of solar wafer, positive main grid structure sets up for vertical distribution with back electrode structure, and the quantity of back electrode structure is different with positive main grid structure quantity.

Preferably, the front main gate structure is an asymmetric structure.

Preferably, the front main grid structure adopts a cross-linking mode.

Preferably, the solar cell is divided into N cell units with equal area along the Y-axis direction, and the value of N is 2, 3, 4, 5 or 6.

Preferably, each of the individual battery cells is interconnected by a welding strip of interconnection bars, the back electrode of each of the individual battery cells is perpendicular to the front main grid, and the front main grid is connected with the back electrode of another individual battery cell by the welding strip of interconnection bars.

The utility model adopts the above technical scheme to compare with prior art, have following technological effect: according to the solar cell module, each independent cell unit is interconnected, and the back electrode of each independent cell unit is perpendicular to the front main grid electrode, so that the front electrode can be connected with the back electrode of another independent cell unit only by a short interconnection strip welding strip, and the use of the interconnection welding strip is greatly saved; the solar cell module has the advantages that series resistance loss of the solar cell module is effectively reduced, the shading area of the interconnection strip solder strip is reduced, photo-generated current is increased, the output power of the module is increased, and the manufacturing cost is reduced.

Drawings

Fig. 1 is a schematic front structural diagram of a solar cell of the prior art.

Fig. 2 is a schematic front structural diagram of a solar cell of the prior art.

Fig. 3 is a schematic structural diagram of a solar cell of the present invention.

Fig. 4 is a schematic structural diagram of a solar cell of the present invention.

Fig. 5 is a schematic structural diagram of a solar cell of the present invention.

Detailed Description

Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are merely exemplary embodiments for applying the technical solutions of the present invention, and all technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the scope of the present invention.

The utility model discloses a solar wafer for having shelter from subassembly packaging technology, as shown in FIG. 3, FIG. 4 and FIG. 5, this solar wafer includes positive main grid structure 10 and positive vice grid structure 20, and positive main grid structure 10 and positive vice grid structure 20 are located the front surface of solar wafer. The back surface of the solar cell is provided with a back electrode structure 30, the front main grid structures 10 and the back electrode structure 30 are vertically distributed, and the number of the back electrode structures is different from the number of the front main grid structures.

As shown in fig. 3, the front main gate structure 10 is an asymmetric structure. The asymmetric structure is that relative to the central line of the solar cell, the front main grid of the solar cell used for the non-shielding component packaging technology is designed to be an asymmetric structure, and is different from the symmetric structure design of the traditional solar cell main grid. Specifically, in the technical scheme, the number of the front main grid structures on the left side of the central line of the solar cell is three, the number of the front main grid structures on the right side is two, and the distances between the front main grid structures are equal.

The front main grid structure 10 is in a cross-linking manner. The transverse connection mode refers to that a special connecting point on the front main grid structure is connected with a welding strip in a transverse mode in the X-axis direction, and is different from the traditional longitudinal connection process. Six connecting points used for being connected with the welding strip are arranged on each front main grid structure in a clearance mode, five pieces are cut in the longitudinal Y-axis direction, welding points are perpendicular to the welding strip by 90 degrees, and the welding points are connected in a transverse connection mode, so that the shading area of the welding strip can be reduced, and the use amount of the welding strip and the power consumption of series resistors of components can be reduced.

The solar cell is divided into N cell units with equal area, and the value of N is 2, 3, 4, 5 or 6. Each individual cell is interconnected by an interconnecting strip solder strip 40, the back electrode of each individual cell is perpendicular to the front side main grid, and the front side main grid is connected to the back electrode of another individual cell by an interconnecting strip solder strip.

The main grid line of the solar cell provided by the invention is designed to be an asymmetric structure; the back electrodes are perpendicular to the front main grid lines, and the number of the back electrodes is not equal to that of the front main grid lines, namely, the solar cell provided by the invention has an appearance structure different from that of the traditional solar cell; therefore, when the solar cell sheet provided by the invention is used for forming a solar module, new possibilities are provided for the circuit design and the appearance structure of the solar cell module.

The invention provides a solar cell graph design scheme suitable for the technology of non-shielding component interconnection, and the difference between the solar cell graph design scheme and the traditional design is as follows: one is as follows: the positive electrode and the back electrode are vertically distributed; the second step is as follows: the front electrode is designed in an asymmetric structure; and thirdly: the number of the designed positive electrodes and the back electrodes is not equal; fourthly, the method comprises the following steps: the positive electrode adopts a transverse connection mode, so that the consumption of the interconnection bars and the power consumption of the series resistance of the component can be greatly reduced.

The utility model has a plurality of implementation modes, and all technical schemes formed by adopting equivalent transformation or equivalent transformation all fall within the protection scope of the utility model.

Claims

1. A solar cell for the non-shielding component packaging technology is characterized in that: the solar cell comprises a front main grid structure (10) and a front auxiliary grid structure (20), wherein the front main grid structure (10) and the front auxiliary grid structure (20) are located on the front surface of a solar cell, a back electrode structure (30) is arranged on the back surface of the solar cell, the front main grid structure (10) and the back electrode structure (30) are vertically distributed, and the number of the back electrode structures is different from the number of the front main grid structures.

2. The solar cell for the shielding-free component packaging technology according to claim 1, wherein: the front main grid structure (10) is of an asymmetric structure.

3. The solar cell for the shielding-free component packaging technology according to claim 1, wherein: the front main grid structure (10) adopts a transverse connection mode.

4. The solar cell for the shielding-free component packaging technology according to claim 1, wherein: the solar cell is divided into N cell units with equal area along the Y-axis direction, and the value of N is 2, 3, 4, 5 or 6.

5. The solar cell for the shielding-free component packaging technology according to claim 4, wherein: each independent battery unit is interconnected through an interconnection strip solder strip (40), the back electrode of each independent battery unit is perpendicular to the front main grid, and the front main grid is connected with the back electrode of another independent battery unit through the interconnection strip solder strip.