Solar cell, solar cell string and solar cell module

Abstract

The invention provides a solar cell, a solar cell string and a solar cell module. The invention belongs to the technical field of photovoltaic modules. The solar cell comprises a silicon wafer, and atextured surface, a doped layer and an antireflection film layer which are sequentially formed on the front surface of the silicon wafer, wherein the front surface of the solar cell is also provided with a plurality of main grid lines which are arranged in parallel and are used for collecting current, and a plurality of cut hole groups which are used for a solder strip to pass through, and the main grid lines are in one-to-one correspondence with the cut hole groups, and each cut hole group comprises two cut holes which are respectively arranged at the edges of two sides of the silicon wafer;and the main grid lines corresponding to the cut hole groups are positioned between the two cut holes in the cut hole groups. According to the solar cell, the cut holes are formed in the edge of the cell, and the center positions of the cut holes correspond to the center line positions of the cell printing main grid lines; and in the series welding process of the cell, the inter-piece welding strips connecting every two adjacent cells penetrate through the cut holes, and the distance between the cells is reduced, and the unit area power generation power of a photovoltaic module is increased.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic modules, and more specifically relates to a solar battery sheet, a battery string and a solar battery module. Background technique [0002] In order to improve the power generation efficiency of a single module and reduce the cost of the system, various module manufacturers in the photovoltaic industry have developed various technologies to increase the power generation per unit area of ​​the module. At present, the conventional interconnection technology is to use tin-coated copper strips to connect single cells into battery strings, and the battery strings are connected in series or in parallel to form components. [0003] When the ribbon is connected to the positive and negative electrodes of the battery, a certain distance needs to be designed for the bending position of the ribbon between two adjacent battery sheets, that is, the sheet spacing, to reduce the influence of the ribbon stres...

AI Technical Summary

Problems solved by technology

[0004] At present, the technology of connecting single cells into battery strings is the lamination technology. The lamination components use the scribing technology to cut the redesigned cells into small pieces with reasonable graphics. Generally, the small pieces are 1 / 5 dicing or 1 / 2 6 Scribing, and then superimposing and arranging each small piece, using conductive glue to weld the pieces to form a string, and then laminating them into components after series-parallel typesetting; the technical shortcomings of the shingling technology are as follows: (1) Lamination In the process of module design, although the same module area can be increased by about 10% of the cells, but because there is an overlap width of 1mm to 1.5mm between the sheets, the overlap width is equivalent to the loss of 2 to 3 small cells, so the shingled module (2) In order to reduce debris in the process, the shingling technology uses conductive adhesive, the conductivity of the conductive adhesive is two to three orders of magnitude lower than that of ordinary pure metal conductor materials, so the fill factor of the shingling module is higher. lower than conventional components

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