Solar cell plate, solar cell string and solar cell assembly

Abstract

The invention relates to a solar cell plate. A thin grid line and a main grid line are disposed on the front surface of the solar cell plate at the same time, and the current generated by the solar cell plate is converged to the main grid line with small sun shading area from the thin grid line and then are transmitted to back electrode or back electric field on the back surface of another adjacent solar cell plate from the main grid line. The main grid line has small sun shading area, so higher current can be generated; each thin grid line is connected with at least one main grid line, and the current generated by the cell plate can be transmitted to the main grid line from the shortest thin grid line, so that low electric loss on the electrode is realized and electric energy using ratio of the cell plate is improved. The arrangement of conductive hole on the solar cell plate is avoided, working procedure of processing the conductive hole is reduced, filling of expensive conductive paste and complicated electrode wire connection on the back surface of the cell plate are not needed, and photoelectric conversion efficiency equivalent to that of high-efficiency solar cell is kept while manufacturing cost is reduced. The invention also provides a solar cell string and a solar cell assembly using the solar cell plate.

Description

technical field [0001] The invention belongs to the field of photovoltaic or semiconductor, and in particular relates to a solar battery sheet, a solar battery string and a solar battery module using the solar battery sheet. Background technique [0002] Such as figure 1 As shown, the existing solar cells (such as high-efficiency MWT (Metal Wrap Through) cells) include a silicon wafer 91, a diffusion layer 92 and an anti-reflection film 93 stacked in sequence. Each thin grid line 94 is arranged parallel to each other on the thin grid lines 94 for conducting current. At least one positive electrode 95 and at least one negative electrode 96 are provided on the lower surface of the silicon chip 91, and an insulating groove is passed between the positive electrode 95 and the negative electrode 96. 97 isolation, on the silicon wafer 91, the diffusion layer 92 and the anti-reflection film 93, there is at least one through conductive hole 98, the conductive hole 98 is filled with ...

AI Technical Summary

Problems solved by technology

[0004] However, this solar cell also has the following disadvantages: because there are many fine grid lines 94 on the front of the cell, it is necessary to process a lot of conductive holes 98 on the cell to connect to the negative electrode 96 on the back of the cell, resulting in complicated procedures and high manufacturing costs.

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