Same-side interconnected solar cell string, preparation method thereof, solar cell assembly and solar cell system

Abstract

The invention relates to a same-side interconnected solar cell string, a preparation method thereof, a solar cell assembly and a solar cell system. The same-side interconnected solar cell string comprises N-type crystalline silica solar cells and P-type crystalline silica solar cells. The N-type crystalline silica solar cells and the P-type crystalline silica solar cells are alternatively arranged. Each two adjacent N-type crystalline silica solar cell and P-type crystalline silica solar cell are interconnected through a conductive belt at the same side. The same-side interconnected solar cell string has beneficial effects of relatively high conversion efficiency and simple raw material source. The solar cell string is obtained through serial connection in a same-side interconnected manner. Stress damage of a welding belt to a cell plate can be effectively reduced; arrangement space among the cell plates can be infinitely reduced; and the conductive belt with larger thickness can be used for realizing serial connection of the cell plates, thereby improving reliability and long-term stability of the photovoltaic assembly, and prolonging service life of the photovoltaic assembly.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a same-side interconnected solar cell string, a preparation method, an assembly and a system. Background technique [0002] A solar cell is a semiconductor device that converts light energy into electrical energy. Lower production costs and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. In the past few years, industrialized battery technology has made rapid progress. At present, PERC battery technology and N-type bifacial battery technology, which represent the mainstream battery efficiency, have made major breakthroughs. Between 20.5%-21%. However, despite the great success and breakthroughs in battery technology, the corresponding module manufacturing technology still remains at the original level, that is, the same type of battery is connected in series by connecting different sides of the ribbon to form a solar battery string. T...

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Problems solved by technology

The battery string welding method used in this type of module has the following problems. 1) Due to the interconnection of different sides, the thickness of the welding ribbon is required not to be too thick. The use of thinner ribbons will lead to higher ohmic loss, which will lead to an increase in the CTM of the module; 2) Any adjacent cells are interconnected on opposite sides. If any two adjacent cells Due to the stress of the ribbon, the battery will be broken. Therefore, in the traditional module, at least 2mm of the ribbon should be left between the adjacent battery to overcome this problem, so that the power density of the module is lower than that of the battery. a certain amount of decline

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