Cell quality determination method and device

Abstract

The embodiment of the invention discloses a quality determination method and device of a battery piece. The method comprises the steps of acquiring an efficiency quality level of the battery piece according to conversion efficiency of the battery piece; calculating a filling factor loss ratio of the battery piece according to a quality parameter of the battery piece; and finally, determining the quality level of the battery piece according to the efficiency quality level and the filling factor loss ratio of the battery piece. According to the quality determination method and device of the battery piece, provided by the embodiment, the conversion efficiency of the battery piece is determined, the battery piece matched with the conversion efficiency is divided according to the filling factorloss ratio, so that the final quality level of the battery piece is determined, photovoltaic modules prepared by employing the battery pieces having the same quality level have same filling factor loss ratio, a matching relation between the battery pieces is further ensured, the weak light response of the photovoltaic module prepared from the battery piece divided according to the quality determination method is further improved, and the power generation capability of the photovoltaic module is improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of data processing, and in particular, to a method and device for determining the quality of cells. Background technique [0002] During the operation of solar cells, short-circuit current Isc, open-circuit voltage Voc, and fill factor FF are the three electrical performance parameters that most directly affect the conversion efficiency of solar cells. Among them, the fill factor is the ratio of the maximum output power of the solar cell to the product of the short-circuit current Isc and the open-circuit voltage Voc, so the larger the fill factor, the higher the efficiency of the solar cell. [0003] When the solar cell is running, the resistance generated by the contact surface between the electrode and the silicon wafer, the resistance generated by the substrate inside the battery, and the sheet resistance of the diffusion area are connected in series with the load on the same ci...

AI Technical Summary

Problems solved by technology

[0004] At present, in the solar cell manufacturing process, the open circuit voltage Voc is usually relatively stable, and the series resistance R s And the parallel resistance Rsh often fluctuates greatly with the process, which will have a greater impact on the fill factor FF, and then affect the conversion efficiency of solar cells

However, in the existing I-V curve test, the series resistance Rs and the parallel resistance Rsh are calculated by fitting, and the two influence each other, so it is impossible to accurately determine the main factors that cause the loss of the fill factor FF

For cells classified according to conversion efficiency, cells of different fill factor FF failure types will be mixed together. When these cells are connected in series to form a photovoltaic module, it will cause a mismatch between the cells, resulting in a decrease in the weak light response of the photovoltaic module. , affecting the weak light response of photovoltaic modules and affecting the power generation capacity of photovoltaic modules

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