Solar Cells, Solar Strings and Solar Modules

Abstract

The invention relates to a solar cell slice. Current generated by the solar cell slice is converged to a node by fine grid lines and then is conveyed by the node onto a back electrode or a back electric field on the back surface of another adjacent cell slice through a convergence belt. The invention has the beneficial effects that a conductive hole is prevented from being arranged on the cell; expensive conductive paste is not required to be filled; no complicated electrode connection is required on the back surface of the cell slice; and while the manufacturing cost is reduced, the photoelectric conversion efficiency equivalent to that of a highly-efficient solar cell is kept. All the fine grid lines are arranged crosswise and are converged into at least one node; and the current generated by the cell slice can be conveyed from the fine grid line with the shortest length to the node, so that the resistance is minimum when the current is conveyed on the fine grid line, thereby reducing the electric energy loss and improving the electric energy utilization rate of the cell slice. The node of the solar cell slice has small volume, so that the light shielding area on the front surface of the cell slice is reduced, and the effective illumination surface on the front surface of the cell slice is increased, thereby improving the power generating capacity of the cell slice within the unit area. The invention also provides a cell string and a cell module using the solar cell slice.

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 include a silicon wafer 91, a diffusion layer 92, and an anti-reflection film 93 stacked in sequence. Several thin grid lines 94 for conducting current are arranged on the upper surface of the anti-reflection film 93. The grid lines 94 are arranged parallel to each other, and 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 the positive electrode 95 and the negative electrode 96 are separated by an insulating groove 97. The anti-reflection film 93 is provided with at least one through conductive hole 98 , and the conductive hole 98 is filled with a conductive paste 99 , and each fine gri...

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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