Low-resistance serial welding structure for solar cell component

Abstract

The invention discloses a low-resistance serial welding structure for a solar cell component. The welding structure comprises a first cell and a second cell adjacent to each other, wherein the length of one ends, extending out of a corresponding side of a cell silicon wafer, of the negative and positive electrodes of the cells is 6 / 10a-9 / 10a; the other ends of the negative and positive electrodes of the cells is recessed in the cell silicon wafer for 0.5-3mm; and the negative electrode of the first cell is overlapped and integrally welded with the positive electrode of the second cell. Because an electrode connecting structure between cells is changed, shrinkage at the connecting part of the two cells is the thickness of the cell silicon wafer only, the shrinkage at the connecting part of the two cells is reduced, the pressure of a metal solder strip silicon wafer is greatly reduced, and the cell silicon wafer can be effectively prevented from being crushed; and meanwhile, the resistance at the connecting part is reduced by half, the power output of the cell component is improved, and the defect of short circuit of the cell component caused by softening of the heated metal solder strip is overcome. The distance between the cells can be reduced by 20-30%, the effective day-lighting area of the solar cell component is improved, and the structure is beneficial to the improvement on the output power.

Description

Technical field: [0001] The invention relates to a connection mode of battery slices during the production of solar battery modules, in particular to a series welding structure between battery pieces in the solar battery module. Background technique: [0002] The output voltage, current, and power of a single solar cell are very small. Generally speaking, the output voltage is only about 0.5V, and the output power is only 1-4W, which cannot meet the requirements for power supply applications. In order to increase the output power, multiple single cells need to be reasonably connected and packaged into components. When more power is required, it is necessary to connect multiple components into a square array to provide a larger current and voltage output to the load. [0003] Due to the particularity of the solar cell absorbing light and generating current, it is required to have a large area. Its shape is thin, the lighting surface is the negative electrode, and the backlig...

AI Technical Summary

Problems solved by technology

[0004] At present, the metal ribbon connection structure between two adjacent cells in solar cell modules is as follows: figure 1 As shown, each cell consists of a negative electrode 1, a cell silicon chip 2 and a positive electrode 3. The electrode connection relationship between two adjacent cells is: the negative electrode 1 on the first cell and the second cell The positive electrode 3 on the chip is the same metal ribbon. There are two defects in this single metal ribbon connection structure. First, the edge pressure of the metal ribbon on the battery sheet increases during lamination, which increases the strength of the battery sheet. breakage rate

Second, when the battery module is working, the metal ribbon will sag after being heated, so that the metal ribbon contacts the end face of the battery sheet to form a short circuit, which directly affects the normal output of the entire battery module

Third, according to the resistance formula R=ρI / S, the greater the thickness of the metal ribbon and the larger the cross-sectional area (S), the smaller the resistance (R), and the existing single metal ribbon connection method makes the cell The connection resistance is too large, which is not conducive to the output of solar cell module power

Fourth, when the cells are laminated and packaged, at the junction of two cells, under the action of vacuum compression, the amount of shrinkage here is the sum of the thickness of the cell silicon chip and the thickness of a metal ribbon. Such a large compression The amount of deformation increases the pressure on the battery silicon in the battery, and it is easy to crush the battery silicon

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