Low-warping-degree solar energy aluminum paste

Abstract

The invention relates to low-warping-degree solar energy aluminum paste. The low-warping-degree solar energy aluminum paste comprises, by mass, 73%-78% of spherical aluminum powder, 1%-2% of glass powder, 22%-25% of organic binder, and 0.1%-0.3% of crystallized state high-thermal-conductivity inorganic powder. The low-warping-degree solar energy aluminum paste greatly improves processing properties of aluminum paste in the process of sintering by adding proper amount of high-thermal-conductivity inertia inorganic filler to solar energy aluminum powder, and overcomes the defect of usage of fumed silica in a traditional method. The high-thermal-conductivity inertia inorganic filler can enable aluminum layers to be evenly heated, prevents aluminum thorns and alumina beads from being produced, and meanwhile greatly reduces warping degrees of solar energy battery pieces. Due to the fact that additive amount of the crystallized state high-thermal-conductivity inorganic powder is small, electric properties of the solar energy battery pieces can be well maintained.

Description

technical field [0001] The invention relates to a solar aluminum paste, in particular to a low warpage solar aluminum paste. Background technique [0002] Solar back field aluminum paste, in the sintering process of the cell, the aluminum powder melts and forms a silicon-aluminum alloy layer with silicon, because the molten aluminum layer will have a large shrinkage after cooling, which causes the cell to bend, in order to reduce The warpage of the battery sheet, the traditional method is to add inorganic powder fillers to the aluminum paste, which can significantly reduce the warpage of the battery sheet, but because the amount of added inorganic filler is large, the series resistance of the battery sheet increases and decreases. The electrical performance of the battery sheet is affected, and the process performance of sintering is also reduced. [0003] The traditional method is to add a slurry of fumed silica, because the thermal conductivity of silica is poor, resultin...

AI Technical Summary

Problems solved by technology

[0002] Solar back field aluminum paste, in the sintering process of the cell, the aluminum powder melts and forms a silicon-aluminum alloy layer with silicon, because the molten aluminum layer will have a large shrinkage after cooling, which causes the cell to bend, in order to reduce The warpage of the battery sheet, the traditional method is to add inorganic powder fillers to the aluminum paste, which can significantly reduce the warpage of the battery sheet, but because the amount of added inorganic filler is large, the series resistance of the battery sheet increases and decreases. The electrical performance of the battery sheet is reduced, and the sintering process performance is also reduced.

[0003] The traditional method is to add a slurry of fumed silica, because the thermal conductivity of silica is poor, resulting in uneven heating of the aluminum layer, which is prone to produce aluminum thorns, aluminum beads and aluminum buds, and fumed silica is amorphous Compared with the crystalline inorganic filler, it is necessary to add more amount to reduce the warpage of the battery sheet, which will lead to a decrease in the electrical performance of the battery sheet.