Main-grid-free efficient back-contact solar battery and assembly and manufacturing technology thereof

Abstract

The invention relates to the field of solar batteries, in particular to a main-grid-free efficient back-contact solar battery and assembly and a manufacturing technology of the main-grid-free efficient back-contact solar battery and assembly. The main-grid-free efficient back-contact solar battery comprises a solar battery piece and an electric connection layer. The backlight surface of the solar battery piece is provided with an electrode P and an electrode N, wherein the electrode P is connected with a P-type doped layer, and the electrode N is connected with an N-type doped layer. The solar battery is characterized in that the electric connection layer comprises a plurality of conductive fine grid lines, the conductive fine grid lines are partially connected with the electrode P on the backlight surface of the solar battery piece, and the remaining conductive fine grid lines are connected with the electrode N on the backlight surface of the solar battery piece. The conductive fine grid lines are each of a multi-segment structure. The main-grid-free efficient back-contact solar battery and assembly and the manufacturing technology of the main-grid-free efficient back-contact solar battery and assembly have the advantages that the usage amount of silver paste is reduced, and the cost is lowered; as the multi-segment conductive fine grid lines are arranged, series resistance is lowered, and the transmission distance of fill factors is shortened; efficiency is improved, and meanwhile the stress on the battery piece by the conductive fine grid lines can be effectively reduced.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to high-efficiency back-contact solar cells without busbars, components and a preparation process thereof. Background technique [0002] Energy is the material basis of human activities. With the continuous development and progress of human society, the demand for energy is increasing day by day. Traditional fossil energy is non-renewable energy and it is difficult to continue to meet the needs of social development. Therefore, research and utilization of new energy and renewable sources have become increasingly popular in countries around the world in recent years. Among them, solar power generation technology has the advantages of directly converting sunlight into electricity, simple use, environmental protection and pollution-free, high energy utilization rate, etc., and has received widespread attention. Solar power generation uses large-area P-N junction diodes to generate photo-gen...

AI Technical Summary

Problems solved by technology

This process has the following defects: 1. The composite conductive backplane used is a composite conductive metal foil in the backplane, usually copper foil, and the copper foil needs to be laser etched or chemically etched

Since laser etching is still operable for simple patterns, the etching speed is slow and the production efficiency is low for complex patterns, while chemical etching requires pre-prepared complex-shaped and corrosion-resistant masks, environmental pollution and corrosive liquids on polymers. Substrate corrosion problems

Therefore, the manufacturing process of the conductive backplane manufactured in this way is complicated and the cost is extremely high.

2. It is necessary to punch the packaging material of the back layer of the solar cell so that the conductive adhesive can penetrate the packaging material. Since the packaging material is usually a viscoelastic body, it is extremely difficult to accurately punch holes

3. Accurate dispensing equipment is required to coat the conductive glue on the corresponding position of the back plate. It can also be operated for batteries with fewer back contacts such as MWT, and for back contact batteries with small and large number of back contacts such as IBC. Si

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