Main-grid-free high-efficiency back contact solar battery module, assembly and preparing process

Abstract

The invention relates to the field of solar batteries, in particular to a main-grid-free high-efficiency back contact solar battery module, an assembly and a preparing process. The solar battery module comprises a battery piece and an electric connecting layer, wherein the back light side of the battery piece is provided with an electrode P connected with a P type doping layer and an electrode N connected with an N type doping layer. The solar battery module is characterized in that the electric connecting layer comprises a penetrating hole and a conducting wire, the conducting wire is respectively arranged at the front side and the back side of the electric connecting layer, the front side conducting wire is electrically connected with any one electrode, the back side conducting wire is electrically connected with the other electrode through conducting media in the through hole, and the electric connecting layer is made of insulation materials. The solar battery module, the assembly and the preparing process have the beneficial effect that the low-cost hidden-crack-resistant high-efficiency and high-stability solar battery assembly capable of preventing emitting electrode P and emitting electrode N short circuit is provided.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a busbar-free, high-efficiency back-contact solar cell module, assembly 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-...

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. Simply not possible with dispensing equipment

[0011] Moreover, in the prior art, the wires connected to the P emitter and the N emitter will form a cross or be close to each other, and the solar cell will easily form a short circuit after a period of aging and external force contact, which will seriously affect the overall performance of the battery module.

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