Cutting technology for back contact solar battery

Abstract

The invention relates preparation of concentrated solar batteries, and provides a cutting technology for a back contact solar battery. The cutting technology comprises the following steps: firstly fixing the back contact solar battery on a machine table, wherein the back of the back contact solar battery faces upward; then cutting the back contact solar battery into battery wafers by virtue of a cutting device, wherein during transverse cutting, all or parts of corresponding electrodes are cut, the sum of the positive electrodes and negative electrodes of the battery wafers formed after cutting is an odd number, and the two electrodes at the outermost side of each battery wafer are both positive electrodes or both negative electrodes; and finally transferring the battery wafers formed after cutting to on a wafer tray. According to the cutting technology, tool setting by virtue of the electrodes is realized, therefore, the tool setting is convenient and is high in precision; the two electrodes at the outermost side of each battery wafer have same polarity, thus the identification operation is not needed; the limitation on the size of the battery wafers, the number of the positive and negative electrodes, and the source of raw materials, is eliminated; the SMT (surface mount technology) braiding is high in assembly efficiency; and partial raw materials are wasted, but the overall yield can be effectively improved, and the overall cost control is superior to that in the existing technology.

Description

technical field [0001] The invention relates to the preparation of concentrating solar cell components, in particular to a cutting process for back contact solar cells. Background technique [0002] Concentrated solar energy is also called concentrated photovoltaics, which is called Concentrated Photo Voltaics in English, or CPV for short. It gathers a certain area of ​​light in a small area through a concentrating lens, that is, forms a focal spot. The size of a solar cell unit only needs to be The size of the focal spot area; under the same conditions, the higher the magnification of the condenser lens, the smaller the required solar cell area, thus greatly reducing the amount of solar cells used, which can effectively reduce the cost of photovoltaic power generation. [0003] At present, a complete concentrating photovoltaic power generation system mainly includes several parts such as concentrating solar cell components, trackers, electric energy storage or inverter equi...

AI Technical Summary

Problems solved by technology

[0012] However, strip-shaped battery wafers cannot avoid the operation of identifying the electrode polarity, but can only reduce the identification operation, and the larger the aspect ratio and the thinner the thickness, the easier it is to break; correspondingly, each electrode on the circuit board needs to be equipped with more a pad to overcome the partial failure caused by cracking, but it is not conducive to SMT chip packaging; the strip battery chip has a large aspect ratio and is easy to slide before the SMT process is soldered. It needs to be temporarily fixed by gluing first. It is not conducive to SMT chip packaging; it cannot overcome the problem of poor tool setting accuracy

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