Battery string in N-type IBC (Interdigitated Back Contact) solar cell spliced connection, preparation method of battery string, assembly and system

Abstract

The invention relates to a battery string in N-type IBC solar cell spliced connection, a preparation method of the battery string, an assembly and a system. The battery string comprises strip-shaped N-type IBC solar cells and conductive parts used for Ohm connection among the strip-shaped N-type IBC solar cells, wherein the back surfaces of the strip-shaped N-type IBC solar cells comprise emitter p+ regions and base n+ regions which are alternately arranged with one another; p+ emitter contact electrodes are arranged in the emitter p+ regions; n+ base contact electrodes are arranged in the base n+ regions; the battery string further comprises p+ electrode conjunction points arranged on the p+ emitter contact electrodes and n+ electrode conjunction points arranged on the n+ base contact electrodes; insulating barrier layers are arranged in surrounding regions of the conjunction points; the conductive parts are arranged between adjacent N-type IBC solar cells. The battery string disclosed by the invention has the beneficial effects that the battery string in N-type IBC solar cell spliced connection is realized by adopting the insulating barrier layers and using the conductive part method; because the gap between two battery cells can be controlled to be 0.2mm or lower, the battery string disclosed by the invention has high assembly power compared with that adopting the traditional battery string connection manner. In addition, the assembly manufacturing process is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a battery string connected by N-type IBC solar cells and a preparation method, component and system thereof. Background technique [0002] A solar cell is a semiconductor device that converts light energy into electrical energy. Lower production costs and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. For conventional solar cells at present, the emitter contact electrode and the base contact electrode are respectively located on the front and back sides of the battery sheet. The front of the battery is the light-receiving surface, and the coverage of the metal emitter contact electrode on the front will inevitably cause a part of the incident sunlight to be reflected and blocked by the metal electrode, resulting in a part of optical loss. The coverage area of ​​the front metal electrode of an ordinary crystalline silicon so...

AI Technical Summary

Problems solved by technology

In the previous manufacturing process of N-type IBC solar cells, most of the metallization process is realized by electroplating with a relatively complicated process. This method does have excellent performance in reducing the series resistance of N-type IBC cells and increasing the open-circuit voltage of the cells. However, This method is complex in process, and the discharged waste seriously pollutes the environment, and is incompatible with the mainstream metallization method of current industrial production, so it is not conducive to the promotion of low-cost industrialization

At the same time, in the process of packaging N-type IBC cells into components, due to the large number of emitter and base electrodes and the narrow line width, alignment welding between adjacent cells is very difficult

On the other hand, in the process of packaging batteries into components, a large part of the power loss comes from welding resistance and ribbon resistance. The higher the short-circuit current of a single battery, the greater the power loss.

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