A battery string connected by n-type IBC solar cell pieces and its preparation method, component and system

Abstract

The present application relates to a cell string formed by spliced N-type IBC solar cells and a preparation method thereof, a solar cell module, and a solar cell system. The cell string comprises narrow N-type IBC solar cells and a conducting member configured to realize Ohmic connection between the narrow N-type IBC solar cells, with emitter p+ regions and base n+ regions being alternately arranged on a back surface of each of the narrow N-type IBC solar cells, p+ emitter contact electrodes being arranged in the emitter p+ regions, n+ base contact electrodes being arranged in the base n+ regions, further comprising p+ electrode current convergence points arranged on the p+ emitter contact electrodes and n+ electrode current convergence points arranged on the n+ base contact electrodes, with an insulating barrier layer being arranged around the current convergence points, and the conducting member being arranged between the adjacent narrow N-type IBC cells. The present application has the following beneficial effect. In the present application, a cell string formed by spliced N-type IBC solar cells is realized by the use of an insulating barrier layer and a conducting member. Since the gap between the cells may be controlled to be less than 0.2 mm, the power of the solar cell module will be far higher when compared with the conventional connection methods for cell strings. In addition, the manufacturing process of the solar cell module is simple and less costly.

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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