Back-contact solar cell module

Abstract

The invention discloses a back-contact solar cell module. The back-contact solar cell module comprises a first cell, a second cell and a third cell which are connected in series and are adjacent, the back surface of each cell is provided with at least one group of back electrode array and at least one group of hole metal electrode array, the number of the back electrode array on each cell is equal to that of the hole metal electrode array, the electrode distribution structures of adjacent cells are the same, the hole metal electrode array of the first cell is directly connected with the back electrode array on the second cell which is adjacent to the first cell through a flow guidance piece in a broken line or curve way, and the hole metal electrode array of the second cell is directly connected with the back electrode array on the third cell which is adjacent to the second cell through the flow guidance piece in the broken line or curve way. According to the back-contact solar cell module disclosed by the invention, a confluence piece adopted by the traditional back-contact cell in interconnection is omitted, not only is a series welding step omitted and is the welding work amount greatly reduced, but also the electric performance and the total power of the back-contact solar cell module are increased, and the back-contact solar cell module has unexpected technical effect.

Description

technical field [0001] The invention relates to a back contact solar cell assembly, which belongs to the field of solar cells. Background technique [0002] Conventional fossil fuels are being exhausted day by day. Among the existing sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. At present, among all solar cells, crystalline silicon solar cells are one of the solar cells that have been widely commercialized. This is due to the extremely abundant reserves of silicon materials in the earth's crust. , has excellent electrical and mechanical properties. Therefore, crystalline silicon solar cells occupy an important position in the field of photovoltaics. [0003] At present, the back-contact solar cell module (MWT solar cell) has received widespread attention. Its advantages are: because there is no busbar on the front, the welding points of the positive and negative electrodes are on the back of...

AI Technical Summary

Problems solved by technology

[0007] However, the battery assembly with the above-mentioned structure has the following problems: (1) Since the back electrode row and the hole metal electrode row on the battery sheet form axisymmetric through the central axis of the battery sheet, this special electrode structure has great influence on the position, size and positive direction of the electrode. The spacing between the negative electrodes has strict requirements and is not easy to optimize; in addition, for the porous metal electrodes, due to the need to meet the axisymmetric distribution requirements, the porous metal electrodes must not be evenly distributed on the back, thus affecting the transport of carriers. The uniformity of the path affects the electrical performance of the module; (2) Since the cells need to be rotated 180 degrees to achieve welding, an additional process is added, resulting in the possibility of potential fragments. At the same time, due to the need to rotate the cells, it is impossible Automate component welding

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