Solar cell unit, photovoltaic cell module and preparation process thereof

Abstract

The invention discloses a solar cell unit, a photovoltaic cell module and a preparation process thereof. The solar cell unit includes a front bus electrode, a front interconnect electrode, a back bus electrode and a back interconnect electrode; The role of the first strengthening metal layer; the front interconnection electrode is arranged at the front edge of the cell unit, connecting the front bus electrode and / or the first strengthening metal layer; the back bus electrode is provided with a second strengthening metal layer; the back interconnection electrode is connected The back bus electrode and / or the second strengthening metal layer. The invention improves the utilization rate of the incident light by the photovoltaic cell by setting the strengthened metal layer, reduces the internal resistance of the cell unit itself, and simplifies and optimizes the serial process of the cell through the cooperative use of the interconnected metal layer and the interconnected electrodes, and simultaneously cancels the The spacing between the cells in series is improved, so that the effective power generation area of ​​the photovoltaic module is increased and the structure is stable.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell unit, a photovoltaic cell module and a preparation process thereof. Background technique [0002] Conventional photovoltaic cells, such as monocrystalline silicon cells, polycrystalline silicon cells, N-type cells, HIT (heterojunction cells), etc., all have a positive and negative electrode structure design. Among them, the front electrode includes two functional parts, which are thin grid lines and bus electrodes (also called wide grid lines). Bus electrodes, the electric field on the back is used for passivation and reflection on the back; the back bus electrodes and the front bus electrodes are symmetrically arranged up and down, and the number and position are the same. The bus electrodes on the front and back sides are welded together by tinned copper flat strips to realize the series connection of the battery cells. This process and related production equ...

AI Technical Summary

Problems solved by technology

[0004] With the development of technology and industry, the deficiencies of the conventional tandem process are becoming more and more obvious: First, the shading problem of the interconnection ribbon has not been effectively solved. Reducing the width of the flat ribbon can reduce the shading, but it will lead to internal The resistance rises, and the gain outweighs the gain

This process can effectively increase the power generation of photovoltaic modules, but the biggest problem is that in order to reduce the internal resistance of the battery unit, the battery has to be cut into small pieces with a small enough width, which limits the production capacity. In addition, the overly complicated The process is also not conducive to the rapid promotion of technology. The most important thing is that this technology still has not effectively reduced the transmission resistance of the battery itself.

Compared with the conventional battery and module manufacturing process, this stacking technology has indeed changed a lot. First, only the thin grid lines are reserved on the front electrodes of the battery cells to collect current, but the bus electrodes are directly discarded and cut into more After a small unit, the collected current is directly conducted to the next chip by using a thin grid line, but because the cross section of the thin grid line is too small, the efficiency of this technology for current collection and conduction is limited

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