Solar cells without main grid and photovoltaic module

Abstract

The present invention discloses solar cells without a main grid and a photovoltaic module. The shading area of the cells is reduced, the current transmission path is optimized, the short circuit current is improved, the serial resistance of the cells is reduced, the conversion efficiency of the cells is improved, and the product quality of the solar cell is improved to a large extent. The solar cells without the main grid comprise a substrate having a front surface and a back surface, a positive electrode formed at the front surface of the substrate, the positive electrode is formed by a plurality of fine grids at the front surface of the substrate, the solar cells also comprise multiple rows of welding strips configured to perform collection and transmission of the current collected by each fine grid, each row of the welding strips are connected with the front surface of the substrate through welding points arranged at the front surface of the substrate, and each fine grid is at least in mutual contact with one of the rows of the welding strips for conduction.

Description

technical field [0001] The invention belongs to the field of solar batteries, in particular to a solar battery and a photovoltaic module without a main grid. Background technique [0002] At present, the industrialization technology of crystalline silicon solar cells is very mature. However, compared with conventional energy sources, relatively high cost, low efficiency and high-quality product quality restrict its development. How to reduce costs, improve conversion efficiency and product quality , a lot of research has been done. [0003] According to the data released by the ITRPV (2016) International Photovoltaic Roadmap, as of 2015, the cumulative global shipments of crystalline silicon photovoltaic modules reached 234GW, and the total installed volume was 227GW. Among them, the module shipments in 2014 and 2015 were 39.3GW and 50GW respectively, and the module prices dropped by nearly 20% in these two years. The market's requirements for products will also become hig...

AI Technical Summary

Problems solved by technology

It is found that at the broken grid, the photocurrent transmission is blocked, and the electrons are concentrated on the grid line at the broken grid, which burns the grid line, resulting in blackening of the grid line at the broken grid, resulting in low product efficiency and poor quality

[0007] In order to improve the current transmission path on the surface of the cell, increase the effective conduction of the current, and reduce power loss, theoretically, the more main grids can be designed, the smaller the spacing between the main grids and the path for current transmission from the fine grids to the main grids The shorter the length, the smaller the power loss and the higher the cell conversion efficiency. However, for the existing solar cell process conditions, not any number of busbars can be realized. It is necessary to comprehensively consider electrical performance, silver paste consumption, series resistance, and shading. Factors such as matching rate, component end welding tension and offset, etc.

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