Tandem connection method of photovoltaic double-sided cells

Abstract

The invention discloses a tandem connection method of photovoltaic double-sided batteries, which comprises the following steps of: alternately laying double-sided batteries with upward front surfaces and double-sided batteries with upward back surfaces to form a battery layer; and a lower connecting piece layer and an upper connecting piece layer are laid on the surfaces of the two sides of the battery layer respectively to form a battery string. During series connection, the upper connecting piece and the lower connecting piece do not need to be connected to the bottom surface of the adjacent double-sided battery from the top surface of the double-sided battery, and the upper connecting piece and the lower connecting piece are straightly connected and do not need to be bent in the middle, so that no protruding stress point exists, the development of module thinning is facilitated, and an implementation method is provided for battery thinning. The connecting pieces and the double-sided batteries are separated, all the connecting pieces and the double-sided batteries are respectively, independently and simultaneously grabbed and positioned, and compared with traditional welding, much time can be saved, and the productivity is improved; and meanwhile, the carrying times and paths of the connecting piece and the double-sided battery are reduced, the alignment precision of the connecting piece and the double-sided battery is greatly improved, the assembly welding yield can be improved, and repair is reduced.

Description

technical field [0001] The invention relates to the field of photovoltaics, in particular to a method for connecting photovoltaic double-sided batteries in series. Background technique [0002] Crystalline silicon solar cells are made into photovoltaic modules through series connection and lamination packaging. The welding of cells in series is a major process. The series connection of cells directly affects the performance of the modules and the production speed of the modules. [0003] With the development of photovoltaic technology at any time, there have been double-sided cells that can generate electricity by receiving light from the front and back sides. Modules made of double-sided cells are called double-sided modules. However, the fronts of the double-sided cells in the existing double-sided modules are all facing the same direction. For example, when laying battery strings, the fronts of the double-sided cells are all facing upwards; The top surface of the double-...

AI Technical Summary

Problems solved by technology

However, the fronts of the double-sided cells in the existing double-sided modules are all facing the same direction. For example, when laying battery strings, the fronts of the double-sided cells are all facing upwards; The top surface of the double-sided battery is connected to the bottom surface of the adjacent double-sided battery through a connector (such as a ribbon), that is, the connector needs to be bent from the top surface of the double-sided battery to the bottom surface of the adjacent double-sided battery. At the bend, the connection Parts contact with the edge of the double-sided cell to form a large stress, which will have many adverse effects