Solar cell sheet and solar cell module

Abstract

The invention discloses a solar cell sheet and a solar cell module. The solar cell sheet is provided with a front surface and a back surface, wherein the back surface is provided with a plurality of back electrodes, the back electrode comprises a main body used for being connected with a welding strip, a main body longitudinally extends and is provided with a main body center line, each back electrode comprises a first end and a second end which are located on the main body center line, and each back electrode further comprises a current guide part connected with the main body, so that part ofthe current can directly flow to the electrode main body through the current guide part to assist the main gate in collecting the current together so as to reduce the series resistance and improve the efficiency of the cell sheet.

Description

technical field [0001] The invention relates to a solar battery sheet and a solar battery assembly, belonging to the technical field of solar power generation. Background technique [0002] Conventional silver electrodes on the back of solar cells (referred to as back electrodes) usually use segmented back electrodes, that is, each row of back electrodes is divided into multiple segments on average, each segment has the same length, and the spacing between each segment is the same. Usually, there is a gap of 0.5 to 2 mm between the back electrode and the main grid, which is used to reduce the height difference at the junction and avoid poor welding and low tension of the ribbon during the module welding process. As the efficiency requirements of the back side continue to increase, the narrowing of the main gate is one of the optimization directions, but the gap between the back electrode and the main gate will inevitably be narrowed on both sides, resulting in an increase ...

AI Technical Summary

Problems solved by technology

Usually, there is a gap of 0.5 to 2 mm between the back electrode and the main grid, which is used to reduce the height difference at the junction and avoid poor welding and low tension of the ribbon during the module welding process. As the efficiency requirements of the back side continue to increase, the narrowing of the main grid is one of the optimization directions, but the gap between the back electrode and the main grid is bound to be narrowed on both sides, resulting in an increase in series resistance and affecting current collection.

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