Solar battery grid line electrode

Abstract

The invention discloses a solar battery grid line electrode. Lateral grid lines in the solar battery grid line electrode are of the S shape, i.e. two adjacent lateral grid lines are sequentially connected at ports. The S-shaped solar grid lines in the invention furthest reduce the shading area, improve the smearing problem of the grid lines and reduce the consumption of silver paste on the basis of ensuring light current conduction, are beneficial to the reduction of the production cost, and improve the conversion efficiency of a solar battery.

Description

technical field [0001] The invention relates to a front grid line electrode in a crystalline silicon solar cell, in particular to a grid line electrode capable of improving the conversion efficiency of the solar cell. Background technique [0002] At present, the traditional process for preparing grid wire electrodes of conventional solar cells is to print Ag paste on the emitter to form a fixed pattern by screen printing, and then sinter together with the Al electrode on the back. In order to obtain higher conversion efficiency when the area of ​​the solar cell is fixed, the design of the grid electrode on the solar cell plays a pivotal role, which determines the series resistance, the effective light absorption area of ​​the cell, the reverse saturation current, etc. , in order to reduce the shading area of ​​the grid electrode, the grid line is required to be as thin as possible, and at the same time, a certain height of the grid line must be ensured. [0003] In order t...

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Problems solved by technology

[0003] In order to reduce the shading area of ​​the grid electrode, the grid electrode is required to be as thin as possible. However, due to the limitation of the characteristics of the slurry, the width of the fine grid has almost reached the limit value. On this basis, we can only optimize the grid shape design. To achieve the purpose of improving the conversion efficiency, most of the front grid lines of solar cells on the market currently use figure 1 The conventional design shown, but the conventional grid line design is powerless for the case of broken grid on the outer edge of the main grid, and the current on the disconnected grid line can only be lost in vain (such as figure 2 )

In the face of the defects of the conventional design, the improvement of the peripheral sealing design is adopted to better collect the peripheral current (such as image 3 ), but there are two hidden dangers at the same time. First, the four-side sealing undoubtedly increases the area of ​​the two fine grids, thereby increasing the shading area; second, due to the design direction of the thin grids of the two seals and the printing The direction is vertical, and it is more prone to edge fine grid smear, which affects the printing quality, and also indirectly increases the shading area (see Figure 4 )

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