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Solar cell front electrode structure

A technology of solar cells and front electrodes, which is applied in the field of solar energy and can solve the problems of large amount of busbar consumables, etc.

Active Publication Date: 2016-09-28
HANWHA SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current generated in the battery generally flows vertically from the interior 5 of the battery to the surface 6 of the battery, then passes through the top doped layer laterally, and finally the contact on the top surface is collected on the sub-gate 1, and the current goes along the sub-gate 1 to the main grid 2, while the current is vertically transmitted to the nearest welding strip 4 through the main grid 2, and the electrons are transmitted along the direction of the minimum voltage drop during the whole process, the current schematic diagram is shown in figure 2 , but with such a structure, the amount of consumables for making the busbar is very large

Method used

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Embodiment 1

[0019] like Figure 5 , 6 As shown, a solar cell front electrode structure includes a plurality of sub-grids 1 arranged on the solar cell and a plurality of main grids for welding ribbons 4, the main grid and the sub-grids 1 are perpendicular to each other, and each main grid is composed of Composed of a plurality of circular positive electrodes 3, each circular positive electrode 3 is respectively arranged on the corresponding sub-grid 1, and has an integral structure with the sub-grid 1, and a gap is left between adjacent circular positive electrodes 3 distance, the number of circular positive electrodes 3 is ≥15. The diameter of the circular positive electrode 3 is consistent with the width of the main grid 2 of a general battery. The circular positive electrode 3 is located in the position of the general main grid in each sub-grid 1 , but they are independent of each other. The circular positive electrode 3 is used for interconnection with the welding ribbon 4 when weldi...

Embodiment 2

[0023] The second embodiment is basically the same as the first embodiment, the difference is: as Figure 7 As shown, a plurality of circular positive electrodes 3 forming a main grid are arranged at intervals on the sub-grid 1 . Viewed from the front, on a single main grid, the number of circular positive electrodes 3 is lower than the number of sub-grids 1, and the sub-grid 1 between adjacent circular positive electrodes 3 is a complete sub-grid 1 with the same width .

[0024] The working principle of the present invention is as follows:

[0025] like image 3 Shown is the relationship between the number of solder joints on a single main grid of the battery and the increased series resistance after welding. When the number of solder joints is between 2 and 5, when the number of solder joints increases, the series resistance drops sharply; when the number of solder joints is higher than 6 , as the number of solder joints increases, the series resistance declines and tends...

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Abstract

The invention discloses a solar battery front electrode structure. The solar battery front electrode structure comprises a plurality of secondary grids and a plurality of main grids, wherein the secondary grids are arranged on a solar battery, the main grids are used for welding solder strips and are perpendicular to the secondary grids, each main grid is composed of a plurality of round positive electrodes, each round positive electrode is arranged on the corresponding secondary grid, each round electrode and the corresponding secondary grid are of an integrated structure, every two round positive electrodes have a partition distance, and the number of the round positive electrodes is greater than or equal to 15. Under the preconditions that package loss of the battery is not reduced and reliability is not reduced, the solar battery front electrode structure can reduce the number of electrode welding spots of the solder strips, reduce the electrode consumption amount, and effectively reduce cost of the battery.

Description

technical field [0001] The invention relates to a solar battery front electrode structure, which belongs to the technical field of solar energy. Background technique [0002] At present, the main component of the electrode material of the solar cell, that is, the auxiliary grid and the main grid, is Ag, which is an expensive and consumes a lot of material in the photovoltaic industry. In order to save costs, it is very important to reduce the consumption of Ag under the premise of affecting the performance. [0003] The front electrode of the solar cell in the prior art is usually designed as a continuous main grid 2 perpendicular to the auxiliary grid 1, such as figure 1 shown. The current generated in the battery generally flows vertically from the interior 5 of the battery to the surface 6 of the battery, then passes through the top doped layer laterally, and finally the contact on the top surface is collected on the sub-gate 1, and the current goes along the sub-gate 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224
CPCH01L31/022433Y02E10/50
Inventor 张舒
Owner HANWHA SOLUTIONS CORP