Precise processing of back-contact solar cells into cell chips and electrode lead-out method

A solar cell and back-contact technology, applied in the field of solar cells, can solve the problems of high cost of materials and mechanical equipment, achieve the effects of high cost of materials and mechanical equipment, save processing costs, and improve production efficiency

Active Publication Date: 2017-07-04
SHEN ZHEN TRONY SCI & TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the chip is made of a back-contact battery, which uses a high-precision PCB board alignment electrode lead-out process. For example, the Chinese patent application number is 201410283104.8 and the application number is 201380017058.1. The high-precision PCB plate is used as the base to complete the back contact. Type battery cutting and serial connection of electrode grid lines and PCB board circuit, the material cost and mechanical equipment cost are high

Method used

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  • Precise processing of back-contact solar cells into cell chips and electrode lead-out method
  • Precise processing of back-contact solar cells into cell chips and electrode lead-out method
  • Precise processing of back-contact solar cells into cell chips and electrode lead-out method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as Figure 6 As shown, the back-contact solar cell 10 of this implementation has a specification of 125X125mm produced by SUNPOWER Company of the United States, and it is necessary to cut out 18 battery chips with a specification of 32.4X20. There are 6 blocks vertically and vertically, leaving silicon chips on the left and right edges for use in other sizes, and the positive electrodes of the 3 blocks on the upper edge are drawn out, such as Figure 7 As shown, the positive terminal 5 of the back contact battery 10 itself can be used, and the negative terminal is that after the positive grid line 50 is covered by the insulating layer 1, the negative grid not covered by the insulating layer 1 is covered by the conductive layer 2 on the insulating layer 1. The line 52 is confluenced and conducted, and is drawn out from the negative poles of the three blocks below, such as Figure 9 As shown, the negative terminal 6 of the back contact battery 10 itself can be used,...

Embodiment 2

[0044] In embodiment 1, if the conductive layer 2 is a non-solderable material, it can be as follows Figure 10 and Figure 11 As shown, the conductive solderable layer 3 is screen-printed on the soldering point on the conductive layer 2, and the electrode lead wires are welded on the solderable layer 3.

Embodiment 3

[0046] Such as Figure 12 and Figure 13 As shown, in embodiment 1, the conductive profile of the copper strip 8 with the conductive adhesive layer 7 of 2 mm is used to replace the conductive layer 2, and the hot pressing process is used to bond the copper strip 8 with the conductive adhesive layer 7 to the prepared The back of the insulating layer 1 is in contact with the corresponding position of the lead-out area of ​​the positive and negative electrodes of each battery chip to be cut out on the battery 10, so as to form the positive and negative electrode confluence and lead-out electrode terminals of each battery chip.

[0047] The production process is as follows:

[0048] 1. First place the back-contact battery 10 with the backlight facing up on the screen printing platform, and accurately set the alignment points of the grid line insulation coating screen and the back-contact battery 10, and then use the mask screen printing process, Screen printing the ink paste of ...

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Abstract

The invention discloses an electrode extraction structure for small chips machined from a back contact solar cell and a manufacturing method, belongs to the technical field of solar cells, and aims at solving the problems of a short circuit and reduction of the production cost caused by staggering of adjacent grid lines in the structure and the manufacturing method of an electrode extraction terminal by the small chips with various sizes precisely machined from the efficient back contact cell. The electrode extraction structure is mainly technically characterized by being formed by covering different-polarity grid lines at positive and negative electrode extraction terminals of each cut chip with an insulating layer and a grid line collecting conductive layer for current collection and conduction respectively on the backlight surface of the back contact cell by a mask screen printing process. By implementation of the electrode extraction structure, the qualified rate of high-voltage output chips reaches over 99%; the short circuit between the adjacent grid lines caused by a loop error during collection of the electrode grid lines is eliminated; and the production cost is significantly reduced.

Description

technical field [0001] The invention discloses a high-efficiency back-contact solar cell processed into various high-efficiency miniaturized battery chips and an electrode lead-out method, belonging to the technical field of solar cells. Background technique [0002] At present, back-contact solar cells are widely used due to their high power generation efficiency, and researchers have continuously researched and developed many back-contact solar cells with different structures (hereinafter referred to as back-contact cells or batteries). The back contact cell refers to a silicon substrate solar cell in which the n+ electrode of the emitter region and the p+ electrode of the base region are located on the back of the silicon solar cell. Utilization rate and conversion efficiency; easy to assemble, the positive and negative electrodes are on the back, the components are packaged in a coplanar connection, the interval between the cells is reduced, the packaging density is incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224
CPCH01L31/022458Y02E10/50
Inventor 李毅
Owner SHEN ZHEN TRONY SCI & TECH DEV CO LTD
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