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Battery chips precisely machined from back contact solar cell and electrode extraction method

A solar cell and electrode extraction technology, applied in the field of solar cells, can solve the problems of high material cost and high mechanical equipment cost, and achieve the effect of high material cost and mechanical equipment cost, saving processing cost and improving production efficiency.

Active Publication Date: 2016-06-15
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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  • Battery chips precisely machined from back contact solar cell and electrode extraction method
  • Battery chips precisely machined from back contact solar cell and electrode extraction method
  • Battery chips precisely machined from back contact solar cell and electrode extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as Image 6 As shown, the back contact solar cell 10 in this embodiment is a 125X125mm specification produced by SUNPOWER in the United States. It is necessary to cut out 18 battery chips with a specification of 32.4X20.9mm at the position shown in the cutting line 4, and the left and right arrangements are horizontal 3. Blocks, 6 blocks up and down vertically, left and right edges reserved silicon chips for use in other sizes, and 3 blocks on the upper edge are led out, such as Figure 7 As shown, the positive terminal 5 of the battery 10 itself can be contacted with the back. The negative terminal is the negative grid that is not covered by the insulating layer 1 by the conductive layer 2 after the positive grid line 50 is covered by the insulating layer 1. Line 52 converges and conducts, and leads to the negative terminals of the 3 blocks below, such as Picture 9 As shown, the negative terminal 6 of the back contact battery 10 can be used. The positive terminal is...

Embodiment 2

[0044] In embodiment 1, if the conductive layer 2 is a non-solderable material, it can be as Picture 10 with Picture 11 As shown, the conductive solderable layer 3 is silk-printed on the soldering points on the conductive layer 2 and the electrode leads are soldered on the solderable layer 3.

Embodiment 3

[0046] Such as Picture 12 with Figure 13 As shown, in Example 1, a 2mm wide conductive profile of a copper tape 8 with a conductive adhesive layer 7 is used to replace the conductive layer 2, and a hot pressing process is used to bond the copper tape 8 with a conductive adhesive layer 7 to the prepared The back of the insulating layer 1 contacts the corresponding positions of the positive and negative electrode lead-out regions of each battery chip to be cut out of the battery 10 to form the positive and negative electrode bus and lead-out electrode ends of each battery chip.

[0047] The production process is as follows:

[0048] 1. First place the back-contact battery 10 with its backlight side up on the screen printing platform, accurately set the grid line insulation coating screen and the back-contact battery 10 alignment points, and then use the mask screen printing process. Silk-print the insulating layer 1 ink paste to the corresponding position on the backlight surface ...

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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 method for processing various high-efficiency and miniaturized battery chips and electrodes with high-efficiency back-contact solar cells, and belongs to the technical field of solar cells. Background technique [0002] Currently, back-contact solar cells are widely used due to their high power generation efficiency. Researchers continue to research and develop many back-contact solar cells with different structures (hereinafter referred to as back-contact cells or batteries). Back-contact battery refers to a silicon-based solar cell in which the n+ electrode in the emitter area and the p+ electrode in the base area are both located on the back of the silicon solar cell. The back-contact battery eliminates the shading loss of the grid electrode on the front of the battery and effectively improves the battery. Utilization rate and conversion efficiency; easy to assemble, the positive and negative poles are on the back side, the modu...

Claims

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Application Information

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Patent Type & Authority Applications(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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