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Crystalline silicon solar Metal Wrap Through (MWT) battery and manufacturing method thereof

A production method and solar energy technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as hidden cracks, fragments, and increased defective products, and achieve the effects of easy interconnection, reduced equipment investment, and accelerated industrialization

Inactive Publication Date: 2012-08-15
CHINA UNITED CLEANING TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Insulating glue is used to isolate the disc from the back field. During welding and lamination, due to heat and extrusion problems, it is easy to cause cracks and fragments, and the number of defective products increases.

Method used

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  • Crystalline silicon solar Metal Wrap Through (MWT) battery and manufacturing method thereof
  • Crystalline silicon solar Metal Wrap Through (MWT) battery and manufacturing method thereof
  • Crystalline silicon solar Metal Wrap Through (MWT) battery and manufacturing method thereof

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Embodiment 1

[0033] Embodiment 1: as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 as shown,

[0034] A method for manufacturing a crystalline silicon solar MWT cell, comprising the following steps: firstly, a figure-splayed distribution of laser holes is drilled on a bare silicon wafer, and then the battery sheet process is performed: texturing, diffusion, PSG removal, PECVD, screen printing, sintering, Laser isolation. The steps of the screen printing section are: ① Simultaneously print the back positive electrode (1) and the back negative electrode (2); ② Print the back electric field (3); ③ Simultaneously print the front grid lines (4) and the front hole filling grid lines (5).

[0035] 1. The biggest feature of the punching pattern is the figure-eight shape, such as figure 2 As shown, about 10 holes in group A in the middle are distributed vertically downward from the center of the silicon wafer, and about 25 holes in groups C and B are located in a figure-eight shape...

Embodiment 2

[0043] A crystalline silicon solar MWT battery and its manufacturing method. The MWT battery realizes the conduction of the upper and lower perforated electrodes through a unique pattern of eight-shaped distribution of holes. Diffusion, PSG removal, PECVD, screen printing, sintering, laser isolation. The steps of the screen printing section are: ① Simultaneously print the back positive electrode (1) and the back negative electrode (2); ② Print the back electric field (3); ③ Simultaneously print the front grid lines (4) and the front hole filling grid lines (5). The interconnection of the cells is all realized on the back side, using the traditional welding process, from the back negative electrode (or back negative electrode) of the battery piece 1 to the back negative electrode (or back negative electrode) of the battery piece 2. The high compatibility of traditional component technology solves the problem of high component cost of MWT batteries in the current market. The sh...

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Abstract

The invention discloses a crystalline silicon solar Metal Wrap Through (MWT) battery and a manufacturing method thereof. The MWT battery is characterized in that conduction of an upper punched electrode and a lower punched electrode is realized by a unique splay distributed punching way; after a bare wafer is punched, steps of wool making, dispersing, Phosphosilicate Glass (PSG) removing, Plasma Enhanced Chemical Vapor Deposition (PECVD), silk screen printing, sintering and laser isolation are carried out, wherein the silk screen printing step is specifically as follows: printing a back positive electrode and a back negative electrode simultaneously; printing a back electric field; and printing front grid lines and front pore filling grid lines simultaneously. Mutual connections of battery pieces are all realized on the back through a traditional welding technique, and the back negative electrode (or the back negative electrode) of the battery piece is serially welded with the back negative electrode (or the back negative electrode) of the battery piece, thus realizing the high compatibility of the manufacturing method with the traditional assembling technique and solving the problem of the MWT battery on the market at present in high assembling cost; and the light shading area of the surface of the battery is reduced from 5-7% of the traditional H-type battery to about 3% of the MWT battery, so that the purposes of increasing the efficiency and reducing the cost are achieved.

Description

technical field [0001] The invention relates to a crystalline silicon solar MWT battery and a manufacturing method thereof. Background technique [0002] Crystalline silicon solar cells are power generating devices that convert light energy into electrical energy using crystalline silicon as a material. [0003] Facing the increasingly serious global energy crisis and environmental protection issues, solar photovoltaic power generation as a clean energy must become the choice. At present, the cost of solar photovoltaic power generation is higher than that of traditional thermal power generation. In order to realize the parity of solar photovoltaic power generation, improving efficiency and reducing costs has become the goal of the entire industry, and the most important part of improving efficiency is the solar cell link. [0004] There are many solutions to improve the efficiency of crystalline silicon solar cells, and MWT cell technology is currently one of the most feasi...

Claims

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Application Information

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IPC IPC(8): H01L31/18H01L31/0224
CPCH01L31/02245H01L31/022433H01L31/0516Y02E10/50
Inventor 孙良欣范圣凯胡盛华全成
Owner CHINA UNITED CLEANING TECH BEIJING
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