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Processing method for processing rectangular photovoltaic cell silicon slices through columnar crystal silicon rods

A photovoltaic cell silicon wafer and columnar crystal technology, applied in photovoltaic power generation, stone processing equipment, sustainable manufacturing/processing, etc., to achieve high photoelectric conversion efficiency, improve effective utilization, and reduce the cost of silicon wafers

Active Publication Date: 2018-05-25
江西宇泰新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The shortcomings of the existing technology are obvious. In order to ensure the photoelectric efficiency of photovoltaic modules, the utilization rate of silicon materials has to be sacrificed; similarly, in order to improve the utilization rate of silicon materials, the photoelectric conversion efficiency of photovoltaic modules has to be sacrificed.

Method used

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  • Processing method for processing rectangular photovoltaic cell silicon slices through columnar crystal silicon rods
  • Processing method for processing rectangular photovoltaic cell silicon slices through columnar crystal silicon rods
  • Processing method for processing rectangular photovoltaic cell silicon slices through columnar crystal silicon rods

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Embodiment 1

[0043] A processing method for processing rectangular photovoltaic cell silicon wafers with columnar crystal silicon rods, comprising the following steps:

[0044] Step 1. Confirm and process the cylindrical surface of the silicon rod: process the cylindrical surface of the columnar crystal silicon rod to obtain the cylindrical surface of the crystal silicon rod. The directrix of the cylindrical surface of the crystal silicon rod is a closed curve or consists of several discontinuous curves Connected; Among them, the material of the columnar crystal silicon rod is polysilicon, and there is no requirement for the crystal direction;

[0045] Step 2, cut off the silicon rod: cut off the crystalline silicon rod according to the required length of the rectangular silicon chip, to determine the outline size of the rectangular silicon chip, and determine the standardized length of a group of opposite sides of the cut rectangular silicon chip;

[0046] Step 3, slicing: cutting the cry...

Embodiment 2

[0054] A processing method for processing rectangular photovoltaic cell silicon wafers with columnar crystal silicon rods, the schematic diagram of which is as follows figure 1 and figure 2 As shown, it includes the following steps:

[0055] Step 1: According to the crystal direction of the required silicon wafer, cut off the edge skin on the cylindrical surface 1 of the crystal silicon rod to obtain the silicon block positioning plane 2;

[0056] Step 2: cut off the silicon rod according to the required length, and remove the unusable head and tail;

[0057] Step 3: Confirm the crystal orientation and vertical block to obtain a series of silicon blocks 3 with the same length and different widths;

[0058] Step 4: Remove the irregular sides and corners of the silicon block 3 to meet the requirements, and then chamfer the corners;

[0059] Step 5: Slicing the silicon blocks obtained in Step 4 into groups to obtain silicon wafers 4 .

[0060] In this embodiment, the equival...

Embodiment 3

[0062] A processing method for processing rectangular photovoltaic cell silicon wafers with columnar crystal silicon rods, the schematic diagram of which is as follows image 3 As shown, it includes the following steps:

[0063] Step 1: remove unusable head and tail materials, and process the cylindrical profile 5 of the silicon rod;

[0064] Step 2: cut off the silicon rod according to the required length, and then chamfer;

[0065] Step 3: Slicing the silicon block obtained in Step 2 to obtain a silicon wafer 4 .

[0066] In this embodiment, the crystal orientations of the crystalline silicon rods and silicon slices are not controlled, and the crystalline silicon rods may be polycrystalline silicon. Example 4.

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Abstract

The invention relates to the technical field of crystal silicon photovoltaic cells, in particular to a processing method for processing rectangular photovoltaic cell silicon slices through columnar crystal silicon rods. The processing method comprises the steps of firstly, determining and processing of columnar faces of the silicon rods, secondly, silicon rod cutoff, thirdly, slicing, fourthly, treatment of irregular sides and corners, and fifthly, chamfering and slicing. According to the processing method, after the crystal orientation of the needed crystal silicon slices is determined, a longitudinal cutting technology is adopted for obtaining the crystal silicon slices of the needed size and crystal orientation. The processing method has the advantages that compared with a traditional transverse slicing method, the same rectangular silicon slices are processed, the effective utilization rate of the cylindrical crystal silicon rods can be increased, and under the condition of the same silicon rod utilization rate, the more regular rectangular silicon slices can be processed out; and the silicon slices processed through the method can adjust the voltage, current and power levels of a photovoltaic module in a standardized manner. The photovoltaic module formed by the rectangular silicon slices has higher power density and lower unit cost than the existing technology.

Description

technical field [0001] The invention relates to the technical field of crystalline silicon photovoltaic cells, in particular to a processing method for processing rectangular photovoltaic cell silicon wafers with columnar crystal silicon rods. Background technique [0002] Photovoltaic cells made of single crystal silicon have the characteristics of simple manufacturing process and high photoelectric conversion efficiency. However, in the prior art, during the preparation process of single crystal silicon, since the entire crystal growth is controlled by thermodynamic laws and kinetic processes, the grown single crystal silicon material is often not a very regular cylindrical silicon rod. [0003] Cylindrical silicon rods can usually be cut into circular silicon wafers along the radial direction of the silicon rods, or the cylindrical silicon rods can be processed into rectangular silicon rods first, and then rectangular silicon wafers can be cut out in the radial direction,...

Claims

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Application Information

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IPC IPC(8): B28D5/00H01L31/18
CPCB28D5/00H01L31/1804Y02E10/547Y02P70/50
Inventor 闫平平
Owner 江西宇泰新能源有限公司
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