A method for detecting broken grid defects in EL testing of solar cells

A technology for detection of solar cells and defects, applied in the directions of optical testing defects/defects, electrical components, photovoltaic power generation, etc. Online automation, the effect of reducing fragmentation rate

Active Publication Date: 2020-06-09
HEBEI UNIV OF TECH +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing industrial sites mainly rely on manual visual inspection, with low degree of automation and low detection efficiency
Since the broken grid defect is not obvious, workers will cause visual fatigue for a long time, resulting in a decrease in work efficiency and an increase in false detection rate and missed detection rate
The traditional detection method has been unable to keep up with the process of industrial production, and the characteristics of the material of solar cells require a non-contact method to automatically detect defects

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for detecting broken grid defects in EL testing of solar cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0044] refer to figure 1 as shown, figure 1 It is a flowchart of the detection method of the present invention,

[0045] A method for detection of a solar cell sheet EL test broken grid defect, the method includes four step units:

[0046] The first step, image preprocessing

[0047] 1-1. Image collection: the near-infrared camera collects grayscale images of EL detection solar cells, and the computer reads them;

[0048] 1-2. Threshold segmentation: on th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a grid breakage defect detection method for solar battery EL testing, and is applicable to EL testing grid breakage defect detection on an industrial solar battery site. A detection algorithm is sufficiently applicable to site situations. The method comprises the following steps: firstly, performing simple pretreatment on an acquired image, performing global threshold partitioning, eliminating noise points, and selecting a treatment image area; performing guide filtering, screening a non-probe area, and enabling the non-probe area to cross with images after threshold partitioning so as to obtain a communicating domain; detecting all grids on a solar battery, and acquiring grids by virtue of characteristics of straight lines; finally, enabling the grid breakage defect area to cross with a grid area so as to obtain a grid position, and screening, thereby obtaining accurate grid breakage defect. By adopting the method, non-contact detection is achieved, the detection quality is improved, the debris rate in the detection process is reduced, and on-line automatic detection is effectively achieved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cell detection, and mainly relates to a detection method for a broken grid defect in EL testing of solar cells. Background technique [0002] With the vigorous promotion and application of clean energy in society, the photovoltaic industry has also developed rapidly, and the output of solar cells has been further expanded. As an important carrier of solar power generation, polycrystalline silicon cells are often expected to have a long service life and high conversion rate in terms of economy and applicability. However, in the process of processing and preparation, high-quality technical requirements, cumbersome production processes and material requirements make solar cells prone to various defects. The existence of these defects will reduce the photoelectric conversion efficiency of the battery sheet and reduce the service life. Therefore, defect detection of solar cells is one of the ess...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/95H02S50/15
CPCG01N21/95H02S50/15Y02E10/50
Inventor 刘坤闫皓炜韩江锐文熙李爱梅陈海永胡洁樊雷雷于矗卓王玉崔海根
Owner HEBEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap