CN108010862B

CN108010862B - Rapid detection method of MWT solar cell

Info

Publication number: CN108010862B
Application number: CN201711282004.3A
Authority: CN
Inventors: 孙明亮; 逯好峰; 吴仕梁; 路忠林; 张凤鸣
Original assignee: Jiangsu Sunport Power Corp Ltd
Current assignee: Jiangsu Sunport Power Corp Ltd
Priority date: 2017-12-07
Filing date: 2017-12-07
Publication date: 2020-08-28
Anticipated expiration: 2037-12-07
Also published as: CN108010862A

Abstract

The invention discloses a rapid detection method of an MWT solar cell, which comprises the following steps: step 1, appearance inspection; checking whether the small holes of the cathode points of the MWT solar cell are light-transmitting; step 2, checking the resistance value between the cathode points; measuring the resistance values of any two cathode points; step 3, checking the resistance value between the anode points; the resistance values of any two positive poles are measured. The method has low requirements on environment and tools, is simple and easy to learn, can conveniently and quickly find the poor contact between the front silver and the blocking slurry and between the back silver and the aluminum back field of the MWT solar cell, and is favorable for screening the MWT solar cell with the defects in the production process.

Description

Rapid detection method of MWT solar cell

Technical Field

The invention relates to a rapid detection method of an MWT solar cell, which is used for rapidly judging whether the solar cell has defects or not by detecting the resistance value between different electrode points of the MWT solar cell.

Background

The MWT photovoltaic module is formed by solidifying and bonding glass, packaging materials (such as EVA (ethylene vinyl acetate) adhesive films), MWT solar cells, conductive adhesives, a GPS (global position system) and an integrated conductive back plate at a certain temperature, time and pressure through the packaging materials (the EVA adhesive films).

Because the MWT solar cell is a core raw material of the MWT photovoltaic module, various defects can be generated in the manufacturing process, and if the defective MWT solar cell cannot be screened in time, various defects can be generated in the MWT photovoltaic module.

For MWT solar cells, the most common failures are two of the following:

a) the positive silver of the MWT solar battery is in poor contact with the blocking slurry, so that the resistance value of the negative electrode point of the battery is higher. If such a poor MWT solar cell cannot be screened out, the MWT photovoltaic module is poor in EL detection as indicated by the circle in FIG. 1.

b) Poor contact between the back silver and the aluminum back field of the MWT solar cell results in higher resistance value of the positive pole of the cell. If such a poor MWT solar cell cannot be screened out, the MWT photovoltaic module is poor in EL detection as indicated by the circle in FIG. 2.

Therefore, the method for detecting the poor contact can be quickly screened, and has very important significance for improving the quality of the MWT solar cell and reducing the adverse effect on the subsequent production of the MWT component.

The method can be used for rapidly detecting the poor contact between the front silver and the blocking slurry and between the back silver and the aluminum back field of the MWT solar cell.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problem that poor contact between front silver and blocking slurry and between back silver and an aluminum back field is easy to occur in the production process of the MWT solar cell, the invention provides a rapid inspection method of the MWT solar cell. The method aims to conveniently and quickly find the poor contact between the front silver and the blocking slurry and between the back silver and the aluminum back field of the MWT solar cell, is favorable for screening the MWT solar cell with the defects in the production process, and avoids flowing the MWT solar cell with the defects to the next process, so that the quality of the MWT solar cell is improved, and the adverse effect on the subsequent production of the MWT component is reduced.

The technical scheme is as follows: a method for rapidly detecting an MWT solar cell comprises the following steps:

1. visual inspection

Checking whether the small holes of the cathode points of the MWT solar cell are light-transmitting; if the light-transmitting pore phenomenon exists, the situation that the slurry is not fully filled at the pore of the cathode point is indicated, the MWT solar cell possibly has the problem of poor contact, and the next detection is carried out;

2. resistance value check between negative electrode points

Optionally selecting two cathode points on the back surface of the MWT solar cell, measuring the resistance value between the two cathode points by using a measuring instrument (such as a multimeter, and the like), and if the resistance value is larger than a preset value, indicating that one cathode point has the problem of poor contact;

3. resistance value check between positive poles

Two positive poles are selected at the back of the MWT solar cell optionally, a resistance value between the two positive poles is measured by a measuring instrument (such as a multimeter, and the like), and if the resistance value is larger than a preset value, the problem of poor contact between one positive pole and an aluminum back field is indicated.

Has the advantages that: the rapid detection method for the MWT solar cell provided by the invention has low requirements on environment and tools, is simple, convenient and easy to learn, can conveniently and rapidly find the poor contact between the front silver and the blocking slurry and between the back silver and the aluminum back field of the MWT solar cell, and is favorable for screening the MWT solar cell with the defects in the production process.

Drawings

FIG. 1 is a schematic diagram of an MWT photovoltaic module showing a bad condition during EL detection;

FIG. 2 is a schematic diagram of an MWT photovoltaic module showing a bad condition during EL detection;

FIG. 3 is a schematic diagram of the front structure of an MWT solar cell;

fig. 4 is a schematic diagram of the back side structure of the MWT solar cell.

The names of the parts designated by the numerical symbols are as follows:

1-MWT solar cell positive pole;

2-MWT solar cell cathode point;

3-MWT solar cell aluminum back surface field.

Detailed Description

The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.

As shown in fig. 3 and 4, a method for rapidly detecting an MWT solar cell includes the following steps:

1. visual inspection

And (3) placing the MWT solar cell with the front side upward under light, and checking whether the small holes of the cathode point 2 of the MWT solar cell are light-transmitting. If the small hole light transmission phenomenon exists, the situation that the slurry is not fully filled at the small hole of the cathode point is indicated, the MWT solar cell possibly has the problem of poor contact, and the next detection is carried out.

2. Resistance value check between negative electrode points 2

The MWT solar cells were placed on a table top with the back side up. And turning on the digital multimeter, and selecting a mode for measuring the resistance value. Two measuring pens of the digital multimeter are respectively placed at the central positions of every two cathode points 2 on the back surface of the MWT solar cell, and the resistance values displayed by the digital multimeter are sequentially recorded. If there is a case where the resistance value is larger than the preset value, it indicates that there is a problem of poor contact of the negative electrode point 2.

3. Resistance value check between positive poles 1

The MWT solar cells were placed on a table top with the back side up. And turning on the digital multimeter, and selecting a mode for measuring the resistance value. Two measuring pens of the digital multimeter are respectively placed at the center positions of every two positive poles 1 on the back surface of the MWT solar cell, and the resistance values displayed by the digital multimeter are sequentially recorded. If the resistance value is larger than the preset value, the poor contact between the positive pole 1 and the aluminum back surface field 3 is indicated.

Claims

1. A rapid detection method for an MWT solar cell is characterized by comprising the following steps:

step 1, appearance inspection;

checking whether the small holes of the cathode points of the MWT solar cell are light-transmitting;

step 2, checking the resistance values of the positive silver and the blocking slurry;

measuring the resistance value between any two negative electrode points;

step 3, checking the resistance values of the back silver and aluminum back fields;

the resistance between any two positive poles is measured.

2. The method for rapidly testing the MWT solar battery as claimed in claim 1, wherein in the step 1, whether the small hole of the cathode point of the MWT solar battery is transparent or not is checked; if the light-transmitting pinhole phenomenon exists, the blockage of the cathode point pinholes by the slurry is not fully filled, the MWT solar cell possibly has the problem of poor contact, and the next detection is carried out.

3. The method for rapidly testing the MWT solar cell, as claimed in claim 1, wherein in the step 2, two negative electrode points are selected at the back of the MWT solar cell, the resistance value between the two negative electrode points is measured by a measuring instrument, and if the resistance value is greater than a preset value, the problem of poor contact of one of the negative electrode points is indicated.

4. The method for rapidly testing the MWT solar cell, as claimed in claim 1, wherein in step 3, two positive poles are selected at the back of the MWT solar cell, the resistance value between the two positive poles is measured by a measuring instrument, and if the resistance value is greater than a preset value, the problem of poor contact between one positive pole and the aluminum back field is indicated.