CN113976484B - Grading electric leakage screening method for solar cell - Google Patents

Grading electric leakage screening method for solar cell Download PDF

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Publication number
CN113976484B
CN113976484B CN202111621646.8A CN202111621646A CN113976484B CN 113976484 B CN113976484 B CN 113976484B CN 202111621646 A CN202111621646 A CN 202111621646A CN 113976484 B CN113976484 B CN 113976484B
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judging
electric leakage
irev
range
leakage
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CN113976484A (en
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吴仕梁
路忠林
张凤鸣
叶金荣
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Nanjing Rituo Photovoltaic New Energy Co ltd
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Nanjing Rituo Photovoltaic New Energy Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07CPOSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34Sorting according to other particular properties
    • B07C5/344Sorting according to other particular properties according to electric or electromagnetic properties

Abstract

The invention discloses a grading electric leakage screening method for solar cells, which comprises the following steps: s1, judging the display of the leakage Irev, if the display is normal, entering S2, displaying null, namely, "-", entering S3; s2, judging whether the data of the leakage Irev exceed a preset range, if so, entering S3, and if not, judging that the data of the leakage Irev exceed the preset range; s3, judging the battery performance parameter groups respectively, if one of the battery performance parameter groups exceeds a preset range, judging that the battery piece is invalid, and entering S4, otherwise, judging that the battery piece is normal, and entering S5; s4, judging that the detection is misjudged, and detecting the battery piece again; s5, judging the cell as a normal cell, sorting the cell in a gear position, and performing iterative judgment on the cell; and judging the battery piece exceeding the preset range in each iteration to be the leakage failure piece. The method can prevent the battery piece from being mistakenly judged to be in the normal gear and being transmitted to the assembly process to cause the adverse effects of assembly damage, heating and the like.

Description

Grading electric leakage screening method for solar cell
Technical Field
The invention belongs to the technical field of photovoltaic module production, and particularly relates to a method for solving the problem of misdetection of electric leakage in a solar cell palm IV test.
Background
In the existing IV test sorting process of manufacturing the crystalline silicon solar cell, a halm tester has a defect, when some abnormal cells, particularly cells with extremely large electric leakage, are detected, the leakage value is null, the value is not displayed, and only one transverse line is displayed; the "-" character palm sorting system cannot identify the abnormal film, and the abnormal film can be judged to be a normal film by mistake; the actual leakage value of the abnormal sheet is large, and the abnormal sheet is seriously downloaded to the component and can cause adverse effects such as component damage, heat generation and the like.
Disclosure of Invention
The scheme aims to solve the problem of electric leakage misdetection in a solar battery hall IV test, and provides a novel solar battery hall test grading mode, so that an electric leakage test result is empty, namely a sheet with an abnormal actual leakage value is judged to be in an electric leakage gear through the grading mode, and the abnormal sheet is prevented from being misjudged to be in a normal gear and then conveyed to an assembly process to cause adverse effects such as assembly damage, heating and the like.
The invention discloses a grading electric leakage screening method for a solar cell, which comprises the following steps:
s1, the display of the leakage Irev is individually determined, and if the display is normal, the process proceeds to S2, the display is null, that is, "-", and the process proceeds to S3;
s2, judging whether the value of the electric leakage Irev exceeds a preset range or not, if not, entering S3, and if so, judging that the electric leakage fails to work;
s3, respectively judging each parameter in the battery performance parameter group, if one of the parameters exceeds a preset range, judging that the battery piece is invalid, and entering S4, otherwise, judging that the battery piece is normal, and entering S5;
s4, judging that the detection is misjudged, and detecting the battery piece again or judging the battery piece to be an efficiency failure piece;
s5, judging the cell as a normal cell, sorting the cell at C1-Cn level, carrying out electric leakage Irev iteration judgment on the cell within the range of 1 to n-1, and judging the cell exceeding a preset range as an electric leakage failure cell each time of iteration judgment;
s6, in the process of S5, if the leakage Irev indicates empty, that is, the negative cell is not divided into any shift positions, it is determined that the cell is a leakage failure cell.
Further, the iterative determination specifically includes:
judging electric leakage Irev of the battery piece with the efficiency Eta and the open-circuit voltage Uoc meeting the gear position Cn, firstly, judging display of the electric leakage Irev, judging the numerical value of the electric leakage Irev if the display is normal, and judging whether the numerical value of the electric leakage Irev exceeds a preset range or not; otherwise, entering the (n + 1) th iteration judgment;
if the current exceeds the preset range, the current is judged to be the leakage failure sheet, and the current is divided into gear positions Cn if the current does not exceed the preset range.
Further, the battery performance parameter set comprises: the device comprises a parallel resistor Rshunt, an illumination intensity Insol, a test temperature Tcell, a series resistor Rser, a short-circuit current Isc, an open-circuit voltage Uoc, a filling factor FF and a conversion efficiency Eta parameter.
As a preferred embodiment of the present application, the preset range is a numerical range for Irev and each battery performance parameter, and specifically includes:
the range of the electric leakage Irev standard is 0-a, and a is 0.5-3A;
the standard range of the parallel resistor Rshunt is b-c, b is 10-50 Ohm, and c is 5000-20000 Ohm;
the standard range of the illumination intensity Insol is d-e, d is 950-995 watts per square meter, and e is 1005-1050 watts per square meter;
the standard range of the test temperature Tcell is f-g, f is 21-24 ℃, and g is 26-29 ℃;
the standard range of the series resistor Rser is h-i, h is 0.3-0.8 mOhm, and i is 2.5-5 mOhm;
the standard range of the short-circuit current Isc is j-k, j is 8-10A, and k is 12-16A;
the standard range of open circuit voltage UOC is m-n, m is 0.6-0.65V, and n is 0.7-0.75V;
the standard range of the fill factor FF is p-q, p is 70-75%, and q is 83-88%;
the standard range of the conversion efficiency Eta is r-s, r is 18-20%, and s is 24-28%.
Further, the division of the tap position Cn is preset according to the range of the efficiency Eta interval and the range of the open-circuit voltage Uoc interval and stored in the screening device.
The beneficial effect of this application contains:
the method for solving the problem of the false detection of the electric leakage in the solar cell hall IV test can judge the chip with the empty electric leakage test result, namely the negative-actual electric leakage value is abnormal, into the electric leakage gear, and prevent the abnormal chip from being mistakenly judged to the normal gear and then being transmitted to the component process to cause the adverse effects of component damage, heating and the like.
Drawings
FIG. 1 is a flow chart of a hierarchical leakage screening approach in the prior art;
fig. 2 is a flowchart of a hierarchical leakage screening method provided by the present invention.
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. 2, the present invention is a method for screening graded leakage of a solar cell, which can determine a sheet with a null leakage test result, i.e., "-" with an abnormal actual leakage value, to a leakage gear, and can identify the abnormality of the actual value of leakage Irev, where leakage Irev2 specifically refers to: i is the symbol of the current, rev is the abbreviation of reverse, meaning of the reverse, 2 is different from 1,1 and 2 corresponding to different reverse voltages, 2 corresponding to the reverse voltage is larger than 1, 2 is generally used for judgment in the industry, and is the current value measured by the reverse voltage, namely the leakage value.
Specifically, the method comprises the following steps:
s1, the display of the leakage Irev is individually determined, and if the display is normal, the process proceeds to S2, the display is null, that is, "-", and the process proceeds to S3;
s2, judging whether the value of the electric leakage Irev exceeds a preset range or not, if not, entering S3, and if so, judging that the electric leakage fails to work;
s3, respectively judging each parameter in the battery performance parameter group, if one of the parameters exceeds a preset range, judging that the battery piece is invalid, and entering S4, otherwise, judging that the battery piece is normal, and entering S5;
s4, judging that the detection is misjudged, and detecting the battery piece again or judging the battery piece to be an efficiency failure piece;
s5, judging the cell as a normal cell, sorting the cell at C1-Cn level, carrying out electric leakage Irev iteration judgment on the cell within the range of 1 to n-1, and judging the cell exceeding a preset range as an electric leakage failure cell each time of iteration judgment;
s6, in the process of S5, if the leakage Irev indicates empty, that is, the negative cell is not divided into any shift positions, it is determined that the cell is a leakage failure cell.
Further, the iterative determination specifically includes:
judging electric leakage Irev of the battery piece with the efficiency Eta and the open-circuit voltage Uoc meeting the gear position Cn, firstly, judging display of the electric leakage Irev, judging the numerical value of the electric leakage Irev if the display is normal, and judging whether the numerical value of the electric leakage Irev exceeds a preset range or not; otherwise, entering the (n + 1) th iteration judgment;
if the current exceeds the preset range, the current is judged to be the leakage failure sheet, and the current is divided into gear positions Cn if the current does not exceed the preset range.
Further, the battery performance parameter set comprises: the device comprises a parallel resistor Rshunt, an illumination intensity Insol, a test temperature Tcell, a series resistor Rser, a short-circuit current Isc, an open-circuit voltage Uoc, a filling factor FF and a conversion efficiency Eta parameter.
As a preferred embodiment of the present application, the preset range is a numerical range for Irev and each battery performance parameter, and specifically includes:
the range of the electric leakage Irev standard is 0-a, and a is 0.5-3A;
the standard range of the parallel resistor Rshunt is b-c, b is 10-50 Ohm, and c is 5000-20000 Ohm;
the standard range of the illumination intensity Insol is d-e, d is 950-995 watts per square meter, and e is 1005-1050 watts per square meter;
the standard range of the test temperature Tcell is f-g, f is 21-24 ℃, and g is 26-29 ℃;
the standard range of the series resistor Rser is h-i, h is 0.3-0.8 mOhm, and i is 2.5-5 mOhm;
the standard range of the short-circuit current Isc is j-k, j is 8-10A, and k is 12-16A;
the standard range of open circuit voltage UOC is m-n, m is 0.6-0.65V, and n is 0.7-0.75V;
the standard range of the fill factor FF is p-q, p is 70-75%, and q is 83-88%;
the standard range of the conversion efficiency Eta is r-s, r is 18-20%, and s is 24-28%.
Further, the division of the tap position Cn is preset according to the range of the efficiency Eta interval and the range of the open-circuit voltage Uoc interval and stored in the screening device.
1. Independently judging the electric leakage Irev, screening and judging the sheets with the normally displayed electric leakage value, screening out the battery sheets with the electric leakage value exceeding the normal range to judge that the electric leakage is invalid, and performing next judgment on the rest of the battery sheets; the sheet with the leakage value being null, namely "" is not identified, and the sheet which is not identified enters the next judgment;
2. respectively and independently judging parameters such as a parallel resistance Rshunt, an illumination intensity Insol, a test temperature Tcell, a series resistance Rser, a short-circuit current Isc, an open-circuit voltage Uoc, a filling factor FF, a conversion efficiency Eta and the like, and screening out the battery pieces which exceed the normal range;
3. normal chip position sorting, namely, performing combined sorting on efficiency Eta and open-circuit voltage Uoc to divide the efficiency Eta and the open-circuit voltage Uoc into different positions, adding a leakage current Irev judgment to each combination in the process, as long as the judgment is performed, the chip with the leakage current value being null, namely, "-" is not identified, the chip without identification enters the next judgment, the chip with the leakage current value being null, namely, "-" is not identified in the next judgment, and the circulation is performed; as a result of this operation, none of the slices with a null leakage value, i.e., "-", will be received by the normal gear;
4. in the step 3, the chip with the null leakage value, namely the negative chip is not received by any normal gear, the next step is automatically carried out, at the moment, a judgment is added finally, namely the chip which is not received by the normal gear directly judges that the leakage is invalid and is hit to the leakage invalid gear; the above steps are successful, namely the chip with the abnormal actual leakage value is empty, so that the normal gear is avoided, and finally the chip is judged to be in the leakage failure gear, and the problem of error detection of the leakage in the hall IV test is solved.
The proportion of the electric leakage failure piece screened by a certain batch of raw material abnormal battery pieces in an original grading mode is 15.33%, wherein, part of the pieces with abnormal electric leakage test results are empty, namely, the negative actual electric leakage value are judged to be normal pieces, the proportion of the electric leakage failure piece screened by the method is 22.87%, all the pieces with abnormal electric leakage test results are judged to be electric leakage failure pieces, and the electric leakage failure pieces realize 100% clamping control.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (4)

1. The grading electric leakage screening method of the solar battery is characterized by comprising the following steps:
s1, the display of the leakage Irev is individually determined, and if the display is normal, the process proceeds to S2, the display is null, that is, "-", and the process proceeds to S3;
s2, judging whether the value of the electric leakage Irev exceeds a preset range or not, if not, entering S3, and if so, judging that the electric leakage fails to work;
s3, respectively judging each parameter in the battery performance parameter group, if one of the parameters exceeds a preset range, judging that the battery piece is invalid, and entering S4, otherwise, judging that the battery piece is normal, and entering S5;
s4, judging that the detection is misjudged, and detecting the battery piece again or judging the battery piece to be an efficiency failure piece;
s5, judging the cell as a normal cell, sorting the cell at C1-Cn level, carrying out electric leakage Irev iteration judgment on the cell within the range of 1 to n-1, and judging the cell exceeding a preset range as an electric leakage failure cell each time of iteration judgment;
s6, in the process of S5, if the leakage Irev shows that the battery piece is empty, namely, the battery piece of the negative is not divided into any gear, the battery piece is determined to be a leakage failure piece;
the iterative decision specifically comprises:
judging electric leakage Irev of the battery piece with the efficiency Eta and the open-circuit voltage Uoc meeting the gear position Cn, firstly, judging display of the electric leakage Irev, judging the numerical value of the electric leakage Irev if the display is normal, and judging whether the numerical value of the electric leakage Irev exceeds a preset range or not; otherwise, entering the (n + 1) th iteration judgment;
if the current exceeds the preset range, the current is judged to be the leakage failure sheet, and the current is divided into gear positions Cn if the current does not exceed the preset range.
2. The method of claim 1, wherein the battery performance parameter set comprises: the device comprises a parallel resistor Rshunt, an illumination intensity Insol, a test temperature Tcell, a series resistor Rser, a short-circuit current Isc, an open-circuit voltage Uoc, a filling factor FF and a conversion efficiency Eta parameter.
3. The grading electric leakage screening method for solar cells according to claim 1 or 2, wherein the preset range is a numerical range for Irev and each battery performance parameter, and specifically comprises:
the range of the electric leakage Irev standard is 0-a, and a is 0.5-3A;
the standard range of the parallel resistor Rshunt is b-c, b is 10-50 Ohm, and c is 5000-20000 Ohm;
the standard range of the illumination intensity Insol is d-e, d is 950-995 watts per square meter, and e is 1005-1050 watts per square meter;
the standard range of the test temperature Tcell is f-g, f is 21-24 ℃, and g is 26-29 ℃;
the standard range of the series resistor Rser is h-i, h is 0.3-0.8 mOhm, and i is 2.5-5 mOhm;
the standard range of the short-circuit current Isc is j-k, j is 8-10A, and k is 12-16A;
the standard range of open circuit voltage UOC is m-n, m is 0.6-0.65V, and n is 0.7-0.75V;
the standard range of the fill factor FF is p-q, p is 70-75%, and q is 83-88%;
the standard range of the conversion efficiency Eta is r-s, r is 18-20%, and s is 24-28%.
4. The solar battery grading electric leakage screening method according to claim 3, wherein the classification of the tap Cn is preset and stored in the screening device according to the efficiency Eta interval range and the open circuit voltage Uoc interval range.
CN202111621646.8A 2021-12-28 2021-12-28 Grading electric leakage screening method for solar cell Active CN113976484B (en)

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