CN111403523A - Solar cell unit and manufacturing method thereof - Google Patents
Solar cell unit and manufacturing method thereof Download PDFInfo
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- CN111403523A CN111403523A CN201811621024.3A CN201811621024A CN111403523A CN 111403523 A CN111403523 A CN 111403523A CN 201811621024 A CN201811621024 A CN 201811621024A CN 111403523 A CN111403523 A CN 111403523A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 158
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims description 18
- 238000010248 power generation Methods 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 8
- KTSFMFGEAAANTF-UHFFFAOYSA-N [Cu].[Se].[Se].[In] Chemical compound [Cu].[Se].[Se].[In] KTSFMFGEAAANTF-UHFFFAOYSA-N 0.000 description 11
- 238000007599 discharging Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- MARUHZGHZWCEQU-UHFFFAOYSA-N 5-phenyl-2h-tetrazole Chemical compound C1=CC=CC=C1C1=NNN=N1 MARUHZGHZWCEQU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- WILFBXOGIULNAF-UHFFFAOYSA-N copper sulfanylidenetin zinc Chemical compound [Sn]=S.[Zn].[Cu] WILFBXOGIULNAF-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
- H01L31/188—Apparatus specially adapted for automatic interconnection of solar cells in a module
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a solar cell unit and a manufacturing method thereof, wherein the solar cell unit comprises a first cell and a second cell, the first cell is electrically connected with the second cell, the rated electrical parameter value of the first cell is different from the test electrical parameter value, and the difference between the test electrical parameter value of the second cell and the test electrical parameter value of the first cell is not more than a grading threshold value. The solar cell unit can improve the utilization rate of the cell, meet the application requirements of diversity, and reduce the production cost of the solar cell unit by using the connection method.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to a solar cell unit and a manufacturing method thereof.
Background
Currently, the Copper Indium Gallium Selenide (CIGS) cell pieces are generally in standard sizes when shipped out of the factory. In order to meet different application requirements, a CIGS standard cell piece needs to be cut into a plurality of nonstandard cell pieces with different sizes, and then the plurality of nonstandard cell pieces are spliced to manufacture solar cells with different sizes and specifications.
As shown in fig. 1 and 2, in the conventional standard CIGS cell, cells with the same number of segments and the same output voltage are connected in parallel, the number of cell segments on each parallel branch is n, and cells with the same cell width L and the same output current are connected in series, wherein the number of segments of a cell is the number of sub-cells included in the cell, and the width of the cell is the width of the sub-cell.
For the non-standard battery slice after cutting and edge cleaning, the original structure of the battery (especially the sub-battery at the edge position) can be changed during the cutting process of the battery slice, so that the no-load voltage value or the short-circuit current value of the battery slice after cutting is changed relative to the no-load voltage value or the short-circuit current value of the battery before cutting. If the connection is simply carried out according to the standard of the rated electrical parameter value of the standard battery piece, namely, the battery pieces with the same number of sections are connected in parallel, the charging and discharging self-consumption phenomenon among the battery pieces can be caused due to the voltage difference among the battery pieces on the same parallel branch, the battery pieces with the same sub-battery width are connected in series, the output power can be obviously reduced due to the short-circuit current difference on the series branch, and the power of the battery formed by splicing the battery pieces is far smaller than the sum of the power of the battery pieces.
In addition, for the non-standard battery piece obtained after cutting and edge cleaning, if a slightly damaged individual sub-battery appears in the battery piece, the whole battery piece cannot be used with the battery piece at the same level due to the slight damage of the individual sub-battery, and the battery piece needs to be cut into smaller battery pieces for reuse or scrapping, so that the utilization rate of the battery piece is reduced, and the production cost is improved.
Disclosure of Invention
In view of this, the present invention provides a solar cell unit and a manufacturing method thereof, in which the utilization rate of the solar cell unit can be increased, the requirement of various applications can be met, and the manufacturing method can reduce the production cost of the solar cell unit.
In order to achieve the above object, a solar cell unit according to an aspect of the present invention includes a first cell and a second cell, the first cell is electrically connected to the second cell, a rated electrical parameter value of the first cell is different from a test electrical parameter value of the first cell, a difference between the test electrical parameter value of the second cell and the test electrical parameter value of the first cell is not greater than a classification threshold, and the classification threshold is 2% of a smaller one of the test electrical parameter value of the first cell and the test electrical parameter value of the second cell.
Optionally, the test electrical parameter value is a test no-load voltage value, and the first battery slice is connected in parallel with the second battery slice.
Optionally, the test electrical parameter value is a test short circuit current value, and the first battery piece is connected in series with the second battery piece.
Optionally, the first cell piece and the second cell piece are both glass-based CIGS cell pieces.
The invention also provides a manufacturing method of the solar cell unit, which comprises the following steps:
providing a first battery piece and a second battery piece, wherein the rated electrical parameter value of the first battery piece is different from the test electrical parameter value of the first battery piece, the difference between the test electrical parameter value of the second battery piece and the test electrical parameter value of the first battery piece is not greater than a grading threshold, and the grading threshold is 2% of the smaller of the test electrical parameter value of the first battery piece and the test electrical parameter value of the second battery piece;
and electrically connecting the first battery piece with the second battery piece.
Optionally, the test electrical parameter value is a no-load voltage value, and the electrical connection is in parallel.
Optionally, the test electrical parameter value is a short circuit current value and the electrical connection is in series.
Optionally, the preparation method further comprises the step of cutting the standard cell to obtain the first cell and the second cell.
Optionally, the standard cell piece is a glass-based CIGS cell piece, and the manufacturing method further includes, before cutting the standard cell piece:
and removing the power generation layer and the back electrode of the standard cell.
Optionally, a width of the back electrode removed is smaller than a width of the power generation layer removed.
Optionally, the removed width of the power generation layer is less than 22 mm.
Based on the above description, the solar cell unit provided in one embodiment of the present invention includes a first cell and a second cell, where a rated electrical parameter value of the first cell is different from a test electrical parameter value of the first cell, a difference between the test electrical parameter value of the second cell and the test electrical parameter value of the first cell is not greater than a grading threshold, and the first cell is electrically connected to the second cell. According to the invention, for the parallel connection mode of the battery plates, the charging and discharging self-consumption phenomenon among the battery plates caused by different electrical parameters on the same parallel branch can be avoided; for the series connection mode of the battery plates, the output power of the battery plate unit can be ensured, and various voltage requirements can be met. Therefore, the solar cell unit can improve the utilization rate of the cell and meet the requirement of diversified application, and the production cost of the solar cell unit can be reduced by adopting the manufacturing method of the solar cell unit provided by the invention.
Drawings
Fig. 1 is a schematic diagram of a parallel connection manner of standard battery plates in the prior art.
Fig. 2 is a schematic diagram of a series connection of standard cells in the prior art.
Fig. 3 is a schematic diagram of a parallel connection manner of non-standard battery pieces according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a series connection of non-standard cells according to an embodiment of the invention.
Fig. 5 is a schematic step diagram of a method for manufacturing a solar cell unit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
The solar cell unit provided by one embodiment of the invention comprises a first cell and a second cell, wherein the first cell is electrically connected with the second cell, a rated electrical parameter value of the first cell is different from a test electrical parameter value of the first cell, a difference between the test electrical parameter value of the second cell and the test electrical parameter value of the first cell is not greater than a grading threshold, and the grading threshold is 2% of a smaller one of the test electrical parameter value of the first cell and the test electrical parameter value of the second cell.
In one embodiment, the solar cell unit is a glass-based solar cell unit. In this embodiment, the first cell piece and the second cell piece are both glass-based Copper Indium Gallium Selenide (CIGS) cell pieces. The glass-based Copper Indium Gallium Selenide (CIGS) cell has the advantages of strong light absorption capacity, good power generation stability and high conversion efficiency. Of course, in other embodiments, the power generation layer material may be selected from one of copper indium selenide, copper indium gallium selenide sulfide, copper zinc tin sulfide, and cadmium telluride. The first battery piece and the second battery piece are electrically connected, and can be connected in parallel or in series. For the parallel connection mode of the first battery piece and the second battery piece, the charging and discharging self-consumption phenomenon between the first battery piece and the second battery piece caused by different electrical parameters on the same parallel branch can be avoided; for the mode that the first battery piece is connected with the second battery piece in series, the output power of the solar battery piece unit can be ensured, and various voltage requirements can be met.
In one embodiment, a cell having a nominal electrical parameter value different from the test electrical parameter value is selected as a first cell, a cell having a test electrical parameter value that differs from the test electrical parameter value of the first cell by no more than a classification threshold value that is 2% of the smaller of the test electrical parameter value of the first cell and the test electrical parameter value of the second cell is selected as a second cell. The first battery piece can be a standard battery piece or a non-standard battery piece obtained by cutting and edge cleaning the standard battery piece; the second battery piece can also be a standard battery piece or a non-standard battery piece obtained by cutting and edge cleaning the standard battery piece, and the corresponding battery piece is selected according to the actual use requirement. It is understood that the standard battery piece refers to a battery piece which is provided with standard size and rated electric parameter value when being shipped from the factory, and the number of the sub-batteries is also fixed. The electrical parameters of a single sub-battery which leaves the factory are generally standard values, so that the electrical parameter value of the standard battery piece can be calculated according to the number of the sub-batteries contained in the standard battery piece, namely the rated electrical parameter value of the standard battery piece.
When the standard cell is cut and edge-cleaned to obtain the non-standard cell, the number of the required sub-cells is determined according to the rated electrical parameter value required by the non-standard cell, but the cell is damaged due to the limitation of the precision of the cutting edge-cleaning process, if the sub-cells are damaged, the power of the sub-cells is broken down or completely fails according to the damage degree, so that the actual electrical parameter value of the non-standard cell, namely the test electrical parameter value, is different from the rated electrical parameter value.
In one embodiment, the rated electrical parameter value of the second cell is the same as the test electrical parameter value, but in other embodiments, the rated electrical parameter value of the second cell may be different from the test electrical parameter value as long as the difference between the test electrical parameter value of the second cell and the test electrical parameter value of the first cell is not greater than the classification threshold.
According to different electric connection modes of the first battery piece and the second battery piece, the electric parameter values are divided into a no-load voltage value and a short-circuit current value. When the first battery piece is connected with the second battery piece in parallel, the test electric parameter value and the rated electric parameter value refer to a test no-load voltage value and a rated no-load voltage value. When the first cell piece is connected with the second cell piece in series, the test electric parameter value and the rated electric parameter value refer to a test short-circuit current value and a rated short-circuit current value.
In one embodiment, the solar cell unit includes a plurality of first cells and second cells. The plurality of first battery pieces and the plurality of second battery pieces are electrically connected, and the plurality of battery pieces with the difference of the test electrical parameter values not larger than the grading threshold value are firstly connected in parallel and then connected in series, or the plurality of battery pieces with the difference of the test electrical parameter values not larger than the grading threshold value are firstly connected in series and then connected in parallel. The number of the first battery pieces and the second battery pieces and the serial-parallel connection mode between the first battery pieces and the second battery pieces are selected according to the requirements of the output electrical parameters of the solar battery piece units. According to the application requirements of the solar cell units under different conditions, the first cells and the second cells in corresponding quantity are selected to be connected in series and in parallel, so that corresponding electrical parameters are output, and the diversified application requirements of the solar cell units can be met.
In one embodiment, the first battery piece and the second battery piece are connected in parallel, and the difference between the test no-load voltage value of the first battery piece and the test no-load voltage value of the second battery piece is not larger than the grading threshold value. And respectively detecting the first battery piece and the second battery piece to obtain a test no-load voltage value of the first battery piece and a test no-load voltage value of the second battery piece. The absolute value of the difference between the test no-load voltage value of the first battery piece and the test no-load voltage value of the second battery piece is not larger than a grading threshold value, the grading threshold value is 2% of the test no-load voltage value of the first battery piece and the test no-load voltage value of the second battery piece, at the moment, the charging and discharging self-consumption phenomenon between the first battery piece and the second battery piece which are connected in parallel can be ignored, and the test no-load voltage value of the first battery piece and the test no-load voltage value of the second battery piece are in the same level. Taking the test no-load voltage value of a single battery piece as an example, the battery pieces with the test no-load voltage value of 1V-1.02V are in the same level. And connecting the first battery piece and the second battery piece with the same test no-load voltage value in parallel to form a solar battery piece unit. Therefore, the charging and discharging phenomena among the cells caused by different electrical parameters on the same parallel branch can be avoided, and the internal loss of the solar cell unit is reduced. Under the condition that the solar cell units have the same conversion efficiency, the power loss of the cells in parallel splicing can be reduced by adopting the test no-load voltage value as the grading.
The solar cell unit shown in FIG. 3 is manufactured byA plurality of battery pieces with the same test no-load voltage value at the same level are connected in parallel, and the test no-load voltage V of the battery pieces on each parallel branchOC1、VOC2、VOCnAnd (3) the battery pieces are in the same level, namely the absolute value of the difference of the test no-load voltage values of the battery pieces on each parallel branch is not greater than the grading threshold, and the grading threshold is 2% of the test no-load voltage value of the battery piece with the smallest test no-load voltage value. Therefore, the self-consumption phenomenon of mutual charging and discharging between the battery pieces caused by voltage difference on the same parallel branch can be avoided; in addition, the sizes of the battery pieces with the same test no-load voltage value may have slight differences, and the size difference of each battery piece does not exceed the required range.
In one embodiment, the first cell piece and the second cell piece are connected in series. The difference between the test short-circuit current value of the first battery piece and the test short-circuit current value of the second battery piece is not larger than the grading threshold value. And respectively detecting the first battery piece and the second battery piece to obtain a test short-circuit current value of the first battery piece and a test short-circuit current value of the second battery piece. The absolute value of the difference between the test short-circuit current value of the first battery piece and the test short-circuit current value of the second battery piece is not larger than a grading threshold value, the grading threshold value is 2% of the smaller one of the test short-circuit current value of the first battery piece and the test short-circuit current value of the second battery piece, at the moment, the short-circuit current difference between the first battery piece and the second battery piece which are connected in series can be ignored, and the test short-circuit current value of the first battery piece and the test short-circuit current value of the second battery piece are in the same grade. Under the same conversion efficiency of the solar cell units, the power loss of the cells in series splicing can be reduced by adopting the test short-circuit current value as classification.
The solar cell unit shown in fig. 4 is formed by connecting a plurality of cells with the same test short-circuit current value in series, and the test short-circuit current I of the cells on each series branchSC1、ISC2、ISCnThe absolute value of the difference of the test short-circuit current values of the battery plates on each series branch is not more than a grading threshold value, and the grading threshold value is the minimum test short-circuit current value2% of the test short-circuit current value of the cell sheet. Therefore, the output power of the solar cell units can be ensured, and the number of the series connection of the cells can be adjusted according to different voltage requirements; in addition, the sizes of the battery pieces with the same test short-circuit current value may have slight differences, and the size difference of each battery piece does not exceed the required range.
According to the solar cell unit provided by the embodiment of the invention, the rated electrical parameter value of the first cell is different from the test electrical parameter value of the first cell, the difference between the test electrical parameter value of the second cell and the test electrical parameter value of the first cell is not greater than the grading threshold, and the first cell is electrically connected with the second cell. For the parallel connection mode of the battery pieces, the charging and discharging self-consumption phenomenon among the battery pieces caused by different electrical parameters on the same parallel branch can be avoided; for the series connection mode of the battery plates, the output power of the battery plate unit can be ensured, and various voltage requirements can be met. The first cell piece and the second cell piece can be combined in series and parallel connection, so that corresponding electrical parameters are output. Therefore, the solar cell unit provided by the embodiment of the invention can improve the utilization rate of the cell and meet the requirement of diversified application.
The manufacturing method of the solar cell unit provided by the embodiment of the invention comprises the steps of S100-S300.
And S100, cutting the standard battery piece to obtain at least two battery pieces.
In one embodiment, the standard cell is a glass-based Copper Indium Gallium Selenide (CIGS) cell, and the step S100 may include the steps of:
and step S110, removing the power generation layer and the back electrode of the standard cell.
The width of the power generation layer which is removed is less than 22 mm. The standard battery pieces are required to be spliced after being cleaned and cut, and a splicing gap of 2mm-3mm is generated when the two battery pieces are spliced. Therefore, as long as the cut edge is not positioned at the outer edge after splicing, the width of the removed power generation layers is less than 22mm, and the distance between the spliced power generation layers can be ensured to be more than 11 mm. Therefore, the power loss of the standard cell piece in the cutting process can be reduced. The width that the back electrode was cleared is less than the width that the electricity generation layer was cleared, and the back electrode of certain width can be remain on battery piece both sides like this, is convenient for install the busbar. The back electrode is preferably a molybdenum layer, which has a good conductivity and ductility as a back electrode.
And step S120, cutting the standard battery pieces according to the requirement of the rated electric parameter value to obtain at least two battery pieces.
The standard battery piece is a battery piece which is provided with standard size and rated electric parameter values when being shipped from a factory, and the number of the sub-batteries is also fixed. The electric parameters of a single sub-battery leaving the factory are generally standard values, so that the corresponding number of sub-batteries is selected according to the requirement of the rated electric parameter value, and the standard battery pieces are cut to obtain at least two battery pieces.
Step S200, testing the electrical parameters of at least two battery pieces to obtain a first battery piece and a second battery piece. In one embodiment, step S200 is specifically: the method comprises the steps of testing at least two battery pieces to obtain a testing electrical parameter value of each battery piece, using the battery pieces with different rated electrical parameter values and testing electrical parameter values as first battery pieces, using the battery pieces with the difference between the testing electrical parameter values and the testing electrical parameter values of the first battery pieces not larger than a grading threshold value as second battery pieces, wherein the grading threshold value is 2% of the smaller one of the testing electrical parameter values of the first battery pieces and the testing electrical parameter values of the second battery pieces.
In one embodiment, step S200 is specifically: and superposing the rated electrical parameter values of the sub-batteries which are not damaged in the battery slices to be used as the test electrical parameter values of the battery slices, using the battery slices with the rated electrical parameter values different from the test electrical parameter values as first battery slices, using the battery slices with the difference between the test electrical parameter values and the test electrical parameter values of the first battery slices not greater than a grading threshold value as second battery slices, wherein the grading threshold value is 2% of the test electrical parameter values of the first battery slices and the test electrical parameter values of the second battery slices.
In one embodiment, the rated electrical parameter value and the test electrical parameter value of the second cell are the same, but in other embodiments, the rated electrical parameter value and the test electrical parameter value of the second cell are not the same as long as the difference between the test electrical parameter value of the second cell and the test electrical parameter value of the first cell is not greater than the classification threshold. And selecting the battery piece with the rated electrical parameter value different from the test electrical parameter value as a first battery piece, and selecting the battery piece with the difference between the test electrical parameter value and the test electrical parameter value of the first battery piece not greater than the grading threshold value as a second battery piece. The first battery piece can be a standard battery piece or a non-standard battery piece obtained by cutting and edge cleaning the standard battery piece; the second battery piece can also be a standard battery piece or a non-standard battery piece obtained by cutting and edge cleaning the standard battery piece, and the corresponding battery piece is selected according to the actual use requirement.
It is to be understood that the test point parameters are not limited to be obtained by testing, and since the battery piece includes a plurality of sub-batteries independent of each other, the damaged battery piece will cause a difference between the rated electrical parameter value and the test electrical parameter value when cutting, and therefore, in other embodiments, the rated electrical parameter value of the sub-battery that is not damaged in the battery piece may be superimposed as the test electrical parameter value of the battery piece.
And step S300, electrically connecting the first battery piece with the second battery piece. The first battery piece and the second battery piece can be connected in parallel or in series.
In one embodiment, the difference between the test no-load voltage value of the first cell and the test no-load voltage value of the second cell is not greater than the classification threshold, and the step of electrically connecting the first cell and the second cell is specifically: and connecting the first battery piece and the second battery piece in parallel. In this embodiment, an absolute value of a difference between a test no-load voltage value of the first cell and a test no-load voltage value of the second cell is not greater than a classification threshold, where the classification threshold is 2% of a smaller one of the test no-load voltage value of the first cell and the test no-load voltage value of the second cell, at this time, a charging and discharging self-consumption phenomenon between the first cell and the second cell connected in parallel may be ignored, and the test no-load voltage value of the first cell and the test no-load voltage value of the second cell are at the same level. And connecting the first battery piece and the second battery piece with the same test no-load voltage value in parallel to form a solar battery piece unit. Therefore, the charging and discharging phenomena among the cells caused by different electrical parameters on the same parallel branch can be avoided, and the internal loss of the solar cell unit is reduced. Under the condition that the solar cell units have the same conversion efficiency, the power loss of the cells in parallel splicing can be reduced by adopting the test no-load voltage value as the grading.
In one embodiment, the difference between the test short-circuit current value of the first cell and the test short-circuit current value of the second cell is not greater than the classification threshold, and the step of electrically connecting the first cell and the second cell specifically comprises: and connecting the first battery piece and the second battery piece in series. In this embodiment, the absolute value of the difference between the test short-circuit current value of the first cell and the test short-circuit current value of the second cell is not greater than the classification threshold, and the classification threshold is 2% of the smaller one of the test short-circuit current value of the first cell and the test short-circuit current value of the second cell. Under the same conversion efficiency of the solar cell units, the power loss of the cells in series splicing can be reduced by adopting the test short-circuit current value as classification.
In one embodiment, the step of electrically connecting the first cell piece and the second cell piece may be to connect the plurality of cell pieces with the difference of the test electrical parameter value not greater than the classification threshold value in parallel and then in series, or connect the plurality of cell pieces with the difference of the test electrical parameter value not greater than the classification threshold value in series and then in parallel. And selecting a cell with a difference between the test electrical parameter value and the test electrical parameter value of the first cell as a second cell, wherein the cell with the difference between the test electrical parameter value and the test electrical parameter value of the first cell being not more than a grading threshold value. The number of the first battery pieces and the second battery pieces and the series-parallel connection mode between the first battery pieces and the second battery pieces are selected according to the requirements of the output electrical parameters of the solar battery piece units. According to the application requirements of the solar cell units under different conditions, the first cells and the second cells in corresponding quantity are selected to be connected in series and in parallel, so that corresponding electrical parameters are output, and the diversified application requirements of the solar cell units can be met.
It is understood that step S100 may be omitted. When the step S100 is omitted, the standard cell piece does not need to be cut to obtain at least two cell pieces. At this time, the battery piece may be a standard battery piece directly purchased or a non-standard battery piece after cutting purchased. And directly carrying out electrical parameter test on the battery slices, selecting the battery slices with different rated electrical parameter values and test electrical parameter values as a first battery slice, selecting the battery slices with the difference between the test electrical parameter values and the test electrical parameter values of the first battery slice not more than a grading threshold value as a second battery slice, wherein the grading threshold value is 2% of the smaller of the test electrical parameter values of the first battery slice and the test electrical parameter values of the second battery slice.
According to the manufacturing method of the solar cell unit provided by the embodiment of the invention, the first cell with the rated electrical parameter value different from the test electrical parameter value and the second cell with the difference between the test electrical parameter value and the test electrical parameter value of the first cell not larger than the grading threshold are electrically connected, so that the formed solar cell unit can improve the utilization rate of the cells and meet the requirement of diversified application, and the manufacturing method can reduce the production cost of the solar cell unit.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the disclosure. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (11)
1. A solar cell unit comprises a first cell and a second cell, wherein the first cell is electrically connected with the second cell, and the solar cell unit is characterized in that: the rated electrical parameter value of the first battery piece is different from the testing electrical parameter value of the first battery piece, the difference between the testing electrical parameter value of the second battery piece and the testing electrical parameter value of the first battery piece is not larger than a grading threshold, and the grading threshold is 2% of the testing electrical parameter value of the first battery piece and the testing electrical parameter value of the second battery piece.
2. The solar cell unit of claim 1, wherein the test electrical parameter value is a test no-load voltage value, and the first cell is connected in parallel with the second cell.
3. The solar cell unit of claim 1, wherein the test electrical parameter value is a test short circuit current value, and the first cell is connected in series with the second cell.
4. The solar cell unit of any one of claims 1-3, wherein the first cell piece and the second cell piece are glass-based CIGS cell pieces.
5. A manufacturing method of a solar cell unit is characterized by comprising the following steps:
providing a first battery piece and a second battery piece, wherein the rated electrical parameter value of the first battery piece is different from the test electrical parameter value of the first battery piece, the difference between the test electrical parameter value of the second battery piece and the test electrical parameter value of the first battery piece is not greater than a grading threshold, and the grading threshold is 2% of the smaller of the test electrical parameter value of the first battery piece and the test electrical parameter value of the second battery piece;
and electrically connecting the first battery piece with the second battery piece.
6. The method of claim 5, wherein the test electrical parameter value is a test no-load voltage value and the electrical connection is parallel.
7. The method of claim 5, wherein the test electrical parameter value is a test short circuit current value and the electrical connection is a series connection.
8. The method for manufacturing the solar cell unit according to claim 5, further comprising a step of cutting a standard cell to obtain the first cell and the second cell.
9. The method of claim 8, wherein the standard cell is a glass-based CIGS cell, and further comprising removing the power generation layer and the back electrode of the standard cell before dicing.
10. The method of claim 9, wherein the removed width of the back electrode is less than the removed width of the power generation layer.
11. The method of claim 10, wherein the removed width of the power generation layer is less than 22 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111834494A (en) * | 2020-07-24 | 2020-10-27 | 浙江晶科能源有限公司 | Preparation method, device and equipment of battery assembly and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111834494A (en) * | 2020-07-24 | 2020-10-27 | 浙江晶科能源有限公司 | Preparation method, device and equipment of battery assembly and storage medium |
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