CN110649119A - Solar power generation assembly based on crystalline silicon and preparation method thereof - Google Patents
Solar power generation assembly based on crystalline silicon and preparation method thereof Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 34
- 229910021419 crystalline silicon Inorganic materials 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052709 silver Inorganic materials 0.000 claims abstract description 27
- 239000004332 silver Substances 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 30
- 229910052710 silicon Inorganic materials 0.000 claims description 28
- 239000010703 silicon Substances 0.000 claims description 28
- 238000003466 welding Methods 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 230000008719 thickening Effects 0.000 claims description 7
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000004093 laser heating Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000007650 screen-printing Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 210000004027 cell Anatomy 0.000 description 22
- 235000012431 wafers Nutrition 0.000 description 21
- 239000000463 material Substances 0.000 description 11
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- 229910000510 noble metal Inorganic materials 0.000 description 5
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000969 carrier Substances 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
- H01L31/0508—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 the interconnection means having a particular shape
-
- 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
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic System
-
- 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
- Y02E10/547—Monocrystalline silicon PV cells
-
- 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 crystalline silicon-based solar power generation assembly which comprises a standard cell or a split cell which is formed by equally splitting the standard cell along the direction vertical to a silver lead, and a Z-shaped connecting belt with conductive performance. When the power generation assembly is prepared, a plurality of standard battery pieces or divided battery pieces are connected in series to form a string through the connecting belt, and silver wires of the plurality of standard battery pieces or divided battery pieces are connected end to end in parallel in the parallel direction along the length direction of the connecting belt and are welded on the connecting belt to form parallel connection of the plurality of strings of standard battery pieces or divided battery pieces so as to form a battery piece module with N columns and M rows; and two straight thickened bus bars are respectively arranged at the output ends at two ends in parallel along the direction perpendicular to the series connection and are connected to the Z-shaped connecting belts at two ends of the series-connected standard battery pieces or the split battery pieces for being used for an external circuit. Compared with the laminated tile, the invention saves the manufacturing cost and has the advantages of small internal resistance and power loss of the component, large output power, small hidden danger of hot spot effect and high reliability of the component.
Description
Technical Field
The invention relates to the technical field of solar power generation panel preparation, in particular to a solar power generation assembly based on crystalline silicon and a preparation method thereof.
Background
For a crystal silicon cell component capable of generating electricity by using sunlight, the connection mode between the cells not only influences the generating efficiency, but also influences the use stability and the manufacturing cost.
When two battery pieces are connected in series, the front side of the first battery piece is used as one pole, the back side of the first battery piece and the front side of the second battery piece are welded in series by a welding strip, and the back side of the second battery piece is used as the other pole. Thus, the voltage of the two battery pieces connected in series is twice that of the single piece, and the current is the same as that of the single piece. The conventional battery pack consists of 60 silicon chips, ten battery chips are connected in series according to the method to form a row, and the row are connected in series or in parallel according to the requirements of voltage and current.
In order to reduce the series resistance, a common series connection method is to arrange the solder strips in series from one end of the front side of the silicon wafer to the other end of the front side of the silicon wafer, and then from one end of the front side of the silicon wafer to the other end of the back side of the other silicon wafer. The more solder strips placed on one silicon chip, the smaller the resistance, so that the requirement on the conductivity of the secondary grid line for collecting current (reducing the silver consumption) can be reduced, and the resistance of a lead can be reduced. However, the more solder strips, the more masking light, and the more complicated the manufacturing process, a certain balance must be achieved.
Another method for reducing resistance is to cut a silicon wafer into a plurality of pieces (typically six pieces), then link the small silicon wafers in a tiling mode (the front side of one silicon wafer and the back side of another silicon wafer are stacked, the overlapped edge is controlled to be about 1mm, thus, the generated voltage of each small silicon wafer is not changed, but the current is reduced to one sixth of the original current, after the small silicon wafers are stacked, the voltage is changed into the sum of each small silicon wafer, the current is one sixth of the original current as that of each small silicon wafer, thus the total generated power of the string is not changed, but the internal resistance power loss can be greatly reduced (the power loss is equal to the square of the current multiplied by the internal resistance) The silicon chips are adhered together, so that the cost is obviously increased, the long-term stability after the organic glue is introduced is questioned, and one problem is that when one small silicon chip in a string of battery chips is failed, electricity cannot be conducted, so that the power generation capacity of the whole string is influenced. Moreover, the conduction of the silicon wafers needs to be completed by photon-generated carriers formed under illumination, if one of the silicon wafers is shaded by a cathode, the conduction of the silicon wafer is reduced, and a problem (hot spot) is generated due to generation of much heat, and the conventional method for solving the problem is to add a bypass diode for shunting, so that the generation of the hot spot can be reduced to a certain extent, but the whole generated energy is greatly reduced.
In summary, the following problems exist in the existing battery piece connection mode in the current industry:
1) the multi-main-grid whole battery is integrally connected in series or partially connected in series, when the module is partially shielded by leaves (bird droppings or other) to block sunlight, the conductivity of the part is reduced, high resistance is generated at the part and then the part is overheated locally, so that hot spots occur in the component, and even fire is likely to occur;
2) although some technologies (such as shingle lamination) use a method of laminating and pressing standard battery pieces after being cut, the cut battery pieces are connected in series, material waste is caused during lamination, and expensive noble metal conductive adhesive is used, so that the product cost is greatly increased;
3) although one technique (such as interconnection) solves the possible hot spot problem by connecting the batteries in series and parallel, the conventional welding strips are used to be adjacent and connect the upper and lower surfaces of the batteries when the batteries are welded in series, which causes excessive power loss inside the assembly and is not beneficial to improving the power generation efficiency.
The above three conventional technologies have the defects of being incapable of considering manufacturing cost, reliability and improving power output efficiency, so that a more effective component connection mode is needed to reduce internal resistance and increase effective power generation area, and meanwhile, the problem that shunting is needed due to power generation failure of a certain battery can be shunted.
Disclosure of Invention
In order to solve the technical problem, the invention provides a crystalline silicon-based solar power generation assembly, which comprises a standard cell piece with standard size specification, a Z-shaped connecting belt used for connecting the standard cell piece and having conductive performance, and a straight thickened bus belt arranged on the standard cell piece at the output ends of two ends;
the connecting belt is provided with two plate-shaped straight parts which are integrally connected through a middle vertical part to form a right-angle Z shape, and the depth of a right angle formed by the straight parts and the vertical part along the direction of the vertical part is close to the thickness of the standard battery piece;
the lower surface of a first standard battery piece is welded to the upper surface of the straight part on the lower side of the connecting band, a silver wire for collecting battery current is perpendicular to the length direction of the connecting band, the upper surface of a second standard battery piece is welded to the lower surface of the straight part on the upper side of the connecting band, the silver wire for collecting battery current is perpendicular to the length direction of the connecting band, the lower surface of the second standard battery piece and a third standard battery piece are spliced by another connecting band, and the like, and a plurality of standard battery pieces are connected in series by a right-angle Z-shaped connecting band and are superposed in potential;
welding a plurality of standard battery pieces on the connecting belt in parallel along the length direction of the connecting belt to form equipotential parallel connection of a plurality of strings of standard battery pieces so as to form an NxM standard battery piece module, wherein N represents the number of parallel columns, and M represents the number of series rows;
and the two straight thickened bus bars are respectively arranged at the output ends of the two ends in parallel along the direction perpendicular to the series connection direction and are connected to Z-shaped connecting belts at the two ends of the serially connected standard battery plates to be used for an external circuit.
The length of the connecting belt is more than or equal to the length of the two standard battery pieces in the direction perpendicular to the silver wire, the thickness of the belt material of the connecting belt is 0.01-0.5 mm, and the width of the belt material of the connecting belt is 0.2-5 mm; the straight portion of connecting band is followed with the right angle that the vertical part formed standard battery piece parallel direction length is 0.1 ~ 2.5mm, follows standard battery piece vertical direction degree of depth is 0.05 ~ 0.2mm and with the thickness of standard battery piece is close.
Meanwhile, the preparation method of the power generation assembly adopting the standard battery piece comprises the following steps:
1) firstly, obtaining a crystalline silicon solar standard cell, respectively designing a positive electrode and a negative electrode on the upper surface and the lower surface of the silicon wafer, and forming a plurality of silver leads for collecting conductive particles and leading out current in a screen printing mode; meanwhile, a Z-shaped connecting belt with a corresponding length is designed according to the length of the standard battery piece to be connected in parallel;
2) the standard battery plates are connected in parallel:
firstly, welding the lower surface of a first standard battery piece to the upper surface of the flat part at the lower side of the first connecting belt, enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt, and then welding a plurality of standard battery pieces on the connecting belt in parallel end to end along the length direction of the connecting belt to form parallel connection of a plurality of strings of standard battery pieces;
3) series connection of standard cells:
based on the parallel connection, welding the upper surface of the standard battery plate connected in parallel in the second group to the lower surface of the straight part on the upper side of the first connecting belt, enabling a silver wire for collecting battery current to be vertical to the length direction of the connecting belt, and then using another connecting belt to serially splice the lower surface of the standard battery plate connected in parallel in the step 2) in the second group and the standard battery plate connected in parallel in the step 2) in the third group;
4) and (3) forming a standard cell module: based on the steps 2) and 3), sequentially analogizing, two flat thickened bus bars are respectively arranged on the standard battery plates at the output ends of two ends in parallel along the serial connection direction and partially protrude out of the standard battery plates for an external circuit, so that a plurality of standard battery plates are connected in series and in parallel to form an NxM standard battery plate module, wherein N represents the number of parallel columns, and M represents the number of serial rows.
The connecting band is made of a copper substrate tinned strip or a composite metal strip and is obtained in a pre-forming or online forming mode.
Wherein, the welding mode in the steps 2) to 4) is any one of infrared heating, laser heating, conductive adhesive bonding and conductive resin bonding.
Based on the requirement of further improving the power generation efficiency, the invention also provides another solar power generation assembly based on crystalline silicon, which comprises split battery pieces, a Z-shaped connecting belt and a straight thickening confluence belt, wherein the split battery pieces are equally split and cut by standard battery pieces along the direction vertical to the silver wire, the Z-shaped connecting belt is used for connecting the split battery pieces and has the conductive performance, and the straight thickening confluence belt is arranged on the output ends of two ends of the split battery pieces;
the connecting belt is provided with two plate-shaped straight parts which are integrally connected through a middle vertical part to form a right-angle Z shape, and the depth of a right angle formed by the straight parts and the vertical part along the direction of the vertical part is close to the thickness of the battery piece;
the lower surface of the first piece of the split battery piece is welded to the upper surface of the straight part at the lower side of the connecting belt and enables the silver wire for collecting battery current to be perpendicular to the length direction of the connecting belt, the upper surface of the second piece of the split battery piece is welded to the lower surface of the straight part at the upper side of the connecting belt and enables the silver wire for collecting battery current to be perpendicular to the length direction of the connecting belt, the lower surface of the second piece of the split battery piece and the third piece of the split battery piece are spliced by another connecting belt, the rest is done in the same way, and the right-angle Z type is adopted to connect the split battery pieces in series;
welding a plurality of the split battery pieces on the connecting belt in parallel along the length direction of the connecting belt to form parallel connection of a plurality of strings of the split battery pieces so as to form an NxM split battery piece module, wherein N represents the number of parallel columns, and M represents the number of series rows;
and the two straight thickened bus bars are respectively arranged at the output ends of the two ends in parallel along the direction perpendicular to the series connection direction and are connected to Z-shaped connecting belts at the two ends of the serially-connected split battery pieces to be used for an external circuit.
The length of the connecting belt is more than or equal to the length of the two divided battery pieces in the direction perpendicular to the silver wire, the thickness of a belt material of the connecting belt is 0.01-0.5 mm, and the width of the belt material of the connecting belt is 0.2-5 mm; the straight portion of connecting band is followed with the right angle that the vertical part formed cut battery piece parallel direction length and be 0.1 ~ 2.5mm, follow cut battery piece vertical direction degree of depth be 0.05 ~ 0.2mm and with the thickness of cutting the battery piece is close.
Meanwhile, the preparation method of the power generation assembly adopting the split battery pieces comprises the following steps:
1) firstly, obtaining a crystalline silicon solar standard cell, respectively designing a positive electrode and a negative electrode on the upper surface and the lower surface of the silicon wafer, and forming a plurality of silver leads for collecting conductive particles and leading out current in a screen printing mode; meanwhile, a Z-shaped connecting belt with a corresponding length is designed according to the length of the standard battery piece to be connected in parallel;
2) dividing and cutting the standard battery piece into equal parts: before manufacturing the battery piece assembly, equally cutting the standard battery piece in a mode of laser processing perpendicular to the direction of the silver wire according to requirements;
3) the divided battery pieces are connected in parallel:
firstly, welding the lower surface of a first divided battery piece to the upper surface of the flat part at the lower side of a first connecting belt, enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt, and then welding a plurality of divided battery pieces on the connecting belt in parallel end to end along the length direction of the connecting belt to form parallel connection of a plurality of strings of divided battery pieces;
4) series connection of the split battery pieces:
based on the parallel connection, welding the upper surface of the second group of the parallel-connected split battery pieces to the lower surface of the upper straight part of the first connecting belt, enabling silver wires for collecting battery current to be perpendicular to the length direction of the connecting belt, and then using the other connecting belt to serially splice the lower surface of the second group of the parallel-connected split battery pieces in the step 3) and the split battery pieces in the step 3) in parallel;
5) and (3) forming a split battery piece die: based on the steps 3) and 4), sequentially analogizing, arranging two flat thickened bus bars at the output ends of the two ends in parallel along the series connection direction respectively, and partially protruding the split battery pieces to be used for an external circuit, so that the split battery pieces are connected in series and in parallel to form an NxM split battery piece module, wherein N represents the number of parallel columns, and M represents the number of series lines.
The connecting band is made of a copper substrate tinned strip or a composite metal strip and is obtained in a pre-forming or online forming mode.
Wherein, the welding mode in the steps 3) to 5) is any one of infrared heating, laser heating, conductive adhesive bonding and conductive resin bonding.
Through the technical scheme, the invention has the beneficial effects that:
1) because the laminated tile connection mode in the prior art has the laminating waste of the silicon wafer, the connection structure and the preparation method provided by the invention save the silicon wafer cost compared with the laminated tile connection mode in the prior art;
2) because the laminated tile connection mode in the prior art needs to adopt noble metal conductive adhesive for laminating connection, compared with the laminated tile, the connection structure and the preparation method provided by the invention save the noble metal conductive adhesive and reduce the manufacturing cost;
3) because the series-connection and parallel-connection coexistent NxM module structure is adopted and connected through the Z-shaped connecting band with a special structure, the module has small internal resistance, and the output power is higher than that of the traditional laminated tile, half-piece and spliced piece structures, thereby effectively reducing the power loss and improving the power generation efficiency;
4) because the plurality of strings of battery pieces connected in series are connected in parallel in the length direction of the connecting belt, when a certain battery piece of one string of battery pieces has a fault and current cannot pass through, the current can flow to another string of battery pieces through the connecting belt, and the current can flow back to the next normal battery piece of the first string to continue generating and superposing after the first string of fault battery pieces is avoided, so that the power loss and the hot spot effect of the whole string of battery pieces caused by the fault of a certain battery piece on the certain string are solved, and the reliability of the assembly is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a schematic diagram of a standard cell disclosed in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a diced cell piece formed by equally dividing and dicing the standard cell piece shown in FIG. 1 in a direction perpendicular to a silver wire according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of a Z-shaped connecting band according to an embodiment of the present invention;
fig. 4 and 5 are schematic diagrams of a splicing structure of the divided battery piece and the connecting belt disclosed by the embodiment of the invention;
fig. 6 and 7 are schematic views of a connection structure of the end portion output end divided cell pieces and the flat thickening bus bar according to the embodiment of the present invention;
FIGS. 8 and 9 are schematic structural diagrams of 2 × 2 and 4 × 5 power generation modules according to embodiments of the present invention;
FIG. 10 is a schematic structural diagram of an NxM power generation module according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a standard 6 × 60 power generation assembly mechanism according to an embodiment of the present invention.
The figures in the drawings represent:
10. standard cell 11, divided cell 20, connecting band
21. Straight portion 22, vertical portion 30, straight thickened bus bar
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1 (this example is a power generation module formed by splicing standard battery pieces):
the crystalline silicon-based solar power generation assembly provided by the invention comprises a standard cell 10 (as shown in figure 1, the size specifications of the existing crystalline silicon solar standard cell 10 are 156.75 mm by 156.75 mm, 156.85 mm by 156.85 mm, 161 mm by 161 mm and 166mm by 166mm at present2Etc., without specifically limiting the specification),A Z-shaped connecting strip 20 (shown in fig. 3, the material of the Z-shaped connecting strip is usually a copper-based tin-plated or composite metal strip) for connecting the standard battery pieces 10 and having electrical conductivity, and a flat thickened bus strip disposed on the standard battery pieces 10 at the two ends of the connecting strip; as shown in fig. 3, the connecting band 20 has two plate-shaped straight portions 21, and the two straight portions 21 are integrally connected by a middle vertical portion 22 to form a right-angle Z shape, the length of the connecting band 20 is greater than or equal to the length of the two standard battery pieces 10 along the direction perpendicular to the silver wire, the thickness of the band of the connecting band 20 is 0.01-0.5 mm, and the width of the band of the connecting band 20 is 0.2-5 mm; the length of the right angle formed by the straight portion 21 and the vertical portion 22 of the connecting band 20 along the parallel direction of the standard battery piece 10 is 0.1-2.5 mm, and the depth h along the vertical direction of the standard battery piece 10 is 0.05-0.2 mm and is similar to the thickness of the standard battery piece 10.
The preparation steps of the crystalline silicon-based solar power generation assembly provided in embodiment 1 are as follows:
1) firstly, obtaining a crystalline silicon solar standard cell 10, respectively designing a positive electrode and a negative electrode on the upper surface and the lower surface of a silicon wafer, and forming a plurality of silver leads for collecting conductive particles and leading out current in a screen printing mode; meanwhile, a Z-shaped connecting band 20 with a corresponding length is designed according to the length of the standard battery piece 10 which needs to be connected in parallel, the connecting band 20 is made of a copper-based material tinned strip or a composite metal strip and is obtained in a pre-forming or on-line forming mode;
2) the standard battery pieces 10 are connected in parallel:
firstly, welding the lower surface of a first standard battery piece 10 to the upper surface of a lower side straight part 21 of a first connecting belt 20, enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt 20, and then welding the silver wires of a plurality of standard battery pieces 10 in parallel end to end along the length direction of the connecting belt 20 on the connecting belt 20 to form parallel connection of a plurality of strings of standard battery pieces 10;
3) series connection of standard battery plates 10:
based on the parallel connection, the upper surface of the second group of the standard battery pieces 10 connected in parallel is welded to the lower surface of the upper flat part 21 of the first connecting band 20, the silver wires for collecting the battery current are perpendicular to the length direction of the connecting band 20, and then the lower surface of the second group of the standard battery pieces 10 connected in parallel in the step 2) and the third group of the standard battery pieces 10 connected in parallel in the step 2) are spliced in series by another connecting band 20 (as shown in fig. 4);
4) and (3) molding the standard battery piece 10 module: based on steps 2) and 3), sequentially analogizing, two straight thickened bus strips are respectively arranged on the standard battery pieces 10 at the output ends of the two ends in parallel along the serial direction, and part of the bus strips protrudes out of the standard battery pieces 10 to be used for an external circuit, so that a plurality of standard battery pieces 10 are connected in series and parallel to form an NxM power generation assembly shown in fig. 5 and 10, wherein N represents the number of parallel columns, and M represents the number of serial rows; the welding mode is any one of infrared heating, laser heating, conductive adhesive bonding and conductive resin bonding.
Example 2 (the present example is a power generation module formed by splicing divided battery pieces):
the invention also provides another crystalline silicon-based solar power generation assembly, which comprises split battery pieces 11 (the split number is 1-20 as shown in fig. 2, the standard mode is divided into 6 pieces as equally divided) along the direction vertical to a silver wire by a standard battery piece 10 (as shown in fig. 1), a Z-shaped connecting belt 20 (shown in fig. 3, the material of the Z-shaped connecting belt is usually copper-based material tin plating or a composite metal belt material) which is used for connecting the split battery pieces 11 and has conductive performance, and a straight thickening confluence belt (shown in fig. 6 and 7) arranged on the split battery pieces 11 at the output ends of two ends; referring to fig. 3, the connecting band 20 has two plate-shaped flat portions 21, the two flat portions 21 are integrally connected by a middle vertical portion 22 to form a right-angle Z shape, the length of the connecting band 20 is greater than or equal to the length of the two divided battery pieces 11 along the direction perpendicular to the silver wire, the thickness of the band of the connecting band 20 is 0.01-0.5 mm, and the width of the band of the connecting band 20 is 0.2-5 mm; the length of the right angle formed by the straight portion 21 and the vertical portion 22 of the connecting band 20 along the parallel direction of the battery piece 11 is 0.1-2.5 mm, and the depth along the vertical direction of the battery piece 11 is 0.05-0.2 mm and is close to the thickness of the battery piece 11.
The preparation steps of the crystalline silicon-based solar power generation assembly provided in this embodiment 2 are as follows:
1) firstly, obtaining a crystalline silicon solar standard cell 10, respectively designing a positive electrode and a negative electrode on the upper surface and the lower surface of a silicon wafer, and forming a plurality of silver leads for collecting conductive particles and leading out current in a screen printing mode; meanwhile, a Z-shaped connecting band 20 with a corresponding length is designed according to the length of the standard battery piece 10 which needs to be connected in parallel, the connecting band 20 is made of a copper-based material tinned strip or a composite metal strip and is obtained in a pre-forming or on-line forming mode;
2) halving and cutting of the standard battery piece 10: before manufacturing the battery piece assembly, equally cutting the standard battery piece 10 in a manner of laser processing perpendicular to the direction of the silver wire according to requirements;
3) the battery pieces 11 are connected in parallel:
firstly, welding the lower surface of a first cut battery piece 11 to the upper surface of a lower side straight part 21 of a first connecting belt 20, enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt 20, and then welding a plurality of cut battery pieces 11 on the connecting belt 20 in parallel end to end along the length direction of the connecting belt 20 to form parallel connection of a plurality of strings of cut battery pieces 11;
4) series connection of the divided cell pieces 11:
based on the parallel connection, the upper surface of the second group of the parallel-connected battery pieces 11 is welded to the lower surface of the upper flat part 21 of the first connecting band 20, silver wires for collecting battery current are perpendicular to the length direction of the connecting band 20, and then the lower surface of the second group of the parallel-connected battery pieces 11 adopting the step 3) and the third group of the parallel-connected battery pieces 11 adopting the step 3) are spliced in series by another connecting band 20 (as shown in fig. 4);
5) forming the module of the battery piece 11: based on steps 3) and 4), sequentially analogizing, two straight thickened bus strips are respectively arranged on the split cell pieces 11 at the output ends of the two ends in parallel along the serial direction, and part of the bus strips protrudes out of the split cell pieces 11 to be used for an external circuit (as shown in fig. 6 and 7), so that the split cell pieces 11 are connected in series and parallel to form an N × M power generation assembly as shown in fig. 5 and 10, wherein N represents the number of parallel columns, and M represents the number of serial rows (as shown in fig. 8 and 9 respectively as a schematic structural diagram of 2 × 2 and 4 × 5 power generation assemblies); the welding mode is any one of infrared heating, laser heating, conductive adhesive bonding and conductive resin bonding.
Because the laminated tile connection mode in the prior art has the laminating waste of the silicon chip, the connection structure provided by the invention saves the cost of the silicon chip compared with the laminated tile connection mode in the prior art; because the laminated tile connection mode in the prior art needs to adopt noble metal conductive adhesive for laminating connection, compared with the laminated tile, the connection structure provided by the invention saves the noble metal conductive adhesive and reduces the manufacturing cost; because the series-connection and parallel-connection coexistent N multiplied by M power generation components are connected through the Z-shaped connecting band 20 with a special structure, the internal resistance of the components is small, and the output power is greater than that of the traditional laminated tile, half-piece and spliced piece structures, thereby effectively reducing the power loss and improving the power generation efficiency; because the plurality of series-connected battery pieces are connected in parallel in the length direction of the connecting belt 20, when a certain battery piece of one series of battery pieces has a fault and current cannot pass through, the current can flow to another series of battery pieces through the connecting belt 20, and the current can flow back to the next normal battery piece of the first series to continue to generate power and overlap after the first series of fault battery pieces are avoided, so that the power loss and the hot spot effect of the whole series of battery pieces caused by the fault of the certain battery piece on the certain series are solved, and the reliability of the assembly is high.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the above-described embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The solar power generation assembly based on crystalline silicon is characterized by comprising a standard cell (10) with standard size specification, a Z-shaped connecting belt (20) which is used for connecting the standard cell (10) and has conductive performance, and a straight thickening bus bar which is arranged at the output ends of two ends of the standard cell (10);
the connecting belt (20) is provided with two plate-shaped straight parts (21), the two straight parts (21) are integrally connected through a middle vertical part (22) to form a right-angle Z shape, and the depth of a right angle formed by the straight parts (21) and the vertical part (22) along the direction of the vertical part (22) is similar to the thickness of the standard battery piece (10);
the lower surface of a first standard battery piece (10) is welded to the upper surface of the flat part (21) at the lower side of the connecting band (20) and silver wires for collecting battery current are vertical to the length direction of the connecting band (20), the upper surface of a second standard battery piece (10) is welded to the lower surface of the flat part (21) at the upper side of the connecting band (20) and silver wires for collecting battery current are vertical to the length direction of the connecting band (20), the lower surface of the second standard battery piece (10) is spliced with a third standard battery piece (10) by another connecting band (20), and the like, and the standard battery pieces (10) are connected in series by adopting a right-angle Z-shaped connecting band (20);
welding a plurality of standard battery pieces (10) on the connecting belt (20) in parallel along the length direction of the connecting belt (20) to form parallel connection of a plurality of strings of standard battery pieces (10) so as to form an NxM standard battery piece module, wherein N represents the number of parallel columns, and M represents the number of series rows;
the two straight thickened bus bars are respectively arranged at the output ends of the two ends in parallel along the direction perpendicular to the series connection and are connected to the Z-shaped connecting bands (20) at the two ends of the standard battery pieces (10) which are connected in series for being used for an external circuit.
2. A crystalline silicon-based solar power module as defined in claim 1, wherein the length of the connecting strip (20) is at least greater than or equal to the length of two standard cells (10) in the direction perpendicular to the silver wires, the thickness of the strip of the connecting strip (20) is 0.01-0.5 mm, and the width of the strip of the connecting strip (20) is 0.2-5 mm; straight portion (21) of connecting band (20) are followed with the right angle that vertical part (22) formed standard battery piece (10) parallel direction length is 0.1 ~ 2.5mm, follows standard battery piece (10) vertical direction degree of depth is 0.05 ~ 0.2mm and with the thickness of standard battery piece (10) is close.
3. A method for preparing a crystalline silicon-based solar power module according to claim 1 or 2, characterized by comprising the steps of:
1) firstly, obtaining a crystalline silicon solar standard cell (10), respectively designing a positive electrode and a negative electrode on the upper surface and the lower surface of a silicon wafer, and forming a plurality of silver leads in a screen printing mode for collecting conductive particles and leading out current; meanwhile, a Z-shaped connecting belt (20) with corresponding length is designed according to the length of the standard battery piece (10) which needs to be connected in parallel;
2) the standard battery plates (10) are connected in parallel:
firstly, welding the lower surface of a first standard battery piece (10) to the upper surface of the flat part (21) at the lower side of the first connecting belt (20) and enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt (20), and then welding a plurality of standard battery pieces (10) on the connecting belt (20) in parallel end to end along the length direction of the connecting belt (20) to form parallel connection of a plurality of strings of standard battery pieces (10);
3) series connection of standard cells (10):
based on the parallel connection, welding the upper surface of the standard battery piece (10) in parallel connection of a second group to the lower surface of the straight part (21) on the upper side of the first connecting belt (20) and enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt (20), and then splicing the lower surface of the standard battery piece (10) in parallel connection of the second group in the step 2) and the standard battery piece (10) in parallel connection of the third group in the step 2) in series by using another connecting belt (20);
4) and (3) forming a standard battery piece (10) module: based on the steps 2) and 3), sequentially analogizing, two flat and thickened bus bars are respectively arranged on the standard battery pieces (10) at the output ends of the two ends in parallel along the serial connection direction, and partially protrude out of the standard battery pieces (10) for being used for an external circuit, so that a plurality of standard battery pieces (10) are connected in series and in parallel to form an NxM standard battery piece module, N represents the number of parallel connection columns, and M represents the number of serial connection rows.
4. The method for preparing a crystalline silicon-based solar power module as defined in claim 3, wherein the connecting strip (20) is a copper-based tin-plated strip or a composite metal strip and is obtained by pre-forming or on-line forming.
5. The preparation method of the crystalline silicon-based solar power generation assembly as defined in claim 3, wherein the welding manner in the steps 2) -4) is any one of infrared heating, laser heating, conductive adhesive bonding and conductive resin bonding.
6. The solar power generation assembly based on crystalline silicon is characterized by comprising a split cell piece (11) which is split equally along the direction perpendicular to a silver wire by a standard cell piece (10), a Z-shaped connecting belt (20) which is used for connecting the split cell piece (11) and has conductive performance, and a straight thickening converging belt which is arranged at the output ends of two ends of the split cell piece (11);
the connecting belt (20) is provided with two plate-shaped straight parts (21), the two straight parts (21) are integrally connected through a middle vertical part (22) to form a right-angle Z shape, and the depth of a right angle formed by the straight parts (21) and the vertical part (22) along the direction of the vertical part (22) is similar to the thickness of the battery piece (11);
the lower surface of the first battery piece (11) is welded to the lower side of the connecting belt (20), the upper surface of the straight part (21) enables silver wires collecting battery current to be perpendicular to the length direction of the connecting belt (20), the upper surface of the second battery piece (11) is welded to the upper side of the connecting belt (20), the lower surface of the straight part (21) enables the silver wires collecting battery current to be perpendicular to the length direction of the connecting belt (20), the lower surface of the second battery piece (11) and the third battery piece (11) are spliced by the other connecting belt (20), and by analogy, the right-angle Z type connecting belt (20) is adopted to serially connect the plurality of battery pieces (11) after cutting into strings;
a plurality of the split battery pieces (11) are welded on the connecting belt (20) in parallel along the length direction of the connecting belt (20) to form parallel connection of a plurality of strings of the split battery pieces (11) so as to form an NxM split battery piece module, wherein N represents the number of parallel columns, and M represents the number of series rows;
the two straight thickened bus bars are respectively arranged at the output ends of the two ends in parallel along the direction perpendicular to the series connection and are connected to Z-shaped connecting bands (20) at the two ends of the split battery pieces (11) which are connected in series for being used for an external circuit.
7. A crystalline silicon-based solar power module according to claim 6, characterized in that the length of the connecting strip (20) is at least greater than or equal to the length of the two divided battery pieces (11) in the direction perpendicular to the silver wires, the thickness of the strip of the connecting strip (20) is 0.01-0.5 mm, and the width of the strip of the connecting strip (20) is 0.2-5 mm; straight portion (21) of connecting band (20) is followed with the right angle that vertical part (22) formed cut battery piece (11) parallel direction length is 0.1 ~ 2.5mm, follows cut battery piece (11) vertical direction degree of depth be 0.05 ~ 0.2mm and with the thickness of cutting battery piece (11) is close.
8. A method for preparing a crystalline silicon-based solar power module according to claim 6 or 7, characterized by comprising the steps of:
1) firstly, obtaining a crystalline silicon solar standard cell, respectively designing a positive electrode and a negative electrode on the upper surface and the lower surface of the silicon wafer, and forming a plurality of silver leads for collecting conductive particles and leading out current in a screen printing mode; meanwhile, a Z-shaped connecting belt (20) with a corresponding length is designed according to the length of the standard battery piece to be connected in parallel;
2) dividing and cutting the standard battery piece into equal parts: before manufacturing the battery piece assembly, equally cutting the standard battery piece in a mode of laser processing perpendicular to the direction of the silver wire according to requirements;
3) the battery pieces (11) are connected in parallel:
firstly, welding the lower surface of a first piece of the divided battery piece (11) to the upper surface of the flat part (21) at the lower side of the first connecting belt (20) and enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt (20), and then welding a plurality of pieces of the divided battery pieces (11) on the connecting belt (20) in parallel end to end along the length direction of the connecting belt (20) to form parallel connection of a plurality of strings of the divided battery pieces (11);
4) series connection of the divided cell pieces (11):
based on the parallel connection, welding the upper surface of the second group of the parallel-connected divided battery pieces (11) to the lower surface of the straight part (21) on the upper side of the first connecting belt (20) and enabling silver wires for collecting battery current to be vertical to the length direction of the connecting belt (20), and then splicing the lower surface of the second group of the parallel-connected divided battery pieces (11) adopting the step 3) and the third group of the parallel-connected divided battery pieces (11) adopting the step 3) in series by using the other connecting belt (20);
5) and (3) forming a module of the split battery piece (11): based on steps 3) and 4), analogizing in turn, two the straight thickening confluence belt is respectively along series connection direction parallel arrangement at both ends output on the battery piece (11) of cutting and part protrusion battery piece (11) are used for external circuit, thereby the multi-disc battery piece (11) of cutting is connected in series and parallel in order to form the battery piece module of cutting of NxM, and N stands for parallelly connected column number, and M stands for the line number of establishing ties.
9. The method for preparing a crystalline silicon-based solar power module as defined in claim 8, wherein the connecting strip (20) is a copper-based tin-plated strip or a composite metal strip and is obtained by pre-forming or on-line forming.
10. The method for preparing a crystalline silicon-based solar power generation assembly as defined in claim 8, wherein the welding manner in steps 3) -5) is any one of infrared heating, laser heating, conductive adhesive bonding and conductive resin bonding.
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