CN115347057A - Photovoltaic module - Google Patents
Photovoltaic module Download PDFInfo
- Publication number
- CN115347057A CN115347057A CN202110459364.6A CN202110459364A CN115347057A CN 115347057 A CN115347057 A CN 115347057A CN 202110459364 A CN202110459364 A CN 202110459364A CN 115347057 A CN115347057 A CN 115347057A
- Authority
- CN
- China
- Prior art keywords
- photovoltaic module
- grid lines
- front side
- secondary grid
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 claims abstract description 108
- 229910052751 metal Inorganic materials 0.000 claims abstract description 108
- 210000005056 cell body Anatomy 0.000 claims description 63
- 210000004027 cell Anatomy 0.000 claims description 55
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 53
- 229910052802 copper Inorganic materials 0.000 claims description 49
- 239000010949 copper Substances 0.000 claims description 49
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 31
- 229910052709 silver Inorganic materials 0.000 claims description 31
- 239000004332 silver Substances 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 20
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical group [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 22
- 229910021417 amorphous silicon Inorganic materials 0.000 description 22
- 239000002313 adhesive film Substances 0.000 description 16
- 229920000642 polymer Polymers 0.000 description 12
- 229910052759 nickel Inorganic materials 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000000758 substrate Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 229910003437 indium oxide Inorganic materials 0.000 description 6
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 6
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 6
- 229910001887 tin oxide Inorganic materials 0.000 description 6
- 230000003064 anti-oxidating effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910021424 microcrystalline silicon Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229920005573 silicon-containing polymer Polymers 0.000 description 3
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- YFKIWUQBRSMPMZ-UHFFFAOYSA-N methane;nickel Chemical compound C.[Ni] YFKIWUQBRSMPMZ-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910018540 Si C Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000008645 cold stress Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- -1 gallium arsenide Chemical class 0.000 description 1
- 230000008642 heat stress Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000005571 horizontal transmission Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001558 organosilicon polymer Polymers 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Sustainable Energy (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a photovoltaic module, which comprises: the solar cell comprises a plurality of cell pieces, a plurality of grid lines and a plurality of grid lines, wherein each cell piece comprises a cell piece body and a plurality of grid lines, the grid lines are arranged on at least one side surface of the cell piece body at intervals along a first direction, each grid line extends along a second direction perpendicular to the first direction, and at least one grid line comprises a metal wire and a metal part for connecting the metal wire and the cell piece body; and the two adjacent battery plates are electrically connected through the plurality of interconnection structural members, one end of each interconnection structural member is connected to the front side of one of the two adjacent battery plates, and the other end of each interconnection structural member is connected to the back side of the other of the two adjacent battery plates. According to the photovoltaic module, more secondary grid lines can be arranged, and the resistance of the cell in the first direction can be greatly reduced, so that the output power of the cell can be improved, and the output power of the photovoltaic module can be further improved.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to a photovoltaic module.
Background
With the development of photovoltaic technology, the power requirements of users on photovoltaic modules are higher and higher.
In the related art, in order to meet the power requirement of users on the photovoltaic module, the grid lines of the cell pieces are usually printed by silver paste. However, the size of the silver paste grid lines is large, so that the number of the grid lines arranged on the battery piece is small, and the resistance of the silver paste is large, thereby affecting the output power of the battery piece. In addition, the cost of silver thick liquid is higher, and this just causes photovoltaic module's cost too high to can influence the competitiveness of above-mentioned photovoltaic module on market.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a photovoltaic module, which can greatly reduce the resistance of the cell and increase the output power of the photovoltaic module.
According to the embodiment of the invention, the battery piece comprises: the battery piece comprises a battery piece body and a plurality of secondary grid lines, the secondary grid lines are arranged on at least one side surface of the battery piece body at intervals along a first direction, each secondary grid line extends along a second direction perpendicular to the first direction, and at least one secondary grid line comprises a metal wire and a metal part connected between the metal wire and the battery piece body; the battery pack comprises a plurality of battery sheets, a plurality of interconnection structural members, a plurality of battery sheets and a plurality of battery units, wherein the battery sheets are electrically connected with each other through the interconnection structural members, one end of each interconnection structural member is connected to the front side of one of the two adjacent battery sheets, and the other end of each interconnection structural member is connected to the back side of the other of the two adjacent battery sheets.
According to the photovoltaic module provided by the embodiment of the invention, at least one of the plurality of secondary grid lines of each cell is set to comprise the metal wire and the metal part, so that more secondary grid lines can be arranged, the resistance of the cell in the first direction can be greatly reduced, the output power of the cell can be improved, and the output power of the photovoltaic module can be improved.
According to some embodiments of the invention, the wire comprises: a copper body; an oxidation resistant layer covering at least a portion of a surface of the copper body.
According to some embodiments of the invention, the copper body is a copper wire.
According to some embodiments of the invention, the oxidation resistant layer is at least one of a metal layer and an alloy layer.
According to some embodiments of the invention, when at least part of the surface of the copper body is covered with the metal layer, the metal layer is a tin layer or a silver layer.
According to some embodiments of the invention, the weight proportion of the antioxidation layer in the metal wire is W, wherein W satisfies: w is more than or equal to 0% and less than or equal to 5%.
According to some embodiments of the invention, the metal portion is a single metal layer or a plurality of metal layers, adjacent two of the plurality of metal layers being different in composition.
According to some embodiments of the invention, the cross-sectional shape of the wire is circular, elliptical, oblong or polygonal.
According to some embodiments of the invention, when the cross-sectional shape of the wire is circular, the wire has a diameter D, wherein D satisfies: d is more than or equal to 10 mu m and less than or equal to 50 mu m.
According to some embodiments of the invention, when the cross-sectional shape of the wire is trapezoidal or triangular, the maximum width of the wire is W 1 The height of the metal wire is H 1 Wherein, the W 1 、H 1 Respectively satisfy: w is less than or equal to 10 mu m 1 ≤50μm，10μm≤H 1 ≤25μm。
According to some embodiments of the invention, each of the sub-gate lines has a height H 2 Wherein, the H 2 Satisfies the following conditions: h is less than or equal to 11 mu m 2 ≤53μm。
According to some embodiments of the invention, the plurality of finger lines comprises: the plurality of front side secondary grid lines are arranged on the front side of the battery piece body, the plurality of front side secondary grid lines are spaced from each other along the first direction, and each front side secondary grid line extends along the second direction; the plurality of back side secondary grid lines are arranged on the back side of the battery piece body, the plurality of back side secondary grid lines are spaced from each other along the first direction, and each back side secondary grid line extends along the second direction.
According to some embodiments of the invention, the ratio of the sum of the areas of all the front side secondary grid lines shielding the front side of the cell body to the area of the front side of the cell body is λ 1 Wherein, said λ 1 Satisfies the following conditions: lambda is more than or equal to 0.3% 1 ≤3.2％。
According to some embodiments of the invention, a distance between two adjacent front side secondary grid lines is L 1 Wherein, said L 1 Satisfies the following conditions: l is not more than 0.7mm 1 ≤3.1mm。
According to some embodiments of the invention, the ratio of the sum of the areas of all the back secondary grid lines shielding the back surface of the cell body to the area of the back surface of the cell body is λ 2 Wherein, said λ 2 Satisfies the following conditions: lambda is more than or equal to 0.6% 2 ≤6.4％。
According to some embodiments of the invention, a distance between two adjacent back side sub-grid lines is L 2 Wherein, said L 2 Satisfies the following conditions: l is not less than 0.35mm 1 ≤1.55mm。
According to some embodiments of the invention, the sum of the areas of all the back side secondary grid lines shielding the back side of the cell body is greater than or equal to the sum of the areas of all the front side secondary grid lines shielding the front side of the cell body.
According to some embodiments of the invention, the number of the back side sub-grid lines is equal to or greater than the number of the front side sub-grid lines.
According to some embodiments of the invention, the number of the front side secondary grid lines is N 1 The number of the back side secondary grid lines is N 2 Wherein, the N is 1 、N 2 Respectively satisfy: 80 is less than or equal to N 1 ≤240，120≤N 2 ≤480。
According to some embodiments of the invention, when the battery piece is half of a complete battery piece, the number of the front side secondary grid lines is N 3 The number of the back side secondary grid lines is N 4 Wherein, the N is 3 、N 4 Respectively satisfy: n is more than or equal to 40 3 ≤120，60≤N 4 ≤240。
According to some embodiments of the invention, the N is 3 Further satisfies the following conditions: 80 is less than or equal to N 3 Less than or equal to 120. According to some embodiments of the invention, the battery piece further comprises: the plurality of main grid lines are arranged on the surface of the battery piece body along the second direction at intervals, and each main grid line extends along the first direction.
According to some embodiments of the present invention, a material of at least one of the main gate lines is different from a material of at least one of the sub gate lines.
According to some embodiments of the invention, at least one of the main gate lines is a silver paste main gate line.
According to some embodiments of the invention, the number of the main gate lines is N 5 Wherein, the N is 5 Satisfies the following conditions: n is not less than 7 5 ≤20。
According to some embodiments of the invention, each of the bus bars has a width W 2 Each main grid line has a height H 3 Wherein, the W 2 、H 3 Respectively satisfy: w is not less than 0.05mm 2 ≤0.2mm，8μm≤H 3 ≤22μm。
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a battery cell according to an embodiment of the invention;
fig. 2 is a partial cross-sectional view of a battery piece according to an embodiment of the invention along a first direction;
fig. 3 is a partial cross-sectional view of a battery cell according to an embodiment of the present invention along a second direction;
fig. 4 is a partial cross-sectional view of a battery cell according to another embodiment of the present invention, taken along a second direction.
Reference numerals:
100: a battery piece;
1: a cell body; 11: an n-type single crystal substrate; 12: the first a-Si is H layer;
13: n + doped a-Si is H layer; 14: a first TCO layer; 15: a second a-Si layer of H;
16: p + doped a-Si is H layer; 17: a second TCO layer; 2: a secondary gate line;
21: a copper body; 22: a metal part; 3: the main grid line.
Detailed Description
A photovoltaic module (not shown) according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
As shown in fig. 1 to 4, a photovoltaic module according to an embodiment of the present invention includes a plurality of battery sheets 100 and a plurality of interconnection structures (not shown). In the description of the present invention, "a plurality" means two or more.
Specifically, each battery sheet 100 includes a battery sheet body 1 and a plurality of finger lines 2, the plurality of finger lines 2 being provided on at least one side surface of the battery sheet body 1 to be spaced apart from each other in a first direction (e.g., an up-down direction in fig. 1), and each finger line 2 extending in a second direction (e.g., a left-right direction in fig. 1) perpendicular to the first direction. For example, in the example of fig. 1, 3 and 4, the battery piece 100 may be substantially rectangular, the plurality of finger lines 2 may each extend in the left-right direction and be uniformly spaced in the up-down direction, and the plurality of finger lines 2 may each be parallel to the upper side and the lower side of the battery piece body 1. Two adjacent battery pieces 100 are electrically connected through a plurality of interconnection structural members, one end of each interconnection structural member is connected to the front side of one of the two adjacent battery pieces 100, and the other end of each interconnection structural member is connected to the back side of the other of the two adjacent battery pieces 100, so that the plurality of battery pieces 100 are connected in series to form a battery string. Therefore, when the photovoltaic module works, the plurality of secondary grid lines 2 can guide out the current generated by the corresponding cell slice body 1 through the photovoltaic effect, and then the current on the plurality of secondary grid lines 2 is collected and summarized through a plurality of interconnection structural members such as solder strips.
At least one of the sub-grid lines 2 includes a metal wire and a metal part 22 connecting the metal wire and the cell body 1. Therefore, compare with traditional battery piece printing silver thick liquid grid line, through setting to including wire and metal part 22 with at least one vice grid line 2 in a plurality of vice grid lines 2, make this vice grid line 2 can independently process, thereby can process into the vice grid line 2 that cross sectional dimension is littleer relatively with vice grid line 2, can reduce the sheltering from to battery piece 100, and when battery piece 100 has the same area of sheltering from, can set up more vice grid lines 2, can reduce the distance between two adjacent vice grid lines 2 like this, and then can reduce battery piece 100 at the resistance of first direction (be horizontal transmission resistance), metal part 22 can be effectively with on the electric current transmission to the wire that battery piece body 1 produced simultaneously, the output of battery piece 100 has been improved, and then can improve photovoltaic module's output.
All the secondary grid lines 2 may include metal wires and metal portions 22, at this time, the number of the secondary grid lines 2 may be further increased, and the distance between two adjacent secondary grid lines 2 may be further reduced, so that the resistance of the battery piece 100 in the first direction may be greatly reduced, and the battery piece 100 has higher output power; alternatively, a part (i.e., any one or any ones) of the plurality of finger lines 2 may include the metal wire and the metal part 22, and another part of the plurality of finger lines 2 may be another type of finger line 2, for example, the another part of the plurality of finger lines 2 may be a silver paste finger line. Thus, the battery sheet 100 may also have a higher output power.
According to the photovoltaic module of the embodiment of the invention, at least one of the plurality of the minor grid lines 2 of each cell 100 is set to include the metal wire and the metal part 22, so that more minor grid lines 2 can be set, the resistance of the cell 100 in the first direction can be greatly reduced, the output power of the cell 100 can be improved, and the output power of the photovoltaic module can be improved.
According to some embodiments of the invention, the wire comprises a copper body 21 and an oxidation resistant layer (not shown). In comparison with the conventional finger gate line,on the one hand, the resistivity of the copper body 21 is smaller than that of silver paste, and the value range of the resistivity of the copper body 21 is generally 1.7 × 10 -8 Omega m (ohm m) to 1.8X 10 -8 Ω · m (inclusive), wherein the resistivity of the copper body 21 is 1.75 × 10 at a temperature of 20 ℃ -8 Ω · m, the resistance of the battery piece 100 in the first direction can be further reduced, and the output of the battery piece 100 can be further improved; on the other hand, the ductility of copper main part 21 is less than the silver thick liquid, can effectively avoid vice grid line 2 to take place disconnected bars problem. In addition, the metal wire comprises a copper main body 21, and the secondary grid lines 2 can be set to be small-sized secondary grid lines 2, so that the shielding of the secondary grid lines 2 on the cell body 1 can be reduced, and the number of the secondary grid lines 2 can be increased.
Alternatively, the copper body 21 may be a copper wire. In addition, copper main part 21 is the copper wire, because the processing mode of copper wire is simple, can further reduce the cost of battery piece 100, and then can further reduce photovoltaic module's cost. But is not limited thereto.
An oxidation resistant layer covers at least part of the surface of the copper body 21. So set up, the antioxidation layer can play the guard action to copper main part 21, and copper main part 21 is difficult for the oxidation to the life of battery piece 100 has been prolonged. For example, in the example of fig. 3 and 4, a part of the copper main body 21 of each sub-grid line 2 is exposed outside the metal part 22, and an oxidation resistant layer may be disposed at the exposed part of the copper main body 21 to isolate the exposed part of the copper main body 21 from the outside, so as to prevent the exposed part of the copper main body 21 from being oxidized, and thus, the service life of the battery piece 100 may be effectively prolonged. Of course, the present invention is not limited thereto, and the oxidation-resistant layer may cover the entire outer circumferential surface of the copper body 21 to protect the entire outer surface of the copper body 21.
In some alternative embodiments, as shown in fig. 3, the metal part 22 of each minor grid line 2 is connected to one side surface of the cell body 1, and a part of the metal wire of each minor grid line 2 may be embedded in the metal part 22, so that the contact area between the metal wire and the metal part 22 may be increased, and the connection strength of the metal wire may be improved. Alternatively, as shown in fig. 4, the metal part 22 of each minor grid line 2 is embedded in the cell body 1, and a part of the metal wire of each minor grid line 2 is embedded in the metal part 22, whereby the connection strength of the metal wire can be further improved.
Optionally, the oxidation resistant layer is at least one of a metal layer or an alloy layer. Wherein at least a part of the surface of the copper main body 21 of the at least one finger 2 may be covered with only a metal layer; alternatively, at least a part of the surface of the copper body 21 of the at least one finger 2 may be covered with only an alloy layer; still alternatively, at least a part of the surface of the copper main body 21 of the at least one finger 2 may be covered with the metal layer and the alloy layer at the same time, optionally, the metal layer and the alloy layer may be respectively covered at different positions of the copper main body 21, or both the metal layer and the alloy layer may be located at the same position of the copper main body 21, and at this time, the metal layer may be covered on the alloy layer, or the alloy layer may be covered on the metal layer. For example, a metal or alloy layer may be plated on the outer surface of the copper body 21. Therefore, the metal layer or the alloy layer can protect the copper main body 21, prevent the copper main body 21 from being oxidized, and ensure good conductivity of the copper main body 21.
Alternatively, when at least part of the surface of the copper body 21 is covered with a metal layer, the metal layer may be a tin layer or a silver layer. When at least a part of the surface of the copper body 21 is covered with the alloy layer, the alloy layer may be a silver alloy. But is not limited thereto.
In some optional embodiments, the weight ratio of the oxidation resistant layer in the wire is W, wherein W satisfies: w is more than or equal to 0% and less than or equal to 5%. When W is greater than 5%, the thickness of the antioxidation layer is thicker, which may increase the resistance of the sub-grid line 2, and affect the output power of the cell 100. From this, when W satisfied 0% and be less than or equal to W and be less than or equal to 5%, the thickness of antioxidation layer is comparatively reasonable, both can separate copper main part 21 with the external world, avoids vice grid line 2 to take place the oxidation, prolongs battery piece 100's life, can guarantee battery piece 100's output again effectively. When W =0%, the surface of the copper main body 21 is not covered with the anti-oxidation layer, and the cell 100 is encapsulated between the front adhesive film layer and the back adhesive film layer of the photovoltaic module, so that the cell 100 can be effectively isolated from the outside. Therefore, the service life of the battery piece 100 can be ensured, the resistance of the secondary grid line 2 can be further reduced, and the output power of the battery piece 100 is improved.
In some alternative embodiments, the metal portion 22 may be a single metal layer. For example, the single metal layer may be a silver layer or a metal layer containing silver particles, and the subgrid 2 may have better conductivity while ensuring reliable connection between the metal wire and the cell body 1.
In other alternative embodiments, the metal portion 22 may also be a plurality of metal layers, and adjacent two of the plurality of metal layers have different compositions. For example, a plurality of metal layers may be plated on the cell body 1 by electroplating. Specifically, when the metal portion 22 is two metal layers, a basic plating layer, such as a nickel layer, may be first formed on the cell body 1 to make the cell body 1 have platability, and then another metal layer, such as a silver layer or a copper layer, may be formed on the basic plating layer of the cell body 1, where the two metal layers are a nickel layer plus a silver layer and a nickel layer plus a copper layer. Therefore, the reliable connection between the auxiliary grid line 2 and the battery piece body 1 can be ensured, and the current generated by the battery piece body 1 can be directly transmitted to the auxiliary grid line 2. Of course, the metal portion 22 may be three or more metal layers.
Of course, the present invention is not limited thereto, and the metal part 22 may further include a polymer and conductive particles, and the polymer may include at least one of a silicone polymer and an epoxy polymer. Wherein the polymer may include only one of a silicone polymer and an epoxy polymer; alternatively, the polymer may include both silicone polymers and epoxy polymers. Organosilicon polymers are polymers which contain Si-C bonds and at least one organic radical which is bonded directly to a silicon atom. Epoxy polymers are polymers in which oxygen atoms are added to the middle of the carbon chain. For example, the polymer may be silicone or ethylene oxide. The conductive particles include at least one of nickel, nickel-on-carbon, silver-on-copper, and silver. The conductive particles can be made of any one of nickel, nickel-coated carbon, silver-coated copper and silver; alternatively, the conductive particles may be composed of any two of nickel, nickel-coated carbon, silver-coated copper, and silver; or, the conductive particles may be composed of any three of nickel, nickel-coated carbon, silver-coated copper, and silver; alternatively, the conductive particles may be nickel, consist of nickel-on-carbon, silver-on-copper, and silver. Therefore, while the secondary grid lines 2 are reliably connected with the cell body 1, the current generated by the cell body 1 can be transmitted to the copper main body 21 through the conductive particles of the metal part 22, and then the current on the plurality of secondary grid lines 2 is collected and collected through a plurality of interconnection structural members such as solder strips.
Alternatively, when the metal part 22 includes a polymer and conductive particles, the metal part 22 may be printed or sprayed on a corresponding metal wire, and then the metal wire with the metal part 22 is placed on the battery cell body 1 for drying and curing to connect the metal wire to the battery cell body 1. Therefore, the reliable connection between the secondary grid lines 2 and the cell body 1 can be further ensured, and the current generated by the cell body 1 can be transmitted to the corresponding metal wires of the secondary grid lines 2 through the metal parts 22. Here, it should be noted that "printing" may be understood as directly painting the metal portion 22 onto the metal wire of the corresponding finger 2.
In some alternative embodiments, the cross-sectional shape of the wire is circular (as shown in fig. 3 and 4), elliptical (not shown), oblong (not shown), or polygonal (not shown). For example, the polygon may be a triangle, a trapezoid, or the like. Thus, when the cross-sectional shape of the wire is circular, elliptical or oblong, the wire can be smoothly inserted into the metal part 22 because the outer surface of the wire is a smooth curved surface; when the cross-sectional shape of the wire is a polygon, the contact area of the wire with the metal part 22 can be increased, so that the wire can be reliably attached to the metal part 22. Here, it should be noted that the oblong circle is substantially a runway shape, and specifically, the oblong circle may include two straight line segments and two arc line segments, the two straight line segments are parallel to each other, and two ends of the two straight line segments are respectively connected by the two arc line segments.
In some alternative embodiments, when the cross-sectional shape of the wire is circular, the wire has a diameter D, wherein D satisfies: d is more than or equal to 10 mu m and less than or equal to 50 mu m. When D is less than 10 micrometers, the diameter of the metal wire of each secondary grid line 2 is too small, so that the transmission resistance of the secondary grid line 2 is increased, and the current on the cell body 1 cannot be effectively guided, so that the output power of the photovoltaic module is influenced; when D is greater than 50 μm, the diameter of the metal wire of each secondary grid line 2 is too large, which may cause too large shielding area for the cell body 1, thereby also affecting the output power of the photovoltaic module. Therefore, when D is larger than or equal to 10 microns and smaller than or equal to 50 microns, the auxiliary grid lines 2 can effectively guide the current generated by the cell body 1, the shielding of the cell body 1 can be reduced, and the output power of the photovoltaic module is improved.
In other alternative embodiments, when the cross-sectional shape of the wire is trapezoidal or triangular, the maximum width of the wire is W 1 The height of the wire is H 1 Wherein W is 1 、H 1 Respectively satisfy: w is less than or equal to 10 mu m 1 ≤50μm，10μm≤H 1 Less than or equal to 25 mu m. When W is 1 When the width of the metal wire is smaller than 10 micrometers, the transmission resistance of the auxiliary grid line 2 is increased due to too small width of the metal wire, and the current on the cell body 1 cannot be effectively guided, so that the output power of the photovoltaic module is influenced; when W is 1 The width of the metal wire is too large at more than 50 μm, and the power of the photovoltaic module is reduced along with the increase of the width of the metal wire, so that the shielding area of the cell body 1 is possibly too large, and the output power of the photovoltaic module is affected.
Similarly, when H 1 When the thickness is less than 10 micrometers, the height of the metal wire is too small, so that the transmission resistance of the auxiliary grid line 2 can be increased, and the current on the cell body 1 can not be effectively guided, so that the output power of the photovoltaic module can be further reduced; when H is present 1 When the thickness is larger than 25 μm, the height of the metal wire is too large, and the use amount of the material for manufacturing the secondary grid line 2 is too large due to the too large height of the copper main body 21, so that the cost of the cell 100 is increased, and the thickness of the photovoltaic module is increased. Wherein "the height of the wire" refers to the maximum height of the wire in the third direction (e.g., up and down direction in fig. 3).
Thereby, by making W 1 、H 1 Respectively satisfy: w is less than or equal to 10 mu m 1 ≤50μm，10μm≤H 1 Less than or equal to 25 mu m, the secondary grid line 2 can reduce the current generated by the cell body 1 while effectively guiding the currentThe shielding of the cell body 1 improves the output power of the photovoltaic module, and the cost is lower.
In some alternative embodiments, as shown in fig. 3 and 4, each finger 2 has a height H 2 Wherein H is 2 Satisfies the following conditions: h is not less than 11 mu m 2 Less than or equal to 53 mu m. When H is present 2 When the height of each secondary grid line 2 is smaller than 11 micrometers, the transmission resistance of the secondary grid line 2 may be increased, and the current on the battery piece body 1 may not be effectively guided, so that the output power of the battery piece 100 may be reduced; when H is present 2 When the height of each secondary grid line 2 is larger than 53 μm, the material consumption of the secondary grid line 2 is increased, and the cost is increased. Thereby, by making H 2 H is less than or equal to 11 mu m 2 Less than or equal to 53 mu m, the secondary grid line 2 can improve the output power of the battery piece 100 while effectively guiding the current generated by the battery piece body 1, and the cost is lower. Optionally, the height of each finger 2 ranges from 11 μm to 22 μm (inclusive), but is not limited thereto.
According to some embodiments of the present invention, the plurality of minor grid lines 2 includes a plurality of front minor grid lines and a plurality of back minor grid lines, the plurality of front minor grid lines are all disposed on the front surface of the cell body 1, the plurality of front minor grid lines are spaced apart from each other along the first direction, and each front minor grid line extends along the second direction. A plurality of back side finger lines are all provided at the back of the cell body 1, the plurality of back side finger lines are spaced apart from each other along the first direction, and each back side finger line extends along the second direction. Therefore, the front side secondary grid lines can guide out the current generated by the photovoltaic effect on the front side of the battery piece body 1, and the back side secondary grid lines can guide out the current generated by the photovoltaic effect on the back side of the battery piece body 1.
Optionally, the ratio of the sum of the areas of all the front side secondary grid lines shielding the front side of the cell body 1 to the area of the front side of the cell body 1 is λ 1 Wherein λ is 1 Satisfies the following conditions: lambda is more than or equal to 0.3% 1 Less than or equal to 3.2 percent. When lambda is 1 When the area of the front side secondary grid lines is less than 0.3%, the area of the front side of the battery piece body 1, which is sheltered by all the front side secondary grid lines, is smaller, the number of the front side secondary grid lines arranged on the front side of the battery piece body 1 is possibly smaller, and therefore the front side secondary grid lines are adjacent to each otherThe distance between the two front side secondary grid lines is larger, so that the resistance of the battery piece 100 in the first direction is increased, and the output power of the battery piece 100 is reduced; when lambda is 1 When the area is larger than 3.2%, the area of the front side of the cell body 1, which is shielded by all the front side sub-grid lines, is large, and the photoelectric conversion efficiency of the cell 100 is affected. Thus, when λ is 1 Satisfies the condition that the lambda is more than or equal to 0.3 percent 1 When less than or equal to 3.2%, the resistance of the battery piece 100 in the first direction can be reduced, the photoelectric conversion efficiency of the battery piece 100 can be ensured, and the output current and the output power of the battery piece 100 are increased. Here, the term "the sum of the areas of all the front side sub-grid lines that block the front side of the cell main body 1" refers to the sum of the areas of the front projections of all the front side sub-grid lines projected on the front side of the cell main body 1 when the incident light is perpendicularly irradiated on the front side of the cell 100.
Furthermore, the distance between two adjacent front side secondary grid lines is L 1 Wherein L is 1 Satisfies the following conditions: l is not more than 0.7mm 1 Less than or equal to 3.1mm. When L is 1 When the distance between every two adjacent front side secondary grid lines is smaller than 0.7mm, the number of the front side secondary grid lines arranged on the front side of the cell body 1 is larger, so that the area of the front side secondary grid lines shielding the front side of the cell body 1 is too large, and the photoelectric conversion efficiency of the cell 100 is influenced; when L is 1 If the distance between two adjacent front side finger lines is too large, the resistance of the battery piece 100 in the first direction may be increased, and the output power of the battery piece 100 may be affected when the distance between two adjacent front side finger lines is too large. Thus, when L is 1 L is more than or equal to 0.7mm 1 When the thickness of the battery piece 100 is less than or equal to 3.1mm, the resistance of the battery piece 100 in the first direction can be reduced, and the photoelectric conversion efficiency and the output power of the battery piece 100 can be ensured.
Optionally, the ratio of the sum of the areas of all the back secondary grid lines shielding the back of the cell body 1 to the area of the back of the cell body 1 is λ 2 Wherein λ is 2 Satisfies the following conditions: lambda is more than or equal to 0.6% 2 Less than or equal to 6.4 percent. When lambda is 2 When the current is less than 0.6%, the number of back side secondary grid lines positioned on the back side of the battery piece body 1 may be less, and the distance between two adjacent back side secondary grid lines is larger, so that the current on the back side of the battery piece body 1 is enabled to be largerIt is not transmitted to the back sub-grid as much as possible, thereby reducing the output power of the battery cell 100; when lambda is 2 If the area is greater than 6.4%, the area of all the back secondary grid lines, which blocks the back of the cell body 1, is large, which may affect the photoelectric conversion efficiency of the cell 100. Thus, when λ is 2 Satisfies the lambda of more than or equal to 0.6 percent 2 When the current is less than or equal to 6.4%, the photoelectric conversion efficiency and the output power of the battery piece 100 can be ensured, and the current on the back surface of the battery piece body 1 can be transmitted to the back surface auxiliary grid line as much as possible. Here, the "sum of the areas of all the back side sub-grid lines that block the back side of the cell body 1" refers to the sum of the areas of the orthographic projections of all the back side sub-grid lines projected on the back side of the cell body 1 when the incident light is vertically irradiated on the back side of the cell 100.
Further, the distance between two adjacent back side sub-grid lines is L 2 Wherein L is 2 Satisfies the following conditions: l is not less than 0.35mm 1 Less than or equal to 1.55mm. When L is 2 When the distance between two adjacent back side secondary grid lines is too small, the number of the back side secondary grid lines arranged on the back side of the cell body 1 is large, the area of the back side secondary grid lines shielding the back side of the cell body 1 is too large, and the photoelectric conversion efficiency of the cell 100 is influenced; when L is 2 If the distance between two adjacent back side finger lines is too large, the resistance of the battery piece 100 in the first direction may be increased, and the output power of the battery piece 100 may be affected when the distance between two adjacent back side finger lines is too large. Thus, when L is 2 L is more than or equal to 0.35mm 2 When the thickness is less than or equal to 1.55mm, the resistance of the cell piece 100 in the first direction can be reduced, and the photoelectric conversion efficiency and the output power of the cell piece 100 can be ensured.
In some optional embodiments, the sum of the areas of the back side of the cell body 1 covered by all the back side sub-grid lines is greater than or equal to the sum of the areas of the front side of the cell body 1 covered by all the front side sub-grid lines, so that the area of the front side of the cell body 1 covered by the plurality of front side sub-grid lines can be reduced, and the front side of the cell body 1 is a main light receiving surface, so that the light receiving area of the front side of the cell body 1 can be increased, and the output power of the photovoltaic module can be further improved.
Furthermore, the number of the back side auxiliary grid lines is larger than or equal to that of the front side auxiliary grid lines, so that the shielding area of the plurality of front side auxiliary grid lines on the front side of the cell can be further reduced, and the output power of the photovoltaic module can be further improved.
In some alternative embodiments, the number of front side subgrid lines is N 1 The number of back side secondary grid lines is N 2 Wherein N is 1 、N 2 Respectively satisfy: 80 is less than or equal to N 1 ≤240，120≤N 2 Less than or equal to 480. Thus, when N is 1 、N 2 Respectively satisfy 80 and less than or equal to N 1 ≤240，120≤N 2 When 480 is equaled or less, compare with traditional battery piece, can set up more vice grid line 2 on the battery piece body 1, can reduce the resistance of battery piece 100 on the first direction, can effectively guide the electric current at the positive and the battery piece body 1 back of battery piece body 1 simultaneously, and can reduce the sheltering from to battery piece body 1 front and back, guarantee that photovoltaic module has higher output. Alternatively, the battery sheet 100 may be a complete battery sheet.
In some alternative embodiments, when the battery piece 100 is one-half of a complete battery piece, the number of the front side secondary grid lines is N 3 The number of back side secondary grid lines is N 4 Wherein N is 3 、N 4 Respectively satisfy: n is more than or equal to 40 3 ≤120，60≤N 5 Less than or equal to 240. Thereby, by making N 3 、N 4 Respectively satisfy: n is more than or equal to 40 3 ≤120，60≤N 4 Less than or equal to 240, the resistance of the cell 100 in the first direction can be reduced, and the front side secondary grid lines and the back side secondary grid lines can effectively guide the currents on the front side and the back side of the cell body 1, so that the output power of the photovoltaic module is ensured. Alternatively, the battery sheet 100 may be cut from a complete battery sheet. Therefore, compared with the adoption of a complete battery piece, the internal loss of the photovoltaic module can be reduced, the output power of the photovoltaic module can be further improved, and the single watt cost is reduced.
Further, N 3 Further satisfies the following conditions: n is more than or equal to 80 3 Less than or equal to 120. Because the secondary grid line 2 can be independently processed into the secondary grid line 2 with the smaller cross section size, the battery pieceMore secondary grid lines 2 can be arranged on the body 1, so that the resistance of the cell 100 in the first direction can be further reduced, the output power of the cell 100 is improved, and the output power of the photovoltaic module is further improved. Optionally, the length of the battery piece 100 ranges from 182mm to 210mm (inclusive), but is not limited thereto.
According to some embodiments of the present invention, the battery sheet 100 further includes a plurality of main grid lines 3, the plurality of main grid lines 3 are disposed on the surface of the battery sheet body 1 along the second direction and spaced apart from each other, and each main grid line 3 extends along the first direction. For example, in the example of fig. 1, a plurality of main grid lines 3 may each extend in the up-down direction and be uniformly spaced in the left-right direction, the plurality of main grid lines 3 may each be parallel to the left side and the right side of the cell body 1, and the plurality of main grid lines 3 may be perpendicular to the plurality of sub-grid lines 2. Therefore, by arranging the plurality of main grid lines 3, the plurality of auxiliary grid lines 2 can guide the current generated by the cell body 1 through the photovoltaic effect, and the plurality of main grid lines 3 can collect and gather the current guided by the plurality of auxiliary grid lines 2.
Optionally, the material of the at least one main grid line 3 is different from the material of the at least one sub grid line 2. Wherein, the material of a part (i.e. any one or any several) of the plurality of main grid lines 3 is different from the material of the at least one secondary grid line 2; or, the material of all the main grid lines 3 is different from the material of the at least one secondary grid line 2. For example, above-mentioned at least one main grid line 3 can silver thick liquid main grid line, because the major component of silver thick liquid is silver and resin for the silver thick liquid has good electrically conductive effect, can guarantee battery piece 100's output effectively, and the silver thick liquid has good adhesion nature simultaneously, can guarantee effectively that main grid line 3 and battery piece body 1 are connected the reliability between. In addition, since the metal wire of the at least one secondary grid line 2 is a copper wire, the output power of the battery piece 100 is ensured, and meanwhile, the material of the main grid line 3 is different from the material of the secondary grid line 2, so that the cost of the battery piece 100 can be reduced.
Or alternatively, the material of the main grid line 3 and the material of the sub-grid line 2 may also be the same. For example, the plurality of main gate lines 3 and the plurality of sub gate lines 2 may be both copper sub gate lines. With this arrangement, the cost of the battery piece 100 can be further reduced while the output power of the battery piece 100 is ensured.
In some alternative embodiments, the number of the bus bars 3 is N 5 Wherein N is 5 Satisfies the following conditions: n is not less than 7 5 Less than or equal to 20. The two side surfaces of each battery piece body 1 in the thickness direction can be provided with a plurality of main grid lines 3, and the number of the main grid lines 3 on the two sides of each battery piece body 1 in the thickness direction can be the same. Specifically, for example, when the length of each cell 100 is 182mm, the number of the bus bars 3 on both sides of each cell body 1 in the thickness direction may be 10. When the length of each battery piece 100 is 240mm, the number of the bus bars 3 on both sides of each battery piece body 1 in the thickness direction may be 12. So set up for main grid line 3 can be as much as possible on collecting the busbar of photovoltaic module with the electric current that cell body 1 produced, guarantees photovoltaic module's output.
In some alternative embodiments, each bus bar 3 has a width W 2 Each main grid line 3 has a height H 3 Wherein W is 2 、H 3 Respectively satisfy: w is not less than 0.05mm 2 ≤0.2mm，8μm≤H 3 Less than or equal to 22 mu m. For example, when W 2 When the width of each main grid line 3 is less than 0.05mm, the collection of the current of the cell 100 may be affected due to the too small width of each main grid line 3, and the welding tension between the cell 100 and an interconnection structural member such as a welding strip may be reduced, so that the current collected by the main grid lines 3 cannot be effectively conducted out, and the reliability of the photovoltaic module is reduced; when W is 2 When the width of each main grid line 3 is larger than 0.2mm, the shielding area of the cell body 1 is possibly too large, and the output power of the photovoltaic module is influenced. When H is present 3 When the thickness is less than 8 μm, the height of each main grid line 3 is too small, which may cause the resistance of the battery piece 100 to be too large, affect the current conduction, and possibly reduce the welding tension between the main grid line 3 and an interconnection structural member such as a welding strip; when H is present 3 When the height of each main grid line 3 is larger than 22 μm, the material usage amount of the main grid line 3 is increased, the cost is increased, and welding fragments of the photovoltaic module may be increased, which affects the reliability of the photovoltaic module.
Thereby, W is set 2 、H 3 Respectively satisfy: w is not less than 0.05mm 2 ≤0.2mm，8μm≤H 3 Less than or equal to 22 mu m, the main grid lines 3 can effectively collect the current generated by the cell slice body 1, and can ensure that the interconnection structural member, such as a welding strip, has larger welding tension with the cell slice 100, thereby improving the reliability of the photovoltaic module, ensuring that the photovoltaic module has higher output power, and further reducing the cost.
Alternatively, the cell 100 may be a heterojunction (a special PN junction formed by sequentially depositing two or more different semiconductor material thin films on the same substrate, the materials having different energy band gaps, and they may be a compound such as gallium arsenide, or a semiconductor alloy such as silicon-germanium). The heterojunction cell is a hybrid solar cell made of a crystalline silicon substrate and an amorphous silicon thin film. Since the heterojunction cell contains crystalline silicon and amorphous silicon, the range of the solar spectrum absorbed by the cell 100 can be increased, and the photoelectric conversion rate of the cell 100 is improved.
Of course, the battery piece 100 may also be a PERC (Passivated Emitter and reader Cell, passivated Emitter and Rear Cell technology) battery piece. Due to the fact that the medium passivation layer is attached to the back face of the PERC cell piece, photoelectric loss on the cell piece 100 can be greatly reduced, light absorption rate can be increased, composite current density of the back face of the cell piece 100 can be reduced, and cost is low.
Alternatively, the battery slice 100 may be a masterless battery slice (not shown). The front and the back of the battery without the main grid can be provided with no main grid line 3, so that the shielding of the surface of the battery body 1 can be effectively reduced, the resistance of the battery 100 can be reduced, and the output power of the battery 100 can be improved.
According to some embodiments of the present invention, referring to fig. 2 to 4, the cell piece 100 body may include an n-type single crystal substrate 11, the front surface of the n-type single crystal substrate 11 is sequentially provided with a first a-Si: H (hydrogenated amorphous silicon) layer 12, an n + doped a-Si: H layer 13 and a first TCO (transparent conductive oxide) layer 14 along a direction away from the center of the n-type single crystal substrate 11, and the back surface of the n-type single crystal substrate 11 is sequentially provided with a second a-Si: H layer 15, a p + doped a-Si: H layer 16 and a second TCO layer 17 along a direction away from the center of the n-type single crystal substrate 11. Therefore, the heterojunction battery piece is of a front-back symmetrical structure, the low-temperature silver paste is adopted, the battery piece 100 can be effectively flaked, materials can be saved, cost is reduced, and meanwhile the cold and heat stress resistance of the battery piece body 1 is improved.
The first a-Si: H layer 12 may have a thickness of 4nm to 5nm, inclusive, and the second a-Si: H layer 15 may have a thickness of 4nm to 5nm, inclusive. The n + doped a-Si: H layer 13 may have a thickness of 4nm to 5nm, inclusive, and the p + doped a-Si: H layer 16 may have a thickness of 5nm to 6nm, inclusive. The first TCO layer 14 may have a thickness of 65nm to 75nm, inclusive, and the second TCO layer 17 may have a thickness of 65nm to 75nm, inclusive.
Alternatively, the a-Si: H layers located on the front and back surfaces of the n-type single crystal substrate 11 may be both two layers, and the two a-Si: H layers may be provided as amorphous silicon layers having different hydrogen contents. The n + -doped a-Si: H layer 13 may be a triple layer, for example, the triple n + -doped a-Si: H layer 13 may be a microcrystalline silicon layer, a microcrystalline silicon oxide layer, and a highly doped microcrystalline silicon layer. The p + doped a-Si H layer 16 may be two layers, for example, two p + doped a-Si H layers 16 may be a microcrystalline silicon layer and a highly doped microcrystalline silicon. The first TCO layer 14 and the second TCO layer 17 may each be a single mixed layer of indium oxide and tin oxide, wherein the ratio of indium oxide to tin oxide is 90:10 or 97:3; of course, the first TCO layer 14 and the second TCO layer 17 may be both a two-layer mixed layer of indium oxide and tin oxide, in which one of the two-layer mixed layers of indium oxide and tin oxide has a content ratio of 90:10, the content ratio of indium oxide and tin oxide in the other layer of the two-layer mixed layer of indium oxide and tin oxide is 97:3.
according to some embodiments of the invention, the photovoltaic module further comprises a front cover plate, a back cover plate and a cell layer. The back apron is located the ascending one side of the thickness direction of front cover plate, and the battery layer is located between front cover plate and the back apron, and the battery layer includes a plurality of battery pieces 100. Specifically, the front cover plate is arranged above the battery layer, and the back cover plate is arranged below the battery layer. The photovoltaic module can be sequentially provided with a front cover plate, a front adhesive film layer, a battery layer, a back adhesive film layer and a back cover plate along the direction from the front cover plate to the back cover plate. When the photovoltaic module is manufactured, the front cover plate, the front adhesive film layer, the battery layer, the back adhesive film layer and the back cover plate are sequentially placed to complete preparation work before lamination of the photovoltaic module. And then, after the laminated five-layer structure comprising the front cover plate, the front adhesive film layer, the battery layer, the back adhesive film layer and the back cover plate is vacuumized and laminated by heating, the front adhesive film layer and the back adhesive film layer are crosslinked and cured to protect the battery layer, and finally, the firm bonding of the five-layer structure (namely the front cover plate, the front adhesive film layer, the battery layer, the back adhesive film layer and the back cover plate) is realized. Alternatively, the front cover plate may be a glass piece and the back cover plate may be a glass piece or a back plate.
The metal part 22 of the secondary grid line 2 of the cell 100 in the laminated cell layer can be embedded in the cell body 1, one part of the metal wire of the cell 100 can be embedded in the metal part 22, and the other part of the metal wire of the cell 100 can be embedded in the front side adhesive film layer or the back side adhesive film layer. Or, the metal part 22 of the secondary grid line 2 of the battery piece 100 in the laminated battery layer may be located on one side surface of the battery piece body 1, and a part of the metal wire of the battery piece 100 may be embedded in the metal part 22, in which case the secondary grid line 2 may be entirely embedded in the front side adhesive film layer or the back side adhesive film layer.
Other constructions and operations of photovoltaic modules according to embodiments of the invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (25)
1. A photovoltaic module, comprising:
the battery piece comprises a battery piece body and a plurality of secondary grid lines, the secondary grid lines are arranged on at least one side surface of the battery piece body at intervals along a first direction, each secondary grid line extends along a second direction perpendicular to the first direction, and at least one secondary grid line comprises a metal wire and a metal part connected between the metal wire and the battery piece body;
the battery comprises a plurality of battery pieces, a plurality of interconnection structural members, a plurality of battery pieces and a plurality of battery pieces, wherein the battery pieces are electrically connected with each other through the interconnection structural members, one end of each interconnection structural member is connected to the front side of one of the two adjacent battery pieces, and the other end of each interconnection structural member is connected to the back side of the other of the two adjacent battery pieces.
2. The photovoltaic module of claim 1, wherein the wire comprises:
a copper body;
an oxidation resistant layer covering at least a portion of a surface of the copper body.
3. The photovoltaic module of claim 2 wherein the copper body is a copper wire.
4. The photovoltaic module of claim 2, wherein the oxidation resistant layer is at least one of a metal layer and an alloy layer.
5. The photovoltaic module of claim 2, wherein when at least a portion of the surface of the copper body is covered with the metal layer, the metal layer is a tin layer or a silver layer.
6. The photovoltaic module of claim 2, wherein the weight ratio of the oxidation resistant layer in the wire is W, wherein W satisfies: w is more than or equal to 0% and less than or equal to 5%.
7. The photovoltaic module of claim 1, wherein the metal portion is a single metal layer or a plurality of metal layers, adjacent two of the plurality of metal layers being different in composition.
8. The photovoltaic module of claim 1, wherein the cross-sectional shape of the wire is circular, elliptical, oblong, or polygonal.
9. The photovoltaic module of claim 8, wherein the wire has a diameter D when the wire has a circular cross-sectional shape, wherein D satisfies: d is more than or equal to 10 mu m and less than or equal to 50 mu m.
10. The photovoltaic module of claim 8, wherein when the cross-sectional shape of the wire is trapezoidal or triangular, the wire has a maximum width W 1 The height of the metal wire is H 1 Wherein, the W 1 、H 1 Respectively satisfy: w is less than or equal to 10 mu m 1 ≤50μm，10μm≤H 1 ≤25μm。
11. The photovoltaic module of claim 1, wherein each of the subgrids has a height H 2 Wherein, the H 2 Satisfies the following conditions: h is not less than 11 mu m 2 ≤53μm。
12. The photovoltaic module of claim 1, wherein the plurality of secondary grid lines comprises:
the plurality of front side secondary grid lines are arranged on the front side of the battery piece body, the plurality of front side secondary grid lines are spaced from each other along the first direction, and each front side secondary grid line extends along the second direction;
the plurality of back side secondary grid lines are arranged on the back side of the battery piece body, the plurality of back side secondary grid lines are spaced from each other along the first direction, and each back side secondary grid line extends along the second direction.
13. The photovoltaic module of claim 12, wherein the ratio of the sum of the areas of all the front side secondary grid lines shading the front side of the cell body to the area of the front side of the cell body is λ 1 Wherein, said λ 1 Satisfies the following conditions: lambda is more than or equal to 0.3% 1 ≤3.2％。
14. Root of herbaceous plantsThe photovoltaic module of claim 12, wherein the distance between two adjacent front side subgrids is L 1 Wherein, said L 1 Satisfies the following conditions: l is not more than 0.7mm 1 ≤3.1mm。
15. The photovoltaic module of claim 12, wherein the ratio of the sum of the areas of all the back side finger lines that block the back side of the cell body to the area of the back side of the cell body is λ 2 Wherein, said λ 2 Satisfies the following conditions: lambda is more than or equal to 0.6 percent 2 ≤6.4％。
16. The photovoltaic module of claim 12, wherein a distance between two adjacent back side subgrids is L 2 Wherein, said L 2 Satisfies the following conditions: l is not less than 0.35mm 1 ≤1.55mm。
17. The photovoltaic module of claim 12, wherein the sum of the areas of all the back side minor grid lines covering the back side of the cell body is greater than or equal to the sum of the areas of all the front side minor grid lines covering the front side of the cell body.
18. The photovoltaic module of claim 12, wherein the number of front side subgrid lines is N 1 The number of the back side secondary grid lines is N 2 Wherein, the N is 1 、N 2 Respectively satisfy: 80 is less than or equal to N 1 ≤240，120≤N 2 ≤480。
19. The assembly according to claim 12, wherein the number of the front side secondary grid lines is N when the cell is one-half of a complete cell 3 The number of the back secondary grid lines is N 4 Wherein, the N is 3 、N 4 Respectively satisfy: n is more than or equal to 40 3 ≤120，60≤N 4 ≤240。
20. The photovoltaic module of claim 19, wherein N is 3 Further satisfies the following conditions: n is more than or equal to 80 3 ≤120。
21. The photovoltaic module of claim 1, further comprising:
the plurality of main grid lines are arranged on the surface of the battery piece body along the second direction at intervals, and each main grid line extends along the first direction.
22. The photovoltaic module of claim 21, wherein at least one of the bus bars is made of a different material than at least one of the secondary bars.
23. The photovoltaic module of claim 21, wherein at least one of the bus bars is a silver paste bus bar.
24. The photovoltaic module of claim 21, wherein the number of bus bars is N 5 Wherein, the N is 5 Satisfies the following conditions: n is not less than 7 5 ≤20。
25. The photovoltaic module of claim 21, wherein each of the bus bars has a width W 2 Each main grid line has a height H 3 Wherein, the W 2 、H 3 Respectively satisfy: w is not less than 0.05mm 2 ≤0.2mm，8μm≤H 3 ≤22μm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110459364.6A CN115347057A (en) | 2021-04-27 | 2021-04-27 | Photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110459364.6A CN115347057A (en) | 2021-04-27 | 2021-04-27 | Photovoltaic module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115347057A true CN115347057A (en) | 2022-11-15 |
Family
ID=83977952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110459364.6A Pending CN115347057A (en) | 2021-04-27 | 2021-04-27 | Photovoltaic module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115347057A (en) |
-
2021
- 2021-04-27 CN CN202110459364.6A patent/CN115347057A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5410050B2 (en) | Solar cell module | |
| CN106653912B (en) | Grid-line-free full back contact solar cell module | |
| EP2388827B1 (en) | Solar cell module | |
| US8314323B2 (en) | Solar cell module | |
| EP2525415B1 (en) | Solar cell module | |
| JP5014503B2 (en) | Solar cell and solar cell module | |
| JP2008135655A (en) | Solar battery module, manufacturing method therefor, and solar battery cell | |
| US20130306129A1 (en) | Solar cell and solar cell module | |
| CN104412394A (en) | Solar cell | |
| US9123861B2 (en) | Solar battery, manufacturing method thereof, and solar battery module | |
| KR20100102254A (en) | Solar cell and solar cell module | |
| CN215988787U (en) | Solar cell and photovoltaic module | |
| CN212676285U (en) | Photovoltaic module | |
| CN112420854A (en) | Photovoltaic module | |
| JP2010239167A (en) | Solar cell module | |
| JP2024516468A (en) | Back contact solar cell strings and methods, assemblies and systems thereof | |
| CN103681894A (en) | Solar cell module and manufacturing method thereof | |
| CN106449796B (en) | A kind of electrode for solar cell | |
| CN215644514U (en) | Composite grid line electrode of solar cell, solar cell and photovoltaic module | |
| CN214898457U (en) | Battery piece and photovoltaic module with same | |
| WO2022033322A1 (en) | Photovoltaic module | |
| CN216450653U (en) | Battery piece and photovoltaic module with same | |
| WO2012128284A1 (en) | Rear surface electrode-type solar cell, manufacturing method for rear surface electrode-type solar cell, and solar cell module | |
| JP7353272B2 (en) | Solar cell device and method for manufacturing solar cell device | |
| JP2011222822A (en) | Solar battery module and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |