CN115411126A - Photovoltaic module - Google Patents
Photovoltaic module Download PDFInfo
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- CN115411126A CN115411126A CN202110580672.4A CN202110580672A CN115411126A CN 115411126 A CN115411126 A CN 115411126A CN 202110580672 A CN202110580672 A CN 202110580672A CN 115411126 A CN115411126 A CN 115411126A
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- 238000004806 packaging method and process Methods 0.000 claims abstract description 16
- 239000002313 adhesive film Substances 0.000 claims abstract description 14
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 11
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000011295 pitch Substances 0.000 description 7
- 229910000679 solder Inorganic materials 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000008393 encapsulating agent Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a photovoltaic module, which comprises: a front cover plate; a back cover plate; the battery layer is provided with a front packaging adhesive film between the battery layer and the front cover plate, a back packaging adhesive film is arranged between the battery layer and the back cover plate, the battery layer comprises a plurality of battery strings and a cross bus bar, the battery strings are arranged along the string arrangement direction and are connected in parallel, two ends of each battery string are respectively a positive electrode leading-out end and a negative electrode leading-out end, each battery string comprises a plurality of battery pieces connected in series, the cross bus bar comprises a first bus bar and a second bus bar, the first bus bar extends along the string arrangement direction and is electrically connected with the battery strings, and the second bus bar extends along the extension direction of the battery strings and is electrically connected with the first bus bar; and a plurality of bypass diodes each connected in reverse parallel between the positive and negative terminals through the second bus bar. According to the photovoltaic module, the hot spot effect can be avoided, and the process of the photovoltaic module is simpler.
Description
Technical Field
The invention relates to the technical field of photovoltaic manufacturing, in particular to a photovoltaic module.
Background
In the related art, each cell string of the photovoltaic module generally includes two sub-cell strings, and two adjacent sub-cell strings are generally connected in parallel by a central bus bar along the extending direction of the cell string. However, this leads to the solder strips of the sub-battery strings on both sides of the central bus bar being connected to the central bus bar, which results in a complicated process and a low production efficiency of the photovoltaic module.
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 avoid the hot spot effect, and can improve the production efficiency with a simpler process.
A photovoltaic module according to an embodiment of the present invention includes: a front cover plate; the back cover plate is arranged on one side of the front cover plate in the thickness direction; the battery layer is arranged between the front cover plate and the back cover plate, a front packaging adhesive film is arranged between the battery layer and the front cover plate, a back packaging adhesive film is arranged between the battery layer and the back cover plate, the battery layer comprises a plurality of battery strings and cross bus bars, the battery strings are arranged along a string arrangement direction and are connected in parallel, two ends of the battery strings are respectively a positive leading-out end and a negative leading-out end, each battery string comprises a plurality of battery pieces which are arranged along a battery string extending direction perpendicular to the string arrangement direction and are connected in series, the cross bus bars comprise first bus bars and second bus bars, the first bus bars extend along the string arrangement direction, the first bus bars are electrically connected with the battery strings, the second bus bars extend along the battery string extending direction, and the second bus bars are electrically connected with the first bus bars; a plurality of bypass diodes connected in parallel in reverse direction between the positive and negative terminals through the second bus bar, at least one of the bypass diodes being located between the positive terminal and a junction of the second bus bar and the first bus bar, and at least one of the bypass diodes being located between the negative terminal and a junction of the second bus bar and the first bus bar.
According to the photovoltaic module provided by the embodiment of the invention, the plurality of cell strings and the cross bus bar comprising the first bus bar and the second bus bar are arranged, the plurality of cell strings are arranged along the string arrangement direction, each cell string comprises a plurality of cell pieces which are arranged along the cell string extending direction vertical to the string arrangement direction, and the plurality of bypass diodes are reversely connected in parallel between the positive electrode leading-out end and the negative electrode leading-out end through the second bus bar, so that the photovoltaic module is simpler in process procedure while the hot spot effect is effectively avoided, and the production efficiency of the photovoltaic module is effectively improved.
According to some embodiments of the invention, a plurality of the bypass diodes are respectively located at both ends of the second bus bar.
According to some embodiments of the invention, at least two bypass diodes connected in parallel are provided between the junction of the second bus bar and the first bus bar and the positive terminal; and/or at least two bypass diodes connected in parallel are arranged between the connection position of the second bus bar and the first bus bar and the negative electrode leading-out end.
According to some embodiments of the invention, at least one of the bypass diodes is located between the front cover plate and the back cover plate.
According to some embodiments of the invention, the photovoltaic module further comprises: the bypass diodes are arranged on one side, far away from the front cover plate, of the back cover plate, and the bypass diodes are arranged in the junction box.
According to some embodiments of the invention, the battery layer further comprises: a plurality of first interconnection structures electrically connected to the battery plates at both ends of the plurality of battery strings in an extension direction of the battery strings; a plurality of tip bus bars, it is a plurality of the tip bus bar is located a plurality of respectively the edge of battery cluster extending direction's both ends, every the tip bus bar is followed the cluster direction of arranging extends, every the tip bus bar is with a plurality of battery cluster first interconnect structure all links to each other so that it is a plurality of battery cluster parallel connection, every be equipped with the lead-out wire on the tip bus bar, bypass diode connects the tip of second bus bar and correspond between the lead-out wire.
According to some embodiments of the invention, the first bus bar is located on a back surface of the battery sheet in the plurality of battery strings.
According to some embodiments of the invention, at least a portion of the first bus bar is located on a back side of one of the battery sheets of the plurality of battery strings; or two sides of the first bus bar in the width direction are respectively positioned on the back surfaces of two adjacent battery sheets in the extending direction of the battery string.
According to some embodiments of the invention, at least two adjacent battery plates of each battery string are spaced apart to form a plate gap, and the first bus bar is located in the plate gap.
According to some embodiments of the invention, the width of the first bus bar is smaller than the width of the corresponding chip gap, and an absolute value of a difference between the width of the first bus bar and the width of the corresponding chip gap is Δ L, where Δ L satisfies: delta L is more than or equal to 4mm and less than or equal to 10mm.
According to some embodiments of the invention, the cell gaps are formed between two adjacent cells of each cell string, the plurality of cell gaps include a first cell gap and a plurality of second cell gaps, each width of the second cell gap is smaller than that of the first cell gap, the first bus bar is located in the first cell gap, and the cell gaps except the first cell gap in the photovoltaic module are the second cell gaps.
According to some embodiments of the invention, the first sheet gap is S 1 The second sheet gap is S 2 Wherein, the S 1 、S 2 Satisfies the following conditions: s is more than 3mm 1 ≤25mm，-2mm≤S 2 ≤3mm。
According to some embodiments of the invention, the number of the battery pieces contained in the first piece gap is N 1 A second sheet gap between every adjacent two of the plurality of battery sheets within the first sheet gap, wherein N is the number of the second sheet gaps 1 Satisfies the following conditions: n is a radical of 1 ≥20。
According to some embodiments of the invention, the second bus bar is located at a gap between two adjacent battery strings; or at least a portion of the second bus bar is located on a back side of the battery string.
According to some embodiments of the invention, the first bus bar has a width W 1 The thickness of the first bus bar is T 1 The width of the second bus bar is W 2 The thickness of the second bus bar is T 2 Wherein, the W 1 、W 2 、T 1 、T 2 Respectively satisfy: w is not less than 3mm 1 ≤10mm，3mm≤W 2 ≤10mm，0.15mm≤T 1 ≤0.6mm，0.15mm≤T 2 ≤0.6mm。
According to some embodiments of the invention, the second bus bar and the first bus bar are of unitary construction.
According to some embodiments of the present invention, each of the battery cells is one X times of a complete battery cell, where X is a positive integer greater than or equal to 3, the string arrangement direction is a length extension direction of the battery cells, and the battery string extension direction is a width extension direction of the battery cells.
According to some embodiments of the invention, the X further satisfies: x is more than or equal to 3 and less than or equal to 6.
According to some embodiments of the invention, each of the battery pieces has a length L, wherein L satisfies: l is more than or equal to 200mm and less than or equal to 240mm.
According to some embodiments of the present invention, two adjacent battery cells in each battery string are connected in series by a second interconnection structure, a side surface of each battery cell in the thickness direction is provided with a plurality of grid lines, each grid line extends along the extending direction of the second interconnection structure, and the second interconnection structure is electrically connected to the corresponding grid line, the number of the grid lines on the side surface of each battery cell is N, where N satisfies: n is more than or equal to 5 and less than or equal to 7.
According to some embodiments of the invention, two adjacent battery sheets in each battery string are connected in series through a second interconnection structure, the second interconnection structure comprises a first connecting section and a second connecting section, the first connecting section and the second connecting section are connected with each other, the first connecting section is a non-flat section and is connected to the front sides of the battery sheets, the second connecting section is a flat section and is connected to the back sides of the adjacent battery sheets.
According to some embodiments of the invention, two adjacent battery plates in each battery string are connected in series through a second interconnection structure, and at least a part of the second interconnection structure connected with the first bus bar has a thickness T 3 Wherein, the T is 3 Satisfies the following conditions: t is more than or equal to 0.05mm 3 ≤0.2mm。
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 structural diagram of a photovoltaic module according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a battery string according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a plurality of battery strings and a first bus bar according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a plurality of battery strings and a first bus bar according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention.
Reference numerals:
100: a photovoltaic module;
1: a front cover plate; 2: a back cover plate;
3: a battery layer; 31: a battery string; 311: a battery piece;
312: a first sheet gap; 313: a second sheet gap;
32: a cross bus bar; 321: a first bus bar; 322: a second bus bar;
4: packaging a glue film on the front side; 5: packaging a glue film on the back;
6: a bypass diode; 7: a first interconnecting structural member;
8: an end bus bar; 81: an outgoing line; 9: a second interconnecting structural member.
Detailed Description
Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.
A photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1-6.
As shown in fig. 1 to 5, a photovoltaic module 100 according to an embodiment of the present invention includes a front cover sheet 1, a back cover sheet 2, a cell layer 3, and a plurality of bypass diodes 6. In the description of the present invention, "a plurality" means two or more.
The back cover plate 2 is arranged on one side of the front cover plate 1 in the thickness direction, the battery layer 3 is arranged between the front cover plate 1 and the back cover plate 2, a front packaging adhesive film 4 is arranged between the battery layer 3 and the front cover plate 1, and a back packaging adhesive film 5 is arranged between the battery layer 3 and the back cover plate 2. The front surface refers to a main light-receiving surface of the cell sheet 311, that is, a surface of the cell sheet 311 or the photovoltaic module 100 directly receiving sunlight, and the back surface is a surface opposite to the front surface.
For example, referring to fig. 1, the edges of the front cover plate 1, the rear cover plate 2 and the plurality of battery strings 31 may be provided with a frame, and the front cover plate 1 may be glass. When manufacturing the photovoltaic module 100, the front cover plate 1, the front encapsulant film 4, the battery layer 3, the back encapsulant film 5, and the back cover plate 2 may be sequentially placed to complete the preparation work before laminating the photovoltaic module 100. And then, after vacuumizing and heating lamination is performed on the laminated five-layer structure comprising the front cover plate 1, the front packaging adhesive film 4, the battery layer 3, the back packaging adhesive film 5 and the back cover plate 2, the front packaging adhesive film 4 and the back packaging adhesive film 5 are crosslinked and cured to protect the battery layer 3, and finally firm bonding of the five-layer structure (namely the front cover plate 1, the front packaging adhesive film 4, the battery layer 3, the back packaging adhesive film 5 and the back cover plate 2) is realized, and the photovoltaic module 100 is manufactured by additionally installing an aluminum alloy frame (not shown), a junction box and sealing by adopting silica gel.
The battery layer 3 includes a plurality of battery strings 31 and a cross bus bar 32, the plurality of battery strings 31 are arranged along the string arrangement direction and connected in parallel, both ends of the plurality of battery strings 31 are respectively a positive electrode leading end and a negative electrode leading end, and each battery string 31 includes a plurality of battery pieces 311 arranged along the extending direction of the battery string 31 perpendicular to the string arrangement direction and connected in series. Therefore, the circuit design of the photovoltaic module 100 is simple, all the battery pieces 311 can be regularly and relatively closely arranged, the electric connection between the adjacent battery pieces 311 in the battery string 31 is facilitated, the reduction of the occupied space of the whole photovoltaic module 100 is facilitated, and the photovoltaic module 100 can be installed on a roof. In addition, compared with the existing photovoltaic module 100, each cell string 31 is a complete long string, and the interconnection structural members such as solder strips in the cell strings 31 can be disconnected without being connected with a central bus bar, so that the laying of the cell strings 31 is facilitated, the process of the photovoltaic module 100 is simplified, and the production efficiency of the photovoltaic module 100 can be effectively improved.
The cross bus bar 32 includes a first bus bar 321 and a second bus bar 322, the first bus bar 321 extends in the string arrangement direction, and the first bus bar 321 is electrically connected to each of the plurality of cell strings 31, the second bus bar 322 extends in the extending direction of the cell strings 31, and the second bus bar 322 is electrically connected to the first bus bar 321. For example, in the example of fig. 5, the first bus bar 321 and the second bus bar 322 each extend linearly, the first bus bar 321 and the second bus bar 322 are perpendicular to each other, and the number of the battery pieces 311 of the plurality of battery strings 31 located on the same side as the first bus bar 321 is equal. The photovoltaic module 100 includes five cell strings 31 connected in parallel, and the first bus bar 321 divides the five cell strings 31 into upper and lower portions. Therefore, by providing the first bus bar 321 and the second bus bar 322, the first bus bar 321 can transmit the current generated by the photovoltaic effect of the cell sheets 311 of the plurality of cell strings 31 to the second bus bar 322, and finally the current is led out through the second bus bar 322, so as to ensure that the photovoltaic module 100 has higher output power.
Five battery strings 31 are shown in fig. 5 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to other numbers of battery strings 31, and this also falls into the protection scope of the present invention.
A plurality of bypass diodes 6 are connected in reverse parallel between the positive and negative terminals through the second bus bar 322, at least one bypass diode 6 is located between the positive terminal and the junction of the second bus bar 322 and the first bus bar 321, and at least one bypass diode 6 is located between the negative terminal and the junction of the second bus bar 322 and the first bus bar 321. Thus, by providing the bypass diode 6, when the plurality of cell segments 311 located on both sides of the first bus bar 321 are shielded by the shadow, the bypass function can be realized, and the hot spot effect can be prevented from occurring.
According to the photovoltaic module 100 of the embodiment of the invention, the plurality of cell strings 31 and the cross-shaped bus bar 32 including the first bus bar 321 and the second bus bar 322 are arranged, the plurality of cell strings 31 are arranged along the string arrangement direction, each cell string 31 includes the plurality of cell pieces 311 arranged along the extending direction of the cell string 31 perpendicular to the string arrangement direction, and the plurality of bypass diodes 6 are reversely connected in parallel between the positive electrode leading-out end and the negative electrode leading-out end through the second bus bar 322, so that the process of the photovoltaic module 100 is simpler while the photovoltaic module 100 is effectively prevented from generating a hot spot effect, and the production efficiency of the photovoltaic module 100 is effectively improved.
In some embodiments of the present invention, referring to fig. 5 and 6, a plurality of bypass diodes 6 are respectively located at both ends of the second bus bar 322. For example, in the example of fig. 5 and 6, when the cell piece 311 located on the upper side of the first bus bar 321 is shaded by a shadow, since the second bus bar 322 is connected to the first bus bar 321, the bypass diode 6 connected between the upper end of the second bus bar 322 and the corresponding end of the plurality of cell strings 31 can implement a bypass function, and at this time, the cell piece 311 located on the lower side of the first bus bar 321 can still work normally, so that the photovoltaic module 100 can output electric energy outwards; when the cell sheet 311 located on the lower side of the first bus bar 321 is shielded by the shadow, the bypass diode 6 connected between the lower end of the second bus bar 322 and the corresponding end of the plurality of cell strings 31 can realize the bypass function, and at this time, the cell sheet 311 located on the upper side of the first bus bar 321 can still work normally, thereby ensuring the power generation efficiency of the photovoltaic module 100. From this, a plurality of bypass diodes 6 that so set up when effectively avoiding photovoltaic module 100 to produce the hot spot effect, it is more reasonable to set up the position, makes things convenient for the wiring.
In some embodiments of the present invention, at least two bypass diodes 6 connected in parallel are provided between the junction of the second bus bar 322 and the first bus bar 321 and the positive terminal; and/or at least two bypass diodes 6 connected in parallel are arranged between the connection part of the second bus bar 322 and the first bus bar 321 and the negative electrode leading-out end. Therefore, when a plurality of bypass diodes 6 are arranged between the connection position of the second bus bar 322 and the first bus bar 321 and the corresponding leading-out terminal (i.e. the positive leading-out terminal or the negative leading-out terminal), the bypass diode can be applied to the battery piece 311 with a larger size, for example, the length of the battery piece 311 can be 210mm, and the plurality of bypass diodes 6 can play a better shunting role, so that the current requirement on the bypass diodes 6 can be reduced, the temperature of the bypass diodes 6 is prevented from rising sharply, the failure risk of the bypass diodes 6 is greatly reduced, and the cost of the bypass diodes 6 can be reduced. In addition, when some of the bypass diodes 6 fail, the rest bypass diodes 6 still have a better protection effect, so that the reliability of the photovoltaic module 100 can be effectively improved.
In some alternative embodiments of the invention, at least one bypass diode 6 may be located between the front cover plate 1 and the back cover plate 2. For example, the at least one bypass diode 6 may be laminated within the photovoltaic module 100. With such an arrangement, on one hand, the influence of an external environment such as water vapor on the at least one bypass diode 6 can be reduced, so that the at least one bypass diode 6 can have better performance, hot spot protection can be effectively performed on the corresponding battery piece 311, and the battery piece 311 is prevented from generating a hot spot effect; on the other hand, above-mentioned at least one bypass diode 6 can need not to be located the terminal box to make photovoltaic module 100 and the corresponding position department of above-mentioned at least one bypass diode 6 can need not to punch, thereby can avoid photovoltaic module 100 to wet, promote photovoltaic module 100's waterproof performance, avoid photovoltaic module 100 to receive the influence at long-term operation in-process power, effectively improve photovoltaic module 100's long-term reliability.
Of course, the present invention is not limited thereto, and in other alternative embodiments of the present invention, the photovoltaic module 100 further includes at least one junction box, the bypass diode 6 is disposed on the side of the back cover plate 2 away from the front cover plate 1, and the at least one bypass diode 6 is disposed in the junction box. For example, in conjunction with fig. 5 and 6, the photovoltaic module 100 may include two junction boxes and two bypass diodes 6, the two bypass diodes 6 being respectively located in the two junction boxes, and the two junction boxes being respectively located at both ends of the extending direction of the battery string 31. So set up, when bypass diode 6 damaged, can take out the bypass diode 6 that damages through dismantling the terminal box, then put into the terminal box again with bypass diode 6 that the function is intact, make things convenient for bypass diode 6's maintenance and change.
In some embodiments of the present invention, in conjunction with fig. 2 and 5, the battery layer 3 further includes a plurality of first interconnect structures 7 and a plurality of end bus bars 8. The plurality of first interconnection structures 7 are electrically connected to the cell pieces 311 of the plurality of cell strings 31 at both ends in the extending direction of the cell strings 31, the plurality of end bus bars 8 are respectively located at both ends of the plurality of cell strings 31 in the extending direction of the cell strings 31, each end bus bar 8 extends in the string arrangement direction, each end bus bar 8 is connected to the plurality of first interconnection structures 7 of the plurality of cell strings 31 so as to connect the plurality of cell strings 31 in parallel, each end bus bar 8 is provided with an outgoing line 81, and the bypass diode 6 is connected between the end of the second bus bar 322 and the corresponding outgoing line 81.
For example, two end bus bars 8 are shown in the example of fig. 5, and the lead-out wires 81 may include a positive lead-out wire and a negative lead-out wire. One of the two end bus bars 8 is provided with a positive lead wire, and a bypass diode 6 is provided between one end of the second bus bar 322 and the positive lead wire. The other of the two end bus bars 8 is provided with a negative lead wire, and a bypass diode 6 is provided between the other end of the second bus bar 322 and the negative lead wire. Two adjacent battery plates 311 in each battery string 31 may be connected in series through the second interconnection structure 9, so as to lead out the current generated by the photovoltaic effect from the plurality of battery plates 311 of the battery string 31, thereby ensuring a higher output power of the photovoltaic module 100. Thus, by providing the plurality of first interconnecting structural members 7 and the end bus bars 8, the plurality of first interconnecting structural members 7 can transmit the current generated by the photovoltaic effect from the plurality of cell segments 311 of the plurality of cell strings 31 to the end bus bars 8, and the end bus bars 8 can collect the current transmitted by the plurality of first interconnecting structural members 7. By arranging the leading-out wire 81, the leading-out wire 81 can effectively lead out the current generated by the plurality of battery pieces 311, and the bypass diode 6 can be connected, so that the whole photovoltaic module 100 can be effectively protected.
It should be noted that the first interconnection structure 7 and the second interconnection structure 9 may be metal conductive wires commonly used in the photovoltaic field, and the material may be copper wires, or tin-plated copper wires, or conductive wires plated with low-temperature alloy on the surface, such as low-temperature solder strips or bus bars plated with metals such as nickel and lead.
In some alternative embodiments of the present invention, as shown in fig. 5, the outgoing lines 81 may extend in the extending direction of the battery string 31. For example, in the example of fig. 5, both of the outgoing lines 81 are parallel to the second bus bar 322. One of the two lead wires 81 and the second bus bar 322 are opposed to each other in the extending direction of the cell string 31, and the other of the two lead wires 81 and the second bus bar 322 are arranged offset in the string arrangement direction. Therefore, since the lead wire 81 and the second bus bar 322 need to pass through the back cover 2 and be connected to the corresponding bypass diode 6, by extending the lead wire 81 in the extending direction of the battery string 31, the extending direction of the lead wire 81 and the extending direction of the second bus bar 322 can be the same, so that the lead wire 81 and the second bus bar 322 can pass through the same position on the back cover 2, and the opening area of the back cover 2 can be effectively reduced.
In the above-described embodiment, the description is given taking an example in which one of the two lead-out wires 81 and the second bus bar 322 are opposed to each other in the extending direction of the cell string 31, and the other and the second bus bar 322 are arranged in a staggered manner in the string arrangement direction. It is to be understood that it is also possible that both of the lead-out wires 81 and the second bus bars 322 are opposed to each other in the extending direction of the cell string 31, or that both of the lead-out wires 81 and the second bus bars 322 are arranged offset in the string arrangement direction. The invention is not limited in this regard.
Of course, the present invention is not limited thereto, and in other embodiments of the present invention, the lead-out lines 81 may extend in the string arrangement direction (not shown). It is understood that the specific extending direction of the leading-out wire 81 can be specifically set according to actual requirements to better meet the actual application.
In some alternative embodiments of the present invention, each bypass diode 6 is disposed in the corresponding junction box, and the end portion of the second bus bar 322 and the corresponding outgoing line 81 are connected to the corresponding bypass diode 6 through the same wire passing hole, respectively. From this, through the tip that makes second busbar 322 and the same line hole of crossing of leading-out wire 81 that corresponds, can reduce the trompil quantity on back apron 2, it is more convenient to process, and can guarantee back apron 2's structural strength. Moreover, through the two junction boxes arranged on the junction box, the two junction boxes can be used for placing the two bypass diodes 6 respectively, and the split junction box can effectively reduce the number of cables and junction temperature.
In some alternative embodiments of the present invention, as shown in fig. 4, the first bus bar 321 may be located at the rear of the cell sheets 311 within the plurality of cell strings 31. In this way, the first bus bar 321 may not occupy the space in the length direction and the width direction of the photovoltaic module 100, and the distance between two adjacent battery pieces 311 in the battery string 31 may be smaller, so that the photovoltaic module 100 with the same area may accommodate a larger number of battery pieces 311, thereby increasing the power generation amount per unit area of the photovoltaic module 100.
In some alternative embodiments of the present invention, in conjunction with fig. 3-5, at least a portion of the first bus bar 321 is located on a back side of one of the cell sheets 311 of the plurality of cell strings 31. For convenience of description, the battery string 31 in contact with the first bus bar 321 will be referred to as a "contact battery string" hereinafter, the first bus bar 321 is located at the rear of one of the battery sheets 311 in the corresponding contact battery string, and a portion of the first bus bar 321 in contact with the battery sheet 311 of the corresponding contact battery string may be completely covered or partially covered by the corresponding battery sheet 311. All the battery strings 31 may be contact battery strings at this time; alternatively, some of the plurality of battery strings 31 may be contact battery strings. Therefore, with the arrangement, the contact area between the first bus bar 321 and the cell sheet 311 is relatively large, so that the risk of splitting of the cell sheet 311 can be reduced, and the long-term reliability of the photovoltaic module 100 can be improved.
Further, referring to fig. 3 to 5, the first bus bar 321 may be located on the same side of the corresponding plurality of battery pieces 311 in the extending direction of the battery string 31. For example, in the example of fig. 5, the five battery strings 31 are all contact battery strings, the first bus bar 321 is located on the back side of one of the battery pieces 311 of each battery string 31, and the first bus bar 321 is located on the same side of the five battery pieces 311 of the five battery strings 31. With such an arrangement, all the battery pieces 311 can be regularly and relatively closely arranged, on one hand, the electrical connection between two adjacent battery pieces 3111 in the battery string 31 is facilitated, on the other hand, the occupied space of the whole photovoltaic module 100 is reduced, and the appearance attractiveness of the photovoltaic module 100 can be improved.
Of course, both sides of the first bus bar 321 in the width direction may be respectively located at the back surfaces of two adjacent battery pieces 311 in the extending direction of the battery string 31, in which case the first bus bar 321 may contact two adjacent battery pieces 311 of the same battery string 31, and both sides of the first bus bar 321 in the width direction may overlap the edges of two adjacent battery pieces 311. It is understood that the position where the first bus bar 321 is disposed may be specifically determined according to actual requirements to better meet the actual application.
In further alternative embodiments of the present invention, referring to fig. 2 and 3, at least two adjacent battery sheets 311 of each battery string 31 are spaced apart to form a sheet gap, and the first bus bar 321 is located in the sheet gap. Therefore, the first bus bar 321 can be prevented from contacting the adjacent cell sheets 311, so that the risk of splitting of the cell sheets 311 can be reduced, and the reliability of the photovoltaic module 100 can be improved.
In some optional embodiments of the present invention, in conjunction with fig. 3, the width of the first bus bar 321 is less than the width of the corresponding sheet gap, and the absolute value of the difference between the width of the first bus bar 321 and the width of the corresponding sheet gap is Δ L, where Δ L satisfies: delta L is more than or equal to 4mm and less than or equal to 10mm. For example, when Δ L < 4mm, the absolute value of the difference between the width of the first bus bar 321 and the width of the corresponding sheet gap is too small, the first bus bar 321 may overlap the edge of the adjacent cell sheet 311, and thus may cause the cell sheet 311 to be cracked; when Δ L > 10mm, the absolute value of the difference between the width of the first bus bar 321 and the width of the corresponding sheet gap is too large, resulting in too small a density of the plurality of cell sheets 311, and a reduction in the amount of power generation per unit area of the photovoltaic module 100. Thus, by making Δ L satisfy: delta L is more than or equal to 4mm and less than or equal to 10mm, the output power of the photovoltaic module 100 is improved, the risk of splitting of the battery piece 311 can be further reduced, and the long-term reliability of the photovoltaic module 100 is ensured.
In some embodiments of the present invention, referring to fig. 2 and 3, each of two adjacent battery sheets 311 of each battery string 31 has a sheet gap therebetween, the plurality of sheet gaps includes a first sheet gap 312 and a plurality of second sheet gaps 313, each of the second sheet gaps 313 has a width smaller than that of the first sheet gap 312, the first bus bar 321 is located in the first sheet gap 312, and the sheet gap other than the first sheet gap 312 in the photovoltaic module 100 is the second sheet gap 313. Therefore, through the above arrangement, two adjacent battery sheets 311 of each battery string 31 can be spaced apart from each other, and the first bus bar 321 can be located at the maximum sheet gap, so that the first bus bar 321 can be effectively prevented from contacting the adjacent battery sheets 311, and the battery sheets 311 can be better prevented from being cracked.
Optionally, in conjunction with fig. 2 to 4, at least one second sheet gap 313 is provided on at least one side of the first sheet gap 312 in the extending direction of the battery string 31. Therefore, by arranging the first sheet gap 312 and the second sheet gap 313, the first sheet gap 312 is large, so that the first bus bar 321 can be positioned at the first sheet gap 312 when the battery string 31 is connected with the first bus bar 321, the first bus bar 321 can be prevented from contacting the battery sheet 311, and the risk of the battery sheet 311 cracking is effectively reduced; because the second sheet gap 313 is smaller, the density of the plurality of battery sheets 311 can be increased, and the photoelectric conversion efficiency of the photovoltaic module 100 per unit area can be effectively improved, so that the output power of the photovoltaic module 100 can be effectively improved.
Optionally, in conjunction with fig. 2 to 4, at least one second sheet gap 313 is respectively disposed on two sides of the first sheet gap 312. For example, in the example of fig. 2-4, there are six sheet gaps between seven battery sheets 311, including one first sheet gap 312 and five second sheet gaps 313. One side of the first sheet gap 312 has two second sheet gaps 313, and the other side of the first sheet gap 312 has three second sheet gaps 313. Therefore, through the arrangement, at least two battery pieces 311 can be arranged on two sides of the first piece gap 312 respectively, when the battery string 31 is connected with the bypass diodes 6 in parallel through the first bus bar 321 and the second bus bar 322, the number of the battery pieces 311 on two sides of the first bus bar 321 is relatively uniform, so that the number of the battery pieces 311 protected by each bypass diode 6 is relatively uniform, the safety of the bypass diode 6 can be ensured while the hot spot effect of the battery pieces 311 is effectively avoided, and the failure risk of the bypass diode 6 is reduced.
In some alternative embodiments of the invention, the first sheet gap 312 is S 1 The second sheet gap 313 is S 2 Wherein S is 1 、S 2 Satisfies the following conditions: s is more than 3mm 1 ≤25mm，-2mm≤S 2 Is less than or equal to 3mm. Specifically, for example, when S 1 At 3mm or less, the first sheet gap 312 is too small, and when the cell string 31 is connected to the first bus bar 321, the first bus bar 321 may contact the adjacent cell sheet 311, therebyThe risk of cracking the cell sheet 311; when S is 1 If the first sheet gap 312 is too large at > 25mm, the density of the cell sheets 311 is reduced, and the output power of the photovoltaic module 100 is reduced. When-2 mm is less than or equal to S 2 If the width is less than 0mm, the end parts of the two adjacent battery sheets 311 are overlapped along the extending direction of the battery string 31, and the width of the overlapped part of the end parts of the two adjacent battery sheets 311 is | S 2 L (i.e., 0mm to 2 mm); when 0mm < S 2 When the thickness is less than or equal to 3mm, two adjacent battery pieces 311 are arranged at intervals, and the minimum distance between the two adjacent battery pieces 311 is S 2 (i.e., 0mm to 3 mm). Thereby, by making S 1 Satisfies the condition that S is less than 3mm 1 Less than or equal to 25mm, first piece clearance 312 is comparatively reasonable, when reducing battery piece 311 and producing the lobe of a leaf risk, guarantees that photovoltaic module 100 has higher output, has improved photovoltaic module 100's long-term reliability. By making S 2 Satisfies the condition that S is less than or equal to-2 mm 2 3mm, second piece clearance 313 is less to make photovoltaic module 100 of the same size can hold more quantity of battery pieces 311, effectively improve photovoltaic module 100 unit area's photoelectric conversion efficiency, further improved photovoltaic module 100's output.
In some alternative embodiments of the present invention, in conjunction with fig. 2-4, the number of battery pieces 311 contained in the first piece gap 312 is N 1 The sheet gap between each adjacent two of the plurality of battery sheets 311 in the first sheet gap 312 is a second sheet gap 313, where N is 1 Satisfies the following conditions: n is a radical of 1 ≥20。
When there is one first sheet gap 312, the "number of battery sheets 311 included in the first sheet gap 312" refers to the number of battery sheets 311 on either side of the first sheet gap 312; when the first sheet gap 312 is plural, "the number of the battery sheets 311 included in the first sheet gap 312" refers to the number of the battery sheets 311 between two adjacent first sheet gaps 312, and the number of the battery sheets 311 on the side of the outermost first sheet gap 312 away from the other first sheet gaps 312 in the extending direction of the battery string 31.
Thereby, by making N 1 Satisfies the following conditions: n is a radical of 1 Not less than 20, the number of the battery pieces 311 contained in the first piece gap 312 is largerIn order to be reasonable, when the cell string 31 is connected in parallel with the bypass diodes 6 through the first bus bar 321 and the second bus bar 322, the bus bars may be located at the first sheet gap 312, so that the number of the cell sheets 311 protected by each bypass diode 6 may be 20 or more, the bypass diodes 6 may exert their functions to the maximum, and the cost of the photovoltaic module 100 may be effectively reduced while avoiding the hot spot effect generated by the cell sheets 311.
Alternatively, the second bus bar 322 may be located at a gap between two adjacent battery strings 31. With such an arrangement, the second bus bar 322 can be prevented from contacting the cell sheet 311 of the adjacent cell string 31, so that the risk of splitting the cell sheet 311 can be effectively reduced, and the reliability of the photovoltaic module 100 can be improved.
Or alternatively, referring to fig. 5, at least a portion of the second bus bar 322 is located at the rear of the battery string 31. That is, it may be that the entire second bus bar 322 is completely located on the back side of the cell pieces 311 of the cell string 31, or that one portion of the second bus bar 322 is located on the back side of the cell pieces 311 of the cell string 31, and another portion is located at the gap between two adjacent cell strings 31 or the edge of the photovoltaic module 100. In this way, the second bus bar 322 can be hidden on the back of the photovoltaic module 100, so that the dimensions in the length direction and the width direction of the photovoltaic module 100 can be reduced, the arrangement of the plurality of cell strings 31 can be more compact, and the occupied space of the photovoltaic module 100 can be reduced.
Of course, the present invention is not limited thereto, and the second bus bar 322 may be positioned at one side of all the battery strings 31. It is understood that the position where the second bus bar 322 is disposed may be specifically determined according to actual requirements to better meet practical applications.
In some alternative embodiments of the present invention, the first bus bar 321 has a width W 1 The thickness of the first bus bar 321 is T 1 Width of the second bus bar 322 is W 2 The thickness of the second bus bar 322 is T 2 Wherein W is 1 、W 2 、T 1 、T 2 Respectively satisfy: w is not less than 3mm 1 ≤10mm，3mm≤W 2 ≤10mm，0.15mm≤T 1 ≤0.6mm，0.15mm≤T 2 ≤06mm. Wherein, W 1 And W 2 May or may not be equal; t is 1 And T 2 May or may not be equal.
Specifically, for example, when W 1 If the width of the first bus bar 321 is too small, the resistance of the first bus bar 321 is large, which may cause the conductive capability of the first bus bar 321 to be weak, and since the first bus bar 321 is located on the back surface of the battery piece 311, the contact area between the first bus bar 321 and the battery piece 311 may be too small, which increases the risk of breaking the battery piece 311; when W is 1 At > 10mm, the width of the first bus bar 321 is too large, resulting in a high cost of the first bus bar 321. When W 2 When the width of the second bus bar 322 is less than 3mm, the conductive capability is weak; when W is 2 The width of the second bus bar 322 is too large for more than 10mm, which is too costly. When T is 1 、T 2 If the thickness of the first bus bar 321 and the second bus bar 322 is less than 0.15mm, the resistance of the first bus bar 321 and the second bus bar 322 is large, which may cause the conductive capability of the first bus bar 321 and the second bus bar 322 to be weak; when T is 1 、T 2 When the thickness is greater than 0.6mm, the thicknesses of the first bus bar 321 and the second bus bar 322 are too large, which increases the risk of splitting the cell sheet 311 and results in higher cost of the photovoltaic module 100.
Thereby, by making W 1 、W 2 、T 1 、T 2 Respectively satisfy: w is not less than 3mm 1 ≤10mm，3mm≤W 2 ≤10mm，0.15mm≤T 1 ≤0.6mm，0.15mm≤T 2 The width of the first bus bar 321 and the second bus bar 322 is more reasonable, on one hand, the first bus bar 321 and the second bus bar 322 have smaller resistance, stronger conductive capability and lower cost; on the other hand, the risk of splitting the cell sheet 311 can be effectively reduced, and the reliability of the photovoltaic module 100 is ensured. Moreover, the thicknesses of the first bus bar 321 and the second bus bar 322 are reasonable, so that the resistances of the first bus bar 321 and the second bus bar 322 are small, the conductive capability is strong, and the risk of splitting the battery piece 311 can be effectively reduced. Further optionally, W 1 、W 2 Can respectively satisfy: less than or equal to 3mmW 1 ≤8mm，3mm≤W 2 Less than or equal to 8mm, e.g. W 1 And W 2 And may be 7mm. But is not limited thereto.
In some embodiments of the present invention, the second bus bar 322 and the first bus bar 321 may be a unitary structure. For example, the second bus bar 322 and the first bus bar 321 may be welded into a unitary structure before the photovoltaic module 100 is fabricated. So set up, the simple structure of second busbar 322 and first busbar 321, in photovoltaic module 100's manufacture process, can save the welding process of second busbar 322 and first busbar 321, thereby can simplify the process flow of subassembly, effectively improve photovoltaic module 100's machining efficiency, and the wholeness of second busbar 322 and first busbar 321 that so set up is higher, can avoid the junction fracture of second busbar 322 and first busbar 321, thereby can improve the structural strength and the structural stability of second busbar 322 and first busbar 321.
In some alternative embodiments of the present invention, as shown in fig. 2 to 5, each cell 311 may be one-X times of a complete cell, where X is a positive integer greater than or equal to 3, the string arrangement direction is a length extension direction of the cell 311, and the cell string 31 extension direction is a width extension direction of the cell 311. For example, laser scribing may be used to process the battery piece 311.
Therefore, by making X be a positive integer greater than or equal to 3, on the premise that the number of complete cells in a single cell string 31 is not changed, the number of cells 311 connected in series is correspondingly increased, so that the internal loss of the photovoltaic module 100 can be reduced, and the photovoltaic module 100 is ensured to have higher output power, and is helpful for reducing the cost per watt. Moreover, the width of the cell sheet 311 can be smaller, the plurality of cell sheets 311 can be regularly and relatively closely arranged, the size of the photovoltaic module 100 can be further reduced, the reduction of the occupied space of the whole photovoltaic module 100 is facilitated, the installation and the transportation of the photovoltaic module 100 are facilitated, the weight of the whole photovoltaic module 100 can be smaller, and the photovoltaic module 100 can be installed on a roof. In addition, compared with the adoption of the complete battery piece, the complete battery piece with appearance defects can be cut and reused, so that the cost can be effectively reduced. In addition, since the extending direction of the cell string 31 is the width extending direction of the cell sheets 311, the cell string 31 can accommodate a larger number of cell sheets 311, so that the output power of the photovoltaic module 100 can be further improved.
Further optionally, X further satisfies: x is more than or equal to 3 and less than or equal to 6. Specifically, for example, when X < 3, the number of the battery slices 3111 of a single battery string 31 can be generally controlled within thirty, and there is no need to connect the bypass diode 6 in parallel in the single battery string 31 to protect the circuit; when X > 6, the number of the battery slices 3111 in the single battery string 31 is excessive, and since the number of the battery slices 311 protected by the single bypass diode 6 is generally less than or equal to thirty, the bypass diode 6 may break down. Therefore, X is more than or equal to 3 and less than or equal to 6, the bypass diode 6 can fully play the role on the premise of effectively reducing the internal loss of the photovoltaic module 100, and the bypass diode 6 can be prevented from being broken down and damaged while the battery piece 311 is effectively prevented from generating a hot spot effect.
In some alternative embodiments of the present invention, each cell piece 311 has a length L, and each cell piece 311 has a width W 3 Wherein, L satisfies: l is more than or equal to 182mm and less than or equal to 240mm, W is more than or equal to 40mm 3 Less than or equal to 80mm. Thus, by making L satisfy: l is more than or equal to 182mm and less than or equal to 240mm, and the length of the cell piece 311 is larger, so that the effective light-emitting area of the photovoltaic module 100 can be increased, the conversion efficiency and the output power of the photovoltaic module 100 can be increased, and the cost of a single watt can be effectively reduced. Optionally, L may further satisfy: l is more than or equal to 200mm and less than or equal to 240mm.
In some embodiments of the present invention, a plurality of grid lines are disposed on one side surface of each battery sheet 311 in the thickness direction, each grid line extends along the extending direction of the second interconnecting structural member 9, the second interconnecting structural member 9 is electrically connected to the corresponding grid line, the number of grid lines on one side surface of each battery sheet 311 is N, where N satisfies: n is more than or equal to 5 and less than or equal to 7. For example, when N < 5, the number of grid lines is too small, which may result in too low a welding tension between the second interconnection structure 9 and the corresponding battery tab 311; when N > 7, the quantity of grid line is too much to the area of sheltering from to battery piece 311 is too big, influences photovoltaic module 100's output, and can increase the use amount of silver thick liquid, improves photovoltaic module 100's cost. Thus, by making N satisfy: n is more than or equal to 5 and less than or equal to 7, the number of the second interconnection structural members 9 such as solder strips on one side surface of each cell 311 can be 5-7, and on one hand, the welding tension of the second interconnection structural members 9 such as solder strips and the corresponding cell 311 can be improved; on the other hand, the light receiving area of the cell 311 can be increased, the current generated by the cell 311 through the photovoltaic effect can be effectively led out, the photovoltaic module 100 is ensured to have higher output power, and the cost can be reduced.
In some embodiments of the present invention, the second interconnecting structural member 9 includes a first connecting section and a second connecting section (not shown) connected to each other, the first connecting section is a non-flat section and is connected to the front surface of the battery sheet 311, the second connecting section is a flat section and is connected to the back surface of the adjacent battery sheet 311. Here, "flat" is understood to mean a flat and thin shape, and the dimension in the thickness direction is relatively small compared to the dimension in the width direction. For example, the cross-sectional shape of the first connecting section may be triangular or circular. Therefore, by arranging the first connecting section and the second connecting section, because the first connecting section is a non-flat section, the shielding area of the second connecting section on the battery piece 311 can be reduced, the reflectivity is improved, and therefore, the output power of the photovoltaic assembly 100 is improved.
In some embodiments of the invention, at least the portion of the second interconnecting structural member 9 connected to the first bus bar 321 has a thickness T 3 Wherein, T 3 Satisfies the following conditions: t is not less than 0.05mm 3 Less than or equal to 0.2mm. Thus, since the second interconnection structure 9 is located on the back surface of the cell sheet 311, T is formed 3 Satisfies the following conditions: t is not less than 0.05mm 3 Less than or equal to 0.2mm, the first timeThe thickness of the two interconnecting structural members 9 is relatively thin, so that the cell sheet 311 can be effectively prevented from cracking, and the reliability of the photovoltaic module 100 is improved.
In some embodiments of the present invention, as shown in fig. 2 to 4, a distance between the side edges of two adjacent battery sheets 311 adjacent to each other along the extending direction of the battery string 31 is a sheet pitch, and the plurality of battery sheets 311 of each battery string 31 have a plurality of sheet pitches therebetween, at least two of the plurality of sheet pitches being different. Note that the sheet pitch may be a positive value or a negative value. When the sheet spacing is a positive value, two adjacent battery sheets 311 in the battery string 31 are arranged at intervals to form the sheet gap; when the sheet pitch is a negative value, the end portions of two adjacent battery sheets 311 in the battery string 31 overlap, and the width of the overlapping portion of the end portions of two adjacent battery sheets 311 is an absolute value of the sheet pitch.
For example, in the example of fig. 2 to 4, each battery string 31 includes seven battery pieces 311, and two adjacent battery pieces 311 are connected to each other by the second interconnection structure 9 such as a solder ribbon. Two adjacent battery pieces 311 are arranged at intervals along the extending direction of the battery string 31, and the minimum distance between the two adjacent battery pieces 311 is the piece pitch. Therefore, by making at least two of the plurality of inter-cell distances different, when the cell string 31 needs to connect the first bus bars 321 in parallel, the first bus bars 321 can be arranged at a larger inter-cell gap, so that the risk of splitting the cell sheet 311 can be further reduced, and the reliability of the photovoltaic module 100 can be improved.
Other constructions and operations of the photovoltaic module 100 according to embodiments of the present 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", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.
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 the present application can be understood in a specific case by those of ordinary skill in the art.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means 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 present 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 present 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 (22)
1. A photovoltaic module, comprising:
a front cover plate;
the back cover plate is arranged on one side of the front cover plate in the thickness direction;
the battery layer is arranged between the front cover plate and the back cover plate, a front packaging adhesive film is arranged between the battery layer and the front cover plate, a back packaging adhesive film is arranged between the battery layer and the back cover plate, the battery layer comprises a plurality of battery strings and cross bus bars, the battery strings are arranged along a string arrangement direction and are connected in parallel, two ends of the battery strings are respectively a positive leading-out end and a negative leading-out end, each battery string comprises a plurality of battery pieces which are arranged along a battery string extending direction perpendicular to the string arrangement direction and are connected in series, the cross bus bars comprise first bus bars and second bus bars, the first bus bars extend along the string arrangement direction, the first bus bars are electrically connected with the battery strings, the second bus bars extend along the battery string extending direction, and the second bus bars are electrically connected with the first bus bars;
a plurality of bypass diodes each connected in reverse parallel between the positive and negative terminals through the second bus bar, at least one of the bypass diodes being located between the positive terminal and the junction of the second bus bar and the first bus bar, and at least one of the bypass diodes being located between the negative terminal and the junction of the second bus bar and the first bus bar.
2. The photovoltaic module of claim 1, wherein a plurality of the bypass diodes are located at each end of the second bus bar.
3. The photovoltaic module of claim 1, wherein at least two bypass diodes connected in parallel are provided between the junction of the second bus bar and the first bus bar and the positive terminal; and/or
At least two bypass diodes connected in parallel are arranged between the connection position of the second bus bar and the first bus bar and the negative leading-out end.
4. The photovoltaic module of claim 1 wherein at least one of the bypass diodes is located between the front cover sheet and the back cover sheet.
5. The photovoltaic module of claim 1, further comprising:
the bypass diodes are arranged on one side, far away from the front cover plate, of the back cover plate, and the bypass diodes are arranged in the junction box.
6. The photovoltaic module of claim 1, wherein the cell layer further comprises:
a plurality of first interconnection structures electrically connected to the battery sheets at both ends of the plurality of battery strings in the extending direction of the battery strings;
a plurality of tip bus bars, it is a plurality of the tip bus bar is located a plurality of respectively the edge of battery cluster extending direction's both ends, every the tip bus bar is followed the cluster direction of arranging extends, every the tip bus bar is with a plurality of battery cluster first interconnect structure all links to each other so that it is a plurality of battery cluster parallel connection, every be equipped with the lead-out wire on the tip bus bar, bypass diode connects the tip of second bus bar and correspond between the lead-out wire.
7. The photovoltaic module of claim 1, wherein the first bus bar is located on a back side of the cell sheet within the plurality of cell strings.
8. The photovoltaic module of claim 7, wherein at least a portion of the first bus bar is located on a back side of one of the cell sheets of the plurality of cell strings; or
The two sides of the first bus bar in the width direction are respectively located on the back surfaces of two adjacent battery pieces in the extending direction of the battery string.
9. The assembly according to claim 1, wherein at least two adjacent cells of each string are spaced apart to form a cell gap, and wherein the first bus bar is located within the cell gap.
10. The photovoltaic assembly of claim 9, wherein the width of the first bus bar is less than the width of the corresponding sheet gap, and an absolute value of a difference between the width of the first bus bar and the width of the corresponding sheet gap is Δ L, wherein Δ L satisfies: delta L is more than or equal to 4mm and less than or equal to 10mm.
11. The pv module according to claim 9 wherein the cell gaps are formed between two adjacent cells of each cell string, the plurality of cell gaps includes a first cell gap and a plurality of second cell gaps, each of the second cell gaps has a width smaller than a width of the first cell gap, the first bus bar is located in the first cell gap, and the cell gaps other than the first cell gap in the pv module are the second cell gaps.
12. The photovoltaic module of claim 11, wherein the first sheet gap is S 1 The second sheet gap is S 2 Wherein said S 1 、S 2 Satisfies the following conditions: s is more than 3mm 1 ≤25mm，-2mm≤S 2 ≤3mm。
13. The photovoltaic module of claim 11, wherein the number of the cell pieces contained in the first piece of clearance is N 1 A second sheet gap between every adjacent two of the plurality of battery sheets within the first sheet gap, wherein N is the number of the second sheet gaps 1 Satisfies the following conditions: n is a radical of hydrogen 1 ≥20。
14. The photovoltaic module of any of claims 1-13, wherein the second bus bar is located at a gap between two adjacent strings of cells; or
At least a portion of the second bus bar is located on a back side of the battery string.
15. The photovoltaic module of any of claims 1-13, wherein the first bus bar has a width W 1 The thickness of the first bus bar is T 1 The width of the second bus bar is W 2 The thickness of the second bus bar is T 2 Wherein, the W 1 、W 2 、T 1 、T 2 Respectively satisfy: w is not less than 3mm 1 ≤10mm，3mm≤W 2 ≤10mm，0.15mm≤T 1 ≤0.6mm，0.15mm≤T 2 ≤0.6mm。
16. The photovoltaic module of any of claims 1-13, wherein the second bus bar and the first bus bar are a unitary structure.
17. The assembly according to any one of claims 1 to 13, wherein each of the cells is one-X times of a complete cell, wherein X is a positive integer greater than or equal to 3, the string arrangement direction is a length extension direction of the cells, and the string extension direction is a width extension direction of the cells.
18. The photovoltaic module of claim 17, wherein X further satisfies: x is more than or equal to 3 and less than or equal to 6.
19. The photovoltaic module of any of claims 1-13, wherein each of the cell pieces has a length L, wherein L satisfies: l is more than or equal to 200mm and less than or equal to 240mm.
20. The photovoltaic module of any of claims 1-13, wherein adjacent two of the cells within each of the cell strings are connected in series by a second interconnecting structure,
a plurality of grid lines are arranged on one side surface of each battery piece in the thickness direction, each grid line extends along the extending direction of the second interconnection structural member, the second interconnection structural member is electrically connected with the corresponding grid line, the number of the grid lines on the one side surface of each battery piece is N, wherein N satisfies the following conditions: n is more than or equal to 5 and less than or equal to 7.
21. The photovoltaic module according to any one of claims 1 to 13, wherein two adjacent cell pieces in each cell string are connected in series by a second interconnecting structure, the second interconnecting structure comprises a first connecting section and a second connecting section which are connected with each other, the first connecting section is an un-flat section and is connected to the front surface of the cell piece, the second connecting section is a flat section and is connected to the back surface of the adjacent cell piece.
22. The photovoltaic module according to any one of claims 1 to 13, wherein two adjacent cells in each cell string are connected in series via a second interconnecting structure, and at least a portion of the second interconnecting structure connected to the first bus bar has a thickness T 3 Wherein, the T is 3 Satisfies the following conditions: t is not less than 0.05mm 3 ≤0.2mm。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110580672.4A CN115411126A (en) | 2021-05-26 | 2021-05-26 | Photovoltaic module |
| PCT/CN2022/074058 WO2022193845A1 (en) | 2021-03-17 | 2022-01-26 | Photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110580672.4A CN115411126A (en) | 2021-05-26 | 2021-05-26 | Photovoltaic module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115411126A true CN115411126A (en) | 2022-11-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110580672.4A Pending CN115411126A (en) | 2021-03-17 | 2021-05-26 | Photovoltaic module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115411126A (en) |
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2021
- 2021-05-26 CN CN202110580672.4A patent/CN115411126A/en active Pending
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