CN209000924U - Two-sided photovoltaic module - Google Patents
Two-sided photovoltaic module Download PDFInfo
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- CN209000924U CN209000924U CN201821456867.8U CN201821456867U CN209000924U CN 209000924 U CN209000924 U CN 209000924U CN 201821456867 U CN201821456867 U CN 201821456867U CN 209000924 U CN209000924 U CN 209000924U
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 29
- 238000003466 welding Methods 0.000 description 22
- 230000000903 blocking effect Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 239000010703 silicon Substances 0.000 description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 238000007650 screen-printing Methods 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 description 2
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
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- 229910052802 copper Inorganic materials 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- MRNHPUHPBOKKQT-UHFFFAOYSA-N indium;tin;hydrate Chemical compound O.[In].[Sn] MRNHPUHPBOKKQT-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000005299 abrasion Methods 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
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- 238000005245 sintering Methods 0.000 description 1
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
- H01L31/04—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
- H01L31/044—PV modules or arrays of single PV cells including bypass diodes
-
- 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
- H02S40/20—Optical components
-
- 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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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
Abstract
The disclosure provides a kind of two-sided photovoltaic module, is related to solar photovoltaic assembly technical field, can reduce influence of the back side shading to generated energy, slows down consequence caused by hot spot effect, improves the service life of component.The specific technical proposal is: two-sided photovoltaic module includes: at least one battery strings group, with the bypass diode of corresponding battery strings group parallel connection and the shelter being fixed on backboard；Battery strings group is made of battery strings in parallel, and battery strings are composed in series by cell piece；The cell piece being at least partly blocked by obstructions is the cell piece that is blocked；Battery strings containing the cell piece that is blocked are the battery strings that are blocked；Each be blocked be blocked in battery strings cell piece number be more than or equal to 2.
Description
This application claims on 2 10th, 2018 submission Patent Office of the People's Republic of China, application No. is 201820239186X, application name
Referred to as the two-sided photovoltaic stacked wafer moudle of hot spot effect " avoid generate " and application No. is 2018101386163, application is entitled
The priority of the Chinese patent application of " the two-sided photovoltaic stacked wafer moudle for avoiding generating hot spot effect ", entire contents pass through reference
It is incorporated in the present application.
Technical field
This disclosure relates to solar photovoltaic assembly technical field more particularly to a kind of two-sided photovoltaic module.
Background technique
Solar battery is a kind of device that luminous energy is converted into direct current using photovoltaic effect, wherein most often
What is seen is crystal silicon solar energy battery, including monocrystaline silicon solar cell and polysilicon solar cell.Solar battery is usual
For sheet, luminous energy can be absorbed and be translated into the one side of electric energy it is referred to as extinction face or front, in addition one side, which is referred to as, carries on the back
Face.For part solar battery, it is electric energy that the back side, which also can be absorbed and convert luminous energy, these solar batteries are referred to as double
Face battery.By multiple solar battery electricity interlinkage post packages in glass or organic polymer, obtain being used for a long time
Photovoltaic apparatus, referred to as photovoltaic module.
For two-sided photovoltaic module, if terminal box or nameplate to be arranged in the back side of two-sided photovoltaic module, formed
Back side shading leads to module backside lower power production, and hot spot effect can be also generated when serious, reduces the service life of component.For
It avoids hot spot effect that component service life is caused to reduce, in the prior art photovoltaic module is arranged in terminal box or nameplate etc.
Near frame, it is illustrated by taking terminal box as an example in Fig. 1.Although above scheme can be avoided the back side and block, due to wiring
Box or nameplate occupy a large amount of blank area, so the Material Costs such as glass, encapsulating material, frame are increased, simultaneously because
There is no solar battery at terminal box or nameplate, reduces the photoelectric conversion efficiency of photovoltaic module entirety.
Utility model content
The disclosure provides a kind of two-sided photovoltaic module, does not reserve blank area, and can reduce back side shading to generated energy
Influence, slow down consequence caused by hot spot effect, improve the service life of component.The technical solution is as follows:
In a first aspect, the disclosure provides a kind of two-sided photovoltaic module, comprising: at least one battery strings group, with corresponding electricity
The bypass diode of pond string group parallel connection and the shelter being fixed on backboard；
The battery strings group is made of battery strings in parallel；The battery strings are composed in series by cell piece；
It by cell piece that the shelter blocks is at least partly the cell piece that is blocked in the cell piece；Contain the quilt
The battery strings for blocking cell piece are the battery strings that are blocked；
Each be blocked be blocked in battery strings cell piece number be more than or equal to 2.
Above-mentioned two-sided photovoltaic module will not form hot spot effect being blocked on cell piece due to using special shielding mode
It answers, would not also bypass diode be caused to be connected, therefore, can reduce influence of the back side shading to generated energy, slow down hot spot effect
Consequence caused by answering improves the service life of component.
In the first possible implementation of first aspect, the area that is blocked of each cell piece that is blocked is less than
Equal to the 50% of the back side gross area of the corresponding cell piece that is blocked.
The area that is blocked of each cell piece that is blocked is less than or equal to the back side gross area of the corresponding cell piece that is blocked
50%.In this way, the cell piece that is blocked still is able to carry out power generation, while the cell piece that avoids being blocked all is blocked into being negative
Power consumption is carried, influence of the back side shading to generated energy is reduced, slows down consequence caused by hot spot effect, improve the service life of component.
May be in implementation, all described by screening battery strings at second of first aspect, i-th described to be hidden
The number of cell piece in battery strings is Ni, i is the integer more than or equal to 1,5≤Ni≤ 120, and NiFor integer；
It is N by the number of screening cell piece described in screening battery strings that i-th describedi', 2≤Ni'≤20, and Ni' it is integer.
In the third possible implementation of first aspect, the number by screening battery strings is more than or equal to 1 and is less than
Equal to 10.
In the 4th kind of possible implementation of first aspect, the number of the shelter is at least two, and the screening
Block material has interval between each other.
In the 5th kind of possible implementation of first aspect, each shelter is set to the two neighboring battery
The centre of string.
In the 6th kind of possible implementation of first aspect, each shelter blocks at least two adjacent batteries
String.
In the 7th kind of possible implementation of first aspect, the different shelters blocks identical battery strings.
When two-sided photovoltaic module contains at least two shelter, different shelters can block identical battery strings,
The quantity for reducing the battery strings that are blocked, improves the back side power of photovoltaic module, so that influence of the back side shading to generated energy is reduced,
Slow down consequence caused by hot spot effect, improves the service life of component.
In the 8th kind of possible implementation of first aspect, the shelter is at least one of terminal box, nameplate.
In the 9th kind of possible implementation of first aspect, the shelter is in a strip shape；The length of the shelter is prolonged
It is parallel with the concatenation extending direction of the battery strings to stretch direction.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.
Fig. 1 is the schematic diagram of terminal box setting in the prior art；
Fig. 2 is a kind of schematic diagram of cell piece lamination interconnection；
Fig. 3 is a kind of schematic diagram that solar battery sheet is cut into battery slice；
Fig. 4 (a) is a kind of schematic diagram of horizontal version type photovoltaic module；
Fig. 4 (b) is a kind of schematic diagram of vertical version type photovoltaic module；
Fig. 5 is the current -voltage curve schematic diagram after different cell pieces are blocked in same battery strings；
Fig. 6 is a kind of electrical block diagram for two-sided photovoltaic module that the embodiment of the present disclosure provides；
Fig. 7 is the schematic rear view that photovoltaic module shown in fig. 6 includes two terminal boxes；
Fig. 8 is the schematic rear view that photovoltaic module shown in Fig. 7 includes a nameplate；
Fig. 9 is a kind of electrical block diagram for two-sided photovoltaic module that the embodiment of the present disclosure provides；
Figure 10 is the schematic rear view that photovoltaic module shown in Fig. 9 includes three terminal boxes；
Figure 11 is the schematic rear view that photovoltaic module shown in Fig. 10 includes a nameplate；
Figure 12 is the schematic rear view that a kind of two-sided photovoltaic module that the embodiment of the present disclosure provides includes two terminal boxes.
Description of symbols: 1- welding, 2- busbar, 3- bypass welding, 4- parallel connection welding, 5- backplate, 6- terminal box.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
Before introducing two-sided photovoltaic module provided by the embodiment of the present disclosure, introduce and solar cell module phase first
The technology of pass.
As described in the background art, presently the most common solar battery is crystal silicon solar energy battery, crystal
The electrode pattern of silicon solar cell front and back is prepared by the method to metallize in solar cell surface.It is common
Method for metallising be that the electrocondution slurry containing Argent grain is printed on battery surface in such a way that silk-screen printing adds sintering, lead to
Cross the halftone graphic designs for changing silk-screen printing, thus it is possible to vary electrode pattern.
Crystal silicon solar energy battery is other than electrode zone, and front is usually silicon nitride film, and the back side is usually silk-screen printing
Aluminum slurry and form Al-BSF through oversintering.Light can be absorbed for some special solar batteries, such as front and back sides
Two-sided P-type silicon PERC battery or two-sided N-type silicon PERT battery, the region surface other than rear electrode and the thin grid line of metallizing
It is also silicon nitride film.For two-sided HJT battery, i.e. hetero-junction solar cell, the electrode of front and back and the region other than grid line
Surface is transparent conductive oxide film, such as tin indium oxide ITO.
Cell piece mutual contact mode in Crystalline Silicon PV Module, common are and arrange cell piece sequence, to contain Copper base material
Tin-coated welding strip as interconnecting strip, interconnecting strip one end is welded in the front main grid line of first cell piece, the interconnecting strip other end
It is welded in the rear electrode of second adjacent cell piece.The both ends of second interconnecting strip are respectively welded at second cell piece
Front main grid line and third piece cell piece back side grid line on, and so on.Thus all cell pieces are connected into a string.
The technology that stacked wafer moudle is interconnected using another cell piece.As shown in Fig. 2, by solar battery sheet first
One is placed on the lower section of another cell piece second, makes electrode phase mutual respect of the positive gate line electrode in the cell piece first side with the second back side
It closes.It is formed and is conductively connected using conductive material between two electrodes.At the same time, the other side of cell piece second is placed in battery
It is adopted between two electrodes so that the positive gate line electrode in the second other side and the electrode at third back side overlap the lower section of piece third
It is formed and is conductively connected with conductive material.After the same method, multi-disc cell piece can be sequentially interconnected in form battery strings.
Lamination mutual contact mode may also used to form interconnection between solar battery slice.Solar battery is sliced
Refer to the small pieces for a piece of complete or incomplete solar battery being cut by mechanical, laser or other modes.Solar-electricity
The shape of pond slice can be polygon shaped like rectangle, triangle, curvilinear figure such as circle, fan-shaped, ellipse or irregular component
Shape.The number of sections that a piece of solar battery can be cut into is K piece, wherein 1≤K≤20.
For the solar battery sheet of square or rectangle, shape, size K rectangle all the same can be cut to and cut
Piece, wherein 1≤K≤20.
For the quasi- rectangle solar battery sheet with chamfering, it can be cut into K piece slice battery, wherein 1≤K≤
20, and some slice batteries are the quasi- rectangle for having 1 or 2 chamfering, it is the rectangle without chamfering that some, which is sliced battery,.Such as Fig. 3 is
Solar battery sheet is cut into a kind of modes of five slice batteries, the slice battery of the leftmost side and the rightmost side has chamfering, in
Between three slice batteries there is no chamfering.
Conductive material in stacked wafer moudle in same battery strings between adjacent cell plate electrode includes conducting resinl, conducting resinl
The materials such as band, welding or tin cream.According to the characteristic of conductive material, corresponding preparation method should be selected.For using conducting resinl shape
It, can be using the method for dispensing or silk-screen printing at the battery strings of electricity interlinkage.
The main component of conducting resinl includes resin material matrix and conductive filler.Filler therein is usually silver or argentiferous
Particle.Compared with commonly applying tin copper strips, conducting resinl can not only connect with silver electrode at good mechanical adhering force and conduction
The conducting resinl for connecing, while having can also form good viscous with other surfaces of cell piece, such as silicon nitride film layer or silicon materials
It connects.
Since silver is a kind of noble metal, the cost of solar cell size and conducting resinl containing silver is all relatively more high
It is expensive.It can be using for example various carbon materials of cheap metal material such as copper, aluminium, nickel or non-metallic conducting material, tin indium oxide etc.
The silver in slurry or conducting resinl is substituted, it can also be by changing the design of battery surface metal pattern or the design of conductive paste pattern
Accordingly to reduce the usage amount of silver paste or conducting resinl.
As shown in Fig. 4 (a) and Fig. 4 (b), photovoltaic laminate component according to the orientation of battery strings can be divided into horizontal version type with
Two kinds of vertical version type.The battery strings referred to as horizontal version type stacked wafer moudle parallel with component short side, as shown in Fig. 4 (a), battery strings and component
The parallel referred to as vertical version type stacked wafer moudle of long side, as shown in Fig. 4 (b).
It is sliced using two-sided laminated batteries or two-sided laminated batteries, the two-sided PERC laminated batteries of P-type silicon as previously mentioned,
The two-sided PERT laminated batteries of N-type silicon or HJT laminated batteries, by lamination process above-mentioned, available two-sided stacked wafer moudle.
In two-sided stacked wafer moudle, it is divided into N number of long battery strings (N >=1) from left to right.Such as the vertical version type in Fig. 4 (b)
Two-sided stacked wafer moudle contains 6 long battery strings altogether, is denoted as battery strings A, B, C, D, E, F respectively from left to right.
In stacked wafer moudle, all weldings positioned at the positive and negative extreme multiple battery strings of connection of component, referred to as busbar；It is all
It is to be located at component intermediate potential, and connect the welding of multiple battery strings, welding referred to as in parallel；It is all to be connected with welding in parallel, it walks
To the welding for being parallel to battery strings, referred to as bypass welding.
Embodiment one
The disclosure provides a kind of two-sided photovoltaic module, comprising: at least one battery strings group, in parallel with corresponding battery strings group
Bypass diode and the shelter that is fixed on backboard；
Battery strings group is made of battery strings in parallel, and battery strings are composed in series by cell piece；
The cell piece being at least partly blocked by obstructions is the cell piece that is blocked, and the battery strings containing the cell piece that is blocked are
Be blocked battery strings；
Each be blocked be blocked in battery strings cell piece number be more than or equal to 2.
Preferably, be each blocked cell piece be blocked area less than or equal to the corresponding cell piece that is blocked the back side it is total
The 50% of area.In this way, the cell piece that is blocked still is able to carry out power generation, at the same the cell piece that avoids being blocked all blocked and
As load power consumption, influence of the back side shading to generated energy is reduced, slows down consequence caused by hot spot effect, improves the use of component
Service life.
In the disclosure, the quantity for the battery strings that are blocked is M, 1≤M≤10, i-th of cell piece in battery strings that is blocked
Number is Ni, the integer that i is 1 to M, 5≤Ni≤120；I-th by screening battery strings by the number of screening cell piece be Ni', 2≤
Ni’≤20。
Due to the stacked wafer moudle circuit topological structure series-parallel using multiple batteries, the electricity at the battery strings that are blocked both ends
It presses identical as unobstructed battery strings both end voltage in parallel.Hot spot effect in order to prevent, these batteries in parallel connection strings simultaneously with bypass
Diodes in parallel.In this case, if the voltage being blocked in battery strings per a piece of cell piece is all positive, two poles are bypassed
Pipe is not turned on, and the voltage of parallel circuit by unobstructed battery strings and has the dynamic equilibrium shape for blocking and reaching after battery strings influence each other
State determines.Under normal conditions, since unobstructed battery strings occupy the majority, the voltage of parallel circuit is close to nothing under above situation
Block initial voltage of the battery strings before reaching balance.
Due to there is the operating current for blocking battery strings smaller than the operating current of unobstructed battery strings, for blocking
For unobstructed cell piece in battery strings, operating current is less than the operating current under unobstructed state, corresponding work electricity
Pressure can be higher than the operating voltage under unobstructed state.It is assumed that i-th (i=1,2,3 ... M) it is blocked in battery strings each
The operating voltage of unobstructed cell piece averagely rises V than the operating voltage of the unobstructed cell piece in unobstructed battery stringsi, the string
In there is the operating voltage for blocking cell piece averagely to decline V than the operating voltage of the unobstructed cell piece in unobstructed battery stringsi',
Following equation is set up as the above analysis:
Vi*(Ni-Ni')=Vi’*Ni’ (1)
In order to meet the condition that bypass diode is not turned on, Vi' need to meet:
Vi’<Vmp (2)
Wherein, VmpIt is operating voltage of the unobstructed cell piece at maximum power point.
It can be obtained by (1) and (2):
Vi*(Ni/Ni’-1)<Vmp (3)
ViRelated with there is the shielded area ratio for blocking cell piece, shielded area is bigger, ViIt is bigger.
It can be obtained by (3)
Ni’>Ni*Vi/(Vmp+Vi) (4)
By (4) it is found that the area that the cell piece quantity in battery strings is more or cell piece is blocked is bigger, Huo Zhe electricity
The maximum power point operating voltage of pond piece is smaller, and the quantity of the corresponding cell piece that is blocked is more, is just able to satisfy two poles of bypass
The demand that pipe is not turned on.
The disclosure inventors discovered through research that, produce the curve graph of Fig. 5.It is illustrated in figure 5 two-sided photovoltaic module
In there is 1,2,4,8,16,32 cell piece to be blocked by obstructions 20% respectively in a battery strings after current -voltage curve figure,
Curve A represents the IV curve of unobstructed situation lower component in Fig. 5, and 1,2,4,8,16,32 respectively represent in one of battery strings
(IV is bent for current -voltage curve in the case where having 1,2,4,8,16,32 cell piece to be blocked by obstructions 20% area respectively
Line).As seen from Figure 5, after 2 and the above cell piece are blocked, after especially 4 or more cell pieces are blocked, two-sided photovoltaic
The current -voltage curve of component and the current -voltage curve that more cell pieces are blocked are almost the same.From current-voltage song
Line is it is found that near maximum power point, and the operating current for the component that is blocked is less than the operating current of unobstructed component, this is mainly
Since the electric current decline for the battery strings that are blocked causes.If cell piece shielded area is less than 20% or is greater than 20%, component operation
The fall of electric current also correspondingly decreases or increases.For two-sided photovoltaic module, since the back side mainly receives the reflection of earth's surface
Light, its usual light intensity are no more than the 60% of positive light intensity, so the photoproduction electricity that back light is total according to the usual Zhan of photogenerated current generated
The ratio of stream is no more than 37.5%.Therefore after the back side blocks 50%, component operation electric current decline typically not greater than 18.75%.
It, will not be although being derived by above-mentioned formula and experimental data shows that shelter blocks cell piece formation
It is blocked on cell piece and forms hot spot effect, can reduce influence of the back side shading to generated energy, caused by slowing down hot spot effect
Consequence improves the service life of component.
In turn, have in the photovoltaic system being composed in series with the above-mentioned photovoltaic module of example edition type by several pieces, by institute
Having component all, there is the same back side to block situation, therefore (irradiation intensity, ground reflecting rate, environment under the conditions of same external
Temperature etc.), the running current of different components is close, and the back side of shelter, which is blocked, not will lead to additional hot spot generation.
It should be noted that shelter is selected from least one of terminal box or nameplate.In addition, shelter is strip, hide
The long side extending direction of block material is parallel with the extending direction of battery strings group, in this way, no matter two-sided photovoltaic module is horizontal version or erects
Version, can preferably carry out typesetting.
In the disclosure, the number of shelter can be one, be also possible to 2 or 2 or more.When shelter includes extremely
When two few, each shelter has interval between each other.In this case, each shelter can be set two neighboring
The centre of battery strings.
Illustratively, it is illustrated in figure 6 a kind of circuit diagram of photovoltaic module, the photovoltaic module is by two battery strings groups
It is composed in series, each battery strings group is composed in parallel by multiple battery strings, and each battery strings group is in parallel with corresponding bypass diode.
It is illustrated in figure 7 the schematic rear view of photovoltaic module shown in fig. 6, which includes two terminal boxes, two terminal boxes
It is spaced apart from each other, the two terminal boxes are blocked different battery strings respectively and are separately positioned among two battery strings.Fig. 8 is to scheme
6 and photovoltaic module shown in Fig. 7 on the basis of, the module backside schematic diagram after increasing nameplate, part shown in hatched example areas is inscription
Board, (1) nameplate generally strip, the direction that long side extends are parallel with the extending direction of battery strings；(2) nameplate is located at 2
The centre of battery strings, and partial occlusion is respectively formed to multiple batteries in 2 battery strings；(3) two batteries that nameplate is blocked
String is identical as the battery strings that at least one terminal box in two terminal boxes is blocked, and the single battery piece in this 2 string is engraved
The area that board blocks is Less than or equal to about be wired the maximum area that box blocks with single battery piece in string.
It is illustrated in figure 9 a kind of circuit diagram of photovoltaic module, which is composed in series by three battery strings groups,
Each battery strings group is composed in parallel by multiple battery strings, and each battery strings group is in parallel with corresponding bypass diode.Such as Figure 10 institute
It is shown as the schematic rear view of photovoltaic module shown in Fig. 9, which includes three terminal boxes, and three terminal boxes are mutual
Every these three terminal boxes are blocked different battery strings respectively and are separately positioned among two battery strings.Figure 11 is in Fig. 9 and figure
On the basis of photovoltaic module shown in 10, module backside schematic diagram after increasing nameplate, part shown in hatched example areas is nameplate,
(1) nameplate generally strip, the direction that long side extends is parallel with the extending direction of battery strings, and (2) nameplate is located at 2 batteries
The centre of string, and partial occlusion is respectively formed to multiple batteries in 2 battery strings, two battery strings that (3) nameplate is blocked with
The battery strings that at least one terminal box in three terminal boxes is blocked are identical, and the single battery piece in this 2 string is hidden by nameplate
The area of gear is Less than or equal to about be wired the maximum area that box blocks with single battery piece in string.
In the disclosure, when two-sided photovoltaic module contains at least two shelter, different shelters can block phase
Same battery strings, can also block different battery strings.
If two-sided photovoltaic module includes a terminal box and a nameplate, battery strings and terminal box institute that nameplate is blocked
The battery strings blocked may be the same or different.In the battery strings difference that battery strings and terminal box that nameplate blocks are blocked,
The quantity that nameplate and terminal box block different battery strings increases, therefore, the case where blocking same battery string with nameplate and terminal box
It compares, nameplate and terminal box block the back side power ratio nameplate of different battery strings and terminal box blocks the back side of same battery string
Power wants low.That is, nameplate and terminal box block same battery string and block different battery strings than nameplate and terminal box and have
Higher back side power and two-sided rate.
When two-sided photovoltaic stacked wafer moudle includes multiple terminal boxes and a nameplate, battery strings that multiple terminal boxes are blocked
Can be identical, it can be different.When the battery strings that multiple terminal boxes are blocked are identical, battery strings that nameplate is blocked can with connect
The battery that wire box is blocked is identical, can also be different.When the battery strings that multiple terminal boxes are blocked are not identical, battery that nameplate blocks
The battery strings that going here and there can block with any one terminal box in multiple terminal boxes are all different, can also be in multiple terminal boxes one
The battery strings that a terminal box is blocked are identical；Such as terminal box 1 blocks the battery strings that number is 3,4, terminal box 2 blocks number and is
5,6 battery strings, terminal box 3 block the battery strings that number is 4,5, and nameplate can hide with terminal box 1, terminal box 2, terminal box 3
The battery strings of gear are all different perhaps nameplate and terminal box 1 blocks identical battery strings or nameplate and terminal box 2 blocks phase
Same battery strings or nameplate and terminal box 3 block identical battery strings.
For clearer understanding, it is assumed that photovoltaic module includes two shelters, a terminal box, a box nameplate.If inscription
The battery strings that board blocks are identical as the battery strings that terminal box is blocked, and each own N in M battery strings blocking of terminal boxi" (i=
1,2,3......, M) cell piece blocked by nameplate.It is assumed that being wired the work electricity for the cell piece that box blocks in M battery strings
The operating voltage of unobstructed cell piece in the unobstructed string of pressure ratio averagely declines Vi', the work electricity of the cell piece blocked by nameplate
The operating voltage of unobstructed cell piece in the unobstructed string of pressure ratio averagely declines Vi", it is similar with above-mentioned described derivation, it can be with
It obtains:
Vi*(Ni-Ni’-Ni")=Vi’*Ni’+Vi”*Ni” (5)
Vi’<Vmp (6)
Vi”<Vmp (7)
Vi*(Ni/Ni’-1-Ni”/Ni’)<Vmp*(1+Ni”/Ni’) (8)
Ni’+Ni”>Ni*Vi/(Vmp+Vi) (9)
When (4) are set up, due to Ni" > 0, therefore (9) are set up.So the presence of nameplate can't generate under this shielding mode
Hot spot effect.
If when the battery strings difference that the battery strings that nameplate blocks and terminal box are blocked, it is assumed that there is M battery strings to be hidden by nameplate
Gear, in the M battery strings blocked by nameplate, j-th (j=1,2,3 ..., M) there is N in battery stringsjA (5≤Nj≤120)
Cell piece has N in j-th of battery stringsj" (j=1,2,3 ..., M) a cell piece blocked by nameplate.
Due to there is the operating current for blocking battery strings smaller than the operating current of unobstructed battery strings, block battery
The operating voltage of each unobstructed cell piece averagely rises V than the operating voltage of the unobstructed cell piece in unobstructed string in stringj,
Having to block each has the operating voltage for blocking cell piece than the work of the unobstructed cell piece in unobstructed battery strings in battery strings
Average voltage declines Vj".It is similar with above-mentioned derivation, available formula (10):
Nj”>Nj*Vj/(Vmp+Vj) (10)
When (4) and (10) are respectively set up, terminal box and nameplate will not generate hot spot effect to blocking for module backside.
However, the module backside of this scheme has 3~4 string electricity compared with nameplate and terminal box block the scheme of identical 2 string
Pond go here and there by partial occlusion, therefore its back side power ratio nameplate and terminal box block it is identical 2 string scheme want low.In other words, nameplate
The scheme for blocking identical 2 string with terminal box has higher back side power and two-sided rate than blocking the scheme of different strings.
In addition, being applicable not only to the two-sided photovoltaic stacked wafer moudle of frame due in nameplate setting overleaf plate, being also suitable
In the two-sided photovoltaic stacked wafer moudle of Rimless, the environment damage in the abrasion and use process generated in transport installation can reduce
It is bad, improve the durability of nameplate in transport and use process.Meanwhile it being compared to and reducing nameplate size and word in the prior art
Nameplate is arranged overleaf the not technical solution of the blank space of cell piece, is not necessarily to reduce the size of nameplate in the present embodiment by body
With the font on nameplate, convenient for the installation and reading of nameplate.It should be noted that the color of nameplate is usually white, dual light
The cell piece lied prostrate in stacked wafer moudle is deep blue-black, nameplate is arranged in the back side of component, just from two-sided photovoltaic stacked wafer moudle
Face is seen as a whole color, and then improves the aesthetics of two-sided photovoltaic stacked wafer moudle.
Due to the two-sided photovoltaic module topological structure series-parallel using multiple batteries, then, the battery strings that are blocked both ends
Voltage is identical as the voltage of unobstructed battery strings in parallel, meanwhile, battery strings in parallel are in parallel with corresponding bypass diode.?
In this case, when it is each be blocked be blocked in battery strings cell piece number be more than or equal to 2 when, be each blocked cell piece
A part of power can be shared, hot spot effect will not be formed being blocked on cell piece, would not also bypass diode be caused to be led
It is logical, therefore, it can reduce influence of the back side shading to generated energy, slow down consequence caused by hot spot effect, improve the use of component
Service life.
Embodiment two
Based on two-sided photovoltaic module described in embodiment one kind, a specific embodiment of the disclosure is as shown in figure 12,
The two-sided photovoltaic module includes the long string of 6 batteries, is followed successively by A, B, C, D, E, F from left to right, and the long string of each battery is double by 76
Face battery slice composition, the length of each battery slice are 156.75mm, and width is 26.125mm, and the shape of battery slice is square
Shape or round rectangle, the fillet number of round rectangle are 1,2,3 or 4.The lamination overlap distance of adjacent cell slice is 1mm.Wiring
Box 6 install position at dashed rectangle,
The both ends of the long string ABCDEF of battery pass through welding 1 respectively and are connected with the busbar 2 at component both ends；Busbar 2 passes through
Lead-out wire is connected with the bypass diode in terminal box 6.The long string ABCDEF of battery is made of two short string respectively, is led between short string
Cross welding connection.These weldings connect together further through a welding 4 in parallel.Welding 4 in parallel is located between the short string of upper and lower battery,
It is parallel with component short side.Have a bypass welding 3 between battery strings CD, bypass the both ends of welding 3 respectively with two two poles of bypass
Pipe is connected, and the centre for bypassing welding 3 is connected with welding 4 in parallel.In the embodiment, the front and back of component is glass.Back
It is provided with 2 holes on surface glass 5, draws one end of bypass welding 3 respectively in each hole or lead-out wire, He Yigen busbar 2 draws
The lead-out wire of outlet, bypass welding 3 or its lead-out wire and busbar 2 connects two ends of bypass diode respectively.Bypass diode position
In in terminal box 6.Module backside has 2 terminal boxes, and each terminal box forms each four cell pieces at the both ends battery strings C and D
It blocks, shielded area accounts for about the 10% of corresponding cell piece area.For the embodiment, if the positive solar irradiation amount of component is
Every square metre of 1000W, the reflected light radiation amount of module backside are every square metre of 200W, the work in the unobstructed situation of battery strings C, D
It is about 0.55V as voltage.It calculates it is found that the electric current for battery strings C, D that terminal box is blocked is no more than than the decline of unobstructed situation
1.7%.The unobstructed situation of operating voltage ratio C, D string of unobstructed cell piece in corresponding battery strings C, D rises above
0.01V, so the total working voltage of 68 unobstructed cell pieces rises above 0.68V in C, D string, corresponding 8 are blocked
The operating voltage of cell piece averagely declines 0.085V, since 0.085 much smaller than 0.55, by the analysis of front it is found that rear connection
Blocking for box not will cause hot spot effect.
Due to the two-sided photovoltaic module topological structure series-parallel using multiple batteries, then, the battery strings that are blocked both ends
Voltage is identical as the voltage of unobstructed battery strings in parallel, meanwhile, battery strings in parallel are in parallel with corresponding bypass diode.?
In this case, when it is each be blocked be blocked in battery strings cell piece number be more than or equal to 2 when, be each blocked cell piece
A part of power can be shared, hot spot effect will not be formed being blocked on cell piece, would not also bypass diode be caused to be led
It is logical, therefore, it can reduce influence of the back side shading to generated energy, slow down consequence caused by hot spot effect, improve the use of component
Service life.
Those skilled in the art will readily occur to its of the disclosure after considering specification and practicing disclosure disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by above-mentioned
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (10)
1. a kind of two-sided photovoltaic module characterized by comprising at least one battery strings group, with the corresponding battery strings group
Bypass diode in parallel and the shelter being fixed on backboard；
The battery strings group is made of battery strings in parallel；The battery strings are composed in series by cell piece；
The cell piece at least partly blocked by the shelter in the cell piece is by screening cell piece；Electricity is hidden containing described
The battery strings of pond piece are by screening battery strings；
It is each it is described described in screening battery strings by the number of screening cell piece be more than or equal to 2.
2. two-sided photovoltaic module according to claim 1, which is characterized in that each face that is blocked by screening cell piece
Product is less than or equal to the 50% of each back side gross area by screening cell piece.
3. two-sided photovoltaic module according to claim 1, which is characterized in that
All described by screening battery strings, i-th of number by the cell piece in screening battery strings is Ni, i be more than or equal to
1 integer, 5≤Ni≤ 120, and NiFor integer；
It is N by the number of screening cell piece described in screening battery strings that i-th describedi', 2≤Ni'≤20, and Ni' it is integer.
4. two-sided photovoltaic module according to claim 3, which is characterized in that the number by screening battery strings is more than or equal to
1 and be less than or equal to 10.
5. two-sided photovoltaic module according to claim 1, which is characterized in that the number of the shelter is at least two,
And the shelter has interval between each other.
6. two-sided photovoltaic module according to claim 5, which is characterized in that each shelter is set to two neighboring
The centre of the battery strings.
7. two-sided photovoltaic module according to claim 5, which is characterized in that each shelter blocks at least two phases
Adjacent battery strings.
8. two-sided photovoltaic module according to claim 5, which is characterized in that the different shelters block identical electricity
Pond string.
9. two-sided photovoltaic module according to claim 1, which is characterized in that the shelter is terminal box, in nameplate
It is at least one.
10. two-sided photovoltaic module according to claim 1, which is characterized in that the shelter is in a strip shape；The shelter
Length extending direction it is parallel with the concatenation extending direction of the battery strings.
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| CN201810138616.3A CN108461558A (en) | 2018-02-10 | 2018-02-10 | Avoid generating the two-sided photovoltaic stacked wafer moudle of hot spot effect |
| CN2018101386163 | 2018-02-10 | ||
| CN201820239186 | 2018-02-10 | ||
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| CN201811039750.4A Pending CN109301010A (en) | 2018-02-10 | 2018-09-06 | Two-sided photovoltaic module |
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|---|---|---|---|---|
| CN109301010A (en) * | 2018-02-10 | 2019-02-01 | 隆基绿能科技股份有限公司 | Two-sided photovoltaic module |
| CN112736155A (en) * | 2020-12-28 | 2021-04-30 | 晋能清洁能源科技股份公司 | Novel version type photovoltaic module |
| US20220384667A1 (en) * | 2019-09-18 | 2022-12-01 | Trina Solar Co., Ltd | Sliced cell photovoltaic module |
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| JP2021082722A (en) * | 2019-11-20 | 2021-05-27 | 株式会社カネカ | Solar cell module |
| DE102020128080B4 (en) * | 2020-10-26 | 2022-07-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein | solar cell module |
| DE102021103099A1 (en) * | 2021-02-10 | 2022-08-11 | Hanwha Q Cells Gmbh | Photovoltaic module and a method for its manufacture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201478310U (en) * | 2009-06-26 | 2010-05-19 | 比亚迪股份有限公司 | Solar battery assembly |
| KR101249899B1 (en) * | 2011-05-16 | 2013-04-03 | 엘지전자 주식회사 | Photovoltaic module |
| CN108091703B (en) * | 2014-05-27 | 2021-04-09 | 迈可晟太阳能有限公司 | Overlapping type solar cell module |
| KR102339975B1 (en) * | 2015-03-31 | 2021-12-15 | 엘지전자 주식회사 | Junction box and solar cell module including the same |
| CN206040653U (en) * | 2016-08-31 | 2017-03-22 | 连云港神舟新能源有限公司 | Two -sided electricity generation dual glass assembly |
| CN106449818B (en) * | 2016-11-21 | 2017-11-28 | 泰州隆基乐叶光伏科技有限公司 | A kind of photovoltaic laminate component with bypass diode |
| CN209000924U (en) * | 2018-02-10 | 2019-06-18 | 隆基绿能科技股份有限公司 | Two-sided photovoltaic module |
| CN114759109A (en) * | 2020-12-29 | 2022-07-15 | 南通美能得新能源科技股份有限公司 | Laminated solar module |
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|---|---|---|---|---|
| CN109301010A (en) * | 2018-02-10 | 2019-02-01 | 隆基绿能科技股份有限公司 | Two-sided photovoltaic module |
| US20220384667A1 (en) * | 2019-09-18 | 2022-12-01 | Trina Solar Co., Ltd | Sliced cell photovoltaic module |
| CN112736155A (en) * | 2020-12-28 | 2021-04-30 | 晋能清洁能源科技股份公司 | Novel version type photovoltaic module |
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