CN109841699A - Back contact solar cell group string and preparation method thereof, component - Google Patents
Back contact solar cell group string and preparation method thereof, component Download PDFInfo
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- CN109841699A CN109841699A CN201910261558.8A CN201910261558A CN109841699A CN 109841699 A CN109841699 A CN 109841699A CN 201910261558 A CN201910261558 A CN 201910261558A CN 109841699 A CN109841699 A CN 109841699A
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- 239000010703 silicon Substances 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 16
- 229910004205 SiNX Inorganic materials 0.000 description 15
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The present invention provides a kind of back contact solar cell group string and preparation method, component, group string includes multiple battery units in multiple lines and multiple rows arrangement, it is equipped with the more positive-electrode fine grid lines being arranged alternately and the superfine grid line of negative electricity to the back side of each battery unit, it is in alignment with each other between more positive-electrode fine grid lines and is in alignment with each other between the more superfine grid lines of negative electricity, one end of positive-electrode fine grid line is jag relative to the other end of positive-electrode fine grid line relative to the other end that one end of the superfine grid line of negative electricity is jag and the superfine grid line of negative electricity, the correspondingly jag interphase distribution of the jag of the positive-electrode fine grid line of the battery unit of adjacent rows and adjacent column and the superfine grid line of negative electricity；The battery cells in series of each battery unit and row adjacent thereto, and/or and column adjacent thereto battery cells in series；Anode and cathode are formed in the neighboring edge for the outermost two neighboring battery unit for being located at group string.A group string is used in component, busbar usage amount, lifting assembly performance can be reduced.
Description
Technical field
The present invention relates to technical field of solar batteries, in particular to a kind of back contact solar cell group string and its preparation
Method, component.
Background technique
Solar battery is a kind of semiconductor devices for converting light energy into electric energy, production cost low as far as possible and high as far as possible
Energy conversion efficiency be always solar cell industry pursue target.Conventional solar battery negative electrode contact electrode and
Positive electrode contact electrode is located at the tow sides of cell piece, and the front of battery is light-receiving surface, front metal electrode main grid line
And the covering of thin grid line will cause the sunlight of a part of incidence to be reflected by metal electrode, and a part of optics is caused to damage
It loses.The area coverage of the front metal electrode of common crystal silicon solar batteries reduces the front covering of metal electrode 7% or so
The energy conversion efficiency for the battery that can directly improve.
Full back contact solar cell be it is a kind of by positive electrode and negative electrode contact electrode be both placed in cell backside (it is non-by
Smooth surface) battery, the light-receiving surface of the battery is blocked without any metal electrode, to effectively increase the short circuit current of cell piece,
It is improved the energy conversion efficiency of cell piece.Correspondingly, using the solar cell module of full back contact solar cell
It being capable of power with higher.
Patent document CN106409929A discloses a kind of full back contact solar cell component, which includes being connected in series
Back contact solar baby battery piece, the back side of back contact solar baby battery piece has positive-electrode fine grid line and the superfine grid of negative electricity
Line, positive-electrode fine grid and the superfine grid of negative electricity are parallel to each other and are arranged alternately, the both ends of positive-electrode fine grid and the two of the superfine grid of negative electricity
End is misaligned, wherein one end of positive-electrode fine grid relative to the superfine grid of negative electricity one end have jag, positive-electrode fine grid it is another
One end has relative to the other end of the superfine grid of negative electricity shortens end, the one end of one end of the superfine grid of negative electricity relative to positive-electrode fine grid
With end is shortened, the other end of the superfine grid of negative electricity has jag relative to the other end of positive-electrode fine grid, using conductive tape
Or welding is by the wherein jag of the thin grid of a back contact solar baby battery piece and adjacent back contact solar baby battery piece
Opposite polarity thin grid jag series connection；It is connected between more string back contacts Sunny cell pieces by busbar.
Longer busbar is needed in above-mentioned back contact solar cell component, component power has biggish on busbar
Loss.
Summary of the invention
In view of this, the present invention provides a kind of back contact solar cell group string, to solve back contact solar cell
Longer busbar is needed in component, component power is having the problem of compared with lossy on busbar.
The present invention also provides a kind of preparation methods of above-mentioned back contact solar cell group string.
The present invention also provides a kind of back contact solar cell components with above-mentioned back contact solar cell group string.
In order to solve the above technical problems, the invention adopts the following technical scheme:
The back contact solar cell group string of embodiment according to a first aspect of the present invention, including multiple back contact solars electricity
The back side of pool unit, each back contact solar cell unit is equipped with more positive-electrode fine grid lines and the superfine grid line of negative electricity,
The positive-electrode fine grid line is parallel to each other and is arranged alternately with the superfine grid line of the negative electricity, between the more positive-electrode fine grid lines
It is in alignment with each other and is in alignment with each other between the more superfine grid lines of negative electricity, one end of the positive-electrode fine grid line is relative to described negative
One end of the thin grid line of electrode is the other end of jag and the superfine grid line of the negative electricity relative to the another of the positive-electrode fine grid line
One end is jag；
Multiple back contact solar cell units are arranged in multiple lines and multiple rows, correspondingly the institute of adjacent rows and adjacent column
State the jag phase of the jag and the superfine grid line of the negative electricity of the positive-electrode fine grid line of back contact solar cell unit
Between arrange；
The back contact solar cell unit string of each back contact solar cell unit and row adjacent thereto
Connection, and/or and column adjacent thereto the back contact solar cell unit series connection, make the back contact solar cell group
String forms current path；Also, it is being located at the outermost two neighboring back contacts of the back contact solar cell group string too
The neighboring edge of positive energy battery unit forms anode and cathode.
Further, in each back contact solar cell unit, opposite side edge is respectively equipped with multiple positive electricity
The jag of the jag of superfine grid line and multiple superfine grid lines of negative electricity, the jag of multiple positive-electrode fine grid line
It is evenly spaced apart distribution, and the jag of multiple superfine grid line of the negative electricity is evenly spaced apart distribution.
Further, in each back contact solar cell unit, the jag of the positive-electrode fine grid line and institute
It states and is corresponded between the jag of the superfine grid line of negative electricity and equidistant.
Further, described to be connected in series through conductive glue connection or welding.
Further, the more positive-electrode fine grid lines of each back contact solar cell unit respectively with positive electricity
The connection of pole main gate line, the more superfine grid lines of negative electricity are connect with negative electrode main gate line respectively.
Further, the back contact solar cell unit includes the first battery unit and the second battery unit,
First battery unit be two, two first battery units be located at outermost a line and adjacent to each other,
Two first battery units only respectively adjacent with one side back contact solar cell unit series connection with its not
It forms concatenated opposite side and is respectively formed anode and cathode,
Two respectively in the back contact solar cell unit adjacent thereto of second battery unit are connected in series.
Further, two first battery units are located at corner.
Further, the anode connects the positive-electrode fine grid line by welding rod and is formed, and the cathode connects institute by welding rod
The thin grid line of back electrode is stated to be formed.
Further, multiple back contact solar cell units are arranged into 2M row × 2N column, and the M and N difference are only
It is on the spot the integer more than or equal to 2.
Further, back contact solar cell unit described in the 1st row is serially connected between any two,
1st row and the 2nd row, the 3rd row and the 4th row, until between 2M-1 row and 2M row, positioned at two of outermost column
It is serially connected between the back contact solar cell unit, in addition to the back contact solar cell unit described in the 1st row, every row
Among the back contact solar cell unit, in addition to be located at the 1st column with the 2nd column the back contact solar cell unit it
Between be not connected to except remaining connect with the adjacent back contact solar cell unit,
It is described to be located at the among back contact solar cell unit described in every row and other than the 1st row and last line
1 column with the 2nd column the back contact solar cell unit respectively with the back contact solar cell unit of its next line
Series connection.
Further, back contact solar cell unit described in the 1st row is serially connected between any two,
3rd column and the 4th arrange, until 2N-1 is arranged between 2N column, positioned at two back contacts sun of 2M row
It can be serially connected between battery unit, the 2nd column and the 3rd column, until between 2N-2 and 2N-1 column, positioned at two of the 2nd row
It is serially connected between the back contact solar cell unit,
Positioned at the 1st column with 2N column the back contact solar cell unit respectively with the MWT of its next line too
Positive energy battery cells in series,
The MWT solar battery cell point other than the 1st column are with 2N column and other than the 1st row, in each column
It does not connect with the MWT solar battery cell of its next line.
Further, the spacing between the two neighboring back contact solar cell unit is less than 0.5mm.
The preparation method of the back contact solar cell group string of embodiment according to a second aspect of the present invention, including following step
It is rapid:
Step S1 obtains multiple back contact solar cell units, the back of each back contact solar cell unit
Face is equipped with more positive-electrode fine grid lines and the superfine grid line of negative electricity, and the positive-electrode fine grid line and the superfine grid line of the negative electricity are mutually flat
It goes and is arranged alternately, be in alignment with each other between the more positive-electrode fine grid lines and right each other between the more superfine grid lines of negative electricity
Together, one end of the positive-electrode fine grid line is jag and the superfine grid of the negative electricity relative to one end of the superfine grid line of the negative electricity
The other end of line is jag relative to the other end of the positive-electrode fine grid line；
Step S2, by multiple back contact solar cell units in multiple lines and multiple rows arrange, correspondingly adjacent rows and
The jag and the superfine grid line of the negative electricity of the positive-electrode fine grid line of the back contact solar cell unit of adjacent column
Jag interphase distribution.
Step S3, by the back contact solar of each back contact solar cell unit and row adjacent thereto electricity
Pool unit series connection, and/or and column adjacent thereto the back contact solar cell unit series connection, make the back contacts sun
It can battery pack string formation current path；And it is connect in the outermost two neighboring back for being located at the back contact solar cell group string
The neighboring edge of touching solar battery cell forms anode and cathode, obtains the back contact solar cell group string.
Further, in the step S1, further include choosing back contact solar cell piece, cut the back contacts sun
Energy cell piece is to obtain multiple back contact solar cell units.
Further, the back contact solar cell unit includes the first battery unit and the second battery unit,
First battery unit is two, and two first battery units are located at corner, two first batteries
Unit is located at outermost a line and adjacent to each other, and only the back adjacent with one side connects two first battery units respectively
Touching solar battery cell is connected to be respectively formed anode and cathode in its not formed concatenated opposite side,
Two respectively in the back contact solar cell unit adjacent thereto of second battery unit are connected in series.
The back contact solar cell component of embodiment according to a third aspect of the present invention, the back contacts including above-described embodiment
Solar battery group string.
Further, the back contact solar cell component includes multiple back contact solar cell group strings, and
Multiple back contact solar cell group strings are in multiple lines and multiple rows and one or more layers arrangement, multiple back contact solars electricity
Pond group is series-parallel and summarizes and is connected in terminal box.
Further, the back contact solar cell group string is the back that two the first battery units are located at corner
Contact solar cell group string, wherein multiple back contact solar cell group strings are arranged in 2 rows 2 column, and multiple described first
Battery unit is adjacent to each other positioned at the center of the back contact solar cell component.
Above-mentioned technical proposal of the invention one of at least has the advantages that:
Back contact solar cell group string according to an embodiment of the present invention, by each back contact solar cell unit and
The back contact solar cell unit of row adjacent thereto is connected, and/or and column adjacent thereto back contact solar cell unit
Series connection is to form current path, and the anode for organizing string is formed in the outermost phase of back contact solar cell group string with cathode
The neighboring edge of adjacent two back contact solar cell units, due to back contact solar cell group provided in an embodiment of the present invention
The anode and cathode of string are closer, therefore back contact solar cell group string provided in an embodiment of the present invention is applied to the sun
In energy battery component, the usage amount of busbar can be greatly reduced, reduce consumption of the component power on busbar, lifting assembly
Performance.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of back contact solar cell piece；
Fig. 2-a is a kind of positive cutting schematic diagram of back contact solar cell piece；
Fig. 2-b is a kind of back side cutting schematic diagram of back contact solar cell piece；
Fig. 3-a is the positive cutting schematic diagram of another back contact solar cell piece；
Fig. 3-b is the back side cutting schematic diagram of another back contact solar cell piece；
Fig. 4-a is the back contact solar cell unit transverse connection schematic diagram being cut into two Fig. 2-b；
Fig. 4-b is the longitudinally connected schematic diagram of back contact solar cell unit being cut into two Fig. 2-b；
Fig. 5-a is the back contact solar cell unit transverse connection schematic diagram being cut into two Fig. 3-b；
Fig. 5-b is the longitudinally connected schematic diagram of back contact solar cell unit being cut into two Fig. 3-b；
Fig. 6 is the back contact solar cell group string of one embodiment of the invention；
Fig. 7 is the back contact solar cell group string of another embodiment of the present invention；
Fig. 8 is the back contact solar cell component of one embodiment of the invention；
Fig. 9 is the back contact solar cell component of another embodiment of the present invention.
Appended drawing reference:
Back contact solar cell unit 20；First battery unit 21；Second battery unit 22；
Silicon substrate 1；Front court 2；Emitter region 3；Back surface field area 4；Front passivating film 5；
Backside passivation film 6；Positive electrode contact point 7；Negative electrode contact point 8.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing, the technical solution of the embodiment of the present invention is clearly and completely described.
Back contact solar cell group string according to an embodiment of the present invention is mainly by multiple back contact solar cell units
20 are constituted, and back contact solar cell unit 20 can be cut by back contact solar cell piece and be obtained, first below specifically
Introduce the structure and preparation method of back contact solar cell piece.
As shown in Figure 1, back contact solar cell piece includes that silicon substrate 1 (can be n-type silicon matrix, be also possible to p-type silicon
Matrix is hereinafter illustrated by taking n-type silicon matrix as an example), the front court n+ 2 is equipped on 1 front of n-type silicon matrix, on the front court n+ 2
Equipped with front passivating film 5, it is equipped with p+ doping emitter region 3 on 1 back side of n-type silicon matrix and n+ adulterates back surface field area 4, in p+
It adulterates emitter region 3 and n+ doping back surface field area 4 is equipped with backside passivation film 6, overleaf the p+ on passivating film 6 adulterates transmitting
There are corresponding positive electrode contact point 7 and negative electrode contact point 8 on polar region domain 3 and n+ doping back surface field area 4, that is to say overleaf blunt
Change film 6 on p+ doping emitter region 3 and n+ doping back surface field area 4 be equipped with thin grid line, p+ adulterate emitter region 3 on
For its thin grid line connected as positive-electrode fine grid line, it is superfine as negative electricity that n+ adulterates thin grid line connected to it on back surface field area 4
Grid line, p+ adulterates emitter region 3 and n+ doping back surface field area 4 is respectively multiple, can be in multiple lines and multiple rows spaced relation, can
Symmetrically to arrange.
Back contact solar cell on piece can have main gate line, can also not have main gate line.Middle back contact solar
The positive-electrode fine grid line and the superfine grid line of negative electricity of cell piece are interdigitated arrangement, the back side one of each back contact solar cell piece
One is accordingly parallel to each other equipped with more positive-electrode fine grid lines and the superfine grid line of negative electricity, positive-electrode fine grid line with the superfine grid line of negative electricity
And be arranged alternately, be in alignment with each other between more positive-electrode fine grid lines and be in alignment with each other between the more superfine grid lines of negative electricity, positive electrode
One end of thin grid line is the other end of jag and positive-electrode fine grid line relative to the another of negative electrode relative to one end of negative electrode
One end is to shorten end.
The resistivity of n-type silicon matrix 1 can be 1-30 Ω cm, and thickness can be 50-300 μm, and the p+ at the back side adulterates hair
The sheet resistance of emitter region is 50-300ohm/sq, and the sheet resistance of the n+ doping back surface field area at the back side is 10-100ohm/sq, positive n
The sheet resistance of+front court 2 is 70-300ohm/sq；Front passivating film 5 and backside passivation film 6 can be respectively silica (SiOx), oxygen
The lamination for changing one or more of aluminium (AlOx), titanium oxide (TiOx), silicon thin film (polysilicon, micron silicon or amorphous silicon) is multiple
Film is closed, thickness can be 1nm-200nm, for example, front passivating film 5 is Al2O3/SiNx、SiO2/SiNx、SiO2/Al2O3/SiNx
Deng preferably SiO2For/SiNx as front passivating film 5, passivating film 5 thickness in front can be 60-200nm；Backside passivation film 6 can
To select Al2O3/SiNx、SiO2/SiNx、SiO2/SiCN、SiO2/ SiON etc., preferably SiO2/Al2O3/ SiNx is blunt as the back side
Change film 6, the thickness of backside passivation film 6 can be 45-600nm.Passivated reflection reducing can also be formed in positive front passivating film 5
Film, overleaf could be formed with passivation protection film on passivating film 6, passivated reflection reducing membrane and passivation protection film can all be silicon nitrides
(SiNx), thickness can be 30nm-200nm, and the back side of n-type silicon matrix 1 can be a kind of for making herbs into wool face, burnishing surface or wet etching face
Or two kinds be alternately distributed.
A kind of preparation method of above-mentioned back contact solar cell piece is specific as follows:
A. positive back side doping, chooses n-type silicon matrix 1, selects N-shaped single crystal silicon substrate, and resistivity is 1-30 Ω cm,
With a thickness of 50-300 μm, which is first handled through surface wool manufacturing using preceding, then utilizes diffusion, laser boring, ion implanting
The p+ doping emitter region 3 and n+ that the technical combinations such as annealing, exposure mask, etching are arranged alternately with each other in the production of silicon substrate back surface
Back surface field area 4 is adulterated, makes the front court n+ 2 of low surface dopant concentration in silicon substrate body front surface.
B. front passivating back is passivated the front court n+ in front surface deposition antireflective overlayer passivation film, makes on the front court n+
Front passivating film 5, front passivating film 5 can also be formed with passivated reflection reducing membrane, and front passivating film 5 can be Al2O3/SiNx、
SiO2/SiNx、SiO2/Al2O3/ SiNx etc., preferably SiO2/ SiNx can be as front passivating film 5,5 film thickness of front passivating film
60-200nm.It is deposited in rear surface and increases reflective stacks passivating film to p+ doping emitter region 3 and the n+ doping implementation of back surface field area 4
Subregion is passivated or is passivated simultaneously to form backside passivation film 6, and backside passivation film can choose as Al2O3/SiNx、SiO2/
SiNx、SiO2/SiCN、SiO2/ SiON etc., preferably SiO2/Al2O3/ SiNx is as backside passivation film 6, the film of backside passivation film 6
Thickness can be 45-600nm.
C. back up makes positive electrode contact point on p+ doping 3 domain of emitter region, can make and adulterate transmitting with p+
The positive-electrode fine grid line that polar region 3 connects can make negative electrode contact point on n+ doping back surface field area 4, can adulterate in n+
The superfine grid line of negative electricity connecting with n+ doping back surface field area 4 is made on back surface field area 4.Making contact point can be using printing silver paste
Directly burn the mode of backside passivation film, can also be open using first laser republish or plating metal by the way of, thus shape
At the Ohmic contact of contact point and silicon substrate, dot shape is contacted without limitation, single contact point area can be 100um2-
30000um2。
The back contacts sun that can be cut into back contact solar cell unit 20 can be prepared by above-mentioned method
It can cell piece.
Back contact solar cell group string according to an embodiment of the present invention is specifically described with reference to the accompanying drawing.
Back contact solar cell group string according to an embodiment of the present invention, including multiple back contact solar cell units,
The back side of each back contact solar cell unit 20 is equipped with more positive-electrode fine grid lines and the superfine grid line of negative electricity, positive-electrode fine grid
Line is parallel to each other and is arranged alternately with the superfine grid line of negative electricity, is in alignment with each other between more positive-electrode fine grid lines and more negative electricity are superfine
It is in alignment with each other between grid line, one end of positive-electrode fine grid line is jag relative to one end of the superfine grid line of negative electricity and negative electricity is superfine
The other end of grid line is jag relative to the other end of positive-electrode fine grid line；Multiple back contact solar cell units 20 are in more
Row multiple row is arranged, correspondingly the protrusion of the positive-electrode fine grid line of the back contact solar cell unit 20 of adjacent rows and adjacent column
The jag interphase distribution at end and the superfine grid line of negative electricity；
The series connection of the back contact solar cell unit 20 of each back contact solar cell unit 20 and row adjacent thereto,
And/or and column adjacent thereto back contact solar cell unit 20 connect, make back contact solar cell group string formed electric current
Access；Also, in the outermost two neighboring back contact solar cell unit 20 for being located at back contact solar cell group string
Neighboring edge formed anode and cathode.
That is, back contact solar cell group string is mainly made of multiple back contact solar cell units 20,
In, back contact solar cell unit can be obtained by cutting back contact solar cell piece, such as Fig. 2-a and Fig. 2-b institute
Show, the back side of each back contact solar cell unit 20 can be equipped with more positive-electrode fine grid lines and the superfine grid of Duo Gen negative electricity
Line, more positive-electrode fine grid lines and the superfine grid line of Duo Gen negative electricity can be arranged correspondingly, positive-electrode fine grid line and negative electrode
Thin grid line can be used in collected current, can also be in positive-electrode fine grid line and the superfine grid line of negative electricity as shown in Fig. 3-a and Fig. 3-b
On be connected separately with main gate line, will be exported after current convergence that thin grid line is collected by main gate line, positive-electrode fine grid line and negative electricity
Superfine grid line is parallel to each other and is arranged alternately, and positive-electrode fine grid line and the superfine grid line of negative electricity have certain spacing distance, interval
Distance can according to need reasonable selection, be in alignment with each other between more positive-electrode fine grid lines and between the more superfine grid lines of negative electricity that
This alignment, one end of positive-electrode fine grid line is jag relative to one end of the superfine grid line of negative electricity, and the superfine grid line of negative electricity is another
One end is jag relative to the other end of positive-electrode fine grid line, in order to which positive-electrode fine grid line is connected with the superfine grid line of negative electricity.
Multiple back contact solar cell units 20 can arrange in multiple lines and multiple rows, can symmetrically arrange, specifically
Line number and columns can according to need selection, and the quantity of back contact solar cell unit 20 can be according to a group output work for string
Rate, size of components area etc. reasonably select, and correspondingly the back contact solar cell unit 20 of adjacent rows and adjacent column is being just
The jag of the thin grid line of electrode and the jag interphase distribution of the superfine grid line of negative electricity, that is to say, in each row, left and right is adjacent
Adjacent edge is respectively positive-electrode fine grid line jag and the superfine grid line of negative electricity in two back contact solar cell units 20
Jag, in each column, same side edge is respectively positive electricity in neighbouring two back contact solar cell units 20
The jag of superfine grid line and the jag of the superfine grid line of negative electricity, the opposite side edge position of each back contact solar cell unit 20
It sets with the superfine grid line of positive-electrode fine grid line and negative electricity for welding, main gate line can also be increased in positive and negative anodes, by will be more
The arrangement connection of a back contact solar cell unit 20 can obtain battery component.
The series connection of the back contact solar cell unit 20 of each back contact solar cell unit 20 and row adjacent thereto,
And/or and column adjacent thereto back contact solar cell unit 20 connect, make back contact solar cell group string formed electric current
Access；Also, in the outermost two neighboring back contact solar cell unit 20 for being located at back contact solar cell group string
Neighboring edge formed anode and cathode.Pass through the back contacts sun of each back contact solar cell unit and row adjacent thereto
Can battery cells in series, and/or and column adjacent thereto back contact solar cell unit connect to form current path, and
And the anode and cathode of group string are formed in the outermost two neighboring back contact solar electricity of back contact solar cell group string
The neighboring edge of pool unit, due to back contact solar cell group string provided in an embodiment of the present invention anode and cathode distance compared with
Closely, therefore by back contact solar cell group string provided in an embodiment of the present invention it is applied in solar cell module, Ke Yi great
The big usage amount for reducing busbar reduces consumption of the component power on busbar, lifting assembly performance.
According to some embodiments of the present invention, in each back contact solar cell unit 20, opposite side edge is respectively equipped with
The jag of multiple positive-electrode fine grid lines and the jag of the superfine grid line of multiple negative electricity, the jag of multiple positive-electrode fine grid line
It is evenly spaced apart distribution, and the jag of the superfine grid line of multiple negative electricity is evenly spaced apart distribution, in order to two neighboring
The connection of back contact solar cell unit 20 reduces the loss of electric energy.
Other embodiments according to the present invention, in each back contact solar cell unit 20, positive-electrode fine grid line
It is corresponded between jag and the jag of the superfine grid line of negative electricity and equidistant.
In some embodiments of the invention, in each back contact solar cell unit 20, multiple positive-electrode fine grid lines
It can be connected by conducting resinl or welding, so that the positive-electrode fine grid line of each back contact solar cell unit 20 is connected in parallel
Together, the superfine grid line of multiple negative electricity is connected by conducting resinl or welding, so that each back contact solar cell unit 20
The superfine grid line of negative electricity is connected in parallel.
Preferably, the series connection of two neighboring back contact solar cell unit 20 can by conductive glue connection or welding,
It can be attached by welding, it can be by the multiple positive-electrode fine grid lines of connection in each back contact solar cell unit 20
Welding and each back contact solar cell unit 20 in the weldings of the multiple superfine grid lines of negative electricity of connection connect, can also lead to
It crosses a welding and the positive-electrode fine grid line of two neighboring back contact solar cell unit 20 and the superfine grid line of negative electricity is passed through into weldering
Band connection, so that two neighboring back contact solar cell unit 20 is connected.
Optionally, more positive-electrode fine grid lines of each back contact solar cell unit 20 respectively with positive electrode main gate line
Connection, the more superfine grid lines of negative electricity connect with negative electrode main gate line respectively, two neighboring back contact solar cell unit 20 it
Between can pass through conducting resinl or welding and connect positive electrode main gate line and negative electrode on two back contact solar cell units 20
Main gate line connection.
In some embodiments of the invention, back contact solar cell unit 20 may include the first battery unit 21 with
Second battery unit 22, that is to say, include the first battery unit 21 and the second electricity in multiple back contact solar cell units 20
Pool unit 22, the first battery unit 21 can be two, two the first battery units 21 be located at outermost a line and adjacent to each other,
Two the first battery units 21 only connect with not formed at its respectively by the back contact solar cell unit 20 adjacent with one side
Concatenated opposite side is respectively formed anode and cathode, the second battery unit 22 distinguish back contact solar cell unit adjacent thereto
Two in 20 are connected in series, herein it is adjacent include in the same row left and right it is adjacent, be also included within neighbouring in same row.Phase
Connection type between adjacent two back contact solar cell units 20 can be by laterally or longitudinally connecting, as depicted in fig. 4-a
For 20 lateral connection of back contact solar cell unit being cut into two Fig. 2-b, two or so the adjacent back contacts sun
The positive-electrode fine grid line and the thin grid line lateral connection of back electrode of energy battery unit 20, cut as Fig. 4-b is shown in two Fig. 2-b
Back contact solar cell unit 20 out is longitudinally connected, the positive electricity of two neighbouring back contact solar cell units 20
Superfine grid line and the thin grid line of back electrode are longitudinally connected；As Fig. 5-a show the back contact solar being cut into two Fig. 3-b electricity
20 lateral connection of pool unit, the positive-electrode fine grid line and back electrode of two or so adjacent back contact solar cell units 20 are thin
Grid line lateral connection, as to show the back contact solar cell unit 20 being cut into two Fig. 3-b longitudinally connected by Fig. 5-b.
First battery unit 21 and the second battery unit 22 can be contacted becomes a group string, in two the first battery units 21, one
A to can be used as a group head end for string, another can be used as a group tail end for string, can be by a group back contacts for the head end of string and tail end
Solar battery cell 20 connects respectively with corresponding conduct piece to be powered to outside.
In other embodiments of the invention, two the first battery units 21 can be located at corner, go here and there and connect convenient for group
The connection of wire box, multiple groups of series windings are easy to when connecing so that electric junction box is located at the center of component rather than edge.
In certain embodiments, anode can connect positive-electrode fine grid line by welding rod and be formed, and cathode can be by welding rod
The connection superfine grid line of negative electricity is formed, can the head end of formation group string and tail end after concatenation back contact solar cell unit 20
On unwelded thin grid line respectively weld a positive electrode and negative electrode welding rod, in unwelded positive-electrode fine grid line
One welding rod of upper welding welds a welding rod as cathode as anode on the unwelded superfine grid line of negative electricity, can will just
Pole is connect with terminal box respectively with cathode, for example, multiple groups can be connected in terminal box later in series and parallel.
Some specific embodiments according to the present invention, multiple back contact solar cell units 20 can be arranged into 2M row ×
2N column, M and N can be separately the integer more than or equal to 2, and specific line number can close according to the actual needs with columns
Reason selection, for example, can be according to selection line number and columns such as group size, output power, the output voltages of string.
In some preferred embodiments, multiple back contact solar cell units 20 can be arranged into 2M row × 2N column, M and
N can be separately the integer more than or equal to 2, and the 1st row back contact solar cell unit 20 is serially connected between any two,
1st row and the 2nd row, the 3rd row and the 4th row, until between 2M-1 row and 2M row, positioned at outermost column two back contacts too
It is positive to be serially connected between battery unit 20, in addition to the 1st row back contact solar cell unit 20, every row back contact solar
Among battery unit 20, in addition to be located at the 1st column the 2nd column back contact solar cell unit 20 between be not connected to other than remaining
It connects with adjacent back contact solar cell unit 20, and other than the 1st row and last line, every row back contact solar
Among battery unit 20, positioned at the 1st column with the 2nd column back contact solar cell unit 20 respectively with the back contacts of its next line
Solar battery cell 20 is connected.
For example, M is 5, N 3, it is that multiple back contact solar cell units 20 can be arranged into 10 rows × 6 column, such as schemes
Shown in 6, the 1st row of one behavior of top side, the 10th row of one behavior of lower side, the rightmost side one be classified as the 1st column, the leftmost side one is classified as the 6th
Column.Back contact solar cell unit 20 in 1st row is serially connected between any two, two neighboring back contact solar cell list
Positive-electrode fine grid line and the superfine grid line of negative electricity in member 20 are connected in series by welding or conducting resinl, the 1st row and the 2nd row, the 3rd row
With the 4th row, the 5th row and the 6th row, the 7th row and eighth row, until between the 9th row and the 10th row, be located at outermost column (the 1st column with
6th column) two back contact solar cell units 20 between be serially connected, can pass through welding or conducting resinl series connection.
In addition to the 1st row back contact solar cell unit 20, among every row back contact solar cell unit 20, in addition to
Back contact solar except being not connected between the 1st column and the back contact solar cell unit 20 of the 2nd column in remaining column
Battery unit 20 is connected with adjacent back contact solar cell unit 20, that is to say, is located at the 2nd row to the 10th row and is located at the
The back contact solar cell unit 20 of 2 column to the 6th column, two back contact solar cell units 20 string adjacent in a line
Connection.
And other than the 1st row and last line (the 10th row), among every row back contact solar cell unit 20, it is located at
The back contact solar cell unit 20 of 1st column and the 2nd column is gone here and there with the back contact solar cell unit 20 of its next line respectively
Connection, that is to say, the back contact solar cell unit 20 in the 1st column and the 2nd column, positioned at the back contacts sun of the 2nd row and the 3rd row
Energy battery unit 20 is connected, and is connected positioned at the 4th row with the back contact solar cell unit 20 of the 5th row, and the 6th row and the 7th are located at
Capable back contact solar cell unit 20 is connected, and is connected positioned at eighth row with the back contact solar cell unit 20 of the 9th row,
By forming back contact solar cell unit group string after series connection.In the 1st column and positioned at the back contacts sun of the 10th row
Energy battery unit 20 can be using after welding electrode as anode, in the 2nd column and positioned at the back contact solar cell of the 10th row
Unit 20 can be connected in terminal box using after welding electrode as cathode by positive electrode and negative electrode.
In other preferred embodiments, multiple back contact solar cell units 20 can be arranged into 2M row × 2N column, M
It can be separately the integer more than or equal to 2 with N, the 1st row back contact solar cell unit 20 is mutually gone here and there between any two
Connection, the 3rd column and the 4th arrange, until 2N-1 is arranged between 2N column, positioned at two back contact solar cell units of 2M row
Be serially connected between 20, the 2nd column and the 3rd column, until 2N-2 and 2N-1 column between, positioned at the 2nd row two back contacts too
It is positive to be serially connected between battery unit 20, positioned at the 1st column and 2N column back contact solar cell unit 20 respectively with its
The MWT solar battery cell 20 of next line is connected, other than the 1st column are with 2N column and other than the 1st row, in each column
MWT solar battery cell 20 is connected with the MWT solar battery cell 20 of its next line respectively.
For example, M is 5, N 3, it is that multiple back contact solar cell units 20 can be arranged into 10 rows × 6 column, such as schemes
Shown in 7, the 1st row of one behavior of top side, the 10th row of one behavior of lower side, the rightmost side one be classified as the 1st column, the leftmost side one is classified as the 6th
Column.1st row back contact solar cell unit 20 is serially connected between any two, two neighboring back contact solar electricity in the 1st row
Pool unit 20 is connected, and the 3rd column and the 4th arrange, until the 5th arranges between the 6th column and be located at two back contact solars of the 10th row
It is serially connected between battery unit 20, passes through welding or conductive glue connection.2nd column and the 3rd column, until the 4th and the 5th column between,
And be located between two back contact solar cell units 20 of the 2nd row and be serially connected, positioned at the back contacts of the 1st column and the 6th column
Solar battery cell 20 is connected with the MWT solar battery cell 20 of its next line respectively, other than the 1st column are with 2N column
And other than the 1st row, MWT solar battery cell 20 in each column respectively with the MWT solar battery cell of its next line
20 series connection, by forming back contact solar cell unit group string after series connection.Positioned at the 10th row and it is located at the 1st column and the 2nd column
Two back contact solar cell units 20 have the thin grid line of unwelded electrode respectively, be located at the 1st column in and be located at the 10th row
Back contact solar cell unit 20 can using after welding electrode as anode, positioned at the 2nd column in and be located at the 10th row back connect
Touching solar battery cell 20 can be connected in terminal box using after welding electrode as cathode by positive electrode and negative electrode.
In some specific embodiments, back contact solar cell unit 20 and the adjacent back contacts sun up and down
Can all close-packed arrays of battery unit 20, the spacing between two neighboring back contact solar cell unit 20 can be less than 0.5mm.
Since the relative position between back contact solar cell unit 20 all forms an entirety by welding fixation, its spacing can
To be decreased within 0.5mm, compared to the area that conventional group string has saved spacing, group string medium spacing, the utilization rate of light is increased,
The power of identical dimensional conditions the following group string significantly improves.
Back contact solar cell group string according to an embodiment of the present invention passes through multiple back contact solar cell units 20
It arranges in multiple lines and multiple rows, gap is smaller between battery unit, makes full use of the useful space, reduces component area, saves component material
Material, convenient for the connection between battery unit, convenient for a group connection for string and terminal box, the electric energy loss of reduction group string, raising group string
Efficiency, reduce production cost；Pass through the back contact solar of each back contact solar cell unit and row adjacent thereto
Battery cells in series, and/or and column adjacent thereto back contact solar cell unit connect to form current path, and
The anode and cathode of group string are formed in the outermost two neighboring back contact solar cell of back contact solar cell group string
The neighboring edge of unit, due to back contact solar cell group string provided in an embodiment of the present invention anode and cathode distance compared with
Closely, therefore by back contact solar cell group string provided in an embodiment of the present invention it is applied in solar cell module, Ke Yi great
The big usage amount for reducing busbar reduces consumption of the component power on busbar, lifting assembly performance.
The present invention also provides a kind of preparation methods of the back contact solar cell group string of above-described embodiment, including following step
It is rapid:
Step S1 obtains multiple back contact solar cell units, the back side of each back contact solar cell unit 20
Equipped with more positive-electrode fine grid lines and the superfine grid line of negative electricity, more positive-electrode fine grid lines and the superfine grid line of negative electricity can be corresponded
Ground setting, positive-electrode fine grid line are parallel to each other and are arranged alternately with the superfine grid line of negative electricity, between more positive-electrode fine grid lines each other
It is in alignment with each other between alignment and the more superfine grid lines of negative electricity, the one end of one end of positive-electrode fine grid line relative to the superfine grid line of negative electricity
It relative to the other end of positive-electrode fine grid line is jag for the other end of jag and the superfine grid line of negative electricity.
Step S2 arranges multiple back contact solar cell units 20 in multiple lines and multiple rows, correspondingly adjacent rows and phase
The jag of the positive-electrode fine grid line of the back contact solar cell unit 20 of adjacent column is alternate with the jag of the superfine grid line of negative electricity
Arrangement.
In step s 2, multiple back contact solar cell units 20 can in multiple lines and multiple rows arrange, can with symmetry arrangement,
Multiple back contact solar cell units 20 are arranged into 2M row × 2N column, and M and N can separately be whole more than or equal to 2
Number.Interphase distribution is specifically, in each row, the adjacent both sides edge in two neighboring back contact solar cell unit 20 divides
Not Wei positive-electrode fine grid line jag and the superfine grid line of negative electricity jag, in each column, neighbouring two back contacts
Same side edge is respectively the jag of positive-electrode fine grid line and the jag of the superfine grid line of negative electricity in solar battery cell 20.
During arrangement, spacing between two neighboring back contact solar cell unit 20 can be less than 0.5mm, and when connection can lead to
It crosses welding or conducting resinl back contact solar cell unit 20 is connected in series.
Step S3, by the back contact solar cell unit of each back contact solar cell unit 20 and row adjacent thereto
20 series connection, and/or and column adjacent thereto back contact solar cell unit 20 connect, make back contact solar cell group string
Form current path；And in the outermost two neighboring back contact solar cell list for being located at back contact solar cell group string
The neighboring edge of member 20 forms anode and cathode, obtains back contact solar cell group string.
Specifically, in step sl, further include choosing back contact solar cell piece, cut back contact solar cell piece
To obtain multiple back contact solar cell units 20.
Preferably, back contact solar cell unit 20 include the first battery unit 21 and the second battery unit 22, first
Battery unit 21 is two, and two the first battery units 21 are located at corner, and two the first battery units 21 are located at outermost a line
And it is adjacent to each other, two the first battery units 21 only respectively back contact solar cell unit 20 series connection adjacent with one side with
Anode is respectively formed in its not formed concatenated opposite side and cathode, the second battery unit 22 distinguish the back contacts sun adjacent thereto
Can two in battery unit 20 be connected in series, herein adjacent include in the same row left and right it is adjacent, be also included in same row
It is neighbouring.
In the preparation process of back contact solar cell group string, in each back contact solar cell unit 20, opposite side
Edge is respectively equipped with the jag of multiple positive-electrode fine grid lines and the jag of the superfine grid line of multiple negative electricity, multiple positive-electrode fine
The jag of grid line is evenly spaced apart distribution, and the jag of the superfine grid line of multiple negative electricity is evenly spaced apart distribution.Often
In a back contact solar cell unit 20, between the jag of the superfine grid line of jag and negative electricity of positive-electrode fine grid line one by one
It is corresponding and equidistant.
Preferably, in each back contact solar cell unit 20, multiple positive-electrode fine grid lines pass through conducting resinl or welding
Connection, multiple superfine grid lines of negative electricity are connected by conducting resinl or welding.
Preferably, in the cascade process of multiple back contact solar cell units 20, series connection can pass through conductive glue connection
It connects or welds.
Optionally, more positive-electrode fine grid lines of each back contact solar cell unit 20 respectively with positive electrode main gate line
Connection, the more superfine grid lines of negative electricity connect with negative electrode main gate line respectively, two neighboring back contact solar cell unit 20 it
Between can pass through conducting resinl or welding and connect positive electrode main gate line and negative electrode on two back contact solar cell units 20
Main gate line connection.
In some embodiments, anode is formed by welding rod connection positive-electrode fine grid line, and cathode connects back electrode by welding rod
Thin grid line is formed.
In other embodiments, multiple back contact solar cell units 20 can be arranged into 2M row × 2N column,
In, M and N can be separately the integer more than or equal to 2.
Preferably, the 1st row back contact solar cell unit is serially connected between any two, the 1st row and the 2nd row, the 3rd row with
4th row, until between 2M-1 row and 2M row, the phase between two back contact solar cell units 20 of outermost column
Mutually series connection, in addition to the 1st row back contact solar cell unit 20, among every row back contact solar cell unit 20, in addition to
Remaining and the adjacent back contacts sun except being not connected between the 1st column and the back contact solar cell unit 20 of the 2nd column
Energy battery unit 20 is connected, and other than the 1st row and last line, among every row back contact solar cell unit 20, position
In the 1st column with the 2nd column back contact solar cell unit 20 respectively with the back contact solar cell unit 20 of its next line
Series connection.
Preferably, the 1st row back contact solar cell unit 20 is serially connected between any two, the 3rd column with the 4th column, until
Between 2N-1 column and 2N column, it is serially connected between two back contact solar cell units 20 of 2M row, M and N
It can be separately the integer more than or equal to 2, the 2nd column and the 3rd arrange, until between 2N-2 and 2N-1 column, are located at the 2nd
It is serially connected between two capable back contact solar cell units 20, positioned at the back contact solar electricity of the 1st column and 2N column
Pool unit 20 is connected with the MWT solar battery cell 20 of its next line respectively, other than the 1st column are with 2N column and in addition to the
Except 1 row, the MWT solar battery cell 20 in each column is connected with the MWT solar battery cell 20 of its next line respectively.
In some specific embodiments, the spacing between two neighboring back contact solar cell unit 20 is less than
0.5mm。
The preparation method of back contact solar cell group string according to the present invention, can prepare the back in above-described embodiment
Contact solar cell group string, can reduce the spacing in battery unit, reduce whole volume, convenient for a group connection for string, drop
Low electric energy loss, the efficiency of raising group string, reduces cost；In the above-mentioned methods, pass through each back contact solar cell unit
Connect with the back contact solar cell unit of row adjacent thereto, and/or and column adjacent thereto back contact solar cell list
Member series connection is to form current path, and the anode for organizing string is formed in the outermost of back contact solar cell group string with cathode
The neighboring edge of two neighboring back contact solar cell unit, due to back contact solar cell provided in an embodiment of the present invention
The anode and cathode of group string are closer, therefore back contact solar cell group string provided in an embodiment of the present invention is applied to too
In positive energy battery component, the usage amount of busbar can be greatly reduced, reduce consumption of the component power on busbar, promotion group
Part performance.
The present invention also provides a kind of back contact solar cell components, including the back contact solar electricity in above-described embodiment
Pond group string, multiple back contact solar cell group strings are arranged in multiple lines and multiple rows, multiple back contact solar cell groups it is series-parallel and
Summarize and is connected in terminal box.
Preferably, back contact solar cell component may include multiple back contact solar cell group strings, and back contacts
Solar battery group string is the back contact solar cell group string that two the first battery units 21 are located at corner, wherein multiple back
Contact solar cell group string is in the column arrangement of 2 rows 2, and multiple first battery units 21 are adjacent to each other to be located at back contact solar electricity
The center of pond component, thus terminal box can be located at back contact solar cell component center rather than edge.
In some embodiments, multiple back contact solar cell group strings can arrange in multiple lines and multiple rows, can symmetrically arrange
Cloth can be the integer more than or equal to 1 for 2N group string, N, and multiple back contact solar cell group strings can be arranged in multiple lines and multiple rows
Cloth in one plane forms one layer, can also be arranged on multilayer planar and form multilayer, can carry out lamination, lamination and dress
After the packaging technologies such as frame, anode and cathode on group string can be aggregated into one just in component internal in form in parallel respectively
Electrode and a negative electrode simultaneously draw and are connected to and connect in terminal box, or can be separately connected using Split type connecting box multiple groups of strings it
After reconnect, for example, two group strings or four group strings, terminal box can be located at the center of back contact solar cell component without
It is edge.Fig. 8 show the back contact solar electricity being connected into using four back contact solar cell group series windings as shown in FIG. 6
Pond component, Fig. 9 show the back contact solar electricity being connected into using four back contact solar cell group series windings as shown in Figure 7
Pond component, the anode and cathode that group is gone here and there can be aggregated into a positive electrode and one in component internal in form in parallel respectively
Negative electrode simultaneously draws and is connected to and connects in terminal box.
Keep the string spacing of 2-3mm to prevent the group string in lamination process and group string in general components between group string and group string
Between relative displacement generate variation and lead to folded string phenomenon, since the relative position of every battery unit all forms one by welding fixation
Whole, without using busbar between back contact solar cell group string, therefore the spacing of its battery unit, group string spacing all may be used
To be decreased within 0.5mm.
Back contact solar cell component of the invention, through the foregoing embodiment in group string composition, eliminate busbar,
Group string spacing is small, and busbar and the area of terminal box occupied can be conserved on general components, reduce the ruler of component
It is very little to improving component efficiency.Than the area that general components save piece spacing, string spacing, increase the utilization rate of light, it is identical
The power i.e. component efficiency of dimensional conditions lower component greatly improve；By slice design, shorter welding length, without confluence
Item is lost so that the fill factor of component significantly improves, and further improves component power, terminal box can be located at component
Center.
The present invention also provides a kind of preparation method of the back contact solar cell component in above-described embodiment, including it is following
Step:
Step 11, multiple back contact solar cell group strings are chosen, back contact solar cell group string is above-described embodiment
Any one of described in back contact solar cell group string；
Step 12, by multiple back contact solar cell group strings in multiple lines and multiple rows and one or more layers arrangement；
Step 13, it is packaged after framing up；
Step 14, multiple back contact solar cell groups are series-parallel and summarize and be connected in terminal box, obtain back contacts
Solar cell module.
In some preferred embodiments,
In a step 11, back contact solar group string is the back contact solar that two the first battery units 21 are located at corner
Battery pack string,
In step 12, multiple back contact solar cell group strings are arranged in 2 row, 2 column multilayer, so that multiple first
Battery unit 21 is adjacent to each other to be located at the center of back contact solar cell component, and thus terminal box can be located at back and connect
Touch the center of solar cell module rather than edge.
In the preparation method of back contact solar cell component, the back contact solar cell group string of selection can be upper
Any one of embodiment is stated, multiple back contact solar cell group strings can be arranged in multiple lines and multiple rows, can symmetrically be arranged
Cloth, multiple back contact solar cell group strings are arranged in a plane in multiple lines and multiple rows and form one layer, can also be arranged in multiple
Multilayer is formed in plane.
Can by lamination, the module encapsulation techniques such as be laminated, frame up component is connected into an entirety, can will be in component
Group string on anode and the welding rod of cathode be aggregated into a positive electrode in component internal in form in parallel respectively and one negative
Electrode, and draw and be connected in terminal box, anode and cathode welding rod can also be directly connected to using new-type wiring, or using seperated
Formula terminal box reconnects after being separately connected two group strings or four group strings, and terminal box can be located at back contact solar cell group
The center of part rather than edge, obtain back contact solar cell component.
Back contact solar cell component can be prepared by the above method, the system of the back contact solar cell component
Preparation Method is simple, reduces component area, saves assembly material, convenient for group string and the connection of terminal box, the filling of lifting assembly because
Son, the electric energy loss of reduction group string, the efficiency of raising group string reduce costs, and are assembled into efficient back by the group string
Contact solar cell component can be applied directly in large-scale production without being improved too much existing subassembly line.
Unless otherwise defined, technical term or scientific term used in the present invention are should be in fields of the present invention
The ordinary meaning that personage with general technical ability is understood." first ", " second " used in the present invention and similar word
It is not offered as any sequence, quantity or importance, and is used only to distinguish different component parts.Equally, "one" or
The similar word such as " one " does not indicate that quantity limits yet, but indicates that there are at least one." connection " or " connected " etc. are similar
Word is not limited to physics or mechanical connection, but may include electrical connection, it is either direct or between
It connects."upper", "lower", "left", "right" etc. are only used for indicating relative positional relationship, when the absolute position for being described object changes
Afterwards, then the relative positional relationship also correspondingly changes.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of back contact solar cell group string, which is characterized in that including multiple back contact solar cell units, Mei Gesuo
The back side for stating back contact solar cell unit is equipped with more positive-electrode fine grid lines and the superfine grid line of negative electricity, the positive-electrode fine grid
Line is parallel to each other and is arranged alternately with the superfine grid line of the negative electricity, is in alignment with each other between the more positive-electrode fine grid lines and more
Be in alignment with each other between the superfine grid line of negative electricity, one end of the positive-electrode fine grid line relative to the superfine grid line of the negative electricity one
End is that the other end of jag and the superfine grid line of the negative electricity relative to the other end of the positive-electrode fine grid line is jag；
Multiple back contact solar cell units are arranged in multiple lines and multiple rows, correspondingly the back of adjacent rows and adjacent column
The jag of the positive-electrode fine grid line of contact solar cell unit row alternate with the jag of the superfine grid line of the negative electricity
Cloth；
The series connection of the back contact solar cell unit of each back contact solar cell unit and row adjacent thereto,
And/or and column adjacent thereto the back contact solar cell unit series connection, make the back contact solar cell group string shape
At current path；Also, in the outermost two neighboring back contact solar for being located at the back contact solar cell group string
The neighboring edge of battery unit forms anode and cathode.
2. back contact solar cell group string according to claim 1, which is characterized in that
The back contact solar cell unit includes the first battery unit and the second battery unit,
First battery unit be two, two first battery units be located at outermost a line and adjacent to each other, two
First battery unit only connect with not formed at its respectively by the back contact solar cell unit adjacent with one side
Concatenated opposite side is respectively formed anode and cathode,
Two respectively in the back contact solar cell unit adjacent thereto of second battery unit are connected in series.
3. back contact solar cell group string according to claim 2, which is characterized in that two first battery units
Positioned at corner.
4. back contact solar cell group string according to claim 2, which is characterized in that the anode connects institute by welding rod
It states positive-electrode fine grid line to be formed, the cathode connects the thin grid line of the back electrode by welding rod and formed.
5. back contact solar cell group string according to claim 2, which is characterized in that multiple back contact solars
Battery unit is arranged into 2M row × 2N column, and the M and N are separately the integer more than or equal to 2.
6. back contact solar cell group string according to claim 5, which is characterized in that
Back contact solar cell unit described in 1st row is serially connected between any two,
1st row and the 2nd row, the 3rd row and the 4th row, until between 2M-1 row and 2M row, described in two of outermost column
It is serially connected between back contact solar cell unit, in addition to the back contact solar cell unit described in the 1st row, described in every row
Among back contact solar cell unit, in addition to being located between the 1st column and the back contact solar cell unit of the 2nd column not
Remaining connects with the adjacent back contact solar cell unit except connection,
It is described to be located at the 1st column among back contact solar cell unit described in every row and other than the 1st row and last line
With the 2nd column the back contact solar cell unit respectively with the back contact solar cell unit string of its next line
Connection.
7. back contact solar cell group string according to claim 5, which is characterized in that
Back contact solar cell unit described in 1st row is serially connected between any two,
3rd column and the 4th arrange, until 2N-1 is arranged between 2N column, positioned at two back contact solar electricity of 2M row
Be serially connected between pool unit, the 2nd column and the 3rd column, until 2N-2 and 2N-1 column between, described in two of the 2nd row
It is serially connected between back contact solar cell unit,
Positioned at the 1st column with 2N column the back contact solar cell unit respectively with the MWT solar energy of its next line
Battery cells in series,
Other than the 1st column are with 2N column and other than the 1st row, the MWT solar battery cell in each column respectively with
The MWT solar battery cell of its next line is connected.
8. a kind of preparation method of such as described in any item back contact solar cell group strings of claim 1-7, which is characterized in that
The following steps are included:
Step S1, obtains multiple back contact solar cell units, and the back side of each back contact solar cell unit is set
Have more positive-electrode fine grid lines and the superfine grid line of negative electricity, the positive-electrode fine grid line and the superfine grid line of the negative electricity be parallel to each other and
It is arranged alternately, is in alignment with each other between the more positive-electrode fine grid lines and is in alignment with each other between the more superfine grid lines of negative electricity,
One end of the positive-electrode fine grid line is jag and the superfine grid line of the negative electricity relative to one end of the superfine grid line of the negative electricity
The other end relative to the positive-electrode fine grid line the other end be jag；
Step S2 arranges multiple back contact solar cell units in multiple lines and multiple rows, correspondingly adjacent rows and adjacent
The jag of the positive-electrode fine grid line of the back contact solar cell unit of column and dashing forward for the superfine grid line of the negative electricity
Outlet interphase distribution；
Step S3, by the back contact solar cell list of each back contact solar cell unit and row adjacent thereto
Member series connection, and/or and column adjacent thereto back contact solar cell unit series connection, make back contact solar electricity
Pond group string forms current path；And it is being located at the outermost two neighboring back contacts of the back contact solar cell group string too
The neighboring edge of positive energy battery unit forms anode and cathode, obtains the back contact solar cell group string.
9. a kind of back contact solar cell component, which is characterized in that connect including back such as of any of claims 1-7
Touch solar battery group string.
10. back contact solar cell component according to claim 9, which is characterized in that the back contact solar electricity
Pond component includes multiple back contact solar cell group strings, and multiple back contact solar cell group strings are more in multirow
Column and one or more layers arrange, multiple back contact solar cell groups are series-parallel and summarize and be connected in terminal box.
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