CN209104167U - The direct-connected solar cell module of single side - Google Patents

Abstract

The utility model discloses a kind of direct-connected solar cell modules of single side, including the first solar battery sheet；First solar battery sheet includes the first front electrode and the first back surface field, first front electrode, the first back surface field are equipped with lateral main grid, at least one of the lateral front main grid of first front electrode, lateral back side main grid of the first back surface field are equipped with contact, and the contact is set to the end of lateral main grid；The long side of adjacent solar battery sheet is overlapped, and forms face contact；Adjacent solar battery sheet is connected by common contact, and forms battery strings by sintering.Using the utility model, structure is simple, and gap is small between cell piece, reduces the power loss of welding, and the high reliablity of battery component, and photoelectric conversion efficiency is high.

Description

The direct-connected solar cell module of single side

Technical field

The utility model relates to area of solar cell more particularly to a kind of direct-connected solar cell modules of single side.

Background technique

Conventional crystalline silicon component cell piece all uses metal welding band connection substantially.There are three obvious for this connection type Defect: first is that metal welding band and cell piece gap occupy the positive light-receiving area of component；Second is that there are line losses for metal welding band；Third is that Welding is expanded with heat and contract with cold by the temperature change period is easy to happen fracture and corrosion, these three modes are to the transfer efficiency of component and property Stabilizability has large effect.

Utility model content

Technical problem to be solved by the utility model is to provide a kind of direct-connected solar cell module of single side, structures Simply, gap is small between cell piece, reduces the power loss of welding, and the high reliablity of battery component, and photoelectric conversion efficiency is high.

In order to solve the above-mentioned technical problem, the utility model provides a kind of direct-connected solar cell module of single side, including At least two solar battery sheets, the solar battery sheet stack gradually arrangement, form battery strings, the solar battery sheet Including at least the first solar battery sheet；

First solar battery sheet include the first front electrode and the first back surface field, first front electrode, First back surface field is equipped with lateral main grid, lateral front main grid, the transverse direction of the first back surface field of first front electrode At least one of back side main grid is equipped with contact, and the contact is set to the end of lateral main grid；

The long side of adjacent solar battery sheet is overlapped, and forms face contact；

Adjacent solar battery sheet is connected by common contact, and forms battery strings by sintering.

As the preferred embodiment of above scheme, the solar battery sheet is to pass through pretreated full wafer silicon wafer.

As the preferred embodiment of above scheme, the pretreatment successively includes: to form flannelette, expansion in the front of full wafer silicon wafer It dissipates and forms PN junction, doping, polished backside, positive backside deposition passivating film, back side fluting.

As the preferred embodiment of above scheme, the lateral front main grid of first front electrode is equipped with contact, described Contact is set to the end of lateral front main grid；

The contact of the lateral front main grid of each solar battery sheet is set to the back side of preceding a piece of solar battery sheet, and preceding The lateral back side main grid of a piece of solar battery sheet connects.

As the preferred embodiment of above scheme, the contact is circular contact, rectangular contacts, regular polygon contact or linear Contact.

As the preferred embodiment of above scheme, the solar battery sheet further includes the second solar battery sheet, and second too Positive energy cell piece includes the second front electrode and the second back surface field, and second front electrode, the second back surface field are equipped with Lateral main grid, at least one of second front electrode, second back surface field are equipped with longitudinal main grid, the longitudinal direction main grid with Lateral main grid connection.

As the preferred embodiment of above scheme, the solar battery sheet includes the second solar battery sheet A, second sun It can cell piece B and the first solar battery sheet；

The front electrode of the second solar battery sheet A include a plurality of lateral front main grid, 1 longitudinal front main grid and The a plurality of secondary grid in front, back surface field are equipped with a plurality of lateral back side main grid；

The front electrode of the second solar battery sheet B includes the secondary grid of a plurality of lateral front main grid and a plurality of front, institute The end for stating lateral front main grid is equipped with contact, and back surface field is equipped with a plurality of lateral back side main grid, 1 longitudinal back side main grid；

The front electrode of first solar battery sheet includes a plurality of lateral front main grid, is set to lateral front main grid end The secondary grid in the contact in portion and a plurality of front, back surface field are equipped with a plurality of lateral back side main grid；

Second solar battery sheet A, the first solar battery sheet, the second solar battery sheet B stack gradually connection.

As the preferred embodiment of above scheme, the width of the contact is at least bigger by 20% than the width of lateral main grid.

Implement the utility model, has the following beneficial effects:

The utility model provides a kind of direct-connected solar cell module of single side, including at least two solar battery sheets, too Positive energy cell piece is to pass through pretreated full wafer silicon wafer, and the long side of adjacent solar battery sheet is overlapped, and forms face contact；And Adjacent solar battery sheet is connected by common contact, and forms battery strings by sintering, is had the advantage that

1, in each battery strings, solar battery sheet is arranged by the way of the stacking of front and back, and positive rear electrode passes through touching Point is directly connected to, and surface does not have a metal welding band, also very close to each other between cell piece, takes full advantage of face workable for assembly surface Product, reduces the line loss of conventional metals welding, therefore greatly improves the transfer efficiency of component；

2, traditional metal welding band connection mode is line connection, and the utility model component is then face connection, is effectively promoted Attachment force between cell piece, keeps the component more reliable；

3, it is connected, is replaced between conventional batteries by common contact between adjacent full wafer inside the utility model battery strings Welding connection, does not need to be sliced, and save the connection of welding, enormously simplifies the manufacturing process of single sided assemblies, reduce equipment at Sheet and production cost；

4, it is connected between the adjacent full wafer of the utility model by common contact, compared with the mode of conductive glue connection, is reduced Series resistance and resistance loss, are obviously improved the power of single sided assemblies；

5, contact between the adjacent full wafer of the utility model can form battery strings by sintering, i.e., the system of battery strings Standby technique incorporates in conventional solar cells manufacturing process, and gap is small between further cell piece, reduces the power loss of welding；

6, the process flow of the utility model is relatively simple, and each processing step is all more mature, and incorporates commonly too In positive energy battery manufacturing process, the probability to malfunction in manufacturing process is reduced, the reliability of product is increased.

Detailed description of the invention

Fig. 1 is the positive structure schematic of the first solar battery sheet of the utility model；

Fig. 2 is the structure schematic diagram of the first solar battery sheet of the utility model；

Fig. 3 is schematic diagram of the utility model component first embodiment in lamination process；

Fig. 4 is the positive structure schematic of the utility model component first embodiment；

Fig. 5 is the structure schematic diagram of the utility model component first embodiment；

Fig. 6 is the sectional view of component shown in Fig. 3；

Fig. 7 is the positive structure schematic of the second solar battery sheet of the utility model A；

Fig. 8 is the structure schematic diagram of the second solar battery sheet of the utility model A；

Fig. 9 is the positive structure schematic of the second solar battery sheet of the utility model B；

Figure 10 is the structure schematic diagram of the second solar battery sheet of the utility model B；

Figure 11 is schematic diagram of the utility model component second embodiment in lamination process；

Figure 12 is the positive structure schematic of the utility model component second embodiment；

Figure 13 is the structure schematic diagram of the utility model component second embodiment；

Figure 14 is the sectional view of the utility model component second embodiment；

Figure 15 is the flow chart of the preparation method of the direct-connected solar cell module of the utility model single side.

Specific embodiment

It is practical new to this below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer Type is described in further detail.

The utility model provides a kind of direct-connected solar cell module of single side comprising at least two solar batteries Piece, the solar battery sheet stack gradually arrangement, form battery strings.The solar battery sheet of the utility model includes at least the One solar battery sheet.

As shown in Figure 1, 2, the first solar battery sheet 1A includes the first front electrode and the first back surface field, described First front electrode, the first back surface field are equipped with lateral main grid, the lateral front main grid of first front electrode, the first back At least one of lateral back side main grid of face electric field is equipped with contact, and the contact is set to the end of lateral main grid.

Specifically, there are many embodiments for the electrode of shown first solar battery sheet, comprising:

(1) front electrode of the first solar battery sheet 1A includes a plurality of lateral front main grid 11, is set to laterally just The secondary grid 13 in the contact 111 of 11 end of face main grid and a plurality of front；Back surface field 16 is equipped with a plurality of lateral back side main grid 14, Fig. 1,2 Shown in embodiment belong to situation in (1).

(2) front electrode of first solar battery sheet includes the secondary grid of a plurality of lateral front main grid and a plurality of front； Back surface field is equipped with a plurality of lateral back side main grid, set on the contact of lateral back side main grid end；

(3) front electrode of first solar battery sheet includes a plurality of lateral front main grid, is set to laterally front master The secondary grid in the contact in grid end portion and a plurality of front；Back surface field is equipped with a plurality of lateral back side main grid, is set to lateral back side main grid end Contact.

That is, the lateral front main grid of the first front electrode is equipped with the lateral back side main grid of contact or the first back surface field The lateral back side main grid of lateral front main grid, the first back surface field equipped with contact or the first front electrode is equipped with contact.

Preferably, the contact 111 is circular contact, rectangular contacts, regular polygon contact or linear contact.It is described linear Contact may include the linear of variform, such as straight line, curve, camber line etc..

It should be noted that the contact may be arranged as other shapes, such as diamond shape in addition to above-mentioned shape, half Circle or other irregular shapes, embodiment are not limited to the utility model illustrated embodiment.

It should be noted that the main grid of the utility model and secondary grid can be the forms such as straight line, segmentation, curve, laser is cut Secant is also possible to straight line or curve, and is not limited thereto.It, can be with moreover, the utility model is other than main grid, secondary grid Equipped with spine, the embodiment multiplicity of the solar cell module, the utility model embodiment is not limited to lift real Apply example.

As shown in figure 3, the utility model is during being laminated arrangement, adjacent solar battery sheet 1 passes through common contact 111 connections, the contact 111 of the lateral front main grid of each solar battery sheet 1 are set to the back of preceding a piece of solar battery sheet 1 Face is connect with the lateral back side main grid 14 of preceding a piece of solar battery sheet 1.

In each battery strings, solar battery sheet is arranged by the way of the stacking of front and back, and positive rear electrode passes through contact It being directly connected to, surface does not have a metal welding band, and it is also very close to each other between cell piece, area workable for assembly surface is taken full advantage of, The line loss of conventional metals welding is reduced, therefore greatly improves the transfer efficiency of component；

Traditional metal welding band connection mode is line connection, and the utility model component is then face connection, is effectively improved Attachment force between cell piece keeps component more reliable.

As shown in Fig. 4, Fig. 5, Fig. 6, the long side of adjacent solar battery sheet 1 is overlapped, and forms face contact 20；It is adjacent too Positive energy cell piece 1 is connected by common contact 111, and forms battery strings 10 by sintering.

The full wafer silicon wafer of the industry, general length and width are equal, and size is mostly 156 ± 2mm, and the utility model uses full wafer silicon wafer Stacking, simple and convenient, high production efficiency.

It is connected between adjacent full wafer by common contact inside the utility model battery strings, replaces the weldering between conventional batteries Band connection does not need to be sliced, and saves the connection of welding, enormously simplifies the manufacturing process of single sided assemblies, reduces equipment cost And production cost.

It is connected between the adjacent full wafer of the utility model by common contact, compared with the mode of conductive glue connection, is reduced Series resistance and resistance loss are obviously improved the power of single sided assemblies.

Contact between the adjacent full wafer of the utility model can form battery strings by sintering, i.e., the preparation of battery strings Technique incorporates in conventional solar cells manufacturing process, and gap is small between further cell piece, reduces the power loss of welding.

The battery strings 10 of the utility model can be set to a row or multi-row battery strings, the solar-electricity of every row's battery strings 10 Pass through series connection between pond piece 1.And when battery strings 10 are set as multiple rows of, the solar battery sheets 1 of single battery strings 10 it Between pass through series connection；Pass through the connection of in parallel or other modes, connection type multiplicity, this reality between difference row's battery strings 10 It is defined with novel not to this.Preferably, it is connected in parallel or series between different row's battery strings 10 by welding.

As shown in FIG. 6 to 13, the utility model additionally provides the second embodiment of the direct-connected solar cell module of single side, this When further include second solar battery sheet；

As shown in Fig. 7 and Fig. 8, Fig. 9 and Figure 10, second solar battery sheet includes the second front electrode and the second back Face electric field, second front electrode, the second back surface field are equipped with lateral main grid, second front electrode, second back side At least one of electric field is equipped with longitudinal main grid, and the longitudinal direction main grid is connect with lateral main grid.

Specifically, there are many embodiments for the electrode of shown second solar battery sheet, comprising:

(1) as shown in Figure 7 and Figure 8, the front electrode of the second solar battery sheet 1B includes that a plurality of laterally front is main The secondary grid 13 of grid 11,1 longitudinal front main grids 12 and a plurality of front, back surface field 16 are equipped with a plurality of lateral back side main grid 14, name For the second solar battery sheet A；

(2) as shown in Figure 9 and Figure 10, the front electrode of the second solar battery sheet 1C includes that a plurality of laterally front is main The secondary grid 13 of grid 11 and a plurality of front, the end of the transverse direction front main grid 11 are equipped with contact 111, and back surface field 16 is equipped with a plurality of cross Rearwardly 14,1 longitudinal back side main grids 15 of main grid, are named as the second solar battery sheet B.

As illustrated in figs. 11-14, the battery strings 10 of the utility model can be set to a row or multi-row battery strings, every row's battery String includes a second solar battery sheet 1B, the first solar battery sheet 1A of one or more and second solar battery Piece 1C, the second solar battery sheet 1B, the first solar battery sheet 1A, the second solar battery sheet 1C stack gradually connection.The Two solar battery sheet 1B, the second solar battery sheet 1C longitudinal main grid be used as battery strings positive and negative anodes.

During arrangement is laminated, adjacent solar battery sheet 1 is connected the utility model by common contact 111, often The contact 111 of the lateral front main grid of one solar battery sheet 1 is set to the back side of preceding a piece of solar battery sheet 1, and preceding a piece of The lateral back side main grid 14 of solar battery sheet 1 connects.The long side of adjacent solar battery sheet 1 is overlapped, and forms face contact 20； Adjacent solar battery sheet 1 is connected by common contact 111, and forms battery strings 10 by sintering.

Pass through series connection between the solar battery sheet 1 of every row's battery strings 10.And when battery strings 10 are set as multiple rows of, Pass through series connection between the solar battery sheet 1 of single battery strings 10；Between difference row's battery strings 10 by it is in parallel or its He connects mode, and connection type multiplicity, the utility model is defined not to this.Preferably, between different row's battery strings 10 Connect longitudinal main grid in parallel or series by welding, connection is simple, highly reliable.

Further, the difference embodiment in conjunction with shown in Fig. 1-14, the solar battery sheet 1 is by pretreated Full wafer silicon wafer.It is described pretreatment successively include: full wafer silicon wafer front formed flannelette, diffuse to form PN junction, doping, the back side throw Light, positive backside deposition passivating film, back side fluting.

The utility model incorporates the preparation process of battery strings in conventional solar cells manufacturing process, in regular solar The lamination that battery strings can be completed before the sintering step of battery, finally by once sintered, so that it may realize battery strings It connects, gap is small between further cell piece, reduces the power loss of welding

The process flow of the utility model is relatively simple, and each processing step is all more mature, and incorporates the common sun In energy battery manufacturing process, the probability to malfunction in manufacturing process is reduced, the reliability of product is increased.

Preferably, the width of the contact 111 is at least bigger by 20% than the width of lateral main grid.When the width of the contact 111 When degree bigger than the width of lateral main grid 20%, it is ensured that adjacent solar battery sheet passes through the connected stabilization of lateral main grid Property, reduce series resistance and resistance loss.When the width of contact 111 greatly to certain proportion when, contact 111 and contact 111 it Between be connected, form a longitudinal main grid.

More preferably, the width of the contact 111 is 20-50% bigger than the width of lateral main grid, it is ensured that the adjacent sun Energy cell piece 1 passes through the connected stability of lateral main grid, reduces series resistance and resistance loss, is obviously improved the function of component Rate.Moreover, it is also possible to save the slurry of overlapping region, make with the implementation of lower cost.When the width of contact is than lateral main grid When the big 20-50% of width, series resistance and resistance loss can be additional to reduce under the premise of the utility model base case 25%.

Correspondingly, a kind of preparation method of direct-connected solar cell module of single side is also disclosed in the utility model, such as Figure 15 institute Show, comprising:

S101, it is pre-processed in silicon wafer, and prints front electrode, back surface field and back side main grid in silicon chip surface, obtained To solar battery sheet.

Specifically, printing front electrode, back surface field and back side main grid in silicon wafer according to the design of electrode.

S102, solar battery sheet is laminated to arrangement one by one, adjacent solar battery sheet contact connection forms battery String, and dry.

As shown in figure 3, the utility model is during being laminated arrangement, adjacent solar battery sheet 1 passes through common contact 111 connections, the contact 111 of the lateral front main grid of each solar battery sheet 1 are set to the back of preceding a piece of solar battery sheet 1 Face is connect with the lateral back side main grid 14 of preceding a piece of solar battery sheet 1.

S103, high temperature sintering is carried out to battery strings, makes slurry curing.

S104, battery strings are carried out with anti-LID annealing, after stepping test, is packaged into component.

It should be noted that anti-LID annealing just refers to anti-photoluminescence decaying annealing.

After stepping test, by the cell package of identical gear to the same component, guarantee component Maximum Power Output and Guarantee the stability of power output.

Further, described pre-process includes:

(1.1) flannelette is formed in front side of silicon wafer；

The silicon wafer can select P-type silicon or N-type silicon.

(1.2) high square resistance diffusion is carried out in front side of silicon wafer, forms PN junction；

Sheet resistance is generally preferred to 80-200 Ω/, but not limited to this.

(1.3) selective laser doping is carried out to front side of silicon wafer；

Laser doping pattern needs are corresponding with subsequent front electrode pair gate pattern, use prior art design i.e. It can.

(1.4) by-product and periphery P N knot that removal diffusion process is formed, and silicon chip back side is polished；

N-type silicon is formed in front side of silicon wafer according to phosphorus diffusion, by-product is phosphorosilicate glass；

Front side of silicon wafer is diffused according to boron and forms P-type silicon, and by-product is Pyrex.

(1.5) passivating film and protective film are deposited in silicon chip back side；

The passivating film is preferably silicon dioxide film, di-aluminium trioxide film or silicon nitride film, and protective film preferably nitrogenizes Silicon fiml, silicon oxynitride film, silicon dioxide film or the composite membrane being made of above-mentioned film, but not limited to this.

(1.6) passivating film and antireflective film are deposited in front side of silicon wafer；

The passivating film is preferably silicon dioxide film, di-aluminium trioxide film or silicon nitride film；The antireflective film is preferably nitrogen SiClx film or silicon dioxide film, but not limited to this.

(1.7) laser slotting is carried out to the passivating film of silicon chip back side and protective film.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model rather than to this realities With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is common It will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this reality With the spirit and scope of new technique scheme.

Claims (7)

1. a kind of direct-connected solar cell module of single side, including at least two solar battery sheets, the solar battery sheet according to Secondary stacking arrangement, forms battery strings, which is characterized in that the solar battery sheet includes the first solar battery sheet；

First solar battery sheet includes the first front electrode and the first back surface field, first front electrode, first Back surface field is equipped with lateral main grid, the lateral back side of the lateral front main grid of first front electrode, the first back surface field At least one of main grid is equipped with contact, and the contact is set to the end of lateral main grid；

The long side of adjacent solar battery sheet is overlapped, and forms face contact；

Adjacent solar battery sheet is connected by common contact, and forms battery strings by sintering；

The width of the contact is 20-50% bigger than the width of lateral main grid.

2. the direct-connected solar cell module of single side as described in claim 1, which is characterized in that the solar battery sheet is to pass through Pretreated full wafer silicon wafer.

3. the direct-connected solar cell module of single side as claimed in claim 2, which is characterized in that it is described pretreatment successively include: The front of full wafer silicon wafer forms flannelette, diffuses to form PN junction, doping, polished backside, positive backside deposition passivating film, back side fluting.

4. the direct-connected solar cell module of single side as described in claim 1,2 or 3, which is characterized in that first front electrode Lateral front main grid be equipped with contact, the contact is set to the end of lateral front main grid；

The contact of the lateral front main grid of each solar battery sheet is set to the back side of preceding a piece of solar battery sheet, and preceding a piece of The lateral back side main grid of solar battery sheet connects.

5. the direct-connected solar cell module of single side as claimed in claim 4, which is characterized in that the contact is circular contact, square Shape contact, regular polygon contact or linear contact.

6. the direct-connected solar cell module of single side as described in claim 1, which is characterized in that the solar battery sheet further includes Second solar battery sheet, the second solar battery sheet include the second front electrode and the second back surface field, second front Electrode, the second back surface field are equipped with lateral main grid, and at least one of second front electrode, second back surface field are equipped with Longitudinal main grid, the longitudinal direction main grid are connect with lateral main grid.

7. the direct-connected solar cell module of single side as claimed in claim 6, which is characterized in that the solar battery sheet includes the Two solar battery sheet A, the second solar battery sheet B and the first solar battery sheet；

The front electrode of the second solar battery sheet A includes a plurality of lateral front main grid, 1 longitudinal front main grid and a plurality of Positive pair grid, back surface field are equipped with a plurality of lateral back side main grid；

The front electrode of the second solar battery sheet B includes the secondary grid of a plurality of lateral front main grid and a plurality of front, the cross It is equipped with contact to the end of front main grid, back surface field is equipped with a plurality of lateral back side main grid, 1 longitudinal back side main grid；

The front electrode of first solar battery sheet includes a plurality of lateral front main grid, set on lateral front main grid end The secondary grid in contact and a plurality of front, back surface field are equipped with a plurality of lateral back side main grid；

Second solar battery sheet A, the first solar battery sheet, the second solar battery sheet B stack gradually connection.