CN204905273U

CN204905273U - Solar cell unit, battery piece array, battery pack

Info

Publication number: CN204905273U
Application number: CN201520280778.2U
Authority: CN
Inventors: 赵志强; 姜占锋; 何龙
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2015-04-30
Filing date: 2015-04-30
Publication date: 2015-12-23
Anticipated expiration: 2025-04-30

Abstract

The utility model discloses a solar cell unit, solar cell piece array, solar cell subassembly, the solar cell unit, include: battery piece, battery piece include battery piece base member and establish a plurality of pairs of grid lines on the front of battery piece base member that vice grid line is greater than the width of middle pair grid line including being close to the marginal marginal vice grid line of battery piece base member with the vice grid line in the centre that lies in marginal pair of grid line inboard, the width of at least one edge pair grid line, a plurality of conductor wires, a plurality of conductor wires separate the setting each other, and the conductor wire is crossing and continuous with vice grid line with vice grid line. According to the solar cell unit of this application embodiment, set the width that is greater than middle vice grid line to through the width with the vice grid line in edge for the vice grid line in edge is bigger with the joint strength of conductor wire, and have bigger and the connection zone that the conductor wire links to each other, and being connected between be convenient for conductor wire and the edge pair grid line.

Description

Solar battery cell, cell piece array, battery component

Technical field

The application relates to area of solar cell, relates to solar battery cell, solar cell chip arrays, solar module and preparation method thereof particularly.

Background technology

Solar module is one of vitals of device of solar generating.Sunlight is from the front illuminated of cell piece to cell piece, cell piece comprises cell piece and the main gate line be located on cell piece front and secondary grid line, the part in the front of main gate line and secondary grid line clad battery sheet, a part of sunlight can be blocked thus, the solar energy impinged upon on main gate line and secondary grid line cannot be transformed into electric energy, therefore, need main gate line and secondary grid more thin better.But the effect of main gate line and secondary grid line is conduction current, from the angle of resistivity, main gate line and secondary grid line more detailed rules and regulations conduction cross-sectional area are less, and ohmic loss is larger.Therefore main gate line and secondary grid line design need to average out between shading and conduction, will consider cost simultaneously.

In correlation technique, the front of solar battery sheet is provided with main gate line and secondary grid line usually, for deriving the electric current that cell piece is produced by photoelectric effect or Photochemical effects.In order to improve the efficiency of cell piece, current solar breeder commercial city is being devoted to study the quantity how improving main gate line.Successful in prior art main grid is brought up to 3 from 2, be even increased to 5.

But in prior art, main gate line is that the slurry being expensive silver by printing main component is prepared from, and therefore, its preparation cost is very high, and the radical increasing silver-colored main gate line must cause the increase of cost.Meanwhile, the width large (such as, width reaches more than 2mm) of existing silver-colored main gate line, the radical increasing silver-colored main gate line also can increase to shading-area, causes the conversion efficiency of cell piece to reduce.

Therefore, from reducing costs, the angle reducing shading-area is set out, and in correlation technique, the script silver-colored main gate line be printed on cell piece is replaced with wire, as copper wire, welded by copper wire with secondary grid line, and then copper wire is as conductor wire derived current.Owing to not re-using silver-colored main gate line, its cost can significantly reduce, and simultaneously because the diameter of copper wire is less, can reduce shading-area, therefore, further the quantity of conductor wire can be risen to 10.This cell piece can be called dereliction grid cell sheet.Wherein, wire substituted for silver-colored main grid in conventional solar cell sheet and welding.

Present inventor finds through long-term research experiment, pulls out many parallel wires simultaneously, then cut off by many one metal wires, be more fixedly soldered on cell piece by many one metal wires simultaneously if adopted.This kind of mode is due to equipment and the restriction preparing precision, technique etc., such as due to the effect of stress, when solar battery sheet is placed in a free state, have certain bending, therefore (experiment proves to need wire to keep certain rate of tension cell piece could be flattened, concerning the copper wire of string diameter 0.2mm, its minimum tensile force at least will have 2N).For keeping this tensile force, need the device that similar clip is set at every one metal wire two ends, this device needs to take certain space, and the space of cell piece is limited, therefore, can only pull out on a cell piece at most at present in prior art simultaneously and fix the wire of welding about 10, then it is very difficult to increase radical wiry.Because wire radical is more, its free end is more, and equipment needs to control more wire simultaneously, and this requires very high to wire-drawing equipment.Meanwhile, the limited space of solar battery sheet, such as, general single battery sheet is of a size of 156mm*156mm, needs accurately to control many one metal wires in so limited space simultaneously, and this is very high to equipment requirement, especially very high to required precision.Therefore in current actual production, can not control preferably simultaneously and weld many one metal wires, the radical of the conductor wire that can increase be still limited, and generally maximum only have about 10, and realizes difficulty.

In order to address this problem, prior art (US20100275976, and US20100043863) proposes a kind of technical scheme be fixed on by many one metal wires on transparent film layer.That is, first many parallel wires are fixed on transparent film layer by the mode of bonding, then fit on cell piece by being bonded with many parallel hyaline membranes wiry, finally by laminating technology, wire being contacted with the secondary grid line on cell piece.The program fixes many one metal wires by transparent film layer, solve the problem simultaneously controlling many one metal wires, radical wiry can be increased further, but this scheme has almost abandoned welding procedure, namely wire is not connected with secondary grid line by welding procedure, but wire is contacted by laminating technology with secondary grid line, thus derived current.

Although this scheme can promote radical wiry further, due to the existence of transparent film layer, the absorption of light can be affected, cause certain shading, thus cause the reduction of conversion efficiency.

The more important thing is, the scheme of this employing transparent film layer fixing metal silk cannot adopt welding procedure connection metal silk and secondary grid line.This is because on the one hand, if adopt welding procedure, the fusion temperature of transparent film layer must higher than welding temperature (welding temperature be generally at about 140 DEG C).Otherwise if the fusion temperature of transparent film layer is lower than welding temperature, when welding, adhesive film can melt, thus loses the effect of its fixing metal silk, and wire can drift about, and greatly reduces welding effect.But on the other hand, as well known to those skilled in the art, solar battery sheet needs to be in sealing state in use, to prevent water, air etc. from entering in cell piece, cause producing burn into short circuit etc.; And existing encapsulating material is generally EVA, its fusing point is generally 70-80 DEG C, well below welding temperature; If employing welding procedure, as mentioned above, the fusion temperature of transparent film layer needs higher than welding temperature, it is inevitable also higher than the fusing point of encapsulating material, therefore when encapsulation, under package temperature, encapsulating material (EVA) melts, and transparent film layer can not melt, thus, when encapsulating, the encapsulating material of fusing is cannot through the adhesive film of solid, thus cell piece is sealed up completely, therefore, the non-constant of its sealing effectiveness, actual product is easy to lose efficacy.Therefore, from the angle of encapsulation, need again the fusion temperature of transparent film layer lower than welding temperature, this is obviously an antinomy.

Therefore, the scheme of this employing adhesive film fixing metal silk cannot adopt welding procedure wire and secondary grid line to be welded together, and its wire only actually just contacts with the secondary grid line on cell piece, that is, wire just rides on secondary grid line.Therefore, the bonding strength of wire and secondary grid line is very low, in lamination process or in use procedure, is very easy to depart from, causes loose contact, thus cause the efficiency of cell piece significantly to reduce, or even lost efficacy between wire and secondary grid line.Therefore, inreal being promoted and commercialization of the product of this scheme is adopted.Therefore, unripe in the market dereliction grid solar cell.

In addition, in existing dereliction grid solar cell sheet, the part that wire extends cell piece need be connected with other cell pieces or load, the wire extended can be subject to the effect of external force in use procedure or handling process, such as, collide, the situations such as vibrations, the part that wire is positioned at cell piece edge is very easy to depart from secondary grid line because of external force, cause loose contact, thus cause the efficiency of cell piece significantly to reduce, or even lost efficacy.More particularly wire is thinner, also there is larger shrinkage stress in itself, also the secondary grid of wire and edge can be caused easily to peel off, the stripping of the secondary grid in edge also can affect the stripping of middle grid line, the peeling force that the peeling force that the connecting portion at edge is subject to is subject to relative to the connecting portion of inside is much larger, and the secondary grid line being positioned at edge then easily occurs connecting unstable situation.

The application is intended to one of solve the problems of the technologies described above at least to a certain extent.

Many main grids solar cell that the application proposes can commercialization, and preparation is simple and easy to realize, and particularly cost is low, and equipment is simple, can produce in batches.

For this reason, the application proposes a kind of solar battery cell, and this solar battery cell manufacture is simple, cost is low, and photoelectric conversion efficiency is high.

The application also proposes a kind of solar cell chip arrays, and this solar cell chip arrays manufacture is simple, cost is low, and photoelectric conversion efficiency is high.

The application also proposes a kind of solar module with above-mentioned solar cell chip arrays, and this solar module manufacture is simple, cost is low, and photoelectric conversion efficiency is high.

The application also proposes a kind of preparation method of above-mentioned solar module.

According to the solar battery cell of the application's first aspect embodiment, comprise: cell piece, described cell piece comprises cell piece matrix and is located at the multiple secondary grid line on the front of described cell piece matrix, the secondary grid line in edge that described secondary grid line comprises contiguous described cell piece matrix border and the secondary grid line in centre be positioned at inside the secondary grid line in described edge, the width of the secondary grid line at least one edge described is greater than the width of the secondary grid line in described centre; Multiple conductor wire, described multiple conductor wire is spaced apart from each other setting, and described conductor wire is crossing with described secondary grid line and be connected with described secondary grid line.

According to the solar battery cell of the embodiment of the present application, by the width of secondary for edge grid line is arranged to the width being greater than middle secondary grid line, make the bonding strength of the secondary grid line in edge and conductor wire larger, and there is the larger join domain be connected with conductor wire, be convenient to the connection between the secondary grid line of conductor wire and edge.

According to the solar cell chip arrays of the application's second aspect embodiment, comprise multiple solar battery cell, described solar battery cell is the solar battery cell according to above-described embodiment, is connected between the cell piece of adjacent cell by described conductor wire.

According to the solar module of the application's third aspect embodiment, comprise upper cover plate stacked successively, front adhesive film, cell piece array, back side adhesive film and backboard, described cell piece array is the solar cell chip arrays according to above-described embodiment.

According to the preparation method of the solar module of the application's fourth aspect embodiment, comprise: cell piece is provided, described cell piece comprises cell piece matrix and is located at the multiple secondary grid line on the front of described cell piece matrix, the secondary grid line in edge that described secondary grid line comprises contiguous described cell piece matrix border and the secondary grid line in centre be positioned at inside the secondary grid line in described edge, the width of the secondary grid line at least one edge described is greater than the width of the secondary grid line in described centre; The conductor wire be made up of wire is connected to obtain solar battery cell with described secondary grid line; Upper cover plate, front adhesive film, described solar battery cell, back side adhesive film and backboard are stacked successively, and make the front of described solar battery cell in the face of front adhesive film, make the back side of described solar battery cell in the face of back side adhesive film, then carry out lamination and obtain described solar module.

Utility model content

The application makes the discovery of the following fact and problem and understanding based on applicant:

Accompanying drawing explanation

Fig. 1 is the floor map of the solar cell chip arrays according to the application's embodiment.

Fig. 2 is the schematic cross-section of the longitudinal direction of solar cell chip arrays according to the application's embodiment.

Fig. 3 is the schematic cross-section of the transverse direction of solar cell chip arrays according to the application's embodiment.

Fig. 4 is the schematic diagram wiry for the formation of conductor wire according to the embodiment of the present application.

Fig. 5 is the floor map of the solar cell chip arrays according to another embodiment of the application.

Fig. 6 is the floor map of the solar cell chip arrays according to the another embodiment of the application.

Fig. 7 is the schematic diagram of the reciprocation extension wiry according to the embodiment of the present application.

Fig. 8 is the schematic diagram of two cell pieces of solar cell chip arrays according to the embodiment of the present application.

Fig. 9 is that two cell pieces shown in Fig. 8 are formed by connecting by wire the schematic diagram of solar cell chip arrays.

Figure 10 is the schematic diagram of the solar module according to the embodiment of the present application.

Figure 11 is the schematic partial cross-sectional view of solar module shown in Figure 10.

Figure 12 is the schematic diagram according to the application's solar cell chip arrays of an embodiment again.

Figure 13 is the structural representation of the secondary grid line of solar battery cell according to the application's embodiment.

Reference numeral:

Cell piece assembly 100;

Upper cover plate 10;

Front adhesive film 20;

Cell piece array 30; Cell piece 31; First cell piece 31A; Second cell piece 31B; Cell piece matrix 311; Secondary grid line 312; The secondary grid line 312A in front; The secondary grid line 312B in the back side; The secondary grid line 3121 in edge; Middle secondary grid line 3122; Weld part 3123; Back of the body electric field 313; Back electrode 314;

Conductor wire 32; Front side conductive line 32A; Back side conductor wire 32B; Wire 321; Weld layer 322; Short grid line 33;

Back side adhesive film 40;

Lower cover 50.

Embodiment

Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.

In this application, in order to clearly describe with being convenient to, below part term is made an explanation.

Term " battery unit " comprises cell piece 31 and conductor wire 32, and thus, conductor wire 32 also can be called the conductor wire 32 of battery unit.

Term " cell piece 31 " comprises cell piece matrix 311, the secondary grid line 312 be located on cell piece matrix 311 front, the back of the body electric field 313 being located at the back side of cell piece matrix 311 and the back electrode 314 be located on back of the body electric field 313, thus, secondary grid line 312 also can be called the secondary grid line 312 of cell piece 31, back of the body electric field 313 also can be called the back of the body electric field 313 of cell piece 31, and back electrode 314 also can be called the back electrode 314 of cell piece 31.

The intermediate products that " cell piece matrix 311 " such as can be obtained after the operations such as making herbs into wool, diffusion, etching edge, deposited silicon nitride layer by silicon chip, but it is to be appreciated that in the application, cell piece matrix 311 is not limited to be made up of silicon chip.

In other words, cell piece 31 comprises silicon chip, to the back of the body electric field 313 of some processing layers of silicon chip surface, the secondary grid line of sensitive surface and shady face and back electrode 314, or equivalent other class solar cells not having front electrode.

In this application, battery unit, cell piece 31 and cell piece matrix 311 are only used to be convenient to describe, and can not be interpreted as the restriction to the application.

" solar cell chip arrays 30 " is arranged by multiple cell piece to form, and in other words, arranged form by multiple cell piece 31 be connected by conductor wire 32.

In solar cell chip arrays 30, wire S forms the conductor wire 32 of cell piece, broad understanding should be made between the surface that wire S extends in adjacent cell sheet 31, wire S can extend between the surface of adjacent cell sheet 31, wire S can be connected with the secondary grid line 312 of cell piece 31, or wire S also can be connected with the back electrode 314 of another cell piece 31 with the secondary grid line 312 of a cell piece 31 in adjacent cell sheet 31, or a part of wire S is connected with the secondary grid line 312 of cell piece 31, remaining wire S is connected with the back electrode 314 of cell piece 31 simultaneously.

In other words, wire S can extend between the front of adjacent cell sheet 31, between the front that also can extend in a cell piece 31 in adjacent cell sheet 31 and the back side of another cell piece 31.When wire S extends between the front of a cell piece 31 in adjacent cell sheet 31 and the back side of another cell piece 31, conductor wire 32 can comprise extend in cell piece 31 front on and the front side conductive line 32A be electrically connected with the secondary grid line 312 of cell piece 31, and on the back side extending in cell piece 31 and the back side conductor wire 32B be electrically connected with the back electrode 314 of cell piece 31, the part of wire S between adjacent cell sheet 31 can be called connection conductor wire.

The all scopes disclosed in the application all comprise end points and can independently combine.The end points of the scope disclosed in the application and any value are all not limited to this accurate scope or value, and these scopes or value should be understood to the value comprised close to these scopes or value.

In this application, except as otherwise noted, directional terminology is as shown in the drawings upper and lower in " upper and lower " typically refers to; " front " refers to solar module one side towards light in application process, is also sensitive surface; " back side " refers to solar module one side back to light in application process.

Solar battery cell according to the embodiment of the present application is described below.

As shown in figure 1 to figure 13, cell piece 31 and conductor wire 32 is comprised according to the solar battery cell of the embodiment of the present application.The multiple secondary grid line 312 that cell piece 31 comprises cell piece matrix 311 and is located on the front of cell piece matrix 311, the secondary grid line 3121 in edge that secondary grid line 312 comprises adjacent cells sheet matrix 311 edge and the secondary grid line 3122 in centre be positioned at inside the secondary grid line 3121 in edge, the width of the secondary grid line 3121 at least one edge is greater than the width of middle secondary grid line 3122.Multiple conductor wire 32 is spaced apart from each other setting, and conductor wire 32 is crossing with secondary grid line 312 and be connected with secondary grid line 312.

In other words, solar battery cell according to the application is formed primarily of cell piece 31 and conductor wire 32, cell piece 31 is formed primarily of cell piece matrix 311 and secondary grid line 312, in this application, is described in detail by the secondary grid line 312 in the front to be located at cell piece matrix 311.

Wherein, secondary grid line 312 comprises the secondary grid line 3121 in edge and the secondary grid line 3122 in centre, the secondary grid line 3121 in edge is positioned on adjacent cells sheet matrix 311 marginal position, specifically can be positioned on the edge of the left and right sides of adjacent cells sheet matrix 311, middle secondary grid line 3122 is located between the secondary grid line 3121 in edge of cell piece matrix 311 both sides, and the width of the secondary grid line 3121 at least one edge is greater than the width of middle secondary grid line 3122.

In existing dereliction grid solar cell sheet, the part that wire extends cell piece need be connected with other cell pieces or load, the wire extended can be subject to the effect of external force in use procedure or handling process, such as collide, the situations such as vibrations, the part that wire is positioned at cell piece edge is very easy to depart from secondary grid line because of external force, causes loose contact, thus cause the efficiency of cell piece significantly to reduce, or even lost efficacy.More particularly wire is thinner, also there is larger shrinkage stress in itself, also the secondary grid of wire and edge can be caused easily to peel off, the stripping of the secondary grid in edge also can affect the stripping of middle grid line, the peeling force that the peeling force that the connecting portion at edge is subject to is subject to relative to the connecting portion of inside is much larger, and the secondary grid line being positioned at edge then easily occurs connecting unstable situation.

In addition, for the conductor wire adopting the reciprocal coiling of single metal wire, conductor wire is not be formed as straight line at the marginal position of cell piece matrix, but be formed as circular arc, " U " shape or other curved shapes, internal distortions stress wiry is larger, and the distance between the end points of every root conductor wire and the secondary grid line at cell piece edge has certain deviation, the secondary grid line of marginal position and the link position of conductor wire have uncertainty, also easily occur connecting unstable situation.

And according to the solar battery cell of the embodiment of the present application, secondary grid line 312 is divided into the secondary grid line 3121 in edge and centre secondary grid line 3122 two parts, and the width of secondary at least one edge grid line 3121 is arranged to the width being greater than middle secondary grid line 3122, the secondary grid line 3121 in conductor wire 32 and edge is made not only to have higher bonding strength, and the secondary grid line in edge 3121 and conductor wire 32 have larger can connection area, conductor wire 32 is easily welded with edge pair grid line 3121, reduces and connect unstable situation.

Thus, according to the solar battery cell of the embodiment of the present application, by the width of secondary for edge grid line 3121 is arranged to the width being greater than middle secondary grid line 3122, make the secondary grid line 3121 in edge larger with the bonding strength of conductor wire 32, and there is the larger join domain be connected with conductor wire 32, be convenient to the connection between the secondary grid line 3121 of conductor wire 32 and edge.

According to an embodiment of the application, secondary grid line 312 is also provided with the weld part 3123 for welding with conductor wire 32, the width of weld part 3123 on the direction being orthogonal to the secondary grid line 3121 in edge of the secondary grid line 3121 in edge is greater than the width of the weld part 3123 of middle secondary grid line 3122.

That is, as shown in figure 13, the live width of secondary grid line 312 in the position crossing with conductor wire 32 carries out widening treatment, this position on secondary grid line 312 as weld part 3123 for welding with conductor wire 32, weld part 3123 on secondary grid line 312 is carried out widening treatment, can so that secondary grid line 312 be welded with conductor wire 32, simultaneously, other positions of secondary grid line 312 can keep former live width, even reduce live width, while the welding effect ensureing secondary grid line 312 and conductor wire 32, shading-area can also be reduced.

Particularly, the width of the weld part 3123 of the secondary grid line 3121 in edge is greater than the width of the weld part 3123 of middle secondary grid line 3122.Thus, according to the solar battery cell of the embodiment of the present application, by being widened at the position that secondary grid line 312 is welding with conductor wire 32, the position that the secondary grid line 3121 in edge welds with conductor wire 32 is wider, the secondary grid line 3121 in conductor wire 32 and edge is welded simpler, weld strength is higher.

Alternatively, according to an embodiment of the application, the width of the weld part 3123 of the secondary grid line 3121 in edge is 0.08-0.6mm.Preferably, the width of the weld part 3123 of the secondary grid line 3121 in edge is 0.15-0.3mm.Thus, the weld part of this size 3123 and conductor wire 32 have larger can bonding area, and weld strength is higher,

In some embodiments of the application, the secondary grid line 312 in edge is the secondary grid line 312 of the side of adjacent cells sheet matrix 311.

Alternatively, according to an embodiment of the application, the secondary grid line 3121 in edge of the every side of adjacent cells sheet matrix 311 is 1-the 5th secondary grid line 312 from outermost.Preferably, the secondary grid line 3121 in edge of the every side of adjacent cells sheet matrix 311 is the 1st to the 4th secondary grid line 312 from outermost.Further, the secondary grid line 3121 in edge of the every side of adjacent cells sheet matrix 311 is the 1st to the 3rd secondary grid line 312 from outermost.Most preferably, the secondary grid line 3121 in edge of the every side of adjacent cells sheet matrix 311 is the 1st to the 2nd secondary grid line 312 from outermost.

Be understandable that, the secondary grid line 3121 in edge can be all secondary grid line 312 of the side of adjacent cells sheet matrix 311, also can be the secondary grid line 312 of part, namely wherein secondary grid line 3121 width in a part of edge increases, and secondary grid line 3121 width in another part edge is equal with centre secondary grid line 3122 width.Wherein be preferably, the secondary grid line 3121 in an edge at the edge of most adjacent cells sheet matrix 311 is widened, and the width of the secondary grid line 3121 in remaining edge to be width of grid line 3122 secondary with centre equal.

As shown in figure 13, in this example, namely the secondary grid line 312 on the right side of adjacent cells sheet matrix 311 forms the secondary grid line 3121 in edge, and the number forming the secondary grid line 312 of the secondary grid line 3121 in edge can carry out determining according to the position of conductor wire 32 coiling.

That is, the position of vicinity one lateral edges of cell piece matrix 311 is provided with the secondary grid line 312 in edge, and its concrete setting position can carry out reasonable adjusting according to the rigging position of cell piece matrix 311.For the secondary grid line 312 in left side, start from left to right, the secondary grid line 3121 in edge that first secondary grid line 312 and second secondary grid line 312 form left side, for the secondary grid line 312 on right side, start from right to left, the secondary grid line 3121 in edge that first secondary grid line 312 and second secondary grid line 312 form right side.

Preferably, in some embodiments of the application, the width of the secondary grid line 3121 in whole edge is greater than the width of middle secondary grid line 3122.Particularly, the width of the secondary grid line 3121 in edge is 0.025-0.3mm, and the width of middle secondary grid line 3122 is 0.015-0.15mm.

In some embodiments of the application, the adhesion between the secondary grid line of wire and edge is in the scope of 0.1-1.5 newton.Preferably, the adhesion between the secondary grid line of wire and edge is in the scope of 0.3-0.8 newton.Thus, firm welding between the secondary grid line of cell piece marginal portion and wire, not easily there is sealing-off in cell piece, not easily occur loose contact, hydraulic performance decline in operation and transfer process, and cost is also lower simultaneously.

That is, in this application, the width of the secondary grid line 3121 in all edges is all wide than the width of the secondary grid line in centre 3122.Thus, the bonding strength of the secondary grid line 3121 in edge and conductor wire 32 can be ensured further, and have larger be connected with conductor wire 32 can welding region.

Solar cell chip arrays 30 according to the embodiment of the present application is described below.

Solar cell chip arrays 30 according to the embodiment of the present application comprises multiple solar battery cell, solar battery cell is the solar battery cell according to above-described embodiment, is connected between the cell piece 31 of adjacent solar battery unit by conductor wire 32.

Owing to there is above-mentioned technique effect according to the solar battery cell of the above embodiments of the present application, therefore, solar cell chip arrays 30 according to the embodiment of the present application also has corresponding technique effect, namely the secondary grid line 3121 in edge is larger with the bonding strength of conductor wire 32, and there is the larger join domain be connected with conductor wire 32, be convenient to the connection between the secondary grid line 3121 of conductor wire 32 and edge.

Particularly, in some embodiments of the application, conductor wire 32 is made up of wire S, reciprocation extension between the surface of the cell piece 31 of wire S in adjacent cell sheet 31 and the surface of another cell piece 31.

Here, cell piece 31 forms cell piece with the conductor wire 32 be made up of the wire S extended on this cell piece 31 surface, in other words, solar cell chip arrays 30 according to the embodiment of the present application is made up of multiple cell piece, and the conductor wire 32 of multiple cell piece is made up of the wire S of reciprocation extension on the surface of cell piece 31.

It is to be appreciated that in this application, term " reciprocation extension " also can be called " coiling ", can refer to that wire S extends along reciprocal stroke between the surface of cell piece 31.

In this application, " between the surface of the cell piece 31 of wire S in adjacent cell sheet 31 and the surface of another cell piece 31 reciprocation extension " should make broad understanding, such as, wire S can between the surface of the cell piece 31 of reciprocation extension in adjacent cell sheet 31 and the surface of another cell piece 31, wire S also can extend through the surface of intermediate cell sheet 31 surface to last cell piece 31 of predetermined quantity from the surface of first cell piece 31, then return from the surface of last cell piece 31 and extend through the surface of surface to the first cell piece 31 of the intermediate cell sheet 31 of described predetermined quantity, repetition like this.

In addition, when cell piece 31 is in parallel by wire S, wire S can reciprocation extension on the front of cell piece, in the case, wire S forms the front side conductive line 32A of cell piece, alternatively, wire S reciprocation extension on the front of cell piece 31 and different wire S reciprocation extensions on the back side of cell piece 31, in the case, the wire S extended on cell piece 31 front forms front side conductive line 32A, and the wire S extending in the back side of cell piece 31 forms back side conductor wire 32B.

When cell piece 31 is one another in series by wire S, between the front of the cell piece 31 of wire S reciprocation extension in adjacent cell sheet 31 and the back side of another cell piece 31, in the case, the part that wire S extends on the front of a cell piece 31 forms front side conductive line 32A, and the part that wire S extends on the back side of another cell piece 31 adjacent forms back side conductor wire 32B.In this application, unless expressly stated otherwise, conductor wire 32 can be understood as front side conductive line 32A, back side conductor wire 32B, or front side conductive line 32A and back side conductor wire 32B.

Here, term " reciprocation extension " can be understood as wire S and extends due to wire 321 back and forth coiling formation U-shaped structure or v-shaped structure between " one back and forth " formation two conductor wires 32, two conductor wires 32, but the application is not limited to this.

According to the cell piece array 30 of the embodiment of the present application, the conductor wire 32 of multiple battery unit is made up of the wire S of reciprocation extension, be connected by conductor wire 32 between adjacent cell sheet 31, therefore, according to conductor wire 32 extracted current that the battery unit of the application adopts wire to make, main gate line extracted current is printed as without the need to using expensive silver slurry, and manufacturing process is simple, cell piece is connected without the need to using welding, the secondary grid line 312 of wire S and cell piece and the easy to connect of back electrode, the cost of cell piece reduces greatly.

In addition, because the wire S of conductor wire 32 by reciprocation extension is formed, the width (i.e. the width of the projection of wire on cell piece) of conductor wire 32 is far smaller than the width of the main gate line that existing printing silver slurry is formed, reduce shading-area, and the quantity of conductor wire 32 can adjust easily, compared with starching with silver the conductor wire that formed, the resistance of conductor wire 32 reduces, and improves photoelectric conversion efficiency.Because wire S reciprocation extension forms conductor wire, when using cell piece array 30 to manufacture solar module 100, wire S more easily accurately controls, not easily be shifted, namely wire is less likely to occur " drift ", can not affect photoelectric conversion efficiency, further increase photoelectric conversion efficiency.

Therefore, according to the solar cell chip arrays 30 of the embodiment of the present application, cost is low, photoelectric conversion efficiency is high.

Below with reference to the accompanying drawings solar cell chip arrays 30 according to the application's specific embodiment is described.

With reference to figure 1-3, the solar cell chip arrays 30 according to the application's specific embodiment is described.

In the embodiment shown in Fig. 1-3, show two battery units of solar cell chip arrays 30, in other words, two cell pieces 31 that the conductor wire 32 shown by being made up of wire S is connected with each other.

Be understandable that, cell piece 31 comprises cell piece matrix 311, the secondary grid line 312 (i.e. the secondary grid line 312A in front) be located on the front of cell piece matrix 311, the back electrode 314 being located at the back of the body electric field 313 on the back side of cell piece matrix 311 and being located on back of the body electric field 313.In this application, it will be appreciated that, unless expressly stated otherwise, back electrode 314 can be the back electrode of conventional batteries sheet, such as, starch printing by silver and formed, and also can be the secondary grid line 312B in the back side of the secondary grid line be similar on cell piece front side of matrix, also can be discrete multiple weld parts, in this application, unless expressly stated otherwise, secondary grid line refers to the secondary grid line 312 on the front of cell piece matrix 311.

When multiple solar battery cell is connected formation solar cell chip arrays 30, in the secondary grid line 312 of adjacent two cell pieces, wire is reciprocation extension on adjacent two cell pieces, and wire adjacent two cell pieces mutual away from side turn back.Because wire is larger in the deformational stress at curved bend folding part place, therefore, secondary grid line herein needs to widen.

Namely when two cell pieces are linked together by the conductor wire of reciprocal coiling, generally need the secondary grid line widening treatment in the edge being positioned at outer ledge of cell piece, namely, with two cell pieces as a whole, the secondary grid line in edge of its outer ledge is widened, namely when two cell pieces are arranged in the lateral direction, the secondary grid line in edge being positioned at the left side of the cell piece on the left side is widened, and the secondary grid line in edge being positioned at the right side of the cell piece on the right is widened.

Particularly, in an embodiment of the application, wire is reciprocation extension between the front of a cell piece 31 and the back side of another cell piece 31.

As Figure 1-3, in this embodiment, solar cell chip arrays comprises two cell piece 31A, 31B (for convenience, referred to herein as the first cell piece 31A, second cell piece 31B), wire S reciprocation extension is at the front (sensitive surface of the first cell piece 31A, upper surface in Fig. 2) and the back side of the second cell piece 31B between, thus, wire S constitutes the front side conductive line 32A of the first cell piece 31A and the back side conductor wire 32B of the second cell piece 31B, wire S is electrically connected with the secondary grid line of the first cell piece 31A and is electrically connected with the back electrode of the second cell piece 31B.

Particularly, in adjacent two cell pieces, first cell piece 31A and the second cell piece 31B comprises cell piece matrix 311 respectively and is located at the secondary grid line 312 in front of cell piece matrix 311, and wire is at the back side reciprocation extension of the front of the first cell piece 31A and the second cell piece 31B.

Wherein, in the secondary grid line 312 of the cell piece matrix 311 of the first cell piece 31A, secondary grid line 312 away from the side of the second cell piece 31B is formed as the secondary grid line 3121 in edge, the width of the secondary grid line 3121 in this edge is greater than the width of all the other secondary grid lines 312, conductor wire 32 is when this position bending, when being connected with the secondary grid line 3121 in the edge of this position, effectively can ensure weld strength.And secondary grid line 3121 live width in the edge of all the other positions and the secondary grid line 3122 in centre are consistent, then can avoid increasing shading-area, ensure photoelectric conversion efficiency.

In an embodiment of the application, the back side of pond sheet matrix 311 is provided with back electrode 314, and wire and back electrode 314 are weldingly connected.

That is, in this embodiment, the front of cell piece matrix 311 is provided with the secondary grid line 312A in front, the back side of this cell piece matrix 311 is provided with back electrode 314, when conductor wire 32 is positioned at the front of cell piece matrix 311, conductor wire 32 is weldingly connected with the secondary grid line 312A in front, when conductor wire 32 is positioned at the back side of cell piece matrix 311, is then weldingly connected with the back electrode 314 at the back side of this cell piece matrix 311.

In certain embodiments, wire S is one, wire S reciprocation extension 10-60 time between the first cell piece 31A and the second cell piece 31B, preferably, as shown in Figure 1, wire reciprocation extension 12 times is to form 24 conductor wires, and wire is single, in other words, single metal wire reciprocation extension forms 24 conductor wires 12 times, and the spacing between adjacent conductive line can be 2.5 millimeters-15 millimeters.According to this embodiment, compared with the main gate line of conventional batteries sheet, quantity increases, thus reduces electric current from secondary grid line to the distance of conductor wire, decreases resistance, improves electricity conversion.In the embodiment shown in fig. 1, adjacent conductive line forms U-shaped structure, is convenient to coiling wiry thus.Alternatively, the application is not limited to this, and such as, adjacent conductive line also can form v-shaped structure.

In certain embodiments, preferably, wire 321 is copper wire, but the application is not limited to this, and such as wire 321 also can be aluminium wire.Preferably, wire 321 has circular cross section, and thus, more sunlight can be irradiated on cell piece matrix, improves photoelectric conversion efficiency further.

More preferably, as shown in Figure 4, weld layer 322 is coated with outside wire 321, wire is welded with secondary grid line and/or back electrode by coated weld layer, thus, be convenient to the electrical connection of wire and secondary grid line and/or back electrode, avoid wire drift in connection procedure and affect photoelectric conversion efficiency.Certainly, the electrical connection of wire and cell piece can be carried out in the lamination process of solar module, also can carry out before being laminated, preferably, connect before being laminated.

In certain embodiments, preferably, before wire contacts with cell piece, wire extends in a tensioned state, stretching by wire, after being connected with the secondary grid line and back electrode of cell piece, tensile force wiry can be discharged, avoid the conductor wire drift when preparing solar module thus further and affect photoelectric conversion efficiency.

Fig. 5 shows the schematic diagram of the cell piece array of another embodiment according to the application.As shown in Figure 5, wire reciprocation extension is between the front of the first cell piece 31A and the front of the second cell piece 31B, thus, wire forms front side conductive line in the front of the first cell piece 31A and the second cell piece 31B, in the case, first cell piece 31A and the second cell piece 31B is connected in parallel to each other, certainly, be understandable that, preferably, the back side conductor wire that the back electrode of the first cell piece 31A and the back electrode of the second cell piece 31B also can be formed by another wire reciprocation extension is connected, alternatively, the back electrode of the first cell piece 31A also can be connected by traditional mode with the back electrode of the second cell piece 31B.

Below with reference to Fig. 6, the solar cell chip arrays 30 according to another embodiment of the application is described.

Comprise n × m cell piece 31 according to the solar cell chip arrays 30 of the embodiment of the present application, in other words, multiple cell pieces 31 are arranged into the matrix form of n × m, and wherein n is columns, and m is row.More specifically, in this embodiment, 36 cell pieces 31 are arranged in 6 row and 6 rows, i.e. n=m=6.Be understandable that, the application is not limited to this, and such as, row and columns can be unequal.For convenience, in figure 6, along direction from left to right, cell piece 31 in same row's cell piece 31 is called the first, second, third, fourth, the 5th and the 6th cell piece 31 successively, along direction from the top down, the row of cell piece 31 is called the first, second, third, fourth, the 5th and the 6th row's cell piece 31 successively.

In same row's cell piece 31, wire reciprocation extension is between the surface of a cell piece 31 and the surface of another adjacent cell piece 31, in adjacent two row's cell pieces 31, between the surface of a cell piece 31 during the surface of the cell piece 31 of wire reciprocation extension in a row and a+1 arrange, and m-1 >=a >=1.

As shown in Figure 6, in concrete example, in same row's cell piece 31, wire reciprocation extension is between the front of a cell piece 31 and the back side of another adjacent cell piece 31, and thus, the cell piece 31 in same row is one another in series.In adjacent two row's cell pieces 31, wire reciprocation extension is in the front of the cell piece 31 of an end of arranging at a and between the back side of a cell piece 31 of the end that a+1 arranges, and adjacent two row's cell pieces 31 are one another in series thus.

Wherein, in the multiple secondary grid line 312 of multiple cell piece, have conductor wire 32 through and the secondary grid line 312 of side that conductor wire 32 is turned back is formed as edge pair grid line 3121, the secondary grid line 3121 in these edges is positioned at the position of wire bending, the secondary grid line 3121 in edge of this part carries out widening treatment, the width being positioned at the secondary grid line 3121 in edge of opposite side then can keep the width of grid line 3122 secondary with centre consistent, while the effect playing the bonding strength effectively strengthening conductor wire 32 and secondary grid line 312, can avoid increasing shading-area, ensure photoelectric conversion efficiency.

More preferably, in adjacent two row's cell pieces 31, wire reciprocation extension is on the surface of the cell piece 31 of an end of arranging at a and between the surface of the cell piece 31 of the end that a+1 arranges, the end that an end of a row and a+1 arrange is positioned at the same side of matrix, such as in figure 6, the right side of matrix is positioned at.

More specifically, in the embodiment shown in fig. 6, in the first row, between the back side between the front of one one metal wire reciprocation extension first cell piece 31 and the second cell piece 31, between the back side between the front of the second one metal wire reciprocation extension second cell piece 31 and the 3rd cell piece 31, between the back side between the front of the 3rd one metal wire reciprocation extension the 3rd cell piece 31 and the 4th cell piece 31, between the back side between the front of the 4th one metal wire reciprocation extension the 4th cell piece 31 and the 5th cell piece 31, between the back side between the front of the 5th one metal wire reciprocation extension the 5th cell piece 31 and the 6th cell piece 31, thus, adjacent cell sheet 31 in first row is one another in series by corresponding wire.

Between the back side between the 6th cell piece 31 in the front of the 6th cell piece 31 in six roots of sensation wire reciprocation extension first row and adjacent second row, thus, first row and second row are one another in series, between the back side in the front of the 6th cell piece 31 in the 7th one metal wire reciprocation extension second row and second row between the 5th cell piece 31, between the back side in the front of the 5th cell piece 31 in the 8th one metal wire reciprocation extension second row and second row between the 4th cell piece 31, by that analogy, until between the back side in the front of the second cell piece 31 in the 11 one metal wire reciprocation extension second row and second row between the first cell piece 31, then, the front and the 3rd of the first cell piece 31 in the 12 one metal wire reciprocation extension second row arrange between the back side between the first cell piece 31, second row and the 3rd is arranged and is one another in series thus.Then, successively the 3rd row and the 4th is arranged and connect, 4th row and the 5th arranges and connects, 5th row and the 6th arranges and connects, complete the preparation of cell piece array 30 thus, in this embodiment, busbar is set in the left side of the left side of the first cell piece 31 of first row and the 6th the first cell piece 31 arranged, a busbar connects the conductor wire extended from the left side of the first cell piece 31 of first row, and another busbar connects the conductor wire extended from the left side of first cell piece 31 of the 6th row.

As shown in the figure and above-mentioned, connection between the cell piece of the embodiment of the present application adopts conductor wire series connection, conductor wire is all adopted to realize series connection between first row, second row, the 3rd row, the 4th row, the 5th row and the 6th row, as shown in the figure, alternatively, also can be in parallel for preventing the diode of spottiness between second row and the 3rd row, between the 4th row and the 5th row, the connection of diode can adopt the technology of well known to a person skilled in the art, such as busbar.

But, the application is not limited to this, such as, can connect between first row and second row, the 3rd row and the 4th row's series connection, the 5th row and the 6th row's series connection, second row and the 3rd row's parallel connection simultaneously, 4th row and the 5th row's parallel connection, in the case, can arrange in the left side of respective row or right side and arrange busbar respectively.

Alternatively, the cell piece 31 in same row can be in parallel, and such as, an one metal wire passes through the front of the second to the 6th cell piece 31 from the front reciprocation extension of the first cell piece 31 first row.

Preferably, the wire of reciprocation extension between the adjacent cell sheet 31 of same row is one, and the wire of reciprocation extension between the cell piece 31 of adjacent row is one.Thus, can realize the connection between adjacent two cell pieces 31 by the repeatedly reciprocation extension of an one metal wire, preparation is simpler, and cost is lower.

In the application's embodiment, wire is coated with weld layer, the thickness of weld layer and diameter ratio wiry are 0.02-0.5:1.

That is, in cell piece array 30, the thickness of weld layer and the diameter ratio of conductor wire 32 (comprising front side conductive line 32A and back side conductor wire 32B) can be 0.02-0.5:1.

In this application, conductor wire 32 (comprising front side conductive line 32A and back side conductor wire 32B) comprises wire and is coated on the weld layer in this wire surface.Weld layer can clad metal silk completely, also can part clad metal silk.When weld layer part clad metal silk, weld layer is preferably formed in the position of welding with the secondary grid line 312 of cell piece 31.When the complete clad metal silk of weld layer, weld layer can be coated on periphery wiry with the form of ring-type.The thickness of weld layer can be selected in the larger context.Under preferable case, the thickness of weld layer is 1-100 micron, is more preferably 1-30 micron.

The low-melting alloy forming weld layer can be the low-melting alloy of this area routine, and its fusing point can be 100-220 DEG C.Under preferable case, low-melting alloy contains Sn and is selected from least one in Bi, In, Ag, Sb, Pb and Zn, at least one more preferably containing Sn, Bi and be selected from In, Ag, Sb, Pb and Zn.

Particularly, low-melting alloy can be at least one in Sn-Bi alloy, In-Sn alloy, Sn-Pb alloy, Sn-Bi-Pb alloy, Sn-Bi-Ag alloy, In-Sn-Cu alloy, Sn-Bi-Cu alloy and Sn-Bi-Zn alloy.Most preferably, low-melting alloy is Bi-Sn-Pb alloy, such as Sn content is 40 % by weight, Bi content be 55 % by weight and Pb content be 5 % by weight namely alloy (also Sn40%-Bi55%-Pb5%).The thickness of weld layer can be 0.001-0.06mm.The cross-sectional area of conductor wire 32 can be 0.01-0.5mm ².The wire that wire can be commonly used for this area, as copper wire.

In some embodiments of the application, the adhesion between wire and cell piece 31 is in the scope of 0.1-0.8 newton.That is, the adhesion between conductor wire 32 and cell piece 31 is between 0.1-0.8 newton.Preferably, the adhesion between wire and cell piece 31 in the scope of 0.2-0.6 newton, firm welding between cell piece and wire, not easily sealing-off is there is in cell piece in operation and transfer process, not easily occur loose contact, hydraulic performance decline, cost is also lower simultaneously.

Below with reference to Figure 10 and Figure 11, the solar module 100 according to the embodiment of the present application is described.

As shown in Figure 10 and Figure 11, upper cover plate 10, front adhesive film 20, above-mentioned cell piece array 30, back side adhesive film 40 and backboard 50 is comprised according to the solar module 100 of the embodiment of the present application.Upper cover plate 10, front adhesive film 20, above-mentioned cell piece array 30, back side adhesive film 40 and backboard 50 are stacked successively along the vertical direction.

Front adhesive film 20 and back side adhesive film 40 can be the adhesive film that this area routine uses, preferably, front adhesive film 20 and back side adhesive film 40 polyethylene octene elastomer (POE) and/or ethylene-vinyl acetate copolymer (EVA).In this application, polyethylene octene elastomer (POE) and ethylene-vinyl acetate copolymer (EVA) can adopt the product of this area routine use or prepare according to method well known to those skilled in the art.

In the embodiment of the application, upper cover plate 10 and backboard 50 can carry out selecting and determining according to the technology of this area routine, and preferably, upper cover plate 10 and backboard 50 can be transparent sheet material, such as glass plate separately.

In the preparation process of solar module 100, first the secondary grid line of conductor wire and cell piece 31 and back electrode can be welded, then each layer be carried out stacked and lamination.

Can be known in the art according to other component parts of the solar module 100 of the application, not repeat them here.

Concrete, solar module 100 comprises upper cover plate 10, front adhesive film 20, cell piece array 30, back side adhesive film 40 and backboard 50.Cell piece array 30 comprises multiple cell piece 31, be connected by many conductor wires 32 between adjacent cell sheet 31, conductor wire 32 is formed by the wire S of reciprocation extension between the surface of adjacent cell sheet, conductor wire 32 welds with secondary grid line, and front adhesive film 20 directly contacts with conductor wire 32 and is filled between adjacent conductor wire 32.

In other words, stacked upper cover plate 10, front adhesive film 20, cell piece array 30, back side adhesive film 40 and backboard 50 is successively comprised along the vertical direction according to the solar module 100 of the embodiment of the present application, cell piece array 30 comprises multiple cell piece 31 and the many conductor wires 32 being connected multiple cell piece 31, conductor wire 32 is made up of wire S, and wire S reciprocation extension is on the surface of adjacent two cell pieces 31.

Conductor wire 32 is electrically connected with cell piece 31, wherein, front adhesive film 20 on cell piece 31 directly contacts with conductor wire 32 and is filled between adjacent conductor wire 32, front adhesive film 20 both can play the effect of fixing conductor wire 32, conductor wire 32 can be completely cut off with outside air and steam again, thus avoid conductor wire 32 oxidized, ensure that photoelectric conversion efficiency.

Thus, according to the solar module 100 of the embodiment of the present application, replaced main gate line and the welding of conventional batteries sheet by the conductor wire 32 be made up of the wire S of reciprocation extension, reduce cost; The wire S of reciprocation extension decreases the number of the free end of wire S, and when arranging wire S, requisite space is little, and not by spatial limitation, the radical of the conductor wire 32 be made up of wire S reciprocation extension can significantly improve, and preparation is simple, can produce in batches; Front adhesive film 20 directly contacts with conductor wire 32 and is filled between adjacent conductor wire 32, effectively by isolated to conductor wire 32 and outside air, steam etc., can avoid the oxidation of conductor wire 32, effectively can ensure electricity conversion.

In some embodiments of the application, reciprocation extension between the front of the cell piece 31 of wire S in adjacent cell sheet 31 and the back side of another cell piece 31, front adhesive film 20 directly contacts with the conductor wire 32 on the front of a cell piece 31 and is filled between the adjacent conductive line 32 on the front of a cell piece 31, and back side adhesive film 40 directly contacts with the conductor wire 32 at the back side of another cell piece 31 and is filled between the adjacent conductive line 32 at the back side of another cell piece 31.

That is, in this application, adjacent two cell pieces 31 are connected by wire S-phase, and in adjacent two cell pieces 31, the front of a cell piece 31 and wire S-phase connect, and the back side of another cell piece 31 and wire S-phase connect.

Wherein, front adhesive film 20 on the cell piece 31 that front and wire S-phase connect directly contacts with the wire S in this cell piece 31 front and is filled between adjacent conductor wire 32, and the back side adhesive film 40 of the cell piece 31 that the back side connects with wire S-phase directly contacts with the wire S at this cell piece 31 back side and is filled between adjacent conductor wire 32 (as shown in Figure 2).

Thus, according to the solar module 100 of the embodiment of the present application, not only the conductor wire 32 in the front of a part of cell piece 31 can separate with the external world by front adhesive film 20, the conductor wire 32 at the back side of percentage of batteries sheet 31 also can separate with the external world by back side adhesive film 40, can ensure the photoelectric conversion efficiency of solar module 100 further.

In some embodiments of the application, the size for the cell piece of routine is 156mm × 156mm; The series resistance of solar module is 380-440 milliohm/60 slice, and simultaneously the application is not limited to 60, can be 30,72 etc., when being 456-528 milliohm for the series resistance of solar module when 72, and the excellent electrical property of battery.

In some embodiments of the application, the size for the cell piece of routine is 156mm × 156mm; The open circuit voltage of solar module is 37.5-38.5V/60 sheet, and same the application is not limited to 60, can be 30,72 etc.Short circuit current is 8.9-9.4A, and the number of short circuit current and cell piece has nothing to do.

In some embodiments of the application, the fill factor, curve factor of solar module is 0.79-0.82, and it is not by the size of cell piece and the impact of number, and it affects the electrical property of battery.

In some embodiments of the application, the size for the cell piece of routine is 156mm × 156mm; The operating voltage of solar module is 31.5-32V/60 sheet, and same the application is not limited to 60, can be 30,72 etc.Operating current is 8.4-8.6A, and the number of operating current and cell piece has nothing to do.

In some embodiments of the application, the size for the cell piece of routine is 156mm × 156mm; The conversion efficiency of solar module is 16.5-17.4%.Power is 265-280W/60 sheet.

Below with reference to Fig. 7-9, the preparation method according to the solar module 100 of the embodiment of the present application is described.Cell piece 31 is provided, the multiple secondary grid line 312 that cell piece 31 comprises cell piece matrix 311 and is located on the front of cell piece matrix 311, the secondary grid line 312 in edge that secondary grid line 312 comprises adjacent cells sheet matrix 311 edge and the secondary grid line 312 in centre be positioned at inside the secondary grid line 312 in edge, the width of the secondary grid line 312 at least one edge is greater than the width of middle secondary grid line 312.As well known to those skilled in the art, secondary grid line generally can be formed by printing silver slurry, and the arrangement of secondary grid line and shape can be obtained by the setting of printing screen plate, namely, the secondary grid line how obtaining different in width is known to the skilled person, and is not described in detail at this.

The conductor wire 32 be made up of wire is connected to obtain solar battery cell with secondary grid line 312.

By stacked successively to upper cover plate 10, front adhesive film 20, cell piece array 30, back side adhesive film 40 and backboard 50, and make the front of cell piece 31 in the face of the back side of front adhesive film 20, cell piece 31 in the face of back side adhesive film 40, then carry out lamination and obtain solar module 100.

Particularly, in the multiple secondary grid line 312 of multiple cell piece, have conductor wire 32 through and the secondary grid line 312 of side that conductor wire 32 is turned back is formed as edge pair grid line 3121, the secondary grid line 3121 in these edges is positioned at the position of wire bending, the secondary grid line 3121 in edge of this part carries out widening treatment, the width being positioned at the secondary grid line 3121 in edge of opposite side then can keep the width of grid line 3122 secondary with centre consistent, while the effect playing the bonding strength effectively strengthening conductor wire 32 and secondary grid line 312, can avoid increasing shading-area, ensure photoelectric conversion efficiency.

Comprise according to the preparation method of the solar module 100 of the embodiment of the present application and first prepare above-mentioned cell piece array 30, then stacked upper cover plate 10, front adhesive film 20, cell piece array 30, back side adhesive film 40 and backboard 50 successively, finally carries out lamination and obtains solar module 100.Be understandable that, the preparation of solar module 100 also comprises other steps, such as, use the space between sealant sealing upper cover plate 10 and backboard 50, and utilizes U-shaped frame to be tightened together by said elements, this it is known to those skilled in the art that, is not described in detail here.

The preparation of solar cell chip arrays 30 comprises and is connected with the surface electrical of described cell piece 31 and forms many conductor wires between the surface of cell piece 31 by wire reciprocation extension, and cell piece 31 adjacent thus connected by described many conductor wires and form cell piece array 30.

Particularly, as shown in Figure 7, in a tensioned state, by wire reciprocation extension 12 times.Then, as shown in Figure 8, the first cell piece 31 and the second cell piece is prepared.Next, as shown in Figure 9, the front of the first cell piece 31 is connected with wire and the back side of the second cell piece 31 is connected with wire, form cell piece array 30 thus, two cell pieces 31 have been shown in Fig. 9, as mentioned above, when cell piece array 30 has multiple cell piece 31, utilize the wire of reciprocation extension to be connected at the back side of the front of a cell piece 31 with another adjacent cell piece 31, be connected with the back electrode wire of another cell piece 31 by the secondary grid line of a cell piece 31.Wire is by reciprocation extension under two clip tensionings laying respectively at these rhizoid two ends, and this wire only needs two clips to realize coiling, greatly reduces the consumption of clip, saves assembly space.

In the embodiment shown in fig. 9, adjacent cell sheet is one another in series, and as mentioned above, as required, adjacent cell sheet can be connected in parallel to each other by wire.

By stacked successively with upper cover plate 10, front adhesive film 20, back side adhesive film 40 and backboard 50 for the cell piece array 30 prepared, and make the front of described cell piece 31 in the face of the back side of described front adhesive film 20, described cell piece 31 in the face of back side adhesive film 40, then carry out lamination and obtain solar module 100.Be understandable that, wire welds with cell piece 31, and the connection of wire and cell piece 31 can be carried out in lamination process, certainly, also can first connect, rear lamination.

Front adhesive film 20 directly contacts placement with conductor wire 32, the gap when lamination between front adhesive film 20 melting filled conductive line 32.Back side adhesive film 40 directly contacts placement with conductor wire 32, the gap when lamination between back side adhesive film 40 melting filled conductive line 32.

Example 1

Example 1 is for illustration of the example of the solar module 100 and preparation method thereof of the application.

(1) wire S is prepared

The surface of copper wire is adhered to one deck Sn40%-Bi55%-Pb5% alloy-layer (fusing point is 125 DEG C), and wherein, the cross-sectional area of copper wire is 0.04mm ², the thickness of alloy-layer is 16 microns, thus obtained wire S.

(2) solar module 100 is prepared

The POE adhesive film being of a size of 1630 × 980 × 0.5mm (melt temperature is 65 DEG C) is provided, and correspondingly provides the glass plate that is of a size of 1633 × 985 × 3mm and 60 chip sizes to be the polycrystalline silicon battery plate 31 of 156 × 156 × 0.21mm.Cell piece 31 has 91 secondary grid lines, the secondary grid line of every bar runs through cell piece 31 substantially in the vertical, and the distance between adjacent pair grid line is 1.7mm, the back side of cell piece 31 has 5 back electrodes, and (material is tin, width is 1.5 millimeters, thickness is 10 microns), every bar back electrode runs through cell piece 31 substantially in the vertical, and the distance between adjacent two back electrodes is 31mm.

Wherein, secondary grid line 312 material is silver, and in multiple secondary grid line 312, the width of the secondary grid line 3121 in 5 edges of a contiguous lateral edges is 0.15mm, and the width of all the other secondary grid lines 312 is 0.04, and thickness is 9 microns.

60 cell pieces 31 are arranged with a matrix type (6 row 10 row), between two cell pieces 31 adjacent in same row, make one metal wire state reciprocation extension in tension between the front and the back side of another cell piece of a cell piece 31, wherein, on adjacent two cell pieces 31, the secondary grid line 3121 in the edge widened of width be positioned at have the position of wire process with welded wire.

Wire is by reciprocation extension under two clip tensionings laying respectively at these rhizoid two ends, thus the conductor wire that formation 15 is parallel, and the secondary grid line of a cell piece 31 is welded with conductor wire, the back electrode of another cell piece 31 is welded with conductor wire, welding temperature is 160 DEG C, and the distance between the adjacent conductive line be parallel to each other is 9.9mm.Thus by a row for 10 cell piece series connection, 6 rows this kind of battery strings is connected into array by busbar.

Then, by upper glass plates, upper POE adhesive film, in the matrix form arrangement and stack successively from top to bottom with multiple cell pieces of welded wire, lower POE adhesive film and lower glass plate, wherein, make the sensitive surface of cell piece 31 in the face of front adhesive film 20, front adhesive film 20 directly contacts with conductor wire 32, make the back side of cell piece 31 in the face of back side adhesive film 40, then put into laminating machine and carry out lamination, front adhesive film 20 is filled between adjacent conductor wire 32, thus obtained solar module 100A1.

Comparative examples 1

Comparative examples 1 is with the difference of example 1:

The width of secondary grid lines 312 all on cell piece 31 is identical, is 0.04.Wire between the front and the back side of another cell piece of a cell piece 31 tension state reciprocation extension and weld with secondary grid line 312.Thus obtained solar module D1.

Example 2

Example 2 is for illustration of the example of the solar module and preparation method thereof of the application.

(1) wire S is prepared

The surface of copper wire is adhered to one deck Sn40%-Bi55%-Pb5% alloy-layer (fusing point is about 125 DEG C), and wherein, the cross-sectional area of copper wire is 0.03mm ², the thickness of alloy-layer is 10 microns, thus obtained wire S.

(2) solar module is prepared

The EVA adhesive film layer being of a size of 1630 × 980 × 0.5mm (melt temperature is 60 DEG C) is provided, provides the glass plate that is of a size of 1633 × 985 × 3mm and 60 chip sizes to be the polycrystalline silicon battery plate 31 of 156 × 156 × 0.21mm.The sensitive surface of cell piece 31 is provided with 91 secondary grid lines, the secondary grid line of every bar runs through cell piece 31 substantially in the vertical, and the distance between adjacent two secondary grid lines is 1.7mm, the back side of cell piece 31 is provided with 5 back electrodes, and (material is tin, width is 1.5 millimeters, thickness is 10 microns), and every bar back electrode runs through cell piece 31 substantially in the vertical, and the distance between adjacent two back electrodes is 31mm.

Wherein, secondary grid line 312 material is silver, and in multiple secondary grid line 312, the width of the secondary grid line 3121 in 3 edges of a contiguous lateral edges is 0.2mm, and the width of all the other secondary grid lines 312 is 0.03, and thickness is 9 microns.

60 cell pieces 31 are arranged with a matrix type (6 row 10 row), between two cell pieces 31 adjacent in same row, make wire state reciprocation extension in tension between the front and the back side of another cell piece of a cell piece 31, thus the conductor wire that formation 20 is parallel, and the secondary grid line of a cell piece 31 is welded with conductor wire, welded with conductor wire by the back electrode of another cell piece 31, welding temperature is 160 DEG C and distance between the adjacent conductive line be parallel to each other is 7mm.Thus by a row for 10 cell piece series connection, 6 rows this kind of battery strings is connected into array by busbar.

Then, by upper glass plates, upper POE adhesive film, in the matrix form arrangement and stack successively wherein from top to bottom with multiple cell pieces of welded wire, lower POE adhesive film and lower glass plate, make the sensitive surface of cell piece 31 in the face of front adhesive film 20, front adhesive film 20 directly contacts with conductor wire 32, make the back side of cell piece 31 in the face of back side adhesive film 40, then put into laminating machine and carry out lamination, front adhesive film 20 is filled between adjacent conductor wire 32, thus obtained solar module A2.

Example 3

Method according to example 2 prepares solar module, be with the difference of example 2: secondary grid line 312 material is silver, in multiple secondary grid line 312, the width of the secondary grid line 3121 in 4 edges of a contiguous lateral edges is 0.1mm, the width of all the other secondary grid lines 312 is 0.05mm, and thickness is 9 microns.

Thus obtained solar module A3.

Performance test:

(1) the secondary grid line at cell piece edge and conductor wire is observed whether to have rosin joint phenomenon by naked-eye observation method.

(2) the solder bond Force meansurement between the secondary grid line in edge and wire:

Test the solder bond power between wire and the secondary grid line of cell piece in solar module A1-A5 and D1 by the following method:

1, cell piece level is placed on the test position of tension tester, places briquetting by cell piece, briquetting is placed in both sides wiry, and when making to test, cell piece is not pulled up;

2, wire is clipped on the draw ring of tensiometer, direction of pull and cell piece angle at 45 °;

3, tensiometer is started, make tensiometer vertically upwards uniform motion, by wire from cell piece surface pull-up, the pulling force data that records of tensiometer when record wire departs from, gets its average and is solder bond force data between this wiry and secondary grid line of cell piece.

(3) photoelectric conversion efficiency test:

Disclosed in IEC904-1, method adopts single flash operation simulator to test solar module prepared by above-mentioned example and comparative examples, and test condition is standard test condition (STC): light intensity is 1000W/m ²; Spectrum is AM1.5; Temperature is 25 DEG C, records the photoelectric conversion efficiency of each cell piece.

Result is as shown in table 1 below.

Table 1

Solar module	A1	D1	A2	A3
					Whether there is rosin joint	Nothing	Have	Nothing	Nothing
Solder bond power/N	0.34	0.1	0.46	0.22
					Photoelectric conversion efficiency (%)	16.6	15.4	17.1	17.0

As can be seen from the result of table 1, the solar module of the embodiment of the present application, at the edge of cell piece, between conductor wire and secondary grid line, solder bond power is good, weld strength is high, there will not be sealing-off or rosin joint, and can obtain relatively high photoelectric conversion efficiency.

In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.

In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In description of the present utility model, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.

In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.

In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score can comprise the first and second features and directly contact, also can comprise the first and second features and not be directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is less than second feature.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.

Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment when not departing from principle of the present utility model and aim, revising, replacing and modification in scope of the present utility model.

Claims

1. a solar battery cell, is characterized in that, comprising:

Cell piece, described cell piece comprises cell piece matrix and is located at the multiple secondary grid line on the front of described cell piece matrix, the secondary grid line in edge that described secondary grid line comprises contiguous described cell piece matrix border and the secondary grid line in centre be positioned at inside the secondary grid line in described edge, the width of the secondary grid line at least one edge described is greater than the width of the secondary grid line in described centre;

Multiple conductor wire, described multiple conductor wire is spaced apart from each other setting, and described conductor wire is crossing with described secondary grid line and be connected with described secondary grid line.

2. solar battery cell according to claim 1, it is characterized in that, described secondary grid line is provided with the weld part for welding with described conductor wire, and the width of weld part on the direction being orthogonal to the secondary grid line in edge of the secondary grid line in described edge is greater than the width of the weld part of the secondary grid line in described centre.

3. solar battery cell according to claim 2, is characterized in that, the width of the weld part of the secondary grid line in described edge is 0.08-0.6mm.

4. solar battery cell according to claim 3, is characterized in that, the width of the weld part of the secondary grid line in described edge is 0.15-0.3mm.

5. the solar battery cell according to any one of claim 1-4, is characterized in that, the secondary grid line in described edge is the secondary grid line of the side of contiguous described cell piece matrix.

6. the solar battery cell according to any one of claim 1-4, is characterized in that, the secondary grid line in edge of the contiguous described every side of cell piece matrix is 1-the 5th secondary grid line from outermost.

7. solar battery cell according to claim 6, is characterized in that, the secondary grid line in edge of the contiguous described every side of cell piece matrix is the 1st to the 4th secondary grid line from outermost.

8. solar battery cell according to claim 7, is characterized in that, the secondary grid line in edge of the contiguous described every side of cell piece matrix is the 1st to the 3rd secondary grid line from outermost.

9. solar battery cell according to claim 8, is characterized in that, the secondary grid line in edge of the contiguous described every side of cell piece matrix is the 1st to the 2nd secondary grid line from outermost.

10. solar battery cell according to claim 1, is characterized in that, the width of the secondary grid line in whole described edge is greater than the width of the secondary grid line in described centre.

11. solar battery cells according to claim 1, is characterized in that, the width of the secondary grid line in described edge is 0.25-0.3mm, and the width of the secondary grid line in described centre is 0.015-0.15mm.

12. solar battery cells according to claim 1, is characterized in that, described conductor wire is made up of wire, and the adhesion between the secondary grid line of described wire and described edge is in the scope of 0.1-1.5 newton.

13. solar battery cells according to claim 12, is characterized in that, the adhesion between the secondary grid line of described wire and described edge is in the scope of 0.3-0.8 newton.

14. 1 kinds of solar cell chip arrays, is characterized in that, comprise multiple battery unit, and described battery unit is the solar battery cell according to any one of claim 1-13, are connected between the cell piece of adjacent cell by described conductor wire.

15. solar cell chip arrays according to claim 14, it is characterized in that, described conductor wire is made up of wire, reciprocation extension between the surface of the cell piece of described wire in the cell piece of adjacent cell sheet and the surface of another cell piece.

16. solar cell chip arrays according to claim 15, is characterized in that, described wire is reciprocation extension between the front and the back side of another cell piece described of a described cell piece.

17. solar cell chip arrays according to claim 16, is characterized in that, the back side of described cell piece matrix is provided with back electrode, and described wire is connected with the back electrode of another cell piece described.

18. solar cell chip arrays according to any one of claim 15-17, is characterized in that, described wire reciprocation extension 10-60 time between the front and the back side of another cell piece described of a described cell piece.

19. solar cell chip arrays according to any one of claim 15-17, it is characterized in that, the spacing between adjacent conductive line is 2.5-15mm.

20. solar cell chip arrays according to any one of claim 15-17, is characterized in that, adjacent conductive line forms U-shaped or v-shaped structure.

21. solar cell chip arrays according to claim 15, it is characterized in that, described cell piece is arranged into the matrix form of n × m, and wherein n is columns, and m is row,

In same row's cell piece, described wire reciprocation extension is between the surface of a cell piece and the surface of another adjacent cell piece, in adjacent two row's cell pieces, between the surface of a cell piece during the surface of the cell piece of described wire reciprocation extension in a row and a+1 arrange, and m-1 >=a >=1.

22. solar cell chip arrays according to claim 21, it is characterized in that, in adjacent two row's cell pieces, described wire reciprocation extension is on the surface of the cell piece of an end of arranging at a and between the surface of the cell piece of the end that a+1 arranges, and the end that an end of described a row and described a+1 arrange is positioned at the same side of described matrix.

23. solar cell chip arrays according to claim 22, is characterized in that, in same row's cell piece, described wire reciprocation extension between the front of a cell piece and the back side of another adjacent cell piece,

Adjacent two row cell pieces in, described wire reciprocation extension in the front of the cell piece of an end of arrange at a and between the back side of a cell piece of the end that a+1 arranges, with connect adjacent two arrange cell pieces.

24. solar cell chip arrays according to any one of claim 21-23, it is characterized in that, the wire of reciprocation extension between the adjacent cell sheet of same row is one, and the wire of reciprocation extension between the cell piece of adjacent row is one.

25. solar cell chip arrays according to claim 15, is characterized in that, described wire is one.

26. solar cell chip arrays according to claim 15, is characterized in that, described wire is coated with weld layer, and described conductor wire is welded with described secondary grid line by described weld layer.

27. solar cell chip arrays according to claim 26, is characterized in that, thickness and the described diameter ratio wiry of described weld layer are 0.02-0.5:1.

28. solar cell chip arrays according to claim 26, is characterized in that, the thickness of described weld layer is 1-100 micron.

29. 1 kinds of solar modules, is characterized in that, comprise upper cover plate stacked successively, front adhesive film, cell piece array, back side adhesive film and backboard, the solar cell chip arrays of described cell piece array according to any one of claim 14-28.