Background technique
In recent years, PERC (Passivated Emitter and Rear Cell, i.e. passivation emitter rear-face contact) electricity
Pond has become the mainstream technology of entire area of solar cell.Wherein, two-sided PERC battery is even more and payes attention to by industry, two-sided
PERC battery changes the Al-BSF structure at the cell piece back side on the basis of conventional single side PERC battery, and traditional full aluminium is carried on the back
Field structure is changed to alum gate cable architecture (i.e. a kind of specific conductive gate form), so that the place that the cell piece back side is not covered by aluminium paste
Also it can receive illumination to realize that the back side generates electricity, so as to effectively increase the generated energy of single battery piece.
In two-sided PERC cell fabrication processes, need to form specific grooved pattern knot at the cell piece back side using laser
Structure, and alum gate line is completely covered in laser groove by accurate printing, to realize that alum gate line is formed in regional area and silicon
Electronics is pooled to rear electrode eventually by alum gate line with the electronics export for generating inside battery by Ohmic contact.It is using
Laser is set when the cell piece back side is slotted refering to what is shown in Fig. 1, being formed by grooved pattern structure and generally including one group of parallel interval
It sets and is made of slotted line 10 laser groove, so in practical grooving process, due to the cumulative errors and cell piece 100 of equipment operation
The factors such as warped, laser slotting patterning outermost and the slotted line 10 close to outside often go out at 100 back side of cell piece
Existing biggish position deviation, the usual form of expression of position deviation is as shown in Fig. 2, Fig. 3 (only showing outermost slotted line 10
Position deviation form), there is biggish inclination in the slotting position relative theory position of outermost slotted line 10, so that this is most
The laser groove location relative theory position at 10 both ends of outside slotted line will appear biggish position deviation.Since alum gate line is to laser
The covering of slot is other implementation above precise alignment in the micron-scale, thus in the alum gate line printing process of subsequent two-sided PERC battery
It occur the problem that
Outermost and the laser groove of 10 end of slotted line close to outside exceed the coverage area of alum gate line, i.e., two-sided PERC
Exact matching can not be formed between the laser groove and alum gate line at battery back, and the region that laser groove is not covered by alum gate line is by nothing
It is electrically connected between method and alum gate line, so will affect the incident photon-to-electron conversion efficiency of final cell piece.
In view of this, it is necessary to provide a kind of technical solutions how to improve between cell piece backside laser slot and alum gate line
Matching value.
Utility model content
The utility model aims to solve at least one of technical problem of the existing technology, to realize above-mentioned utility model mesh
, the utility model provides a kind of laser slotting patterning, and specific design method is as follows.
A kind of laser slotting patterning, including the major trough line that several intervals are arranged and are made of laser groove, the laser
Grooved pattern structure further includes several auxiliary line of rabbet joint being made of laser groove, and each auxiliary line of rabbet joint all has from a major trough line
The direction of one end towards major trough line the other end position described in this extends and is located at two of the major trough line two sides
Point, the laser slotting patterning is provided with the auxiliary line of rabbet joint to being less than at the end positions of major trough line described in outermost two.
Further, the direction of the major trough line described in each outermost laser slotting patterning interior direction, the 1st to n
The auxiliary line of rabbet joint is provided at the end positions of major trough line described in root, wherein 2≤n≤5.
Further, each auxiliary line of rabbet joint is located at two parts of major trough line two sides using major trough line described in this as symmetry axis
It is symmetrical.
Further, it is 2-3cm, each auxiliary slot that each auxiliary line of rabbet joint, which is projected on the length range on the major trough line,
It is 100-200 μm that line, which is located at the maximum distance range between two parts of major trough line two sides and the corresponding major trough line,.
Further, each auxiliary line of rabbet joint is located at two parts of corresponding major trough line two sides each parallel to major trough described in this
Line, each auxiliary line of rabbet joint also have linkage section, and the both ends of the linkage section are respectively connected to the auxiliary line of rabbet joint and are located at the master
Line of rabbet joint two sides two parts are in the end on extending direction.
Further, the auxiliary line of rabbet joint be located at major trough line two sides two parts on extending direction end and the connection
Section at right angles connects or is in circular sliding slopes.
Further, each auxiliary line of rabbet joint be located at two parts of corresponding major trough line two sides on its extending direction by
Gradually draw close the major trough line.
Further, each major trough line and each auxiliary line of rabbet joint include several laser grooves being spaced apart.
Further, on the length direction of Yu Suoshu major trough line, the forming position of laser groove on every adjacent two major trough line
Relative misalignment.
Further, the length range for constituting the laser groove of the major trough line is 700-1100 μm, width range is 25-50 μ
M, the interval of adjacent two laser groove is 100-700 μm in same major trough line, between the adjacent two major trough line away from
It is 700-900 μm from range.
The utility model additionally provides a kind of cell piece, including substrate, the substrate to be less than a surface formed just like with
The upper laser slotting patterning, the cell piece also has several intervals settings and extending direction prolongs with the major trough line
The consistent conductive gate in direction is stretched, the conductive gate covers the laser groove of the laser slotting patterning and by the laser groove
It is electrically connected between the substrate.
The utility model additionally provides a kind of solar components, which has above-described solar battery
Piece.
The beneficial effects of the utility model are: the specific design based on the utility model laser slotting patterning, double
In the application scenarios of face PERC battery, when printing alum gate line covering laser groove, if laser slotting patterning is close to outside
The slotting position relative theory position of major trough line tilts, then not covering to the alum gate line of major trough thread end can cover to auxiliary
On the line of rabbet joint, so ensures that alum gate line passes through between laser groove and the silicon layer of cell piece with enough contacts area, accordingly may be used
It improves the fill factor of cell piece and reduces the series resistance of cell piece, to realize the production of high-quality finished battery.
Specific embodiment
The utility model is described in detail below with reference to each implementation structure shown in the drawings, referring to figure 4. to Fig. 8
It is shown, it is some better embodiments of the utility model.
The utility model for ease of understanding is described in detail by taking two-sided PERC battery as an example below, i.e. Fig. 4 to Fig. 8 institute
Show that cell piece 200 involved in embodiment is two-sided PERC battery, wherein laser slotting patterning is formed in cell piece back
Face.Of course, it should be understood that related cell piece 200 is also possible to other in the other embodiments of the utility model
Type needs overleaf to use the battery of laser slotting, can be also used for needing to use the battery of laser slotting in battery front side.
Refering to what is shown in Fig. 4, laser slotting patterning involved in the utility model includes several spaced masters
The line of rabbet joint 20, as shown in connection with fig. 8, major trough line 20 are made of laser groove.In the present embodiment, each major trough line 20 includes several intervals
The laser groove 201 of distribution;More specifically, each major trough line 20 is by a series of laser grooves 201 and between laser groove 201
Gap 202 collectively forms.In the other embodiments of the utility model, the set-up mode of major trough line 20 can also refer to existing
Some other design structures, and it is not limited to structure shown in fig. 8.
Refering to what is shown in Fig. 4, laser slotting patterning further includes several auxiliary line of rabbet joint 21 being made of laser groove, in conjunction with Fig. 5,
Shown in Fig. 6 or Fig. 7, each auxiliary line of rabbet joint 21 is all had where from 20 one end A of a major trough line towards 20 the other end of major trough line
Two parts that the direction of position extends, as shown in the figure, which includes first for being located at 20 two sides of major trough line
Divide 211 and second part 212.
In the embodiment shown in fig. 4, the laser slotting patterning at 200 back side of cell piece is in two major trough line 20 of outermost
The auxiliary line of rabbet joint 21 is provided at end positions.In implementation structure i.e. shown in Fig. 4, four auxiliary line of rabbet joint 21 are distributed in laser slotting figure
At four corner locations of case structure.
In the other embodiments of the utility model, the laser slotting patterning at 200 back side of cell piece can also be in Fig. 4
More auxiliary line of rabbet joint 21 (not shown) are set on the basis of shown.Specifically, in these embodiments, in each outermost major trough line
20 are directed toward laser slotting patterning interior direction, are provided with the auxiliary line of rabbet joint 21 at the 1st to n root major trough line 21 end positions,
Wherein, the value range of n is usual are as follows: 2≤n≤5.
The utility model is that the slotted line of part is designed to major trough line on the basis of conventional laser grooved pattern structure
20 structures combined with the auxiliary line of rabbet joint 21.Based on its specific implementation, in the application scenarios of two-sided PERC battery, when printing aluminium
When during grid line covering laser groove, if laser slotting patterning is close to the slotting position relative theory of the major trough line 20 in outside
There is inclination (due to deviation accumulation, outermost 20 inclined degree of major trough line usually maximum) in position, then do not cover to
The alum gate line of 20 end of major trough line can be covered to the auxiliary line of rabbet joint 21, so ensure that alum gate line passes through laser groove and cell piece 200
Silicon layer between have enough contacts area, the fill factor of cell piece 200 can be improved accordingly and reduce the string of cell piece
Join resistance, to realize the production of high-quality finished battery.
Since the inclined direction of the slotting position relative theory position of major trough line 20 is uncertain, for make no matter major trough line 20
Toward which direction, the auxiliary line of rabbet joint 21 can form corresponding 20 end of major trough line and preferably make up effect, usually be embodied
Cheng Zhong, it is that symmetry axis is symmetrical that each auxiliary line of rabbet joint 21, which is located at two parts of 20 two sides of major trough line with the major trough line 20,.With reference to figure
5, shown in Fig. 6, Fig. 7, first part 211 and second part 212 are that symmetry axis is symmetrical with major trough line 20.
Currently, the dimensions of silicon wafer is usually 156mm* in the related two-sided PERC battery of polysilicon in industry
156mm.Based on the specification, in the specific implementation process, it is 2- that each auxiliary line of rabbet joint 21, which is projected on the length range on major trough line 20,
3cm, with reference to shown in Fig. 5 to Fig. 7, i.e., the numberical range of D0 is 2-3cm;Each auxiliary line of rabbet joint 21 is located at two of 20 two sides of major trough line
Maximum distance range point corresponding major trough line 20 between is 100-200 μm, with reference to shown in Fig. 5 to Fig. 7, i.e. the number of D1, D2, D3
Being worth range is 100-200 μm.
In some specific embodiments of the utility model, with reference to shown in Fig. 5, Fig. 6, each auxiliary line of rabbet joint 21 is located at corresponding main
Two parts of 20 two sides of the line of rabbet joint are each parallel to the major trough line 20, i.e. first part 211 and second part 212 is each parallel to major trough line
20.In addition, each auxiliary line of rabbet joint 21 also has linkage section 210, the both ends of linkage section 210 are respectively connected to the auxiliary line of rabbet joint 21 and are located at major trough
20 two sides two parts of line are in the end on extending direction.
More specifically, in the embodiment shown in fig. 5, the auxiliary line of rabbet joint 21 is located at the first part 211 of 20 two sides of major trough line,
Two parts 212 are at right angles connect with linkage section 210 respectively in the end on extending direction;And in the embodiment shown in fig. 6, auxiliary slot
Line 21 be located at 20 two sides first part 211 of major trough line, second part 212 in the end on extending direction respectively with linkage section 210
In circular sliding slopes.
In other specific embodiments of the utility model, refering to what is shown in Fig. 7, each auxiliary line of rabbet joint 21 is located at corresponding major trough
The first parts 211 of 20 two sides of line and second part 212 are in gradually drawing close major trough line 20 on its extending direction.
To ensure that cell piece 200 has preferable electric current collection effect, for alum gate line and cell piece 200 on major trough line 20
The laser groove of silicon layer contacts also has following arrangement mode: refering to what is shown in Fig. 8, on the length direction of major trough line 20, per adjacent
The forming position relative misalignment of laser groove 201 on two major trough lines 20.
In some preferred embodiments, with further reference to shown in Fig. 8, the length of the laser groove 201 of major trough line 21 is constituted
Degree d2 range is 700-1100 μm, width d0 range is 25-50 μm;The interval of adjacent two laser groove 201 in same major trough line 21
D3 range is 100-700 μm;The distance between adjacent two major troughs line 20 d1 range is 700-900 μm.
In specific implementation process of the invention, with reference to shown in Fig. 5-Fig. 7, each auxiliary line of rabbet joint 21 is also possible to be arranged to
Including several auxiliary line of rabbet joint laser grooves (not indicating in figure) being spaced apart, the specific design size of auxiliary line of rabbet joint laser groove can also join
Examine the design size of major trough line laser slot 201.
Cell piece 200 provided in the present embodiment is two-sided PERC battery comprising the substrate being made of silicon wafer, substrate
The back side is formed with laser slotting patterning described above, the cell piece also have several intervals be arranged and extending direction with
The consistent conductive gate of 20 extending direction of major trough line (not shown in figure).In this present embodiment, conductive gate is alum gate line, covering
The laser groove of laser slotting patterning and by being electrically connected between laser groove and substrate.In specific implementation process,
Alum gate line mainly covers the laser groove 201 for constituting major trough line 20;When to generate certain position inclined for 20 relative theory position of major trough line
When shifting, alum gate line can be covered to the laser groove of the auxiliary line of rabbet joint 21, so that it is guaranteed that enough between alum gate line and substrate contact
Area.
It is understood that cell piece is not limited to two-sided PERC battery in the other embodiments of the utility model;Swash
Light grooved pattern structure can be formed in the back side of substrate, can also be formed in the front of substrate;By laser groove and substrate it
Between the conductive gate that is electrically connected be also possible to the structures such as electrode, and the alum gate line being not limited in above embodiments.
Solar components involved in the utility model have solar battery sheet described above.
In addition, although this specification is described in terms of embodiments, but not each embodiment only includes one only
Vertical technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should be by specification
As a whole, the technical solution in each embodiment may also be suitably combined to form those skilled in the art and can manage
The other embodiments of solution.
Tool of the series of detailed descriptions listed above only for the feasible embodiment of the utility model
Body explanation, they are all without departing from made by the utility model skill spirit not to limit the protection scope of the utility model
Equivalent implementations or change should be included within the scope of protection of this utility model.