CN209169153U - Laser slotting patterning, cell piece and solar photovoltaic assembly - Google Patents

Laser slotting patterning, cell piece and solar photovoltaic assembly Download PDF

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Publication number
CN209169153U
CN209169153U CN201821816200.4U CN201821816200U CN209169153U CN 209169153 U CN209169153 U CN 209169153U CN 201821816200 U CN201821816200 U CN 201821816200U CN 209169153 U CN209169153 U CN 209169153U
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China
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line
major trough
laser
rabbet joint
patterning
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CN201821816200.4U
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Chinese (zh)
Inventor
曹琨
张标
袁中存
费正洪
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Funing Atlas Sunshine Power Technology Co Ltd
Canadian Solar Inc
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CSI GCL Solar Manufacturing Yancheng Co Ltd
Atlas Sunshine Power Group Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/547Monocrystalline silicon PV cells

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Abstract

The utility model discloses a kind of laser slotting patternings, cell piece and solar photovoltaic assembly, laser slotting patterning involved in it includes the major trough line that several intervals are arranged and are made of laser groove, the laser slotting patterning further includes several auxiliary line of rabbet joint being made of laser groove, each auxiliary line of rabbet joint all has the two parts for extending and being located at the major trough line two sides towards the direction of major trough line the other end position described in this from a major trough line one end, 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;Specific design based on laser slotting patterning, in the concrete application scene of two-sided PERC battery, it can ensure that alum gate line passes through between laser groove and the silicon layer of cell piece with enough contacts area, the fill factor of cell piece can be improved and reduce the series resistance of cell piece accordingly, to realize the production of high-quality finished battery.

Description

Laser slotting patterning, cell piece and solar photovoltaic assembly
Technical field
The utility model relates to solar battery manufacturing field more particularly to a kind of laser slotting patternings, cell piece And solar photovoltaic assembly.
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.
Detailed description of the invention
Fig. 1 show the schematic diagram of existing design cell piece backside laser grooved pattern structure;
Fig. 2 show the first amplified form schematic diagram of the part a in Fig. 1;
Fig. 3 show amplified second of form schematic diagram in the part a in Fig. 1;
Fig. 4 show a kind of embodiment of the utility model cell piece backside laser grooved pattern structure;
Fig. 5 show the first of the auxiliary line of rabbet joint and the cooperation of major trough line in the utility model and implements structure;
Fig. 6 show second of implementation structure of the auxiliary line of rabbet joint and the cooperation of major trough line in the utility model;
Fig. 7 show the third of the auxiliary line of rabbet joint and the cooperation of major trough line in the utility model and implements structure;
Fig. 8 show b enlarged schematic partial view in Fig. 4.
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.

Claims (12)

1. a kind of laser slotting patterning, the major trough line for being arranged and being made of laser groove including several intervals, which is characterized in that The laser slotting patterning further includes several auxiliary line of rabbet joint being made of laser groove, and each auxiliary line of rabbet joint all has from an institute The direction for stating major trough line one end towards major trough line the other end position described in this extends and is located at the major trough line two Two parts of side, the laser slotting patterning to be less than at the end positions of major trough line described in outermost two be provided with it is described The auxiliary line of rabbet joint.
2. laser slotting patterning according to claim 1, which is characterized in that the major trough line described in each outermost refers to To on the direction on the inside of the laser slotting patterning, it is provided at the 1st to the end positions of major trough line described in n root described The auxiliary line of rabbet joint, wherein 2≤n≤5.
3. laser slotting patterning according to claim 1, which is characterized in that each auxiliary line of rabbet joint is located at the master Two parts of line of rabbet joint two sides are symmetrical as symmetry axis using major trough line described in this.
4. laser slotting patterning according to claim 3, which is characterized in that each auxiliary line of rabbet joint is projected on described Length range on major trough line is 2-3cm, each auxiliary line of rabbet joint be located at major trough line two sides two parts and it is corresponding described in Maximum distance range between major trough line is 100-200 μm.
5. laser slotting patterning according to claim 3 or 4, which is characterized in that each auxiliary line of rabbet joint is located at phase Answer two parts of major trough line two sides each parallel to major trough line described in this, each auxiliary line of rabbet joint also has linkage section, described The both ends of linkage section are respectively connected to the auxiliary line of rabbet joint and are located at major trough line two sides two parts in the end on extending direction.
6. laser slotting patterning according to claim 5, which is characterized in that the auxiliary line of rabbet joint is located at the major trough line Two sides two parts at right angles connect with the linkage section in the end on extending direction or in circular sliding slopes.
7. laser slotting patterning according to claim 3 or 4, which is characterized in that each auxiliary line of rabbet joint is located at phase Answer two parts of major trough line two sides in gradually drawing close the major trough line on its extending direction.
8. laser slotting patterning according to any one of claims 1-4, which is characterized in that each major trough line And each auxiliary line of rabbet joint includes several laser grooves being spaced apart.
9. laser slotting patterning according to claim 8, which is characterized in that the length direction of Yu Suoshu major trough line On, the forming position relative misalignment of laser groove on every adjacent two major trough line.
10. laser slotting patterning according to claim 8, which is characterized in that constitute the laser groove of the major trough line Length range be 700-1100 μm, width range is 25-50 μm, the interval model of adjacent two laser groove in same major trough line Enclosing is 100-700 μm, and the distance between adjacent two described major trough line range is 700-900 μm.
11. a kind of cell piece, including substrate, which is characterized in that the substrate is formed to a surface is less than just like claim 1- Laser slotting patterning described in 10 any one, the cell piece also have several intervals be arranged and extending direction with it is described The consistent conductive gate of major trough line extending direction, the conductive gate cover the laser groove of the laser slotting patterning and pass through institute It states and is electrically connected between laser groove and the substrate.
12. a kind of solar components, which is characterized in that the solar components have cell piece described in claim 11.
CN201821816200.4U 2018-11-05 2018-11-05 Laser slotting patterning, cell piece and solar photovoltaic assembly Active CN209169153U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110854042A (en) * 2019-11-12 2020-02-28 苏州迈为科技股份有限公司 Solar cell splitting method and system
CN111668339A (en) * 2020-04-23 2020-09-15 天津爱旭太阳能科技有限公司 Solar cell front electrode alignment printing method and preparation method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110854042A (en) * 2019-11-12 2020-02-28 苏州迈为科技股份有限公司 Solar cell splitting method and system
CN111668339A (en) * 2020-04-23 2020-09-15 天津爱旭太阳能科技有限公司 Solar cell front electrode alignment printing method and preparation method

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Address after: No. 88 Xiexin Avenue, Funing Economic Development Zone, Yancheng City, Jiangsu Province

Co-patentee after: CSI SOLAR POWER GROUP Co.,Ltd.

Patentee after: Funing atlas sunshine Power Technology Co., Ltd

Address before: 224400 No. 88 Xiexin Avenue, Funing Economic Development Zone, Yancheng City, Jiangsu Province

Co-patentee before: CSI SOLAR POWER GROUP Co.,Ltd.

Patentee before: CSI-GCL SOLAR MANUFACTURING (YANCHENG) Co.,Ltd.

CP01 Change in the name or title of a patent holder
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Address after: No.88, Xiexin Avenue, Funing Economic Development Zone, Yancheng City, Jiangsu Province

Patentee after: Funing atlas sunshine Power Technology Co., Ltd

Patentee after: Atlas sunshine Power Group Co.,Ltd.

Address before: No.88, Xiexin Avenue, Funing Economic Development Zone, Yancheng City, Jiangsu Province

Patentee before: Funing atlas sunshine Power Technology Co., Ltd

Patentee before: CSI SOLAR POWER GROUP Co.,Ltd.