CN103426940B - A kind of staggered back contacts IBC solar battery sheet electrode structure - Google Patents

A kind of staggered back contacts IBC solar battery sheet electrode structure Download PDF

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CN103426940B
CN103426940B CN201310093132.9A CN201310093132A CN103426940B CN 103426940 B CN103426940 B CN 103426940B CN 201310093132 A CN201310093132 A CN 201310093132A CN 103426940 B CN103426940 B CN 103426940B
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positive
electrode
negative
cell piece
gate line
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CN103426940A (en
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何宝华
何涛
徐传明
杜军伟
王慧
赵邦桂
周利荣
张忠卫
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LIANYUNGANG SHENZHOU NEW ENERGY CO Ltd
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LIANYUNGANG SHENZHOU NEW ENERGY CO Ltd
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Abstract

The present invention is a kind of staggered back contacts IBC solar battery sheet electrode structure, it is characterised in that: the back side of described cell piece is provided with the positive and negative gate line electrode that fourchette is staggered;Insulated by laser ablation or insulating cement mode between positive and negative gate line electrode;The all positive and negative gate line electrodes in the back side converge on strip or block positive and negative contact electrode respectively;Positive and negative contact electrode is coupled by conduction welding, uses insulated rubber film to carry out isolated insulation between conduction welding and the positive and negative gate line electrode of bulk.The positive and negative contact electrode of two pieces of cell pieces can be made point-blank by adjacent cell sheet rotation turnback being placed, the conduction welding of conventional linear shape can be used to realize being welded to connect of IBC cell piece, simple and convenient, safe and reliable, both artistic and practical, it is adaptable to commercial application;Improve the photoelectric transformation efficiency of large scale cell piece, it is achieved staggered back contacts IBC cell piece is to 6 inches or the development of more large scale cell piece.

Description

A kind of staggered back contacts IBC solar battery sheet electrode structure
Technical field
The present invention relates to a kind of solar battery sheet, particularly a kind of staggered back contacts IBC solar battery sheet electrode structure, belong to solar-photovoltaic technology field.
Background technology
Solar energy is a kind of cleaning, efficiently and the new forms of energy of never exhaustion, is one of important regenerative resource, day by day serious along with energy crisis and environmental pollution, and exploitation regenerative resource becomes the strategic decision of the countries in the world sustainable development energy.In Application of Solar Energy, photovoltaic generation as one of the important way of Application of Solar Energy, its noiselessness, non-maintaining, be just gradually gained popularity without advantages such as discharges.At present, based on crystal silicon solar energy battery in photovoltaic generation, this has extremely abundant reserves, photovoltaic power generation technology relative maturity mainly due to silicon materials in the earth's crust, cost relatively low and, compare other type of commercial cells and there is of a relatively high conversion efficiency.High conversion efficiency is the development trend of current crystal silicon solar energy battery, by selective emitter technology, front and rear surfaces passivation etc. improves the conversion efficiency of solaode, but owing to it needs special equipment and complicated technological process, industrialization process is restricted.
Reducing front surface grid line and conduction the blocking of welding by the change of cell piece electrode position and structure, development back contact battery sheet is current one of important channel promoting cell piece conversion efficiency.The back contact battery sheet of industrialization mainly has two classes among these, one class is metal piercing winding technique (MWT), though the conversion efficiency of cell piece can be promoted by this technology certain help, the high conversion efficiency of industrialization at present is less than 20%, owing to it can not be completely eliminated blocking of cell piece surface, there is certain bottleneck in the raising that continues of efficiency.An other class is staggered back contacts technology (IBC), this technology can make cell piece surface without any grid line and conduction welding, completely eliminate the grid line on cell piece surface and blocking of conduction welding, positive and negative electrode is designed at the back side of cell piece, the electrode of contact launch site is interspersed with the electrode contacting base, thus the full surface of cell piece is played and is accepted illumination, it is possible to more effectively collect photo-generated carrier, make energy conversion efficiency be greatly improved.IBC cell piece has realized industrialization and has been up to the conversion efficiency of 24.2%, and this conversion efficiency occupies first of the crystal silicon battery that all industrialization produce at present, is the important directions of following high-efficiency battery development.
The most staggered back contact battery sheet of industrialization only produces with 5 inch silicon wafer, when using 6 inches or larger sized silicon chip produces, owing to the change of cell piece area is big thus the electric current of cell piece becomes big and back side gate line electrode length, gate line electrode causes more serious power loss, the efficiency causing whole cell piece declines, and hardly results in the conversion efficiency identical with 5 inches of cell pieces.Consider from loss in efficiency economic aspect so that 5 inches of staggered back contact battery chip technologies should not develop to 6 inches or larger sized cell piece.
Summary of the invention
The technical problem to be solved there is provided a kind of reasonable in design, can be more than the staggered back contacts IBC solar battery sheet electrode structure of 5 inches.
The technical problem to be solved is also to be realized by following technical scheme.The present invention is a kind of staggered back contacts IBC solar battery sheet electrode structure, is characterized in: the back side of described cell piece is provided with the positive and negative gate line electrode that fourchette is staggered;Insulated by laser ablation or insulating cement mode between positive and negative gate line electrode;The all positive and negative gate line electrodes in the back side converge on strip or block positive and negative contact electrode respectively;Positive and negative contact electrode is coupled by conduction welding, uses insulated rubber film to carry out isolated insulation between conduction welding and the positive and negative gate line electrode of bulk.
In staggered back contacts IBC solar battery sheet electrode structure of the present invention: described positive and negative gate line electrode preferably employs the segmented electrodes on non-through whole cell piece surface.The advantage of segmented electrodes is the reduction of electrical power loss on gate line electrode, makes the photogenerated current of cell piece be collected as early as possible.
In staggered back contacts IBC solar battery sheet electrode structure of the present invention: adjacent cell sheet is rotated 180 ° of placements, and the positive and negative contact electrode of two pieces of cell pieces is point-blank.Described strip-shaped contact electrode width is more than the width of conduction welding, and the electric current on the identical polar gate line electrode being attached thereto can be collected, positive and negative contact electrode can be realized after cell piece is revolved turnback point-blank, and use conduction welding to carry out weld connection.Described block contact electrode is evenly distributed on the cell piece back side, after a piece of rotation turnback in two panels cell piece, realize the bulk positive and negative contact electrode of two pieces of cell pieces point-blank, strip or block insulation glue-film stickup by punching are at two pieces of cell piece back sides, again conduction welding is welded on block contact electrode, realize the electrical connection of two panels cell piece, insulated rubber film serves isolation conduction welding and the cell piece back side and interlocks the effect of gate line electrode, in addition run through the insulated rubber film between two cell pieces to also act and hide conduction welding and beautify the effect of component facade.
In staggered back contacts IBC solar battery sheet electrode structure of the present invention: the quantity of strip positive and negative contact electrode is preferably 2-20 root, the quantity of block positive and negative contact electrode is preferably 6-200.
In staggered back contacts IBC solar battery sheet electrode structure of the present invention: having on described insulated rubber film and positive and negative with bulk contact the corresponding electrode window through ray of electrode, insulated rubber film has single or double cementability.
In staggered back contacts IBC solar battery sheet electrode structure of the present invention: the thickness of described insulated rubber film is preferably 20-160 micron, and width is preferably 5-156 millimeter.
Further preferred technical scheme is: when the cell piece of this electrode structure uses welding procedure to couple, and described block contact electrode is identical for conduction welding coupling direction for being shaped as rectangle and its long side direction;When the cell piece of this electrode structure uses flexible PCB to couple, the block contact preferred scheme of electrode is circular.
Compared with prior art, the present invention has the advantage that
1. the present invention is by designing the electrode structure of fourchette back contacts IBC solar battery sheet, electrical power loss on fourchette back contacts gate line electrode can be reduced, improve the photoelectric transformation efficiency of large scale cell piece, realize 5 inches of staggered back contacts IBC cell pieces to develop to 6 inches or larger sized cell piece, there is positive realistic meaning.
2. the present invention can realize the multiple connecting mode of fourchette back contacts IBC cell piece by the design of electrode structure, by adjacent cell sheet rotation turnback is placed, make the positive and negative contact electrode of two pieces of cell pieces point-blank, the conduction welding of conventional shape can be used to realize the weld connection of IBC cell piece.Simple and convenient, it is adaptable to commercial application.
3. the insulated rubber film design of the present invention, it is possible to play conduction welding and the buffer action of cell piece gate line electrode very well, conduction welding can also be blocked in addition, play the effect of aesthetic appeal, safe and reliable, both artistic and practical.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the another kind of structural representation of the present invention;
Fig. 3 is a kind of structural representation of cell piece interconnection in the present invention;
Fig. 4 is the another kind of structural representation of the cell piece interconnection in the present invention;
Fig. 5 is the partial sectional view of Fig. 2;
Wherein, 1, just (or negative) gate line electrode;2, bear (or just) gate line electrode;3, strip negative (or just) contact electrode;4, strip just (or negative) contact electrode;5, block negative (or just) contact electrode;6, bulk just (or negative) contact electrode;7 conduction weldings;8 insulated rubber films.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1, with reference to Fig. 1-5, a kind of staggered back contacts IBC solar battery sheet electrode structure, the back side of described cell piece is provided with the positive and negative gate line electrode (1,2) that fourchette is staggered;Insulated by laser ablation or insulating cement mode between positive and negative gate line electrode (1,2);The all positive and negative gate line electrodes in the back side (1,2) converges on strip or block positive and negative contact electrode (3,4,5,6) respectively;Positive and negative contact electrode is coupled by conduction welding 7, uses insulated rubber film 8 to carry out isolated insulation between conduction welding 7 and the positive and negative gate line electrode of bulk (5,6).
Embodiment 2, in the staggered back contacts IBC solar battery sheet electrode structure described in embodiment 1: described positive and negative gate line electrode (1,2) uses the segmented electrodes on non-through whole cell piece surface.
Embodiment 3, in the staggered back contacts IBC solar battery sheet electrode structure described in embodiment 1: adjacent cell sheet is rotated 180 ° of placements, and the positive and negative contact electrode of two pieces of cell pieces is point-blank.
Embodiment 4, in the staggered back contacts IBC solar battery sheet electrode structure described in embodiment 1: the quantity of strip positive and negative contact electrode (3,4) is 2-20 root, the quantity of block positive and negative contact electrode (5,6) is 6-200.
Embodiment 5, in the staggered back contacts IBC solar battery sheet electrode structure described in embodiment 1: having on described insulated rubber film 8 and positive and negative with bulk contact electrode (5,6) corresponding electrode window through ray, insulated rubber film 8 has single or double cementability.
Embodiment 6, in the staggered back contacts IBC solar battery sheet electrode structure described in embodiment 1 or 5: the thickness of described insulated rubber film 8 is 20-160 micron, and width is 5-156 millimeter.
Embodiment 7, in staggered back contacts IBC solar battery sheet electrode structure described in embodiment 1: when cell piece uses welding procedure to couple, described bulk positive and negative contact electrode (5,6) be shaped as rectangle and its long side direction with conduction welding 7 coupling direction identical.
Embodiment 8, in the staggered back contacts IBC solar battery sheet electrode structure described in embodiment 1: when cell piece uses flexible PCB to couple, block positive and negative contact electrode (5,6) is circular.
Embodiment 9, see Fig. 1, shown in 3, a kind of back electrode structure of fourchette back contacts IBC solar battery sheet, the back side of described cell piece is provided with positive and negative gate line electrode (1,2), isolated insulation is carried out by laser ablation or insulating cement between positive and negative gate line electrode (1,2), each two of the positive and negative contact electrode with positive and negative gate line electrode (1,2) orthogonal connection;Each positive and negative contact electrode arrangements is on two limits of cell piece, and remaining two are arranged in the middle of these two contact electrodes, and contact electrode and connects between the gate line electrode of same polarity insulate between the gate line electrode of non-equal polarity, as shown in Figure 1 respectively.
Following steps are taked in the above-mentioned connection between two panels fourchette back contacts IBC solar battery sheet:
(1) the most a piece of cell piece is revolved turnback, make the positive and negative contact electrode of two pieces of cell pieces point-blank;
(2) use width, less than the conduction welding 7 of contact electrode width, the positive and negative contact electrode of two panels cell piece is carried out weld connection, conduction welding is remained above the spacing of 0.5 millimeter with the long limit contacting electrode, it is ensured that conduction welding and the isolation of cell piece surface gate line electrode.As it is shown on figure 3, the like can realize the connection between a string cell piece.
Embodiment 10, see Fig. 2, 4, shown in 5, a kind of back electrode structure of fourchette back contacts IBC solar battery sheet, the back side of described cell piece is provided with positive and negative gate line electrode (1, 2), positive and negative gate line electrode (1, 2) isolated insulation is carried out by laser ablation or insulating cement between, positive and negative gate line electrode (1, 2) arrange in 20 bulk positive and negative contact electrodes (5, 6), the positive and negative gate line electrode (1 of identical polar, 2) the block contact electrode (5 that nearest polarity is identical is conducted the current to, 6) on, block contact electrode (5, 6) with the positive and negative gate line electrode (1 of non-equal polarity about, 2) insulation is kept between, as shown in Figure 2.
Following steps are taked in the above-mentioned connection between two panels fourchette back contacts IBC solar battery sheet:
(1) the most a piece of cell piece is revolved turnback, make the positive and negative contact electrode of two pieces of cell pieces point-blank;
(2) the strip insulated rubber film 8 of punching is pasted onto on arrangement positive and negative contact electrode point-blank, the width of strip insulated rubber film 8 is more than the width of contact electrode, the position making positive and negative electrode is corresponding with punch position, contact electrode is exposed, and contacts the area of electrode slightly larger than perforated area;
(3) conduction welding 7 is laid on insulated rubber film 8, by on the positive and negative contact electrode being welded on two panels cell piece of electric welding, the border of conduction welding and insulated rubber film is remained above the spacing of 0.5 millimeter, it is ensured that conduction welding and the isolation of cell piece surface gate line electrode.As shown in Figure 4, welded section as it is shown in figure 5, the like can realize the connection between a string cell piece.

Claims (4)

1. a staggered back contacts IBC solar battery sheet electrode structure, it is characterised in that: the back side of described cell piece is provided with finger The positive and negative gate line electrode that fork is staggered;Insulated by laser ablation or insulating cement mode between positive and negative gate line electrode;The back side owns Positive and negative gate line electrode converges on strip or block positive and negative contact electrode respectively;Positive and negative contact electrode is coupled by conduction welding, Insulated rubber film is used to carry out isolated insulation between conduction welding and the positive and negative gate line electrode of bulk;
Described positive and negative gate line electrode uses the segmented electrodes on non-through whole cell piece surface;
Adjacent cell sheet is rotated 180 ° of placements, and the positive and negative contact electrode of two pieces of cell pieces is point-blank;
The quantity of strip positive and negative contact electrode is 2-20 root, and the quantity of block positive and negative contact electrode is 6-200;
Having on described insulated rubber film and positive and negative with bulk contact the corresponding electrode window through ray of electrode, it is bonding that insulated rubber film has single or double Property.
Staggered back contacts IBC solar battery sheet electrode structure the most according to claim 1, it is characterised in that: described is exhausted The thickness of edge glued membrane is 20-160 micron, and width is 5-156 millimeter.
Staggered back contacts IBC solar battery sheet electrode structure the most according to claim 1, it is characterised in that: cell piece makes Couple by welding procedure, described bulk positive and negative contact electrode be shaped as rectangle and its long side direction and conduction welding coupling direction Identical.
Staggered back contacts IBC solar battery sheet electrode structure the most according to claim 1, it is characterised in that: cell piece makes Coupling with flexible PCB, block positive and negative contact electrode is circular.
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CN103762083A (en) * 2013-12-25 2014-04-30 中国科学院等离子体物理研究所 Dye-sensitized solar cell for collecting electrons in back contact mode
CN103811565B (en) * 2014-02-17 2016-03-16 英利能源(中国)有限公司 A kind of solar cell, assembly and preparation method thereof
CN103872181B (en) * 2014-03-26 2017-05-31 苏州阿特斯阳光电力科技有限公司 A kind of method for metallising of back contacts solar cell
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CN105742375B (en) * 2014-12-10 2017-09-22 北京创昱科技有限公司 A kind of back contacts crystal silicon battery and preparation method thereof
CN107004730B (en) * 2014-12-15 2019-10-08 Imec 非营利协会 Method for interconnecting back contacts photovoltaic cell
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CN106252466B (en) * 2016-09-20 2018-03-20 深圳市科纳能薄膜科技有限公司 A kind of back contacts hetero-junctions monocrystaline silicon solar cell and preparation method thereof
CN106876486B (en) * 2017-03-24 2018-11-09 浙江隆基乐叶光伏科技有限公司 String formation connection structure, component and the method for P-type crystal silicon back contacts double-side cell
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CN111477718A (en) * 2019-10-22 2020-07-31 国家电投集团西安太阳能电力有限公司 Simple IBC battery electrode manufacturing process

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