CN103426940A - Electrode structure of interlaced back contact (IBC) solar cell - Google Patents
Electrode structure of interlaced back contact (IBC) solar cell Download PDFInfo
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- CN103426940A CN103426940A CN2013100931329A CN201310093132A CN103426940A CN 103426940 A CN103426940 A CN 103426940A CN 2013100931329 A CN2013100931329 A CN 2013100931329A CN 201310093132 A CN201310093132 A CN 201310093132A CN 103426940 A CN103426940 A CN 103426940A
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- 238000009413 insulation Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
- 238000000608 laser ablation Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 229910000679 solder Inorganic materials 0.000 abstract 3
- 238000010329 laser etching Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000013083 solar photovoltaic technology Methods 0.000 description 1
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Abstract
The present invention relates to an electrode structure of an IBC solar cell. The electrode structure of the IBC solar cell is characterized in that inter-digital interlaced positive/negative grid line electrodes are arranged on the backside of the solar cell, the positive/negative grid line electrodes are insulated in a laser etching or insulation paste manner, and all the positive/negative grid line electrodes on the backside are gathered on the strip-like or block-like positive/negative contact electrodes respectively; the positive/negative contact electrodes are connected via conductive solder strips, and the conductive solder strips and the block-like positive/negative grid line electrodes are isolated and insulated via the insulation paste film. The positive/negative contact electrodes of the two solar cells can be in a straight line by rotating the adjacent solar cells 180 degrees and then placing the adjacent solar cells, and the IBC solar cells can be soldered and connected via the routine linear conductive solder strips, so that the electrode structure of the IBC solar cell is simple, convenient, safe, reliable, beautiful and practical and is suitable for the industrialization application, the photoelectric conversion efficiency of the large-size cells is improved, and the development from the IBC cell to the cell of 6 inches or a larger size is realized.
Description
Technical field
The present invention relates to a kind of solar battery sheet, particularly a kind of staggered back of the body contact IBC solar battery sheet electrode structure, belong to the solar-photovoltaic technology field.
Background technology
Solar energy is a kind of clean, new forms of energy of exhaustion efficiently and never, is one of important regenerative resource, and day by day serious along with energy crisis and environmental pollution developed the strategic decision that regenerative resource becomes the countries in the world sustainable development energy.In Application of Solar Energy, photovoltaic generation is as one of important way of Application of Solar Energy, its noiselessness, non-maintaining, without advantages such as discharges, just be gradually gained popularity.At present, take crystal silicon solar energy battery as main in photovoltaic generation, and this is mainly that very abundant reserves are arranged in the earth's crust due to silicon materials, and photovoltaic power generation technology is relatively ripe, cost lower and, the commercialization battery of comparing other type has relatively high conversion efficiency.High conversion efficiency is the development trend of current crystal silicon solar energy battery, by the selective emitter technology, front and rear surfaces passivation etc. improves the conversion efficiency of solar cell, but, because it needs special equipment and complicated technological process, industrialization process is restricted.
Change by cell piece electrode position and structure reduces blocking of front surface grid line and conduction welding, and development back of the body contact cell piece is one of important channel of current lifting cell piece conversion efficiency.This wherein the back of the body contact cell piece of industrialization mainly contain two classes, one class is metal piercing coiling technology (MWT), though this technology can promote certain help is arranged the conversion efficiency of cell piece, the high conversion efficiency of at present industrialization is lower than 20%, because it can not eliminate blocking of cell piece surface fully, there is certain bottleneck in the continuation of efficiency raising.An other class is staggered back of the body contact technique (IBC), this technology can make the cell piece surface without any grid line and conduction welding, the grid line on cell piece surface and blocking of conduction welding have been eliminated fully, the back side by the positive and negative electrode design at cell piece, the electrode of contact emitter region is interspersed with the electrode that contacts base, thereby the full surface of cell piece is played and is accepted illumination, can more effective collection photo-generated carrier, energy conversion efficiency is greatly improved.The IBC cell piece has realized that industrialization is up to 24.2% conversion efficiency, 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 staggered back of the body of industrialization contacts cell piece only with 5 inches silicon chip productions at present, when 6 inches of uses or the production of larger sized silicon chip, thereby the electric current that becomes large cell piece due to the cell piece area becomes large and back side gate line electrode length is elongated, cause more serious power loss on gate line electrode, cause the decrease in efficiency of whole cell piece, be difficult to obtain and 5 inches conversion efficiencies that cell piece is identical.From the loss in efficiency economic aspect, consider, making 5 inches staggered back ofs the body contact the cell piece technology should not be to 6 inches or the development of larger sized cell piece.
Summary of the invention
Technical problem to be solved by this invention has been to provide a kind of reasonable in design, can be greater than the staggered back of the body contact IBC solar battery sheet electrode structure of 5 inches.
Technical problem to be solved by this invention is also to realize by following technical scheme.The present invention is a kind of staggered back of the body contact IBC solar battery sheet electrode structure, and be characterized in: the back side of described cell piece is provided with the staggered positive and negative gate line electrode of fourchette; Between positive and negative gate line electrode, by laser ablation or insulating cement mode, insulated; The all positive and negative gate line electrodes in the back side converge in respectively on strip or block positive and negative contact electrode; Positive and negative contact electrode connects by the conduction welding, uses insulated rubber film between conduction welding and block positive and negative gate line electrode, carrying out isolated insulation.
In staggered back of the body contact IBC solar battery sheet electrode structure of the present invention: described positive and negative gate line electrode preferably adopts the non-segmented electrode that runs through whole cell piece surface.The advantage of segmented electrode is to have reduced the loss of electrical power on gate line electrode, and the photogenerated current of cell piece is collected as early as possible.
In staggered back of the body contact IBC solar battery sheet electrode structure of the present invention: by ° placement of adjacent cell sheet Rotate 180, the positive and negative contact electrode of two cell pieces point-blank.Described strip contact electrode width is greater than the width of conduction welding, and can collect the electric current on the identical polar gate line electrode be attached thereto, to after cell piece Rotate 180 degree, can realize positive and negative contact electrode point-blank, and use the conduction welding to carry out weld connection.Described block contact electrode is evenly distributed on the cell piece back side, by after a slice Rotate 180 degree in two cell pieces, realize the positive and negative contact electrode of bulk of two cell pieces point-blank, by by the punching strip or the block insulation glue-film stickup at two cell piece back sides, the welding that will conduct electricity again is welded on block contact electrode, realize the electrical connection of two cell pieces, insulated rubber film has played the effect of the staggered gate line electrode of isolate conductive welding and the cell piece back side, running through in addition two insulated rubber films between cell piece has also played and hides the conduction welding and beautify the effect of assembly outward appearance.
In staggered back of the body contact IBC solar battery sheet electrode structure of the present invention: the quantity of the positive and negative contact electrode of strip is preferably the 2-20 root, and the quantity of block positive and negative contact electrode is preferably 6-200.
In staggered back of the body contact IBC solar battery sheet electrode structure of the present invention: on described insulated rubber film, have and the corresponding electrode window through ray of the positive and negative contact electrode of bulk, insulated rubber film has the single or double cementability.
In staggered back of the body contact IBC solar battery sheet electrode structure of the present invention: the thickness of described insulated rubber film is preferably the 20-160 micron, and width is preferably the 5-156 millimeter.
Further preferred technical scheme is: when the cell piece of this electrode structure is used welding procedure to connect, 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 is used flexible PCB to be connected, the preferred scheme of block contact electrode is circular.
Compared with prior art, the present invention has following advantages:
1. the present invention is by the electrode structure of design fourchette back of the body contact IBC solar battery sheet, can reduce the loss of electrical power on fourchette back of the body contact gate line electrode, improve the photoelectric conversion efficiency of large scale battery sheet, realize that 5 inches staggered back of the body contact IBC cell pieces, to 6 inches or the development of larger sized cell piece, have positive realistic meaning.
2. the present invention can realize the multiple connecting mode of fourchette back of the body contact IBC cell piece by the design of electrode structure, by adjacent cell sheet Rotate 180 degree is placed, make the positive and negative contact electrode of two cell pieces point-blank, can use the conduction welding of conventional shape to realize the weld connection of IBC cell piece.Simple and convenient, be applicable to commercial application.
3. insulated rubber film of the present invention designs, and can finely play the buffer action of conduction welding and cell piece gate line electrode, can also block the conduction welding in addition, plays the effect that beautifies outward appearance, safe and reliable, both artistic and practical.
The accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is another kind of structural representation of the present invention;
Fig. 3 is the interconnected a kind of structural representation of cell piece in the present invention;
Fig. 4 is the interconnected another kind of structural representation of the cell piece in the present invention;
Fig. 5 is the partial sectional view of Fig. 2;
(or negative) gate line electrode wherein, 1, just; 2, negative (or just) gate line electrode; 3, negative (or just) contact electrode of strip; 4, strip (or negative) contact electrode just; 5, block negative (or just) contact electrode; 6, bulk (or negative) contact electrode just; 7 conduction weldings; 8 insulated rubber films.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 9, shown in Fig. 1,3, a kind of back electrode structure of fourchette back of the body contact IBC solar battery sheet, the back side of described cell piece is provided with positive and negative gate line electrode (1,2), between positive and negative gate line electrode (1,2), by laser ablation or insulating cement, carry out isolated insulation, each two of the positive and negative contact electrodes connected with positive and negative gate line electrode (1,2) quadrature; Each positive and negative contact electrode is arranged on two limits of cell piece, and all the other two are arranged in the middle of these two contact electrodes, contact electrode respectively with the gate line electrode of same polarity between be communicated with and the gate line electrode of non-identical polar between insulated, as shown in Figure 1.
Following steps are taked in connection between two above-mentioned fourchette back of the body contact IBC solar battery sheets:
(1) incite somebody to action wherein a slice cell piece Rotate 180 degree, make the positive and negative contact electrode of two cell pieces point-blank;
(2) the conduction welding 7 that uses width to be less than the contact electrode width carries out weld connection by the positive and negative contact electrode of two cell pieces, the long limit of conduction welding and contact electrode keeps being greater than the spacing of 0.5 millimeter, guarantees the isolation of conduction welding and cell piece surface gate line electrode.As shown in Figure 3, the like can realize the connection between a string cell piece.
Embodiment 10, referring to Fig. 2, 4, shown in 5, a kind of back electrode structure of fourchette back of the body contact 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) between, by laser ablation or insulating cement, carry out isolated insulation, positive and negative gate line electrode (1, 2) 20 the positive and negative contact electrodes (5 of bulk of arranging in, 6), the positive and negative gate line electrode (1 of identical polar, 2) conduct the current to the block contact electrode (5 that nearest polarity is identical, 6) on, block contact electrode (5, 6) with the positive and negative gate line electrode (1 of non-identical polar around it, 2) keep insulation between, as shown in Figure 2.
Following steps are taked in connection between two above-mentioned fourchette back of the body contact IBC solar battery sheets:
(1) incite somebody to action wherein a slice cell piece Rotate 180 degree, make the positive and negative contact electrode of two cell pieces point-blank;
(2) the strip insulated rubber film 8 of punching is sticked on the positive and negative contact electrode of arranging point-blank, the width of strip insulated rubber film 8 is greater than the width of contact electrode, make the position of positive and negative electrode corresponding with punch position, contact electrode is exposed, and the area of contact electrode is slightly larger than perforated area;
(3) will conduct electricity welding 7 is laid on insulated rubber film 8, to arrive on the positive and negative contact electrode that is welded on two cell pieces of electric welding, the spacing that the Edge keeping of conduction welding and insulated rubber film is greater than 0.5 millimeter, guarantee the isolation of conduction welding and cell piece surface gate line electrode.As shown in Figure 4, welded section as shown in Figure 5, the like can realize the connection between a string cell piece.
Claims (8)
1. a staggered back of the body contacts IBC solar battery sheet electrode structure, it is characterized in that: the back side of described cell piece is provided with the staggered positive and negative gate line electrode of fourchette; Between positive and negative gate line electrode, by laser ablation or insulating cement mode, insulated; The all positive and negative gate line electrodes in the back side converge in respectively on strip or block positive and negative contact electrode; Positive and negative contact electrode connects by the conduction welding, uses insulated rubber film between conduction welding and block positive and negative gate line electrode, carrying out isolated insulation.
2. staggered back of the body contact IBC solar battery sheet electrode structure according to claim 1, is characterized in that: the non-segmented electrode that runs through whole cell piece surface of described positive and negative gate line electrode employing.
3. the staggered back of the body according to claim 1 contacts IBC solar battery sheet electrode structure, and it is characterized in that: by ° placement of adjacent cell sheet Rotate 180, the positive and negative contact electrode of two cell pieces point-blank.
4. the staggered back of the body according to claim 1 contacts IBC solar battery sheet electrode structure, and it is characterized in that: the quantity of the positive and negative contact electrode of strip is the 2-20 root, and the quantity of block positive and negative contact electrode is 6-200.
5. the staggered back of the body according to claim 1 contacts IBC solar battery sheet electrode structure, and it is characterized in that: on described insulated rubber film, have and the corresponding electrode window through ray of the positive and negative contact electrode of bulk, insulated rubber film has the single or double cementability.
6. the staggered back of the body contacts IBC solar battery sheet electrode structure according to claim 1 or 5, and it is characterized in that: the thickness of described insulated rubber film is the 20-160 micron, and width is the 5-156 millimeter.
7. the staggered back of the body according to claim 1 contacts IBC solar battery sheet electrode structure, it is characterized in that: when cell piece is used welding procedure to connect, the positive and negative contact electrode of described bulk be shaped as rectangle and its long side direction and to conduct electricity the welding coupling direction identical.
8. the staggered back of the body according to claim 1 contacts IBC solar battery sheet electrode structure, it is characterized in that: when cell piece is used flexible PCB to be connected, block positive and negative contact electrode is circular.
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| CN201310093132.9A CN103426940B (en) | 2013-03-22 | 2013-03-22 | A kind of staggered back contacts IBC solar battery sheet electrode structure |
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| CN201310093132.9A CN103426940B (en) | 2013-03-22 | 2013-03-22 | A kind of staggered back contacts IBC solar battery sheet electrode structure |
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| CN103426940B CN103426940B (en) | 2016-08-10 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103811565A (en) * | 2014-02-17 | 2014-05-21 | 英利能源（中国）有限公司 | Solar cell and assembly and manufacturing method thereof |
| CN103872181A (en) * | 2014-03-26 | 2014-06-18 | 苏州阿特斯阳光电力科技有限公司 | Metallization method for back contact solar battery |
| CN104362190A (en) * | 2014-10-13 | 2015-02-18 | 山东力诺太阳能电力股份有限公司 | Interdigital electrode for solar cell |
| CN105083594A (en) * | 2015-07-31 | 2015-11-25 | 上海卫星工程研究所 | Non-contact type nano-satellite-carried power supply system and method based on photoelectric sensing |
| CN105679851A (en) * | 2016-02-23 | 2016-06-15 | 深圳市创益科技发展有限公司 | Battery chips precisely machined from back contact solar cell and electrode extraction method |
| CN105742375A (en) * | 2014-12-10 | 2016-07-06 | 北京汉能创昱科技有限公司 | Back contact crystal silicon battery and preparation method thereof |
| CN106252466A (en) * | 2016-09-20 | 2016-12-21 | 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 |
| CN106876486A (en) * | 2017-03-24 | 2017-06-20 | 乐叶光伏科技有限公司 | The group string attachment structure of P-type crystal silicon back contacts double-side cell, component and method |
| CN107004730A (en) * | 2014-12-15 | 2017-08-01 | Imec 非营利协会 | Method for interconnecting back contacts photovoltaic cell |
| CN107507875A (en) * | 2017-08-14 | 2017-12-22 | 江苏科来材料科技有限公司 | A kind of back contact solar cell plate electrode is around cross structure and preparation method |
| CN109888044A (en) * | 2019-01-23 | 2019-06-14 | 茂迪太阳能科技（东莞）有限公司 | Welding method, device and battery sheet for IBC full back electrode battery sheet |
| 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 | A Simple IBC Battery Electrode Fabrication Process |
| CN114284380A (en) * | 2021-12-14 | 2022-04-05 | 苏州沃特维自动化系统有限公司 | A photovoltaic cell assembly and its connection process |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103811565A (en) * | 2014-02-17 | 2014-05-21 | 英利能源（中国）有限公司 | Solar cell and assembly and manufacturing method thereof |
| 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 |
| CN103872181A (en) * | 2014-03-26 | 2014-06-18 | 苏州阿特斯阳光电力科技有限公司 | Metallization method for back contact solar battery |
| CN104362190B (en) * | 2014-10-13 | 2016-11-16 | 山东力诺太阳能电力股份有限公司 | Interdigital electrode for solar cell |
| CN104362190A (en) * | 2014-10-13 | 2015-02-18 | 山东力诺太阳能电力股份有限公司 | Interdigital electrode for solar cell |
| 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 |
| CN105742375A (en) * | 2014-12-10 | 2016-07-06 | 北京汉能创昱科技有限公司 | Back contact 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 |
| CN107004730A (en) * | 2014-12-15 | 2017-08-01 | Imec 非营利协会 | Method for interconnecting back contacts photovoltaic cell |
| CN105083594A (en) * | 2015-07-31 | 2015-11-25 | 上海卫星工程研究所 | Non-contact type nano-satellite-carried power supply system and method based on photoelectric sensing |
| CN105679851A (en) * | 2016-02-23 | 2016-06-15 | 深圳市创益科技发展有限公司 | Battery chips precisely machined from back contact solar cell and electrode extraction method |
| CN105679851B (en) * | 2016-02-23 | 2017-07-04 | 深圳市创益科技发展有限公司 | Precision Machining back contact solar battery is into battery chip and electrode lead-out method |
| 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 |
| CN106252466A (en) * | 2016-09-20 | 2016-12-21 | 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 |
| CN106876486A (en) * | 2017-03-24 | 2017-06-20 | 乐叶光伏科技有限公司 | The group string attachment structure of P-type crystal silicon back contacts double-side cell, component and method |
| 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 |
| CN107507875A (en) * | 2017-08-14 | 2017-12-22 | 江苏科来材料科技有限公司 | A kind of back contact solar cell plate electrode is around cross structure and preparation method |
| CN107507875B (en) * | 2017-08-14 | 2024-01-26 | 江苏科来材料科技有限公司 | A back-contact solar cell electrode surrounding staggered structure and preparation method |
| CN109888044A (en) * | 2019-01-23 | 2019-06-14 | 茂迪太阳能科技（东莞）有限公司 | Welding method, device and battery sheet for IBC full back electrode battery sheet |
| 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 | A Simple IBC Battery Electrode Fabrication Process |
| CN114284380A (en) * | 2021-12-14 | 2022-04-05 | 苏州沃特维自动化系统有限公司 | A photovoltaic cell assembly and its connection process |
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