WO2011140815A1 - Solar cell, screen printing plate and solar cell module - Google Patents
Solar cell, screen printing plate and solar cell module Download PDFInfo
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- WO2011140815A1 WO2011140815A1 PCT/CN2011/000349 CN2011000349W WO2011140815A1 WO 2011140815 A1 WO2011140815 A1 WO 2011140815A1 CN 2011000349 W CN2011000349 W CN 2011000349W WO 2011140815 A1 WO2011140815 A1 WO 2011140815A1
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- Prior art keywords
- gate line
- solar cell
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- main gate
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- 238000007650 screen-printing Methods 0.000 title abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 210000000746 body region Anatomy 0.000 claims description 43
- 238000012360 testing method Methods 0.000 claims description 30
- 239000002002 slurry Substances 0.000 claims description 21
- 238000005476 soldering Methods 0.000 claims description 14
- 238000000059 patterning Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000009713 electroplating Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 229910052710 silicon Inorganic materials 0.000 abstract description 9
- 239000010703 silicon Substances 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 100
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 229910052709 silver Inorganic materials 0.000 description 9
- 239000004332 silver Substances 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000007639 printing Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 229910001128 Sn alloy Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 229910021419 crystalline silicon Inorganic materials 0.000 description 3
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- -1 Ag-Si) Chemical compound 0.000 description 1
- 229910017982 Ag—Si Inorganic materials 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to the field of photovoltaic technology, and in particular to a solar cell, and more particularly to an electrode structure of a solar cell, a screen for manufacturing the electrode, and a solar cell module including the plurality of solar cells.
- Solar cells are the basic unit of solar cell modules.
- the internal photocurrent generated by solar radiation in the body (such as crystalline silicon) needs to be collected through the electrodes of the battery and collected.
- the solar cell includes a front electrode and a back electrode, wherein the front electrode is on a face illuminated by sunlight.
- the front electrode usually includes a main gate line (or referred to as a main gate electrode) and a sub-gate line (or referred to as a sub-gate electrode, a sub-gate line) disposed on a solar cell substrate, wherein
- the gate line mainly functions to collect current
- the main gate line mainly functions to collect the current collected by the sub-gate line, and is also used as an interconnection strip when a plurality of solar cells are connected through interconnecting strips to form a solar cell module.
- the connection substrate, that is, the interconnection strip is generally connected in series by soldering or otherwise connecting to the main gate line (the main gate line of the positive electrode or the main gate line of the back electrode).
- the main problem of the promotion and application of solar power generation is that the power generation cost is much higher than that of traditional thermal power generation. Therefore, reducing the production cost of solar cells and improving the conversion efficiency of batteries have become the direction of the industry.
- the electrodes of a solar cell are usually patterned by a widely used screen printing technique, i.e., a metal paste is patterned onto a substrate of a monocrystalline silicon wafer cell on which a p-n junction has been formed, and an electrode is formed by sintering.
- a metal paste is used as a paste for screen printing to form electrodes.
- the silver paste has strong adhesion, good electrical conductivity, uniform and precise electrode surface, and weldability.
- Fig. 1 is a schematic view showing the structure of a prior art solar cell
- Fig. 2 is a schematic view showing the structure of the ⁇ - ⁇ cross section of the solar cell shown in Fig. 1.
- the bottom of the battery cell 17 of the solar cell 10 (crystalline silicon forming a p-n junction) is patterned into a main gate line 1 1 and a sub-gate line 13 , and a sub-gate line 13 is generally formed.
- the area and height of the main gate lines are also significantly larger or higher than the area and height of the sub-gate lines, respectively.
- One of the objects of the present invention is to substantially reduce the cost of the electrodes of the solar cell and to avoid the occurrence of chipping and cracking during the soldering of the front electrode and the interconnecting strip.
- a solar cell includes a battery substrate and an electrode disposed on the battery substrate, the electrode including a main gate line, wherein the main gate The line body region of the wire is configured to include at least one fine grid line to reduce the contact area of the main gate line with the substrate.
- the main gate line includes a first thin gate line and a second fine gate line respectively located at both side edges of the line body region.
- the thin gate line of the line body region of the main gate line is one, and the thin grid line is arranged as a line of a fold line type, which comprises a plurality of segments which are respectively arranged in crossover on the edges of both sides of the line body region.
- Fine grid line The line body region of the main gate line further includes at least one test point, and the thin gate line in the shape of a broken line is divided into a plurality of segments by the test point, and two ends of each of the fine gate lines are respectively associated with the test point Electrical connection.
- the two ends of each segment of the fine grid line may be electrically connected to the test point on the same side of the line body region; the two ends of each segment of the fine grid line may also be electrically connected to the test point on different sides of the line body region .
- the fine gate line has a line width of 0.1 to 0.5 mm.
- the first fine gate line and the second fine gate line are parallel to each other and the width of the line body region is 1.2 to 2 mm.
- the body region of the main gate line further includes at least one test point, and the test point is electrically connected to the fine gate line.
- test points may be configured as a rectangle or may be configured to include a plurality of lines.
- the main gate line further includes at least one head region located at a head portion of the line body region.
- the head region can be constructed in a triangular shaped tip shape.
- the line head area may be provided with a hollowed out area.
- the hollowed out region is circular and has a diameter of 50 to 400 microns.
- the width of the main gate line of the line header region is the same as the width of the main gate line of the line body region.
- the present invention provides a screen for screen-printing an electrode of the above solar cell, wherein the screen is provided with a main grid for patterning the electrode. a pattern of meshes through which the slurry passes; wherein the line body region of the main gate line is configured to include at least one fine gate line to reduce connection of the main gate line to the battery substrate Touch area.
- the main gate line includes a first thin gate line and a second fine gate line respectively located at both side edges of the line body region.
- the thin gate line of the line body region of the main gate line is one, and the thin gate line is arranged as a line of a fold line type.
- the fine gate line has a line width of 0.1 to 0.5 mm.
- the width of the body region of the main gate line is 1.2 to 2 mm.
- the screen further includes a pattern for a mesh for passing the slurry corresponding to the line head region for patterning the main gate line, wherein a plurality of regions or blocks for preventing the passage of the slurry are provided.
- the present invention provides a solar cell module, characterized in that the solar cell module includes any one of the above-mentioned solar cells, and the solar cells are connected by interconnecting strips.
- the interconnecting strip is connected to a main gate line of an electrode of the solar cell.
- the interconnect strip is bonded to the main gate line of the electrode of the solar cell by bonding or soldering, and the interconnect strip covers the entire main gate line.
- the technical effect of the present invention is that the present invention is configured to include a structure including at least one fine gate line by the line body region of the main gate line to greatly reduce the contact area between the main gate line and the substrate, and the cross-sectional area of the main gate line is also Therefore, the idea is that the contact area between the original main gate line and the substrate and the cross-sectional area of the main gate line cannot be reduced, the slurry usage amount and the coverage area of the slurry are greatly reduced, and the solar cell is lowered. the cost of.
- the recombination between the metal electrode and the silicon can be reduced, and the conversion efficiency of the battery and the module can be improved; on the other hand, after the interconnection strip is welded, the reduction can be reduced.
- the stress of the main gate line when soldering the interconnect strip (the stress is caused by the inconsistent thermal expansion and shrinkage coefficient of the main gate line of the silver electrode and the silicon of the solar cell substrate), thereby avoiding the fragmentation and hidden phenomenon caused by the soldering process. Crack phenomenon.
- the series resistance on the interconnect strip after soldering is not significantly increased, so it does not affect the conversion of the solar cell components.
- the efficiency that is, the increase in the series resistance of the main gate line, does not bring about a significant negative effect from the overall solar cell module.
- the solar cell module of the invention has the advantages of low cost, high conversion efficiency, increased output power, and high reliability.
- FIG. 1 is a schematic structural view of a prior art solar cell
- Figure 2 is a schematic view showing the structure of the A-A cross section of the solar cell shown in Figure 1;
- FIG. 3 is a schematic plan view showing a planar structure of a solar cell according to an embodiment of the present invention
- FIG. 4 is a schematic structural view of a B-B cross section of the solar cell shown in FIG.
- Figure 5 is a plan view showing the planar structure of a solar cell according to another embodiment of the present invention.
- Figure 6 is a plan view showing the planar structure of a solar cell according to still another embodiment of the present invention.
- Figure 7 is a schematic structural view of a head region of a main grid line of the solar cell shown in Figure 3 according to the present invention.
- Fig. 8 is a view showing another configuration of the head region of the main grid line of the solar cell shown in Fig. 3 according to the present invention. detailed description
- FIG. 3 is a schematic view showing the planar structure of a solar cell according to an embodiment of the present invention.
- a front electrode is formed on the side of the battery cell 17 of the solar cell 30 that is illuminated by sunlight.
- the front electrode includes a main gate line 31 and a sub-gate line 33.
- the substrate 17 is a crystalline silicon wafer in which a pn junction has been formed.
- the specific material type and specific structure of the battery substrate 17 are not limited by the present invention.
- a plurality of sub-gate lines 33 are arranged in parallel in the left-right direction and vertically intersected with the two main gate lines 31.
- the specific number of the sub-gate lines 33 and the main gate lines 31, and the arrangement of the main gate lines 31 and the sub-gate lines 33 are not limited by the embodiment of the present invention.
- Fig. 4 is a view showing the structure of the B-B section of the solar cell shown in Fig. 3. 3 and 4, the main gate line 31 includes a line body region 31a, and the main gate line 31 is constructed as a structure including a plurality of thin gate lines.
- the line body region of the main gate line 31 31a includes two thin gate lines, that is, a first thin gate line 31 1 and a second fine gate line 312 respectively disposed on both side edges of the line body region 31a, and the first thin gate line 31 1 and the second fine gate line 312 is set in parallel.
- the line width of the first fine gate line 31 1 and the second fine gate line 312 ranges from 0.1 to 0.5 mm, and the width of the line body region (the width of the line body region is the distance between the left and right edges, that is, FIG. 4 The W) shown in the range is 1.2 to 2 mm, so that the contact area between the line body region and the substrate is greatly reduced, and the blank area between the first fine gate line 31 1 and the second fine gate line 312 is The area where the silver electrode is deposited.
- a plurality of sub-gate lines 33 on the battery are in direct communication with the thin gate lines 31 1 and 312 (electrical conduction), so that the fine gate lines 311 and 312 can also achieve current collection of the sub-gate lines.
- the thin gate lines 31 1 and 312 are also used to solder the connection interconnection strips to connect the plurality of solar cells in series to form the solar cell module. It should be noted that whether the line widths of the first fine gate line 31 1 and the second fine gate line 312 are equal is not limited by the embodiment of the present invention.
- test point 315 is included in the body region of the main gate line 31, and the test point 315 is electrically connected to the main gate line 31.
- the test point 315 is disposed between the first fine gate line 311 and the second fine gate line 312.
- the test point may be a substantially rectangular shape or a test block including a plurality of thin lines having a width of 0.1 to 1 mm.
- the specific shape of the test point 315 is not limited by the embodiment of the present invention, and is only for detecting The probe provides a measurement point whose specific shape can be designed according to the shape of the detection probe.
- FIG. 5 is a schematic view showing the planar structure of a solar cell according to still another embodiment of the present invention.
- the line body region 41a of the main gate line 41 of the front surface electrode of the solar cell 40 in this embodiment is configured as a thin line type thin gate line 411, and the test point 415 is disposed on the main gate line 41.
- the line body region 41a is electrically connected to the thin gate line 41 1
- the fine gate line 41 1 includes a plurality of segments which are sequentially arranged in a line connecting the thin gate lines of the line body region 41 a to form a polygonal line structure as shown in FIG. 5 .
- the line width of the fine gate line 41 1 is substantially the same as the line width of the embodiment shown in FIG.
- the thin gate line 41 1 may have a line width ranging from 0.1 to 0.5 mm, and the plurality of sub-gate lines 43 on the battery are directly connected (electrically conducted) to the thin gate line 41 1 .
- the fine grid line 41 1 is also used to solder the connection interconnect strips to connect a plurality of solar cells in series to form a solar cell module, and when soldered, the interconnect strips are soldered to the outermost edge of the fold line.
- the solar cell 40 is more capable of reducing the contact area of the main gate line with the substrate.
- Fig. 6 is a view showing the planar structure of a solar cell according to still another embodiment of the present invention.
- the line body region 41a of the main gate line 41 of the front surface electrode of the solar cell 50 in the present embodiment is similarly configured as a thin line type 51 1 of a fold line type, the main difference being the fold line.
- the specific structure of the type of fine gate lines 511 is different.
- Each of the fine gate lines shown in FIG. 5 is connected to the test point on the same side of the line body region; and as shown in FIG. 6, the fine gate line 51 1 is composed of a plurality of segments, and each segment of the fine gate lines is connected through the test point 415.
- the width of the line body region 41a is determined by the distance between the fine grid lines of the two edges at the test point.
- the line body region of the main gate line of the solar cell of the present invention includes only a fine gate line having a very small width and a necessary test point, so that the contact area of the main gate line with the substrate is greatly reduced, that is, the slurry of the main gate line
- the printing area is also minimized, and the cross-sectional area of the main grid line is also greatly reduced, thereby maximally saving the amount of slurry used and greatly saving the slurry cost.
- the recombination between the metal and the silicon can be reduced, and the conversion efficiency of the battery and the module can be improved; on the other hand, after the interconnection strip is welded, the main reduction can be achieved.
- the stress of the gate line when soldering the interconnect strip (the stress is caused by the inconsistent thermal expansion and shrinkage coefficient of the silver gate main gate line and the solar cell substrate silicon), thereby facilitating the avoidance of fragmentation and cracking caused by the soldering process. phenomenon.
- the series resistance of the main gate line is printed relative to the previous full area.
- the series resistance of the main gate line is increased, but since one of the functions of the main gate line is used to solder the interconnect strip to form a solar cell module, generally the cross-sectional area of the interconnect strip is larger than the cross-sectional area of the main gate line. It is much larger, usually more than 10 times different; and it can be experimentally proved that the contact resistance of the interconnect strip and the main gate line (for example, soldered by lead-tin alloy) Touch) The resistance is small and has little effect on the overall resistance.
- the series resistance on the interconnect strips is not increased, therefore, It does not affect the conversion efficiency of the solar cell module, and the increase in the series resistance of the main gate line does not bring about a significant negative effect from the overall solar cell module.
- the head portion 32b of the solar cell of the main grid line 31 is also provided with a wire head region 32b.
- the main gate line is basically formed by printing and is formed by a sintering process. If the main gate line at the edge of the solar cell is also set to have the same width as the main gate line (line body region 31a) of the intermediate portion, the main body is sintered. At the gate line, the ends are very easy to warp. Therefore, the wire head region 32b is set to a triangular shape having a relatively small area to avoid warping of both end portions.
- Fig. 7 is a view showing the structure of a head region of a main grid line of the solar cell shown in Fig. 3 according to the present invention.
- the head region 31b may be further included at both ends of the body portion 31a of the main gate line 31.
- Both ends of the first fine gate line 31 1 and the second fine gate line 312 are connected to the head region 31b.
- at least one of the wire head regions is substantially triangular in shape of a pointed shape, and the wire head region is disposed to include the hollowed out region 316, thereby further reducing the use of the slurry in the wire end region, reducing the compounding, reducing the bending deformation, cracks and fragments of the battery, etc. problem.
- the hollow region 316 may include a plurality of circular holes, and the diameter of the circular holes may be 50 micrometers to 400 micrometers, which may be selected according to the specific area of the wire head region. It should be noted that the hollow region 316 is not necessarily limited to the circular hole shape of the embodiment, and may be, for example, a square hole shape, a triangular hole shape or the like.
- Fig. 8 is a view showing another configuration of the head region of the main grid line of the solar cell shown in Fig. 3 according to the present invention.
- the wire end portion 31b is also substantially a triangular pointed shape, and the triangular shaped wire end portion 31b is surrounded by the extended lines of the thin grid lines 31 1 and 312, and therefore, in this embodiment, the wire end portion
- the region 31b is configured as a triangle formed by the thin gate lines 31 1b and 312b, wherein the thin gate line 31 1b is an extension of the fine gate line 31 1 and the thin gate line 312b is an extension of the fine gate line 312.
- the line widths of the fine gate lines 31 1b and 312a may range from 0.1 to 0.5 mm.
- main gate line and the sub-gate line shown above are the shape structure of the front electrode of the solar cell, but the structural design concept of the main gate line can also be applied to the back surface electrode of the solar cell.
- a screen for screen printing an electrode for manufacturing the above solar cell there is provided a screen for screen printing an electrode for manufacturing the above solar cell.
- the electrodes of the solar cells described above are manufactured by a screen printing process, and the slurry (for example, silver paste) is transferred through the mesh on the screen to the sun.
- a substrate of the battery is used to achieve a predetermined pattern shape of the electrode. Therefore, in the screen of the invention, the shape of the mesh is matched with the shape of the electrode to be formed (especially the shape of the main grid line), and the screen is provided with a pattern for forming the main gate line described above. A pattern that allows the paddle to pass.
- the present embodiment provides a solar cell module including a plurality of the above-described solar cells, and further comprising a soldering connection to a main gate line of the plurality of solar cells. Connect the interconnects of the solar cells. Specifically, the solar cells are connected in series by interconnecting strips that are soldered or bonded or otherwise attached to the main grid of the electrodes. In conjunction with the embodiment of the solar cell shown in FIG. 3 or FIG. 5, the interconnect strips may be soldered to the fine gate lines 3 1 1 and 3 12 or soldered to the fine gate lines 41 1 to cover the entire main gate line as a whole. .
- the cross-sectional area of the interconnect strip is much larger than the cross-sectional area of the main gate line, generally more than 10 times different, and it can be experimentally proved that the contact resistance of the interconnect strip and the main gate line (for example, by lead-tin alloy soldering contact) The resistance is small and has little effect on the overall resistance. Therefore, from the overall point of view of the solar cell module, even if the series resistance of the main gate line increases, and the interconnected strips on the main gate line are connected as the main current path, the series resistance on the interconnect strip after soldering does not increase significantly.
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Abstract
A solar cell (30), a screen printing plate and a solar cell module, belong to the technical field of photovoltaic. The solar cell (30) comprises a cell substrate (17) and an electrode, wherein the electrode is arranged on the substrate (17). The electrode comprises main grid lines (31) and auxiliary grid lines (33). The main grid line (31) comprises a line area (31a) and a thrum area (31b). The construction of the line area (31a) of the main grid line (31) is in a structure comprising at least one thin grid line to reduce the contact area between the main grid line (31) and the substrate (17). The screen printing plate is used for manufacturing the electrode of the solar cell by screen printing; and meshes for composing and forming the main grid lines (31) of the electrode are arranged on the screen printing plate. The solar cell module comprises a plurality of the solar cells. The solar cell and the solar cell module have low cost, and because the compound area between the metal electrode and the silicon in the cell structure is reduced, the conversion efficiency is improved, the output power of the module is increased, and in addition, the reliability is good after an interconnector is welded with a cell plate.
Description
太阳电池、 网版及太阳电池组件 技术领域 Solar cell, screen and solar cell module
本发明属于光伏技术领域, 具体涉及太阳电池, 尤其涉及一种太 阳电池的电极结构、 用于制造该电极的网版以及包括多个该太阳电池 的太阳电池组件。 背景技术 The present invention relates to the field of photovoltaic technology, and in particular to a solar cell, and more particularly to an electrode structure of a solar cell, a screen for manufacturing the electrode, and a solar cell module including the plurality of solar cells. Background technique
鉴于常规能源供给的有限性和环保压力的增加, 目前世界上许多国 家掀起了开发利用太阳能和可再生能源的热潮, 太阳能利用技术得到了 快速的发展, 其中利用半导体的光生伏特效应将太阳能转变为电能的利 用越来越广泛。 而太阳电池就是其中最为普遍的被用来将太阳能转换为 电,能的器件。 在实际应用中, 一般是以由多个太阳电池串联而成的电池 组件作为基本的应用单元。 In view of the limited supply of conventional energy sources and the increasing pressure on environmental protection, many countries in the world have set off a boom in the development and utilization of solar energy and renewable energy. Solar energy utilization technology has been rapidly developed, using solar photovoltaic effects to convert solar energy into The use of electrical energy is becoming more widespread. Solar cells are among the most common devices used to convert solar energy into electricity and energy. In practical applications, a battery pack in which a plurality of solar cells are connected in series is generally used as a basic application unit.
太阳电池作为太阳电池组件的基本单元, 其体内 (如晶体硅) 因太 阳照射所产生的内部光生电流需要通过电池的电极进行收集并将其汇 集引出。 太阳电池包括正面电极和背面电极, 其中正面电极处于被太阳 光所照射的面。 以正面电极为例, 正面电极通常包括设置在太阳电池衬 底上的主栅线 (或称之为主栅电极) 和副栅线 (或称之为副栅电极、 次 栅线) , 其中副栅线主要起收集电流的作用, 而主栅线主要起将副栅线 收集的电流汇集的作用, 同时也在将多个太阳电池通过互连条连接形成 太阳电池组件时用作互连条的连接基体, 即一般来讲, 互连条是通过焊 接或以其他方式与主栅线 (正电极的主栅线或者背面电极的主栅线)连 接进而实现多个电池的串联。 , Solar cells are the basic unit of solar cell modules. The internal photocurrent generated by solar radiation in the body (such as crystalline silicon) needs to be collected through the electrodes of the battery and collected. The solar cell includes a front electrode and a back electrode, wherein the front electrode is on a face illuminated by sunlight. Taking a front electrode as an example, the front electrode usually includes a main gate line (or referred to as a main gate electrode) and a sub-gate line (or referred to as a sub-gate electrode, a sub-gate line) disposed on a solar cell substrate, wherein The gate line mainly functions to collect current, and the main gate line mainly functions to collect the current collected by the sub-gate line, and is also used as an interconnection strip when a plurality of solar cells are connected through interconnecting strips to form a solar cell module. The connection substrate, that is, the interconnection strip is generally connected in series by soldering or otherwise connecting to the main gate line (the main gate line of the positive electrode or the main gate line of the back electrode). ,
目前, 太阳能发电推广应用的主要问题是发电成本相比传统的火力 发电要高出许多, 所以, 降低太阳电池的生产成本, 提高电池的转换效 率成为业内努力的方向。 At present, the main problem of the promotion and application of solar power generation is that the power generation cost is much higher than that of traditional thermal power generation. Therefore, reducing the production cost of solar cells and improving the conversion efficiency of batteries have become the direction of the industry.
降低太阳电池的电极制作成本是业内降低太阳电池成本的一个努 力方向。 现有技术中, 太阳电池的电极通常通过广泛应用的丝网印刷技 术构图实现, 即, 把金属浆料构图印在已形成 p-n结的单晶硅片电池村 底上、 再通过烧结形成电极。 通常, 采用银浆作为丝网印刷形成电极的 浆料。 采用银浆具有附着力强、 导电性好、 电极表面均匀致密、 可焊性 Reducing the electrode manufacturing cost of solar cells is a direction in the industry to reduce the cost of solar cells. In the prior art, the electrodes of a solar cell are usually patterned by a widely used screen printing technique, i.e., a metal paste is patterned onto a substrate of a monocrystalline silicon wafer cell on which a p-n junction has been formed, and an electrode is formed by sintering. Usually, silver paste is used as a paste for screen printing to form electrodes. The silver paste has strong adhesion, good electrical conductivity, uniform and precise electrode surface, and weldability.
1 1
确 认 本
,好、 电池转换效率高等优点, 但是, 由于银金属的价格昂贵特性, 增加 了太阳电池的成本。 Confirmation Good, high battery conversion efficiency, etc., however, due to the expensive nature of silver metal, the cost of solar cells has increased.
图 1所示为现有技术的太阳电池的结构示意图, 图 2所示为图 1所 示太阳电池的 Α-Α截面的结构示意图。 如图 1和图 2所示, ^太阳电池 10的电池村底 17 (形成了 ρ-η结的晶体硅) 上构图形成了主栅线 1 1和 副栅线 13 , 副栅线 13—般与主栅线 1 1垂直交叉接合, 主栅线的面积和 高度也分别明显大于或高于副栅线的面积和高度。 Fig. 1 is a schematic view showing the structure of a prior art solar cell, and Fig. 2 is a schematic view showing the structure of the Α-Α cross section of the solar cell shown in Fig. 1. As shown in FIG. 1 and FIG. 2, the bottom of the battery cell 17 of the solar cell 10 (crystalline silicon forming a p-n junction) is patterned into a main gate line 1 1 and a sub-gate line 13 , and a sub-gate line 13 is generally formed. Vertically intersecting with the main gate line 1 1 , the area and height of the main gate lines are also significantly larger or higher than the area and height of the sub-gate lines, respectively.
为降低成本, 现有技术中通常考虑采用降低主栅线的线宽或者在主 栅线上设置一些不直接印刷浆料的区域来减少银浆的使用量, 但是本领 域技术人员也认识到, 虽然减小正面电极的浆料覆盖面积可以降低正面 电极的浆料使用量, 一定程度上可以节约一些成本, 但是, 在主栅线的 线宽和线高减小时, 由于串联电阻与主栅线的截面积是成反比关系, 所 以其串联电阻也必然增加, 这会导致太阳电池转换效率降低, 最终会导 致太阳电池组件的功率输出降低, 反而会得不偿失。 In order to reduce the cost, it is generally considered in the prior art to reduce the line width of the main gate line or to provide some areas on the main grid line that do not directly print the paste to reduce the amount of silver paste used, but those skilled in the art also recognize that Although reducing the slurry coverage area of the front electrode can reduce the slurry usage amount of the front electrode, some cost can be saved to some extent, but when the line width and the line height of the main gate line are reduced, the series resistance and the main gate line are The cross-sectional area is inversely proportional, so the series resistance is also inevitably increased, which leads to a decrease in solar cell conversion efficiency, which eventually leads to a decrease in the power output of the solar cell module, which may outweigh the gain.
所以在目前的一些设计中, 虽然考虑到通过在主栅线上设置一些镂 空区域来减少浆料的使用, 降低金属电极和硅 (如 Ag-Si ) 之间的复合 面积, 在一定程度上也能减少电池的弯曲 (因为金属和硅的热膨胀系数 不一样, 烧结冷却后, 就会出现电池片弯曲, 浆料使用量越多, 弯曲变 形量也会越大) ; 但是在设计时, 往往会顾虑到串联电阻的增加导致的 电池效率下降, 这些镂空区域的面积不会很大, 而且镂空区域之间内的 间隙也会很小, 这样也可以在浆料印刷后, 通过浆料自身的流动性, 覆 盖到未印刷浆料的区域, 以保证串联电阻不受到大的影响 (因为浆料的 流动、 镂空区同样被填充银浆, 主栅线的横截面积实际上并没有明显减 小) 。 所以, 在这种设计中, 电极与硅衬底的接触面积并没有减小, 所 使用的浆料量也不会有特别显著的减小。 同时, 由于银电极主栅线与太 阳电池衬底硅的热膨胀系数不一致, 综合主栅线的面积大和线高的特 点, 在后续的焊接连接互连条的工艺过程中, 会产生较大热应力, 从而 焊接过程中易产生碎片和隐裂现象。 Therefore, in some current designs, although it is considered to reduce the use of the slurry by setting some hollow areas on the main gate line, reducing the composite area between the metal electrode and silicon (such as Ag-Si), to some extent Can reduce the bending of the battery (because the thermal expansion coefficient of metal and silicon is not the same, after sintering and cooling, the battery sheet will bend, the more the amount of slurry used, the greater the amount of bending deformation); However, in design, it tends to Concerning the decrease in battery efficiency caused by the increase in series resistance, the area of these hollowed areas is not large, and the gap between the hollowed areas is also small, so that the slurry itself can be flowed after the paste is printed. Sexuality, covering the area of the unprinted paste, to ensure that the series resistance is not greatly affected (because the flow of the slurry, the hollowed out area is also filled with silver paste, the cross-sectional area of the main grid line is not significantly reduced) . Therefore, in this design, the contact area of the electrode with the silicon substrate is not reduced, and the amount of the slurry used is not particularly significantly reduced. At the same time, since the thermal expansion coefficient of the main gate line of the silver electrode and the silicon of the solar cell substrate is inconsistent, and the area of the main gate line is large and the line height is high, a large thermal stress is generated in the subsequent process of soldering the interconnect strip. Therefore, fragments and cracks are easily generated during the welding process.
有鉴于此, 有必要提出一种新型结构, 在大幅度降低太阳电池的电 极的制作成本的同时可以提高太阳电池组件的功率输出。 发明内容
本发明的目的之一是, 大幅降低太阳电池的电极的成本、 并避免 正面电极与互连条的焊接过程中易产生碎片和隐裂。 In view of this, it is necessary to propose a novel structure that can increase the power output of the solar cell module while greatly reducing the manufacturing cost of the electrode of the solar cell. Summary of the invention One of the objects of the present invention is to substantially reduce the cost of the electrodes of the solar cell and to avoid the occurrence of chipping and cracking during the soldering of the front electrode and the interconnecting strip.
本发明的又一目的是, 提高太阳电池和太阳电池组件的转换效率。 为达到本发明的目的, 根据本发明的一个方面, 提供一种太阳电 池, 包括电池衬底及设置在所述电池衬底上的电极, 所述电极包括主 栅线, 其中, 所述主栅线的线体区构造为包括至少一条细栅线的结构 以减小主栅线与村底的接触面积。 It is still another object of the present invention to improve the conversion efficiency of solar cells and solar cell modules. In order to achieve the object of the present invention, in accordance with one aspect of the present invention, a solar cell includes a battery substrate and an electrode disposed on the battery substrate, the electrode including a main gate line, wherein the main gate The line body region of the wire is configured to include at least one fine grid line to reduce the contact area of the main gate line with the substrate.
作为较佳技术方案, 所述主栅线包括分别位于线体区的两侧边沿 的第一细栅线和第二细栅线。 As a preferred technical solution, the main gate line includes a first thin gate line and a second fine gate line respectively located at both side edges of the line body region.
作为较佳技术方案, 所述主栅线的线体区的细栅线为一条, 所述 细栅线设置为呈折线型的线条, 其包括多段分别依次交叉设置于线体 区两侧边沿的细栅线。 所述主栅线的线体区还包括至少一个测试点, 所述呈折线型的细栅线被所述测试点分割成多段, 每段所述细栅线的 两端分别与所述测试点电连接。 每段所述细栅线的两端可以在线体区 的同一侧与所述测试点电连接; 每段所述细栅线的两端也可以在线体 区的不同侧与所述测试点电连接。 As a preferred technical solution, the thin gate line of the line body region of the main gate line is one, and the thin grid line is arranged as a line of a fold line type, which comprises a plurality of segments which are respectively arranged in crossover on the edges of both sides of the line body region. Fine grid line. The line body region of the main gate line further includes at least one test point, and the thin gate line in the shape of a broken line is divided into a plurality of segments by the test point, and two ends of each of the fine gate lines are respectively associated with the test point Electrical connection. The two ends of each segment of the fine grid line may be electrically connected to the test point on the same side of the line body region; the two ends of each segment of the fine grid line may also be electrically connected to the test point on different sides of the line body region .
作为优选, 所述细栅线的线宽为 0.1至 0.5毫米。 Preferably, the fine gate line has a line width of 0.1 to 0.5 mm.
作为优选, 所述第一细栅线和第二细栅线相互平行且所述线体区 的宽度为 1.2至 2毫米。 Preferably, the first fine gate line and the second fine gate line are parallel to each other and the width of the line body region is 1.2 to 2 mm.
根据本发明所提供的太阳电池的一个实施方案, 所述主栅线的线 体区还包括至少一个测试点, 所述测试点与所述细栅线电连接。 According to an embodiment of the solar cell provided by the present invention, the body region of the main gate line further includes at least one test point, and the test point is electrically connected to the fine gate line.
所述测试点可以构造为矩形, 也可以构造为包括多条线条。 The test points may be configured as a rectangle or may be configured to include a plurality of lines.
根据本发明所提供的太阳电池的一个实施方案, 所述主栅线还包 括至少一位于线体区头部的线头区。 所述线头区可以构造为类似三角 形的尖头形状。 所述线头区可以设置镂空区域。 According to an embodiment of the solar cell provided by the present invention, the main gate line further includes at least one head region located at a head portion of the line body region. The head region can be constructed in a triangular shaped tip shape. The line head area may be provided with a hollowed out area.
作为优选, 所述镂空区域为圆形, 其直径为 50至 400微米。 作为优选, 所述线头区的主栅线的宽度与所述线体区的主栅线的 宽度相同。 Preferably, the hollowed out region is circular and has a diameter of 50 to 400 microns. Preferably, the width of the main gate line of the line header region is the same as the width of the main gate line of the line body region.
按照本发明的又一方面, 本发明提供一种用于丝网印刷制造以上 所述太阳电池的电极的网版, 所述网版上设置有用于构图形成所述电 极的主栅线的、 使浆料通过的网孔的图案; 其中, 所述主栅线的线体 区构造为包括至少一条细栅线的结构以减小主栅线与电池衬底的接
触面积。 According to still another aspect of the present invention, the present invention provides a screen for screen-printing an electrode of the above solar cell, wherein the screen is provided with a main grid for patterning the electrode. a pattern of meshes through which the slurry passes; wherein the line body region of the main gate line is configured to include at least one fine gate line to reduce connection of the main gate line to the battery substrate Touch area.
作为较佳技术方案, 所述主栅线包括分别位于线体区的两侧边沿 的第一细栅线和第二细栅线。 As a preferred technical solution, the main gate line includes a first thin gate line and a second fine gate line respectively located at both side edges of the line body region.
作为较佳技术方案, 其特征在于, 所述主栅线的线体区的细栅线 为一条, 所述细栅线设置为呈折线型的线条。 As a preferred technical solution, the thin gate line of the line body region of the main gate line is one, and the thin gate line is arranged as a line of a fold line type.
作为优选, 所述细栅线的线宽为 0.1至 0.5毫米。 Preferably, the fine gate line has a line width of 0.1 to 0.5 mm.
作为优选, 所述主栅线的线体区的宽度为 1.2至 2毫米。 Preferably, the width of the body region of the main gate line is 1.2 to 2 mm.
作为较佳技术方案, 所述网版还包括用于对应于构图形成主栅线 的线头区的、 使浆料通过的网孔的图案, 其中设置有多个阻止浆料通 过的区或。 。 As a preferred technical solution, the screen further includes a pattern for a mesh for passing the slurry corresponding to the line head region for patterning the main gate line, wherein a plurality of regions or blocks for preventing the passage of the slurry are provided. .
按照本发明的再一方面, 本发明提供一种太阳电池组件, 其特征 在于, 所述太阳电池组件包括多个以上所述的任一种太阳电池, 所述 太阳电池之间通过互连条连接, 所述互连条连接于所述太阳电池的电 极的主栅线上。 According to still another aspect of the present invention, the present invention provides a solar cell module, characterized in that the solar cell module includes any one of the above-mentioned solar cells, and the solar cells are connected by interconnecting strips. The interconnecting strip is connected to a main gate line of an electrode of the solar cell.
所述互连条是通过粘结或焊接的方式与所述太阳电池的电极的 主栅线连接, 且所述互连条覆盖在整个主栅线上。 The interconnect strip is bonded to the main gate line of the electrode of the solar cell by bonding or soldering, and the interconnect strip covers the entire main gate line.
本发明的技术效果是, 本发明通过主栅线的线体区构造为包括至 少一条细栅线的结构以大幅减小主栅线与衬底的接触面积, 主栅线的 截面积也同样得以减小, 因此突破了原有主栅线与衬底的接触面积以 及主栅线的截面积不能减小的思想, 大幅度的减少了浆料使用量以及 浆料的覆盖面积, 降低了太阳电池的成本。 另外, 在浆料印刷面积大 幅减小的情况下, 一方面可以减小金属电极和硅之间的复合, 提高了 电池及组件的转换效率; 另一方面, 在互连条焊接后, 可以降低主栅 线在焊接互连条时的应力 (应力是由于银电极主栅线与太阳电池衬底 硅的热膨胀及收缩系数不一致所导致的) , 从而, 易于避免焊接过程 所产生的碎片现象和隐裂现象。 The technical effect of the present invention is that the present invention is configured to include a structure including at least one fine gate line by the line body region of the main gate line to greatly reduce the contact area between the main gate line and the substrate, and the cross-sectional area of the main gate line is also Therefore, the idea is that the contact area between the original main gate line and the substrate and the cross-sectional area of the main gate line cannot be reduced, the slurry usage amount and the coverage area of the slurry are greatly reduced, and the solar cell is lowered. the cost of. In addition, in the case where the printing area of the slurry is greatly reduced, on the one hand, the recombination between the metal electrode and the silicon can be reduced, and the conversion efficiency of the battery and the module can be improved; on the other hand, after the interconnection strip is welded, the reduction can be reduced. The stress of the main gate line when soldering the interconnect strip (the stress is caused by the inconsistent thermal expansion and shrinkage coefficient of the main gate line of the silver electrode and the silicon of the solar cell substrate), thereby avoiding the fragmentation and hidden phenomenon caused by the soldering process. Crack phenomenon.
至于由于主栅线的截面积减小引起的串联电阻的增大所导致的 电池效率降低的问题,由于主栅线的其中一个作用是用来焊接连接互连 条以形成太阳电池组件, 通常互连条的截面积要比主栅线的截面积要大 很多, 通常相差超过 10倍以上; 并且可以实验地证明, 互连条与主栅 线的接触电阻 (例如通过铅锡合金焊接接触) 电阻较小, 对整体电阻影 响很小。 因此, 从太阳电池组件的整体角度考虑, 即使主栅线的串联电
阻增加, 而主栅线上所焊接连接的互连条为组件中的主要电流通路, 焊 接连接后互连条上的串联电阻并没有明显增加, 因此, 其并不会影响太 阳电池组件的转换效率, 也即主栅线的串联电阻的增加从太阳电池组件 的整体上并未带来比较明显的负作用。 该发明的太阳电池组件具有成本 低、 转换效率高、 输出功率增大、 可靠性高的优点。 附图说明 As for the problem of reduced battery efficiency due to an increase in series resistance caused by a decrease in the cross-sectional area of the main gate line, since one of the functions of the main gate line is to solder the connection interconnection strip to form a solar cell module, usually mutual The cross-sectional area of the strips is much larger than the cross-sectional area of the main grid lines, usually more than 10 times different; and it can be experimentally proved that the contact resistance of the interconnect strips with the main gate lines (for example, by lead-tin alloy soldering) Smaller, has little effect on the overall resistance. Therefore, considering the overall perspective of the solar cell module, even the series connection of the main gate lines The resistance increases, and the interconnected strips on the main gate line are the main current paths in the assembly. The series resistance on the interconnect strip after soldering is not significantly increased, so it does not affect the conversion of the solar cell components. The efficiency, that is, the increase in the series resistance of the main gate line, does not bring about a significant negative effect from the overall solar cell module. The solar cell module of the invention has the advantages of low cost, high conversion efficiency, increased output power, and high reliability. DRAWINGS
图 1是现有技术的太阳电池的结构示意图; 1 is a schematic structural view of a prior art solar cell;
图 2所是图 1所示太阳电池的 A-A截面的结构示意图; Figure 2 is a schematic view showing the structure of the A-A cross section of the solar cell shown in Figure 1;
图 3是按照本发明实施例的太阳电池的平面结构示意图; 图 4是图 3所示太阳电池的 B-B截面的结构示意图; 3 is a schematic plan view showing a planar structure of a solar cell according to an embodiment of the present invention; FIG. 4 is a schematic structural view of a B-B cross section of the solar cell shown in FIG.
图 5 是按照本发明所提供的另一实施例的太阳电池的平面结构示 意图; Figure 5 is a plan view showing the planar structure of a solar cell according to another embodiment of the present invention;
图 6是按照本发明所提供的再一实施例的太阳电池的平面结构示 意图; Figure 6 is a plan view showing the planar structure of a solar cell according to still another embodiment of the present invention;
图 7是按照本发明图 3所示太阳电池的主栅线的线头区的结构示意 图; Figure 7 is a schematic structural view of a head region of a main grid line of the solar cell shown in Figure 3 according to the present invention;
图 8是按照本发明图 3所示太阳电池的主栅线的线头区的另一种结 构示意图。 具体实施方式 Fig. 8 is a view showing another configuration of the head region of the main grid line of the solar cell shown in Fig. 3 according to the present invention. detailed description
下面介绍的是本发明的多个可能实施例中的一些, 旨在提供对本发 明的基本了解, 并不旨在确认本发明的关键或决定性的要素或限定所要 保护的范围。 在附图中, 为了清楚起见, 有可能放大了层的厚度或者区 域的面积, 但作为示意图不应该被认为严格反映了几何尺寸的比例关 系。 附图中, 相同的标号指代相同的结构部分, 因此将省略对它们的描 述。 The following is a description of some of the various possible embodiments of the present invention, which are intended to provide a basic understanding of the invention and are not intended to identify key or critical elements of the invention. In the drawings, it is possible to magnify the thickness of a layer or the area of a region for the sake of clarity, but as a schematic diagram, it should not be considered to strictly reflect the proportional relationship of geometric dimensions. In the drawings, the same reference numerals are used to refer to the same structural parts, and the description thereof will be omitted.
本文中所提到上、 下、 左、 右、 中间、 水平等方位用语是相对于 附图中所示意的太阳电池的方位而定义的, 它们是相对的概念, 可以 根据太阳电池所使用、 放置的不同方式而相应地变化。 The terms "up, down, left, right, middle, horizontal, etc." as used herein are defined relative to the orientation of the solar cells as illustrated in the drawings. They are relative concepts and can be used according to the solar cell. The different ways vary accordingly.
图 3所示为按照本发明实施例的太阳电池的平面结构示意图。 如 图 3所示, 在太阳电池 30的电池村底 17的受太阳光照射的一面上,
形成了正面电极, 正面电极包括主栅线 31和副栅线 33 , 衬底 17为已 经形成 p-n结的晶体硅片,电池衬底 17的具体材料类型以及具体结构 不受本发明限制。 在该图 3所示实施例中, 多条副栅线 33左右方向 平行排列并与两条主栅线 31 垂直交叉接合。 副栅线 33 和主栅线 31 的具体数量、 以及主栅线 31和副栅线 33的排列方式不受本发明实施 例的限制。 3 is a schematic view showing the planar structure of a solar cell according to an embodiment of the present invention. As shown in FIG. 3, on the side of the battery cell 17 of the solar cell 30 that is illuminated by sunlight, A front electrode is formed. The front electrode includes a main gate line 31 and a sub-gate line 33. The substrate 17 is a crystalline silicon wafer in which a pn junction has been formed. The specific material type and specific structure of the battery substrate 17 are not limited by the present invention. In the embodiment shown in FIG. 3, a plurality of sub-gate lines 33 are arranged in parallel in the left-right direction and vertically intersected with the two main gate lines 31. The specific number of the sub-gate lines 33 and the main gate lines 31, and the arrangement of the main gate lines 31 and the sub-gate lines 33 are not limited by the embodiment of the present invention.
图 4所示为图 3所示的太阳电池的 B-B截面的结构示意图。 结合 图 3和图 4所示, 主栅线 31 包括线体区 31 a, 主栅线 31的构造为包 括若干条细栅线的结构, 在该实施例中, 主栅线 31 的线体区 31a 包 括两条细栅线, 即分别为设置在线体区 31a的两侧边沿的第一细栅线 31 1 以及第二细栅线 312 , 并且第一细栅线 31 1和第二细栅线 312为 平行设置。另外,第一细栅线 31 1和第二细栅线 312的线宽范围为 0.1 至 0.5毫米, 而线体区的宽度 (线体区的宽度为左右两边沿之间的距 离, 即图 4中所示的 W ) 范围为 1.2至 2毫米, 因此, 线体区与村底 的接触面积大大减小, 第一细栅线 31 1和第二细栅线 312之间的空白 区域都为未沉积银电极的区域。 电池上的多条副栅线 33 直接与细栅 线 31 1和 312连通 (电导通) , 因此, 细栅线 311和 312同样可以实 现副栅线的电流汇集。 另外在以该太阳电池 30形成太阳电池组件时, 细栅线 31 1 和 312也被用来焊接连接互连条, 以将多个太阳电池串联 连接形成太阳电池组件。 需要说明的是, 第一细栅线 31 1 和第二细栅 线 312的线宽是否相等不受本发明实施例限制。 Fig. 4 is a view showing the structure of the B-B section of the solar cell shown in Fig. 3. 3 and 4, the main gate line 31 includes a line body region 31a, and the main gate line 31 is constructed as a structure including a plurality of thin gate lines. In this embodiment, the line body region of the main gate line 31 31a includes two thin gate lines, that is, a first thin gate line 31 1 and a second fine gate line 312 respectively disposed on both side edges of the line body region 31a, and the first thin gate line 31 1 and the second fine gate line 312 is set in parallel. In addition, the line width of the first fine gate line 31 1 and the second fine gate line 312 ranges from 0.1 to 0.5 mm, and the width of the line body region (the width of the line body region is the distance between the left and right edges, that is, FIG. 4 The W) shown in the range is 1.2 to 2 mm, so that the contact area between the line body region and the substrate is greatly reduced, and the blank area between the first fine gate line 31 1 and the second fine gate line 312 is The area where the silver electrode is deposited. A plurality of sub-gate lines 33 on the battery are in direct communication with the thin gate lines 31 1 and 312 (electrical conduction), so that the fine gate lines 311 and 312 can also achieve current collection of the sub-gate lines. Further, when the solar cell module is formed by the solar cell 30, the thin gate lines 31 1 and 312 are also used to solder the connection interconnection strips to connect the plurality of solar cells in series to form the solar cell module. It should be noted that whether the line widths of the first fine gate line 31 1 and the second fine gate line 312 are equal is not limited by the embodiment of the present invention.
继续如图 3 所示, 为了方便电池测试的需要, 在主栅线 31 的线 体区还包括至少一个测试点 315 , 测试点 315与主栅线 31 电连接, 在 该实施例中, 测试点 315设置于第一细栅线 311与第二细栅线 312之 间。 其中测试点可以为大致矩形形状或者为包括多条细线的测试区 块, 所述细线的宽度为 0.1至 1毫米, 测试点 315的具体形状不受本 发明实施例限制, 其仅为检测探针提供测量点, 其具体形状可以根据 检测探针的形状而设计。 Continuing with FIG. 3, in order to facilitate the need for battery testing, at least one test point 315 is included in the body region of the main gate line 31, and the test point 315 is electrically connected to the main gate line 31. In this embodiment, the test point 315 is disposed between the first fine gate line 311 and the second fine gate line 312. The test point may be a substantially rectangular shape or a test block including a plurality of thin lines having a width of 0.1 to 1 mm. The specific shape of the test point 315 is not limited by the embodiment of the present invention, and is only for detecting The probe provides a measurement point whose specific shape can be designed according to the shape of the detection probe.
图 5所示为按照本发明所提供的又一实施例的太阳电池的平面结 构示意图。 如图 5所示, 本实施例中的太阳电池 40的正面电极的主 栅线 41的线体区 41a的构造为一条折线型设置的细栅线 41 1,测试点 415设置于主栅线 41的线体区 41a、 且与细栅线 41 1电连接, 细栅线
41 1 包括多段分别依次交叉设置于线体区 41 a的细栅线, 形成了如图 5所示的折线型结构。 细栅线 41 1的线宽与图 3所示实施例的线宽的 设置方式基本相同。 例如, 细栅线 41 1 线宽范围可以为 0.1至 0.5毫 米, 电池上的多条副栅线 43直接连通(电导通) 于细栅线 41 1。 细栅 线 41 1也被用来焊接连接互连条,以将多个太阳电池串联连接形成太阳 电池组件, 焊接时, 互连条是与折线的最外边缘焊接连接。 相比于图 3 所示实施例的太阳电池 30 , 太阳电池 40更加能够减小主栅线与衬底的 接触面积。 FIG. 5 is a schematic view showing the planar structure of a solar cell according to still another embodiment of the present invention. As shown in FIG. 5, the line body region 41a of the main gate line 41 of the front surface electrode of the solar cell 40 in this embodiment is configured as a thin line type thin gate line 411, and the test point 415 is disposed on the main gate line 41. The line body region 41a is electrically connected to the thin gate line 41 1 , and the fine gate line 41 1 includes a plurality of segments which are sequentially arranged in a line connecting the thin gate lines of the line body region 41 a to form a polygonal line structure as shown in FIG. 5 . The line width of the fine gate line 41 1 is substantially the same as the line width of the embodiment shown in FIG. For example, the thin gate line 41 1 may have a line width ranging from 0.1 to 0.5 mm, and the plurality of sub-gate lines 43 on the battery are directly connected (electrically conducted) to the thin gate line 41 1 . The fine grid line 41 1 is also used to solder the connection interconnect strips to connect a plurality of solar cells in series to form a solar cell module, and when soldered, the interconnect strips are soldered to the outermost edge of the fold line. Compared to the solar cell 30 of the embodiment shown in Fig. 3, the solar cell 40 is more capable of reducing the contact area of the main gate line with the substrate.
图 6所示为按照本发明所提供的再一实施例的太阳电池的平面结 构示意图。 对比图 5和图 6所示, 本实施例中的太阳电池 50的正面 电极的主栅线 41 的线体区 41a的同样构造为一条折线型设置的细栅 线 51 1 , 其主要差别在于折线型的细栅线 511 的具体结构有所差异。 图 5所示的每段细栅线是在线体区的同一侧连接于测试点之上; 而如 图 6所示, 细栅线 51 1 由多段组成, 每段细栅线通过测试点 415连接 在一起, 从而可以实现相互之间的电导通, 每段细栅线的两端分别在 线体区的不同侧连接于测试点之上。 因此,在该实施例中, 线体区 41 a 的宽度是以在测试点处的两边沿的细栅线之间的距离来确定。 Fig. 6 is a view showing the planar structure of a solar cell according to still another embodiment of the present invention. 5 and FIG. 6, the line body region 41a of the main gate line 41 of the front surface electrode of the solar cell 50 in the present embodiment is similarly configured as a thin line type 51 1 of a fold line type, the main difference being the fold line. The specific structure of the type of fine gate lines 511 is different. Each of the fine gate lines shown in FIG. 5 is connected to the test point on the same side of the line body region; and as shown in FIG. 6, the fine gate line 51 1 is composed of a plurality of segments, and each segment of the fine gate lines is connected through the test point 415. Together, electrical conduction between each other can be achieved, and the two ends of each segment of the fine grid line are respectively connected to the test points on different sides of the line body region. Therefore, in this embodiment, the width of the line body region 41a is determined by the distance between the fine grid lines of the two edges at the test point.
本发明的太阳电池的主栅线的线体区仅包括宽度极细的细栅线 以及必要的测试点, 使得主栅线与衬底的接触面积大大减小, 也即主 栅线的浆料印刷区域也最大限度的减小, 主栅线截面积也大大减小, 因此可最大限度的节省浆料的使用量, 大幅节约浆料成本。 The line body region of the main gate line of the solar cell of the present invention includes only a fine gate line having a very small width and a necessary test point, so that the contact area of the main gate line with the substrate is greatly reduced, that is, the slurry of the main gate line The printing area is also minimized, and the cross-sectional area of the main grid line is also greatly reduced, thereby maximally saving the amount of slurry used and greatly saving the slurry cost.
另外, 在浆料印刷面积大幅减小的情况下, 一方面可以减小金属 和硅之间的复合, 提高了电池及组件的转换效率; 另一方面, 在互连 条焊接后, 可以降低主栅线在焊接互连条时的应力 (应力是由于银电 极主栅线与太阳电池衬底硅的热膨胀及收缩系数不一致所导致的) , 从 而, 易于避免焊接过程所产生的碎片现象和隐裂现象。 In addition, in the case where the printing area of the slurry is greatly reduced, on the one hand, the recombination between the metal and the silicon can be reduced, and the conversion efficiency of the battery and the module can be improved; on the other hand, after the interconnection strip is welded, the main reduction can be achieved. The stress of the gate line when soldering the interconnect strip (the stress is caused by the inconsistent thermal expansion and shrinkage coefficient of the silver gate main gate line and the solar cell substrate silicon), thereby facilitating the avoidance of fragmentation and cracking caused by the soldering process. phenomenon.
如上所述的实施例的电池主栅线结构中, 如果仅从单一的主栅线考 虑, 由于主栅线的横截面积也大大减小, 主栅线的串联电阻相对于以前 的全面积印刷的主栅线的串联电阻是增加的, 但是, 由于主栅线的其中 一个作用是用来焊接连接互连条以形成太阳电池組件, 通常互连条的截 面积要比主栅线的截面积要大很多, 通常相差超过 10倍以上; 并且可 以实验地证明, 互连条与主栅线的接触电阻(例如通过铅锡合金焊接接
触) 电阻较小, 对整体电阻影响很小。 因此, 从太阳电池组件的整体角 度考虑, 即使主栅线的串联电阻增加, 而主栅线上所焊接连接的互连条 为主要电流通路, 互连条上的串联电阻并没有增加, 因此, 其并不会影 响太阳电池组件的转换效率, 主栅线的串联电阻的增加从太阳电池组件 的整体上并未带来比较明显的负作用。 In the battery main gate line structure of the embodiment as described above, if only the single main gate line is considered, since the cross-sectional area of the main gate line is also greatly reduced, the series resistance of the main gate line is printed relative to the previous full area. The series resistance of the main gate line is increased, but since one of the functions of the main gate line is used to solder the interconnect strip to form a solar cell module, generally the cross-sectional area of the interconnect strip is larger than the cross-sectional area of the main gate line. It is much larger, usually more than 10 times different; and it can be experimentally proved that the contact resistance of the interconnect strip and the main gate line (for example, soldered by lead-tin alloy) Touch) The resistance is small and has little effect on the overall resistance. Therefore, from the overall viewpoint of the solar cell module, even if the series resistance of the main gate line is increased, and the interconnecting strips of the soldered connection on the main gate line are the main current paths, the series resistance on the interconnect strips is not increased, therefore, It does not affect the conversion efficiency of the solar cell module, and the increase in the series resistance of the main gate line does not bring about a significant negative effect from the overall solar cell module.
继续如图 3所示, 主栅线 31 的太阳电池的边沿处的两头部分还设 置有线头区 32b。 这是由于主栅线基本都要印刷后通过烧结工艺形成, 如果太阳电池的边沿处的主栅线也设置为与中间部分的主栅线(线体区 31a ) 同样的宽度, 在烧结形成主栅线时, 两端部分非常容易翘曲。 因 此, 将线头区 32b设置为面积相对较小的三角形状, 以避免两端部分的 翘曲。 Continuing with Fig. 3, the head portion 32b of the solar cell of the main grid line 31 is also provided with a wire head region 32b. This is because the main gate line is basically formed by printing and is formed by a sintering process. If the main gate line at the edge of the solar cell is also set to have the same width as the main gate line (line body region 31a) of the intermediate portion, the main body is sintered. At the gate line, the ends are very easy to warp. Therefore, the wire head region 32b is set to a triangular shape having a relatively small area to avoid warping of both end portions.
图 7所示为按照本发明图 3所示太阳电池的主栅线的线头区的结构 示意图。 如图 7所示, 在主栅线 31 的线体区 31a的两头还可包括线头 区 31b。 第一细栅线 31 1和第二细栅线 312的两头连接于线头区 31b。 其中, 至少一个线头区大致为三角形的尖头形状, 而且线头区设置为包 括镂空区 316 , 从而可进一步减少线头区的浆料的使用, 并减少复合、 降低电池的弯曲变形、 裂紋及碎片等问题。 镂空区 316可以为包括多个 圓孔, 圓孔的孔径可以为 50微米到 400微米, 可以根据线头区的具体 面积大小选择。 需要指出的是, 镂空区 316并不一定限定为本实施例的 圆孔状, 例如还可以为方孔状、 三角形孔状等等。 Fig. 7 is a view showing the structure of a head region of a main grid line of the solar cell shown in Fig. 3 according to the present invention. As shown in Fig. 7, the head region 31b may be further included at both ends of the body portion 31a of the main gate line 31. Both ends of the first fine gate line 31 1 and the second fine gate line 312 are connected to the head region 31b. Wherein at least one of the wire head regions is substantially triangular in shape of a pointed shape, and the wire head region is disposed to include the hollowed out region 316, thereby further reducing the use of the slurry in the wire end region, reducing the compounding, reducing the bending deformation, cracks and fragments of the battery, etc. problem. The hollow region 316 may include a plurality of circular holes, and the diameter of the circular holes may be 50 micrometers to 400 micrometers, which may be selected according to the specific area of the wire head region. It should be noted that the hollow region 316 is not necessarily limited to the circular hole shape of the embodiment, and may be, for example, a square hole shape, a triangular hole shape or the like.
图 8所示为按照本发明图 3所示太阳电池的主栅线的线头区的另一 种结构示意图。 如图 8所示, 线头区 31b也同样大致为三角形的尖头形 状, 三角形状的线头区 31b是由细栅线 31 1和 312的延伸线包围而成, 因此, 在该实施例中, 线头区 31b构造为细栅线 31 1b和 312b构成的三 角形,其中细栅线 31 1b是细栅线 31 1的延伸,细栅线 312b是细栅线 312 的延伸。 细栅线 31 1b和 312a的线宽范围可以为 0.1至 0.5毫米。 Fig. 8 is a view showing another configuration of the head region of the main grid line of the solar cell shown in Fig. 3 according to the present invention. As shown in Fig. 8, the wire end portion 31b is also substantially a triangular pointed shape, and the triangular shaped wire end portion 31b is surrounded by the extended lines of the thin grid lines 31 1 and 312, and therefore, in this embodiment, the wire end portion The region 31b is configured as a triangle formed by the thin gate lines 31 1b and 312b, wherein the thin gate line 31 1b is an extension of the fine gate line 31 1 and the thin gate line 312b is an extension of the fine gate line 312. The line widths of the fine gate lines 31 1b and 312a may range from 0.1 to 0.5 mm.
需要说明的是, 以上所示的主栅线和副栅线是太阳电池的正面电 极的形状结构, 但是, 关于主栅线的结构设计思想同样可以应用于太 阳电池的背面电极。 It should be noted that the main gate line and the sub-gate line shown above are the shape structure of the front electrode of the solar cell, but the structural design concept of the main gate line can also be applied to the back surface electrode of the solar cell.
按照本发明的又一方面, 本发明提供一种用于丝网印刷制造上述 太阳电池的电极的网版。 以上所述的太阳电池的电极是通过丝网印刷 工艺制造而成, 浆料(例如银浆) 穿过通过网版上的网孔转移至太阳
电池的衬底上, 以实现电极的预定构图形状。 因此, 在该发明的网版 中网孔的形状与欲形成的电极的形状(尤其是主栅线的形状)相匹配, 网版上设置有用于构图形成以上所述及的主栅线的、 可以使桨料通过 的图案。 According to still another aspect of the present invention, there is provided a screen for screen printing an electrode for manufacturing the above solar cell. The electrodes of the solar cells described above are manufactured by a screen printing process, and the slurry (for example, silver paste) is transferred through the mesh on the screen to the sun. A substrate of the battery is used to achieve a predetermined pattern shape of the electrode. Therefore, in the screen of the invention, the shape of the mesh is matched with the shape of the electrode to be formed (especially the shape of the main grid line), and the screen is provided with a pattern for forming the main gate line described above. A pattern that allows the paddle to pass.
安照本发明的再一方面, 本实施例提供一种太阳电池组件, 其包 括多个以上所述及的太阳电池, 并且还包括焊接连接于多个太阳电池 的主栅线上的、 用于连接太阳电池的互连条。 具体地, 太阳电池之间 通过互连条串联连接, 互连条通过焊接或粘结或以其他方式连接于电 极的主栅线上。 结合图 3或图 5所示的太阳电池的实施例, 互连条可 以焊接连接于细栅线 3 1 1和 3 12或者焊接连接于细栅线 41 1之上, 从 而整体覆盖整个主栅线。 通常互连条的截面积要比主栅线的截面积要 大很多, 一般相差超过 10倍以上, 并且可以实验地证明, 互连条与主 栅线的接触电阻(例如通过铅锡合金焊接接触) 电阻较小, 对整体电阻 影响很小。 因此, 从太阳电池组件的整体角度考虑, 即使主栅线的串联 电阻增加, 而主栅线上所焊接连接的互连条为主要电流通路, 焊接后互 连条上的串联电阻并没有明显增加, 因此, 其并不会影响太阳电池组件 的转换效率, 主栅线的串联电阻的增加从太阳电池组件的整体上并未带 来比较明显的负作用。相反地, 由于主栅线与衬底的接触面积减小(浆 料印刷面积大幅减小), 太阳电池组件的成本降低、 转换效率增加并且 可靠性得以提高(易于避免烊接过程所产生的碎片现象和隐裂现象)。 According to still another aspect of the present invention, the present embodiment provides a solar cell module including a plurality of the above-described solar cells, and further comprising a soldering connection to a main gate line of the plurality of solar cells. Connect the interconnects of the solar cells. Specifically, the solar cells are connected in series by interconnecting strips that are soldered or bonded or otherwise attached to the main grid of the electrodes. In conjunction with the embodiment of the solar cell shown in FIG. 3 or FIG. 5, the interconnect strips may be soldered to the fine gate lines 3 1 1 and 3 12 or soldered to the fine gate lines 41 1 to cover the entire main gate line as a whole. . Generally, the cross-sectional area of the interconnect strip is much larger than the cross-sectional area of the main gate line, generally more than 10 times different, and it can be experimentally proved that the contact resistance of the interconnect strip and the main gate line (for example, by lead-tin alloy soldering contact) The resistance is small and has little effect on the overall resistance. Therefore, from the overall point of view of the solar cell module, even if the series resistance of the main gate line increases, and the interconnected strips on the main gate line are connected as the main current path, the series resistance on the interconnect strip after soldering does not increase significantly. Therefore, it does not affect the conversion efficiency of the solar cell module, and the increase in the series resistance of the main gate line does not bring about a relatively significant negative effect from the entirety of the solar cell module. Conversely, since the contact area of the main gate line with the substrate is reduced (the area where the paste printing area is greatly reduced), the cost of the solar cell module is lowered, the conversion efficiency is increased, and the reliability is improved (it is easy to avoid the debris generated by the splicing process). Phenomenon and cracking phenomenon).
以上例子主要以电池的正面电极为例说明本发明的太阳电池的 构造、 网版以及太阳电池组件。 尽管只对其中一些本发明的实施方式 进行了描述, 但是本领域普通技术人员应当了解, 本发明可以在不偏 离其主旨与范围内以许多其他的形式实施。 因此, 所展示的例子与实 施方式被视为示意性的而非限制性的, 在不脱离如所附各权利要求所 定义的本发明精神及范围的情况下, 本发明可能涵盖各种的修改与替 换。
The above example mainly illustrates the structure, screen and solar cell module of the solar cell of the present invention by taking the front electrode of the battery as an example. Although only a few of the embodiments of the present invention have been described, it will be understood by those skilled in the art that the present invention may be embodied in many other forms without departing from the spirit and scope of the invention. Accordingly, the present invention is to be construed as illustrative and not restrictive, and the invention may cover various modifications without departing from the spirit and scope of the invention as defined by the appended claims With replacement.
Claims
1. 一种太阳电池, 包括电池衬底及设置在所述电池衬底上的电 极, 所述电极包括主栅线, 其特征在于, 所述主栅线的线体区构造为 包括至少一条细栅线的结构以减小主栅线与衬底的接触面积。 A solar cell comprising a battery substrate and an electrode disposed on the battery substrate, the electrode comprising a main gate line, wherein the line body region of the main gate line is configured to include at least one thin The gate line is structured to reduce the contact area of the main gate line with the substrate.
2. 如权利要求 1 所述的太阳电池, 其特征在于, 所述主栅线包 括分别位于线体区的两侧边沿的第一细栅线和第二细栅线。 2. The solar cell according to claim 1, wherein the main gate line comprises a first thin gate line and a second fine gate line respectively located at both side edges of the line body region.
3. 如权利要求 1 所述的太阳电池, 其特征在于, 所述主栅线的 线体区的细栅线为一条, 所述细栅线设置为呈折线型的线条。 The solar cell according to claim 1, wherein the thin gate line of the line body region of the main gate line is one, and the fine gate line is arranged to have a line of a fold line type.
4. 如权利要求 3 所述的太阳电池, 其特征在于, 所述主栅线的 线体区还包括至少一个测试点, 所述呈折线型的细栅线被所述测试点 分割成多段, 每段所述细栅线的两端分别与所述测试点电连接。 The solar cell according to claim 3, wherein the line body region of the main gate line further comprises at least one test point, and the thin line line of the fold line type is divided into a plurality of segments by the test point. Two ends of each of the fine grid lines are electrically connected to the test points.
5. 如权利要求 4 所述的太阳电池, 其特征在于, 每段所述细栅 线的两端在线体区的同一侧与所述测试点电连接。 The solar cell according to claim 4, wherein both ends of each of the thin grid lines are electrically connected to the test point on the same side of the body region.
6. 如权利要求 4 所述的太阳电池, 其特征在于, 每段所述细栅 线的两端在线体区的不同侧与所述测试点电连接。 6. The solar cell of claim 4, wherein each of the two ends of the thin grid line is electrically connected to the test point on a different side of the body region.
7. 如权利要求 1 所述的太阳电池, 其特征在于, 所述细栅线的 线宽为 0.1至 0.5毫米。 The solar cell according to claim 1, wherein the fine gate line has a line width of 0.1 to 0.5 mm.
8. 如权利要求 2 所述的太阳电池, 其特征在于, 所述第一细栅 线和第二细栅线相互平行且所述主栅线的线体区的宽度为 1.2至 2毫 米。 The solar cell according to claim 2, wherein the first fine gate line and the second fine gate line are parallel to each other and a width of the line region of the main gate line is 1.2 to 2 mm.
9. 如权利要求 2 所述的太阳电池, 其特征在于, 所述主栅线的 线体区还包括至少一个测试点, 所述测试点与所述细栅线电连接。 9. The solar cell of claim 2, wherein the body region of the main gate line further comprises at least one test point, the test point being electrically connected to the fine gate line.
10. 如权利要求 9所述的太阳电池, 其特征在于, 所述测试点构 造为矩形。 The solar cell according to claim 9, wherein the test point is configured in a rectangular shape.
1 1. 如权利要求 9所述的太阳电池, 其特征在于, 所述测试点构 造为包括多条线条。 1 1. The solar cell of claim 9, wherein the test point is configured to include a plurality of lines.
12. 如权利要求 1所述的太阳电池, 其特征在于, 所述主栅线还 可包括至少一位于线体区头部的线头区。 12. The solar cell of claim 1, wherein the main gate line further comprises at least one head region located at a head of the line body region.
13. 如权利要求 12 所述的太阳电池, 其特征在于, 所述线头区 构造为三角形的尖头形状。 The solar cell according to claim 12, wherein the wire head region is configured in a triangular pointed shape.
14. 如权利要求 12 所述的太阳电池, 其特征在于, 所述线头区 设置镂空区域。 The solar cell according to claim 12, wherein the wire head region is provided with a hollowed out region.
15. 如权利要求 14 所述的太阳电池, 其特征在于, 所述镂空区 域为圓形, 其直径为 50至 40(H啟米。 The solar cell according to claim 14, wherein the hollow region is circular and has a diameter of 50 to 40 (H Kaimi.
16. 如权利要求 12 所述的太阳电池, 其特征在于, 所述线头区 构造为细栅线构成的三角形形状。 The solar cell according to claim 12, wherein the wire end region is configured in a triangular shape composed of a thin grid line.
17. 一种用于丝网印刷制造太阳电池的电极的网版, 其特征在于, 所述网版上设置有用于构图形成所述电极的主栅线的、 使浆料通过的 网孔的图案; 其中, 所述主栅线的线体区构造为包括至少一条细栅线 的结构以减小主栅线与衬底的接触面积。 17. A screen for electroplating an electrode for manufacturing a solar cell, characterized in that the screen is provided with a pattern for patterning a mesh of a main gate line forming the electrode through which a slurry passes. Wherein the body region of the main gate line is configured to include at least one thin gate line to reduce a contact area of the main gate line with the substrate.
18. 如权利要求 17 所述的网版, 其特征在于, 所述主栅线包括 分别位于线体区的两侧边沿的第一细栅线和第二细栅线。 18. The screen according to claim 17, wherein the main gate line comprises a first thin gate line and a second fine gate line respectively located at both side edges of the line body region.
19. 如权利要求 17 所述的网版, 其特征在于, 所述主栅线的线 体区的细栅线为一条, 所述细栅线设置为呈折线型的线条。 19. The screen according to claim 17, wherein the thin gate line of the body region of the main gate line is one, and the fine grid line is disposed as a line of a fold line type.
20. 如权利要求 17 所述的网版, 其特征在于, 所述细栅线的线 宽为 0.1至 0.5毫米。 The screen according to claim 17, wherein the fine grid line has a line width of 0.1 to 0.5 mm.
21. 如权利要求 17 所述的网版, 其特征在于, 还包括用于对应 于构图形成主栅线的线头区的、 使浆料通过的网孔的图案, 其中设置 有多个阻止浆料通过的区域。 21. The screen according to claim 17, further comprising a pattern for passing a mesh through which the slurry passes to form a head region of the main gate line, wherein a plurality of blocking pastes are disposed The area passed.
22. 一种太阳电池组件, 其特征在于, 所述太阳电池组件包括多 个如权利要求 1所述的太阳电池, 所述太阳电池之间通过互连条连接, A solar cell module, characterized in that the solar cell module comprises a plurality of solar cells according to claim 1, wherein the solar cells are connected by interconnecting strips,
23. 如权利要求 22 所述的太阳电池组件, 其特征在于, 所述互 连条是通过粘结或焊接的方式与所述太阳电池的电极的主栅线连接, 且所述互连条覆盖在整个主栅线上。 The solar cell module according to claim 22, wherein the interconnecting strip is connected to a main gate line of an electrode of the solar cell by bonding or soldering, and the interconnecting strip covers On the entire main grid line.
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CN101826569A (en) * | 2010-05-13 | 2010-09-08 | 无锡尚德太阳能电力有限公司 | Solar cell, screen printing plate and solar cell module thereof |
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