CN110931586A - Solder strip and flexible solar cell module - Google Patents
Solder strip and flexible solar cell module Download PDFInfo
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- CN110931586A CN110931586A CN201810993222.6A CN201810993222A CN110931586A CN 110931586 A CN110931586 A CN 110931586A CN 201810993222 A CN201810993222 A CN 201810993222A CN 110931586 A CN110931586 A CN 110931586A
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- 229910000679 solder Inorganic materials 0.000 title claims abstract description 81
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 229920006280 packaging film Polymers 0.000 claims abstract description 12
- 239000012785 packaging film Substances 0.000 claims abstract description 12
- 238000009459 flexible packaging Methods 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- 239000008393 encapsulating agent Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 13
- 230000000052 comparative effect Effects 0.000 description 22
- 239000010408 film Substances 0.000 description 19
- 238000000034 method Methods 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 239000013078 crystal Substances 0.000 description 12
- 238000010030 laminating Methods 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 229910021419 crystalline silicon Inorganic materials 0.000 description 7
- 229910021417 amorphous silicon Inorganic materials 0.000 description 6
- 238000005476 soldering Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 238000005538 encapsulation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- 238000003848 UV Light-Curing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 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
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
-
- 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
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- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention relates to a solder strip and a flexible solar cell module. The welding strip comprises a first extension portion, a stretching portion and a second extension portion, the stretching portion is of a curve section-shaped structure, one end of the stretching portion is connected to the first extension portion, the other end of the stretching portion is connected to the second extension portion, the first extension portion and the second extension portion are collinear, a connection point of the stretching portion and the first extension portion is used as a coordinate origin, and a curve section is a sine curve section of at least one complete cycle. The flexible solar cell module comprises a flexible substrate, a plurality of solar cells and a flexible packaging film, wherein the solar cells are arranged between the flexible substrate and the flexible packaging film, the plurality of solar cells are connected in series through the welding strips, the first extending parts and the second extending parts of the welding strips are connected to the electrodes of the two adjacent solar cells, and the positive electrode and the negative electrode of the electrodes of the two adjacent solar cells are different. The flexible solar cell module adopting the welding strip realizes the large deformation effects of the module such as extending and folding.
Description
Technical Field
The invention relates to the field of solar cells, in particular to a solder strip and a flexible solar cell module.
Background
The traditional hard crystalline silicon solar cell is dominant in the photovoltaic market by virtue of high efficiency, stability and low price, and is a conventional power source in the form of a large power station, so that the hard crystalline silicon solar cell is widely applied to the fields of large power stations, distributed photovoltaic power stations and the like. However, conventional solar cell modules are generally rigid structures, and generally employ a transparent film of PET (about 200 μm thick), an EVA layer (about 500 μm thick), a monocrystalline or polycrystalline silicon wafer (about 180 μm thick), and a back-light TPE plate, and the surface density thereof is usually 2.0-2.5 kg/m2Resulting in a lack of flexibility of the solar cell module.
In order to make the solar cell module flexible, the conventional technology is to thin the solar cell material to below 50 μm or to directly grow a thin film type solar cell on a flexible substrate. However, the solar cell material is generally an inorganic material, and has no ductility, and cannot be deformed greatly, so that the application of the solar cell material in the fields of wearable and the like is still limited. In addition, the traditional flexible solar cell module is mainly packaged by adopting a flexible front film, packaging glue, a flexible supporting material and the like to realize the flexibility of the solar cell module, the problems of hidden cracks in the solar cell and the like exist in the deformation process, the stability of the solar cell is greatly influenced, and the efficiency is reduced or even the module fails.
Disclosure of Invention
Based on this, it is necessary to provide a solder strip and a flexible solar cell module aiming at the problems of extensibility, stability and the like of the solar cell module, wherein the solder strip has better deformation capability in each direction, and when the solder strip is applied to the flexible solar cell module, the extensible and foldable deformation effects of the module can be realized, and the stability of the solar cell module in the deformation process can be improved.
A solder strip comprising a first extension portion, a stretching portion and a second extension portion, wherein the stretching portion is a curved segment-shaped structure, one end of the stretching portion is connected to the first extension portion, the other end of the stretching portion is connected to the second extension portion, the first extension portion and the second extension portion are collinear, the point of connection of the stretching portion and the first extension portion is taken as a coordinate origin, and the curved segment is a sinusoidal segment of at least one complete cycle.
In one embodiment, the amplitude of the sinusoidal segment is A, the wavelength is lambda, and A is 1:5 to 3: 1.
In one embodiment, the period number of the sinusoidal segment is K, the K is an integral multiple of 0.5, and K is more than or equal to 1.
In one embodiment, the width of the stretching part is d1The width of the first extension part and the second extension part are both d2，d1:d2＝1:1～1:5。
In one embodiment, the solder strip is a unitary structure.
The welding strip is centrosymmetric or axisymmetric and can extend in any direction in the same plane. In addition, in the stretching process, the stress distribution is uniform, the stretching deformation degree is high, the stretching performance in all directions has no great difference, and the elastic recovery performance is good. Therefore, the welding strip has good deformation capability, can be widely applied to the fields of flexible products and the like, and realizes the functions of deformation and extensibility of the products.
The utility model provides a flexible solar cell module, includes flexible base plate, a plurality of solar cell, flexible encapsulating film, solar cell set up in the flexible base plate with between the flexible encapsulating film, it is a plurality of weld through the aforesaid between the solar cell and take series connection, weld the first extension and the second extension in area and connect on two adjacent solar cell's electrode, the positive negative pole of two adjacent solar cell's electrode is different.
In one embodiment, the electrodes of the solar cell are located on the surface of the solar cell facing the flexible substrate.
In one embodiment, the first extension and the second extension are both connected to the electrode in a covering manner.
In one embodiment, the first extension and the second extension both completely cover the electrode.
In one embodiment, the solder strips are independent of each other.
In one embodiment, the solder strip is a tin-plated copper strip.
In one embodiment, the thickness of the solar cell is 2-200 μm.
In one embodiment, the short-circuit currents of two adjacent solar cells differ by less than or equal to 2%.
In one embodiment, the solar cell comprises at least one of a crystalline silicon solar cell, an amorphous silicon solar cell, a GaAs solar cell, a CIGS solar cell, a CZTS solar cell, a perovskite solar cell, an organic solar cell, a dye-sensitized solar cell.
In one embodiment, the thickness of the flexible packaging film is 0.02 mm-2 mm.
In one embodiment, the flexible encapsulation film comprises one of a UV light curable adhesive, a PVB film, a PVC film, a PET film, an EVA film, or an ETFE film.
In one embodiment, the thickness of the flexible substrate is 0.2mm to 5 mm.
In one embodiment, the flexible substrate comprises one of a PI substrate and a carbon fiber plate.
The flexible solar cell module has the following beneficial effects:
in the flexible solar cell module, the plurality of solar cells are connected into a circuit through the welding strips, so that gaps among the cells can be reduced to ensure the proportion of the area of the cells in the module, the module can have extensible performance when being stretched and deformed, the defect that the cells are partially inextensible is overcome, the flexible solar cell module can be folded in a specific direction, the extensible and foldable deformation effects of the flexible solar cell module are realized, the stability of the cells in the deformation process of the flexible solar cell module is improved, the application scenes of the flexible solar cell module are wider, and convenience is brought to the subsequent portability of flexible wearable equipment, flexible electronic products and the like.
In the flexible solar cell module, solar cells made of any material can be used, and the flexible solar cell module with different areas can be molded by the arrangement design of the solar cells and the distribution of the solder strips.
The flexible solar cell module has the characteristics of light weight, extensibility, foldability and the like, can be used as a flexible mobile power supply, and is expected to improve the photoelectric conversion efficiency by times, so that the flexible solar cell module has a very important application prospect in the fields of high-end mobile electronic products, Internet of things, stratospheric airships, unmanned planes, mobile communication and the like.
Drawings
FIG. 1 is a schematic structural view of one embodiment of a solder strip in accordance with the present invention;
FIG. 2 is a schematic diagram illustrating a deformation structure of the solder strip of FIG. 1 under a transverse tensile force;
FIG. 3 is a schematic diagram illustrating a deformation structure of the solder strip of FIG. 1 under a longitudinal tensile force;
FIG. 4 is a schematic structural view of another embodiment of a solder strip of the present invention;
FIG. 5 is a schematic structural view of yet another embodiment of a solder strip of the present invention;
FIG. 6 is a schematic structural view of a solder strip of comparative example 1;
FIG. 7 is a schematic structural view of a solder strip of comparative example 2;
fig. 8 is a schematic plan view of an embodiment of a flexible solar cell module according to the present invention;
fig. 9 is a schematic structural diagram of a solar cell according to the present invention.
In the figure, 1, solder strip; 2. a solar cell; 3. a flexible encapsulation film; 4. a flexible substrate; 11. a first extension portion; 12. a second extension portion; 13. a stretching section; 21. a p-type region; 22. an n-type region; 23. an electrode; 51. a third extension portion; 52. a fourth extension portion; 53. a second stretching section.
Detailed Description
The solder strip and the flexible solar cell module provided by the invention are further explained in the following description with reference to the accompanying drawings.
As shown in fig. 1, a solder strip 1 according to an embodiment of the present invention mainly serves for connection. In this embodiment, the solder strip 1 is a solder material used for a solar cell module, and is mainly used for connection between cells, and plays an important role in conducting and collecting electricity.
The welding strip 1 comprises a first extension part 11, a stretching part 13 and a second extension part 12, wherein the stretching part 13 is a curve segment-shaped structure, one end of the stretching part 13 is connected to the first extension part 11, the other end of the stretching part 13 is connected to the second extension part 12, the first extension part 11 and the second extension part 12 are collinear, the connection point of the stretching part 13 and the first extension part 11 is taken as a coordinate origin, and the curve segment is a sine curve segment of at least one complete cycle.
Specifically, the periodicity of the sinusoidal segment is K, the K is an integral multiple of 0.5, and the K is more than or equal to 1. In the present embodiment, it is considered that K is too large, and the spacing between the solar cells is large after stretching, which results in a decrease in the total number of solar cells in a module having the same area, and further results in a decrease in the light receiving area of the flexible solar cell module. Therefore, in order to ensure the light receiving area of the solar cell module, the period number K of the sinusoidal segment is 1 in the present embodiment.
It is considered that when the solder strip is centrosymmetric, it has a good effect on the longitudinal restoring force and does not exhibit an arch-shaped overall deformation. Preferably, the periodicity K of the sinusoidal segment is an integral multiple of 1, so that the solder strip is in a centrosymmetric structure.
Specifically, the amplitude of the sinusoidal segment is a, and the wavelength is λ. A.lambda.values which are too small lead to sinusoidal sections of the solder strip 1 which approach a straight line and therefore the ductile behavior is impaired. An excessive value of a: λ may cause the tip of the sinusoidal segment of the solder strip 1 to appear sharp and protruding, be difficult to machine, and may reduce the restorability of the solder strip 1. Therefore, a λ is preferably 1:5 to 3: 1.
The width of the stretching part 13 is d1The widths of the first extension part 11 and the second extension part 12 are both d2. D is2Depending on the width of the solar cell electrode, when d2When the solar cell electrode is completely covered, a better contact effect can be obtained. And the stretching part is used for realizing the extensibility of the assembly, if the stretching part is too thin, stress concentration can be caused on the connecting point part of the stretching part and the first extending part and the second extending part, and the welding strip is easy to damage due to crack propagation. Therefore, d is preferred1:d2＝1:1～1:5。
Specifically, the welding strip 1 is of an integral structure, is manufactured through die casting or direct rolling and the like, and is treated in advance to remove internal stress.
The schematic deformation structure of the solder strip 1 under the action of the transverse stretching force can be seen in fig. 2, and the schematic deformation structure under the action of the longitudinal stretching force can be seen in fig. 3. As can be seen from fig. 2 and 3, the solder strip 1 of the present embodiment has a high degree of tensile deformation, no difference in tensile properties in each direction, and a good deformability.
It is understood that in other embodiments, the number K of periods of the sinusoidal curve may be varied in any suitable way according to the actual application requirements. However, in order to ensure that the first extension 11 and the second extension 12 are collinear, the solder strip 1 is in a centrosymmetric or axisymmetric structure, the period number K is an integral multiple of 0.5, and K is more than or equal to 1. With the increase of the periodicity of the sine curve, the solder strip 1 can provide a longer deformation distance during stretching, so that the deformation effect of the solar cell module is better, and the method is suitable for application fields with higher requirements on flexibility. And as the requirement for flexibility increases, the number of periods K of the sinusoid increases accordingly.
In the embodiment shown in fig. 4, the period number K of the sinusoidal curve is 1.5, and the solder ribbon has an axisymmetric structure.
In the embodiment shown in fig. 5, the period number K of the sinusoidal curve is 2, and the solder ribbon has a central symmetrical structure.
The welding strip is centrosymmetric or axisymmetric and can extend in any direction in the same plane. In addition, in the stretching process, the stress distribution is uniform, the stretching deformation degree is high, the stretching performance in all directions has no great difference, and the elastic recovery performance is good. Therefore, the welding strip has good deformation capability, can be widely applied to the fields of flexible products and the like, and realizes the functions of deformation and extensibility of the products.
Fig. 8 is a schematic structural diagram of an exemplary flexible solar cell module formed by connecting solder strips according to the present invention, in which the flexible solar cell module includes a flexible substrate 4, a plurality of solar cells 2, and a flexible encapsulation film 3, the solar cells 2 are disposed between the flexible substrate 4 and the flexible encapsulation film 3, the plurality of solar cells 2 are connected in series by using the solder strips 1, the first extension portions 11 and the second extension portions 12 of the solder strips 1 are connected to electrodes 23 of two adjacent solar cells 2, and the electrodes 23 of the two adjacent solar cells 2 have different positive and negative polarities.
As shown in fig. 9, the p-type region 21 and the n-type region 22 of the solar cell 2 are disposed facing the flexible substrate 4, and the electrodes 23 are disposed on the surfaces of the p-type region 21 and the n-type region 22 facing the flexible substrate 4, so that the back contact structure can prevent the solder strip 1 from blocking incident light when being soldered to the electrodes 23, thereby ensuring the light receiving area of the solar cell 2.
Specifically, the first extension 11 and the second extension 12 are connected to the electrode 23 by welding, and both the first extension 11 and the second extension 12 are connected to the electrode 23 in a covering manner.
Preferably, the first extension 11 and the second extension 12 both completely cover the electrode 23, and the width of the first extension 11 and the second extension 12 is equal to or greater than the width of the electrode 23. On the one hand, the conductivity of the solar cells 2 connected in series can be improved, on the other hand, the solar cells 2 can be better fixed, the local stress concentration in the deformation process is avoided, the deformation can effectively achieve the extension effect through the stretching part 13 of the welding strip 1, and the reliability of the whole solar cell module is improved.
Specifically, the solar cells 2 are connected in series, and the positive electrodes and the negative electrodes of two adjacent solar cells 2 are required to be connected in series. It can be understood that when the welding strips 1 are adopted for series connection, the welding strips 1 are mutually independent, so that the connection of the anode and the cathode of the solar battery is ensured to be correct, the phenomenon of short circuit can not occur, and the output voltage of the solar battery assembly is ensured to reach a higher value.
Specifically, the solder ribbon 1 is connected between the solar cells 2, and plays an important role in conducting and collecting electricity. The properties of the solder strip 1, such as conductivity and ductility, directly affect the stretching and stretching effect of the solar cell module and the current collection efficiency of the solar cell module.
Specifically, the solder strip 1 comprises one of a tinned copper strip and a tin-lead solder strip, and preferably the tinned copper strip.
Specifically, since the solar cells 2 are connected in series by the solder ribbons 1, the thickness of the solar cells 2 is not limited to 50 μm or less, and the solar cells 2 having a thickness of 2 μm to 200 μm can be used, which results in a wider selection range.
Specifically, in order to avoid the short-plate effect, the difference between the short-circuit currents of two adjacent solar cells 2 is less than or equal to 2%.
Preferably, the solar cell 2 includes at least one of a crystalline silicon solar cell, an amorphous silicon solar cell, a GaAs solar cell, a CIGS solar cell, a CZTS solar cell, a perovskite solar cell, an organic solar cell, and a dye-sensitized solar cell, which is not limited by the material of the solar cell 2.
In view of the fact that the same type of solar cell 2 is superior in electrical performance and aesthetic appearance, it is preferable that the plurality of solar cells 2 in the flexible solar cell module are of the same type.
Preferably, the area of the solar cell 2 can be selected according to actual needs, so that the flexible solar cell module with different area sizes can be formed.
Specifically, the thickness of the flexible packaging film 3 is 0.02 mm-2 mm, and the selection range is wide.
Preferably, the flexible encapsulation film 3 includes one of a UV light curing adhesive, a PVB film, a PVC film, a PET film, an EVA film, or an ETFE film.
Specifically, the thickness of the flexible substrate 4 is 0.2mm to 5mm, and the selection range is wide.
Preferably, the flexible substrate 4 includes one of a PI substrate and a carbon fiber plate.
In the flexible solar cell module, the plurality of solar cells are connected into a circuit through the welding strips, so that gaps among the cells can be reduced to ensure the proportion of the area of the cells in the module, the module can have extensible performance when being stretched and deformed, the defect that the cells are partially inextensible is overcome, the flexible solar cell module can be folded in a specific direction, the extensible and foldable deformation effects of the flexible solar cell module are realized, the stability of the cells in the deformation process of the flexible solar cell module is improved, the application scenes of the flexible solar cell module are wider, and convenience is brought to the subsequent portability of flexible wearable equipment, flexible electronic products and the like. For example, the solar cell clothes can be deformed in a proper amount according to the action of a person, and the defects that a conventional component or a flexible solar cell can only be bent but cannot be extended and has poor stretching capacity are overcome.
In the flexible solar cell module, solar cells made of any material can be used, and the flexible solar cell module with different areas can be molded by the arrangement design of the solar cells and the distribution of the solder strips.
The flexible solar cell module has the characteristics of light weight, extensibility, foldability and the like, can be used as a flexible mobile power supply, and is expected to improve the photoelectric conversion efficiency by times, so that the flexible solar cell module has a very important application prospect in the fields of high-end mobile electronic products, Internet of things, stratospheric airships, unmanned planes, mobile communication and the like.
Hereinafter, the solder ribbon and the flexible solar cell module will be further described by the following specific examples.
Example 1:
the solder ribbon 1 of this embodiment includes a first extension portion 11, a stretching portion 13, and a second extension portion 12 that are integrally formed. Stretching portion 13 is a curved segment-shaped structure, one end of stretching portion 13 is connected to first extending portion 11, the other end of stretching portion 13 is connected to second extending portion 12, and first extending portion 11 and second extending portion 12 are collinear. The curve is a sine curve of at least one complete cycle with the point of connection of the stretching portion 13 and the first extension portion 11 as the origin of coordinates, and the cycle number K of the sine curve is 1. The amplitude of the sinusoid is a, the wavelength is λ, and a: λ is 1: 5. The width of the stretching part 13 is d1The width of the first extension part 11 and the second extension part 12 are both d2，d1:d2＝1:1。
Example 2:
this example differs from example 1 only in that a:λis 2: 5.
Example 3:
this example differs from example 1 only in that a ═ 1: 1.
Example 4:
this example differs from example 1 only in that a:λis 8: 5.
Example 5:
this example differs from example 1 only in that a ═ 2: 1.
Example 6:
this example differs from example 1 only in that a ═ 3: 1.
Example 7:
this example differs from example 1 only in that d1:d2＝1:3。
Example 8:
this example differs from example 1 only in that d1:d2＝1:5。
Example 9:
this example differs from example 1 only in that K is 1.5.
Example 10:
this example differs from example 1 only in that K ═ 2.
Comparative example 1:
as shown in fig. 6, comparative example 1 differs from example 1 only in that the cycle number K is 0.5. Comparative example 2:
comparative example 2 differs from example 1 only in that a:λis 1: 6.
Comparative example 3:
comparative example 3 differs from example 1 only in that a ═ 4: 1.
Comparative example 4:
as shown in fig. 7, the curve of comparative example 4 is formed by splicing two nearly "U" shaped structures at one end. In comparative example 4, the depth of the "U" shaped structure was h, the opening width was L/2, and the curve segment structure h: and L is 1: 5.
Comparative example 5:
this comparative example differs from comparative example 4 only in that h: l is 1: 1.
Comparative example 6:
this comparative example differs from comparative example 4 only in that h: and L is 3: 1.
Tensile tests were carried out on the solder strips of examples 1 to 10 and comparative examples 1 to 6, and the results were as follows:
in the stretching process of the solder strips of examples 1 to 10, the stress distribution is uniform, the degree of stretching deformation is high, the stretching performance in each direction has no great difference, and the elastic recovery performance is good. Moreover, the solder ribbons of examples 1 to 8 and 10 maintained good performance after repeated stretching for a plurality of times, and only example 9 exhibited a dome-like deformation due to the longitudinal restoring force after repeated stretching for a plurality of times.
The solder ribbon K of comparative example 1 was 0.5, and the recovery ability after deformation was poor. And because the welding strip is of a non-centrosymmetric structure, the welding strip is in arch-shaped integral deformation under the action of longitudinal restoring force in the linear stretching process.
The solder ribbon elongation of comparative example 2 was low.
The solder strip of comparative example 3 was subjected to stress concentration induced damage at the tip of the sinusoidal segment in repeated tensile tests.
The stretching effects of comparative examples 4, 5, and 6 were similar to those of examples 1 to 10, but fatigue failure occurred at the connection point portion of the third extending portion 51 and the second stretching portion 52, and the connection point of the fourth extending portion 52 and the second stretching portion 53 in the repeated stretching experiments.
Example 11:
(1) an ultrathin crystalline silicon solar cell is selected, and the thickness of the ultrathin crystalline silicon solar cell is 30 micrometers. The back contact structure is designed, so that the electrodes are concentrated on the back surface.
(2) 3 multiplied by 3 ultrathin crystal silicon solar cells are connected in series by adopting the solder strips of the embodiment 1 by adopting a soldering method, the solder strips are tinned copper strips, the solder strips completely cover the electrodes, and the difference between the short-circuit currents of two adjacent ultrathin crystal silicon solar cells is less than or equal to 2%. And lead out by a lead to form the solar cell circuit.
(3) And laminating the EVA packaging film with the thickness of 0.5mm, the ultrathin crystalline silicon solar cell and the PI substrate with the thickness of 2mm in sequence from top to bottom, and laminating to obtain the flexible solar cell module.
Example 12:
(1) an ultrathin crystal silicon solar cell is selected, and the thickness of the ultrathin crystal silicon solar cell is 20 micrometers. The back contact structure is designed, so that the electrodes are concentrated on the back surface.
(2) 2 multiplied by 2 ultrathin crystal silicon solar cells are connected in series by adopting the solder strips of the embodiment 1 by adopting a soldering method, the solder strips are tinned copper strips, the solder strips completely cover the electrodes, and the difference between the short-circuit currents of two adjacent ultrathin crystal silicon solar cells is less than or equal to 2%. And lead out by a lead to form the solar cell circuit.
(3) And (3) laminating the PVB packaging film with the thickness of 0.8mm, the ultrathin crystal silicon solar cell and the PI substrate with the thickness of 4mm in sequence from top to bottom, and laminating to obtain the flexible solar cell module.
Example 13:
(1) an ultrathin crystal silicon solar cell is selected, and the thickness of the ultrathin crystal silicon solar cell is 50 micrometers. The back contact structure is designed, so that the electrodes are concentrated on the back surface.
(2) 4 multiplied by 4 ultrathin crystal silicon solar cells are connected in series by adopting the solder strips of the embodiment 1 by adopting a soldering method, the solder strips are tinned copper strips, the solder strips completely cover the electrodes, and the difference between the short-circuit currents of two adjacent ultrathin crystal silicon solar cells is less than or equal to 2%. And lead out by a lead to form the solar cell circuit.
(3) And (3) laminating the PET packaging film with the thickness of 1mm, the ultrathin crystal silicon solar cell and the carbon fiber substrate with the thickness of 1mm in sequence from top to bottom, and laminating to obtain the flexible solar cell module.
Example 14:
(1) selecting a CIGS solar cell with the thickness of 5 mu m, wherein the substrate is a stainless steel substrate;
(2) the 9 x 9 CIGS solar cells are connected in series by adopting the solder strip of the embodiment 1 by adopting a soldering method, the solder strip is a tinned copper strip, the solder strip completely covers the electrode, and the difference of the short-circuit current of the two adjacent CIGS solar cells is less than or equal to 2%. And lead out by a lead to form the solar cell circuit.
(3) And (3) sequentially laminating an ETFE packaging film with the thickness of 0.2mm, a CIGS solar cell and a PI substrate with the thickness of 2mm from top to bottom, and laminating to obtain the flexible solar cell module.
Example 15:
(1) selecting a perovskite solar cell with the thickness of 2 mu m, wherein the substrate is a stainless steel substrate;
(2) 8 multiplied by 4 perovskite solar cells are connected in series by adopting the solder strip of the embodiment 1 by adopting a soldering method, the solder strip is a tinned copper strip, the solder strip completely covers the electrode, and the difference of the short-circuit current of two adjacent perovskite solar cells is less than or equal to 2%. And lead out by a lead to form the solar cell circuit.
(3) And (3) laminating the UV light-curing adhesive packaging film with the thickness of 0.5mm, the perovskite solar cell and the carbon fiber substrate with the thickness of 2mm in sequence from top to bottom, and laminating to obtain the flexible solar cell module.
Example 16:
(1) selecting an amorphous silicon solar cell with the thickness of 15 mu m, wherein the substrate is a stainless steel substrate;
(2) the 18 x 12 amorphous silicon solar cells are connected in series by adopting the solder strips of the embodiment 1 by adopting a soldering method, the solder strips are tinned copper strips, the solder strips completely cover the electrodes, and the difference between the short-circuit currents of the two adjacent amorphous silicon solar cells is less than or equal to 2%. And lead out by a lead to form the solar cell circuit.
(3) And (3) laminating the PVC packaging film with the thickness of 0.6mm, the amorphous silicon solar cell and the PI substrate with the thickness of 5mm in sequence from top to bottom, and laminating to obtain the flexible solar cell module.
Example 17:
the difference between this example and example 11 is that the thickness of the selected solar cell is 200 μm, the planar extensibility is the same as that of example 1, but the coating effect of the curved surface structure is poor.
Example 18:
this example differs from example 11 only in that the flexible encapsulating film selected was 0.02 mm.
Example 19:
this example differs from example 11 only in that the flexible encapsulating film chosen was 2 mm.
Example 20:
this example differs from example 11 only in that the substrate selected was a 5mm PI substrate.
The flexible solar cell module obtained in the embodiments 11 to 20 has light weight, has extensible and foldable deformation effects, has good stability in the deformation process, and can be applied to the fields of flexible wearable equipment, flexible electronic products, high-end mobile electronic products, internet of things, stratospheric airships, unmanned aerial vehicles, mobile communication and the like.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (16)
1. A solder strip comprising a first extension portion, a stretching portion and a second extension portion, wherein the stretching portion is a curved segment structure, one end of the stretching portion is connected to the first extension portion, the other end of the stretching portion is connected to the second extension portion, the first extension portion and the second extension portion are collinear, the point of connection of the stretching portion and the first extension portion is the origin of coordinates, and the curved segment is at least one complete cycle of a sinusoidal segment.
2. The solder strip of claim 1, wherein the sinusoidal segment has an amplitude A and a wavelength λ, and A λ is 1:5 to 3: 1.
3. The solder strip of claim 1, wherein the number of periods of the sinusoidal segment is K, wherein K is an integer multiple of 0.5, and K ≧ 1.
4. Solder strip according to claim 1, characterized in that the width of the stretch is d1The width of the first extension part and the second extension part are both d2，d1:d2＝1:1～1:5。
5. The solder strip of claim 1, wherein the solder strip is a unitary structure.
6. A flexible solar cell module, comprising a flexible substrate, a plurality of solar cells, and a flexible packaging film, wherein the solar cells are disposed between the flexible substrate and the flexible packaging film, the plurality of solar cells are connected in series by the solder strip according to any one of claims 1 to 5, the first extension portion and the second extension portion of the solder strip are connected to the electrodes of two adjacent solar cells, and the electrodes of two adjacent solar cells have different polarities.
7. The flexible solar cell module of claim 6 wherein the electrodes of the solar cells are located on the surface of the solar cells facing the flexible substrate.
8. The flexible solar cell assembly of claim 7 wherein the first extension and the second extension are each coveringly attached to the electrode.
9. The flexible solar cell assembly of claim 8 wherein the first extension and the second extension each completely cover the electrode.
10. The flexible solar cell module of claim 6 wherein the solder ribbons are independent of one another.
11. The flexible solar cell module of claim 6 wherein the solder ribbon is a tinned copper ribbon.
12. The flexible solar cell module of claim 6 wherein the solar cell has a thickness of 2 μm to 200 μm.
13. The flexible solar cell module as claimed in claim 6, wherein the short-circuit currents of two adjacent solar cells differ by less than or equal to 2%.
14. The flexible solar cell module of claim 6 wherein the flexible encapsulant film has a thickness of 0.02mm to 2 mm.
15. The flexible solar cell module of claim 6 wherein the flexible substrate has a thickness of 0.2mm to 5 mm.
16. The flexible solar cell assembly of claim 6 wherein the flexible substrate comprises one of a PI substrate, a carbon fiber plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810993222.6A CN110931586A (en) | 2018-08-29 | 2018-08-29 | Solder strip and flexible solar cell module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810993222.6A CN110931586A (en) | 2018-08-29 | 2018-08-29 | Solder strip and flexible solar cell module |
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| CN110931586A true CN110931586A (en) | 2020-03-27 |
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| CN112582489A (en) * | 2020-11-27 | 2021-03-30 | 上海空间电源研究所 | Flexible thin film solar cell with side wall short circuit prevention structure and preparation method thereof |
| CN116613234A (en) * | 2023-06-07 | 2023-08-18 | 昆山工研院新型平板显示技术中心有限公司 | Solar cell module and preparation method thereof |
| US11862744B1 (en) | 2022-09-28 | 2024-01-02 | Jinko Solar (Haining) Co., Ltd. | Photovoltaic module and method for preparing the photovoltaic module |
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Application publication date: 20200327 |