CN111384192A - Special-shaped tin-coated copper strip and preparation method thereof - Google Patents
Special-shaped tin-coated copper strip and preparation method thereof Download PDFInfo
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- CN111384192A CN111384192A CN202010365155.0A CN202010365155A CN111384192A CN 111384192 A CN111384192 A CN 111384192A CN 202010365155 A CN202010365155 A CN 202010365155A CN 111384192 A CN111384192 A CN 111384192A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 117
- 239000010949 copper Substances 0.000 title claims abstract description 117
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229910000679 solder Inorganic materials 0.000 claims abstract description 22
- 238000003466 welding Methods 0.000 claims abstract description 22
- 238000003490 calendering Methods 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- 229910052787 antimony Inorganic materials 0.000 claims description 3
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 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
-
- 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
- H01L31/0512—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 made of a particular material or composition of materials
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to a special-shaped tin-coated copper strip and a preparation method thereof, which is characterized in that a special-shaped structure with a plurality of circulation units is continuously and alternately arranged along the length direction in a circulating manner, the special-shaped tin-coated copper strip unit of a single circulation unit comprises a first section, a second section in transitional connection with the first section and a third section in transitional connection with the second section, the cross sections of the first section and the third section are in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape, and the cross section of the second section is in a flat rectangular shape. The soft copper wire is extruded and rolled into a flat copper base band by a calendaring head mechanism; the knurling roller is extruded and formed up and down to prepare a patterned copper strip which is provided with a continuous trapezoidal toothed reflecting surface and a welding surface along the width direction in the length direction; and shaping by a sectional forming device, wherein the first section, the second section and the third section form a single circulation unit, and the special-shaped copper strips are continuously and alternately arranged in a circulation manner in the length direction and are coated with tin solder. The segment is arranged in a segmented mode, and the width of the segment welded on the front face of the battery is narrow, so that the light receiving area of the front face of the battery piece is increased.
Description
Technical Field
The invention relates to a special-shaped tin-coated copper strip and a preparation method thereof.
Background
At present, the shading problem of a photovoltaic tin-coated copper strip on a battery is difficult to effectively solve, if the width of the tin-coated copper strip is further reduced, the shading area can be reduced, but the series resistance of a component is increased, the power is finally lost and cannot be compensated, if the width of the tin-coated copper strip is reduced, the thickness is increased, although the internal resistance of the battery is improved, the defective rates of the component in the preparation process, such as the fragment rate, the white exposure, the hidden crack rate, the TC reliability and the like, are high, and the normal use of a production line is influenced.
In the prior art, products for improving the shading problem include a sectional type reflective welding strip and a triangular welding strip matched with a common flat welding strip (the production cost is high), reflective structures on the surfaces of the two tin-coated copper strips are arranged on one side of the surface of the tin-coated copper strip, the internal stress of the tin-coated copper strip is increased after the tin-coated copper strip is stretched and welded by series welding equipment, particularly, residual stress is released without clearance between the tin-coated copper strip and a cell after lamination, so that risks such as hidden cracks and fragments of the cell of a laminated photovoltaic module are easily caused, and the tin-coated copper strip with the heterogeneous surface in the current industry is only suitable for common photovoltaics and cannot be suitable for modules of the lamination and splicing module technology.
Therefore, a welding material without space between adjacent batteries after welding the positive and negative electrodes in series welding of the battery pieces is needed.
The thickness of the overlapping part between the batteries is thicker when the laminated assembly is manufactured and welded in series, so that the hidden cracking rate of the batteries is greatly increased, and the stitch welding design requirements of half and high-density assemblies cannot be met.
Due to the triangular section height problem, the component design needs to be provided with EVA or POE materials with higher gram weight, and the component manufacturing cost is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a special-shaped tin-coated copper strip and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a special-shaped tin-coated copper strip is characterized in that: the special-shaped tin-coated copper strip unit comprises a first section, a second section in transitional connection with the first section and a third section in transitional connection with the second section, wherein the cross section of the first section is in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape, the cross section of the second section is in a flat rectangular shape, the cross section of the third section is in a flat shape, a round shape, a D-shaped semicircular shape or a trapezoid shape, and the first section and the second section are provided with a light reflecting surface and a welding surface in the length direction.
Furthermore, the special-shaped tin-coated copper strip is characterized in that the length of the first section is 20 mm-80 mm, the width is 0.2 mm-1.0 mm, and the height is 0.2 mm-0.6 mm.
Furthermore, the special-shaped tin-coated copper strip is characterized in that the length of the second section is 0.2-10 mm, the width is 0.2-2.0 mm, and the height is 0.05-0.6 mm.
Furthermore, the special-shaped tin-coated copper strip is characterized in that the length of the third section is 20 mm-80 mm, the width of the third section is 0.2 mm-2.0 mm, and the height of the third section is 0.05 mm-0.6 mm.
Furthermore, according to the special-shaped tin-coated copper strip, the light reflecting surfaces of the first section and the third section are provided with trapezoidal toothed light reflecting structures which are continuously arranged along the width direction, and the welding surface is a smooth surface.
Further, the specially-shaped tin-coated copper strip is characterized in that mark points are arranged on the surfaces of the starting point of the first section and the tail end of the third section.
The invention discloses a preparation method of a special-shaped tin-coated copper strip, which comprises the following steps:
(1) stretching the copper rod to a soft copper wire by continuous drawing and continuous annealing equipment;
(2) the soft copper wire is extruded and rolled into a flat copper base band with the width of 0.2 mm-1.0 mm and the height of 0.05 mm-0.6 mm by upper and lower rollers of a calendaring head mechanism;
(3) extruding and molding the flat copper base band up and down through a knurling roller to prepare a patterned copper band which is provided with a continuous trapezoidal toothed reflecting surface and a welding surface along the width direction in the length direction;
(4) shaping the patterned copper strip by a sectional forming device, wherein the first section, the second section and the third section form a single circulation unit and the patterned copper strip is continuously and alternately arranged in a circulation manner in the length direction; the first section and the second section are in uniform transitional connection with each other, and the second section and the third section are in uniform transitional connection with each other; the cross section of the first section is in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape, the cross section of the second section is in a flat rectangular shape, and the cross section of the third section is in a flat shape, a round shape, a D-shaped semicircular shape or a trapezoid shape;
(5) the special-shaped copper strip is subjected to heat treatment to release internal stress of materials, and then is subjected to hot dip tinning device to enable the surfaces of the first section, the second section and the third section of each circulation unit of the special-shaped copper strip to be coated with tin solder, and the surfaces of the special-shaped copper strip are coated with tin solder with the thickness of 5-30 microns to form the special-shaped tin-coated copper strip.
Furthermore, in the preparation method of the special-shaped tin-coated copper strip, the knurled roller comprises an upper roller and a lower roller, the surface of the roller body is continuously provided with a triangular structure, and the roller is made of steel, ceramic or hard alloy.
Furthermore, the preparation method of the special-shaped tin-coated copper strip comprises the steps that the segmented forming device comprises a constant-speed tension control device arranged at the front end and a roller device arranged at the rear end, the roller device is composed of an eccentric convex roller and a circular plane roller, the surface of the eccentric cam in the circumferential direction is provided with a plurality of step-shaped convex structures, the radial diameter of each step-shaped convex structure is 50-110 mm, and the central angle corresponding to the arc length of each step-shaped convex structure is 45-180 degrees; the upper surface of the circumference of the planar roller is a flat smooth surface, and the radial diameter of the upper surface is 50-110 mm;
the patterned copper strip enters a constant-speed tension control device, a light sensor on the constant-speed tension control device feeds back the identified length of the reflecting surface of the special-shaped copper strip to a PLC (programmable logic controller), the PLC controls a motor of the roller device to perform acceleration and deceleration movement, the length size of the second section is determined according to the length of the reflecting surface, and the cross section shape is formed.
Furthermore, the method for preparing the special-shaped tin-coated copper strip comprises the following steps that a hot dip tinning device comprises a mechanical rotary valve and a super air knife, wherein the mechanical rotary valve is controlled by a servo motor to act on a piston clockwise or anticlockwise to reciprocate in a cavity, the piston rod triggers a plurality of air holes formed in the wall of the cavity in the movement process of the piston rod in the cavity, and the air holes control the flow of gas to the super air knife; the programmable controller controls the air pressure of a mechanical rotary valve to control the air pressure of the super air knife, controls tin solder to perform subsection alternate coating and circular continuous operation on the surface of the special-shaped copper strip, coats coatings with different thicknesses on the surfaces of two adjacent sections of special-shaped copper strips with different sizes and shapes respectively, and forms the special-shaped tin-coated copper strip after the surface of the special-shaped copper strip is coated with the tin solder with the thickness of 5-30 microns; the tin solder is a tin-based solder alloy prepared by taking any two or three of tin, lead, bismuth, antimony, germanium, indium, silver and copper as main elements.
Furthermore, in the method for manufacturing the special-shaped tin-coated copper strip, mark points are marked on the surfaces of the starting points of the reflecting surfaces of two adjacent sections of the special-shaped tin-coated copper strips with different sizes and shapes as a group by a laser sectional marking device, and the mark points are circularly and continuously arranged at the starting points of each group of staggered surfaces of the special-shaped tin-coated copper strips in the length direction.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and is embodied in the following aspects:
① the invention relates to a special-shaped tin-coated copper strip, which is formed by a circulation unit consisting of a front section with a narrow width and a rear section with a wide width (flattening section) and a section with a wide width (flattening section) near the middle position, and is continuously and alternately arranged in the length direction, because the special-shaped tin-coated copper strip is arranged in sections and the width of the section welded on the front side of the battery is narrow, the light receiving area of the front side of the battery piece can be greatly increased;
② since the front and rear sections have a light reflecting structure on at least one surface (the shape of the section is not limited to flat, round, semicircular, triangular or trapezoidal, etc.), the middle position has a wider geometric width and a thinner flattened section, thus realizing the reduction of the sheet spacing (or elimination of the sheet spacing) after series welding with the battery sheet;
③, the number of battery pieces can be increased under the condition that the size of each module is not changed, higher conversion efficiency and power gain are obtained, and the conversion efficiency and power of the modules with the same size are obviously improved due to the reflection gain;
④ the shape of the front face of the battery is not limited to flat shape, but also can be trapezoidal, circular, semicircular D-shaped, triangular, etc., the window for enlarging the module layout design is convenient for the customer to match and design at will according to the technical route, the window can be applied to 5-grid-12-grid integral or half photovoltaic modules, the customer can select the best module design scheme reasonably according to the order requirement, the process window is enlarged, and the method is suitable for low-cost manufacture of half-piece, lamination and high-density modules stacked by various technologies.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts. The cross section of the material is in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape
FIG. 1: the invention discloses a schematic top view of a special-shaped tin-coated copper strip;
FIG. 2: a schematic structural diagram of a first section of a circular cross section of the special-shaped tin-coated copper strip;
FIG. 3: a schematic structural diagram of a trapezoidal section of a first section of the special-shaped tin-coated copper strip;
FIG. 4: a schematic structural diagram of a triangular cross section of a first section of the special-shaped tin-coated copper strip;
FIG. 5: a schematic structural diagram of a D-shaped semicircular cross section of a first section of the specially-shaped tin-coated copper strip;
FIG. 6: a schematic structural diagram of the light reflecting surface;
FIG. 7: the invention discloses a process flow diagram for preparing a special-shaped tin-coated copper strip;
FIG. 8: the effect of the special-shaped tin-coated copper strip on the lamination assembly is schematically shown in a series welding mode;
FIG. 9: the effect of the special-shaped tin-coated copper strip on the splicing piece assembly is schematically shown in the series welding.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the directional terms and the sequence terms, etc. are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a specially-shaped tin-coated copper strip is a specially-shaped structure with a plurality of circulation units, which are continuously and alternately arranged along the length direction in a circulating manner, the specially-shaped tin-coated copper strip unit of a single circulation unit comprises a first section 1, a second section 2 in transitional connection with the first section and a third section 3 in transitional connection with the second section, the cross section of the first section 1 is in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape, the cross section of the second section 2 is in a flat rectangular shape, the cross section of the third section 3 is in a flat shape, a round shape, a D-shaped semicircular shape or a trapezoid shape, and the first section 1 and the second section 3 are provided with a.
The cross-sectional shapes of the first section 1 and the third section 3 are circular as shown in fig. 2, trapezoidal as shown in fig. 3, triangular as shown in fig. 4, and semicircular in a shape like a letter D as shown in fig. 5. The surface of which is coated with a tin solder coating 5.
The length of the first section 1 is 20 mm-80 mm, the width is 0.2 mm-1.0 mm, and the height is 0.2 mm-0.6 mm.
The length of the second section 2 is 0.2 mm-10 mm, the width is 0.2 mm-2.0 mm, and the height is 0.05 mm-0.6 mm.
The third section 3 has a length of 20 mm-80 mm, a width of 0.2 mm-2.0 mm and a height of 0.05 mm-0.6 mm.
The light reflecting surfaces of the first section and the third section are provided with trapezoidal toothed light reflecting structures which are continuously arranged along the width direction, as shown in fig. 6; the welding surface is a smooth surface.
As shown in fig. 7, the preparation process of the special-shaped tin-coated copper strip of the invention comprises the following specific steps:
(1) adopting a copper rod with the mark TU1 and the wire diameter of 3mm to stretch the copper rod with the diameter of 3mm to a soft copper wire through continuous-drawing continuous-annealing equipment, wherein the elongation of the copper wire is 5-30%;
(2) the soft copper wire is extruded and rolled into a flat copper base band with the width of 0.2 mm-1.0 mm and the height of 0.05 mm-0.6 mm by upper and lower rollers of a calendaring head mechanism;
(3) the flat copper base band is extruded and formed up and down through a knurling roller to prepare a patterned copper band which is provided with a continuous trapezoidal toothed reflecting surface and a welding surface along the width in the length direction, and the triangular elevation angle is not limited to 30 degrees;
the knurling roller comprises an upper roller and a lower roller, the surface of the roller body is continuously provided with a triangular structure, and the rollers are made of steel, ceramics or hard alloy;
the patterned copper strip is provided with a plurality of continuous trapezoidal toothed light reflecting surfaces and a section of smooth surface which are staggered and continuously arranged from top to bottom in the width direction from a section of single surface in the length direction, the elevation angle of a triangle is not limited to 30 degrees, the cross section width is not limited to 0.2 mm-1.0 mm, and the height is 0.05 mm-0.6 mm;
(4) shaping the patterned copper strip by a sectional forming device, wherein the first section, the second section and the third section form a single circulation unit and the patterned copper strip is continuously and alternately arranged in a circulation manner in the length direction; the first section and the second section are in uniform transitional connection with each other, and the second section and the third section are in uniform transitional connection with each other; the cross section of the first section is in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape, the cross section of the second section is in a flat rectangular shape, and the cross section of the third section is in a flat shape, a round shape, a D-shaped semicircular shape or a trapezoid shape; the length of the first section is 20 mm-80 mm, the width is 0.2 mm-1.0 mm, the height is 0.2 mm-0.6 mm, the length of the second section is 0.2 mm-10 mm, the width is 0.2 mm-2.0 mm, the height is 0.05 mm-0.6 mm, the length of the third section is 20 mm-80 mm, the width is 0.2 mm-2.0 mm, and the height is 0.05 mm-0.6 mm;
the first section and the second section, and the second section and the third section are in integral transition connection, and the three sections form a circulating unit and are continuously and circularly arranged in the length direction;
the segmented forming device comprises a constant-speed tension control device arranged at the front end and a roller device arranged at the rear end, the roller device is composed of an eccentric convex roller and a circular plane roller, the circumferential surface of the eccentric cam is provided with a plurality of step-type convex structures, the radial diameter of each step-type convex structure is 50-110 mm, and the central angle corresponding to the arc length of each step-type convex structure is 45-180 degrees; the upper surface of the circumference of the planar roller is a flat smooth surface, and the radial diameter of the upper surface is 50-110 mm;
the patterned copper strip enters a constant-speed tension control device, a light sensor on the constant-speed tension control device feeds back the identified length of the reflecting surface of the special-shaped copper strip to a PLC (programmable logic controller), the PLC controls a motor of the roller device to perform acceleration and deceleration movement, the length size of the second section is determined according to the length of the reflecting surface, and the cross section shape is formed;
(5) the method comprises the following steps that the special-shaped copper strip passes through a heat treatment device to release internal stress of materials, then passes through a hot-dip tinning device to enable the surfaces of a first section, a second section and a third section of each circulation unit of the special-shaped copper strip to be coated with tin solder coatings, and tin solder with the thickness of 5-30 microns is coated on the surface of the special-shaped copper strip to form the special-shaped tin-coated copper strip;
the hot dip tinning device comprises a mechanical rotary valve and a super air knife, wherein the mechanical rotary valve is used for controlling a cam to act on a piston clockwise or anticlockwise to reciprocate in a cavity by a servo motor, the piston rod triggers a plurality of air holes formed in the wall of the cavity in the motion process in the cavity, and the air holes control the air flow to the super air knife; the programmable controller controls the air pressure of a mechanical rotary valve to control the air pressure of the super air knife, controls tin solder to perform subsection alternate coating and circular continuous operation on the surface of the special-shaped copper strip, coats coatings with different thicknesses on the surfaces of two adjacent sections of special-shaped copper strips with different sizes and shapes respectively, and forms the special-shaped tin-coated copper strip after the surface of the special-shaped copper strip is coated with the tin solder with the thickness of 5-30 microns; the tin solder is a tin-based solder alloy prepared by taking any two or three of tin, lead, bismuth, antimony, germanium, indium, silver and copper as main elements.
(6) Marking mark points on the surfaces of the starting points of the reflecting surfaces of two adjacent sections of the special-shaped tin-coated copper strips with different sizes and shapes as a group by a laser sectional marking device, wherein the mark points are circularly and continuously arranged at the starting points of each group of staggered surfaces of the special-shaped tin-coated copper strips in the length direction.
In specific application, as shown in fig. 8 and 9, the first section 1 of the specially-shaped tin-coated copper tape is arranged on the front surface of the first battery 101, the reflective surface 11 of the first section 1 faces upward, the soldering surface 12 of the first section 1 is soldered to the front surface of the first battery 101, the third section 3 is arranged on the back surface of the second battery 102, the reflective surface 31 of the third section 3 faces downward, the soldering surface 32 of the third section 3 is soldered to the back surface of the second battery 102, and the second section 2 (flattened section) is arranged at a position where the first battery 101 and the second battery 102 are overlapped.
The special-shaped tin-coated copper strip is a circulating unit consisting of a front section with a narrow width in the direction of the front section and a rear section with a wide width in the direction of the middle section (flattening section) and is continuously and alternately arranged in the length direction, and the special-shaped tin-coated copper strip is arranged in sections and is welded on the front side of a battery with a narrow width, so that the light receiving area of the front side of the battery piece can be greatly increased;
because the front section and the rear section of the solar cell are provided with the light reflecting structures on at least one surface (the shape of the sections is not limited to flat, round, semicircular, triangular or trapezoidal and other shapes with reflected light rays), and the flattening sections with wider geometric width and thinner thickness are arranged at the middle positions, the reduction of the sheet spacing (or the elimination of the sheet spacing) after the solar cell is in series welding with the solar cell is realized;
the number of the battery pieces can be increased under the condition that the size of each module is not changed, higher conversion efficiency and power gain are obtained, and the conversion efficiency and power of the modules with the same size are obviously improved due to the reflection gain;
because the shape of a section positioned on the front surface of the battery is not limited to flat, but also can be trapezoidal, circular, semicircular D-shaped, triangular and the like, the window for designing the module type is enlarged, and a customer can conveniently match and design the module type at will according to a technical route; the method can be applied to 5-12 grid whole or half photovoltaic modules, so that a customer can conveniently and reasonably select an optimal module design scheme according to order requirements, and a process window is enlarged; it is suitable for low-cost manufacture of high-density components of half-piece, laminated and various technologies.
Compared with the prior art, the invention can match different solder strip shape processes aiming at the front side (the first section) of the battery under different photovoltaic module technology application conditions, ensures that the module preparation realizes the lowest cost and simultaneously further strengthens the welding effect, thereby more effectively expanding the solder strip process window and maximizing the performance and improving the overall quality and cost performance of the photovoltaic module.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and shall be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (11)
1. A special-shaped tin-coated copper strip is characterized in that: the special-shaped tin-coated copper strip unit comprises a first section, a second section in transitional connection with the first section and a third section in transitional connection with the second section, wherein the cross section of the first section is in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape, the cross section of the second section is in a flat rectangular shape, the cross section of the third section is in a flat shape, a round shape, a D-shaped semicircular shape or a trapezoid shape, and the first section and the second section are provided with a light reflecting surface and a welding surface in the length direction.
2. The specially-shaped tin-coated copper strip as claimed in claim 1, wherein: the length of the first section is 20 mm-80 mm, the width is 0.2 mm-1.0 mm, and the height is 0.2 mm-0.6 mm.
3. The specially-shaped tin-coated copper strip as claimed in claim 1, wherein: the length of the second section is 0.2 mm-10 mm, the width is 0.2 mm-2.0 mm, and the height is 0.05 mm-0.6 mm.
4. The specially-shaped tin-coated copper strip as claimed in claim 1, wherein: the third section has a length of 20 mm-80 mm, a width of 0.2 mm-2.0 mm and a height of 0.05 mm-0.6 mm.
5. The specially-shaped tin-coated copper strip as claimed in claim 1, wherein: the reflecting surfaces of the first section and the third section are provided with trapezoidal toothed reflecting structures which are continuously arranged along the width direction, and the welding surface is a smooth surface.
6. The specially-shaped tin-coated copper strip as claimed in claim 1, wherein: mark points are arranged on the surface at the starting point of the first section and at the tail end of the third section.
7. The method for making the specially-shaped tin-coated copper strip as recited in claim 1, wherein: the method comprises the following steps:
(1) stretching the copper rod to a soft copper wire by continuous drawing and continuous annealing equipment;
(2) the soft copper wire is extruded and rolled into a flat copper base band with the width of 0.2 mm-1.0 mm and the height of 0.05 mm-0.6 mm by upper and lower rollers of a calendaring head mechanism;
(3) extruding and molding the flat copper base band up and down through a knurling roller to prepare a patterned copper band which is provided with a continuous trapezoidal toothed reflecting surface and a welding surface along the width direction in the length direction;
(4) shaping the patterned copper strip by a sectional forming device, wherein the first section, the second section and the third section form a single circulation unit and the patterned copper strip is continuously and alternately arranged in a circulation manner in the length direction; the first section and the second section are in uniform transitional connection with each other, and the second section and the third section are in uniform transitional connection with each other; the cross section of the first section is in an embossed flat shape, a round shape, a D-shaped semicircular shape, a trapezoid shape or a triangular shape, the cross section of the second section is in a flat rectangular shape, and the cross section of the third section is in a flat shape, a round shape, a D-shaped semicircular shape or a trapezoid shape;
(5) the special-shaped copper strip is subjected to heat treatment to release internal stress of materials, and then is subjected to hot dip tinning device to enable the surfaces of the first section, the second section and the third section of each circulation unit of the special-shaped copper strip to be coated with tin solder, and the surfaces of the special-shaped copper strip are coated with tin solder with the thickness of 5-30 microns to form the special-shaped tin-coated copper strip.
8. The method for manufacturing the specially-shaped tin-coated copper strip according to claim 7, wherein the method comprises the following steps: the knurling roll contains upper and lower roll, and the roll body surface is provided with the triangle-shaped structure in succession, and the roll material is steel, pottery or carbide.
9. The method for manufacturing the specially-shaped tin-coated copper strip according to claim 7, wherein the method comprises the following steps: the segmented forming device comprises a constant-speed tension control device arranged at the front end and a roller device arranged at the rear end, the roller device is composed of an eccentric convex roller and a circular plane roller, the circumferential surface of the eccentric cam is provided with a plurality of step-type convex structures, the radial diameter of each step-type convex structure is 50-110 mm, and the central angle corresponding to the arc length of each step-type convex structure is 45-180 degrees; the upper surface of the circumference of the planar roller is a flat smooth surface, and the radial diameter of the upper surface is 50-110 mm;
the patterned copper strip enters a constant-speed tension control device, a light sensor on the constant-speed tension control device feeds back the identified length of the reflecting surface of the special-shaped copper strip to a PLC (programmable logic controller), the PLC controls a motor of the roller device to perform acceleration and deceleration movement, the length size of the second section is determined according to the length of the reflecting surface, and the cross section shape is formed.
10. The method for manufacturing the specially-shaped tin-coated copper strip according to claim 7, wherein the method comprises the following steps: the hot dip tinning device comprises a mechanical rotary valve and a super air knife, wherein the mechanical rotary valve is used for controlling a cam to act on a piston clockwise or anticlockwise to reciprocate in a cavity by a servo motor, the piston rod triggers a plurality of air holes formed in the wall of the cavity in the motion process in the cavity, and the air holes control the air flow to the super air knife; the programmable controller controls the air pressure of a mechanical rotary valve to control the air pressure of the super air knife, controls tin solder to perform subsection alternate coating and circular continuous operation on the surface of the special-shaped copper strip, coats coatings with different thicknesses on the surfaces of two adjacent sections of special-shaped copper strips with different sizes and shapes respectively, and forms the special-shaped tin-coated copper strip after the surface of the special-shaped copper strip is coated with the tin solder with the thickness of 5-30 microns; the tin solder is a tin-based solder alloy prepared by taking any two or three of tin, lead, bismuth, antimony, germanium, indium, silver and copper as main elements.
11. The method for manufacturing the specially-shaped tin-coated copper strip according to claim 7, wherein the method comprises the following steps: marking mark points on the surfaces of the starting points of the reflecting surfaces of two adjacent sections of the special-shaped tin-coated copper strips with different sizes and shapes as a group by a laser sectional marking device, wherein the mark points are circularly and continuously arranged at the starting points of each group of staggered surfaces of the special-shaped tin-coated copper strips in the length direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010365155.0A CN111384192A (en) | 2020-04-30 | 2020-04-30 | Special-shaped tin-coated copper strip and preparation method thereof |
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| CN202010365155.0A CN111384192A (en) | 2020-04-30 | 2020-04-30 | Special-shaped tin-coated copper strip and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114074237A (en) * | 2020-08-10 | 2022-02-22 | 苏州阿特斯阳光电力科技有限公司 | Welding strip, photovoltaic module with same and processing method of welding strip |
-
2020
- 2020-04-30 CN CN202010365155.0A patent/CN111384192A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114074237A (en) * | 2020-08-10 | 2022-02-22 | 苏州阿特斯阳光电力科技有限公司 | Welding strip, photovoltaic module with same and processing method of welding strip |
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