CN115579413A - Converge area, converge area section and photovoltaic module - Google Patents
Converge area, converge area section and photovoltaic module Download PDFInfo
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- CN115579413A CN115579413A CN202211104648.4A CN202211104648A CN115579413A CN 115579413 A CN115579413 A CN 115579413A CN 202211104648 A CN202211104648 A CN 202211104648A CN 115579413 A CN115579413 A CN 115579413A
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- 230000003247 decreasing effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 238000003466 welding Methods 0.000 description 33
- 238000005096 rolling process Methods 0.000 description 19
- 230000007246 mechanism Effects 0.000 description 16
- 238000002360 preparation method Methods 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000003825 pressing Methods 0.000 description 7
- 229910000679 solder Inorganic materials 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 230000002596 correlated effect Effects 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
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- 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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- 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
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Abstract
The invention discloses a bus bar, a bus bar section and a photovoltaic module, wherein at least two cross sections of the bus bar section have cross section area difference, according to the current collection condition, a larger cross section area is adopted at a part with larger current, and a smaller cross section area is adopted at a part with smaller current, so that the consumption of conductive materials is reduced. Compared with the prior art, at least two cross sections of the bus-bar belt section have cross section area difference, and the corresponding cross section area of the bus-bar belt section can be selected according to the current intensity of each section in the photovoltaic module, so that the using amount of conductive materials of the bus-bar belt section is effectively reduced, and the production cost is reduced.
Description
The invention is a divisional application of invention patent with parent case name of bus bar, bus bar segment and preparation method thereof, photovoltaic module and production equipment thereof; the parent application has the application number: 2021108622046; the application date of the parent application is as follows: 7/29/2021.
Technical Field
The invention relates to the technical field of solar photovoltaic module manufacturing, in particular to a bus bar, a bus bar section and a photovoltaic module.
Background
In the manufacturing process of the solar photovoltaic module, after each string of solar cell strings welded by the series welding machine are typeset by the typesetting machine, a plurality of strings of cell strings need to be connected in series and in parallel through the confluence belt section, and the current collection of each cell piece is realized. In the prior art, the bus bar segment is obtained by intercepting a conventional bus bar, and the conventional bus bar is generally an equal-section bus bar, that is, a bus bar with equal cross-sectional area at each position. The cross-sectional area of the constant-section bus bar needs to meet the diversion requirement of the section with the maximum current intensity on the photovoltaic module, so that the material waste is caused by the redundancy of the section size of the constant-section bus bar in the section with the small partial current intensity.
Disclosure of Invention
The invention aims to provide a bus bar, a bus bar segment and a photovoltaic module, which are used for reducing the consumption of conductive materials and reducing the production cost.
In order to achieve the purpose, the invention provides the following scheme:
the invention discloses a bus-bar strip section, at least two cross sections have cross section area difference, according to the current collection condition, a larger cross section area is adopted at the part with larger current, and a smaller cross section area is adopted at the part with smaller current, so as to reduce the consumption of conductive materials.
Preferably, the cross-sectional area of the busbar section decreases gradually from one end to the other end.
Preferably, the cross-sectional area of the busbar section decreases stepwise from one end to the other end.
Preferably, the bus bar section comprises a plurality of stepped sections, any two stepped sections have cross section area difference, each stepped section is a constant section, and any two adjacent stepped sections are connected through a transition section.
Preferably, the bus bar segment comprises a first equal-section segment, a transition segment and a second equal-section segment which are connected in sequence, the cross-sectional area of the first equal-section segment is larger than that of the second equal-section segment, the first end of the transition segment is equal to that of the first equal-section segment, the second end of the transition segment is equal to that of the second equal-section segment, and the cross-sectional area of the transition segment is gradually reduced from the first end to the second end of the transition segment.
Preferably, the busbar section comprises a first and a second directly connected equal-section sections, the first equal-section having a larger cross-sectional area than the second equal-section.
Preferably, the bus bar section comprises variable cross-section sections distributed in pairs, and two variable cross-section sections in any pair of variable cross-section sections are distributed in mirror symmetry.
Preferably, in any pair of the variable section sections, one end of the variable section close to the symmetry plane is a first end, one end of the variable section far away from the symmetry plane is a second end, and the sectional area of the variable section is gradually increased or gradually reduced from the first end to the second end.
Preferably, in any pair of the variable section sections, one end of the variable section close to the symmetry plane is a first end, one end of the variable section far away from the symmetry plane is a second end, and the sectional area of the variable section increases in a stepped manner or decreases in a stepped manner along the length from the first end to the second end.
The invention discloses a confluence strap section, at least two cross sections of which have cross section product differences.
The invention also discloses a bus bar which is wound into a roll shape and is provided with at least one section of the bus bar section.
The invention also discloses a preparation method of the busbar section, which is used for forming the busbar section and comprises the following steps:
and rolling at least partial area of the bus bar with the uniform cross section to obtain the bus bar section.
The invention also discloses a preparation method of the busbar section, which is used for forming the busbar section and comprises the following steps:
and local or integral stretching is carried out within the plastic deformation range of the bus bar with the equal section to obtain the bus bar section.
The invention also discloses a preparation method of the busbar section, which is used for forming the busbar section and comprises the following steps:
and splicing or lapping the bus strips with different cross sections and equal sections to form the bus strip section.
Preferably, the splicing or overlapping method comprises bonding and welding.
The invention also discloses a photovoltaic module which comprises a battery string and the bus band section, wherein the battery string is connected in series and/or in parallel by the bus band section.
The invention also discloses photovoltaic module production equipment which comprises a transmission positioning device and a welding device, and further comprises confluence strap section forming equipment and a confluence strap section arrangement device, wherein the confluence strap section forming equipment is used for preparing the confluence strap section, the transmission positioning device is used for conveying the glass placed with the battery string to a welding station, the confluence strap section arrangement device is used for arranging the confluence strap section on the welding device, and the welding device is used for welding the confluence strap section with a welding strap of the battery string.
Preferably, the bus bar strip segment forming device comprises a uniform-section bus bar supply device and a strip pulling device, wherein the uniform-section bus bar supply device is used for supplying a rolled uniform-section bus bar, and the strip pulling device is used for drawing the uniform-section bus bar by means of plastic deformation generated by drawing to obtain the bus bar strip segment.
Preferably, the belt pulling device comprises a fixed belt clamping hand, a stretching belt clamping hand, a movable cutter and a traction belt clamping hand which are sequentially arranged, the traction belt clamping hand is used for clamping one end of the bus belt with the uniform cross section and carrying out traction, and the fixed belt clamping hand and the stretching belt clamping hand can clamp and loosen the bus belt with the uniform cross section; after the constant-section bus bar is clamped by the fixed clamping hand and the stretching clamping hand, the stretching clamping hand can move towards one side far away from the fixed clamping hand so as to stretch the constant-section bus bar and obtain a bus bar section; the movable cutter is used for cutting off the busbar section.
Preferably, the bus bar strip segment forming device comprises a uniform-section bus bar supply device and a strip pressing device, the uniform-section bus bar supply device is used for supplying a rolled uniform-section bus bar, and the strip pressing device is used for drawing one end of the uniform-section bus bar and rolling the uniform-section bus bar to form the bus bar strip segment.
Preferably, the belt pressing device comprises a fixed clamping belt hand, a rolling mechanism, a movable cutter and a traction clamping belt hand which are sequentially arranged, the rolling mechanism comprises an upper roll shaft and a lower roll shaft, and the traction clamping belt hand is used for clamping one end of the uniform-section bus belt and performing traction; when the traction belt clamp hand pulls the uniform-section bus strips, the upper roll shaft and the lower roll shaft can respectively compress the uniform-section bus strips from the upper side and the lower side and synchronously rotate with the uniform-section bus strips so as to roll the uniform-section bus strips, and then the bus strip sections are obtained; the movable cutter is used for cutting off the busbar section.
Preferably, the bus bar segment forming device comprises at least two uniform-section bus bar supply devices, at least two traction mechanisms and at least one bonding device, wherein the at least two uniform-section bus bar supply devices are used for supplying at least two kinds of uniform-section bus bars with different cross-sectional areas, the at least two traction mechanisms are respectively used for drawing the two kinds of uniform-section bus bars, and the at least one bonding device is used for bonding and fixing the at least two kinds of uniform-section bus bars to obtain the bus bar segment.
The invention also discloses a photovoltaic module which comprises the busbar section and the battery string group; the bus strip section comprises a head bus strip section, a middle bus strip section and a tail bus strip section; the battery string group comprises a first battery string group and a second battery string group;
the first battery string group and the second battery string group are vertically symmetrical, and both the first battery string group and the second battery string group comprise a plurality of battery strings which are vertically arranged in parallel; the two ends of the first battery string group are respectively connected with the head bus-bar band section and the middle bus-bar band section, and the two ends of the second battery string group are respectively connected with the middle bus-bar band section and the tail bus-bar band section; the head bus band section and the tail bus band section have the same structure and are symmetrical to each other;
the middle bus-bar strip section comprises three bus-bar strip sections, wherein an outgoing line connector is arranged between every two adjacent bus-bar strip sections; the outgoing line connector is connected with the junction box and used for supplying power to the outside; the cross-sectional area of the bus bar section of the middle bus bar section near the outgoing line connector is relatively larger so as to collect relatively more current; the cross-sectional area of the portion of the strap section of the middle strap section remote from the outgoing line connector is relatively small to collect relatively small current.
Compared with the prior art, the invention has the following technical effects:
at least two cross sections of the bus-bar belt section have cross section area difference, and the corresponding cross section area of the bus-bar belt section can be selected according to the current intensity of each section in the photovoltaic module, so that the use amount of conductive materials of the bus-bar belt section is effectively reduced, and the production cost is reduced. The bus bar and the photovoltaic module also have the technical effects corresponding to the bus bar section, and the details are not repeated here.
Drawings
In order to more clearly illustrate the technical solutions in the present embodiment or the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a uniform cross-section bus bar in roll form;
FIG. 2 is a schematic view of a bus bar of this embodiment;
FIG. 3 is a schematic view of a bus bar of yet another embodiment;
FIG. 4 is a schematic view showing the cross-sectional area of the bus bar segment of this embodiment gradually decreasing from one end to the other end;
FIG. 5 is a schematic view of a bus bar segment of the present embodiment having a cross-sectional area that decreases stepwise from one end to the other end;
FIG. 6 is a schematic view of another embodiment of the cross-sectional area of the bus bar segment of the present embodiment decreasing stepwise from one end to the other end;
FIG. 7 is a front view of a photovoltaic module according to one embodiment of the present invention;
FIG. 8 is a bottom view of the photovoltaic assembly of FIG. 7;
FIG. 9 is a partial enlarged view of portion A of FIG. 7;
FIG. 10 is a comparison of the arrangement of uniform cross-section bus strips and bus strip segments of FIG. 9;
FIG. 11 is a schematic structural view of a photovoltaic module production apparatus;
FIG. 12 is a schematic view of a portion of the structure of FIG. 11;
FIG. 13 is a schematic view of a construction of the bus bar segment forming apparatus;
FIG. 14 is a schematic view of another embodiment of a bus bar segment forming apparatus;
FIG. 15 is a schematic view of a construction of a bus bar segment;
FIG. 16 is a schematic view of yet another construction of a bus bar segment;
FIG. 17 is a schematic view of yet another construction of a bus bar segment;
fig. 18 is a schematic view of another construction of a busbar section.
Description of reference numerals: 100 equal-section bus bars; 200 bus bars; 21 a busbar section; 211 a first constant cross-section; 212 a transition section; 213 second bisected section; 300 a photovoltaic module; 31 a first battery string; 32 a second battery string; 33 a header strap segment; 34 a middle strap segment; 35 tail bus band section; 341 outgoing line joint; 342 a first strap segment; 343 a second strap section; 344 third busbar segment; 400, photovoltaic module production equipment; 41 a bus bar segment arranging device; 42 transmitting the positioning device; 43 a welding device; 44 a bus bar segment forming device; 431 a header welding station; 432 a middle welding table; 433 a tail welding table; 441 equal-section bus bar supply devices; 442 a drawstring device; 4421 fixing the clamping hand; 4422 stretching the clamping hand; 4423 moving the cutter; 4424 drawing the clamping hand; 443 a belt press device; 4431 a rolling mechanism.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments, 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. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention aims to provide a bus bar, a bus bar segment and a preparation method thereof, a photovoltaic module and production equipment thereof, which are used for reducing the consumption of conductive materials and reducing the production cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 4 to 6, the present embodiment firstly provides a bus bar strip segment 21, which is used for connecting the head ends and/or the tail ends of several cell strings in the production process of the photovoltaic module 300, and at least two cross sections of the bus bar strip segment 21 have a cross-sectional area difference. As will be appreciated by those skilled in the art, to reduce the heat loss of the wire during current transmission, the cross-sectional area of the wire is typically positively correlated with the current. In the prior art, the photovoltaic module generally uses the equal-section bus bar 100, the cross-sectional area of the equal-section bus bar 100 is equal everywhere, and the cross-sectional area needs to meet the diversion requirement of the section with the maximum current intensity on the photovoltaic module, so that the conductive material is wasted in the section with the small current intensity. The bus-bar strip section 21 of the embodiment can select the corresponding cross-sectional area of the bus-bar strip section 21 according to the current intensity of each section in the photovoltaic module 300, so that the usage amount of the conductive material of the bus-bar strip section 21 is effectively reduced, and the production cost is reduced.
The cross-sectional area of the busbar section 21 can be varied in various ways, and can be selected by those skilled in the art according to actual needs. For example:
in the scheme 1, the cross-sectional area of the bus bar segment 21 is gradually reduced from one end to the other end (as shown in fig. 4);
scheme 2, for example, the cross-sectional area of the bus bar segment 21 decreases stepwise from one end to the other (as shown in fig. 5, 6, 16, 17);
scheme 3, the bus bar strip section 21 includes variable cross-section sections distributed in pairs, and two variable cross-section sections in any pair of variable cross-section sections are distributed in a mirror symmetry manner (as shown in fig. 15 and fig. 18).
As for the scheme 2, the bus bar segment 21 may include a plurality of step segments, any two step segments have a cross-sectional area difference, each step segment is a uniform-section segment, and any two adjacent step segments are connected by a transition segment.
In an actual product, the number of the step sections can be flexibly determined according to the number of the cell strings to be connected to the photovoltaic module, and as an example, referring to fig. 5 and 6, the bus bar strip section 21 may include a first equal cross-section 211, a transition section 212 and a second equal cross-section 213 which are connected in sequence. The cross-sectional area of the first equal-section 211 is larger than that of the second equal-section 213, the first end of the transition section 212 is equal to that of the first equal-section 211, the second end of the transition section 212 is equal to that of the second equal-section 213, and the cross-sectional area of the transition section 212 gradually decreases from the first end to the second end thereof.
With respect to option 2, the bus strip segment 21 may also include a first equal-cross-sectional segment 211 and a second equal-cross-sectional segment 213 directly connected (i.e., with the transition segment 212 removed), the first equal-cross-sectional segment 211 having a cross-sectional area greater than the cross-sectional area of the second equal-cross-sectional segment 213.
For the scheme 3, in any pair of variable section sections, one end of each variable section, which is close to the symmetry plane, is a first end, and one end of each variable section, which is far away from the symmetry plane, is a second end. The sectional area of the variable section can be gradually increased or gradually reduced or can be gradually increased or reduced along the first end to the second end.
The busbar section 21 is preferably of a flat configuration with a cross-sectional shape that is approximately rectangular. Thus, the cross-sectional area varies by factors of width and thickness. Now, the width of the end with the larger cross-sectional area of the bus bar segment 21 is set to be X and the thickness is set to be T1, and the width of the end with the smaller cross-sectional area of the bus bar segment 21 is set to be Y and the thickness is set to be T2. The above-mentioned solutions of gradually decreasing cross-sectional area can be the following cases:
the thickness of each bus bar segment 21 is the same, and the width of the bus bar segment 21 decreases continuously from one end to the other end (as shown in fig. 4, T1= T2, X > Y); the width of each bus bar segment 21 is the same, and the thickness of the bus bar segment 21 is continuously decreased from one end to the other end (X = Y, T1> T2); the width and the thickness of the bus-bar strip section 21 decrease continuously from one end to the other end (X > Y, T1> T2).
The cross-sectional area of the bus bar section 21 (including the transition section 212) is reduced in a stepwise manner as follows:
the first equal cross-section 211, the transition section 212 and the second equal cross-section 213 have the same thickness, and the width of the transition section 212 continuously decreases from one end to the other end (as shown in fig. 5, T1= T2, X > Y); the first equal cross-section 211, the transition section 212, and the second equal cross-section 213 have the same width, and the thickness of the transition section 212 decreases continuously from one end to the other end (as shown in fig. 6, X = Y, T1> T2).
Fig. 15-18 show several possible forms of the bus bar segment 21, fig. 15 and 18 show a version 3, fig. 16 and 17 show a version 2, and the direction of the arrows in fig. 15-17 shows the direction of the current flow in the bus bar segment 21. In fig. 15, the bus bar strip section 21 has a pair of variable cross-section sections, the pair of variable cross-section sections are arranged in a mirror symmetry manner, the cross-sectional area of the middle part of the bus bar strip section 21 is larger than the cross-sectional areas of the left part and the right part, and the current on the bus bar strip section 21 is collected to the middle part from the left part and the right part and flows out through a welding strip connected with the middle part; in fig. 16, the cross-sectional area of the right part of the bus bar segment 21 is larger than that of the left part, and the current on the variable cross-section bus bar 200 is collected from the left part to the right part and flows out through the solder strip connected with the right part; in fig. 17, the cross-sectional area of the right part of the bus bar strip section 21 is larger than that of the middle part, the cross-sectional area of the middle part is larger than that of the left part, and the current on the bus bar strip section 21 is collected from the left part to the right part through the middle part and flows out through the solder strip connected with the right part; in fig. 18, the bus bar strip section 21 has a pair of variable cross-section sections, the pair of variable cross-section sections are arranged in a mirror symmetry manner, the cross-sectional area of the middle part of the bus bar strip section 21 is smaller than the cross-sectional areas of the left part and the right part, and the current on the bus bar strip section 21 is respectively collected from the middle part to the left part and the right part to the right part, and flows out through the solder strip connected with the left part and the solder strip connected with the right part.
As shown in fig. 2 to 3, the present embodiment also provides a bus bar 200, the bus bar 200 is usually wound into a roll shape, and the core of the bus bar 200 provided in the present embodiment is that the bus bar 200 has at least one section of the bus bar segment 21 described above.
It should be noted that the material of the bus bar segment 21 in this embodiment may be a copper-based surface plated with tin, or may be other materials with conductive performance, and it is within the protection scope of the present invention as long as the bus bar segment meets the shape and feature requirements of this embodiment and can be used as a bus bar of a solar cell panel.
The present embodiment further provides a method for preparing a bus bar segment 21, which is used to form the bus bar segment 21, and includes the following steps:
at least a partial region of the bus bar 100 having the uniform cross section is rolled to obtain a bus bar segment 21.
The present embodiment also provides another method for preparing the bus bar segment 21, which is used to form the bus bar segment 21, and comprises the following steps:
within the plastic deformation range of the busbar section 21, a partial or total stretching is carried out, resulting in a busbar section 21.
The present embodiment also provides another method for preparing the bus bar segment 21, which is used to form the bus bar segment 21, and comprises the following steps:
the bus strips 100 with the equal cross sections and different cross sections are spliced or lapped to form the bus strip section 21.
The splicing or overlapping may be performed by bonding or welding, or may be performed by other methods such as clamping two uniform-section bus bars 100 by a clamping member, as long as the two uniform-section bus bars 100 are integrally formed.
As shown in fig. 7 to fig. 14, the present embodiment further provides a photovoltaic module 300, which includes a battery string, and further includes the above-mentioned bus-strip segment 21, where the battery string is connected in series and/or in parallel by the bus-strip segment 21. Because the photovoltaic module 300 uses the busbar section 21, the corresponding cross-sectional area can be selected according to the current intensity of each section of the busbar section 21, so that the material usage amount of the busbar section 21 is effectively reduced, and the production cost is reduced.
Taking the photovoltaic module 300 shown in fig. 7 as an example, the cell string components on the photovoltaic module 300 are a first cell string component 31 and a second cell string component 32 that are symmetrical up and down, and both the first cell string component 31 and the second cell string component 32 include a plurality of cell strings that are vertically arranged in parallel. The first battery string 31 has two ends connected to the head bus bar section 33 and the middle bus bar section 34, respectively, and the second battery string 32 has two ends connected to the middle bus bar section 34 and the tail bus bar section 35, respectively. The leading bus bar segment 33 and the trailing bus bar segment 35 are identical in structure and symmetrical to each other. A plurality of outgoing line connectors 341 are distributed on the middle bus bar section 34, and the outgoing line connectors 341 are connected with the junction box and used for supplying power to the outside.
As shown in fig. 8 to 10, the middle bus bar segment 34 includes three bus bar segments 21, one outgoing line connector 341 is disposed between two adjacent bus bar segments 21, and two outgoing line connectors 341 are disposed on the middle bus bar segment 34. The part of the bus bar section 21 close to the outgoing line connector 341 collects the current generated by the plurality of groups of battery strings, the current passing through the bus bar section is larger, and the corresponding cross-sectional area is larger; the part of the busbar section 21 remote from the outgoing line connector 341 collects only the current output by a single or a few cell strings, which passes a smaller current and accordingly has a smaller cross-sectional area.
Fig. 9 is a schematic structural diagram of the photovoltaic module 300 of fig. 7 at the middle bus bar segment 34, and the current on the middle bus bar segment 34 at both sides of the outgoing line connector 341 is converged to the outgoing line connector 341.
Fig. 10 is a comparison graph of the dose length of the selected equal-section bus bar 100 of the solar cell module with the dose length of the bus bar segment 21 in the embodiment prepared by using the equal-section bus bar 100. The top middle of fig. 10 is the first busbar segment 342, which is the amount of the busbar segment 34 required to run the middle using the constant cross section busbar 100; the lower part is a second busbar section 343, which is the required amount for laying the middle busbar section 34 by using the busbar section 21 of the present embodiment; the middle portion is the third busbar segment 344, which is the amount of the constant cross-section busbar 100 required to make the second busbar segment 343.
The third bus bar segment 344 is stretched by a secondary stretching method into a second bus bar segment 343 having the same length as the first bus bar segment 342. Since the second bus bar segment 343 forms the bus bar segment 21 disclosed in the present embodiment, the use length and cost of the assembly for the cross-sectional bus bar 100 are significantly saved by using the bus bar segment 21 without affecting the battery output current.
Tests prove that the maximum stretching amount of the conventional constant-section bus bar 100 is 30% of the original length under the condition of ensuring that the tin layer on the surface of the constant-section bus bar 100 can meet the welding use requirement. If the bus bar segments 21 in a certain photovoltaic module 300 are all made of the bus bar strips 100 with the equal cross sections, the length of the bus bar strips 100 with the equal cross sections is about 6 meters, and the cost of the bus bar strips 100 with the equal cross sections is about 8 yuan. If a 4.6 meter long uniform cross-section bus bar 100 is stretched by 30% to obtain a 6 meter long bus bar segment 21, the cost of the uniform cross-section bus bar 100 used is about 7.2 yuan, which saves 0.8 yuan. Likewise, the material cost of the photovoltaic module 300 prepared from the busbar section 21 is saved by 0.8 yuan. 1 balance of 1 photovoltaic module production equipment produces 4000 assemblies, so that 3200 yuan can be saved in 1 day by 1 photovoltaic module production equipment, and 1168000 yuan can be saved in 1 year by the same way by 1 photovoltaic module production equipment. Therefore, the bus bar strip section 21 provided by the invention has great economic effect and advantage, wherein the best welding effect can be achieved when the stretching amount of the bus bar strip section 21 is 20% of the original length, and the method can be used as a concrete implementation basis.
As shown in fig. 11 to 14, the present embodiment also provides a photovoltaic module production apparatus 400, which uses a bus bar segment 21 to solder the solder strips at the ends of the cell strings outputted from the front-end production line apparatus and arranged on the glass plate. The photovoltaic module production equipment 400 comprises a conveying positioning device 42 and a welding device 43, and further comprises a busbar section forming device 44 and a busbar section arranging device 41, wherein the busbar section forming device 44 is used for preparing the busbar section 21. The conveying and positioning device 42 is used for conveying the glass with the battery strings to the welding station, and the bus bar strip section arrangement device 41 is used for arranging the bus bar strip section 21 on the welding device 43. The welding device 43 is used for welding the bus bar strip section 21 with the welding strip of the battery string.
In the present embodiment, the number of the bus bar segment forming devices 44 is two, and the first forming device is used for preparing the leading bus bar segment 33 and the trailing bus bar segment 35 in the photovoltaic module 300, and the second forming device is used for preparing the middle bus bar segment 34 in the photovoltaic module 300. The bus bar segment arrangement devices 41 are two, and are a first arrangement device for arranging the leading bus bar segment 33 or the trailing bus bar segment 35 and a second arrangement device for arranging the middle bus bar segment 34, respectively. The three welding devices 43 are respectively a head welding stage 431, a middle welding stage 432 and a tail welding stage 433, and are respectively used for welding the head bus bar section 33, the middle bus bar section 34 and the tail bus bar section 35. Other numbers of busbar segment forming devices 44, busbar segment arranging devices 41 and welding devices 43 may be selected depending on the actual structure of the photovoltaic module 300.
When the device is used, the first forming device completes preparation of the head bus-bar strip section 33, the first arranging device transfers the head bus-bar strip section 33 to the head welding table 431, the first forming device completes preparation of the tail bus-bar strip section 35 with the same specification as the head bus-bar strip section 33, the first arranging device transfers the tail bus-bar strip section 35 to the tail welding table 433, the second forming device completes preparation of the middle bus-bar strip section 34, the second arranging device transfers the middle bus-bar strip section to the middle welding table 432, and the bus-bar strip section 21 on the welding table is welded with the head or tail welding strips of the battery string.
There are a variety of types of bus bar segment forming devices 44 that can be used to produce the variable cross-section bus bar 200 described above in a variety of ways. The bus bar segment molding apparatus 44 in fig. 13 includes a constant-section bus bar supply device 441 and a tape drawing device 442, the constant-section bus bar supply device 441 is used for supplying a constant-section bus bar 100 in a roll shape, and the tape drawing device 442 is used for drawing the constant-section bus bar 100 by means of stretching to generate plastic deformation, so as to obtain the bus bar segment 21.
Specifically, the belt drawing device 442 comprises a fixed clamping hand 4421, a stretching clamping hand 4422, a moving cutter 4423 and a traction clamping hand 4424 which are sequentially arranged, wherein the traction clamping hand 4424 is used for clamping and drawing one end of the uniform-section converging belt 100, and the fixed clamping hand 4421 and the stretching clamping hand 4422 can clamp and release the uniform-section converging belt 100; after the constant-section bus bar 100 is clamped by the fixed clamping hand 4421 and the stretching clamping hand 4422, the stretching clamping hand 4422 can move towards the side far away from the fixed clamping hand 4421 to stretch the constant-section bus bar 100 to obtain a bus bar section 21; the moving cutter 4423 is used to cut off the bus bar segment 21.
When the tape drawing device 442 is used, first, the end of the rolled uniform cross-section bus tape 100 is sequentially passed through the fixed clamp hand 4421, the stretching clamp hand 4422, and the moving cutter 4423 by manual drawing, and finally, is clamped by the drawing clamp hand 4424. Then, the constant-section bus bar 100 is released by the fixed clamping hand 4421 and the stretching clamping hand 4422 and kept in place, the constant-section bus bar 100 is clamped by the drawing clamping hand 4424 and is moved away from the moving cutter 4423 in a translation manner, the length of the constant-section bus bar 100 between the clamping point of the drawing clamping hand 4424 and the clamping point of the stretching clamping hand 4422 is equal to the length of the undrawn reserved section on the variable-section bus bar 200, and the distance between the clamping point of the stretching clamping hand 4422 and the fixed clamping hand 4421 is equal to the predicted length of the stretched section on the variable-section bus bar 200 before stretching. Then, the constant-section bus bar 100 is held by the fixed clamp finger 4421 and the stretching clamp finger 4422, and the stretching clamp finger 4422 and the drawing clamp finger 4424 are displaced in synchronization toward the side away from the fixed clamp finger 4421, so that the distance between the fixed clamp finger 4421 and the stretching clamp finger 4422 becomes the stretching target length, thereby obtaining the bus bar segment 21. And pulling the clamping hand 4424 to continuously displace towards the side far away from the fixed clamping hand 4421, and moving the cutting point of the bus-bar strip section 21 to the movable cutter 4423 for cutting, thereby completing the preparation of the bus-bar strip section 21 in one period. When the bus bar strip segment 21 is continuously prepared, the movable cutter 4423 is moved to the stretching clamp hand 4422 after completing the cutting operation, so that the cut head of the bus bar strip segment 21 is exposed, and the clamping hand 4424 is pulled to perform secondary clamping.
The bus bar segment forming apparatus 44 in fig. 14 includes an equal-section bus bar supplying device 441 and a tape pressing device 443, the equal-section bus bar supplying device 441 is used for supplying a rolled equal-section bus bar 100, and the tape pressing device 443 is used for drawing one end of the equal-section bus bar 100 and rolling the equal-section bus bar 100 to form the bus bar segment 21.
Specifically, the tape pressing device 443 includes a fixed clamping hand 4421, a rolling mechanism 4431, a movable cutting knife 4423 and a traction clamping hand 4424 which are sequentially arranged, the rolling mechanism 4431 includes an upper roller shaft and a lower roller shaft, and the traction clamping hand 4424 is used for clamping and drawing one end of the uniform-section converging tape 100; when the uniform-section bus belt 100 is pulled by the pulling clamp belt 4424, the upper roll shaft and the lower roll shaft can respectively press the uniform-section bus belt 100 from the upper side and the lower side and synchronously rotate with the uniform-section bus belt 100 (namely the rotating linear speeds of the upper roll shaft and the lower roll shaft are the same as the pulling speed of the pulling clamp belt), so as to roll the uniform-section bus belt 100, and obtain a bus belt segment 21; the moving cutter 4423 is used to cut off the bus bar strip segment 21.
When the tape pressing device 443 is used, first, the end portion of the rolled uniform cross-section bus tape 100 is sequentially passed through the fixed clamping hand 4421, the rolling mechanism 4431 (passed between the upper and lower rolls), the moving cutter 4423, and finally clamped by the pulled clamping hand 4424 by means of manual pulling. Then, the constant cross-section converging belt 100 is released by the fixed clamping hand 4421 and the rolling mechanism 4431 and kept in place, the constant cross-section converging belt 100 is clamped by the drawing clamping hand 4424 and is moved away from the moving cutter 4423 in a translation manner, the length of the constant cross-section converging belt 100 between the clamping point of the drawing clamping hand 4424 and the clamping point of the rolling mechanism 4431 is equal to the length of the reserved section of the converging belt section 21 which is not rolled, and the distance between the clamping point of the rolling mechanism 4431 and the fixed clamping hand 4421 is equal to the predicted length of the converging belt section 21 before rolling. Then, the rolling mechanism 4431 grips the bus bar 100 having a uniform cross section, the rolling mechanism 4431 and the drawing gripper 4424 are synchronously displaced to the side away from the fixed gripper 4421, and the rolling length is changed to the rolling target length in synchronization with the rotational linear speed of the upper roller shaft and the lower roller shaft and the moving speed of the drawing gripper 4424, thereby obtaining the bus bar segment 21. After the rolling is finished, the drawing clamping hand 4424 is continuously shifted to the side far away from the fixed clamping hand 4421, and the cutting point of the confluence belt segment 21 is shifted to the moving cutter 4423 to be cut, so that the preparation of the confluence belt segment 21 in one cycle is completed. When the bus bar tape piece 21 is continuously manufactured, the movable cutter 4423 is moved to the rolling mechanism 4431 after the cutting operation is completed, so that the cut head of the bus bar tape piece 21 is exposed, and the clamping hand 4424 is pulled to perform secondary clamping.
Furthermore, the bus bar strip segment forming apparatus 44 may also include at least two uniform-section bus bar strip supply devices 441, at least two traction mechanisms, and at least one bonding device, where the at least two uniform-section bus bar strip supply devices 441 are used to supply at least two kinds of uniform-section bus bar strips 100 with different cross-sectional areas, the at least two traction mechanisms are respectively used to pull the at least two kinds of uniform-section bus bar strips 100, and the at least one bonding device is used to bond and fix the at least two kinds of uniform-section bus bar strips 100 to obtain the bus bar strip segment 21, and the cross-sectional area of the bus bar strip segment 21 changes stepwise from one end to the other end, but does not have a transition segment.
The movement modes of the stretching/pinching hand 4422, the moving/cutting blade 4423, and the pulling/pinching hand 4424 are preferably sliding/translating, and may be other modes such as sliding/translating on a linear guide rail, sliding/translating in a linear slide groove, and the like.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (10)
1. A bus bar segment, wherein at least two cross sections have a difference in cross sectional area, and depending on the convergence of current, a larger cross sectional area is used in a portion where current is larger and a smaller cross sectional area is used in a portion where current is smaller, to reduce consumption of conductive material.
2. The busbar segment according to claim 1, wherein the cross-sectional area of the busbar segment decreases from end to end.
3. The busbar segment according to claim 1, wherein the cross-sectional area of the busbar segment decreases stepwise from one end to the other end.
4. The bus bar segment according to claim 3, wherein said bus bar segment comprises a plurality of stepped segments, any two of said stepped segments having a cross sectional area difference, each of said stepped segments being a constant section, any two adjacent stepped segments being connected by a transition section.
5. The busbar segment according to claim 4, comprising a first equal-section segment (211), a transition segment (212) and a second equal-section segment (213) connected in sequence, wherein the cross-sectional area of the first equal-section segment (211) is larger than that of the second equal-section segment (213), the first end of the transition segment (212) is equal to that of the first equal-section segment (211), the second end of the transition segment (212) is equal to that of the second equal-section segment (213), and the cross-sectional area of the transition segment (212) gradually decreases from the first end to the second end thereof.
6. A bus-strip segment according to claim 3, characterized in that it comprises a first equal-section segment (211) and a second equal-section segment (213) directly connected, the cross-sectional area of the first equal-section segment (211) being larger than the cross-sectional area of the second equal-section segment (213).
7. The busbar section according to claim 1, wherein the busbar section comprises a pair of variable cross-section sections, and wherein both of the variable cross-section sections of any pair of the variable cross-section sections are arranged in mirror symmetry.
8. The busbar section according to claim 7, wherein in any pair of the variable section sections, one end of the variable section close to a plane of symmetry is a first end, one end far away from the plane of symmetry is a second end, and the sectional area of the variable section is gradually increased or decreased from the first end to the second end;
or in any pair of the variable section sections, one end of the variable section, which is close to the symmetry plane, is a first end, one end of the variable section, which is far away from the symmetry plane, is a second end, and the sectional area of the variable section increases in a stepped manner or decreases in a stepped manner from the first end to the second end.
9. A bus bar tape wound in a roll form, wherein the bus bar tape has at least one section of the bus bar tape as claimed in any one of claims 1 to 9.
10. A photovoltaic module, comprising a busbar section (21) and a series of cells; the busbar section (21) comprises a head busbar section (33), a middle busbar section (34) and a tail busbar section (35); the battery string group comprises a first battery string group (31) and a second battery string group (32);
the first battery string group (31) and the second battery string group (32) are vertically symmetrical, and the first battery string group (31) and the second battery string group (32) both comprise a plurality of battery strings which are vertically arranged in parallel; the two ends of the first battery string group (31) are respectively connected with the head bus-bar belt section (33) and the middle bus-bar belt section (34), and the two ends of the second battery string group (32) are respectively connected with the middle bus-bar belt section (34) and the tail bus-bar belt section (35); the head bus strip section (33) and the tail bus strip section (35) are identical in structure and symmetrical to each other;
the middle bus bar strip section (34) comprises three bus bar strip sections (21), wherein an outgoing line connector (341) is arranged between two adjacent bus bar strip sections (21); the outgoing line connector (341) is connected with the junction box and used for supplying power to the outside; the cross-sectional area of the bus bar segment (21) of the middle bus bar segment (34) near the outgoing line connector (341) is relatively large to collect relatively more current; the cross-sectional area of the portion of the bus bar segment (21) of the middle bus bar segment (34) away from the outgoing line connector (341) is relatively small to collect relatively small current.
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| CN202211104648.4A CN115579413A (en) | 2021-07-29 | 2021-07-29 | Converge area, converge area section and photovoltaic module |
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| CN202110862204.6A CN113594280B (en) | 2021-07-29 | 2021-07-29 | Bus bar, bus bar segment, preparation method of bus bar segment, photovoltaic module and production equipment of photovoltaic module |
| CN202211104648.4A CN115579413A (en) | 2021-07-29 | 2021-07-29 | Converge area, converge area section and photovoltaic module |
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| DE19707427A1 (en) * | 1997-02-25 | 1998-08-27 | Kampf Gmbh & Co Maschf | Device for pulling a material web, in particular a film, into a processing machine |
| JP2013041888A (en) * | 2011-08-11 | 2013-02-28 | Alpha- Design Kk | Apparatus and method for assembling solar battery cell, and program |
| CN202394985U (en) * | 2011-12-22 | 2012-08-22 | 江苏万丰光伏有限公司 | Structure of solder strip of solar cell panel |
| CN104485365B (en) * | 2014-12-24 | 2017-01-25 | 无锡尚德太阳能电力有限公司 | Compound type embossing photovoltaic welding strip and machining method thereof |
| CN205864366U (en) * | 2016-08-08 | 2017-01-04 | 浙江晶科能源有限公司 | A kind of photovoltaic module and convergent belt thereof |
| CN107052636B (en) * | 2017-04-24 | 2019-03-12 | 无锡奥特维科技股份有限公司 | Solder strip traction device and method |
| CN109301035B (en) * | 2018-10-29 | 2023-09-29 | 宁夏小牛自动化设备股份有限公司 | Half-sheet assembly three-wire-outlet layout welding strip and bus strip interconnection welding equipment and interconnection welding method |
| CN211208465U (en) * | 2020-01-09 | 2020-08-07 | 南通美能得新能源科技股份有限公司 | High-reliability slicing photovoltaic module |
| CN113113505A (en) * | 2020-01-09 | 2021-07-13 | 南通美能得新能源科技股份有限公司 | Slicing solar assembly |
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