CN214068739U - Laminated photovoltaic module with directly parallel-connected battery strings - Google Patents
Laminated photovoltaic module with directly parallel-connected battery strings Download PDFInfo
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- CN214068739U CN214068739U CN202120152549.8U CN202120152549U CN214068739U CN 214068739 U CN214068739 U CN 214068739U CN 202120152549 U CN202120152549 U CN 202120152549U CN 214068739 U CN214068739 U CN 214068739U
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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
Abstract
The utility model relates to a laminated photovoltaic module with directly parallel connected battery strings, which comprises a frame, wherein the frame is sequentially provided with coated toughened glass, upper EVA (ethylene vinyl acetate), a battery pack, a lower EVA and a back plate from top to bottom; the battery pack includes a plurality of battery strings coupled in parallel; each battery string comprises a plurality of battery pieces which are connected in series; welding strips are directly welded on the front main grids of the head battery pieces of the battery strings, and welding strips are directly welded on the back main grids of the tail battery pieces of the battery strings; the welding strips on the head battery pieces of the adjacent battery strings form electric connection through welding, and the welding strips on the tail battery pieces of the adjacent battery strings form electric connection through welding. The utility model discloses a direct welding that welds the area on the battery cluster comes to realize the parallelly connected between the battery cluster, has consequently effectively reduced the use amount that welds the area, and the corresponding resistance power loss that has reduced the transmission of electric charge and has sent on welding the area. Meanwhile, the welding frequency is greatly reduced, and the yield is effectively improved.
Description
Technical Field
The utility model relates to a photovoltaic module, in particular to direct parallelly connected shingled photovoltaic module of battery cluster.
Background
With the environmental pollution problem caused by coal power generation, the development and utilization of renewable energy technology become the main subject of research in the new energy field at present. Because solar energy has the advantages of cleanness, environmental protection, no regional limitation, inexhaustibility and the like, the research on various high-efficiency solar power generation technologies becomes a research hotspot of various global large photovoltaic enterprises, universities and research institutes. With the continuous development of photovoltaic technology, crystalline silicon photovoltaic technology exclusively occupies the great role by virtue of the unique stability advantage and occupies important new energy market share.
With the deep development of photovoltaic technology, increasing the output power density of the module becomes an important point of industrial research. The shingled photovoltaic module divides the cell slice into the cell strips with smaller areas by slicing the conventional cell strips through the unique structural design of the shingled photovoltaic module. The current of the battery strip is positively correlated with the light receiving area, and the voltage is related with the inherent crystal structure and the manufacturing process of the crystalline silicon material and is generally a fixed value, so that the battery strip after laser cutting has the characteristics of keeping the voltage unchanged and reducing the current compared with the conventional uncut battery piece. After the battery bars are prepared into the battery strings, the power loss relationship is as follows:
Ploss of power＝I2Rs
I-Current of the Battery string
Rs-series resistance of battery string
From the above power loss relationship it can be deduced that: the battery string formed by the battery strips after laser cutting has lower power consumption.
The conventional laminated photovoltaic module is characterized in that a bus bar is additionally arranged to lead out a hole carrier and an electron carrier of a battery string, an additional welding process and the bus bar are required to be added, not only is the process complexity increased, but also the resistance power loss caused by the long length of the bus bar is increased, and the local stress concentration effect of a main grid electrode welding area of the battery bar is increased due to multiple times of welding in the conventional laminated photovoltaic module parallel connection structure, so that the reject ratio of a module product and the power attenuation and failure risk of outdoor operation of the module are increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a direct parallelly connected shingled photovoltaic module of battery cluster, it compares in traditional shingled photovoltaic module welding mode, the welding number of times among this technical scheme significantly reduces, thereby reduced the local stress concentration effect of battery strip main grid electrode weld zone, reduced because of the microcrack of welding department, especially photovoltaic module needs to operate 25 years in the open air, the resistance of welding department can be increased because of the stress concentration effect that high temperature welding leads to, not only consume the power that photovoltaic module produced, and lead to local heating easily, lead to the melting of welding department because of the continuous increase of heat even, increase photovoltaic module's inefficacy risk; meanwhile, because the short length of the welding strip is adopted in the technical scheme, the power loss caused by the resistance of the welding strip is correspondingly reduced.
Realize the utility model discloses the technical scheme of purpose is: the utility model comprises a frame, wherein the frame is sequentially provided with a film-coated toughened glass, an upper EVA (ethylene vinyl acetate copolymer), a battery pack, a lower EVA and a back plate from top to bottom; the battery pack includes a plurality of battery strings coupled in parallel; each battery string comprises a plurality of battery strips connected in series; welding strips are directly welded on the front main grid electrode of the head battery strip of each battery string, and welding strips are directly welded on the back main grid electrode of the tail battery strip of each battery string; the welding strips on the head battery strips of the adjacent battery strings form the output end of the photon-generated carrier through welding, and the welding strips on the tail battery strips of the adjacent battery strings form the output end of the photon-generated carrier through welding.
The welding strip is directly welded on the front main gate electrode of the head battery strip of the battery string, and the welding strip is directly welded on the back main gate electrode of the tail battery strip of the battery string; the adjacent battery strings are respectively connected in parallel between the main grid electrodes of the head battery strip and the tail battery strip through the mutual lap joint and high-temperature welding of welding strips, wherein the welding strips welded on the main grid electrodes of the head battery strip and the main grid electrodes are used as negative electrode equipotential output ends connected in parallel, and the welding strips welded on the main grid electrodes of the tail battery strip and the main grid electrodes are used as positive electrode equipotential output ends.
The front side main grid electrode of the previous battery strip is electrically connected with the back side main grid electrode of the next battery strip in series through a conductive medium.
The conductive medium is conductive adhesive.
The welding strip is a bus bar or an interconnection bar or a round wire welding strip.
One end of the welding strip exceeds the battery strip to form a region to be welded, and the other end of the welding strip is retracted into the battery strip; after the corresponding welding strips on the adjacent battery strings are welded and connected, the area to be welded of the previous welding strip and one end, retracted into the battery strip, of the next welding strip are connected to form an electric connection, and a whole is formed.
The solder strip is provided with a plurality of stress reducing notches arranged along the extending direction of the solder strip.
The number of the stress reducing notches is 1-20.
The stress reducing notch comprises a straight groove and an arc-shaped groove which are communicated into a whole; the arc-shaped groove is the bottom of the stress reducing notch.
The utility model discloses has positive effect: (1) the utility model discloses a direct welding solder strip on the front main grid electrode of first battery strip and the back main grid electrode of tail battery strip, parallelly connected welding strip through the welding strip wait weld on district's direct overlap joint and high temperature welding main grid electrode or the main grid electrode on adjacent battery cluster first battery strip and the tail battery strip welded the solder strip, compare in traditional shingled photovoltaic module's welding mode, the utility model discloses modified welding mode makes the welding number of times reduce 50%, has also correspondingly reduced because of the high temperature welding stress concentration effect that welding between solder strip and the battery strip main grid electrode brought, has reduced the battery strip because of local stress concentrates defects such as crazing line that cause to the power attenuation problem that the outdoor long-term operation of shingled photovoltaic module brought has been reduced.
(2) The utility model discloses modified welding mode adopts and welds the area lug weld on the main grid electrode of battery strip, and is realizing being connected main grid electrode and busbar through the interconnection strip with the main grid electrode among the conventional welding process of shingled photovoltaic module, and the photocarrier that output shingled photovoltaic module produced, consequently the utility model discloses modified welding mode has reduced the use amount that welds the area, and the corresponding resistance power loss that causes because of the transmission of photocarrier in welding the area that has reduced.
(3) The utility model discloses well one end of welding the area surpasss the battery strip, and the other end is indented in the battery strip, can let adjacent battery cluster form a whole after welding the area welding hookup.
(4) The utility model discloses can release the concentrated stress that the welding caused with the stress-reducing breach to reduce the battery strip that welding stress caused and hidden the splitting, local microdefect scheduling problem.
(5) The utility model discloses a plurality of stress-reducing gaps of arranging along the extending direction of welding strip can further improve the release effect of stress.
Drawings
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is given in conjunction with the accompanying drawings, in which
Fig. 1 is a cell string of a conventional shingled photovoltaic module;
FIG. 2 is a schematic diagram of a series-parallel connection of cells in a conventional shingled photovoltaic module;
FIG. 3 is a schematic structural view of the present invention;
fig. 4 is a schematic structural diagram of a battery string according to the present invention;
FIG. 5 is a schematic diagram of the series-parallel connection of the batteries according to the present invention;
FIG. 6 is a schematic structural view of the to-be-welded region of the middle solder strip of the present invention directly welded to the main grid electrode;
fig. 7 is a schematic view of the overall structure of the present invention;
FIG. 8 is an enlarged view taken at A in FIG. 7;
fig. 9 is a schematic structural view of the middle solder strip of the present invention.
Detailed Description
As shown in fig. 1, which is a schematic diagram of a cell string structure of a conventional shingled photovoltaic module, cell strips forming a cell string 1a are connected in series by shingled connection, and a specific implementation manner includes:
s1: printing main grid electrodes on the side positions of the front side and the back side of the battery strip respectively;
s2: dispensing conductive adhesive on the main gate electrode in the step S1 in a dispensing manner;
s3: the positive electrodes and the negative main grid electrodes of the adjacent battery strips are overlapped to form a battery string connected in series;
s4: the head battery strip and the tail battery strip of the battery string respectively transmit the photo-generated electrons and the photo-generated holes to the interconnection strip 2a, and then the photo-generated electrons and the photo-generated holes are transmitted to the bus bar 3a through the interconnection strip 2 a.
The cell strip used in the conventional shingled photovoltaic module shown in fig. 1 was prepared by laser cutting a cell strip printed with 6 main gate electrodes. The head battery strip and the tail battery strip of the battery string are directly welded with the interconnection strip 2a through the main grid electrode, 12 times of welding is needed, excessive high-temperature welding easily causes stress concentration of the head or the tail battery strip in the battery string 1a to cause local micro deformation of the battery strip, and product defects such as cracking and hidden cracking are easily caused in the subsequent lamination process. The interconnection bar 2a and the bus bar 3a are welded to realize transmission of photo-generated carriers, 12 times of welding are needed, local high-temperature welding easily causes local stress concentration of the welding strips, and particularly when the photovoltaic module runs outdoors for many years, cracking of the welding points and resistance increase of the welding points are easily caused, so that the photovoltaic module becomes one of the reasons of power attenuation and even failure of the photovoltaic module.
Fig. 3 shows the structural schematic diagram of the photovoltaic module of the present invention, which includes a frame 1, a coated toughened glass 2, an upper EVA3, a lower EVA5, a battery pack 4 and a back plate 6, wherein the battery pack 4 is a laminated photovoltaic module.
Fig. 4 shows that the utility model discloses a battery cluster structural diagram, battery strip pass through conducting resin and realize the shingled formula series connection between the adjacent battery strip, weld on the avris main gate electrode of taking 7 beading on the head of battery cluster 41 and the tail battery strip, transmit the photogenerated carrier that battery cluster 41 produced to weld on taking 7.
One end of the welding strip 7 exceeds the battery strip, and the other end of the welding strip is retracted into the battery strip; after the corresponding welding strips 7 on the adjacent battery strings 41 are welded and connected, the end of the previous welding strip 7 beyond the battery strip is connected with the end of the next welding strip 7 retracted into the battery strip to form an electric connection, and an integral body is formed.
The solder strip 7 is provided with four stress-relief notches 72 arranged along the extension direction thereof.
The stress reducing notch 72 comprises a straight groove and an arc-shaped groove which are communicated into a whole; the arc-shaped groove is the bottom of the stress reducing notch. The stress-reducing notch 72 extends in the width direction of the solder fillet 7.
The welding strip 7 is directly welded to the main grid electrode of the head battery strip or the tail battery strip of the battery string 41, so that adverse effects caused by welding stress concentration can be reduced. After the main gate electrode of the welding strip 7 is welded, a section of area to be welded 71 needs to be reserved for welding in parallel with the main gate electrode of the adjacent battery string. The areas to be welded 71 of the solder ribbon 7 shown in fig. 3 are directly soldered to the solder ribbons of the adjacent cell strings; fig. 7 shows that the regions to be welded 71 are welded directly to the side main gate electrode of the head or tail strip of the adjacent cell string 41.
Fig. 5 is the structural schematic diagram that adjacent battery cluster is directly parallelly connected, combines the cross-sectional schematic diagram of group battery 4 shown in fig. 3, realizes the utility model discloses the process steps of the direct parallelly connected electric connection mode of adjacent battery cluster are:
s1: dotting conductive adhesive on the main grid electrode at the side of the battery strip after laser cutting to prepare a battery string 41 in which adjacent battery strips are connected in series;
s2: welding strips are welded on main grid electrodes of a head battery strip and a tail battery strip of the battery string 41 and used for outputting photon-generated carriers generated by the battery string to prepare a single battery string 41 with a photon-generated carrier output end;
s3: and overlapping the solder strips of the battery strings 41 to the adjacent battery strings to realize the parallel connection between the adjacent battery strings, and preparing the battery pack 4 for packaging the shingled photovoltaic module.
The solder strip structure in the above process steps is determined according to the actual output current of the battery string, and when the overall output current of the battery string is large, a solder strip with a large cross-sectional area, i.e. a bus bar, can be selected, and when the overall output current of the battery string is small, a solder strip with a small cross-sectional area, i.e. an interconnection bar, can be selected.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A laminated photovoltaic module with batteries connected in series and parallel directly comprises a frame (1), wherein the frame (1) is sequentially provided with coated toughened glass (2), an upper EVA (3), a battery pack (4), a lower EVA (5) and a back plate (6) from top to bottom; the method is characterized in that: the battery pack (4) includes a plurality of battery strings (41) coupled in parallel; each battery string (41) comprises a plurality of battery bars connected in series; the welding strip (7) is directly welded on the front main grid electrode of the head battery strip of each battery string (41), and the welding strip (7) is directly welded on the back main grid electrode of the tail battery strip of each battery string (41); the welding strips (7) on the head battery strips of the adjacent battery strings (41) form the output ends of the photon-generated carriers through welding, and the welding strips (7) on the tail battery strips of the adjacent battery strings (41) form the output ends of the photon-generated carriers through welding.
2. The direct-parallel-cell string-connected shingled photovoltaic module according to claim 1, wherein: the front side main grid electrode of the previous battery strip is electrically connected with the back side main grid electrode of the next battery strip in series through a conductive medium.
3. The direct-parallel-cell string-connected shingled photovoltaic module according to claim 2, wherein: the conductive medium is conductive adhesive.
4. A shingled photovoltaic module having a series of cells connected in parallel directly according to claim 1, 2 or 3 wherein: the welding strip (7) is a bus bar or an interconnection bar or a round wire welding strip.
5. The direct-parallel-cell string-connected shingled photovoltaic module according to claim 4, wherein: one end of the welding strip (7) exceeds the battery strip to form a region to be welded (71), and the other end of the welding strip is retracted into the battery strip; after the corresponding welding strips (7) on the adjacent battery strings (41) are welded and connected, the to-be-welded area (71) of the previous welding strip (7) and one end, retracted into the battery strip, of the next welding strip (7) are connected to form an electric connection and form a whole.
6. The direct-parallel-cell string-connected shingled photovoltaic module according to claim 1, wherein: the welding strip (7) is provided with a plurality of stress reducing notches (72) which are arranged along the extending direction of the welding strip.
7. The direct-parallel-cell string-connected shingled photovoltaic module according to claim 1, wherein: the number of the stress reducing notches (72) is 1-20.
8. The direct-parallel-cell string-connected shingled photovoltaic module according to claim 6, wherein: the stress reducing notch (72) comprises a straight groove and an arc-shaped groove which are communicated into a whole; the arc-shaped groove is the bottom of the stress reducing notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120152549.8U CN214068739U (en) | 2021-01-20 | 2021-01-20 | Laminated photovoltaic module with directly parallel-connected battery strings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120152549.8U CN214068739U (en) | 2021-01-20 | 2021-01-20 | Laminated photovoltaic module with directly parallel-connected battery strings |
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| CN214068739U true CN214068739U (en) | 2021-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114464704A (en) * | 2022-01-29 | 2022-05-10 | 环晟新能源(江苏)有限公司 | Production process of laminated tile assembly |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114464704A (en) * | 2022-01-29 | 2022-05-10 | 环晟新能源(江苏)有限公司 | Production process of laminated tile assembly |
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