CN112614908B - Photovoltaic module and preparation method thereof - Google Patents
Photovoltaic module and preparation method thereof Download PDFInfo
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- CN112614908B CN112614908B CN201911228852.5A CN201911228852A CN112614908B CN 112614908 B CN112614908 B CN 112614908B CN 201911228852 A CN201911228852 A CN 201911228852A CN 112614908 B CN112614908 B CN 112614908B
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 19
- 239000004020 conductor Substances 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
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- 230000008901 benefit Effects 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000004458 analytical method Methods 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
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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
- H01L31/044—PV modules or arrays of single PV cells including bypass diodes
- H01L31/0443—PV modules or arrays of single PV cells including bypass diodes comprising bypass diodes integrated or directly associated with the devices, e.g. bypass diodes integrated or formed in or on the same substrate as the photovoltaic cells
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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 invention discloses a photovoltaic module and a preparation method thereof. In the same cell unit group in the photovoltaic module, a first connecting point of two first cell strings connected in series is electrically connected with a second connecting point of two second cell strings connected in series through a jumper wire, the jumper wire comprises a first sub-part and a second sub-part which are connected with each other, and the first cell string and the second cell string which have any common end point are respectively connected with the same diode in a reverse parallel mode through different sub-parts of the jumper wire; the battery piece is a half battery piece formed by cutting a whole battery piece; the two diodes corresponding to each battery unit group are arranged in the same junction box. According to the technical scheme provided by the embodiment of the invention, on the premise of ensuring that the diode is not broken down, the number of the cells in each cell string is increased, so that the problem that the diode is broken down reversely easily when the number of the cells in the photovoltaic module is increased is solved.
Description
Technical Field
The embodiment of the invention relates to the field of photovoltaic power generation, in particular to a photovoltaic module and a preparation method thereof.
Background
With the continuous development of photovoltaic power generation technology, photovoltaic modules are gradually applied to various fields of social life and are favored by users.
Fig. 1 is a schematic circuit diagram of a photovoltaic module in the prior art. As shown in fig. 1, a photovoltaic module in the prior art includes 12 cell strings 1, where each two cell strings 1 form a series structure 2, each two series structures 2 form a parallel structure 3, and the parallel structures 3 are connected in series. Further, every two series structures 2 forming the parallel structure 3 are reversely connected with the same diode 4 in parallel, and the number of the battery pieces 5 protected by each diode 4 is the number of the battery pieces 5 in the series structures 2, namely the number of the total battery pieces 5 in the two battery strings 1, so that the number of the battery pieces 5 in the battery strings 1 is limited by the reverse voltage-resisting capacity of the diode 4, the number of the total battery pieces 5 in the photovoltaic module cannot be increased, and the performance improvement of the photovoltaic module is affected.
Disclosure of Invention
The invention provides a photovoltaic module and a preparation method thereof, which are used for increasing the number of cells in the photovoltaic module on the premise of ensuring that a diode cannot be reversely punctured, so that the performance of the photovoltaic module is improved.
In a first aspect, an embodiment of the present invention provides a photovoltaic module, including at least one cell unit, where the cell unit includes a first cell unit and a second cell unit connected in parallel;
the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series;
the first battery string and the second battery string respectively comprise a plurality of battery slices which are connected in series and are equal in number;
in the same battery cell group, a first connection point of two first battery strings connected in series is electrically connected with a second connection point of two second battery strings connected in series through a jumper wire, the jumper wire comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have any common end point are respectively connected with the same diode in an inverse parallel mode through different sub-parts of the jumper wire;
the battery piece is a half battery piece formed by cutting a whole battery piece;
the two diodes corresponding to each battery unit group are arranged in the same junction box.
In a second aspect, an embodiment of the present invention further provides a method for manufacturing a photovoltaic module, including:
forming a main circuit of the photovoltaic module, the main circuit comprising at least one cell group; the battery cell group comprises a first battery cell and a second battery cell which are connected in parallel; the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series; the first battery string and the second battery string respectively comprise a plurality of battery pieces which are connected in series and are equal in number, wherein the battery pieces are half battery pieces formed by cutting a whole battery piece;
forming at least one jumper wire electrically connecting first connection points of two series-connected first battery strings and second connection points of two series-connected second battery strings in the battery cell group; the jumper comprises a first sub-part and a second sub-part which are connected with each other;
electrically connecting a plurality of diodes to the main circuit and the jumper wire, each of the diodes being connected in anti-parallel with any one of the first battery string and the second battery string having a common terminal through different sub-sections of the jumper wire, respectively; and the two diodes corresponding to each battery cell group are arranged in the same junction box.
The technical scheme provided by the embodiment of the invention is that a jumper wire is electrically connected between the first connecting points of two first battery strings connected in series and the second connecting points of two second battery strings connected in series in each battery unit group, wherein the jumper comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have any common terminal are reversely connected in parallel with the same diode through different sub-parts of the jumper, the diodes are connected in parallel with only one first battery string and one second battery string, and compared with the prior art in which each diode is connected in parallel with two first battery strings and two second battery strings, the number of battery strings connected in parallel with the diodes is reduced, on the premise of ensuring that the diode is not broken down, the number of the cells in each cell string is increased, and the problem that the diode is broken down reversely when the number of the cells in the photovoltaic module is increased is solved. In addition, compared with the photovoltaic module with the same number of cells in the prior art, the photovoltaic module provided by the embodiment of the invention has the advantages that the number of single strings of cells in reverse parallel connection of each diode is less, and the hot spot temperature is lower.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic circuit diagram of a photovoltaic module according to the prior art;
FIG. 2 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the photovoltaic module of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken along the dashed line AB of FIG. 3;
fig. 5 is a schematic cross-sectional structural diagram of a jumper according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present invention.
Description of the reference numerals
1-a battery string;
2-a series structure;
3-a parallel configuration;
4-a diode;
5-a battery piece;
100-cell stack;
110-a first battery cell;
120-a second battery cell;
101-a first battery string;
102-a second battery string;
201-battery piece;
300-jumper wire;
310-the first sub-section;
320-the second subsection;
200-a diode;
o-a first connection point;
p-second attachment point;
400-an insulating layer;
a 600-L-shaped outgoing line;
601-first side;
602-a second edge;
500-a central bus bar;
501-a partition area;
111-a first battery cell;
112-b first battery cell;
113-c first battery cell;
121-a second battery cell;
122-b second battery cell;
123-C second battery unit;
700-edge bus bar;
10-a cell array;
301-center conductor;
302-peripheral insulating layer.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of a photovoltaic module and a method for manufacturing the same according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides a photovoltaic module, which comprises at least one battery cell group, wherein the battery cell group comprises a first battery cell and a second battery cell which are connected in parallel;
the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series;
the first battery string and the second battery string both comprise a plurality of battery pieces which are connected in series and are equal in number;
in the same battery cell group, a first connection point of the two first battery strings connected in series and a second connection point of the two second battery strings connected in series are electrically connected through a jumper wire, the jumper wire comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have any common endpoints are respectively connected with the same diode in reverse parallel through different sub-parts of the jumper wire;
the battery piece is a half battery piece formed by cutting a whole battery piece;
the two diodes corresponding to each battery unit group are arranged in the same junction box.
The technical scheme provided by the embodiment of the invention is that a jumper wire is electrically connected between the first connecting points of two first battery strings connected in series and the second connecting points of two second battery strings connected in series in each battery unit group, wherein the jumper comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have any common terminal are reversely connected in parallel with the same diode through different sub-parts of the jumper, the diodes are connected in parallel with only one first battery string and one second battery string, and compared with the prior art in which each diode is connected in parallel with two first battery strings and two second battery strings, the number of battery strings connected in parallel with the diodes is reduced, on the premise of ensuring that the diode is not broken down, the number of the cells in each cell string is increased, and the problem that the diode is broken down reversely when the number of the cells in the photovoltaic module is increased is solved.
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. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments of the present invention without any creative work, belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and it will be recognized by those skilled in the art that the present invention may be practiced without these specific details.
Next, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the structure of the device are not enlarged partially according to the general scale for convenience of description, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
Fig. 2 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention. As shown in fig. 2, the photovoltaic module includes at least one cell stack 100, the cell stack 100 includes a first battery cell 110 and a second battery cell 120 connected in parallel, the first battery cell 110 includes two first battery strings 101 connected in series, the second battery cell 120 includes two second battery strings 102 connected in series, and each of the first battery strings 101 and the second battery strings 102 includes a plurality of battery sheets 201 connected in series and equal in number. In the same battery cell group 100, a first connection point O of two first battery strings 101 connected in series and a second connection point P of two second battery strings 102 connected in series are electrically connected through a jumper 300, the jumper 300 includes a first sub-part 310 and a second sub-part 320 connected with each other, the first battery string 101 and the second battery string 102 arbitrarily having a common endpoint are respectively connected in reverse parallel with the same diode 200 through different sub-parts of the jumper 300, wherein the battery cell 201 is a half-cell cut from a whole battery cell, and two diodes 200 corresponding to each battery cell group 100 are disposed in the same junction box.
The diode 200 can prevent a hot spot effect from being generated when the first battery unit 110 or the second battery unit 120 connected in parallel with the diode is shielded. In addition, the reason why the first battery cell 110 and the second battery cell 120 in each battery cell group 100 are connected in parallel is that: when all the cells 201 are connected in series, the output voltage at two ends of the photovoltaic module is larger, and the arrangement can reduce the output voltage of the photovoltaic module by half.
It should be noted that the jumper 300 is used to electrically connect the first connection point O and the second connection point P, and is insulated from other conductive structures. The insulating manner of the jumper 300 and other conductive structures is not particularly limited in this embodiment, and for example, an insulating layer may be disposed between the jumper 300 and other conductive structures, or the jumper 300 includes a peripheral insulating layer.
In the present embodiment, the first sub-portion 310 and the second sub-portion 320 of the jumper 300 may be an integrally formed structure, or may be a separate structure, and preferably, both are integrally formed for easy manufacturing.
In addition, the arrangement that each battery cell group 100 corresponds to two diodes 200 arranged in the same junction box is beneficial to simplifying the structure of the photovoltaic module. It is understood that two diodes 200 corresponding to each battery cell group 100 may be respectively disposed in one junction box, or all diodes 200 corresponding to each battery cell group 100 may be disposed in the same junction box, which is not particularly limited in this embodiment.
In the solution provided in this embodiment, a jumper 300 is electrically connected between the first connection point O of two first battery cells 110 connected in series and the second connection point P of two second battery cells 120 connected in series in each battery cell group 100, wherein the jumper 300 includes a first sub-part 310 and a second sub-part 320 connected with each other, and the first battery cell 110 and the second battery cell 120 having any common terminal are connected in parallel with the same diode 200 in an inverse direction through different sub-parts of the jumper 300, so that the diode 200 is connected in parallel with only one first battery cell 110 and one second battery cell 120, compared with the prior art in which each diode 200 is connected in parallel with two first battery cells 110 and two second battery cells 120, the number of battery strings connected in parallel with the diode 200 is reduced, and the number of battery sheets 201 in each battery string is increased on the premise that the diode 200 is not broken down, and further, the problem that the diode 200 is subjected to reverse breakdown easily caused by increasing the number of the cell sheets 210 in the photovoltaic module is avoided.
Further, with continued reference to fig. 2, the number of at least one cell stack 100 is three, and adjacent cell stacks 100 are connected in series.
It should be noted that, the photovoltaic resistor structure shown in fig. 2 adopts the conventional width of the photovoltaic module in the prior art, that is, the width of 6 battery strings, so that the characteristic size of the photovoltaic module is not significantly increased, the layout is convenient, and the increase of the design difficulty is avoided.
It should be understood that, in other embodiments of the present embodiment, the adjacent battery cell groups 100 may be connected in parallel, which is not specifically limited in the present embodiment, and only the adjacent battery cell groups 100 are connected in series as an example.
Optionally, the number of the battery slices 201 in the first battery string 101 and the second battery string 102 is greater than or equal to 12.
It should be noted that, the conventional diode is limited by its reverse voltage withstanding capability, and the number of cells that can be protected at most does not exceed 24, and for the photovoltaic module in the prior art shown in fig. 1, the reverse voltage of each diode is equal to the total voltage of two series strings of cells connected in parallel, so the number of cells in each string is at most 12, and the number of cells in the photovoltaic module shown in fig. 1 is at most 144. In the photovoltaic module provided in this embodiment, the reverse voltage of each diode is equal to the voltage of one cell string, and the number of the cells in each cell string may be at most 24, that is, compared with the scheme in which the number of the cells in the cell string is at most 12 in fig. 1, the number of the cells in each cell string in the photovoltaic module provided in this embodiment may be increased by one time, and further, when the number of the cell strings is equal, the total number of the cells in the photovoltaic module may be increased by one time. Based on the above analysis, the number of the cells in the first cell string and the second cell string is set to be greater than the maximum number of the cells that the cell string in the prior art can contain, that is, 12 cells, so as to increase the number of the cells in the photovoltaic module on the premise of ensuring the normal operation of the photovoltaic module, and obtain better device performance compared with the prior art. And the number of the battery pieces in the first battery string and the second battery string can be equal to the maximum number of the battery pieces which can be contained in the battery string in the prior art, namely 12 battery pieces, at the moment, the number of the battery pieces which are connected in parallel with each diode is far smaller than the number of the battery pieces which can be loaded at the maximum, and compared with the prior art in which the diode needs to adopt the maximum reverse voltage-resistant load-bearing 12 battery pieces, the probability of reverse breakdown of the diode is effectively reduced due to the performance fluctuation of the diode caused by the influence of process errors in the technical scheme provided by the embodiment.
Fig. 3 is a schematic diagram of the structure of the photovoltaic module of fig. 2. As shown in fig. 3, all the cells 201 in the photovoltaic module are arranged in N rows and M columns, the extending direction of the cell rows is a first direction X, the extending direction of the cell columns is a second direction Y, and the jumper 300 extends along the second direction Y, where N and M are even numbers. N/2 battery pieces 201 in the 1 st row to the N/2 nd row in each battery piece column are sequentially connected in series to form a first battery string 101, and N/2 battery pieces 201 in the N/2+1 st row to the N nd row are sequentially connected in series to form a second battery string 102. Two first battery strings 101 respectively positioned in the nth column and the (n + 1) th column are connected in series to form a first battery unit 110, and two second battery strings 102 respectively positioned in the nth column and the (n + 1) th column are connected in series to form a second battery unit 120, wherein n is 2p +1, p is a non-negative integer, and n is less than M. The first battery cell 110 and the second battery cell 120 arranged in the second direction Y are connected in parallel as the battery cell group.
Specifically, in FIG. 3, N is equal to 24 and M is equal to 6. With continued reference to fig. 3, the two first battery strings 101 located in the 1 st and 2 nd columns are serially connected as a first battery unit 111, the two first battery strings 101 located in the 3 rd and 4 th columns are serially connected as a second first battery unit 112, and the two first battery strings 101 located in the 5 th and 6 th columns are serially connected as a third first battery unit 113. The two second battery strings 102 in the 1 st and 2 nd columns are connected in series to form a second battery unit 121, the two second battery strings 102 in the 3 rd and 4 th columns are connected in series to form a second battery unit 122, and the two second battery strings 102 in the 5 th and 6 th columns are connected in series to form a third battery unit 123. The first and second battery cells 111 and 121 are arranged in the second direction Y and are connected in parallel to form a battery cell group. Similarly, the first battery cell b 112 and the second battery cell b 122 are connected in parallel to form a battery cell group, and the first battery cell c 113 and the second battery cell c 123 are connected in parallel to form a battery cell group. Optionally, the three battery cell groups are connected in series.
It should be noted that, in fig. 3, only N is equal to 24 and M is equal to 6, which are taken as an example and not a limitation, and in other embodiments of this embodiment, N and M may be other even numbers.
It should be further noted that the structure of the photovoltaic module shown in fig. 3 enables all the cells 201 to be regularly and tightly arranged, which facilitates the electrical connection between the adjacent cells 201 on one hand, and facilitates the reduction of the occupied space of the whole photovoltaic module on the other hand.
Illustratively, as shown in fig. 3, the photovoltaic module further includes a center bus bar 500 along the first direction, the center bus bar 500 is disposed in the gap between the N/2 th row and the N/2+1 th row of the cell sheets 201, and the first cell unit 110 and the second cell unit 120 arranged along the second direction Y are connected in parallel to the center bus bar 500.
Optionally, the central bus bar 500 includes M/2 partition regions 501, the partition regions 501 are located between two common endpoints in the battery cell group, and one diode 200 is electrically connected between the endpoint of the two central bus bars 500 formed by the partition regions 501 and the jumper 300.
It should be noted that, in this embodiment, the central bus bar 500 is used to implement parallel connection between each first battery unit 110 and the corresponding second battery unit 120, which is beneficial to reducing the difficulty of design and process, and has a simple structure and a small influence on the normal operation of the photovoltaic module.
Optionally, referring to fig. 3, a connection point of the first sub-portion 310 and the second sub-portion 320 of the jumper 300 may be electrically connected to an L-shaped outgoing line 600, a first side 601 of the L-shaped outgoing line 600 is attached to the jumper 300, a second side 602 of the L-shaped outgoing line 600 is perpendicular to a plane where the cell array is located, the L-shaped outgoing lines 600 correspond to the partition regions 501 one by one, and two diodes 200 are electrically connected between end points of two central bus bars formed by the partition regions 501 and the second side 602 of the corresponding L-shaped outgoing line 600, respectively.
It should be noted that the L-shaped outgoing line 600 is a dielectric medium for electrically connecting the jumper 300 and the corresponding two diodes 200, and the setting process is simple and easy to implement, and the number of connecting lines can be reduced, which is beneficial to simplifying the structure of the photovoltaic module.
It should be noted that, the present embodiment is only described by taking the example that the jumper 300 and the two corresponding diodes 200 are electrically connected through the L-shaped outgoing line 600, and is not limited thereto, and any structure capable of electrically connecting the jumper 300 and the two corresponding diodes 200 is within the protection scope of the present embodiment.
With continued reference to fig. 3, the photovoltaic module may further include M edge-connecting bus bars 700, wherein ends of the two first cell strings 101, which are respectively located at the nth column and the (n + 1) th column, which are away from the central bus bar 500, are connected in series through the edge-connecting bus bars 700, and ends of the two second cell strings 102, which are respectively located at the nth column and the (n + 1) th column, which are away from the central bus bar 500, are connected in series through the edge-connecting bus bars 700.
It should be noted that the edge connection bus bar 700 can be disposed outside the cell array, and it does not intersect with the cell array, so that the normal operation of the photovoltaic module is not affected, and the overall occupied space of the cell array is not affected.
It should be noted that the edge connection bus bar 700, the center bus bar 500, and the jumper wire 300 can be formed in the same process step, thereby achieving the advantage of simplifying the process steps.
Fig. 4 is a schematic sectional view along the dashed line AB in fig. 3. As shown in fig. 4, in a direction Z perpendicular to a plane of the cell array, the jumper 300 partially overlaps the cell array 10, and an insulating layer 400 is disposed between the jumper 300 and the cell array 10 at least in an overlapping area.
It should be noted that the jumper 300 is generally a conductor formed by a conductive material, and when there is an overlap with the cell array 10, an interconnection bar (not shown) for achieving electrical connection between the cells is easy to overlap with the jumper 300, and if the two are in direct contact with each other, the electrical connection may be caused, thereby affecting the normal operation of the photovoltaic module. Therefore, an insulation layer 400 is disposed between the jumper line 300 and the battery cell array 10, and the insulation layer 400 is disposed at least in an overlapping region of the jumper line 300 and the interconnection bar (not shown) to ensure insulation. It is understood that, for the convenience of preparation, the insulating layer 400 may also be disposed in the surrounding area at the same time, as shown in fig. 4, which is not particularly limited in this embodiment, as long as the normal operation of the photovoltaic module is not affected.
Illustratively, the insulating layer 400 may be a light reflecting film.
It should be noted that the reflective film can also have other light reflection effects besides the insulating effect, which is beneficial to the improvement of the performance of the photovoltaic module device.
Illustratively, with continued reference to fig. 4, the difference between the width of the insulating layer 400 and the width of the jumper 300 is greater than or equal to 5mm in the row direction X of the cell matrix 10.
Referring to fig. 3, the length of the insulating layer 400 is greater than the length of the cell matrix and less than the distance between the first connection point O and the second connection point P in the column direction Y of the cell matrix.
It should be noted that, in order to avoid that the actual positions and the preset positions of the jumper wire 300 and the insulating layer 400 are deviated due to a process error, and thus the actual positions and the preset positions are misaligned, the width of the insulating layer 400 is set to be greater than the width of the jumper wire 300, and the width of the insulating layer 400 is set to be at least twice the displacement length of the process error greater than the width of the jumper wire 300, for example, the difference between the width of the insulating layer 400 and the width of the jumper wire 300 is set to be equal to or equal to 5mm according to a conventional process error.
Similarly, the length of the insulating layer 400 is set to be greater than the length of the battery cell array, and in order to prevent the insulating layer 400 from affecting the electrical connection between the jumper 300 and the first connection point O and the second connection point P, the length of the insulating layer 400 is set to be smaller than the length between the first connection point O and the second connection point P.
Further, the thinner the insulating layer 400 is, the better the insulating function can be achieved, so that the lamination crack can be avoided.
Illustratively, adjacent cells 201 in the cell string are electrically connected by an interconnection bar (not shown), and the jumper wire 300 does not overlap with the interconnection bar (not shown) in a direction perpendicular to a plane in which the cell array is located.
It should be noted that the formed interconnection bar (not shown) has a certain height, which is raised above the surface of the cell array, and in order to avoid the problem that the lamination of the jumper wire 300, the insulating layer 400 and the interconnection bar (not shown) further increases the local height, and thus the lamination split occurs, the jumper wire 300 is not overlapped with the interconnection bar (not shown).
Optionally, fig. 5 is a schematic cross-sectional structure diagram of a jumper wire according to an embodiment of the present invention. As shown in fig. 5, the jumper 300 may include a center conductor 301 and a peripheral insulation layer 302 wrapped around the outside of the center conductor 301.
It should be noted that when the jumper 300 with this structure is in contact with other lead structures, the peripheral insulating layer 302 can perform an insulating function, and an additional insulating layer is not required, which is beneficial to simplifying the structure and process of the photovoltaic module.
Illustratively, the thickness of the jumper 300 can range from 0.05 mm to 0.15mm, and the width of the jumper 300 can range from 1 mm to 5 mm.
It should be noted that, the overall thickness of the photovoltaic module is affected by the excessively large thickness of the jumper 300, the electrical performance of the jumper 300 is affected by the excessively small thickness of the jumper 300, and in addition, the occupied space is large due to the excessively wide width of the jumper 300, so that the probability that the jumper 300 is electrically connected with the cell matrix is increased, and the electrical performance connection characteristics of the jumper 300 and the first connection point and the second connection point may be affected by the excessively small width of the jumper 300, accordingly, the thickness range of the jumper 300 is preferably set to be 0.05-0.15 mm, and the width range of the jumper 300 is 1-5 mm.
It is worth noting that compared with the photovoltaic module in the prior art, in the photovoltaic module formed by adopting the technical scheme provided by the embodiment of the application, the number of the single-string battery pieces which are reversely connected in parallel with each diode is reduced, the total power consumption of all the battery pieces which are reversely connected in parallel with the diodes is reduced, when a single battery piece is shielded, the power of other battery pieces reacting on the battery piece is reduced, and the hot spot temperature of the photovoltaic module is further effectively reduced.
Fig. 6 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present invention. As shown in fig. 6, the preparation method of the photovoltaic module may specifically include the following steps:
step 11, forming a main circuit of the photovoltaic module, wherein the main circuit comprises at least one battery cell group; the battery unit group comprises a first battery unit and a second battery unit which are connected in parallel; the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series; first battery cluster and second battery cluster all include a plurality of series connection and the equal battery piece of quantity, and wherein, the battery piece is half battery piece that is formed by the cutting of whole battery piece.
Specifically, each battery piece is placed at a preset position on a transparent protective substrate, the battery pieces belonging to the same battery string are electrically connected by using an interconnection bar according to a preset connection relationship, and then series connection between the corresponding battery strings, parallel connection between the corresponding battery units and series connection between the corresponding battery unit groups are realized by using a bus bar.
According to the technical scheme provided by the embodiment, the main circuit is formed, and the jumper wire for connecting each first connection point and the corresponding second connection point in the main circuit is formed, wherein the jumper wire comprises the first sub-part and the second sub-part which are connected with each other, different sub-parts of the jumper wire are the first battery string and the second battery string which are randomly provided with the common endpoint, and the first battery string and the second battery string are reversely connected with the same diode in parallel, so that the diode is only connected with one first battery string and one second battery string in parallel.
It is worth noting that in the manufacturing method of the photovoltaic module provided by the embodiment, the structure of the main circuit is the same as that of a corresponding main circuit in the prior art, a mature main circuit structure can be used, redesign is not needed, and the beneficial effect of simplifying design is achieved. In addition, on the basis of the main circuit structure, the design that every two batteries which are connected in parallel and have a common end point are connected with the same diode in series-reverse parallel can be realized only by connecting one jumper, the structure is simple, and the process is easy to realize.
For example, forming the primary circuit of the photovoltaic module may include:
arranging all the battery pieces into N rows and M columns, adopting an interconnection strip to serially connect N/2 battery pieces which are respectively positioned on the 1 st row to the N/2 nd row in each battery piece column as a first battery string, and adopting an interconnection strip to serially connect N/2 battery pieces which are respectively positioned on the N/2+1 th row to the N th row in each battery piece column as a second battery string, wherein N is an even number.
Forming a central bus bar in a gap between an Nth/2 row and an Nth/2 +1 th row, wherein the extending direction of the central bus bar is the same as that of the cell rows, the central bus bar forms a partition area between an nth column and an N +1 th column, N is 2p +1, p is a non-negative integer, and N is less than M; and M/2 edge connecting bus bars are respectively formed on two opposite sides of the battery piece array along the extension direction of the battery piece array, and each edge bus bar corresponds to one first battery unit or one second battery unit.
The end parts, close to the central bus bar, of the central bus bar and the battery strings are connected through the interconnection bars, the end parts, far away from the central bus bar, of the bus bars and the battery strings are connected through the interconnection bars at the connection edges, so that one ends, far away from the central bus bar, of the two first battery strings respectively located on the nth row and the (n + 1) th row are connected in series through the edge connection bus bars, one ends, far away from the central bus bar, of the two second battery strings respectively located on the nth row and the (n + 1) th row are connected in series through the edge connection bus bars, and the first battery units and the second battery units are arranged in parallel along the extension direction of the battery piece rows.
On this basis, electrically connecting the plurality of diodes with the main circuit and the jumper may include: and the connection point of the first sub-part and the second sub-part of the jumper is electrically connected with an L-shaped outgoing line, the first edge of the L-shaped outgoing line is attached and connected with the jumper, and the second edge of the L-shaped outgoing line is vertical to the plane of the battery piece array. And a diode is electrically connected between the end points of the two central bus bars formed by the partition region and the second side of the L-shaped lead-out wire.
Optionally, in a direction perpendicular to a plane of the battery sheet array, the jumper partially overlaps with the battery sheet array, and before forming the at least one jumper, the method may further include: and forming an insulating layer on the battery piece array, wherein the insulating layer is at least formed in an overlapping area of the jumper wire and the battery piece array.
Or, the jumper comprises a central conductor and a peripheral insulating layer wrapping the outer side of the central conductor, and before forming at least one jumper, the method further comprises: and a peripheral insulating layer is wrapped outside the central lead to form a jumper.
It should be noted that, in this embodiment, only the insulating layer is disposed between the jumper and the cell matrix, and the structure of the jumper is set as that the outer side of the central conductor wraps the peripheral insulating layer, so as to describe the manner of insulating the jumper from the cell array, and any manner capable of insulating the jumper from the cell matrix is within the protection scope of this embodiment.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (16)
1. A photovoltaic module comprising at least one cell stack, characterized in that the cell stack comprises a first cell and a second cell connected in parallel;
the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series;
the first battery string and the second battery string both comprise a plurality of battery pieces which are connected in series and are equal in number;
in the same battery cell group, a first connection point of two first battery strings connected in series is electrically connected with a second connection point of two second battery strings connected in series through a jumper wire, the jumper wire comprises a first sub-part and a second sub-part which are connected with each other, and the first battery string and the second battery string which have any common end point are respectively connected with the same diode in an inverse parallel mode through different sub-parts of the jumper wire;
the battery piece is a half battery piece formed by cutting a whole battery piece;
the two diodes corresponding to each battery cell group are arranged in the same junction box;
all the cells in the photovoltaic module are arranged in N rows and M columns, the extending direction of the cell rows is a first direction, the extending direction of the cell columns is a second direction, the jumper wire extends along the second direction, wherein N and M are even numbers;
the N/2 battery pieces in the 1 st row to the N/2 nd row in each battery piece column are sequentially connected in series to form the first battery string, and the N/2 battery pieces in the N/2+1 st row to the N nd row are sequentially connected in series to form the second battery string; the two first battery strings respectively positioned in the nth column and the (n + 1) th column are connected in series to form the first battery unit, the two second battery strings respectively positioned in the nth column and the (n + 1) th column are connected in series to form the second battery unit, wherein n is 2p +1, p is a non-negative integer, and n is smaller than M;
the first battery unit and the second battery unit which are arranged along the second direction are connected in parallel to form the battery unit group;
the photovoltaic module further comprises a central bus bar extending along the first direction, the central bus bar being disposed in a gap between the cell pieces in the N/2 th row and the N/2+1 th row; the first battery cell and the second battery cell aligned in the second direction are connected in parallel to the center bus bar.
2. The photovoltaic module according to claim 1, wherein the number of the at least one cell group is three, and the adjacent cell groups are connected in series.
3. The photovoltaic module of claim 1, wherein the number of the cells in the first and second strings of cells is greater than or equal to 12.
4. The pv module of claim 1 wherein the center bus bar includes M/2 cutoff regions between two of the common ends of the cell stacks, one of the diodes electrically connected between each of the ends of the two center bus bars formed by the cutoff regions and the jumper.
5. The photovoltaic module according to claim 4, wherein a connection point of the first sub-portion and the second sub-portion of the jumper is electrically connected with an L-shaped outgoing line, a first edge of the L-shaped outgoing line is attached to the jumper, and a second edge of the L-shaped outgoing line is perpendicular to a plane of the cell array;
the L-shaped outgoing lines correspond to the partition areas one by one, and the diodes are electrically connected between the end points of the two central bus bars formed by the partition areas and the second edges corresponding to the L-shaped outgoing lines respectively.
6. The photovoltaic module of claim 1, further comprising M edge-connecting bus bars; the ends, far away from the central bus bar, of the two first battery strings respectively positioned in the nth row and the (n + 1) th row are connected in series through the edge connecting bus bar, and the ends, far away from the central bus bar, of the two second battery strings respectively positioned in the nth row and the (n + 1) th row are connected in series through the edge connecting bus bar.
7. The photovoltaic module according to claim 1, wherein the jumper wire partially overlaps the cell array in a direction perpendicular to a plane in which the cell array is located, and an insulating layer is provided between the jumper wire and the cell array in at least an overlapping region.
8. The photovoltaic module of claim 7 wherein the insulating layer is a reflective film.
9. The photovoltaic assembly of claim 7, wherein a difference between a width of the insulating layer and a width of the jumper wire in the first direction is greater than or equal to 5 mm.
10. The photovoltaic module of claim 7, wherein the insulating layer has a length along the second direction that is greater than a length of the array of cells and less than a distance between the first connection point and the second connection point.
11. The photovoltaic module of claim 7, wherein adjacent ones of the cells in the string are electrically connected by an interconnect strip; in the vertical direction of the plane of the battery plate array, the jumper wire is not overlapped with the interconnection strip.
12. The photovoltaic module of claim 1, wherein the jumper comprises a center conductor and a peripheral insulation layer wrapped around an outside of the center conductor.
13. A method for preparing a photovoltaic module, comprising:
forming a main circuit of the photovoltaic module, the main circuit comprising at least one cell group; the battery cell group comprises a first battery cell and a second battery cell which are connected in parallel; the first battery unit comprises two first battery strings connected in series, and the second battery unit comprises two second battery strings connected in series; the first battery string and the second battery string respectively comprise a plurality of battery pieces which are connected in series and are equal in number, wherein the battery pieces are half battery pieces formed by cutting a whole battery piece;
forming at least one jumper wire electrically connecting first connection points of two of the first battery strings connected in series and second connection points of two of the second battery strings connected in series in the battery cell group; the jumper comprises a first sub-part and a second sub-part which are connected with each other;
electrically connecting a plurality of diodes to the main circuit and the jumper wire, each of the diodes being connected in anti-parallel with any one of the first battery string and the second battery string having a common terminal through different sub-sections of the jumper wire, respectively; the two diodes corresponding to each battery cell group are arranged in the same junction box;
the main circuit forming the photovoltaic module comprises:
arranging all the battery pieces into N rows and M columns, adopting N/2 battery pieces which are connected in series with each battery piece column and are respectively positioned on the 1 st row to the N/2 nd row as the first battery string, and adopting N/2 battery pieces which are connected in series with each battery piece column and are respectively positioned on the N/2+1 st row to the N nd row as the second battery string; wherein N and M are both even;
forming a central bus bar in a gap between an Nth/2 row and an Nth/2 +1 th row, wherein the extending direction of the central bus bar is the same as that of the cell rows, the central bus bar forms a partition area between an nth column and an N +1 th column, N is 2p +1, p is a non-negative integer, and N is less than M; forming M/2 edge connecting bus bars on two opposite sides of the battery piece array along the extension direction of the battery piece array, wherein each edge bus bar corresponds to one first battery unit or one second battery unit;
the center bus bar and the battery strings are connected through the interconnection bars, the end portions of the center bus bar are close to, the edge connection bus bar and the end portions of the battery strings are far away from the center bus bar, the edge connection bus bar and the end portions of the battery strings are connected through the interconnection bars, the end portions of the first battery strings, which are far away from the center bus bar, are respectively located on the nth column and the n +1 th column, the end portions of the second battery strings, which are far away from the center bus bar, are connected in series through the edge connection bus bar, and the first battery units and the second battery units are arranged in parallel along the extension direction of the battery piece columns.
14. The method of manufacturing of claim 13, wherein electrically connecting the plurality of diodes with the main circuit and the jumper wire comprises:
an L-shaped outgoing line is electrically connected to a connection point of the first sub-portion and the second sub-portion of the jumper, a first edge of the L-shaped outgoing line is in fit connection with the jumper, and a second edge of the L-shaped outgoing line is perpendicular to a plane where the cell array is located;
and electrically connecting one diode between the end points of the two central bus bars formed by the partition region and the second side of the L-shaped outgoing line.
15. The manufacturing method according to claim 13, wherein the jumper wire is partially overlapped with the battery plate array along a direction perpendicular to a plane of the battery plate array;
before the forming of the at least one jumper, the method further comprises:
and forming an insulating layer on the battery piece array, wherein the insulating layer is at least formed in an overlapping area of the jumper and the battery piece array.
16. The manufacturing method according to claim 13, wherein the jumper comprises a central conductor and a peripheral insulating layer wrapped outside the central conductor;
before the step of forming at least one jumper, the method further comprises the following steps:
and a peripheral insulating layer is wrapped outside the central lead to form the jumper.
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| CN201910882633.2A CN110581196A (en) | 2019-09-18 | 2019-09-18 | Photovoltaic module and preparation method thereof |
| CN2019108826332 | 2019-09-18 |
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| CN110581196A (en) * | 2019-09-18 | 2019-12-17 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module and preparation method thereof |
| CN113517369A (en) * | 2020-04-10 | 2021-10-19 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module |
| CN115548154A (en) | 2021-06-30 | 2022-12-30 | 浙江晶科能源有限公司 | Photovoltaic module |
| CN113345976A (en) * | 2021-07-29 | 2021-09-03 | 南京日托光伏新能源有限公司 | Multi-parallel circuit assembly based on back contact battery |
| CN114388641B (en) * | 2021-11-03 | 2023-06-23 | 浙江晶科能源有限公司 | Photovoltaic module and photovoltaic module array |
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| CN202513558U (en) * | 2012-03-02 | 2012-10-31 | 天威新能源（扬州）有限公司 | Solar battery hot spot protection circuit |
| CN204632773U (en) * | 2015-04-21 | 2015-09-09 | 江阴鑫辉太阳能有限公司 | The high-efficiency crystal silicon photovoltaic module that during a kind of longitudinally installation, power generation loss is few |
| CN208637433U (en) * | 2018-06-15 | 2019-03-22 | 浙江晶科能源有限公司 | Photovoltaic module |
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| US20180062011A1 (en) * | 2015-01-22 | 2018-03-01 | Solaero Technologies Corp. | Space solar cell panel with blocking diodes |
| CN108258077A (en) * | 2018-03-09 | 2018-07-06 | 天合光能股份有限公司 | A kind of half photovoltaic cell component of full tandem type |
| CN110581196A (en) * | 2019-09-18 | 2019-12-17 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module and preparation method thereof |
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2019
- 2019-09-18 CN CN201910882633.2A patent/CN110581196A/en not_active Withdrawn
- 2019-12-04 CN CN201911228852.5A patent/CN112614908B/en active Active
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202513558U (en) * | 2012-03-02 | 2012-10-31 | 天威新能源（扬州）有限公司 | Solar battery hot spot protection circuit |
| CN204632773U (en) * | 2015-04-21 | 2015-09-09 | 江阴鑫辉太阳能有限公司 | The high-efficiency crystal silicon photovoltaic module that during a kind of longitudinally installation, power generation loss is few |
| CN208637433U (en) * | 2018-06-15 | 2019-03-22 | 浙江晶科能源有限公司 | Photovoltaic module |
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| WO2021052515A1 (en) | 2021-03-25 |
| CN112614908A (en) | 2021-04-06 |
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