CN217822832U - Back contact photovoltaic module - Google Patents
Back contact photovoltaic module Download PDFInfo
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- CN217822832U CN217822832U CN202220920057.3U CN202220920057U CN217822832U CN 217822832 U CN217822832 U CN 217822832U CN 202220920057 U CN202220920057 U CN 202220920057U CN 217822832 U CN217822832 U CN 217822832U
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- contact photovoltaic
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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
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- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The embodiment of the application provides a back contact photovoltaic module, includes: a first substrate; a first insulating layer on a first side of the first substrate; the photovoltaic cell group that is located first insulating layer and keeps away from first base plate one side, photovoltaic cell group includes: a plurality of back contact photovoltaic cells; the conductive adhesive film is positioned on one side, far away from the first insulating layer, of the photovoltaic battery pack, the conductive adhesive film is positioned on the back face of the photovoltaic battery pack, a plurality of conductive wires are arranged on the conductive adhesive film, and the conductive wires cover gaps of orthographic projections of adjacent back-contact photovoltaic cells on the conductive adhesive film and are used for electrically connecting the adjacent back-contact photovoltaic cells; and the second substrate is positioned on one side of the conductive adhesive film, which is far away from the photovoltaic battery pack. The back contact photovoltaic module avoids the problem that the light receiving area is reduced due to the adoption of the welding strip, avoids the problem that the photovoltaic cell is hidden and cracked due to the fact that the welding strip is arranged between the adjacent back contact photovoltaic cells because the flexibility of the welding strip is small, and improves the power and the service life of the back contact photovoltaic module.
Description
Technical Field
The application relates to the field of photovoltaic modules, in particular to a back contact photovoltaic module.
Background
At present, the photovoltaic module has a full-chip package, a half-chip package, a tile-stack package, and other package methods. When the photovoltaic Module is packaged in a full-sheet packaging mode or a half-sheet packaging mode, solder strips are needed To be used for connecting adjacent photovoltaic cells, and the solder strips can cover a part of the area of the photovoltaic cells, so that the light absorption area of the photovoltaic cells is affected, and further the light absorption area of the photovoltaic Module is affected; the photovoltaic module packaged by the shingle-type packaging method is characterized in that the photovoltaic cell is cut to obtain a higher voltage, and then the cut photovoltaic cells are overlapped, so that the CTM rate of the photovoltaic module is higher, the voltage is higher, but the overlapping area of the adjacent photovoltaic cells can also cause the photovoltaic cells to lose a certain light receiving area.
Specifically, the back contact photovoltaic module is characterized in that the P region and the N region in the photovoltaic cell and the grid line in the photovoltaic cell are arranged on the back of the photovoltaic cell, so that the shielding of the grid line on the light receiving area of the photovoltaic cell can be avoided, and the power of the photovoltaic cell is effectively improved. However, in the existing back contact photovoltaic module, the adjacent photovoltaic cells are still welded by using solder strips, which affects the further improvement of the power of the photovoltaic cells.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a back contact photovoltaic module, which adopts the following scheme:
a back-contact photovoltaic module comprising:
a first substrate;
a first insulating layer on a first side of the first substrate;
a photovoltaic cell stack located on a side of the first insulating layer away from the first substrate, the photovoltaic cell stack comprising: a plurality of back contact photovoltaic cells arranged in a predetermined manner;
the conductive adhesive film is positioned on one side, away from the first insulating layer, of the photovoltaic battery pack, the conductive adhesive film is positioned on the back face of the photovoltaic battery pack, and a plurality of conductive wires are arranged on the conductive adhesive film, cover gaps of orthographic projections of the adjacent back-contact photovoltaic cells on the conductive adhesive film and are used for electrically connecting the adjacent back-contact photovoltaic cells;
and the second substrate is positioned on one side, away from the photovoltaic battery pack, of the conductive adhesive film.
Optionally, the size of the conductive wire in a first preset plane gradually increases along a preset direction, wherein the first preset plane is parallel to a plane where the conductive film is located, and the preset direction is perpendicular to the first preset plane and is pointed to the photovoltaic battery pack by the conductive film.
Optionally, a projection shape of the conductive line in a second preset plane is an isosceles triangle, and the second preset plane is perpendicular to the extending direction of the conductive line.
Optionally, the conductive line is embedded in the conductive film, and the thickness of the conductive line is not greater than the thickness of the conductive film.
Optionally, the P and N regions of the plurality of back contact photovoltaic cells are arranged in an interdigitated manner on the back side of the photovoltaic cell stack.
Optionally, a line width of the conductive line towards one end of the photovoltaic cell set is not more than 2 times of a finger width.
Optionally, the conductive wire is a copper conductive wire or a silver conductive wire.
Optionally, the method further includes:
and the second insulating layer is positioned between the conductive sticking film and the second substrate.
Among the back contact photovoltaic module that this application embodiment provided, utilize the conductor wire electricity on the electrically conductive pad pasting to connect adjacent back contact photovoltaic cell, realize the series connection or parallelly connected of adjacent back contact photovoltaic cell, just the conductor wire is located photovoltaic cell's the back can not shelter from photovoltaic cell's positive light receiving area, and no longer adopt to weld the area electricity and connect continuous back contact photovoltaic cell to avoided adopting the problem that the light receiving area that causes of solder strip reduces, and avoided because solder strip pliability is less, lead to setting up the hidden problem of splitting of photovoltaic cell that the solder strip arouses between the adjacent back contact photovoltaic cell, improved back contact photovoltaic module's power and life.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in related technologies, the drawings used in the embodiments or descriptions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
The structures, proportions, and dimensions shown in the drawings and described in the specification are for illustrative purposes only and are not intended to limit the scope of the present disclosure, which is defined by the claims, but rather by the claims, it is understood that these drawings and their equivalents are merely illustrative and not intended to limit the scope of the present disclosure.
Fig. 1 is a schematic structural diagram of a back contact photovoltaic module provided in an embodiment of the present application;
fig. 2 and 3 are schematic diagrams illustrating relative positions of a back contact photovoltaic cell and a conductive wire in a back contact photovoltaic module provided by an embodiment of the present application;
fig. 4 is a cross-sectional view of a conductive line in the conductive patch in a back contact photovoltaic module provided by an embodiment of the present application;
fig. 5 is a schematic diagram of a back-contact photovoltaic device according to an embodiment of the present disclosure, in which P and N regions are arranged in an interdigitated manner.
Detailed Description
The embodiments in this application will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
As described in the background section, in the existing back contact photovoltaic module, solder strips are still used for welding between adjacent photovoltaic cells, which affects further improvement of power of the photovoltaic cells.
In view of this, the present application provides a back-contact photovoltaic module, as shown in fig. 1, including:
a first substrate 10, optionally, the first substrate 10 is a glass substrate, which is not limited in this application as long as the first substrate 10 is a transparent substrate;
a first insulating layer 20 on a first side of the first substrate 10;
a photovoltaic cell group 30 located on a side of the first insulating layer 20 away from the first substrate 10, as shown in fig. 2, the photovoltaic cell group 30 includes a plurality of back-contact photovoltaic cells 31, and the plurality of back-contact photovoltaic cells 31 are arranged in a preset manner;
a conductive film 40 disposed on a side of the photovoltaic cell set 30 away from the first insulating layer 20, the conductive film 40 being disposed on a back side of the photovoltaic cell set 30, and as shown in fig. 2, the conductive film 40 having a plurality of conductive wires 50 thereon, the conductive wires 50 covering a gap of a front projection of the adjacent back-contact photovoltaic cell 31 on the conductive film 40 for electrically connecting the adjacent back-contact photovoltaic cell 31;
the second substrate 60 is located on a side of the conductive adhesive film 40 away from the photovoltaic cell assembly 30, and optionally, the second substrate 60 is a glass substrate, which is not limited in this application as long as the second substrate 60 is a transparent substrate.
Optionally, on the basis of the foregoing embodiment, in an embodiment of the present application, the multiple back-contact photovoltaic cells are closely arranged to form an area of a single photovoltaic module, so as to form a photovoltaic cell group, so as to increase the number of back-contact photovoltaic cells included in the photovoltaic cell group on the premise of the same area. Specifically, the back contact photovoltaic cells may be arranged in a matrix, or in an interdigitated manner, or in other manners, which is not limited in this application and is determined according to the use requirements of the photovoltaic module.
It should be noted that, in this application embodiment, back contact photovoltaic cell's P district and N district and back contact photovoltaic cell's grid line all is located back contact photovoltaic cell's the back, electrically conductive pad pasting in photovoltaic cell group's the back is located adjacent back contact photovoltaic cell's clearance for adjacent back contact photovoltaic cell is connected to the electricity, forms adjacent back contact photovoltaic cell's series connection passageway or parallel connection passageway, realizes adjacent back contact photovoltaic cell's series connection or parallelly connected, strengthens adjacent back contact photovoltaic cell's series connection characteristic or parallel connection characteristic, improves photovoltaic cell group's anti ability of sheltering from. Specifically, in an embodiment of the present application, the extending direction of the conductive wire is a row direction of the photovoltaic cell group and is located in a gap between adjacent back-contact photovoltaic cell rows, but the present application does not limit this, and in other embodiments of the present application, the conductive wire may also be located in a gap between adjacent back-contact photovoltaic cell columns, or located in a gap between adjacent back-contact photovoltaic cell rows and located in a gap between adjacent back-contact photovoltaic cell columns, depending on the electrical connection requirement of each photovoltaic cell in the photovoltaic cell group.
Specifically, in one embodiment of the present application, as shown in fig. 3, the plurality of conductive wires includes a first conductive wire 51 and a second conductive wire 52, wherein the first conductive wire 51 is located in a gap between adjacent columns of back-contact photovoltaic cells for electrically connecting the back-contact photovoltaic cells 31 located in the adjacent columns, and the second conductive wire 52 is located in a gap between adjacent rows of back-contact photovoltaic cells for electrically connecting the back-contact photovoltaic cells 31 located in the adjacent rows.
Optionally, on the basis of any of the above embodiments, in an embodiment of the present application, an area of the conductive adhesive film is the same as an area of the photovoltaic battery pack, but the present application does not limit the area, as long as the area of the conductive adhesive film and the area of the photovoltaic battery pack satisfy the same condition, that is, the area of the conductive adhesive film is the same as the area of the photovoltaic battery pack, or the area of the conductive adhesive film is approximately the same as the area of the photovoltaic battery pack.
Among the back contact photovoltaic module that this application embodiment provided, utilize the conductor wire electricity on the electrically conductive pad pasting to connect adjacent back contact photovoltaic cell, realize the series connection or parallelly connected of adjacent back contact photovoltaic cell, just the conductor wire is located photovoltaic cell's the back can not shelter from photovoltaic cell's positive light receiving area, and no longer adopt to weld the area electricity and connect continuous back contact photovoltaic cell to avoided adopting the problem that the light receiving area that causes of solder strip reduces, and avoided because solder strip pliability is less, lead to setting up the hidden problem of splitting of photovoltaic cell that the solder strip arouses between the adjacent back contact photovoltaic cell, improved back contact photovoltaic module's power and life.
On the basis of any of the above embodiments, in an embodiment of the present application, as shown in fig. 4, a size of the conductive wire 50 in a first preset plane is gradually increased along a preset direction X, wherein the first preset plane is parallel to a plane where the conductive film 40 is located, and the conductive film 40 points to the photovoltaic cell group, so that the conductive wire 50 utilizes a larger area to realize electrical connection of the adjacent back-contact photovoltaic cells 31, reduce contact resistance between the conductive wire 50 and the back-contact photovoltaic cells 31, ensure electrical connection performance of the adjacent back-contact photovoltaic cells 31, and utilize a smaller area to realize electrical connection between the conductive wire 50 and the conductive film 40, reduce cost of the conductive wire 50, and thus reduce cost of the back-contact photovoltaic module.
Optionally, in an embodiment of the present application, as shown in fig. 4, a shape of the conductive line 50 in a second predetermined plane is an isosceles triangle, and the second predetermined plane is perpendicular to an extending direction of the conductive line 50, so that the conductive line 50 adopts a structure of a columnar isosceles triangle, and on the basis of reducing a contact resistance between the conductive line 50 and the back-contact photovoltaic cell 31, electrical contact performance between the conductive line 50 and the adjacent back-contact photovoltaic cell 31 is substantially the same, but the present application does not limit this, and in other embodiments of the present application, the conductive line may also adopt other structures as the case may be.
It should be noted that, in the embodiment of the present application, one end of the conductive wire is electrically connected to the adjacent back contact photovoltaic cell, and the other end of the conductive wire is electrically connected to the conductive film, so that the conductive wire can function as an electrode for connecting the adjacent back contact photovoltaic cell and also as an electrode for the back contact photovoltaic cell, thereby simplifying the structure of the back contact photovoltaic module.
Specifically, in an embodiment of the present application, the conductive wire is embedded in the conductive film, and the thickness of the conductive wire is not greater than the thickness of the conductive film, it should be noted that, in the embodiment, one end of the conductive wire facing the photovoltaic battery pack is flush with one side of the conductive film facing the photovoltaic battery pack, so that the conductive wire can be in direct contact with a back contact photovoltaic cell electrically connected to the conductive wire.
On the basis of any of the above embodiments, in one embodiment of the present application, the conductive wire is a copper wire or a silver wire, so that the conductive wire has a smaller resistivity and a better electrical connection performance, but the present application does not limit the present application.
On the basis of any of the above embodiments, in an embodiment of the present application, the P regions and the N regions of the plurality of back-contact photovoltaic cells are arranged in an interdigitated manner on the back surface of the photovoltaic cell stack, as shown in fig. 5, that is, the P regions of the back-contact photovoltaic cells are in a finger shape, the N regions of the back-contact photovoltaic cells are in a finger shape, and the fingers of the P regions and the fingers of the N regions are arranged in an interdigitated manner.
Optionally, on the basis of the above embodiments, in an embodiment of the present application, the finger width of the P region and the finger width of the N region are the same, but this is not limited in this application, and in other embodiments of the present application, the finger width of the P region and the finger width of the N region may also be approximately the same as long as the finger width of the P region and the finger width of the N region satisfy the same condition. The back contact photovoltaic cell provided by the embodiment of the present application is described below by taking the case that the finger width of the P region is the same as the finger width of the N region.
Specifically, in an embodiment of the present application, the line width of the conductive line toward one end of the photovoltaic battery pack is not greater than 2 times of the finger width, that is, the line width of the conductive line toward one end of the photovoltaic battery pack is not less than the sum of the finger width of the P region and the finger width of the N region, it should be noted that, on the premise that the line width of the conductive line toward one end of the photovoltaic battery pack is not greater than 2 times of the finger width, the greater the line width of the conductive line toward one end of the photovoltaic battery pack, the smaller the contact resistance of the conductive line and the back contact cell is, the better the electrical contact performance is.
On the basis of any of the above embodiments, as shown in fig. 1, the back-contact photovoltaic module further includes: a second insulating layer 70 between the conductive adhesive film 40 and the second substrate 60. In this embodiment, when the back contact photovoltaic module is specifically manufactured, the first substrate, the first insulating layer, the photovoltaic cell module, the conductive adhesive film, the second insulating layer and the second substrate are firstly stacked from bottom to top, and then the lamination processing is performed on the stacked structure formed by the first substrate, the first insulating layer, the photovoltaic cell module, the conductive adhesive film, the second insulating layer and the second substrate.
Optionally, the first insulating layer and the second insulating layer are insulating adhesive films, but the application does not limit this, which is specifically determined as the case may be.
The method for manufacturing the back contact photovoltaic module provided in the embodiment of the present application is described below with reference to a specific embodiment. In this embodiment, the back contact photovoltaic module has a size of 1000mm × 1600mm, and is assembled by using back contact photovoltaic cells with an interdigitated shape of 158mm × 158mm.
Specifically, the manufacturing method of the back contact photovoltaic module comprises the following steps: closely arranging all back contact photovoltaic cells to form a photovoltaic cell group; then designing 1000mm long copper conducting wires with the width of 1mm at 157.5mm intervals and uniformly arranging and embedding the copper conducting wires on the conducting adhesive film with the width of 1000mm 1600mm according to the gap of the adjacent back contact photovoltaic cells, and enabling the conducting wires to be located at the joint of each row of back contact photovoltaic cells; and finally, sequentially placing the glass substrate, the insulating adhesive film, the photovoltaic battery pack, the conductive adhesive film and the glass from bottom to top, and laminating and packaging to complete the manufacturing of the back contact photovoltaic module.
To sum up, the back contact photovoltaic module that this application embodiment provided utilizes the conductor wire electricity on the electrically conductive pad pasting to connect adjacent back contact photovoltaic cell, realizes the series connection or parallelly connected of adjacent back contact photovoltaic cell, just the conductor wire is located photovoltaic cell's the back can not shelter from photovoltaic cell's positive light receiving area, and no longer adopt to weld the area electricity and connect continuous back contact photovoltaic cell to avoided adopting to weld the problem that the area reduces of receiving light that the area arouses, and avoided because the solder strip pliability is less, lead to setting up the hidden problem of splitting of photovoltaic cell that the solder strip arouses between the adjacent back contact photovoltaic cell, improved back contact photovoltaic module's power and life.
The embodiments in the present specification are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, and each embodiment focuses on differences from other embodiments, and similar parts in various embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It should be noted that in the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only used for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may be present.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrases "comprising one of the elements 8230 \8230;" does not exclude the presence of additional like elements in an article or device comprising the same element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A back contact photovoltaic module, comprising:
a first substrate;
a first insulating layer on a first side of the first substrate;
a photovoltaic cell set located on a side of the first insulating layer away from the first substrate, the photovoltaic cell set comprising: a plurality of back contact photovoltaic cells arranged in a predetermined manner;
the conductive adhesive film is positioned on one side, far away from the first insulating layer, of the photovoltaic battery pack, the conductive adhesive film is positioned on the back face of the photovoltaic battery pack, and a plurality of conductive wires are arranged on the conductive adhesive film and cover gaps of orthographic projections of the adjacent back-contact photovoltaic cells on the conductive adhesive film for electrically connecting the adjacent back-contact photovoltaic cells;
and the second substrate is positioned on one side, away from the photovoltaic battery pack, of the conductive adhesive film.
2. The back-contact photovoltaic module of claim 1, wherein the conductive wires have a size that gradually increases in a first predetermined plane along a predetermined direction, wherein the first predetermined plane is parallel to the plane of the conductive film, and the predetermined direction is perpendicular to the first predetermined plane and is directed to the photovoltaic cell by the conductive film.
3. The back-contact photovoltaic module of claim 2, wherein a projected shape of the conductive line in a second predetermined plane is an isosceles triangle, and the second predetermined plane is perpendicular to an extending direction of the conductive line.
4. The back contact photovoltaic module of claim 1, wherein the conductive line is embedded within the conductive film, and the conductive line has a thickness that is no greater than a thickness of the conductive film.
5. The back-contact photovoltaic module of claim 1, wherein the P-regions and N-regions of the plurality of back-contact photovoltaic cells are arranged in an interdigitated formation on the back side of the photovoltaic cell stack.
6. The back contact photovoltaic module of claim 5, wherein the conductive lines have a line width towards one end of the photovoltaic cell stack of no more than 2 times the finger width.
7. The back contact photovoltaic module of claim 1, wherein the conductive wires are copper conductive wires or silver conductive wires.
8. The back-contact photovoltaic module of claim 1, further comprising:
and the second insulating layer is positioned between the conductive adhesive film and the second substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220920057.3U CN217822832U (en) | 2022-04-20 | 2022-04-20 | Back contact photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220920057.3U CN217822832U (en) | 2022-04-20 | 2022-04-20 | Back contact photovoltaic module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217822832U true CN217822832U (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220920057.3U Active CN217822832U (en) | 2022-04-20 | 2022-04-20 | Back contact photovoltaic module |
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| Country | Link |
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| CN (1) | CN217822832U (en) |
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