CN113097326A - Two-sided interconnection film and photovoltaic module - Google Patents
Two-sided interconnection film and photovoltaic module Download PDFInfo
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- CN113097326A CN113097326A CN202110328562.9A CN202110328562A CN113097326A CN 113097326 A CN113097326 A CN 113097326A CN 202110328562 A CN202110328562 A CN 202110328562A CN 113097326 A CN113097326 A CN 113097326A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
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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
-
- 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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- 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 provides a double-sided interconnection film and a photovoltaic module. The method comprises the following steps: the substrate transparent film is divided into a first substrate part, a confluence part and a second substrate part which are sequentially arranged along a first direction, and the substrate transparent film is provided with a first surface and a second surface which are parallel to the first direction; the first main grid line unit is arranged on the first surface of the first base part, the second main grid line unit is arranged on the second surface of the second base part, and the first main grid line unit and the second main grid line unit respectively comprise a first main grid line and a second main grid line; the bus unit is arranged in the bus part and is electrically connected with each first main grid line and each second main grid line respectively. This application is as an organic whole with main grid line and membrane complex, utilizes the unit of converging to carry out the electricity to main grid line and connects, only need the terminal box with converge set up between the unit the wire can, derive the electric current of main grid line with simple circuit structure, simplified the preparation of structure of converging.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to a double-sided interconnection film and a photovoltaic module.
Background
High efficiency and low cost are always the trend of photovoltaic development. The heterojunction battery has the characteristics of high conversion efficiency, low temperature coefficient, excellent double-sided power generation rate and the like, is suitable for flaking, and is considered to be the next generation ultra-high efficiency battery technology with the most industrialization potential. Meanwhile, the heterojunction battery also has the following problems: 1) the interconnection of the conventional heterojunction battery plates needs to adopt a low-temperature welding process, and the welding reliability needs to be further optimized; 2) the double-sided low-temperature silver paste of the heterojunction battery has large using amount and is not beneficial to cost control.
In order to reduce the amount of silver paste, a technology for arranging a main grid line by using a metal line is available at present, namely only an auxiliary grid line is arranged on a battery piece, the metal line is used as the main grid line, and the metal line and the auxiliary grid line are electrically connected after lamination. However, the confluence of the metal wires is difficult to realize, so that the current leading-out structure of the photovoltaic module is complex.
Disclosure of Invention
The invention mainly aims to provide a double-sided interconnection film and a photovoltaic module, and aims to solve the problem that current is led out complicatedly when a metal wire of a photovoltaic cell is used as a main grid line in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a double-sided interconnection film including: a substrate transparent film divided into a first base portion, a bus portion, and a second base portion sequentially arranged in a first direction, and having a first surface and a second surface parallel to the first direction; a first main gate line unit disposed on a first surface of the first base portion, the first main gate line unit including one or more first main gate lines; a second bus bar unit disposed on the second surface of the second base portion, the second bus bar unit including one or more second bus bars; and the bus unit is arranged in the bus part and is electrically connected with each first main grid line and each second main grid line respectively.
Further, the above-mentioned confluence unit includes: the first bus bar region is arranged on the first surface of the bus part and is electrically connected with each first main grid line; the second bus bar region is arranged on the second surface of the bus bar part and is electrically connected with each second main grid line; the confluence post penetrates through the confluence part, one end of the confluence post is electrically connected with the first confluence area, and the other end of the confluence post is electrically connected with the second confluence area.
Further, the above-mentioned confluence post is a plurality of.
Furthermore, the number of the first main grid lines and the number of the second main grid lines are respectively 3-50, the first main grid lines are arranged in parallel, and the second main grid lines are arranged in parallel.
Furthermore, the first main gate lines and the second main gate lines are arranged in a one-to-one correspondence manner.
Further, the first main gate line and the second main gate line are respectively and independently a cured conductive paste gate line or a metal gate line layer, and preferably, the first main gate line and the second main gate line are disposed on the substrate transparent film through one of screen printing, inkjet printing, a coating process, electroplating, chemical plating, physical vapor deposition, and chemical vapor deposition processes.
Furthermore, the materials of the first bus bar area and the second bus bar area and the materials of the bus bars and the first main grid line are the same.
Further, the substrate transparent film is a hot melt film or a pressure sensitive adhesive film, and preferably has a thickness of 20 to 300 μm.
According to another aspect of the present invention, there is provided a photovoltaic module including a front glass, a front adhesive film, a photovoltaic cell unit, a rear adhesive film, and a rear encapsulant sheet, which are stacked in this order, the photovoltaic cell unit including: a plurality of any one of the above double-sided interconnect films; the surface of each battery piece is provided with an auxiliary grid line, the surfaces of the double-sided interconnection film, which are provided with the first main grid line unit and the second main grid line unit, are respectively provided with the battery pieces, and the auxiliary grid lines are electrically connected with the first main grid lines or the second main grid lines.
Further, the pair of gate lines and the first main gate line are arranged to cross at a first angle, and the pair of gate lines and the second main gate line are arranged to cross at a second angle, preferably the first angle is 30-90 degrees, and preferably the second angle is 30-90 degrees.
Furthermore, the battery piece that above-mentioned vice grid line and first main grid line electricity are connected is last battery piece, the battery piece that vice grid line and second main grid line electricity are connected is lower battery piece, adjacent last battery piece and lower battery piece pass through the portion interval that converges and set up on two-sided interconnection membrane, it corresponds the first base portion setting of two-sided interconnection membrane to go up the battery piece, lower battery piece corresponds the second base portion setting of two-sided interconnection membrane, the width of portion of converging in the first direction is greater than the twice of the thickness of battery piece, it is preferable that the width of portion of converging in the first direction is W1, the width of the post of converging in the first direction of portion of converging is W2, the thickness of battery piece is H, W1-W2 is greater than or equal to 2H.
Furthermore, the battery piece of the auxiliary grid line electrically connected with the first main grid line is an upper battery piece, the battery piece of the auxiliary grid line electrically connected with the second main grid line is a lower battery piece, the adjacent projections of the upper battery piece and the lower battery piece on the double-sided interconnection film are overlapped, and at least part of the projection overlapping area is positioned on the confluence part of the double-sided interconnection film.
By applying the technical scheme of the invention, the main grid lines and the confluence units are arranged on the two sides of the double-sided interconnection film, so that the current collection of the battery piece matched with the double-sided interconnection film can be completed only by arranging the auxiliary grid lines, and the two sides of the double-sided interconnection film are provided with the main grid lines and the confluence units, so that the two batteries can form a battery string under the connection of the double-sided interconnection film, thereby reducing the use of conductive materials, lowering the cost, shortening the conduction distance of the current, lowering the series resistance of the assembly and reducing the resistance loss. Therefore, the bus bar and the film are compounded into a whole, the bus bar is electrically connected by the bus bar unit, only the wire is needed to be arranged between the junction box and the bus bar unit, the current of the bus bar is led out without designing a complex line structure, and the bus bar structure and the film are compounded, so that the manufacturing of the bus bar structure is simplified.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a top view of a double-sided interconnect film prepared according to example 1 of the present invention;
fig. 2 shows a side view of a double-sided interconnect film prepared according to example 1 of the present invention;
fig. 3 shows a front view of a battery string prepared according to example 3 of the present invention; and
fig. 4 shows a front view of a battery string prepared according to example 4 of the present invention.
Wherein the figures include the following reference numerals:
10. a base transparent film; 20. a first main gate line unit; 30. a second main gate line unit; 40. a confluence unit; 41. a first bus region; 42. a second bus region; 43. a converging column; 50. a battery piece.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As described in the background art, in the prior art, it is inefficient to set a main gate line by a method of manually laying a metal line, and to this problem, the present application provides a double-sided interconnection film and a photovoltaic module.
In an exemplary embodiment of the present application, there is provided a double-sided interconnection film, as shown in fig. 1 to 2, including a base transparent film 10, a first bus line unit 20, a second bus line unit 30, and a bus bar unit 40; the above-mentioned base transparent film 10 is divided into a first base portion, a bus portion, and a second base portion which are sequentially arranged in a first direction, and the base transparent film 10 has a first surface and a second surface parallel to the first direction; the first bus line unit 20 is disposed on the first surface of the first base portion, and the first bus line unit 20 includes one or more first bus lines; the second bus line unit 30 is disposed on the second surface of the second base portion, and the second bus line unit 30 includes one or more second bus lines; the bus bar unit 40 is disposed in the bus bar portion and electrically connected to each of the first and second bus bars, respectively.
The base transparent film 10 of the present application is divided into three regions: the first base portion, the bus portion, and the second base portion have two parallel surfaces, which are a first surface and a second surface, respectively. The first main grid line unit 20 is arranged on the first surface of the first substrate portion, and the second main grid line unit 30 is arranged on the second surface of the second substrate portion, namely, the first main grid line unit 20 and the second main grid line unit 30 are arranged on two surfaces of the substrate transparent film 10, so that a double-sided interconnection film is formed. The two main grid line units are respectively provided with a main grid line, and when the photovoltaic module is applied, the double-sided interconnection film is in contact with the battery piece 50, so that the main grid lines are electrically connected with the auxiliary grid lines on the battery piece 50, and the current collecting effect is achieved. Besides, the bus bar unit 40 is arranged at the bus bar part, and the bus bar unit 40 is electrically connected with each first main grid line and each second main grid line so as to further facilitate the conduction of the collected current. It can be seen from the above description that the two-sided interconnection membrane of this application all is provided with main grid line and the unit 40 that converges on two sides, make rather than supporting battery piece 50 that uses only need set up vice grid line alright accomplish the collection to the electric current, and, because both sides all are provided with main grid line and the unit 40 that converges, make two batteries under the connection of the two-sided interconnection membrane of this application, can form the battery cluster, the use of conducting material has been reduced on the one hand, and therefore, the cost is reduced, on the other hand, the conduction distance of electric current has been shortened, the series resistance of subassembly can be reduced, reduce the resistance loss. Therefore, the bus bar and the film are compounded into a whole, the bus bar unit 40 is utilized to electrically connect the bus bar, only the wiring is needed to be arranged between the junction box and the bus bar unit 40, the complicated circuit structure is not needed to be designed to lead out the current of the bus bar, and the bus bar structure and the film are compounded, so that the manufacturing of the bus bar structure is simplified.
In one embodiment, a structural design of the bus bar unit 40 is provided, for example, the above-mentioned bus bar unit 40 includes a first bus bar region 41, a second bus bar region 42, and a bus post 43, the first bus bar region 41 is disposed on a first surface of the bus bar portion, and is electrically connected to each first bus bar; the second bus bar region 42 is disposed on the second surface of the bus portion, and is electrically connected to each second bus bar line; the bus bar 43 is disposed through the bus portion, and one end of the bus bar 43 is electrically connected to the first bus bar region 41 and the other end is electrically connected to the second bus bar region 42. The first bus bar region 41 and the second bus bar region 42 are used for respectively connecting each first main gate line and each second main gate line, so that the current collection effect on the first main gate line and the second main gate line is realized; and the first confluence region 41 and the second confluence region 42 are connected by the confluence post 43, so that the effect of collecting the current of the two battery pieces 50 by the same confluence unit 40 is realized, the number of the confluence units 40 is reduced, and the use of conductive materials is saved.
The transparent substrate film 10 of the double-sided interconnection film of the present application can be prepared in a manner of extrusion casting, and can also be prepared by using other mold making processes in the prior art, which is not described in detail herein. The bus bars may be disposed on the transparent substrate film 10 in various ways, such as by printing, coating, or inkjet printing. The shape of the main grid line can be a straight line, a curve, a ring line or any other shape, and can also be any combination of a plurality of shapes. The above-mentioned confluence post 43 may be disposed inside the base transparent film 10 by a two-step process: the transparent base film 10 is first perforated and then a conductive material is disposed inside the perforations. The number of the holes can be one or more, and the hole punching mode can be any process for punching the film in the prior art, including laser punching, mechanical punching and the like; the above-mentioned mode of setting up conductive material also has the multiple, can pour conductive metal thick liquids into downthehole, also can imbed conductive metal pillar in downthehole. By providing the above-described bus bar unit 40 having the first bus bar region 41, the second bus bar region 42, and the bus bar 43, currents generated from the batteries contacting the first and second bus bar units 20 and 30 are collected together.
When there is only one bus bar 43, the cross-sectional area of the bus bar 43 perpendicular to the direction of current flow needs to be increased appropriately in order to reduce the resistance, which may result in an excessively large hole in the transparent film 10 of the substrate, making it easy to break during use, and therefore, it is preferable that there are a plurality of bus bars 43, which can reduce the resistance while ensuring the structural stability of the double-sided interconnection film.
In one embodiment, the number of the first main gate lines and the number of the second main gate lines are respectively 3 to 50, the first main gate lines are arranged in parallel, and the second main gate lines are arranged in parallel. The main grid line is set to be a plurality of parallel straight lines, so that the surface shielding of the cell 50 is reduced, the light receiving area of the solar cell connected with the double-sided interconnection film is increased, the conduction distance of current is shortened, the series resistance of the assembly can be reduced, and the resistance loss is reduced. In addition, the quantity of conductive materials used for the main grid line can be reduced, and the tolerance degree on hidden cracks and breakage is higher.
In one embodiment, the first main gate lines and the second main gate lines are arranged in a one-to-one correspondence. The standardized production of the double-sided interconnection film is realized by arranging the main grid lines in the form of the same number of parallel straight lines on the first main grid line unit 20 and the second main grid line unit 30.
In order to reduce the resistance loss of the main gate lines, the first main gate line and the second main gate line are preferably a cured conductive paste gate line or a metal gate line layer, and the first main gate line and the second main gate line are further preferably arranged on the substrate transparent film 10 through one of screen printing, inkjet printing, a coating process, electroplating, chemical plating, physical vapor deposition and chemical vapor deposition processes, so as to further improve the efficiency of arranging the main gate lines.
Preferably, the materials of the first bus bar region 41 and the second bus bar region 42, and the materials of the bus bar 43 and the first bus bar line are the same, so that stress resistance during material connection is reduced, and resistance loss is reduced.
The substrate transparent film 10 can be made of various adhesive film materials in the prior art, in order to further improve the bonding force between the substrate transparent film 10 and the battery piece 50 and the packaging adhesive film and the structural stability of the double-sided interconnection film, the substrate transparent film 10 is preferably a hot-melt film or a pressure-sensitive adhesive film, the thickness of the substrate transparent film 10 is preferably 20-300 μm, and the bonding performance of the double-sided interconnection film is further improved.
In another exemplary embodiment of the present application, there is provided a photovoltaic module including a front glass, a front adhesive film, a photovoltaic cell unit, a rear adhesive film, and a rear encapsulant sheet, which are stacked in this order, the photovoltaic cell unit including: a plurality of any one of the above double-sided interconnection films and a plurality of battery slices 50, the surface of each battery slice 50 is provided with a secondary grid line, the surface of the double-sided interconnection film provided with the first main grid line unit 20 and the surface provided with the second main grid line unit 30 are respectively provided with a battery slice 50, and the secondary grid line is electrically connected with the first main grid line or the second main grid line.
The used two-sided interconnection membrane of this application photovoltaic module all is provided with main grid line and the unit 40 that converges on two sides, make with the supporting battery piece 50 that uses only need set up vice grid line alright accomplish the collection to the electric current, and, because the two sides all is provided with main grid line and the unit 40 that converges, make two batteries under the connection of the two-sided interconnection membrane of this application, can form the battery cluster, the use of conducting material has been reduced on the one hand, on the other hand the conduction distance of electric current has been shortened, can reduce the series resistance of subassembly, reduce the resistance loss, effectively reduced photovoltaic module's cost and promoted its photoelectric conversion efficiency to a certain extent. Therefore, the bus bar and the film are compounded into a whole, the bus bar unit 40 is utilized to electrically connect the bus bar, only the wiring is needed to be arranged between the junction box and the bus bar unit 40, the complicated circuit structure is not needed to be designed to lead out the current of the bus bar, and the bus bar structure and the film are compounded, so that the manufacturing of the bus bar structure is simplified. In one embodiment, the pair of gate lines and the first main gate line are arranged to cross at a first angle, and the pair of gate lines and the second main gate line are arranged to cross at a second angle, preferably the first angle is 30 to 90 degrees, and preferably the second angle is 30 to 90 degrees. Through the arrangement of the crossing angle of the auxiliary grid lines and the main grid lines, the conduction distance of current can be further shortened, and the series resistance of the component can be reduced.
In one embodiment, as shown in fig. 4, the cell piece 50 electrically connected to the first main grid line by the above-mentioned minor grid line is an upper cell piece, the cell piece 50 electrically connected to the second main grid line by the minor grid line is a lower cell piece, the adjacent upper cell piece and lower cell piece are arranged at intervals on the double-sided interconnection film through the confluence part, the upper cell piece is arranged corresponding to the first base part of the double-sided interconnection film, the lower cell piece is arranged corresponding to the second base part of the double-sided interconnection film, the width of the confluence part in the first direction is greater than twice the thickness of the cell piece 50, preferably, the width of the confluence part in the first direction is W1, the width of the confluence pillar 43 of the confluence part in the first direction is W2, the thickness of the cell piece 50 is H, and W1-W2 is not less than 2H. Through the above connection mode, every two adjacent battery pieces 50 are connected through one above double-sided interconnection film, and because the thickness of the double-sided interconnection film is very thin, each battery piece 50 is equivalently tiled between the front plate glass and the rear layer packaging plate. And through the setting of above-mentioned width, guaranteed that the deformation can not take place to drag in the two-sided interconnection membrane after the lamination, and then guaranteed the stability of electricity connection.
In one embodiment, the cell 50 electrically connected to the first main gate line by the sub-gate line is an upper cell, the cell 50 electrically connected to the second main gate line by the sub-gate line is a lower cell, the projections of the adjacent upper and lower cells on the double-sided interconnect film overlap, and at least a part of the projection overlapping region is located on the bus portion of the double-sided interconnect film. Through the above connection method, every two adjacent battery pieces 50 are connected through one of the above double-sided interconnection films and stacked in a shingled manner, so as to reduce the distance between the battery pieces 50, further reduce the resistance loss, shorten the conduction distance of the current, reduce the series resistance of the module, and reduce the resistance loss.
The following examples are provided to further illustrate the advantageous effects of the present invention.
Example 1
1) Preparing a substrate transparent film 10 made of EVA material with the thickness of 50 mu m by using an extrusion casting mode;
2) punching 5 through holes on the substrate transparent film 10 in a laser punching mode along a certain direction, wherein the diameter of the cross section of each hole is 1mm, the distance between the centers of the cross sections of the holes is 30mm, and the through holes are filled with silver paste to form a confluence column 43;
3) coating silver paste on the areas of the two surfaces of the transparent film 10 in contact with the bus bars 43 to form a first bus area 41 and a second bus area 42 with the thickness of 1mm 150mm 0.2mm, and forming a bus unit 40 together with the bus bars 43;
4) taking the boundary of the confluence area as a starting point, respectively coating 7 main grid lines of 1mm × 150mm × 0.2mm on two surfaces of the substrate transparent film 10 to form a first main grid line unit 20 and a second main grid line unit 30;
5) the base transparent film 10 was cut into 150mm by 300mm size double-sided interconnect film as shown in fig. 1.
Example 2
1) Preparing a POE substrate transparent film with the thickness of 100 by using an extrusion casting mode;
2) punching 3 through holes on a substrate transparent film in a mechanical punching mode along a certain direction, wherein the diameter of the cross section of each through hole is 2mm, the distance between the centers of the circle of the cross sections of the through holes is 50mm, and embedding copper columns in the through holes to form a confluence column;
3) depositing copper on areas, which are in contact with the confluence columns, on two surfaces of the substrate transparent film respectively to form a first confluence area and a second confluence area which are 2mm by 150mm by 0.3 mm;
4) respectively printing 5 main grid lines of 2mm by 150mm by 0.3mm on two surfaces of a transparent film of a substrate by taking the boundary of a confluence region as a starting point;
5) the substrate transparent film was cut to 150mm by 300mm size and the resulting double-sided interconnect film was shown in fig. 1.
Example 3
The battery piece 50 is placed with the front side facing down, the double-sided interconnection film prepared in example 1 is placed under the first battery piece 50, the first main grid line unit 20 corresponds to the front side of the battery piece 50, and the main grid lines correspond to the auxiliary grid lines on the battery piece 50. A second battery piece 50 is placed below the first main grid line unit 20 of the double-sided interconnection film, the second main grid line unit 30 corresponds to the back of the second battery piece 50, the main grid lines correspond to the auxiliary grid lines on the battery piece 50, the double-sided interconnection film prepared in another embodiment 1 is taken, the first main grid line unit 20 corresponds to the front of the second battery piece, and so on. After the photovoltaic module is packaged, the double-sided interconnection film and the battery plates 50 together form a battery string.
Example 4
The battery piece 50 is placed with the front side facing down, the double-sided interconnection film prepared in example 2 is placed under the first battery piece 50, the first main grid line unit 20 and the bus unit 40 correspond to the front side of the battery piece 50, and the main grid lines correspond to the auxiliary grid lines on the battery piece 50. A second battery piece 50 is placed below the first main grid line unit 20 and the confluence unit 40 of the double-sided interconnection film, the second main grid line unit 30 and the confluence unit 40 correspond to the back of the second battery piece 50, the main grid lines correspond to the auxiliary grid lines on the battery piece 50, the double-sided interconnection film prepared in another embodiment 2 is taken, the first main grid line unit 20 and the confluence unit 40 correspond to the front of the second battery piece, and so on. After the photovoltaic module is packaged, the double-sided interconnection film and the battery plates 50 together form a battery string.
The module production all adopts 60 models, and 10 battery pieces are strung each other, totally 6 strings, and the battery piece is carried out the shelves according to conversion efficiency, adopts same gear battery piece (conversion efficiency difference 0.1%) to carry out power contrast test. The subassembly is dual glass assembly, and the encapsulation glued membrane adopts POE. The lamination process was 150 deg.C for 18 min.
The power of the solar cell module obtained in each example and comparative example is detected according to the method specified in the photovoltaic standard IEC61215-10.2, and the results are as follows:
the power of the assembly prepared in example 3 was 347W, the power of the assembly prepared in example 4 was 346W, and the power of the assembly using the conventional solder ribbon interconnection process (comparative example) was 335W. Therefore, the photovoltaic module prepared by the interconnection process has the advantage that the generated power is improved to a certain extent compared with that of a conventional module.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the utility model provides a two-sided interconnection membrane all is provided with main grid line and the unit that converges on two sides, make the battery piece rather than supporting use only need set up vice grid line alright accomplish the collection to the electric current to, because both sides all are provided with main grid line and the unit that converges, make two batteries under the connection of this application two-sided interconnection membrane, can form the battery cluster, reduced conducting material's use on the one hand, and reduce cost, on the other hand has shortened the conduction distance of electric current, can reduce the series resistance of subassembly, reduce resistance loss. Therefore, the bus bar and the film are compounded into a whole, the bus bar is electrically connected by the bus bar unit, only the wire is needed to be arranged between the junction box and the bus bar unit, the current of the bus bar is led out without designing a complex line structure, and the bus bar structure and the film are compounded, so that the manufacturing of the bus bar structure is simplified.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A double-sided interconnect film, comprising:
a base transparent film (10), the base transparent film (10) being divided into a first base portion, a bus portion, and a second base portion that are sequentially arranged in a first direction, and the base transparent film (10) having a first surface and a second surface that are parallel to the first direction;
a first bus bar unit (20) disposed on a first surface of the first base portion, the first bus bar unit (20) including one or more first bus bars;
a second bus bar unit (30) disposed on a second surface of the second base portion, the second bus bar unit (30) including one or more second bus bars;
and the bus unit (40) is arranged in the bus part, and is respectively and electrically connected with each first main grid line and each second main grid line.
2. The double-sided interconnect film of claim 1, wherein the bus bar unit (40) comprises:
a first bus bar region (41) disposed on a first surface of the bus bar portion and electrically connected to each of the first bus bars;
a second bus bar region (42) disposed on the second surface of the bus portion and electrically connected to each of the second bus bars;
the confluence post (43) penetrates through the confluence part, one end of the confluence post (43) is electrically connected with the first confluence area (41), and the other end of the confluence post is electrically connected with the second confluence area (42).
3. The double-sided interconnecting film of claim 2, wherein the bus bars (43) are plural.
4. The double-sided interconnect film of claim 1, wherein the number of the first bus bars and the number of the second bus bars are each independently 3 to 50, the first bus bars are arranged in parallel with each other, and the second bus bars are arranged in parallel with each other.
5. The double-sided interconnect film of claim 4, wherein each of the first bus bars and each of the second bus bars are disposed in one-to-one correspondence.
6. The double-sided interconnect film of claim 1, wherein the first and second bus bars are each independently a cured conductive paste gate line or a metal gate line layer, preferably the first and second bus bars are disposed on the base transparent film (10) by one of screen printing, ink jet printing, coating process, electroplating, electroless plating, physical vapor deposition, chemical vapor deposition process.
7. The double-sided interconnect film of claim 2, wherein the material of the first bus bar region (41), the second bus bar region (42), and the bus bar pillars (43) are the same as the material of the first bus bar lines.
8. The double-sided interconnect film of claim 1, wherein the base transparent film (10) is a hot melt film or a pressure sensitive adhesive film, preferably the thickness of the base transparent film (10) is 20-300 μm.
9. The utility model provides a photovoltaic module, includes front bezel glass, front rubber membrane, photovoltaic cell piece unit, back glue membrane and the back packaging board of superpose in proper order, its characterized in that, photovoltaic cell piece unit includes:
a plurality of the double-sided interconnect films of any one of claims 1-8;
the surface of each battery piece (50) is provided with an auxiliary grid line, the surface of the double-sided interconnection film, which is provided with the first main grid line unit (20) and the second main grid line unit (30), is provided with the battery piece (50), and the auxiliary grid lines are electrically connected with the first main grid lines or the second main grid lines.
10. The photovoltaic module of claim 9, wherein the minor grid lines and the first major grid lines are disposed at a first angle and the minor grid lines and the second major grid lines are disposed at a second angle, preferably the first angle is 30-90 °, and preferably the second angle is 30-90 °.
11. The photovoltaic module of claim 9, wherein the cell (50) where the minor grid line is electrically connected to the first major grid line is an upper cell, the battery piece (50) electrically connected with the second main grid line and the auxiliary grid line is a lower battery piece, the adjacent upper battery piece and the lower battery piece are arranged on the double-sided interconnection film at intervals through the confluence part, the upper cell piece is arranged corresponding to the first base part of the double-sided interconnection film, the lower cell piece is arranged corresponding to the second base part of the double-sided interconnection film, the width of the bus bar portion in the first direction is greater than twice the thickness of the battery piece (50), preferably the width of the bus bar portion in the first direction is W1, the width of a confluence post (43) of the confluence part in the first direction is W2, the thickness of the battery piece (50) is H, and W1-W2 is more than or equal to 2H.
12. The photovoltaic module according to claim 9, wherein the cell (50) electrically connected to the first main grid line by the sub-grid line is an upper cell, the cell (50) electrically connected to the second main grid line by the sub-grid line is a lower cell, adjacent projections of the upper cell and the lower cell on the double-sided interconnection film are overlapped, and at least a part of the projection overlapping region is located on a bus bar portion of the double-sided interconnection film.
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