CN216849964U

CN216849964U - Heterojunction photovoltaic module

Info

Publication number: CN216849964U
Application number: CN202123394474.3U
Authority: CN
Inventors: 罗丽珍; 彭文博; 虞祥瑞; 肖平; 赵东明; 赵惠康; 张宏峰; 舒道旭; 李勇斌; 冯笑丹
Original assignee: Huaneng Clean Energy Research Institute; Huaneng Renewables Corp Ltd; Huaneng Dali Wind Power Co Ltd Eryuan Branch
Current assignee: Huaneng Clean Energy Research Institute; Huaneng Renewables Corp Ltd; Huaneng Dali Wind Power Co Ltd Eryuan Branch
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-06-28
Anticipated expiration: 2031-12-29

Abstract

The utility model provides a heterojunction photovoltaic module, wherein, heterojunction photovoltaic module includes: the battery pack is arranged between the upper glass cover plate and the lower glass cover plate; the battery pack comprises a plurality of battery strings which are distributed in sequence in a first direction; the battery string comprises a plurality of battery pieces, the battery pieces are sequentially arranged in a shingled mode in the second direction and are connected in series, and the battery pieces of the adjacent battery strings are connected in parallel; wherein, the positive pole or the negative pole of a plurality of battery pieces are arranged on the same surface of the battery pack. The utility model provides a heterojunction photovoltaic module has improved photovoltaic module unit area's generated energy, and this heterojunction photovoltaic module has that production flow is simple, inside battery piece connects into this lower advantage.

Description

Heterojunction photovoltaic module

Technical Field

The utility model relates to a photovoltaic technology field especially relates to a heterojunction photovoltaic module.

Background

The laminated assembly adopts a mode of overlapping the battery plates, can increase the power generation amount of the assembly per unit area, and generally adopts a mode of 1-to-6-to-obtain higher voltage for lamination.

The heterojunction battery is one of the most potential next-generation silicon-based batteries, and has the advantages of high theoretical energy conversion efficiency, no need of high-temperature environment for battery preparation, excellent double-faced performance of the battery, less required crystalline silicon material and the like. At present, the stack tile assembly is widely used for various crystalline silicon batteries such as PERC (Passivated emitter and Rear Cell), TOPCon (Tunnel Oxide Passivated Contact) and the like, and is less applied to heterojunction batteries.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the above-mentioned technology to a certain extent. Therefore, an object of the utility model is to provide a heterojunction photovoltaic module, this heterojunction photovoltaic module has improved photovoltaic module unit area's generated energy, and this heterojunction photovoltaic module has that production flow is simple, inside battery piece connects into this lower advantage.

In order to achieve the above object, the present invention provides a heterojunction photovoltaic module, which comprises an upper glass cover plate, a battery pack and a lower glass cover plate, wherein the battery pack is disposed between the upper glass cover plate and the lower glass cover plate; the battery pack comprises a plurality of battery strings which are sequentially distributed in a first direction; the battery string comprises a plurality of battery pieces, the battery pieces are sequentially arranged in a shingled mode in the second direction and are connected in series, and the battery pieces of the adjacent battery strings are connected in parallel; wherein the positive electrodes or the negative electrodes of the plurality of battery pieces are arranged on the same surface of the battery pack.

The utility model discloses a heterojunction photovoltaic module has improved photovoltaic module unit area's generated energy, and this heterojunction photovoltaic module has that production flow is simple, inside battery piece connects into this lower advantage.

In addition, according to the utility model discloses above-mentioned heterojunction photovoltaic module that proposes can also have following additional technical characterstic:

in particular, the first direction is perpendicular to the second direction.

Specifically, an insulating layer is arranged around each of the plurality of battery pieces.

Specifically, an insulating glue is arranged between the parallel battery pieces, wherein the parallel battery pieces are bonded through the insulating glue.

Specifically, each of the plurality of battery cells includes a first region disposed on a first side of the battery cell and a second region disposed on a second side of the battery cell.

Specifically, a conductive adhesive is arranged on the first region and/or the second region, wherein the conductive adhesive is a silicon-based conductive silver adhesive.

Specifically, between the battery pieces connected in series, the first region and the second region are bonded by the conductive adhesive.

Specifically, the battery pack is provided with conductive layers on a first side and a second side thereof.

Specifically, a packaging adhesive film layer is arranged on the conducting layer, and the battery pack is adhered between the upper glass cover plate and the lower glass cover plate through the packaging adhesive film layer.

Specifically, a silver grid line is arranged on the conductive layer, wherein the conductive layer is a transparent conductive layer.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a heterojunction photovoltaic module according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a battery pack according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of parallel battery plates according to an embodiment of the present invention;

fig. 5 is a schematic view of the polarity distribution of the first and second faces of the battery pack according to an embodiment of the present invention;

fig. 6 is a schematic view of a heterojunction cell sheet according to an embodiment of the invention;

fig. 7 is a schematic distribution diagram of a first region and a second region according to an embodiment of the present invention; and

fig. 8 is a schematic diagram of the distribution of the conductive layer and the insulating layer according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The heterojunction photovoltaic module and the method of manufacturing the heterojunction photovoltaic module according to the embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a heterojunction photovoltaic module according to an embodiment of the present invention.

As shown in fig. 1, a heterojunction photovoltaic module 100 according to an embodiment of the present invention may include: an upper glass cover plate 110, a battery pack 120, and a lower glass cover plate 130, wherein the battery pack 120 is disposed between the upper glass cover plate 110 and the lower glass cover plate 130.

Specifically, referring to fig. 2, the battery pack 120 may include a plurality of battery strings 121 sequentially distributed in a first direction (a vertical direction in fig. 2), the battery string 121 may include a plurality of battery cells 10, referring to fig. 3, the plurality of battery cells 10 are sequentially arranged and serially connected in a shingled manner in a second direction, and the battery cells 10 of adjacent battery strings 121 are connected in parallel to form a full serial-parallel structure, which can increase the voltage of the battery pack 120, reduce the current of the battery pack 120, ensure the consistency of the voltage and the current of each battery cell 10 in the battery pack 120, and ensure the stability of power supply of the battery pack 120, so that the heterogeneous photovoltaic module 100 has a strong fault tolerance. It should be noted that the first direction and the second direction described in this embodiment are perpendicular.

Referring to fig. 4, an insulating layer may be disposed around each of the plurality of battery pieces 10, an insulating adhesive may be disposed between the battery pieces 10 connected in parallel, and the battery pieces 10 connected in parallel are bonded by the insulating adhesive.

In an embodiment of the present invention, the positive electrodes or the negative electrodes of the plurality of battery pieces 10 are disposed on the same surface of the battery pack 120. Among other things, the battery pack 120 may include a first side and a second side, which are the positive and negative sides of the battery pack 120.

Specifically, referring to fig. 5, if all of the first sides of the battery pack 120 are positive electrodes, all of the second sides of the battery pack 120 are negative electrodes; if all of the first surfaces of the battery 120 are negative electrodes, all of the second surfaces of the battery 120 are negative electrodes.

It should be noted that the plurality of battery pieces 10 described in this embodiment may include a heterojunction battery piece, which is a solar battery piece and has the advantages of high photoelectric conversion efficiency, excellent double-sided performance, less required crystalline silicon material, and the like. Fig. 6 is a schematic structural diagram of a heterojunction cell, and as shown in fig. 6, the heterojunction cell includes an N (P) type substrate, wherein intrinsic amorphous silicon passivation layers a-Si: h (i) are deposited on the front and back surfaces of the N (P) type substrate, and P-type amorphous silicon layers and N-type amorphous silicon layers are respectively deposited on the intrinsic amorphous silicon passivation layers a-Si: h (i) on the front and back surfaces, and the P-type amorphous silicon layers and the N-type amorphous silicon layers are equal to the positive and negative electrodes of the cell, that is, the P-type amorphous silicon layers and the N-type amorphous silicon layers are the positive and negative electrodes of the heterojunction cell.

In an embodiment of the present invention, referring to fig. 7, each of the plurality of battery pieces 10 may include a first region and a second region, wherein the first region is disposed on the first surface of the battery piece 10, and the second region is disposed on the second surface of the battery piece 10.

The first surface and the second surface of the battery sheet 10 may be the positive electrode surface and the negative electrode surface of the battery sheet 10, and if the first surface is the positive electrode surface of the battery sheet 10, the second surface is the negative electrode surface of the battery sheet 10, and if the first surface is the negative electrode surface of the battery sheet 10, the second surface is the positive electrode surface of the battery sheet 10. The first region and the second region may be rectangular regions at the edges of the first surface and the second surface of the battery cell 10, respectively.

It should be noted that the first region and the second region described in this embodiment are distributed at two opposite edges of the battery piece 10 (see fig. 7), and the size of the first region and the second region may be calibrated according to actual situations and requirements, and is not limited herein.

Further, in an embodiment of the present invention, a conductive adhesive is disposed on the first region and/or the second region, and the conductive adhesive may be a silicon-based conductive silver adhesive. Wherein, between the battery pieces 10 connected in series, the first area and the second area can be adhered through the conductive adhesive.

Specifically, referring to fig. 3, for any battery string 121, it is assumed that the first region of the first battery piece 10 and the last battery piece 10 in the battery string 121 are both provided with conductive paste, the second region is not provided with conductive paste, and assuming that the first and second regions of the other plurality of cells 10 in the cell string 121 are each provided with a conductive paste, the second region of the second cell piece 10 may be bonded to the first region of the first cell piece 10 by a conductive adhesive, the second region of the third cell piece 10 may be bonded to the first region of the second cell piece 10 by a conductive adhesive, … …, the second region of the penultimate cell piece 10 may be bonded to the first region of the last cell piece 10 by a conductive adhesive, in this way, all the battery pieces 10 in the battery string 121 can be bonded together in a shingled manner, and all the battery pieces 10 bonded together are conducted through the conductive adhesive to form a series circuit.

As a possible case, for any battery string 121, it is assumed that the second regions of the first battery piece 10 and the last battery piece 10 in the battery string 121 are both provided with the conductive paste, the first regions are not provided with the conductive paste, and assuming that the first and second regions of the other plurality of cells 10 in the cell string 121 are each provided with a conductive paste, the first region of the second cell piece 10 may be bonded to the second region of the first cell piece 10 by a conductive adhesive, the first region of the third cell piece 10 may be bonded to the second region of the second cell piece 10 by a conductive adhesive, … …, the first region of the penultimate cell piece 10 may be bonded to the second region of the last cell piece 10 by a conductive adhesive, in this way, all the battery pieces 10 in the battery string 121 can be bonded together in a laminated manner, and all the battery pieces 10 bonded together are conducted through the conductive adhesive to form a series circuit.

In an embodiment of the present invention, referring to fig. 8, the first side and the second side of the battery pack 120 are provided with conductive layers, wherein the conductive layers are provided with an encapsulation adhesive film layer, and the battery pack 120 can be adhered between the upper glass cover plate 110 (not shown in fig. 8) and the lower glass cover plate 130 (not shown in fig. 8) through the encapsulation adhesive film layer.

The conductive layer can be a transparent conductive layer, and the transparent conductive layer is connected to replace a solder strip to connect the cell pieces 10, so that the production process of the heterogeneous photovoltaic module 100 can be simplified, and the connection cost of the cell pieces 10 can be reduced.

The conductive layers provided on the insulating layers between the plurality of battery cells 10 in the first direction, that is, the conductive layers on the first and second surfaces of the battery pack 120, cover the insulating layers between the plurality of battery cells 10 in the first direction, and the plurality of battery cells 10 in the first direction are connected in parallel via the conductive layers. Because a plurality of battery pieces 10 in the second direction are connected in series, after the battery pieces 10 in the first direction are connected in parallel, a full serial-parallel structure can be formed, the full serial-parallel structure can improve the voltage of the battery pack 120, reduce the current of the battery pack 120, ensure the consistency of the voltage and the current of each battery piece 10 in the battery pack 120, and ensure the stability of the power supply of the battery pack 120, so that the heterogeneous photovoltaic module 100 has stronger fault tolerance.

In an embodiment of the present invention, the conductive layer is provided with a silver grid line.

Specifically, in order to reduce the resistivity of the conductive layer, a certain density of silver grid lines may be disposed on the conductive layer of the first side and/or the second side of the battery pack 120 to reduce the resistivity of the conductive layer, thereby reducing the internal loss of the battery pack 120.

It should be noted that, a certain density described in this embodiment may be calibrated according to actual situations and requirements, and is not limited herein, and if the resistivity is extremely low, the silver grid lines may not be disposed on the conductive layer of the first surface and/or the second surface of the battery pack 120.

The utility model discloses heterojunction photovoltaic module has improved photovoltaic module unit area's generated energy, and this heterojunction photovoltaic module has that production flow is simple, inside battery piece connects into this lower advantage.

In a practical application scenario, 10 heterojunction battery pieces with the size of 210mm × 210m can be placed on a coating table, flexible insulating glue is brushed on the periphery of each heterojunction battery piece by heterojunction assembly manufacturing equipment to prevent short circuit between the heterojunction battery pieces, then every 5 heterojunction battery pieces are used as one group, the 10 heterojunction battery pieces are divided into two groups, the two groups of heterojunction battery pieces are respectively arranged in a row in a first direction and adhered together to form two rows of heterojunction battery pieces with the length of 1050mm (the width of the heterojunction assembly), wherein the positive electrodes or the negative electrodes of the 5 heterojunction battery pieces in each row of heterojunction battery pieces are on the same surface, the surface where the positive electrodes are located is called as a front surface, and the surface where the negative electrodes are located is called as a back surface. After the insulating glue around the heterojunction battery piece is dried, the heterojunction module manufacturing equipment can coat the conductive layers on the front surface and the back surface of the two rows of heterojunction battery pieces respectively. After the conducting layer is dried, heterojunction module manufacture equipment can brush the conducting resin in the rectangle that the width is 3mm (i.e. the first region of 5 heterojunction battery pieces) at one of them list heterojunction battery piece positive one side edge, length is 1050mm, brush the conducting resin in the rectangle that the width is 3mm (i.e. the second region of 5 heterojunction battery pieces) at another list heterojunction battery piece reverse side one side edge, length is 1050mm, brush the conducting resin in the rectangle that the width is 3mm (i.e. the second region of 5 heterojunction battery pieces), then in the second direction with the tiling mode with above-mentioned two lists of heterojunction battery pieces pass through the conducting resin and glue and link together, form the group battery. After the conductive adhesive is dried, the heterojunction assembly manufacturing equipment can brush packaging adhesive on the conductive layer to form a packaging adhesive film layer, and an upper glass cover plate and a lower glass cover plate are respectively arranged on the packaging adhesive film layers on the two sides of the battery pack, so that the heterojunction photovoltaic assembly is manufactured.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A heterojunction photovoltaic module, comprising: an upper glass cover plate, a battery pack and a lower glass cover plate, wherein,

the battery pack is arranged between the upper glass cover plate and the lower glass cover plate;

the battery pack comprises a plurality of battery strings which are sequentially distributed in a first direction;

the battery string comprises a plurality of battery pieces, the battery pieces are sequentially arranged in a shingled mode in the second direction and are connected in series, and the battery pieces of the adjacent battery strings are connected in parallel; wherein the content of the first and second substances,

the positive electrodes or the negative electrodes of the plurality of battery pieces are arranged on the same surface of the battery pack.

2. A heterojunction photovoltaic module according to claim 1, wherein the first direction is perpendicular to the second direction.

3. The heterojunction photovoltaic module of claim 1, wherein each of said plurality of cells has an insulating layer disposed around it.

4. The heterojunction photovoltaic module of claim 1, wherein an insulating glue is disposed between the parallel-connected cell pieces, and wherein the parallel-connected cell pieces are bonded by the insulating glue.

5. The heterojunction photovoltaic module of claim 1, wherein each of the plurality of cells comprises a first region and a second region, wherein the first region is disposed on a first side of the cell and the second region is disposed on a second side of the cell.

6. A heterojunction photovoltaic module according to claim 5, wherein the first region and/or the second region are provided with conductive paste, wherein the conductive paste is silicon-based conductive silver paste.

7. The heterojunction photovoltaic module of claim 6, wherein between the series-connected cell sheets, the first region and the second region are bonded by the conductive adhesive.

8. A heterojunction photovoltaic module according to claim 1, wherein the first and second faces of the cell stack are provided with conductive layers.

9. A heterojunction photovoltaic module according to claim 8, wherein an encapsulant layer is disposed on the conductive layer, and the battery pack is adhered between the upper glass cover plate and the lower glass cover plate via the encapsulant layer.

10. The heterojunction photovoltaic module of claim 8, wherein the conductive layer is provided with silver grid lines thereon, wherein the conductive layer is a transparent conductive layer.