CN112086520A

CN112086520A - Solar cell module and preparation method

Info

Publication number: CN112086520A
Application number: CN202011034441.5A
Authority: CN
Inventors: 陈斌; 黄宗明; 周艳方
Original assignee: JA Solar Technology Yangzhou Co Ltd
Current assignee: Jingao Yangzhou New Energy Co ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2020-12-15
Anticipated expiration: 2040-09-27
Also published as: CN112086520B

Abstract

The invention discloses a solar cell module and a preparation method thereof. The solar cell module includes: the battery comprises a battery string group, a first conductive structure and a back plate, wherein the battery string group comprises a first battery piece and two battery strings, and a backlight surface of the first battery piece is provided with a positive electrode and a negative electrode; the first conductive structure is arranged on the back plate and comprises a first conductive area and a second conductive area, wherein the first conductive area is electrically isolated from the second conductive area; the first battery piece covers the first conductive structure; the two battery strings are respectively and electrically connected with the first conductive area and the second conductive area so as to be connected in series through the first battery piece and the first conductive structure. The scheme provided by the invention can effectively improve the conversion efficiency of the solar cell module.

Description

Solar cell module and preparation method

Technical Field

The invention relates to the technical field of solar cells, in particular to a solar cell module and a preparation method thereof.

Background

The solar cell module is formed by connecting a plurality of solar cell strings in series/parallel and tightly packaging, and is a photovoltaic cell combination device which realizes minimum inseparability of photovoltaic power generation.

At present, the serial connection/parallel connection between solar cell strings is mainly realized through bus bars or bus bars, when the bus bars or the bus bars are used, partial surfaces of the solar cells can be covered, the invalid area of a solar cell module (namely, an area which can not be subjected to photoelectric conversion) can be inevitably increased, and the conversion efficiency of the solar cell module is limited to a certain extent.

Disclosure of Invention

In view of this, embodiments of the present invention provide a solar cell module and a manufacturing method thereof, which can reduce or even avoid the use of a bus bar, thereby effectively improving the conversion efficiency of the solar cell module.

To achieve the above object, according to an aspect of an embodiment of the present invention, there is provided a solar cell module including: a battery string set, a first conductive structure and a back plate, wherein,

the battery string group comprises a first battery piece and two battery strings, wherein a backlight surface of the first battery piece is provided with a positive electrode and a negative electrode;

the first conductive structure is arranged on the back plate and comprises a first conductive area and a second conductive area, wherein the first conductive area is electrically isolated from the second conductive area;

the first battery piece covers the first conductive structure, so that the positive electrode and the negative electrode are respectively and electrically connected with the first conductive area and the second conductive area;

one end of the battery string and one end of the other battery string in the two battery strings are electrically connected with the first conductive area and the second conductive area respectively, so that the two battery strings are connected in series through the first battery piece and the first conductive structure.

Preferably, the first and second electrodes are formed of a metal,

the first conductive structure includes a conductive layer and an isolation trench, wherein,

the isolation groove is used for isolating the conductive layer from the first conductive area and the second conductive area.

Preferably, the first and second electrodes are formed of a metal,

the first conductive region and the second conductive region are arranged corresponding to the distribution of the positive electrode and the negative electrode of the first battery piece.

Preferably, the first and second electrodes are formed of a metal,

one edge of the conductive layer is divided into two edge portions by the isolation groove, wherein the edge is close to the two battery strings;

the two edge portions belong to the first conductive region and the second conductive region.

Preferably, the first and second electrodes are formed of a metal,

one end of one of the battery strings and one end of the other of the battery strings are electrically connected to one of the edge portions and the other of the edge portions, respectively.

Preferably, the first and second electrodes are formed of a metal,

each of the battery strings includes: a second cell piece, wherein,

the second battery piece is arranged at the other end of the battery string, and a backlight surface of the second battery piece is provided with a positive electrode and a negative electrode.

Preferably, the solar cell module further comprises: a second electrically conductive structure, wherein,

the second conductive structure includes: a third conductive region and a fourth conductive region, wherein the third conductive region is electrically isolated from the fourth conductive region;

the second battery piece covered on the second conductive structure is respectively included in the two battery strings in the battery string group, and the battery string group is connected in series through the third conductive area and the fourth conductive area.

Preferably, the first and second electrodes are formed of a metal,

the number of the battery string groups is multiple, and the battery string groups are connected in series and/or in parallel.

Preferably, the solar cell module further comprises: an insulating layer and a third conductive structure, wherein,

the insulating layer is provided with a through hole, wherein the through hole is matched with the positive electrode of the first battery piece and the negative electrode of the first battery piece;

the third conductive structure penetrates through the through hole, one end of the third conductive structure is connected with the first battery piece, and the other end of the third conductive structure is connected with the first conductive structure.

In a second aspect, an embodiment of the present invention provides a method for manufacturing a solar cell module, including:

laying a first conductive structure on a backplane, the first conductive structure comprising a first conductive region and a second conductive region, wherein the first conductive region is electrically isolated from the second conductive region;

covering a first battery piece on the first conductive structure, wherein a backlight surface of the first battery piece is provided with a positive electrode and a negative electrode, so that the positive electrode and the negative electrode are respectively and electrically connected with the first conductive area and the second conductive area;

and electrically connecting the two battery strings with the first conductive region and the second conductive region respectively so as to connect the two battery strings in series through the first battery piece and the first conductive structure.

Preferably, with respect to the solar cell module provided in the embodiment of the first aspect, a fourth cell is further disposed at the other end of the one cell string and the other end of the other cell string, a backlight surface of the fourth cell has a positive electrode and a negative electrode, and the positive electrode and the negative electrode of the fourth cell are electrically connected to the one cell string and the other cell string respectively through a third conductive structure disposed on the back plate, so as to form a series connection of cell string groups.

Preferably, for the solar cell module provided in the embodiment of the first aspect, the number of the cell string sets is multiple, at least two cell string sets connected in series constitute one series set, the solar cell module includes an upper series set and a lower series set, the two series sets are connected in parallel, the cell string sets in the two parallel series sets are arranged in a one-to-one correspondence manner, one end of one cell string set in the two correspondingly arranged cell string sets corresponds to one end of the other cell string set, and the two correspondingly arranged cell string sets share the same diode.

Preferably, the two correspondingly arranged battery strings are electrically connected with the second conductive structure.

Preferably, for the solar cell module provided in the embodiments of the first aspect, the solar cell module may further include: and the bonding layer is arranged between the first conductive structure and the back plate and is used for bonding the first conductive structure to the back plate.

Preferably, the solar cell module provided in relation to the first aspect further includes: the battery pack comprises a cover plate and an encapsulation layer, wherein the encapsulation layer is filled between the battery pack and the cover plate.

Preferably, the method for manufacturing a solar cell module provided in an embodiment of the second aspect further includes: laying a second conductive structure on the backplane, the second conductive structure comprising a third conductive region and a fourth conductive region, wherein the third conductive region is electrically isolated from the fourth conductive region; and second battery pieces respectively included by two battery strings in the battery string group cover the second conductive structure, and the battery string group is connected in series through the third conductive region and the fourth conductive region, wherein the second battery pieces are arranged at the other ends of the battery strings, and the backlight surfaces of the second battery pieces are provided with positive electrodes and negative electrodes.

One embodiment of the above invention has the following advantages or benefits: the series connection between the two battery strings in the battery string group of the solar battery component can be realized through the first battery piece and the first conductive structure arranged on the back plate, namely the first battery piece covers the first conductive structure, so that a positive electrode and a negative electrode on a backlight surface of the first battery piece are respectively and electrically connected with the first conductive area and the second conductive area, and the two battery strings are respectively and electrically connected with the first conductive area and the second conductive area, so that the series connection between the battery strings is realized. On one hand, the first cell covers the first conductive structure, so that the light receiving surface of the first cell is not shielded, and on the other hand, the bus bar is replaced by the first cell and the first conductive structure, so that the light receiving area can be effectively increased, and the conversion efficiency of the solar cell module is effectively improved.

Drawings

FIG. 1 is a schematic illustration of a cross-section of a solar cell module according to an embodiment of the invention;

fig. 2 is a schematic diagram of a plan view of a cell sheet with a positive electrode and a negative electrode on a backlight side according to an embodiment of the invention;

FIG. 3 is a schematic illustration of a plan view of another cell sheet with a positive electrode and a negative electrode on the backlight side according to an embodiment of the invention;

FIG. 4 is a schematic diagram of a plan view of yet another cell sheet with a positive electrode and a negative electrode on its backlight side according to an embodiment of the invention;

fig. 5 is a schematic structural diagram of a battery string according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a first conductive structure according to an embodiment of the invention;

FIG. 7 is a schematic diagram of a first conductive structure according to another embodiment of the present invention;

FIG. 8 is a schematic diagram of a first conductive structure according to yet another embodiment of the present invention;

fig. 9 is a schematic diagram of a first conductive structure relative to a first cell according to an embodiment of the invention;

fig. 10 is a schematic diagram of a first conductive structure relative to a first cell according to yet another embodiment of the invention;

fig. 11 is a schematic diagram of a first conductive structure according to another embodiment of the invention in relation to a first cell sheet;

fig. 12 is a schematic structural diagram of a battery string according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a second conductive structure according to an embodiment of the invention;

FIG. 14 is a schematic diagram of a second conductive structure according to another embodiment of the present invention;

fig. 15 is a schematic diagram of a relative position relationship between a second battery piece and a second conductive structure according to an embodiment of the invention;

fig. 16 is a schematic diagram of a relative position relationship between a second battery piece and a second conductive structure according to another embodiment of the invention;

fig. 17 is a schematic structural view of a battery string according to another embodiment of the present invention;

fig. 18 is a schematic view of a partial structure of a solar cell module according to an embodiment of the present invention;

fig. 19 is a schematic view of a partial structure of a solar cell module according to still another embodiment of the present invention;

fig. 20 is a schematic view of a partial structure of a solar cell module according to another embodiment of the present invention;

fig. 21 is a schematic view of a partial structure of a solar cell module according to still another embodiment of the present invention;

fig. 22 is a schematic view of a partial structure of a solar cell module according to another embodiment of the present invention;

fig. 23 is a schematic view of a partial structure of a solar cell module according to still another embodiment of the present invention;

fig. 24 is a schematic view of a partial structure of a solar cell module according to still another embodiment of the present invention;

FIG. 25 is a schematic view of a first conductive structure disposed on a backplane according to an embodiment of the present invention;

FIG. 26 is a schematic view of a first conductive structure being distributed on a backplane according to another embodiment of the present invention;

FIG. 27 is a schematic view of a first conductive structure being distributed on a backplane according to yet another embodiment of the present invention;

FIG. 28 is a schematic diagram of a portion of a second conductive structure according to another embodiment of the present invention;

FIG. 29 is a schematic view of a plurality of second conductive structures disposed side-by-side on a backplane according to an embodiment of the present invention;

FIG. 30A is a schematic structural diagram of an insulating layer according to an embodiment of the invention;

FIG. 30B is a schematic diagram of an insulating layer according to another embodiment of the invention;

fig. 31 is a structural sectional view showing the relative positional relationship between a first battery cell and a first conductive structure according to an embodiment of the present invention;

fig. 32A is a cross-sectional view of the structure showing the relative positional relationship of the first cell, the third cell at one end of the battery string, and the first conductive structure, in accordance with one embodiment of the present invention;

fig. 32B is a structural sectional view showing a relative positional relationship between the first cell piece, the third cell piece at one end of the cell string, and the first conductive structure, according to another embodiment of the present invention;

fig. 33 is a schematic view of a partial structure of a solar cell module according to another embodiment of the present invention;

fig. 34 is a schematic view of a partial structure of a solar cell module according to still another embodiment of the present invention;

fig. 35 is a main flowchart of a method for manufacturing a solar cell module according to an embodiment of the present invention.

The reference numbers are as follows:

1 solar cell module

10, 10' battery string group

11 first battery piece

111 positive electrode of first cell

112 negative electrode of first cell

12 one battery string in the battery string group

121 a second cell included in the battery string

122 third battery piece comprised by one battery string

Another battery string in the 12' battery string group

12' 1 another battery string comprises a second battery piece

12' 2 another battery string comprises a third battery piece

13 fourth battery piece

20 first conductive structure

21 the first conductive structure comprises a first conductive region

211 belongs to the first conductive area and is electrically connected with the positive electrode of the first cell

212 belonging to the first conductive region and electrically connected to the negative electrode at one end of the battery string

22 the first conductive structure comprises a second conductive region

221 a region belonging to the first conductive region and electrically connected with the negative electrode of the first cell

222 belongs to the first conductive region and is electrically connected with the positive electrode at one end of another cell string

23 first conductive structure comprising a conductive layer

231 one edge of the conductive layer

2311 an edge portion of one edge of the conductive layer

2312 another edge portion of one edge of the conductive layer

24 isolation trenches comprised by the first conductive structure

30 back plate

40 diode

50 second conductive structure

51 third conductive region

52 fourth conductive region

53, 53' the second cell in a string of cells covers the area of the second conductive structure

54, 54' the second cell in the other string overlies a region of the second conductive structure

55 the area covered by the solder strip or the conductive adhesive of the third battery piece connected with the second battery piece in the battery string in series

56 the third battery piece connected with the second battery piece in another battery string is covered by a welding strip or conductive adhesive

60 insulating layer

61 through hole provided on the insulating layer

70 third conductive structure

80 tie layer

90 series group

100 encapsulation layer

110 cover plate

Detailed Description

The following description is made in detail.

Referring to fig. 1, 18 to 24, 33 and 34, a solar cell module 1 according to an embodiment of the invention may include: a battery string 10, a first conductive structure 20, and a back plate 30, wherein,

the battery string set 10 includes a first battery piece 11 and two battery strings 12, 12', wherein a backlight surface of the first battery piece 11 has a positive electrode and a negative electrode;

the first conductive structure 20 is disposed on the back plate 30, the first conductive structure 20 includes a first conductive region 21 and a second conductive region 22, wherein the first conductive region 21 is electrically isolated from the second conductive region 22;

the first cell piece 11 covers the first conductive structure 20, so that the positive electrode 111 and the negative electrode 112 are electrically connected with the first conductive region 21 and the second conductive region 22 respectively;

the two battery strings 12, 12 'are electrically connected to the first conductive region 21 and the second conductive region 22, respectively, so that the two battery strings 12, 12' are connected in series through the first cell 11 and the first conductive structure 20.

The first cell 11 may be a cell with a back-light surface having a positive electrode 111 and a negative electrode 112 as shown in fig. 2, fig. 3 and fig. 4, and in a preferred embodiment, the first cell is a back-contact solar cell. Fig. 2 to 4 are schematic structural diagrams of the backlight surface of the first battery piece 11. The backlight surface of the first cell 11 generally refers to a main surface that cannot receive direct irradiation of incident light, and the backlight surface of the first cell 11 is opposite to the back plate. It should be noted that fig. 2 to fig. 4 only show the structure of the first cell, and other back contact solar cells may also be used as the first cell, but it is required to ensure that the first conductive structure matches with the structure of the first cell.

It is worth noting that the two battery strings 12, 12 'may include at least one third battery piece 122, 12' 2. In a preferred embodiment, the two battery strings 12, 12 'may include a plurality of third battery pieces 122, 12' 2. The third cell may be a back contact solar cell, or may be a cell in which electrodes (positive electrode and negative electrode) having opposite polarities are respectively disposed on the light receiving surface and the backlight surface (for example, a cell in which a positive electrode is disposed on the light receiving surface and a negative electrode is disposed on the backlight surface). Wherein, the series connection between the plurality of third battery pieces can be realized by a shingle mode or a welding strip connection mode.

The battery string set 10 obtained based on the first battery piece 11 and the two battery strings 12 and 12 'can be as shown in fig. 5, because the series connection between the first battery piece 11 and the two battery strings 12 and 12' is realized by the first conductive structure 20 shown in fig. 6, 7 and 8, wherein the layout of the first conductive region 21 and the second conductive region 22 in the first conductive structure shown in fig. 6 corresponds to the first battery piece shown in fig. 2, the layout of the first conductive region 21 and the second conductive region 22 in the first conductive structure shown in fig. 7 corresponds to the first battery piece shown in fig. 3, and the layout of the first conductive region 21 and the second conductive region 22 in the first conductive structure shown in fig. 8 corresponds to the first battery piece shown in fig. 2 or fig. 4. Since the first conductive structure 20 does not block the light receiving surface of the first cell 11 and the light receiving surfaces of the cells included in the two cell strings 12 and 12', the light receiving surface area of the solar cell can be effectively increased by connecting the first conductive structure 20 and the first cell 11 in series in the embodiment of the present invention, compared with the conventional solar cell connected in series by the bus bar, so that the conversion efficiency of the solar cell module can be effectively improved.

It should be noted that, as shown in fig. 6 to 8, which are plan views of the first conductive structure 20 exemplarily shown in fig. 6 to 8, the first conductive structure 20 includes a first conductive region 21 and a second conductive region 22, wherein the first conductive region 21 is electrically isolated from the second conductive region 22 by filling an insulating layer at an interface between the first conductive region and the second conductive region, or by providing an isolation trench 24 at an interface between the first conductive region and the second conductive region (as shown in fig. 6 to 8), that is, by providing the isolation trench 24 on the conductive layer 23, the first conductive region 21 and the second conductive region 22 can be obtained. The conductive layer 23 can be a conductive metal sheet, and since the conductive property of the conductive metal sheet is good, the cost is low, and the process of providing the isolation groove on the conductive metal sheet is mature, the manufacturing cost and the production efficiency of the first conductive structure can be effectively controlled while the stability of the manufacturing process of the first conductive structure is ensured, so that the stability and the feasibility of the production process of the solar cell module in the embodiment of the application are ensured.

It should be noted that, the two battery strings electrically connecting the first conductive region 21 and the second conductive region 22 respectively may be, as shown in fig. 9 to 11, in the first conductive structure 20, the first conductive region 21 and the second conductive region 22 respectively have

regions

211 and 221 contacting the first cell piece 11 (for example, in the

regions

211 and 221, the region 211 belonging to the first conductive region 21 is electrically connected to the positive electrode 111 of the first cell piece 11, and the region 221 belonging to the second conductive region 22 is electrically connected to the negative electrode 112 of the first cell piece 11), and a region 212 in contact with one of the battery strings 12 (e.g., the region 212 is electrically connected to a negative electrode at one end of one of the battery strings 12), and a region 222 in contact with another of the battery strings 12' (e.g., the region 222 is electrically connected to a positive electrode at one end of another of the battery strings 12). The electrical connection between the

regions

211 and 221 of the first conductive region 21 and the second conductive region 22 and the positive electrode and the negative electrode of the first cell 11 is determined by how the positive electrode and the negative electrode of the first cell 11 are respectively matched with or correspond to the

regions

211 and 221. The above-described embodiments are merely exemplary in showing the electrical connection corresponding to the first battery sheet shown in fig. 2 to 4. The layouts of the first and second

conductive regions

21 and 22 exemplarily illustrated by the above-described fig. 6 and 9 correspond to the positive and

negative electrode

111 and 112 distributions of the first cell piece 11 illustrated in fig. 2, the layouts of the first and second

conductive regions

21 and 22 exemplarily illustrated by fig. 7 and 10 correspond to the positive and

negative electrode

111 and 112 distributions of the first cell piece 11 illustrated in fig. 3, and the layouts of the first and second

conductive regions

21 and 22 exemplarily illustrated by fig. 8 and 11 correspond to the positive and

negative electrode

111 and 112 distributions of the first cell piece 11 illustrated in fig. 4. The series connection in the cell string group can be realized only by correspondingly arranging the first cell and the two cell strings with the first conductive structure respectively (namely covering the first cell, the negative electrode at one end of one cell string and the positive electrode at one end of the other cell string on corresponding areas on the first conductive structure), so that the manufacturing process of the solar cell module is effectively simplified, and the production of the solar cell module is more efficient.

In addition, as shown in fig. 6 and 7, one edge 231 of the conductive layer 23 is cut into two

edge portions

2311, 2312 by the isolation groove 24, wherein the edge 231 is adjacent to the two battery strings 12, 12'; the two

edge portions

2311, 2312 belong to the first conductive area 21 and the second conductive area 22, respectively.

It should be noted that, in order to further ensure the stability of the operation of the solar cell module and reduce the risk of hot spots, as shown in fig. 5, in one cell group, the other end of one cell string 12 and the other end of another cell string 12' may be connected by a solder strip and connected in parallel with a diode 40.

In addition, the electrically connecting the first conductive region 21 and the second conductive region 22 at one end of one battery string 12 and one end of the other battery string 12' may specifically be: the negative electrode at one end of one cell string 12 is connected to the region 212 in the first conductive region 21 by a solder ribbon or conductive paste, and the positive electrode at one end of the other cell string 12' is connected to the region 222 in the second conductive region 22 by a solder ribbon or conductive paste. Here, the region 212 in the first conductive region 21 includes one edge portion 2311, and the region 222 in the second conductive region 22 includes the other edge portion 2312.

In an embodiment of the present invention, as shown in fig. 12, each battery string 12/12' may include: a second cell sheet 121/12' 1, wherein,

the second cell 121/12 ' 1 is disposed at the other end of the battery string 12/12 ', and the backlight surface of the second cell 121/12 ' 1 has a positive electrode and a negative electrode. That is, the second cell piece can also be a back contact solar cell piece, such as the cell pieces shown in fig. 2 to 4. The connection between the other ends of the two battery strings and the diode can be obtained through the second conductive structure arranged on the back plate, correspondingly, the diode can be arranged on the second conductive structure, and the diode can also be connected to the third conductive area and the fourth conductive area of the second conductive structure through the conductive adhesive, so that the parallel arrangement of the diode and the battery string group is realized. The bus bar is further removed, thereby further improving the conversion efficiency of the solar cell module.

For the second cell at the other end of one cell string 12 being in the structure of the cell shown in fig. 2, and the second cell at the other end of the other cell string 12' being in the structure corresponding to the cell structure shown in fig. 2 (i.e. the structure shown in fig. 2 is two rows of negative electrodes and one row of positive electrodes, and the structure opposite to the cell structure shown in fig. 2 is the corresponding row of negative electrodes and two rows of positive electrodes), correspondingly, the second conductive structure 50 may be as shown in fig. 13 and 14, and the second conductive structure 50 may include: a third conductive region 51 and a fourth conductive region 52, wherein the third conductive region 51 is electrically isolated from the fourth conductive region 52; the second cell pieces of the two cell strings 12 and 12' in the cell string set 10 are covered on the second conductive structure 50, and the cell string set 10 is connected in series through the third conductive region 51 and the fourth conductive region 52. Specifically, as shown in fig. 15 (fig. 15 corresponds to fig. 13) or fig. 16 (fig. 16 corresponds to fig. 14), the second cell in one cell string 12 covers a region 53 shown in fig. 15 or fig. 16, and the second cell in the other cell string 12 ' covers a region 54 shown in fig. 15 or fig. 16, wherein an intersecting region of the third conductive region 51 and the region 53 covered by the one cell string 12 shown in fig. 15 or fig. 16 is a region where a negative electrode corresponding to the cell shown in fig. 2 is located, an intersecting region of the fourth conductive region 52 and the region 53 covered by the one cell string 12 shown in fig. 15 or fig. 16 is a region where a positive electrode corresponding to the cell shown in fig. 2 is located, and accordingly, an intersecting region of the third conductive region 51 and the region 54 covered by the other cell string 12 ' shown in fig. 15 or fig. 16 is a region where a positive electrode corresponding to the second cell belonging to the other cell string 12 ' is located, the intersecting region of the fourth conductive region 52 and the region 54 covered by the other battery string 12 'shown in fig. 15 or fig. 16 is the region where the negative electrode corresponding to the second cell of the other battery string 12' is located. Accordingly, the positive electrode of the third cell connected in series with the second cell covering the area 53 on the cell string 12 can be connected in series by covering the area 55 shown in fig. 15 or fig. 16 with a solder or conductive adhesive, and the negative electrode of the third cell connected in series with the second cell covering the area 54 on the other cell string 12' can be connected in series by covering the area 56 shown in fig. 15 or fig. 16 with a solder or conductive adhesive.

In the embodiment of the present invention, as shown in fig. 17, a fourth cell 13 may be further disposed at the other end of one cell string 12 and the other end of another cell string 12 ', the backlight surface of the fourth cell 13 has a positive electrode and a negative electrode, and the positive electrode and the negative electrode of the fourth cell 13 are respectively connected to the one cell string 12 and the another cell string 12' to form a series connection of the cell string set 10. The battery string including the fourth cell is connected in parallel with a diode 40. The third conductive structure (not shown in the figure) used in the fourth cell 13 may be the same as or similar to the first conductive structure, or may also be a modification of the first conductive structure, that is, the third conductive structure used in the fourth cell 13 may be adjusted according to the layout of the positive electrode and the negative electrode of the fourth cell 13.

In the embodiment of the present invention, as shown in fig. 18 to 24, in the partial structure of the solar cell module, the solar cell module 1 may include a plurality of cell string sets 10, and the plurality of cell string sets 10 are connected in series and/or in parallel. The third cell in the cell string in the solar cell module shown in fig. 18 is connected in series by a solder strip or a conductive adhesive, and a plurality of cell string groups are connected in series to form a series group; in the solar cell module shown in fig. 19, the third cells in the cell string are connected in series in a shingled manner, and a plurality of cell string groups are connected in series to form a series group; fig. 20 is an electrical diagram corresponding to fig. 18 and 19.

In the embodiment of the present invention, as shown in fig. 18 and 19, the number of battery string groups is plural, and at least two battery string groups connected in series are arranged side by side to form one series group.

In the embodiment of the present invention, as shown in fig. 21 and 23, two series groups 90 included in the solar cell module 1 may be arranged in parallel, wherein the cell string groups 10 and 10 'in the two series groups 90 connected in parallel are arranged in a one-to-one correspondence manner, one end of one cell string group 10 of the two correspondingly arranged cell string groups 10 and 10' corresponds to one end of the other cell string group 10 ', and the two correspondingly arranged cell string groups 10 and 10' share the same diode. In a preferred embodiment, the two battery strings 10 and 10' are electrically connected to the second conductive structure. Through the structure, the requirements of users on the voltage and the current of different solar cell modules can be met, and the solar cell modules have assembly flexibility. In addition, the battery string groups are correspondingly arranged, so that the current and voltage balance of the solar battery assembly can be ensured, and the working stability is ensured. In addition, the structure ensures the working stability of the solar cell module, and reduces the use of diodes at the same time, so as to effectively reduce the cost of the solar cell module. Fig. 21, 22, 23 and 24 are schematic structural diagrams illustrating a plurality of battery string sets connected in series to form a series set 90 and two series sets 90 connected in parallel, wherein in fig. 21 to 24, two battery string sets 90 corresponding to each other in the upper and lower directions are connected in parallel and arranged in the left and right directions are connected in series to form a series set, fig. 21 and 22 illustrate that one end of a battery string 12 and one end 12' of another battery string in a battery string set 10 are connected in series through a first battery piece 11 and a first conductive structure 20, and fig. 22 is a schematic electrical structural diagram of fig. 21; fig. 23 and 24 show that one end of a cell string 12 in the cell string set 10 and one end of another cell string 12 ' are connected in series through the first cell 11 and the first conductive structure 20, the other end of the cell string 12 in the cell string set 10 is connected in series with the second cell 121, the other end of the another cell string 12 ' is connected in series with the second cell 12 ' 1 (the second cell 121 connected in series at the other end of the cell string 12 and the second cell 12 ' 1 connected in series at the other end of the another cell string 12 ' may be back contact solar cells), and fig. 24 is an electrical structure schematic diagram of fig. 23. As can be seen from the above solar cell modules with different structures, the solar cell module provided by the embodiment of the present invention can meet different requirements, and can be adjusted accordingly according to different requirements, so that the solar cell module provided by the embodiment of the present invention has wide practicability and flexibility in use.

It should be understood that fig. 18 to 24 are only schematic structural diagrams of a portion of the solar cell module, and various portions of the solar cell module may be further connected by the provided connector.

The structure and distribution of the first conductive structures 20 disposed on the back sheet 30 corresponding to the partial structure of the solar cell module shown in fig. 18 and 19 can be as shown in fig. 25 (i.e., the first conductive structures 20 shown in fig. 6 are disposed on the back sheet). It is understood that fig. 25 is only an exemplary structure, for example, fig. 7 and 8 may be disposed on a back plate, the structures shown in fig. 6, 7 and 8 or a similar structure combination may be disposed on a back plate, and the like.

The structure and distribution of the first conductive structures 20 disposed on the back sheet 30 corresponding to the partial structure of the solar cell module shown in fig. 21 can be as shown in fig. 26 (i.e., the first conductive structures 20 shown in fig. 6 are disposed on the back sheet). It is understood that fig. 26 is only an exemplary structure, for example, fig. 7 and 8 may be disposed on a back plate, the structures shown in fig. 6, 7 and 8 or a similar structure combination may be disposed on a back plate, and the like.

Fig. 27 shows the structure and distribution of the first conductive structures 20 disposed on the back sheet 30 corresponding to the partial structure of the solar cell module shown in fig. 23, and it can be seen from fig. 27 that one second conductive structure 50 can be shared between the cell string sets 10 and 10' correspondingly disposed in the two parallel series sets 90. It is understood that the second conductive structure 50 shown in fig. 27 and fig. 27 is only an exemplary structure, for example, a modification of the second conductive structure 50 shown in fig. 27, fig. 7 and fig. 8 may be disposed on the back plate, the structures shown in fig. 6, fig. 7 and fig. 8 or a similar structure may be disposed on the back plate in combination, the battery strings in the parallel series group 90 may be respectively configured with the respective second conductive structures, and the like. Among them, a partial structure applied to the second conductive structure 50 shown in fig. 27 may be as shown in fig. 28. As shown in fig. 28, for two corresponding battery string groups 10 and 10' of the two parallel battery string groups 90, the second cell of one battery string in one battery string group 10 covers the region 53, and the second cell of the other battery string covers the region 54; the second cell of one cell string in the other cell string group 10 ' is covered in the region 53 ', and the second cell of the other cell string is covered in the region 54 '. It should be noted that fig. 28 is only an exemplary structure, and other structures capable of corresponding to the electrode on the second cell piece are also within the protection scope of the present invention, such as a modification or splicing of the structure of fig. 13 or fig. 14. For another example, fig. 29 shows a plurality of second conductive structures 50 disposed side by side on the back plate to satisfy the parallel connection requirement (for example, the structure shown in fig. 29 can be used to connect the battery strings shown in fig. 12 in parallel and in series).

In summary, the solar cell module provided by the embodiment of the invention has various combination modes to meet different requirements.

In addition, in addition to the above-described structures of several solar cell modules, a plurality of cell string groups shown in fig. 17 may be connected in series or in parallel, and in addition, cell string groups of different structures may be connected in series or in parallel. In a preferred embodiment, in order to maintain the stability of the solar cell module, the structure of all cell string sets in the solar cell module is the same or consistent.

In the embodiment of the present invention, the solar cell module 1 may further include: an insulating layer 60, and a third conductive structure 70, wherein,

as shown in fig. 30A and 30B, the insulating layer 60 is provided with a through hole 61, wherein the through hole 61 matches with the positive electrode 111 of the first cell piece 11 and the negative electrode 112 of the first cell piece 11; fig. 30A is a plan view of the insulating layer 60, and fig. 30B is a cross-sectional view of the insulating layer 60.

As shown in fig. 31, the third conductive structure 70 passes through the through hole 61, one end of the third conductive structure 70 is connected to the first cell 11 (the connection to the first cell is substantially connected to the positive electrode 111 or the negative electrode 112 in the first cell), and the other end of the third conductive structure 70 is connected to the first conductive structure 20 (the connection to the first conductive structure is substantially connected to the first conductive region or the second conductive region in the first conductive structure). Through this insulating layer and through-hole structure, on the one hand can guarantee first battery piece electric connection first conductive structure, and on the other hand can reduce the area of contact between first battery piece and the first conductive structure to improve solar module's performance effectively.

As shown in fig. 32A and 32B, in addition to fig. 32, a cross-sectional view of the third cell piece 122 at one end of the cell string is connected by a solder ribbon or a conductive adhesive.

The first conductive structure 20 and/or the second conductive structure 50 are disposed on the back plate 30, a bonding layer is disposed between the first conductive structure 20 and/or the second conductive structure 50 and the back plate 30, the first conductive structure is bonded on the back plate through the bonding layer, the first conductive structure 20 and/or the second conductive structure 50 can be directly disposed on the back plate, an encapsulation adhesive film is disposed between the back plate and the battery string, and an overlapped portion of the encapsulation adhesive film and the first conductive structure and/or the second conductive structure 50 is hollowed out, so that the first conductive structure and/or the second conductive structure 50 is electrically connected with the battery piece.

In a preferred embodiment, as shown in fig. 33, the solar cell module 1 may further include: and an adhesive layer 80, wherein the adhesive layer 80 is disposed between the first conductive structure 20 and the back plate 30, and is used for adhering the first conductive structure 20 to the back plate. I.e. the first conductive structure 20 is arranged on the back plate by means of an adhesive layer. The stability of the first conductive structure can be ensured by providing this adhesive layer.

The bonding layer can be used for bonding the first conductive structure on the back plate and can also be used for packaging the solar cell module. In addition, in the process of laminating the solar cell module, the bonding layer can buffer the first conductive structure, the second conductive structure and the like for the most use, so that the first conductive structure and the second conductive structure are prevented from being crushed, and the production yield of the solar cell module is ensured.

It is understood that the first conductive structure and the second conductive structure can be etched out of the same piece of copper foil or copper film bonded to the back plate, and accordingly, the bonding layer is disposed between the copper foil or copper film and the back plate.

It is worth mentioning that the region between the battery string and the back plate, which is not covered by the first conductive structure and/or the second conductive structure, is also filled with the adhesive layer.

In an embodiment of the present invention, as shown in fig. 33, the solar cell module 1 may further include: and a through hole disposed on the back sheet 30, the through hole being connected to the first conductive structure 20 by filling a conductive adhesive (third conductive structure 70) to guide electric energy of the solar cell module to the outside.

In an embodiment of the present invention, as shown in fig. 1 and 34, the solar cell module 1 may further include: a cover plate 110 and an encapsulation layer 100, wherein the encapsulation layer 100 is filled between the battery string assembly 10 and the cover plate 110.

In addition, it is worth to be noted that the encapsulating layer may be filled in a gap between the battery pieces in the battery string group, a gap between the battery string group and the back plate, or the like, so as to tightly encapsulate the battery string group between the back plate and the cover plate.

The embodiment of the invention provides a preparation method of a solar cell module. As shown in fig. 35, the method for manufacturing the solar cell module may include the steps of:

s3501: a step of laying a first conductive structure on the back plate;

s3502: covering a first battery piece on the first conductive structure;

s3503: and electrically connecting the two battery strings with the first conductive structure respectively.

The solar cell module provided by each embodiment can be prepared by the preparation method.

In the step of laying the first conductive structure on the backplane, the first conductive structure may include a first conductive region and a second conductive region, wherein the first conductive region is electrically isolated from the second conductive region; the first conductive structure may be constructed from a metallic conductive sheet, such as copper foil or the like.

In step S3502, the backlight surface of the first cell piece has a positive electrode and a negative electrode, for example, the first cell piece may be a back contact solar cell piece, so that the positive electrode and the negative electrode of the first cell piece are electrically connected to the first conductive region and the second conductive region, respectively.

Wherein, step S3503 may specifically be: and electrically connecting the positive electrode at one end of one battery string and the negative electrode at one end of the other battery string in the two battery strings with the first conductive region and the second conductive region respectively so as to enable the two battery strings to be connected in series through the first battery piece and the first conductive structure.

The first battery piece and the first conductive structure are used for replacing a bus bar in the prior art, on one hand, the first battery piece covers the first conductive structure, the light receiving surface of the first battery piece is not shielded, and on the other hand, the bus bar is replaced by the first battery piece and the first conductive structure, so that the light receiving area can be effectively increased, and the conversion efficiency of the solar battery assembly is effectively improved.

In an embodiment of the present invention, in a case where each cell string includes a second cell, the method for manufacturing a solar cell module may further include: and laying a second conductive structure on the back plate. The second battery piece is arranged at the other end of the battery string, and a backlight surface of the second battery piece is provided with a positive electrode and a negative electrode.

The second conductive structure laid on the back plate can comprise a third conductive area and a fourth conductive area, wherein the third conductive area is electrically isolated from the fourth conductive area; the second battery pieces of the two battery strings in the battery string group are covered on the second conductive structure, and the battery string group is connected in series through the third conductive area and the fourth conductive area. The second conductive structure may be constructed from a metallic conductive sheet such as copper foil or the like.

In order to clearly illustrate the solar cell module, several specific examples are described below.

Each embodiment includes a cover plate, a packaging adhesive film (packaging layer), a battery string set, a first conductive structure, a bonding layer, and a back plate. No further description is given in the following embodiments, and only different parts of each structure or material are given in the following embodiments.

Example 1:

the cover plate is made of photovoltaic glass; the packaging adhesive film (packaging layer) is an EVA adhesive film; the battery string group comprises a back contact solar cell and two battery strings, wherein the battery strings are formed by connecting 10 full-sheet cells in series through welding strips, the back contact solar cell is equivalent to the working current (Impp) of the full-sheet cells, and the mixed gear current limiting phenomenon cannot occur; an insulating layer is arranged between the whole battery piece and the first conductive structure, the insulating layer is an integrated insulating layer, and the conductive backboard is a white backboard.

As shown in fig. 25, the first conductive structure laid on the back plate includes a plurality of sets of the first conductive regions and the second conductive regions shown in fig. 6, wherein the first conductive regions are connected to the positive electrodes of the first battery pieces through conductive adhesives, and the second conductive regions are connected to the negative electrodes of the first battery pieces through conductive adhesives; as shown in fig. 32A, the first conductive layer is connected to the negative terminal of one of the cell strings through a solder strip, the second conductive layer is connected to the positive terminal of the other cell string through a solder strip to form a conductive cell string, 3 cell strings are connected in series to form a complete circuit, and finally led out through the end of a conventional bus bar (for connecting a junction box), and the electrical connection diagram is shown in fig. 20, and then the solar cell module is formed through lamination and lamination.

Example 2:

the cover plate is made of photovoltaic glass; the packaging adhesive film is (packaging layer) EVA adhesive film; the battery string group comprises a back contact solar cell and two battery strings, wherein the battery string is formed by connecting 50 1/5 cells in series through conductive adhesive, the working current (Impp) of the back contact solar cell is equivalent to that of 1/5 cells, and the mixed current limiting phenomenon cannot occur; the back panel is a white back panel.

The connection relationship between the cell string and the first conductive structure and the subsequent extraction at the end of the module (for connecting the junction box) by means of a conventional bus bar is the same as in example 1, and then the solar cell module is formed by lamination.

Example 3:

the cover plate is made of photovoltaic glass; the packaging adhesive film (packaging layer) is a POE adhesive film; the insulating layer is a plurality of split insulating layers; the number of the insulating layers is consistent with that of the first battery pieces; the battery string group comprises a back contact solar cell and two battery strings, wherein the battery string is formed by connecting a plurality of half cells in series through welding strips, the working current (Impp) of the back contact solar cell is equivalent to that of the half cells, and the mixed gear current limiting phenomenon cannot occur; the conductive back plate is a transparent back plate.

According to the figure 21, a plurality of cell string groups are connected in series-parallel to form a complete circuit, finally, the complete circuit is led out from the middle of the module through a conventional bus bar (used for connecting a junction box), the electrical connection diagram is shown in figure 22, and then the solar cell module is formed through lamination.

Example 4:

the cover plate is made of photovoltaic glass; the packaging adhesive film (packaging layer) is a POE adhesive film; the insulating layer is a plurality of split insulating layers; the number of the insulating layers is consistent with that of the first battery pieces; the battery string group comprises a back contact solar cell and two battery strings, the battery string consists of a plurality of half cells and a back contact solar cell, the half cells are connected through welding strips, the half cells are connected with a conducting layer for connecting the back contact solar cell through the welding strips to form a complete battery string, wherein the back contact solar cell is equivalent to the working current (Impp) of the half cells, and the mixed gear current limiting phenomenon cannot occur; the conductive back plate is a transparent back plate.

According to the figure 23, a plurality of battery strings are connected in series to form a series group, an upper series group and a lower series group are connected in parallel to form a complete circuit, finally, the whole circuit is led out from the middle of the module through a conventional bus bar (used for connecting a junction box), the electric connection diagram is shown in figure 24, and then the solar battery module is formed through lamination and lamination.

Although the embodiments of the present invention are disclosed above, it is not intended to limit the scope of the present invention, for example, the relationship between two adjacent battery strings and the distribution of the first conductive structure, the second conductive structure, etc. on the back plate, or the first conductive structure, the second conductive structure may be exchanged or combined, etc. Any modification and decoration made without departing from the spirit and scope of the present application shall fall within the protection scope of the present application.

Claims

1. A solar cell module, comprising: a battery string (10), a first conductive structure (20), and a back plate (30), wherein,

the battery string group (10) comprises a first battery piece (11) and two battery strings (12, 12'), wherein a backlight surface of the first battery piece (11) is provided with a positive electrode (111) and a negative electrode (112);

the first conductive structure (20) is disposed on the backplane (30), the first conductive structure comprising a first conductive region (21) and a second conductive region (22), wherein the first conductive region (21) is electrically isolated from the second conductive region (22);

the first battery piece (11) covers the first conductive structure (20), so that the positive electrode (111) and the negative electrode (112) are respectively and electrically connected with the first conductive region (21) and the second conductive region (22);

the two battery strings (12, 12 ') are electrically connected to the first conductive region (21) and the second conductive region (22), respectively, so that the two battery strings (12, 12') are connected in series through the first cell sheet (11) and the first conductive structure (20).

2. The solar cell module as claimed in claim 1,

the first conductive structure (20) comprises a conductive layer (23) and an isolation trench (24), wherein,

the isolation trench (24) is used for isolating the conductive layer from the first conductive region (21) and the second conductive region (22).

3. The solar cell module according to claim 1 or 2,

the layout of the first conductive region (21) and the second conductive region (22) corresponds to the distribution of the positive electrode (111) and the negative electrode (112) of the first battery piece (11).

4. The solar cell module as claimed in claim 2,

-one edge (231) of the conductive layer (23) is cut into two edge portions (2311, 2312) by the isolation groove (24), wherein the edge (231) is close to the two battery strings (12, 12');

said two edge portions (2311, 2312) belong to said first conductive area (21) and to said second conductive area (22).

5. The solar cell module as claimed in claim 4,

one end of one of the battery strings (12) and one end of the other battery string (12') are electrically connected to one of the edge portions (2311) and the other edge portion (2312), respectively.

6. The solar cell assembly of claim 1, wherein each of the cell strings comprises: a second cell piece, wherein,

7. The solar cell assembly of claim 6, further comprising: a second conductive structure (50), wherein,

the second conductive structure (50) includes: a third conductive region (51) and a fourth conductive region (52), wherein the third conductive region (51) is electrically isolated from the fourth conductive region (52);

the second battery pieces of the two battery strings (12, 12') in the battery string group (10) are covered on the second conductive structure (50), and the battery string group (10) is connected in series through the third conductive region (51) and the fourth conductive region (52).

8. The solar cell module according to any one of claims 1, 2, 4 to 7,

the number of the battery string groups (10) is multiple, and the battery string groups (10) are connected in series and/or in parallel.

9. The solar cell module as claimed in any one of claims 1, 2 and 4 to 7, further comprising: an insulating layer (60) and a third conductive structure (70), wherein,

a through hole (61) is formed in the insulating layer (60), wherein the through hole is matched with a positive electrode (111) of the first battery piece (11) and a negative electrode (112) of the first battery piece (11);

the third conductive structure (70) penetrates through the through hole (61), one end of the third conductive structure (70) is connected with the first battery piece (11), and the other end of the third conductive structure (70) is connected with the first conductive structure (20).

10. The method for producing a solar cell module according to any one of claims 1 to 9, comprising:

-laying a first conductive structure (20) on a back plate (30), the first conductive structure comprising a first conductive area (21) and a second conductive area (22), wherein the first conductive area is electrically isolated from the second conductive area;

covering a first battery piece (11) on the first conductive structure (20), wherein a backlight surface of the first battery piece (11) is provided with a positive electrode (111) and a negative electrode (112), and the positive electrode (111) and the negative electrode (112) are respectively electrically connected with the first conductive region (21) and the second conductive region (22);

electrically connecting two battery strings (12, 12 ') to the first conductive region (21) and the second conductive region (22), respectively, to connect the two battery strings (12, 12') in series via the first cell (11) and the first conductive structure (20).