阅读说明：本技术 光伏组件 (Photovoltaic module ) 是由 许涛 邓士锋 于 2020-11-02 设计创作，主要内容包括：本发明公开了一种光伏组件,所述光伏组件包括：多个电池片,每个电池片包括电池片本体和多个栅线,多个所述栅线彼此间隔开地设在所述电池片本体上；多个互连结构件,多个互连结构件沿栅线的长度方向间隔排布,每个互连结构件沿多个栅线的排布方向延伸,每个互连结构件与多个栅线均电连接,每个互连结构件通过至少一个导电粘结件与电池片粘接,每个导电粘结件由含有镍颗粒、镍包碳颗粒、银包镍颗粒、银包碳颗粒、银包铝颗粒和银包铜颗粒中的至少一种的导电浆料制成。根据本发明的光伏组件,可以有效提高互连结构件与电池片之间的连接牢靠性,且可以减小电阻,有利于电流的输出,还可以有效降低整个光伏组件例如异质结组件的成本。(The invention discloses a photovoltaic module, which comprises: the solar cell comprises a plurality of solar cells, a plurality of solar cells and a plurality of grid lines, wherein each solar cell comprises a solar cell body and a plurality of grid lines; the solar cell comprises a plurality of interconnection structural members, wherein the interconnection structural members are arranged at intervals along the length direction of grid lines, each interconnection structural member extends along the arrangement direction of the grid lines, each interconnection structural member is electrically connected with the grid lines, each interconnection structural member is bonded with a cell piece through at least one conductive bonding member, and each conductive bonding member is made of conductive slurry containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles and silver-coated copper particles. According to the photovoltaic module, the connection firmness between the interconnection structural member and the cell can be effectively improved, the resistance can be reduced, the current output is facilitated, and the cost of the whole photovoltaic module such as a heterojunction module can be effectively reduced.)

1. A photovoltaic module, comprising:

the solar cell comprises a plurality of solar cells, a plurality of solar cells and a plurality of grid lines, wherein each solar cell comprises a solar cell body and a plurality of grid lines;

the solar cell comprises a plurality of grid lines, a plurality of interconnection structural members, a plurality of solar cells and a plurality of conductive adhesive members, wherein the interconnection structural members are arranged at intervals along the length direction of the grid lines, each interconnection structural member extends along the arrangement direction of the grid lines, each interconnection structural member is electrically connected with the grid lines, each interconnection structural member is adhered to the cell through at least one conductive adhesive member, and each conductive adhesive member is made of conductive paste containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles and silver-coated copper particles.

2. The photovoltaic module of claim 1,

when the conductive bonding piece is made of conductive slurry containing silver-coated nickel particles or silver-coated copper particles, the mass percentage of the silver is 15-25%;

when the conductive adhesive member is made of conductive slurry containing nickel-coated carbon particles, the mass ratio of nickel is 60-75%.

3. The photovoltaic module of claim 1, wherein each of the grid lines is made of a conductive paste containing at least one of nickel particles, nickel-on-carbon particles, silver-on-nickel particles, silver-on-carbon particles, silver-on-aluminum particles, and silver-on-copper particles.

4. The photovoltaic module of claim 3,

when the grid line is made of conductive paste containing silver-coated nickel particles or silver-coated copper particles, the mass percentage of the silver is 15-25%;

when the grid line is made of conductive paste containing nickel-coated carbon particles, the mass ratio of nickel is 60-75%.

5. The photovoltaic module of claim 3, wherein the grid line is made of the same material as the conductive adhesive.

6. The photovoltaic assembly of any of claims 1-5, wherein at least one of the conductive adhesives is connected between the interconnecting structural member and the corresponding grid line.

7. The assembly defined in claim 6, wherein the conductive adhesive has a height that is less than or equal to the height of the grid lines when the conductive adhesive is positioned between the interconnect structure and the cell body.

8. The photovoltaic module of any one of claims 1-5 wherein at least one of said conductive adhesives is located between an edge of said cell sheet and an outermost one of said plurality of said gridlines.

9. The assembly defined in claim 8 wherein a plurality of said conductive adhesive members are disposed between each of said interconnecting structural members and said cell sheet, one portion of said plurality of said conductive adhesive members being disposed between an edge of said cell sheet and one side of all of said grid lines and another portion of said plurality of said conductive adhesive members being disposed between an edge of said cell sheet and another side of all of said grid lines.

10. The assembly of claim 8, wherein a plurality of the conductive adhesive members are disposed between each of the interconnecting structural members and the cell sheet, the plurality of conductive adhesive members including at least one first conductive adhesive member and at least one second conductive adhesive member, the first conductive adhesive member being disposed between an edge of the cell sheet and an outermost one of the plurality of grid lines, and the second conductive adhesive member being disposed between two adjacent grid lines.

11. The photovoltaic module of any of claims 1-5, wherein at least one grid line is disposed between two adjacent conductive adhesives along the length of the interconnect structure.

12. The photovoltaic module according to any one of claims 1 to 5, wherein a plurality of the conductive adhesive members are provided between each of the interconnecting structural members and the cell sheet, and a distance between two adjacent conductive adhesive members adjacent to an edge of the cell sheet along a length direction of the interconnecting structural member is smaller than a distance between two adjacent conductive adhesive members located in a middle portion of the cell sheet.

13. The photovoltaic module of any of claims 1-5, wherein each of the conductive adhesives has a width in a length direction of the grid line that is less than or equal to a width of the corresponding interconnecting structural member.

14. The photovoltaic module of any of claims 1-5 wherein the conductive adhesive is printed on the cell sheet; or

The conductive adhesive is coated on the interconnection structure.

15. The photovoltaic module according to any one of claims 1 to 5, wherein a plurality of grid lines are arranged on the front surface and the back surface of each cell body, and the number of the grid lines on the back surface of each cell body is greater than or equal to the number of the grid lines on the front surface of the corresponding cell body.

16. The photovoltaic module of any of claims 1-5, wherein the number of interconnecting structures on the front side of each cell body is N₁The number of the interconnected structural members on the back surface of each battery piece body is N₂Wherein, the N is₁、N₂Respectively satisfy: n is not less than 9₁≤18，9≤N₂≤18。

17. The photovoltaic assembly according to any one of claims 1 to 5, wherein each of the interconnecting structural members comprises a conductive substrate and a solder layer covering at least a portion of the conductive substrate, the solder layer being composed of Sn, Bi and Pb, wherein the Bi content is 5% to 25% and the Sn content is 35% to 55%.

18. The photovoltaic assembly of claim 17, wherein the solder layer has a thickness t, wherein t satisfies: t is more than or equal to 10 mu m and less than or equal to 20 mu m.

19. The photovoltaic module of claim 17, wherein the solder layer has a melting point temperature T, wherein T satisfies: t is more than or equal to 120 ℃ and less than or equal to 145 ℃.

20. The photovoltaic module of any of claims 1-5 wherein the photovoltaic module is a heterojunction module.

Technical Field

The invention relates to the technical field of photovoltaic manufacturing, in particular to a photovoltaic module.

Background

In the manufacture of photovoltaic modules, it is usually necessary to connect a plurality of cells by welding using interconnecting members such as solder ribbons, lay the plurality of cells between glass and a back sheet and connect them in series by using bus bars, and then laminate and frame the cells. In the related art, the contact force between the interconnection structure and the cell sheet is small, so that the reliability of the photovoltaic module is low, and the cost of the photovoltaic module is generally high.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a photovoltaic module, which has low cost and can improve the connection reliability between the interconnection structure and the cell sheet.

A photovoltaic module according to an embodiment of the present invention includes: the solar cell comprises a plurality of solar cells, a plurality of solar cells and a plurality of grid lines, wherein each solar cell comprises a solar cell body and a plurality of grid lines; the solar cell comprises a plurality of grid lines, a plurality of interconnection structural members, a plurality of solar cells and a plurality of conductive adhesive members, wherein the interconnection structural members are arranged at intervals along the length direction of the grid lines, each interconnection structural member extends along the arrangement direction of the grid lines, each interconnection structural member is electrically connected with the grid lines, each interconnection structural member is adhered to the cell through at least one conductive adhesive member, and each conductive adhesive member is made of conductive paste containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles and silver-coated copper particles.

According to the photovoltaic module provided by the embodiment of the invention, the interconnection structural member is bonded with the cell piece through at least one conductive bonding member, and each conductive bonding member is made of the conductive paste containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles and silver-coated copper particles, so that the connection firmness between the interconnection structural member and the cell piece can be effectively improved, and the reliability of the photovoltaic module such as a heterojunction module can be improved. Moreover, the conductive bonding piece has better conductivity, can reduce resistance and is beneficial to current output. In addition, the cost of the conductive adhesive is low, so that the cost of the whole photovoltaic module such as a heterojunction module can be effectively reduced.

According to some embodiments of the present invention, when the conductive adhesive member is made of a conductive paste containing silver-coated nickel particles or silver-coated copper particles, the silver is 15% to 25% by mass; when the conductive adhesive member is made of conductive slurry containing nickel-coated carbon particles, the mass ratio of nickel is 60-75%.

According to some embodiments of the invention, each of the gate lines is made of a conductive paste containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles, and silver-coated copper particles.

According to some embodiments of the present invention, when the gate line is made of a conductive paste containing silver-coated nickel particles or silver-coated copper particles, the silver is 15% to 25% by mass; when the grid line is made of conductive paste containing nickel-coated carbon particles, the mass ratio of nickel is 60-75%.

According to some embodiments of the invention, a material of the gate line is the same as a material of the conductive adhesive.

According to some embodiments of the invention, at least one of the conductive adhesives is connected between the interconnect structure and the corresponding grid line.

According to some embodiments of the invention, when the conductive adhesive member is located between the interconnection structure and the cell body, the height of the conductive adhesive member is less than or equal to the height of the grid line.

According to some embodiments of the invention, at least one of the conductive adhesives is located between an edge of the cell sheet and an outermost one of the plurality of grid lines.

According to some embodiments of the invention, a plurality of the conductive adhesive members are disposed between each of the interconnection structures and the cell sheet, a part of the plurality of the conductive adhesive members is located between the edge of the cell sheet and one side of all the grid lines, and another part of the plurality of the conductive adhesive members is located between the edge of the cell sheet and the other side of all the grid lines.

According to some embodiments of the invention, a plurality of the conductive adhesive members are disposed between each of the interconnection structures and the cell sheet, and the plurality of the conductive adhesive members includes at least one first conductive adhesive member and at least one second conductive adhesive member, the first conductive adhesive member is disposed between the edge of the cell sheet and an outermost one of the grid lines, and the second conductive adhesive member is disposed between two adjacent grid lines.

According to some embodiments of the invention, at least one grid line is arranged between two adjacent conductive adhesives along the length direction of the interconnection structure.

According to some embodiments of the invention, a plurality of the conductive adhesive pieces are arranged between each of the interconnection structural members and the cell sheet, and a distance between two adjacent conductive adhesive pieces adjacent to the edge of the cell sheet along the length direction of the interconnection structural members is smaller than a distance between two adjacent conductive adhesive pieces located in the middle of the cell sheet.

According to some embodiments of the invention, each of the conductive adhesive members has a width in a length direction of the gate line equal to or less than a width of the corresponding interconnection structure member.

According to some embodiments of the invention, the conductive adhesive is printed on the battery sheet; or the conductive adhesive member is coated on the interconnection structure member.

According to some embodiments of the invention, the front surface and the back surface of each cell body are provided with a plurality of grid lines, and the number of the grid lines on the back surface of each cell body is greater than or equal to the number of the grid lines on the front surface of the corresponding cell body.

According to some embodiments of the invention, the number of the interconnection structures on the front surface of each cell body is N₁The number of the interconnected structural members on the back surface of each battery piece body is N₂Wherein, the N is₁、N₂Respectively satisfy: n is not less than 9₁≤18，9≤N₂≤18。

According to some embodiments of the invention, each of the interconnect structures comprises a conductive substrate and a solder layer covering at least a portion of the conductive substrate, the solder layer being comprised of Sn, Bi and Pb, wherein the Bi content is 5% to 25% and the Sn content is 35% to 55%.

According to some embodiments of the invention, the solder layer has a thickness t, wherein t satisfies: t is more than or equal to 10 mu m and less than or equal to 20 mu m.

According to some embodiments of the invention, the solder layer has a melting point temperature T, wherein T satisfies: t is more than or equal to 120 ℃ and less than or equal to 145 ℃.

According to some embodiments of the invention, the photovoltaic component is a heterojunction component.

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 cell sheet of a photovoltaic module according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an interconnect structure with an electrically conductive adhesive attached;

FIG. 3 is a cross-sectional view of the interconnect structure shown in FIG. 2;

fig. 4 is a schematic structural view of a battery cell and a conductive adhesive member according to an embodiment of the present invention;

FIG. 5 is a schematic view of the connection of the cell shown in FIG. 4 to an interconnect structure;

fig. 6 is a cross-sectional view of the cell sheet and interconnect structure shown in fig. 5;

fig. 7 is a schematic structural view of a cell sheet and a conductive adhesive member of a photovoltaic module according to another embodiment of the present invention;

fig. 8 is a schematic view of the connection of the cell shown in fig. 7 to an interconnect structure;

fig. 9 is a cross-sectional view of the cell sheet and interconnect structure shown in fig. 8;

fig. 10 is a schematic structural view of a battery cell according to another embodiment of the present invention;

fig. 11 is a schematic structural view of a battery cell according to still another embodiment of the present invention;

fig. 12 is a schematic view of the composition of the conductive paste according to the embodiment of the present invention.

Reference numerals:

1: a battery piece; 11: a cell body; 12: a gate line;

2: an interconnecting structural member; 21: a conductive base;

22: a solder layer; 3: a conductive adhesive member;

4: conductive particles; 41: a kernel; 42: and (4) coating.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

A photovoltaic module according to an embodiment of the present invention is described below with reference to fig. 1 to 12. The photovoltaic module can be a heterojunction (a special PN junction formed by sequentially depositing more than two layers of different semiconductor material films on the same substrate, wherein the materials have different energy band gaps and can be compounds such as gallium arsenide or semiconductor alloys such as silicon-germanium). In the following description of the present application, a photovoltaic device is exemplified as a heterojunction device. Of course, it will be understood by those skilled in the art that the photovoltaic module may also be other types of modules, and is not limited to a heterojunction module.

As shown in fig. 5 and 8, a photovoltaic module, for example, a heterojunction module, according to an embodiment of the present invention includes a plurality of cell sheets 1 and a plurality of interconnected structural members 2. In the description of the present invention, "a plurality" means two or more.

Each cell 1 includes a cell body 11 and a plurality of grid lines 12, and the plurality of grid lines 12 are spaced apart from each other and disposed on the cell body 11. For example, in the examples of fig. 1, 4, and 7, the battery piece 1 may be a single crystal battery piece, the battery piece body 11 is substantially rectangular, and four corners of the battery piece body 11 are arc-shaped. The plurality of gate lines 12 may extend in the left-right direction and be uniformly spaced in the up-down direction. The plurality of grid lines 12 may be parallel to each other and all parallel to two opposite sides of the battery cell body 11. Therefore, by arranging the plurality of grid lines 12, the plurality of grid lines 12 can guide the current generated by the cell body 11 through the photovoltaic effect. Moreover, the quantity of a plurality of grid lines 12 is less, and compare with current battery piece 1 that sets up main grid line and vice grid line simultaneously, on the one hand, can reduce the use amount of silver thick liquid, reduce cost, and on the other hand can reduce sheltering from of grid line 12 to battery piece 1, improves photovoltaic module for example heterojunction module's optical utilization.

As shown in fig. 5 and 8, a plurality of interconnection structures 2 are arranged at intervals along the length direction of the grid lines 12, each interconnection structure 2 extends along the arrangement direction of the grid lines 12, each interconnection structure 2 is electrically connected with the grid lines 12, and each interconnection structure 2 is adhered to the cell sheet 1 through at least one conductive adhesive member 3.

For example, in the example of fig. 5 and 8, the conductive adhesive member 3 is electrically connected to both the battery sheet 1 and the interconnect structure 2. The current generated by the cell body 11 through the photovoltaic effect can be transferred to the plurality of grid lines 12 and from the plurality of grid lines 12 to the interconnecting structural member 2, or the current can be transferred from the cell body 11 to the conductive adhesive member 3 and then from the conductive adhesive member 3 to the interconnecting structural member 2 and finally be led out through the interconnecting structural member 2. Therefore, by arranging the conductive bonding part 3, the welding tension between the interconnection structural part 2 and the cell 1 can be effectively improved, so that the interconnection structural part 2 and the cell 1 can be firmly connected, and the reliability of a photovoltaic module such as a heterojunction module is effectively improved.

It should be noted that seven interconnecting structural members 2 are shown in fig. 5 and 8 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solutions of the present application that the solutions can be applied to other numbers of interconnecting structural members 2, and the present invention also falls into the protection scope of the present invention.

Each of the conductive adhesives 3 is made of a conductive paste containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles, and silver-coated copper particles. Therefore, when the conductive adhesive member 3 is made of conductive paste containing at least one of nickel particles and nickel-coated carbon particles, the cost of the conductive adhesive member 3 is low, so that the cost of the whole photovoltaic module can be effectively reduced; when the conductive adhesive member 3 is made of the conductive paste containing at least one of silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles, and silver-coated copper particles, the conductive performance of the conductive adhesive member 3 can be ensured while the cost of the photovoltaic module is reduced, so that current can be effectively transmitted to the interconnection structural member 2 through the conductive adhesive member 3, which is beneficial to the output of the current.

According to the photovoltaic module, such as a heterojunction module, provided by the embodiment of the invention, the interconnection structure 2 is bonded with the cell sheet 1 through at least one conductive bonding member 3, and each conductive bonding member 3 is made of the conductive paste containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles and silver-coated copper particles, so that the connection firmness between the interconnection structure 2 and the cell sheet 1 can be effectively improved, and the reliability of the photovoltaic module, such as the heterojunction module, can be improved. Moreover, the conductive adhesive member 3 thus arranged has a good conductivity, can reduce the resistance, and is advantageous for the output of current. In addition, the cost of the conductive adhesive member 3 is low, so that the cost of the entire photovoltaic module such as a heterojunction module can be effectively reduced.

In some embodiments of the present invention, when the conductive adhesive member 3 is made of a conductive paste containing silver-coated nickel particles or silver-coated copper particles, the ratio of silver by mass is 15% to 25% (inclusive). Specifically, for example, when the mass ratio of silver is less than 15%, the content of silver is too small, so that the conductive performance and the oxidation resistance of the conductive adhesive member 3 may be reduced; when the mass ratio of silver is more than 25%, the content of silver is excessive, which may result in excessive cost of the entire photovoltaic module. Therefore, the conductive adhesive piece 3 can be ensured to have better conductivity by enabling the mass percentage of silver to be 15% -25%, so that the welding tension of the cell 1 and the interconnection structural member 2 is improved, the current generated by the cell 1 can be better transmitted to the interconnection structural member 2, and the cost of a photovoltaic module such as a heterojunction module can be effectively reduced.

When the conductive adhesive member 3 is made of the conductive paste containing the nickel-coated carbon particles, the mass ratio of nickel is 60% to 75% (inclusive). So set up, on the one hand, can guarantee the electric conductive property of electrically conductive bonding member 3 to effectively transmit the electric current that battery piece 1 produced to interconnect structure 2, improve photovoltaic module for example the output of heterojunction subassembly, and can reduce cost, improve the corrosion resistance of electrically conductive bonding member 3, thereby make the structure of electrically conductive bonding member 3 more stable.

In some embodiments of the present invention, each of the gate lines 12 may be made of a conductive paste containing at least one of nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles, and silver-coated copper particles. Therefore, when the grid line 12 is made of the conductive paste containing at least one of nickel particles and nickel-coated carbon particles, the cost of nickel, copper and carbon is low, so that the cost of a photovoltaic module such as a heterojunction module can be further reduced while the conductivity of the grid line 12 is ensured; when the grid line 12 is made of the conductive paste containing at least one of the silver-coated nickel particles, the silver-coated carbon particles, the silver-coated aluminum particles and the silver-coated copper particles, since silver is not easily oxidized and has good conductivity, the conductivity of the grid line 12 can be improved while the cost of a photovoltaic module such as a heterojunction module is effectively reduced, so that the grid line 12 can effectively collect current generated by the battery piece 1, and the output power of the photovoltaic module such as the heterojunction module is improved.

As shown in fig. 12, the conductive paste may include a plurality of conductive particles 4 closely arranged. The conductive particles 4 may be silver-coated nickel particles, silver-coated copper particles, silver-coated carbon particles, silver-coated aluminum particles, or nickel-coated carbon particles. Each conductive particle 4 includes an inner core 41 and a coating layer 42 coated outside the inner core 41. Specifically, when the clad layer 42 is a silver metal layer, the core 41 may be a nickel metal core, a copper metal core, an aluminum metal core, a carbon metal core, or the like; when the clad layer 42 is a nickel metal layer, the core 41 may be a carbon core. For example, in the example of fig. 12, each conductive particle 4 is substantially spherical, and a gap between two adjacent conductive particles 4 may be filled with silver paste to improve the conductive performance of the conductive paste. Of course, the conductive particles 4 may also have other shapes, and are not limited to spherical shapes.

In some embodiments of the present invention, when the gate line 12 is made of the conductive paste containing the silver-coated nickel particles or the silver-coated copper particles, the ratio of silver is 15% to 25% by mass (inclusive). Specifically, for example, when the mass ratio of silver is less than 15%, the content of silver is too small, so that the conductive performance and the oxidation resistance of the gate line 12 may be reduced; when the mass ratio of silver is more than 25%, the content of silver is excessive, which may result in excessive cost of the entire photovoltaic module. Therefore, the grid line 12 can be ensured to have better conductivity by enabling the mass percentage of silver to be 15% -25%, so that the current generated by the battery piece 1 can be better transmitted to the interconnection structural member 2, and the cost of a photovoltaic assembly such as a heterojunction assembly can be effectively reduced.

When the grid line 12 is made of a conductive paste containing nickel-coated carbon particles, the mass ratio of nickel is 60% to 75% (inclusive). Therefore, by making the mass ratio of nickel 60% to 75%, the conductivity of the gate line 12 is ensured, the cost is reduced, and the corrosion resistance of the gate line 12 can be improved, so that the structure of the gate line 12 is more stable.

Alternatively, the material of the gate line 12 and the conductive adhesive 3 may be the same. Therefore, the material types of the photovoltaic module such as a heterojunction module can be reduced, the processing procedure of the photovoltaic module is simplified, and the production and the manufacture of the photovoltaic module are facilitated.

In some embodiments of the present invention, referring to fig. 7-9, at least one conductive adhesive 3 is connected between the interconnect structure 2 and the corresponding grid line 12. Therefore, when the conductive adhesive member 3 is connected between the interconnection structure member 2 and the corresponding gate line 12, the current can be transmitted to the conductive adhesive member 3 through the gate line 12 and then transmitted from the conductive adhesive member 3 to the interconnection structure member 2, so that the resistance between the gate line 12 and the interconnection structure member 2 can be reduced, and the normal output of the current is facilitated. Moreover, a part of the conductive adhesive member 3 thus arranged may coincide with the gate line 12, and a shielding area of the cell body 11 may be reduced, so that output power of a photovoltaic module, such as a heterojunction module, may be improved.

In some embodiments of the present invention, in conjunction with fig. 4-6, at least one electrically conductive adhesive 3 is connected between the interconnect structure 2 and the cell body 11. The conductive adhesive member 3 may be in contact with the adjacent gate line 12 at this time, or may be spaced apart from the adjacent gate line 12. For example, when the conductive adhesive member 3 is connected between the interconnecting structural member 2 and the cell body 11, current may be transferred from the cell body 11 to the conductive adhesive member 3, and finally from the conductive adhesive member 3 to the interconnecting structural member 2; when the conductive adhesive member 3 is in contact with the adjacent grid lines 12, current may be transferred from the cell body 11 to the grid lines 12, then from the grid lines 12 to the conductive adhesive member 3, and finally to the interconnect structure 2 through the conductive adhesive member 3. Thus, the conductive adhesive member 3 thus provided is advantageous for output of current, and can improve current conversion efficiency, thereby improving output power of a photovoltaic module such as a heterojunction module. Moreover, the conductive adhesive member 3 thus provided can reduce the total thickness of the photovoltaic module.

Further, when the conductive adhesive member 3 is located between the interconnection structure 2 and the cell body 11, the height of the conductive adhesive member 3 is less than or equal to the height of the grid lines 12. With the arrangement, the phenomenon that the welding tension between the interconnection structural member 2 and the grid lines 12 is influenced by the fact that the interconnection structural member 2 is supported due to the fact that the height of the conductive bonding member 3 is too large can be avoided, and therefore the firmness of welding between the interconnection structural member 2 and the grid lines 12 can be guaranteed.

In some embodiments of the present invention, as shown in fig. 10 and 11, at least one conductive adhesive member 3 is located between the edge of the battery sheet 1 and the outermost one of the plurality of grid lines 12. When there is one conductive adhesive member 3, the conductive adhesive member 3 is located between the edge of the battery piece 1 and the outermost one of the grid lines 12; when the conductive adhesive member 3 is plural, at least one of the plural conductive adhesive members 3 is located between the edge of the battery cell 1 and the outermost one of the plural grid lines 12.

So set up, on the one hand, a plurality of electrically conductive adhesive 3 can play the effect of connecting battery piece 1 and interconnection structure 2, can increase the contact force between battery piece 1 and the interconnection structure 2, and make the connection between interconnection structure 2 and the grid line 12 more firm to can improve photovoltaic module for example the reliability of heterojunction subassembly, on the other hand, electrically conductive adhesive 3 is less to battery piece 1's the area of sheltering from, thereby can guarantee photovoltaic module for example the heterojunction subassembly has higher optical utilization.

In some embodiments of the present invention, referring to fig. 10, a plurality of conductive adhesives 3 are disposed between each of the interconnection structures 2 and the cell sheet 1, a part of the plurality of conductive adhesives 3 is located between the edge of the cell sheet 1 and one side of all the grid lines 12, and another part of the plurality of conductive adhesives 3 is located between the edge of the cell sheet 1 and the other side of all the grid lines 12.

For example, in the example of fig. 10, two edges of the cell body 11 parallel to the grid lines 12 may be a first edge and a second edge, respectively, and two outermost ones of the plurality of grid lines 12 may be a first grid line and a second grid line, respectively, the first grid line being disposed adjacent to the first edge and the second grid line being disposed adjacent to the second edge. Each interconnecting structural member 2 may be bonded to the cell sheet 1 by two conductive bonding members 3. One of the two conductive adhesives 3 may be located between the first edge and the first gate line, and the other of the two conductive adhesives 3 may be located between the second edge and the second gate line. Therefore, through the arrangement, the plurality of conductive bonding parts 3 can be arranged close to the edge of the battery piece 1, and the shading area of the conductive bonding parts 3 can be further reduced while the interconnection structural part 2 is firmly connected with the battery piece 1.

Of course, the invention is not limited thereto, and in other embodiments of the invention, a plurality of conductive adhesive members 3 are disposed between each of the interconnecting structural members 2 and the cell sheet 1, and the plurality of conductive adhesive members 3 includes at least one first conductive adhesive member and at least one second conductive adhesive member, the first conductive adhesive member is located between the edge of the cell sheet 1 and the outermost one of the grid lines 12, and the second conductive adhesive member is located between two adjacent grid lines 12. With such an arrangement, the plurality of conductive bonding members 3 can connect the middle portions of the interconnection structure member 2 and the battery cell 1 and the edges of the interconnection structure member 2 and the battery cell 1, so that the connection between the interconnection structure member 2 and the battery cell 1 can be more secure. Here, it should be noted that the "middle portion of the battery sheet 1" is broadly understood in the present application, and refers to a portion near the middle of the battery sheet 1 with respect to the edge of the battery sheet 1, and is not limited to the center of the battery sheet 1.

In some embodiments of the present invention, referring to fig. 4, 5, 7, 8 and 10, at least one grid line 12 is disposed between two adjacent conductive adhesives 3 along the length of the interconnect structure 2. Therefore, when one grid line 12 is arranged between two adjacent second bonding pieces along the length direction of the interconnection structural member 2, one second bonding piece is arranged between every two adjacent grid lines 12, the number of the second bonding pieces can be one more than that of the grid lines 12, and the firm connection between the interconnection structural member 2 and the battery piece 1 can be effectively ensured; when a plurality of grid lines 12 are arranged between two adjacent second bonding pieces along the length direction of the interconnection structural member 2, the number of the second bonding pieces is relatively small, so that the shielding of the cell 1 can be reduced, and the optical utilization rate of a photovoltaic module such as a heterojunction module is ensured.

In some embodiments of the present invention, referring to fig. 11, a plurality of conductive adhesive members 3 are disposed between each of the interconnection structural members 2 and the cell sheet 1, and a distance between two adjacent conductive adhesive members 3 adjacent to the edge of the cell sheet 1 along the length direction of the interconnection structural members 2 is smaller than a distance between two adjacent conductive adhesive members 3 located in the middle of the cell sheet 1. Therefore, through the arrangement, the conductive bonding parts 3 at the edges adjacent to the cell 1 are distributed densely, the conductive bonding parts 3 at the middle of the cell 1 are distributed sparsely, the firm connection of the interconnection structural part 2 and the cell 1 is ensured, meanwhile, the welding tension between the interconnection structural part 2 and the grid line 12 can be effectively improved, and therefore the photovoltaic module such as a heterojunction module has excellent electrical performance.

In some alternative embodiments of the present invention, the width of each conductive adhesive member 3 in the length direction of the gate line 12 may be less than or equal to the width of the corresponding interconnection structure member 2 (not shown). Thus, the shading area of the conductive adhesive member 3 can be effectively reduced while the firm connection between the interconnection structural member 2 and the battery piece 1 is ensured.

Alternatively, as shown in fig. 4 and 7, the conductive adhesive member 3 may be printed on the battery sheet 1. For example, during manufacturing, the conductive adhesive member 3 may be printed on the surface of the battery sheet 1 facing the plurality of interconnection structure members 2, and then the interconnection structure members 2 are welded to the grid lines 12 and adhered to the battery sheet 1. Thus, through the arrangement, the conductive adhesive member 3 can be accurately printed on the battery piece 1 while the firm connection between the interconnection structural member 2 and the battery piece 1 is realized, and the operation is convenient.

Of course, the invention is not limited thereto, and with reference to fig. 2, the conductive adhesive 3 may also be coated on the interconnecting structural member 2. For example, the conductive adhesive 3 may be attached to the interconnect structure 2 by dispensing, spraying, printing, and the like. By the arrangement, the interconnection structural member 2 and the battery plate 1 can be firmly connected, and the phenomenon that the printing area of the conductive bonding member 3 is too large can be avoided, so that the shading area of the conductive bonding member 3 is reduced, and the material cost can be reduced.

In some embodiments of the present invention, a plurality of grid lines 12 are disposed on the front surface and the back surface of each cell body 11, and the number of the grid lines 12 on the back surface of each cell body 11 is greater than or equal to the number of the grid lines 12 on the front surface of the corresponding cell body 11. So set up, can effectively reduce grid line 12 and to the positive area of sheltering from of cell piece body 11, increase the positive photic area of cell piece body 11, and can reduce the positive resistance of cell piece body 11, increase the electric current to can further improve photovoltaic module for example heterojunction module's output.

In some embodiments of the present invention, the number of the interconnection structures 2 on the front surface (i.e. the main incident surface of the sun) of each cell body 11 is N₁The number of the interconnecting structural members 2 on the back surface (i.e. the surface opposite to the main incident light surface of the sun) of each cell body 11 is N₂Wherein N is₁、N₂Respectively satisfy: n is not less than 9₁≤18，9≤N₂Less than or equal to 18. Thereby, by making N₁、N₂Respectively satisfy: n is not less than 9₁≤18，9≤N₂Less than or equal to 18, a plurality of interconnected structural components 2 can effectively collect the current generated by the battery plate 1, andthe shielding of the cell 1 is reduced, and a photovoltaic module such as a heterojunction module is ensured to have higher output power. Alternatively, the number of the interconnection structures 2 on the front side of the cell body 11 and the number of the interconnection structures 2 on the back side of the corresponding cell body 11 may be equal.

In some embodiments of the present invention, each interconnect structure 2 comprises a conductive substrate 21 and a solder layer 22, the solder layer 22 covering at least a portion of the conductive substrate 21, the solder layer 22 being composed of Sn (tin, a metal element, a silvery white lustrous metal element), Bi (bismuth, group VA 83 of the sixth period of the periodic table), and Pb (lead, a metal chemical element having an atomic number of 82 and an atomic number of 207.2, which is the most atomic non-radioactive element). Therefore, the Sn is low in melting point, soft in texture and rich in ductility, plays an important role in welding between the interconnection structural member 2 and the photovoltaic module such as the cell 1 of the heterojunction module, and the Bi element can reduce the melting point temperature of the soldering tin layer 22, so that the welding temperature of the interconnection structural member 2 can be reduced, the yield of the cell 1 is improved, and the generation of cold joint is avoided. And has no pollution and is environment-friendly. Further, by adding Pb to the solder layer 22, the surface tension and viscosity of the solder layer 22 can be reduced, so that the solder layer 22 has good wettability and can absorb thermal stress generated by temperature change well.

Wherein, the content of Bi is 5 percent to 25 percent (inclusive), and the content of Sn is 35 percent to 55 percent (inclusive). For example, when the solder layer 22 is composed of Sn, Bi, and Pb, the Sn content may be constant, the Bi content may vary, the melting point temperature of the solder layer 22 may vary, and the Pb content may decrease by 1% and the melting point temperature may decrease by about 2 ℃ for every 1% increase in the Bi content. However, the content of Bi cannot be too high, and when the content of Bi is too high, the greater the reliability risk, the more fragile the interconnection structure 2 is and the more easily oxidized. Thus, by setting the Bi content to 5% to 25%, the melting point of the solder layer 22 can be reduced, and the low-temperature brittleness and oxidation can be prevented; by enabling the content of Sn to be 35% -55%, the interconnection structural member 2 has good welding performance, and the welding quality between the interconnection structural member 2 and the battery piece 1 is guaranteed, so that the interconnection structural member 2 is guaranteed to have high current collection efficiency.

In some alternative embodiments of the present invention, the solder layer 22 has a thickness t, where t satisfies: t is more than or equal to 10 mu m and less than or equal to 20 mu m. Specifically, for example, when t < 10 μm, the thickness of the solder layer 22 is too small, which may reduce the quality of the solder joint between the interconnection structure 2 and the battery cell 1, and when t > 20 μm, which may result in a cost of the entire interconnection structure 2 being too high. Thus, by letting t satisfy: t is more than or equal to 10 microns and less than or equal to 20 microns, the welding quality between the interconnection structural member 2 and the battery piece 1 is ensured, meanwhile, the shielding of the battery piece 1 can be reduced, and the cost is lower.

In some embodiments of the present invention, the solder layer 22 has a melting point temperature T, where T satisfies: t is more than or equal to 120 ℃ and less than or equal to 145 ℃. Specifically, for example, when T < 120 ℃, the melting point temperature of the solder layer 22 is too low and brittleness is large, thereby making the interconnection structure 2 less reliable; when T > 145 ℃, the melting point temperature of the solder layer 22 is too high, which causes a high soldering temperature of the interconnection structure 2, which may result in a high defective rate of the battery plate 1 and may cause cold joints. Thus, by making T satisfy: t is more than or equal to 120 ℃ and less than or equal to 145 ℃, the melting point temperature of the soldering tin layer 22 is reasonable, and the interconnection structure 2 is a low-temperature interconnection structure, so that the yield of photovoltaic components such as the cell 1 of a heterojunction component can be improved, the generation of insufficient solder can be avoided, the low-temperature brittleness can be reduced, and the reliability of the interconnection structure 2 can be improved.

Alternatively, a photovoltaic module such as a heterojunction module may include an upper glass layer, a front adhesive film layer, a solar cell module, a back adhesive film layer, and a lower cover plate. Wherein, the front adhesive film layer and the back adhesive film layer can be POE (ethylene-octylene copolymer, novel polyolefin thermoplastic elastomer with narrow relative molecular mass distribution and narrow comonomer distribution and controllable structure developed by taking metallocene as a catalyst) layer or EVA (ethylene-vinyl acetate copolymer is a general high molecular polymer) layer and the like. The lower cover plate may be glass or a back plate. The solar cell module can be connected by a plurality of cell sheets 1 via an interconnection structure 2, for example, a low-temperature solder ribbon, to achieve current output.

Each cell 1 is sequentially provided with a front grid line, a front transparent conductive film, a front amorphous silicon N layer, a front amorphous silicon i layer, an N-type Si substrate, a back amorphous silicon i layer, a back amorphous silicon p layer, a back transparent conductive film layer and a back grid line 12 from the front to the back. Wherein the front transparent conductive film and the back transparent conductive film can be ITO, IWO or ITiO, etc.

The following describes a process for manufacturing a cell sheet 1 of a photovoltaic module according to an embodiment of the present invention.

The manufacturing process of the battery piece 1 sequentially comprises the steps of texturing and grid line printing 12. In texturing, PECVD (Plasma Enhanced Chemical Vapor Deposition) amorphous silicon a-Si: H (i) on the front side and a-Si: H (n) on the back side of the PECVD, and PVD (Physical Vapor Deposition) transparent conductive films TCO on the front side and the back side are needed. Wherein texturing is to remove damage (e.g., 10 μm per side), the texturing size can be 3 μm to 5 μm inclusive, and double-sided a-Si: H (i) is to increase Voc; h (N) is the a-Si on the front side of the PECVD, H (P) is the a-Si on the back side of the PECVD, the passivation effect is improved, the Voc is improved, and meanwhile, a P-N junction is formed on the back side; the transparent conductive film TCO on the front side and the back side of the PVD is used for increasing conductivity and reducing transverse resistance loss.

When the grid line 12 is printed, the paste component of the grid line 12 adopts nickel, copper, a mixture of nickel and carbon, or a mixture of silver and at least one of nickel, carbon, aluminum, copper, glass, silicon and resin particles, so that the conductivity of the grid line 12 is ensured, and the cost is reduced. In addition, the number of the grid lines 12 on the back surface of the cell body 11 is greater than or equal to the number of the grid lines 12 on the front surface of the cell body 11, so that the light receiving area of the front surface of the cell body 11 is increased, and the output power of a photovoltaic module such as a heterojunction module is increased.

Other constructions and operations of photovoltaic modules, such as heterojunction modules, according to embodiments of the invention are known to those of ordinary skill in the art and will not be described in detail herein.

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", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so 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.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.