CN214043681U

CN214043681U - Photovoltaic module

Info

Publication number: CN214043681U
Application number: CN202022497315.5U
Authority: CN
Inventors: 梅玲; 闫新春; 陆悦; 许涛
Original assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc; CSI Solar Technologies Inc
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2021-08-24
Anticipated expiration: 2030-11-02

Abstract

The application provides a photovoltaic module, which comprises a plurality of solar cells and conductive adhesive, wherein the solar cells are sequentially overlapped along a first direction, and the conductive adhesive is used for electrically connecting the adjacent solar cells; the conductive adhesive is provided with conductive particles, and the conductive particles comprise a core body and a shell body coated on the outer side of the core body; the thickness of the conductive adhesive is set to be 30-70 mu m, and the width of the conductive adhesive along the first direction is set to be 300-1000 mu m. This application photovoltaic module carries out optimal design through the glueing thickness, the width to the structure of conducting particle in the conducting resin and the conducting resin between the adjacent solar cell, reduces material cost, also can satisfy the diversified demand of different products better.

Description

Photovoltaic module

Technical Field

The application relates to the technical field of solar energy manufacturing, in particular to a photovoltaic module.

Background

The traditional photovoltaic module usually adopts a welding strip to connect a plurality of solar cells in series to form a corresponding cell string, light irradiating the gap position of the adjacent solar cells cannot be effectively utilized, the utilization rate of the light is influenced, and the material and packaging cost is increased. Compared with the traditional photovoltaic module, the laminated assembly cancels the inter-sheet distance, increases the effective power generation area, can arrange and place more cells under the same condition, and can greatly improve the output power of the assembly; moreover, the tiling technology can be combined with various high-efficiency batteries for application, so that the assembly efficiency is further improved.

The laminated assembly is generally prepared by cutting and breaking an entire battery piece printed with a predetermined pattern by laser to obtain a strip-shaped battery piece, and sequentially overlapping a plurality of strip-shaped battery pieces to obtain a corresponding battery string. The overlapping area of the adjacent strip-shaped battery pieces is provided with conductive adhesive, and the mechanical bonding and the electrical connection of the adjacent strip-shaped battery pieces are realized through the conductive adhesive. The composition, the dosage, the curing process and the like of the conductive adhesive all affect the performance and the output power of the assembly, and how to improve the performance of the laminated assembly is still an important subject of active research in the industry.

SUMMERY OF THE UTILITY MODEL

The photovoltaic module can reduce material cost and better meet the requirements of product development and production.

In order to achieve the above object, an embodiment of the present application provides a photovoltaic module, including a plurality of solar cells sequentially overlapped along a first direction and a conductive adhesive for electrically connecting adjacent solar cells; the conductive adhesive is provided with conductive particles, and the conductive particles comprise a core body and a shell body coated on the outer side of the core body; the thickness of the conductive adhesive is set to be 30-70 mu m, and the width of the conductive adhesive along the first direction is set to be 300-1000 mu m.

As a further improvement of the embodiment of the application, the thickness of the conductive adhesive is set to be 40-60 μm; the width of the conductive adhesive along the first direction is set to be 400-600 mu m.

As a further improvement of the embodiments of the present application, the conductive particles are arranged in a spherical, spheroidal or platelet shape.

As a further improvement of the embodiment of the present application, the core is made of any one of metal materials of copper, aluminum, nickel, manganese, zinc, tungsten, iron, tin and chromium, or an alloy material composed of at least two of the metal materials; the shell is made of silver, indium tin oxide or zinc oxide.

As a further improvement of the embodiment of the application, the thickness of the shell is set to be 1-10 μm.

As a further improvement of the embodiment of the application, the thickness of the shell is set to be 1-5 μm.

As a further improvement of the embodiment of the application, the core is arranged to be spherical or quasi-spherical, and the diameter of the core is arranged to be 2-50 μm.

As a further improvement of the embodiment of the application, the diameter of the core body is set to be 5-20 μm.

As a further improvement of the embodiment of the present application, the solar cell includes a silicon substrate and a metal electrode disposed on the silicon substrate, the silicon substrate has a first side edge and a second side edge disposed opposite to each other along a first direction, and the metal electrode includes a front-side main grid disposed adjacent to the first side edge and a back-side main grid disposed adjacent to the second side edge; the back main grids of the solar cells are at least partially arranged on the front main grid of the other solar cell in a stacking mode, and the conductive adhesive is in contact with the back main grid and the front main grid in the overlapping area of the adjacent solar cells.

As a further improvement of the embodiment of the present application, the conductive paste is disposed in the overlapping region of the adjacent solar cells and does not exceed the overlapping region of the adjacent solar cells.

The beneficial effect of this application is: adopt this application photovoltaic module, through the structure to conductive particle in the conducting resin and the glueing thickness, the width of conducting resin between the adjacent solar cell carry out optimal design, reduce material cost, guarantee adjacent solar cell's electric connection performance and cohesive strength, also can satisfy the diversified demand of different products better.

Drawings

FIG. 1 is a schematic view of a portion of a cell string of a photovoltaic module of the present application;

FIG. 2 is a schematic view of the connection of adjacent solar cells in a string of cells of a photovoltaic module of the present application;

FIG. 3 is a schematic front view of a solar cell in a photovoltaic module according to the present application;

FIG. 4 is a schematic view of the backside structure of a solar cell in a photovoltaic module according to the present application;

fig. 5 is a schematic structural diagram of conductive particles of the conductive paste in the photovoltaic module of the present application.

100-a battery string; 10-a solar cell; 101-an overlap region; 1-a silicon substrate; 11-a first side; 12-a second side edge; 21-front main grid; 22-back side main gate; 20-conductive adhesive; 200-conductive particles; 201-a core; 202-housing.

Detailed Description

The present application will be described in detail below with reference to embodiments shown in the drawings. The present invention is not limited to the above embodiments, and structural, methodological, or functional changes made by one of ordinary skill in the art according to the present embodiments are included in the scope of the present invention.

Referring to fig. 1 and 2, the photovoltaic module provided in the present application includes a plurality of cell strings 100, where the cell strings 100 include a plurality of solar cells 10 sequentially overlapped along a first direction and a conductive adhesive 20 for electrically connecting adjacent solar cells 10.

The width of the overlapping region 101 of the adjacent solar cells 10 in the cell string 100 is usually set to be 0.8-2 mm, and the conductive adhesive 20 is disposed in the overlapping region 101 of the adjacent solar cells 10 and does not exceed the overlapping region 101 of the adjacent solar cells 10, so that the area of an effective light receiving region is not affected, and the beauty of the assembly product is also ensured.

Referring to fig. 3 and 4, the solar cell 10 includes a silicon substrate 1 and a metal electrode disposed on the silicon substrate 1, the silicon substrate 1 has a first side 11 and a second side 12 disposed opposite to each other along a first direction, and the metal electrode includes a front main grid 21 disposed adjacent to the first side 11 and a back main grid 22 disposed adjacent to the second side 12. For two adjacent solar cells 10, the back main grid 22 of one solar cell 10 is at least partially stacked on the front main grid 21 of the other solar cell 10. In the overlapping region 101 of the adjacent solar cell 10, the conductive adhesive 20 is in contact with the front main grid 21 and the back main grid 22. It should be noted that the conductive paste 20 may be completely disposed between the front surface main grid 21 and the back surface main grid 22, or may be in direct contact with the surface of the silicon substrate 1.

The solar cell 10 is generally obtained by cutting a whole-piece cell, and the silicon substrate 1 is rectangular or rectangular with a chamfer design. The front side of the solar cell 10 is the main light-receiving side of the solar cell 10, and is the side of the solar cell 10 that faces upward in subsequent mounting applications. The first direction corresponds to a short side direction of the solar cell 10, and the first side 11 and the second side 12, i.e. two long sides of the solar cell 10, extend along a second direction perpendicular to the first direction; the front main grid 21 and the back main grid 22 also extend along the second direction. Of course, the metal electrode further includes a secondary grid line (not shown) disposed on the surface of the silicon substrate 1, and the secondary grid line is used for collecting the surface current of the silicon substrate; the solar cell 10 further includes a corresponding passivation and anti-reflection film layer, which is not described in detail herein.

Referring to fig. 5, the conductive paste 20 has conductive particles 200, and the conductive particles 200 are disposed in a spherical, spheroidal or plate shape. The conductive particle 200 includes a core 201 and a shell 202 covering the core 201, and typically, the core 201 is made of a low-cost metal or alloy; the housing 202 is made of metal or metal oxide with high conductivity and high oxidation resistance. Such as: the core body 201 can be made of any one of metal materials of copper, aluminum, nickel, manganese, zinc, tungsten, iron, tin and chromium or an alloy material formed by at least two of the metal materials; the housing 202 is made of silver or indium tin oxide or zinc oxide.

Compared with pure silver particles, the cost of the conductive particles 200 is reduced, and the composition and formula of the conductive adhesive 20 are adjusted more abundantly, so that the conductive adhesive is convenient to design correspondingly according to different product requirements. As an example: the core 201 is made of copper, the shell 202 is made of silver, and the electrical performance of the core is basically equivalent to that of pure silver particles through testing, and the resistivity of the core is less than 1 x 10^-2Omega cm, good acid and alkali corrosion resistance, and material cost equivalent to 40% -60% of pure silver particles; the core 201 is made of nickel, the shell 202 is made of silver, and the resistivity of the shell is less than 3 x 10^-2Omega cm, good dry heat resistance, the fluctuation range of resistance is less than 30% under dry heat condition, and the material cost is 40% -70% of that of pure silver particles; the core 201 is made of aluminum, the shell 202 is made of silver, and the resistivity of the shell is less than 5 x 10^-2Omega cm, the material cost is 30-60% of that of pure silver particles, and the powder density is low, so that the sizing weight can be further reduced.

In the foregoing embodiment, the core 201 is provided in a spherical or quasi-spherical shape, and the diameter of the core 201 is set to be 2-50 μm; the thickness of the shell 202 is set to be 1-10 mu m. Preferably, the diameter of the core 201 is set to be 5-20 μm; the thickness of the shell 202 is set to be 1-5 μm.

By adopting the conductive adhesive 20, the material cost is reduced, and the glue application amount between the adjacent solar cells 10 can be properly increased, so that the electrical connection performance and the mechanical bonding strength between the adjacent solar cells 10 are improved. In the actual production process, the conductive adhesive can be applied by adopting a spot coating method, a spray valve method or a printing method, the applying thickness is set to be 50-120 mu m, and the applying width is set to be 100-800 mu m. After low-temperature curing molding, the thickness of the conductive adhesive 20 between adjacent solar cells 10 is 30-70 μm; the width of the conductive adhesive 20 along the first direction is 300-1000 μm.

Preferably, the sizing thickness of the conductive adhesive 20 is set to be 60-90 μm, and the sizing width is set to be 200-400 μm. When the curing is finished, the thickness of the conductive adhesive 20 is 40-60 μm; the width of the conductive adhesive 20 along the first direction is 400-600 μm.

To sum up, this application photovoltaic module reduces material cost through conducting particle 200's structure and conducting resin 20's between the adjacent solar cell 10 glueing thickness, width carry out the optimal design in the conducting resin 20, guarantees adjacent solar cell 10's electric connection performance and cohesive strength, also can satisfy the diversified demand of different products better.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the concrete description of the feasible embodiments of the present application, they are not intended to limit the scope of the present application, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present application are intended to be included within the scope of the present application.

Claims

1. The utility model provides a photovoltaic module, includes a plurality of solar cell that overlap in proper order along the first direction and for electric connection is adjacent solar cell's conducting resin, the conducting resin has conductive particle, its characterized in that: the conductive particles comprise a core body and a shell body coated on the outer side of the core body; the thickness of the conductive adhesive is set to be 30-70 mu m, and the width of the conductive adhesive along the first direction is set to be 300-1000 mu m.

2. The photovoltaic module of claim 1, wherein: the thickness of the conductive adhesive is set to be 40-60 mu m; the width of the conductive adhesive along the first direction is set to be 400-600 mu m.

3. The photovoltaic module of claim 1, wherein: the conductive particles are arranged in a spherical shape, a quasi-spherical shape or a sheet shape.

4. The photovoltaic module of claim 1, wherein: the core body is made of any one metal material of copper, aluminum, nickel, manganese, zinc, tungsten, iron, tin and chromium; the shell is made of silver, indium tin oxide or zinc oxide.

5. The photovoltaic module of claim 1, wherein: the thickness of the shell is set to be 1-10 mu m.

6. The photovoltaic module of claim 1, wherein: the thickness of the shell is set to be 1-5 mu m.

7. The photovoltaic module of claim 1, wherein: the core body is arranged to be spherical or quasi-spherical, and the diameter of the core body is 2-50 mu m.

8. The photovoltaic module of claim 7, wherein: the diameter of the core body is set to be 5-20 mu m.

9. The photovoltaic module of claim 1, wherein: the solar cell comprises a silicon substrate and a metal electrode arranged on the silicon substrate, wherein the silicon substrate is provided with a first side edge and a second side edge which are oppositely arranged along a first direction, and the metal electrode comprises a front main grid arranged close to the first side edge and a back main grid arranged close to the second side edge; the back main grids of the solar cells are at least partially arranged on the front main grid of the other solar cell in a stacking mode, and the conductive adhesive is in contact with the back main grid and the front main grid in the overlapping area of the adjacent solar cells.

10. The photovoltaic module of claim 1, wherein: the conductive adhesive is arranged in the overlapping area of the adjacent solar cells and does not exceed the overlapping area of the adjacent solar cells.