CN210129517U

CN210129517U - Solar cell and photovoltaic module

Info

Publication number: CN210129517U
Application number: CN201921029607.7U
Authority: CN
Inventors: 胡建冠; 刘丽芳; 黄海生; 郭志球; 金浩
Original assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Co Ltd
Current assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Co Ltd
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-03-06
Anticipated expiration: 2029-07-03

Abstract

The application discloses a solar cell, which is a right-angled trapezoid-shaped solar cell; the long bottom edges and the high edges of the four solar cells are mutually attached in the same plane to form a regular hexagon, and the regular hexagon is internally tangent to the cross section of the silicon rod to be cut when the solar cells are manufactured. The percentage of the solar cell slice in the cross-sectional area of the silicon rod is larger, in other words, more silicon in the same silicon rod is made into the solar cell slice, so that less silicon is wasted, and the cost is reduced; simultaneously, this application will regular hexagon is the even branch for four right trapezoid, and right trapezoid can splice for the rectangle, makes follow-up photovoltaic module's composing more convenient, in addition, compares in prior art, in this application solar cell inner current is littleer, reduces the device loss, improves solar cell's generating efficiency. This application still provides a photovoltaic module who has above-mentioned beneficial effect simultaneously.

Description

Solar cell and photovoltaic module

Technical Field

The application relates to the field of photovoltaic device manufacturing, in particular to a solar cell and a photovoltaic module.

Background

In recent years, as the energy crisis and increasingly serious environmental pollution become more and more serious, and the production and investment of renewable energy sources are gradually increased in various countries, the whole photovoltaic industry is subjected to breakthrough and rapid development, and the electricity consumption cost is lower and lower. In the existing photovoltaic module, half cell modules are favored by more and more enterprises because the current flowing through each cell module is reduced, the internal consumption of the module is reduced, and the module efficiency is improved.

However, with the rapid advance of new technologies, the efficiency of the battery piece is continuously improved, and the current of the battery piece is increased, so that the consumption of the internal resistance of the battery piece is increased, the output efficiency is reduced, and in addition, in the prior art, the silicon rod is cut into an internally tangent square shape and then further cut, so that more silicon waste is caused, and the cost is high. Therefore, it is an urgent need to solve the above-mentioned problems by those skilled in the art to find a method for increasing the output power of the device while reducing the production cost.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a solar cell and a photovoltaic module so as to solve the problems that in the prior art, a solar cell is high in production cost, large in module consumption and low in output power.

In order to solve the technical problem, the application provides a solar cell, wherein the solar cell is a right-angled trapezoid-shaped solar cell;

the long bottom edges and the high edges of the four solar cells are mutually attached in the same plane to form a regular hexagon, and the regular hexagon is internally tangent to the cross section of the silicon rod to be cut when the solar cells are manufactured.

Optionally, in the solar cell, the solar cell is a solar cell including at least one solder strip of a flat solder strip, a light-gathering solder strip, a triangular solder strip and a circular solder strip.

Optionally, in the solar cell, the solder strip is a solder strip with a reflective film disposed on a surface thereof.

Optionally, in the solar cell, the number of the solder strips on the surface of the solar cell is 2 to 5, inclusive.

Optionally, in the solar cell, the solar cell is a black silicon polycrystalline cell or a PERC cell or a TOPcon cell or a HIT cell.

The application also provides a photovoltaic module, which comprises an upper module and a lower module, wherein the battery strings of the upper module are connected in series, the battery strings of the lower module are connected in series, and the battery strings of the upper module and the battery strings of the lower module are connected in parallel;

the cell string comprises the solar cell slice.

Optionally, in the photovoltaic module, adjacent to the long bottom edge of the first solar cell in the cell string, short bottom edges of adjacent solar cells are all used.

Optionally, in the photovoltaic module, one side adjacent to the long bottom edge of the first solar cell in the cell string is a short bottom edge of an adjacent solar cell, and the other side is a long bottom edge of another adjacent solar cell.

Optionally, in the photovoltaic module, the photovoltaic module further comprises a bypass diode.

Optionally, in the photovoltaic module, the diodes correspond to battery string groups one to one, the photovoltaic module has five battery strings, and a junction box of the photovoltaic module is a five-in-one junction box;

the battery string group is a battery string group which comprises a battery string of the upper assembly and a battery string of the lower assembly which are oppositely arranged.

According to the solar cell provided by the application, the solar cell is in a right-angled trapezoid shape; the long bottom edges and the high edges of the four solar cells are mutually attached in the same plane to form a regular hexagon, and the regular hexagon is internally tangent to the cross section of the silicon rod to be cut when the solar cells are manufactured. The solar cell is obtained by cutting a regular hexagon internally tangent to the cross section of the silicon rod, and the regular hexagon accounts for a larger percentage of the cross section of the silicon rod than a square in the prior art, in other words, more silicon in the same silicon rod is made into the solar cell, so that the waste of silicon is less, the raw material consumption is reduced, and the cost is also reduced; simultaneously, this application will regular hexagon is the even branch for four right trapezoid, and right trapezoid can splice for the rectangle, makes follow-up photovoltaic module's composing more convenient, in addition, compares in prior art, and the solar wafer monolithic area that provides in this application is littleer, and then makes solar cell inner current is littleer, reduces the device loss, improves solar cell's generating efficiency. This application still provides a photovoltaic module who has above-mentioned beneficial effect simultaneously.

Drawings

For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of one embodiment of a solar cell provided herein;

FIG. 2 is a schematic structural diagram of another embodiment of a solar cell provided herein;

FIG. 3 is a schematic circuit diagram of one embodiment of a photovoltaic module provided herein;

FIG. 4 is a schematic block diagram of one embodiment of a photovoltaic module provided herein;

fig. 5 is a schematic block diagram of another embodiment of a photovoltaic module provided herein.

Detailed Description

It should be noted that, in the present application, the names of the four sides of the right trapezoid are unified, that is, the side of the right trapezoid which is not perpendicular to any adjacent side is called as a hypotenuse, the shorter side adjacent to the hypotenuse is called as a short bottom side, the longer side adjacent to the hypotenuse is called as a long bottom side, and the remaining one side is called as a high side.

In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The core of the present application is to provide a solar cell, a schematic structural diagram of one embodiment of which is shown in fig. 1 and fig. 2, and is referred to as a first embodiment, wherein the solar cell is a solar cell in a right trapezoid shape;

Particularly, the solar cell piece is a solar cell comprising at least one welding strip of a flat welding strip, a light-gathering welding strip, a triangular welding strip and a circular welding strip; the solder strip can reflect the solar cell which cannot be directly irradiated, so that the solar cell can receive the solder strip, and the photoelectric conversion rate of the solar cell is improved. Furthermore, the solder strip is provided with a reflective film on the surface, so as to further improve the light reflection rate.

In addition, the solar cell is a black silicon polycrystalline cell or a PERC cell or a TOPcon cell or a HIT cell so as to meet different requirements in practical production.

And the number of the solder strips on the surface of the solar cell is 2 to 5, including the end value, such as any one of 2.0, 4.0 or 5.0. The parameter range is an optimal range obtained through theoretical calculation and actual experiments, and can be properly adjusted according to actual conditions.

Wherein, fig. 1 is a schematic structural diagram of the solar cell with two opposite bevel edges, and fig. 2 is a schematic structural diagram of the solar cell and the cross section of the silicon rod.

According to the solar cell provided by the application, the solar cell is in a right-angled trapezoid shape; the long bottom edges and the high edges of the four solar cells are mutually attached in the same plane to form a regular hexagon, and the regular hexagon is internally tangent to the cross section of the silicon rod to be cut when the solar cells are manufactured. The solar cell is obtained by cutting a regular hexagon internally tangent to the cross section of the silicon rod, and the regular hexagon accounts for a larger percentage of the cross section of the silicon rod than a square in the prior art, in other words, more silicon in the same silicon rod is made into the solar cell, so that the waste of silicon is less, the raw material consumption is reduced, and the cost is also reduced; simultaneously, this application will regular hexagon is the even branch for four right trapezoid, and right trapezoid can splice for the rectangle, makes follow-up photovoltaic module's composing more convenient, in addition, compares in prior art, and the solar wafer monolithic area that provides in this application is littleer, and then makes solar cell inner current is littleer, reduces the device loss, improves solar cell's generating efficiency.

The application also provides a photovoltaic module, a circuit schematic diagram of one specific embodiment of the photovoltaic module is shown in fig. 3, and is called as a second specific embodiment, and the photovoltaic module comprises an upper module and a lower module, wherein the cell strings of the upper module are connected in series, the cell strings of the lower module are connected in series, and the cell strings of the upper module and the cell strings of the lower module are connected in parallel;

the cell string comprises the solar cell slice.

It is noted that the photovoltaic module further comprises a bypass diode. The bypass diode can prevent current from flowing through the shielded solar cell, so that the internal resistance of the photovoltaic module is greatly reduced, the output power of the photovoltaic module is improved, and the effects of shielding prevention and hot spot prevention are achieved.

Furthermore, the diodes correspond to the battery string groups one by one, the photovoltaic module is provided with five battery strings, and the junction box of the photovoltaic module is a five-in-one junction box; the battery string group is a battery string group which comprises a battery string of the upper assembly and a battery string of the lower assembly which are oppositely arranged. The circuit diagram is shown in fig. 3, compared with the prior art, more battery string sets are added, and the power generation efficiency is improved.

According to the photovoltaic module provided by the specific embodiment, the photovoltaic module is divided into the upper part and the lower part, the upper part and the lower part are respectively connected in series inside and in parallel between the upper part and the lower part, so that a circuit structure formed by connecting in series and then connecting in parallel is realized, the internal resistance of the photovoltaic module is effectively reduced, the module loss is reduced, the output power is improved, and meanwhile, the problem that the whole photovoltaic module is scrapped due to one damaged circuit is avoided.

Still further, the assembly may be any one of a single-sided assembly or a double-sided assembly or a single-sided assembly.

On the basis of the second embodiment, the arrangement of the solar cells is further limited to obtain a third embodiment, and the structural schematic diagram of the third embodiment is as shown in fig. 4 and 5, and includes an upper module and a lower module, the cell strings of the upper module are connected in series, the cell strings of the lower module are connected in series, and the cell strings of the upper module and the cell strings of the lower module are connected in parallel;

the solar cell string comprises any one of the solar cell sheets;

the short bottom edges of the adjacent solar cells are adjacent to the long bottom edge of the first solar cell in the cell string;

alternatively, the first and second electrodes may be,

and one side adjacent to the long bottom edge of the first solar cell in the cell string is the short bottom edge of the adjacent solar cell, and the other side is the long bottom edge of the other adjacent solar cell.

The present embodiment is different from the above embodiments in that the present embodiment defines an arrangement manner of the solar cell sheets, and the rest of the structure is the same as the above embodiments, and is not described herein again.

FIG. 4 is a schematic structural diagram of a photovoltaic module having a short bottom edge of a first solar cell in the string adjacent to the long bottom edge of the adjacent solar cell; fig. 5 is a schematic structural diagram of the photovoltaic module in which one side adjacent to the long bottom edge of the first solar cell in the cell string is the short bottom edge of the adjacent solar cell, and the other side is the long bottom edge of the other adjacent solar cell.

In the specific embodiment, two arrangement modes of the solar cells are specifically defined, so that the solar cells can be compactly arranged together, the mounting is convenient, the assembly efficiency is improved, and the production time of the photovoltaic module is shortened.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The solar cell and the photovoltaic module provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A photovoltaic module is characterized by comprising an upper module and a lower module, wherein the cell strings of the upper module are connected in series, the cell strings of the lower module are connected in series, and the cell strings of the upper module and the cell strings of the lower module are connected in parallel;

the solar cell pieces in the cell string are right-angled trapezoid-shaped solar cell pieces;

the long bottom edges and the high edges of the four solar battery pieces are mutually attached in the same plane to form a regular hexagon, and the regular hexagon is internally tangent to the cross section of the silicon rod to be cut when the solar battery pieces are manufactured;

the photovoltaic module further comprises a bypass diode;

the bypass diodes correspond to the battery string groups one by one, the photovoltaic module is provided with five battery strings, and a junction box of the photovoltaic module is a five-in-one junction box;

2. The photovoltaic module of claim 1, wherein the solar cell is a solar cell comprising at least one of a flat solder ribbon, a spot solder ribbon, a delta solder ribbon, and a circular solder ribbon.

3. The photovoltaic module of claim 2, wherein the solder ribbon is a solder ribbon having a reflective film disposed on a surface thereof.

4. The photovoltaic module of claim 1, wherein the number of solder ribbons on the surface of the solar cell sheet is from 2 to 5, inclusive.

5. The photovoltaic module of claim 1, wherein the solar cell is a black silicon polycrystalline cell or a PERC cell or a TOPcon cell or a HIT cell.

6. The photovoltaic module of claim 1, wherein adjacent to the long bottom edge of a first solar cell sheet in the string of cells is a short bottom edge of an adjacent solar cell sheet.

7. The photovoltaic module of claim 1, wherein one side adjacent to the long bottom edge of a first solar cell in the string is the short bottom edge of an adjacent solar cell and the other side is the long bottom edge of another adjacent solar cell.