CN218385238U

CN218385238U - Photovoltaic cell assembly

Info

Publication number: CN218385238U
Application number: CN202222909278.3U
Authority: CN
Inventors: 孙长振; 何晨旭; 陈军杰; 徐伟智; 郑乐; 张阔; 董森茂
Original assignee: Chint New Energy Technology Co Ltd
Current assignee: Chint New Energy Technology Co Ltd
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-01-24
Anticipated expiration: 2032-11-02

Abstract

The utility model relates to the photovoltaic industry technology, in particular to a photovoltaic cell assembly, which comprises a cell slice; the front surface of the battery piece is provided with a plurality of first strip-shaped grooves which are parallel to each other; a first metal wire is arranged in the first strip-shaped groove in a sintering mode; the front surface of the battery piece is printed with a thin grid line which is in contact with the first metal wire; the thin grid line and the first metal wire are arranged in a crossed mode, so that current in the thin grid line can be converged into the first metal wire. In the application, a plurality of strip-shaped grooves are formed in the surface of a battery piece, and metal wires are arranged in the strip-shaped grooves in a sintering mode; because the strip-shaped groove has a limiting effect on the metal wire, the metal wire can be limited to move on the surface of the cell, so that the stability of the metal wire fixed on the cell is ensured, and when the metal wire is packaged and fixed, the metal wire is not required to be subjected to complex pressing operation, the fixed packaging process of the metal wire is simplified to a certain extent, and the cost of the solar cell without the main grid is reduced.

Description

Photovoltaic cell assembly

Technical Field

The utility model relates to a photovoltaic module technical field especially relates to a photovoltaic cell subassembly.

Background

With global temperature rise and increasingly worsened environment, the pollution of the traditional fossil energy to the environment and the greenhouse effect make renewable energy a necessary choice for sustainable development. The photovoltaic development is rapid under the energy crisis, the conversion efficiency of the solar cell is improved, the manufacturing cost of the cell and the component is reduced, and the photovoltaic development becomes a necessary trend.

The solar cell without the main grid is characterized in that only fine grid line electrodes are printed, and main grid line printing is cancelled, so that the light receiving area of the front face of the cell is increased, the short-circuit current and the power of the cell are improved, and the use amount of grid line printing silver paste is reduced to reduce the production cost and the unit consumption of the cell. However, since the solar cell without the main grid has no main grid line, in order to realize the current convergence in the thin grid line, a conductive structure for converging the thin grid line needs to be further arranged on the solar cell.

At present, in the solar cell without the main grid, the way of converging the current of the thin grid line is to further arrange a copper wire on the solar cell. However, the current method for arranging copper wires on the solar cell piece in a packaging manner is complex in process and high in cost, and is not beneficial to wide application of the solar cell without the main grid.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a photovoltaic cell module has simplified the complexity of no main grid solar cell's packaging mode to a certain extent to reduce solar cell's manufacturing cost.

In order to solve the technical problem, the utility model provides a photovoltaic cell assembly, include:

a battery piece; the front surface of the battery piece is provided with a plurality of first strip-shaped grooves which are parallel to each other; a first metal wire is arranged in the first strip-shaped groove in a sintering mode; the front surface of the battery piece is printed with a thin grid line which is in contact with the first metal wire; the thin grid line and the first metal wire are arranged in a crossed mode, so that current in the thin grid line can converge towards the first metal wire.

In an optional embodiment of the present application, the battery further includes a second strip-shaped groove disposed at an edge position of the battery piece and communicated with an end portion of the same side of each first strip-shaped groove;

second metal wires electrically connected with the first metal wires are arranged in the second strip-shaped groove; and the second metal wire is electrically connected with the back negative electrode on the adjacent cell piece through a conductive belt.

In an optional embodiment of the present application, a third strip-shaped groove is disposed on the back surface of the battery piece, a third metal wire is disposed in the third strip-shaped groove, and the third metal wire is a negative electrode on the back surface of the battery piece.

In an optional embodiment of the present application, the third strip-shaped grooves and the first strip-shaped grooves are parallel to each other and have the same number, and each of the third metal wires and one of the first metal wires on the adjacent battery piece are electrically connected through a conductive tape.

In an optional embodiment of the present application, the third strip-shaped groove and the first strip-shaped groove are parallel to each other; the edge position of the back surface of the battery piece is also provided with a fourth strip-shaped groove communicated with the end part of the same side of each third strip-shaped groove; a fourth metal wire electrically connected with the third metal wires is arranged in the fourth strip-shaped groove; and the fourth metal wire is electrically connected with the first metal wire on the adjacent battery piece through a conductive band.

In an alternative embodiment of the present application, the first bar groove has a depth of 0.02mm to 0.3mm.

In an optional embodiment of the present application, the first metal wire is a copper wire or an aluminum wire.

In an alternative embodiment of the present application, the cross-section of the first wire is a circular section, a triangular section or a trapezoidal section.

In an optional embodiment of the present application, the first wire is fixed in the first bar groove by bonding with a conductive paste.

The utility model provides a photovoltaic cell component, which comprises a cell slice; the front surface of the battery piece is provided with a plurality of first strip-shaped grooves which are parallel to each other; a first metal wire is arranged in the first strip-shaped groove in a sintering mode; the front surface of the battery piece is printed with thin grid lines which are in contact with the first metal wires; the thin grid lines and the first metal wires are arranged in a crossed mode, so that current in the thin grid lines can be converged into the first metal wires.

When the metal wire for current convergence is arranged on the surface of the solar cell, a plurality of strip-shaped grooves are arranged on the surface of the solar cell, and then the metal wire is arranged in the strip-shaped grooves in a sintering mode; because the strip-shaped groove has a limiting effect on the metal wire, the metal wire can be limited to move on the surface of the cell, so that the stability of the metal wire fixed on the cell is ensured, and when the metal wire is packaged and fixed, the metal wire is not required to be subjected to complex pressing operation, the fixed packaging process of the metal wire is simplified to a certain extent, and the cost of the solar cell without the main grid is reduced.

Drawings

In order to clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 a cell in a photovoltaic cell module according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of another cell sheet of a photovoltaic cell module according to an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional structure diagram of a battery cell according to an embodiment of the present disclosure;

fig. 4 is a schematic view of a connection structure between adjacent battery plates according to an embodiment of the present application

Detailed Description

The metal wires arranged on the conventional solar cell without the main grid basically protrude out of the surface of the cell, so that the contact area between the metal wires and the surface of the cell is relatively smaller, the problem that the metal wires are moved to fall off easily occurs, and in order to ensure the stability of the metal wires fixed on the surface of the cell, complex equipment such as a laminating machine and the like needs to be adopted to fasten the metal wires tightly on the surface of the cell so as to improve the fastening performance of connection between the metal wires and the cell.

However, it is obvious that the conventional method for arranging the metal wires on the solar cell without the main grid is too complicated and needs other complicated equipment, so that the production cost of the solar cell is increased to a certain extent.

Therefore, the technical scheme that the production steps of the solar cell can be simplified to a certain extent and the production cost can be reduced is provided.

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a cell in a photovoltaic cell module provided in an embodiment of the present application, fig. 2 is a schematic structural diagram of another cell in a photovoltaic cell module provided in an embodiment of the present application, fig. 3 is a schematic sectional structural diagram of a cell provided in an embodiment of the present application, and fig. 4 is a schematic structural diagram of connection between adjacent cells provided in an embodiment of the present application. The photovoltaic cell assembly may include:

a battery piece 10;

the front surface of the battery piece 10 is provided with a plurality of mutually parallel first strip-shaped grooves 12;

a first metal wire 13 is arranged in the first strip-shaped groove 12 in a sintering mode; the front surface of the battery piece 10 is printed with a thin grid line 11 which is contacted with a first metal wire 13;

the thin gate line 11 and the first metal wire 13 are arranged to intersect with each other, so that the current in the thin gate line 11 is converged into the first metal wire 13.

In the actual production process of forming the battery piece, the prepared and shaped battery piece 10 can be grooved by laser or other means to form a plurality of first strip-shaped grooves 12 which are parallel to each other. The number of the first strip-shaped grooves 12 can be reasonably set based on the size of the battery piece 10, and generally, the first strip-shaped grooves 12 should be uniformly laid on the front surface of the battery piece 10 at equal intervals.

It can be understood that, since the first wire 13 is disposed in the first bar groove 12, the position where the first bar groove 12 is disposed is the position where the first wire 13 is disposed. To realize the current convergence of the first metal wires 13 to the thin gate lines 11, obviously, the thin gate lines 11 and the first metal wires 13 need to be arranged in a crossing manner, so that each first metal wire 13 can be electrically connected with a plurality of thin gate lines 11 at the same time, and the current convergence effect to the plurality of thin gate lines 11 is achieved. The first stripe-shaped groove 12, in which the first wire 13 is disposed, should also be disposed to cross each of the thin grating lines 11.

Alternatively, the first stripe-shaped groove 12 may be disposed perpendicular to each other with respect to the thin gate lines 11. Of course, in practical applications, it is not excluded that the first bar-shaped grooves 12 and the thin grid lines 11 are disposed in a non-perpendicular intersecting manner, for example, an included angle between a central axis of the first bar-shaped groove 12 and the thin grid lines 11 may be set to about 60 degrees.

In addition, in a photovoltaic cell module, the photovoltaic cell module generally comprises a plurality of cell sheets 10 electrically connected to each other; in addition, each cell 10 generally has a positive electrode disposed on the front surface of the cell 10 and a negative electrode disposed on the back surface of the cell 10, so that when a plurality of cells 10 are electrically connected in series, the positive and negative electrodes between adjacent cells 10 need to be connected.

Referring to fig. 4, in practical applications, the conductive tape 15 in a zigzag structure may be used to electrically connect two adjacent battery pieces 10. One end of the conductive tape 15 is connected with the first metal wire 13 on the front surface of one of the two adjacent battery pieces 10, and the middle section of the conductive tape 15 extends to the back surface of the other battery piece 10 of the two battery pieces 10 through the gap between the two battery pieces 10 and is connected with the negative electrode on the back surface of the battery piece 10.

It can be understood that if the first metal wires 13 are laid on the front surface of the cell piece 10 and the extending direction of the conductive strips 15 is parallel to the straight line of the first metal wires 13, a conductive strip 15 needs to be arranged on each first metal wire 13, and one end of each conductive strip 15 is connected to one first metal wire 13 and the other end is connected to the negative electrode on the back surface of the adjacent cell piece 10 of the cell piece 10 where the first metal wire 13 is located.

In order to further reduce the number of used conductive strips 15, in an alternative embodiment of the present application, the conductive strips 15 may extend in a direction perpendicular to the first metal wires 13 at the front portion of the battery piece 10, or intersect the first metal wires 13 at the edge position of the battery piece 10, so that one conductive strip 15 can be connected to each first metal wire 13 at the same time.

Of course, to reduce the number of the conductive strips 15, the above embodiment is not necessarily adopted, and in another optional embodiment of the present application, the following may be further included:

a second strip-shaped groove 14 which is arranged at the edge position of the battery piece 10 and is communicated with the same side end part of each first strip-shaped groove 12;

second metal wires electrically connected with the first metal wires 13 are arranged in the second strip-shaped groove 14; and the second wire is electrically connected to the back negative electrode of the adjacent cell sheet 10 through the conductive tape 15.

Referring to fig. 2, in the embodiment shown in fig. 2, the second strip-shaped groove 14 and the first strip-shaped groove 12 are perpendicular to each other and communicate with each other, so that the second wire in the second strip-shaped groove 14 and the first wire 13 in the first strip-shaped groove 12 are perpendicular to each other and are in contact connection with each other, so that each first wire 13 is electrically connected with the same second wire; on the basis, the second metal wire is electrically connected with the back negative electrode of the adjacent cell piece 10 through the conductive belt 15; only one conductive tape 15 and the second metal wire are required to be electrically connected at this time, so that the electrical connection between all the first metal wires 13 and the back negative electrodes of the adjacent battery pieces 10 can be realized.

Based on the above discussion, it is mainly explained that the conductive structure on the front surface of the cell piece 10 is distributed on the back surface of the cell piece 10, and in the conventional case, a plurality of negative electrodes protruding from the back surface of the cell piece 10 are arranged. When the front positive electrodes and the back negative electrodes of the adjacent battery pieces 10 are actually connected through the conductive strips 15, one end of the conductive strip 15 connected with the back negative electrode needs to extend across the width of the whole battery piece 10, so as to ensure that the same conductive strip 15 can be simultaneously connected with a plurality of back negative electrodes.

However, this also requires a large number of conductive strips 15 to be disposed on the back side of the battery plate 10, and for this reason, in an alternative embodiment of the present application, the conductive strips may be further included

A third strip-shaped groove is formed in the back of the battery piece 10, a third metal wire is arranged in the third strip-shaped groove, and the third metal wire is a negative electrode on the back of the battery piece 10.

In the process of manufacturing the battery piece 10 in this embodiment, a negative electrode is not required to be specially arranged on the back surface of the battery piece 10, but a third strip-shaped groove is formed in the back surface of the battery piece 10, a third metal wire is arranged in the third strip-shaped groove, and the third metal wire is used as the negative electrode on the back surface of the battery piece 10, so that each third metal wire is connected with the first metal wire 13 on the front surface of the adjacent battery piece 10 through the conductive belt 15, and the electrical connection between the adjacent battery pieces 10 can be realized.

When the third strip-shaped grooves are actually arranged, the number of the first strip-shaped grooves on the front surface and the number of the third strip-shaped grooves on the back surface of each battery piece 10 can be equal, and the first strip-shaped grooves 12 and the third strip-shaped grooves can be parallel to each other. It is understood, of course, that in practice it is not excluded that the first and

third grooves

12, 12 are perpendicular or at an angle to each other.

Similar to the second strip-shaped groove 14, in another alternative embodiment of the present application, a third strip-shaped groove and a third wire may be further disposed on the back surface of the battery piece 10, and a fourth strip-shaped groove and a fourth wire may be further disposed on the back surface of the battery piece 10, and specifically may include:

the edge position of the back surface of the battery piece is provided with a fourth strip-shaped groove communicated with the end part of the same side of each third strip-shaped groove; a fourth metal wire electrically connected with the third metal wires is arranged in the fourth strip-shaped groove; and the fourth wire is electrically connected to the first wire 13 of the adjacent cell via the conductive tape 15.

In the present embodiment, as for the layout positional relationship between the third wire and the fourth wire, the layout positional relationship between the first wire 13 and the second wire can be fully referred to. In practical applications, the first wire 13 and the third wire may be parallel to each other, and the second wire and the fourth wire may also be parallel to each other; in order to simplify the installation, on the same cell 10, the second metal wires on the front side and the fourth metal wires on the back side should be respectively located on different two sides of the cell, and on two adjacent cells 10, the second metal wires on one cell 10 and the fourth metal wires on the other cell 10 should be respectively located on two sides of the two cells that are close to each other; therefore, when the first metal wires 13 and the third metal wires are connected through the conductive belts 15, the conductive belts are only required to be connected with the second metal wires and the fourth metal wires on the two adjacent battery pieces 10, and the battery pack is simple in structure and convenient to assemble.

The first strip-shaped groove 12, the second strip-shaped groove 14, the third strip-shaped groove and the fourth strip-shaped groove on the battery piece 10 can be strip-shaped grooves with the same structure, and the depths of the first strip-shaped groove 12, the second strip-shaped groove 14, the third strip-shaped groove and the fourth strip-shaped groove can be set to be 0.02mm-0.3mm. Accordingly, the first wire 13, the second wire, and the third wire may be three kinds of wires that are identical; in order to ensure that the strip-shaped groove can better limit the metal wire, the radius of the cross section of any one of the first metal wire 13, the second metal wire, the third metal wire and the fourth metal wire can be less than or equal to the depth of the strip-shaped groove. In addition, each metal wire can be a copper wire or an aluminum wire, and the cross section of each metal wire is any one or more of a circular section, a triangular section or a trapezoidal section, which is not particularly limited in this embodiment; the wire is fixed in the first strip-shaped groove 12 by means of conductive paste.

In summary, when the metal wire for current convergence is arranged on the surface of the solar cell, a plurality of first bar-shaped grooves are arranged on the surface of the solar cell, and then the first metal wire is arranged in the first bar-shaped grooves in a sintering manner; because the first strip-shaped groove has a limiting effect on the first metal wire, the first metal wire can be limited to move on the surface of the cell, so that the stability of the first metal wire in fixation on the cell is ensured, and when the first metal wire is packaged and fixed, the first metal wire is not required to be subjected to complex pressing operation, the fixed packaging process of the first metal wire is simplified to a certain extent, and the cost of the solar cell which is not good is reduced.

It should be noted that, in this document, 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. Furthermore, 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 elements inherent in the list. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the technical solutions provided in the embodiments of the present application that are consistent with implementation principles of corresponding technical solutions in the prior art are not described in detail, so as to avoid redundant description.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above description of the embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A photovoltaic cell assembly, comprising a cell sheet; the front surface of the battery piece is provided with a plurality of first strip-shaped grooves which are parallel to each other; a first metal wire is arranged in the first strip-shaped groove in a sintering mode; the front surface of the battery piece is printed with a thin grid line which is in contact with the first metal wire; the thin grid line and the first metal wire are arranged in a crossed mode, so that current in the thin grid line can converge towards the first metal wire.

2. The photovoltaic cell module according to claim 1, further comprising a second strip-shaped groove disposed at an edge of the cell sheet and communicating with the same-side end of each of the first strip-shaped grooves;

3. The photovoltaic cell assembly according to claim 1 or 2, wherein the back surface of the cell sheet is provided with a third strip-shaped groove, a third metal wire is arranged in the third strip-shaped groove, and the third metal wire is a negative back surface electrode of the cell sheet.

4. The assembly according to claim 3, wherein the third grooves and the first grooves are parallel to each other and are equal in number, and each of the third wires is electrically connected to one of the first wires on the adjacent cell piece by a conductive tape.

5. The assembly according to claim 3, wherein the third strip-shaped groove and the first strip-shaped groove are parallel to each other; the edge position of the back surface of the battery piece is also provided with a fourth strip-shaped groove communicated with the same side end part of each third strip-shaped groove; a fourth metal wire electrically connected with the third metal wires is arranged in the fourth groove; and the fourth metal wire is electrically connected with the first metal wire on the adjacent battery piece through a conductive band.

6. The photovoltaic cell assembly according to claim 1, wherein the first bar-shaped groove has a depth of 0.02mm to 0.3mm.

7. The photovoltaic cell assembly according to claim 1, wherein the first metal wire is a copper wire or an aluminum wire.

8. The assembly according to claim 1, wherein the first wire has a cross-section that is circular, triangular, or trapezoidal.

9. The assembly defined in claim 1, wherein the first wire is adhesively secured in the first linear groove by a conductive paste.