CN103762254A - Electrode grid line structure, solar battery piece with electrode grid line structure and module - Google Patents

Abstract

The invention discloses an electrode grid structure, comprising at least one main grid line and a plurality of thin grid lines, the main grid line and the thin grid lines are perpendicular to each other and intersect; the main grid line includes at least two main grid line units and at least A thin busbar, the width of the busbar unit is greater than the width of the thin busbar, and the width of the thin busbar is greater than the width of the thin busbar. The electrode grid structure provided by the present invention sets the busbar into a segmented structure, so that the width of the busbar unit can be kept consistent with the width of the busbar of the two-grid solar cells and the three-grid solar cells. Reduce the width of the thin busbars, which can improve the alignment accuracy of the busbars and the interconnection strips of the multi-grid solar cells during component processing, reduce the shading area of the metal electrodes of the multi-grid solar cells, and improve the multi-grid solar cells. Conversion efficiency of solar cells. The invention also correspondingly provides a multi-grid solar battery sheet and a multi-grid solar battery component with the electrode grid line structure.

Description

Electrode grid line structure and solar cells and components with the electrode grid line structure

technical field

The invention relates to the technical field of solar cells, in particular to an electrode grid line structure and a solar battery sheet and assembly with the electrode grid line structure.

Background technique

Photovoltaic power generation is one of the main ways to use solar energy at present. Because of its cleanness, safety, convenience, and high efficiency, solar photovoltaic power generation has become an emerging industry that is generally concerned and focused on development by countries all over the world. Therefore, in-depth research and utilization of solar energy resources is of great significance to alleviate the resource crisis and improve the ecological environment.

The solar cell module is composed of tempered glass, a first encapsulating adhesive layer, a solar cell sheet layer, a second encapsulating adhesive layer and a back plate in sequence. Wherein, the solar cell sheet layer includes multiple groups of solar cell strings. Each group of solar battery strings includes a plurality of solar battery slices, each solar battery slice is provided with a busbar on the front side, and its back side is provided with a back electrode, and a plurality of solar battery slices are sequentially connected through interconnection bars to form the solar battery string . Specifically, the busbars of the previous solar cell and the back electrodes of adjacent solar cells are connected to each other through interconnection bars in sequence.

The solar cells in a traditional solar cell module are usually provided with only two or three busbars, and such solar cells are called two-grid or triple-grid solar cells.

In order to further increase the output power of solar cell modules, multi-grid solar cells such as four-grid solar cells and five-grid solar cells have become a hot spot in industry research. The difference between multi-grid solar cells and traditional two-grid and triple-grid solar cells is that the number of busbars is increased from two or three to more, and the width of the busbars is narrowed. However, the busbars are metal electrodes, and the increase of the busbars will increase the light-shielding area of the metal electrodes, thereby affecting the conversion efficiency of the solar cell. Therefore, in order not to increase the light-shielding area of the metal electrodes, generally speaking, the greater the number of busbar lines, the narrower the width of the busbar lines will be set.

However, the narrower the width of the busbars, the higher the requirements for the alignment accuracy of the interconnectors and the busbars when the solar cell modules are connected. In addition, the increase in the number of the busbars reduces the working efficiency of the solar cell module connections and increases the Fragmentation rate of solar cells and usage of interconnection strips. Therefore, the traditional module connection technology restricts the industrial production of multi-grid solar cells.

Therefore, it is necessary to improve the existing electrode grid line structure.

Contents of the invention

An object of the present invention is to provide an electrode grid structure to improve the alignment accuracy of busbars and interconnectors of a multi-grid solar cell.

Another object of the present invention is to provide a multi-grid solar cell to improve the alignment accuracy of the busbars and interconnection bars of the multi-grid solar cell while reducing the shading area of the metal electrodes of the multi-grid solar cell.

Yet another object of the present invention is to provide a multi-grid solar cell module to improve the alignment accuracy of the busbars and the interconnection bars of the multi-grid solar cell, and reduce the shading area of the metal electrodes of the multi-grid solar cell.

In order to achieve the above object, the present invention provides an electrode grid line structure on the one hand, including at least one main grid line and a plurality of thin grid lines, each main grid line and the plurality of thin grid lines are perpendicular to each other and intersect each other; each The busbars include:

A first busbar unit and a second busbar unit, the first busbar unit and the second busbar unit are respectively arranged at both ends of the busbar length direction, and are perpendicular to the Multiple fine grid lines;

at least one thin busbar line, connecting the first busbar unit and the second busbar unit, and perpendicular to the plurality of thin busbars;

Wherein, the width of the first busbar unit and the second busbar unit is larger than the width of the thin busbar, and the width of the thin busbar is larger than the width of the thin busbar; and the The width of the first busbar unit and the second busbar unit is 0.8mm-1.8mm.

Preferably, the busbar unit is a hollow structure with a tip at one end or a segmented hollow structure or a segmented solid structure or a solid structure with a tip at one end.

Preferably, the thin busbars have a width of 0.015mm-1.5mm, and the thin busbars have a width of 0.01mm-0.1mm.

Preferably, the length of the first busbar unit and/or the second busbar unit is 1.5mm-75mm.

In order to achieve the above object, another aspect of the present invention provides a multi-grid solar cell, the front of the multi-grid solar cell is provided with the above-mentioned electrode grid line structure, and its back is provided with an aluminum back field and a plurality of back electrodes; Wherein, the plurality of back electrodes are segmented back electrodes, and the positions of the back electrodes correspond to the positions of the first busbar unit and the second busbar unit on the front side.

Preferably, the busbar unit is a hollow structure with a tip at one end or a segmented hollow structure or a segmented solid structure or a solid structure with a tip at one end.

Preferably, the thin busbars have a width of 0.015mm-1.5mm, and the thin busbars have a width of 0.01mm-0.1mm.

Preferably, the length of the first busbar unit and/or the second busbar unit is 1.5mm-75mm.

In order to achieve the above object, the present invention also provides a multi-grid solar cell assembly, comprising at least two of the above-mentioned multi-grid solar cells, two adjacent multi-grid solar cells are connected by interconnecting bars, and one end of the interconnecting bars It is covered on the first busbar unit or the second busbar unit of one multi-grid solar cell in two adjacent multi-grid solar cells, and the other end of the interconnection bar is covered on another multi-grid solar cell on the corresponding segmented back electrode.

Preferably, the interconnection strips have a width of 0.8mm-1.8mm.

Compared with the prior art, the present invention has the following advantages and positive effects due to the adoption of the above technical solutions:

1) In the electrode grid structure provided by the present invention, its busbar includes a first busbar unit, a second busbar unit and at least one thin busbar, wherein the first busbar unit or the second busbar The grid line unit is used to connect with the interconnection bar, and the thin main grid line is used to collect the current on the thin grid line intersecting with it, and the thin main grid line does not need to cover the interconnection bar; by connecting the first main grid line The width of the unit and the second busbar unit is consistent with the width of the busbars of the two-grid solar cell and the triple-grid solar cell, thereby improving the efficiency of the busbar and the interconnection bars of the multi-grid solar cell module during processing. Alignment accuracy;

2) Since the width of the thin busbars of the electrode grid structure provided by the present invention is smaller than the widths of the first busbar unit and the second busbar unit, and the thin busbars do not need to cover interconnection bars , so under the condition that the widths of the first busbar unit and the second busbar unit are constant, the length of the thin busbars not covered by the interconnection bars is lengthened and the width is narrowed to reduce the cost of multi-grid solar cells. The shading area of the metal electrode of the sheet, thereby improving the conversion efficiency of the multi-grid solar cell sheet;

3) Since the back of the multi-grid solar cell provided by the present invention is provided with multiple back electrodes and aluminum back fields, the multiple back electrodes are all segmented back electrodes, which saves the amount of silver paste used for printing the back electrodes ; At the same time, the position of the back electrode corresponds to the position of the front busbar unit, which facilitates the connection of multi-grid solar cells to components;

4) In the multi-grid solar cell module provided by the present invention, one end of the interconnection bar is covered on the busbar unit of a multi-grid solar cell, and the other end is covered on the segment on the back of another adjacent multi-grid solar cell. On the back electrode, so as to realize the interconnection between two adjacent multi-grid solar cells. The interconnection method is simple and convenient.

Description of drawings

FIG. 1A is a schematic diagram of an electrode grid line structure provided by an embodiment of the present invention;

FIG. 1B is a partially enlarged view of the first bus bar unit in FIG. 1A;

FIG. 2 is a schematic diagram of an electrode grid line structure provided by another embodiment of the present invention.

3 is a schematic diagram of a back electrode structure provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a multi-grid solar cell module provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of the connection between the interconnection bar and the busbar unit of the multi-grid solar cell provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of the connection between interconnection bars and segmented back electrodes of multi-grid solar cells provided by an embodiment of the present invention.

Detailed ways

The electrode grid line structure proposed by the present invention and the solar cells and components with the electrode grid line structure will be further described in detail below with reference to the drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in very simplified form and use imprecise ratios, which are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present invention.

Regarding the electrode grid line structure, two examples are given below for specific description.

Example 1

Please refer to FIG. 1A. FIG. 1A is a schematic diagram of an electrode grid structure provided by an embodiment of the present invention. As shown in FIG. Four main grid lines 10 and a plurality of thin grid lines 11, the thin grid lines 11 are used to collect the electron current of the solar cells; each main grid line 10 and a plurality of thin grid lines 11 are mutually perpendicular and intersect; each main grid line The line 10 includes a first busbar unit 101, a second busbar unit 102 and two thin busbars, denoted as a first thin busbar 10A and a second thin busbar 10B; wherein:

The first busbar unit 101 and the second busbar unit 102 are respectively arranged at both ends of the busbar 10 in the length direction, and are perpendicular to the thin gridline 11; the first busbar unit 101 and the second busbar unit 102 is connected with the first thin busbar 10A and the second thin busbar 10B, and the first thin busbar 10A and the second thin busbar 10B are perpendicular to the thin busbar 11 for collecting the intersecting thin busbars 11 The current on the gate line 11. The width of the first busbar unit 101 and the second busbar unit 102 is greater than the width of the first thin busbar 10A and the second thin busbar 10B, and the first thin busbar 10A and the second thin busbar The width of the line 10B is larger than the width of the fine gate line 11 .

The electrode grid structure provided in this embodiment is configured by setting the busbars into a segmented structure, specifically including the first busbar unit 101, the first thin busbar 10A, the second thin busbar 10B and the second The busbar unit 102, by keeping the width of the first busbar unit 101 and the second busbar unit 102 consistent with the width of the busbars of the two-grid solar cell sheet and the three-grid solar cell sheet, can increase the The alignment accuracy of the main grid lines and the interconnection strips of the grid solar cells during component processing.

In this embodiment, the first busbar unit 101 and the second busbar unit 102 are hollow connection parts, as shown in FIG. 1B ; since the heights are uneven, it is more convenient to connect with interconnection bars.

Wherein, the width of the first busbar unit 101 and the second busbar unit 102 is 0.8mm-1.8mm, which is consistent with the width of busbars of two-grid solar cells and three-grid solar cells. It should be noted that the number of busbars and the length of busbar units on each busbar are not particularly limited in this example, and the number of busbar units contained in each busbar is not limited Preferably, the length of the busbar unit (for example, the first busbar unit 101 and/or the second busbar unit 102 ) is 1.5mm-75mm. Depending on the number of busbars of the solar cells, busbar units with different numbers and lengths can be selected to form the busbar. Moreover, the lengths of the first busbar unit 101 and the second busbar unit 102 may be the same or different, and the lengths thereof are determined according to the welding tension with the interconnection bar and the output power of the assembly.

Preferably, the width of the first thin busbar 10A and the second thin busbar 10B is 0.015mm-1.5mm, and the width of the thin busbar 11 is 0.01mm-0.1mm. However, the present invention is not limited thereto, generally it is only necessary to control the width of the thin busbars to be smaller than the width of the busbar unit and larger than the width of the thin busbars.

It should be noted that, in this embodiment, a polycrystalline solar battery sheet with four busbar lines of 156 mm×156 mm is taken as an example for detailed description. Those skilled in the art should be able to understand that the solar cells provided in this embodiment are not limited to polycrystalline solar cells with four busbars of 156 mm × 156 mm, but can also be crystalline silicon with other sizes and numbers of busbars. Solar cells. For example, the number of busbar lines may be 3-15.

Example 2

Please refer to Fig. 2, Fig. 2 is the schematic diagram of the electrode grid line structure that another embodiment of the present invention provides; As shown in Fig. 2, the electrode grid line structure in the present embodiment and the electrode grid line structure provided in the first embodiment The structure differs in that:

In order to reduce the stress between the interconnection bar and the edge of the solar cell, and reduce the carrier recombination of the busbar unit (such as the first busbar unit 101 and the second busbar unit 102), the busbar unit (such as the first busbar unit 101 and the second busbar unit 102) A busbar unit 101 and a second busbar unit 102) can be optimized into a segmented structure with a tip at one end, at this time each busbar unit (such as the first busbar unit 101 or the second busbar unit 102) is divided into two sections, the section close to the edge of the solar cell has a tapered structure, and the two sections are connected by thin bus bars.

Except for this difference, the electrode grid line structure provided by this embodiment is the same as that of Embodiment 1, which will not be repeated here.

It should be noted that the specific structure of the busbar unit (such as the first busbar unit 101 and the second busbar unit 102 ) provided by the present invention is not limited to the specific structures given in the above two embodiments. The line units (for example, the first busbar unit 101 and the second busbar unit 102 ) may also be a hollow structure with a tip at one end or a segmented hollow structure or a segmented solid structure.

For the multi-grid solar cells provided by the present invention, please refer to the introduction below.

The front side of the multi-grid solar battery provided by the invention is provided with an electrode grid line structure, and the back side is provided with an aluminum back field and a plurality of back electrodes.

For the structure of the electrode grid lines, please refer to the descriptions of Embodiment 1 and Embodiment 2 above, and details will not be repeated here.

Please refer to FIG. 3 for the structure of the back electrode. As shown in FIG. 3 , four segmented back electrodes 20 are arranged on the back of the multi-grid solar cell, and the back electrode 20 includes a first electrode 201 and a second electrode 202. The length and width of the first electrode 201 and the second electrode 202 can be determined according to the output power of the multi-grid solar cell. The positions of the first electrode 201 and the second electrode 202 correspond to the positions of the first busbar unit 101 and the second busbar unit 102 respectively. In this embodiment, the back electrode is arranged in a segmented structure, thereby saving the amount of silver paste used for printing the back electrode. And by corresponding the position of the back electrode to the position of the front busbar unit, it is convenient for multi-grid solar cells to realize component connection.

For the multi-grid solar cell module provided by the present invention, please refer to the introduction below.

As shown in FIG. 4 , the multi-grid solar cell assembly provided by the present invention includes a first multi-grid solar cell 31 and a second multi-grid solar cell 32; wherein, in this embodiment, the first multi-grid solar cell 31 The specification is the same as that of the second multi-grid solar battery sheet 32 , the front side is provided with electrode grid structure, and the back side is provided with aluminum back field and a plurality of back electrodes. The first multi-grid solar cells 31 and the second multi-grid solar cells 32 are connected by interconnection bars 30 . This embodiment is only described by taking two multi-grid solar cells as an example, however, the present invention is not limited thereto, and may also include other numbers of multi-grid solar cells.

The structure of the first multi-grid solar cell 31 and the second multi-grid solar cell 32 is the same as that of the multi-grid solar cell described above, and will not be repeated here.

Please refer to Fig. 5 to Fig. 6 for the specific connection mode between the multi-grid solar cells and the interconnection bars in the multi-grid solar cell module provided by the present invention. As shown in Fig. 5, one end of the interconnection bar 30 covers the first multi-grid solar cell Each second busbar unit 102 at one end of the sheet 31 is connected to the first multi-grid solar battery sheet 31 through the second busbar unit 102; It can also be covered on each first bus bar unit 101 at one end of the first multi-grid solar battery sheet 31 . As shown in FIG. 6 , the other end of the interconnection bar 30 covers the segment electrode at one end of the back electrode of the second multi-grid solar cell 32 , and is connected to the second multi-grid solar cell 32 through the segment electrode. Wherein, the width of the interconnection bar 30 may be 0.8mm-1.8mm.

Through the above connection method, the interconnection bar 30 interconnects the first multi-grid solar cells 31 and the second multi-grid solar cells 32 . When the multi-grid solar battery assembly includes multiple multi-grid solar battery slices, the interconnection of adjacent multi-grid solar battery slices is also realized through this connection.

Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. An electrode grid structure, characterized in that it comprises at least one main grid line and a plurality of thin grid lines, each main grid line and the plurality of thin grid lines are mutually perpendicular and intersect; each main grid line include: A first busbar unit and a second busbar unit, the first busbar unit and the second busbar unit are respectively arranged at both ends of the busbar length direction, and are perpendicular to the Multiple fine grid lines; at least one thin busbar line, connecting the first busbar unit and the second busbar unit, and perpendicular to the plurality of thin busbars; Wherein, the width of the first busbar unit and the second busbar unit is larger than the width of the thin busbar, and the width of the thin busbar is larger than the width of the thin busbar; and the The width of the first busbar unit and the second busbar unit is 0.8mm-1.8mm. 2 . The electrode grid structure according to claim 1 , wherein the busbar unit is a hollow structure with a tip at one end or a segmented hollow structure or a segmented solid structure or a solid structure with a tip at one end. 3 . 3 . The electrode grid structure according to claim 1 , wherein the width of the thin busbars is 0.015 mm-1.5 mm, and the width of the thin grid lines is 0.01 mm-0.1 mm. 4 . The electrode grid structure according to claim 1 , wherein the length of the first busbar unit and/or the second busbar unit is 1.5mm-75mm. 5. A multi-grid solar cell, characterized in that the front side of the multi-grid solar cell is provided with the electrode grid structure as claimed in claim 1, and its back is provided with an aluminum back field and a plurality of back electrodes; wherein , the plurality of back electrodes are segmented back electrodes, and the positions of the back electrodes correspond to the positions of the first busbar unit and the second busbar unit on the front side. 6. The multi-grid solar cell according to claim 5, wherein the busbar unit is a hollow structure with a tip at one end or a segmented hollow structure or a segmented solid structure or a solid structure with a tip at one end. 7 . The multi-grid solar battery sheet according to claim 5 , wherein the thin busbars have a width of 0.015mm-1.5mm, and the thin busbars have a width of 0.01mm-0.1mm. 8 . The multi-grid solar battery sheet according to claim 5 , wherein the length of the first busbar unit and/or the second busbar unit is 1.5mm-75mm. 9. A multi-grid solar cell assembly, characterized in that it comprises at least two multi-grid solar cells as claimed in claim 5, and two adjacent multi-grid solar cells are connected by interconnecting bars, and the interconnecting bars One end of the interconnection bar is covered on the first busbar unit or the second busbar unit of one multi-grid solar cell in two adjacent multi-grid solar cells, and the other end of the interconnection bar is covered on the other multi-grid solar cell On the segmented back electrodes corresponding to the cells. 10. The multi-grid solar cell module according to claim 1, wherein the width of the interconnection bars is 0.8mm-1.8mm.

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