CN217881544U - Double-sided laminated solar cell, cell module and photovoltaic system - Google Patents

Abstract

The application is suitable for the technical field of solar cells and provides a double-sided laminated solar cell, a cell module and a photovoltaic system. The double-sided laminated solar cell comprises a first cell, a second cell and a third cell which are sequentially laminated, wherein the second cell comprises an intermediate cell, and the band gap of each cell is gradually increased along the direction from the intermediate cell to the first cell; the band gap of each cell gradually increases in the direction from the intermediate cell to the third cell. In this way, the band gap of each cell gradually increases from the middle to the outside, so that efficient double-sided power generation can be realized, which is advantageous for improving photoelectric conversion efficiency.

Description

Double-sided laminated solar cell, cell module and photovoltaic system

Technical Field

The application belongs to the technical field of solar cells, and particularly relates to a double-sided laminated solar cell, a cell module and a photovoltaic system.

Background

Solar cell power generation is a sustainable clean energy source that can convert sunlight into electrical energy using the photovoltaic effect of semiconductor p-n junctions.

In the related art, the stacked cell is generally a single-sided cell, and can only generate power well on the front side, and the power generation effect on the back side is poor. Thus, the laminated cell as a whole cannot utilize sunlight well, resulting in a low photoelectric conversion rate.

Therefore, how to improve the photoelectric conversion efficiency of the tandem cell becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The application provides a double-sided laminated solar cell, a cell module and a photovoltaic system, and aims to solve the problem of how to improve the photoelectric conversion efficiency of the laminated cell.

In a first aspect, a double-sided tandem solar cell provided by the present application includes a first cell, a second cell, and a third cell stacked in sequence, where the second cell includes an intermediate cell, and a band gap of each cell gradually increases along a direction from the intermediate cell to the first cell; the band gap of each cell gradually increases in a direction from the intermediate cell to the third cell.

Optionally, the first cell has a band gap of 1eV to 2.5eV.

Optionally, the band gap of the third cell is between 1eV and 2.5eV.

Optionally, the intermediate cell has a band gap of 0.7eV to 2eV.

Optionally, the number of the second batteries is one, and the intermediate battery is the second battery.

Optionally, the number of the second batteries is odd and plural, the number of the intermediate battery is one, and the intermediate battery is located at an intermediate position of the plurality of second batteries.

Optionally, the number of the second batteries is a plurality of even numbers, the number of the middle batteries is two, and the two middle batteries are respectively located at two sides of the middle position of the plurality of second batteries.

Optionally, the bandgaps of the two intermediate cells are the same; alternatively, the bandgaps of the two intermediate cells are different.

In a second aspect, the present application provides a battery module comprising the bifacial tandem solar cell of any one of the above.

In a third aspect, the present application provides a photovoltaic system including the above-described cell assembly.

According to the double-sided laminated solar cell, the cell module and the photovoltaic system, the band gaps of the cells are gradually increased from the middle to the outside, so that efficient double-sided power generation can be realized, and the photoelectric conversion efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of a bifacial tandem solar cell in accordance with an embodiment of the present application;

fig. 2 is a schematic structural diagram of a double-sided tandem solar cell according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a double-sided tandem solar cell according to an embodiment of the present application;

description of the main element symbols:

the double-sided tandem solar cell comprises a double-sided tandem solar cell 10, a first cell 11, a second cell 12, a first sub-cell 121, a second sub-cell 122, a third sub-cell 123 and a third cell 13.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The battery in the related art generally generates electricity on a single side. The band gap of each battery is gradually increased from the middle to the outside, so that efficient double-sided power generation can be realized.

Example one

Referring to fig. 1, a double-sided tandem solar cell 10 according to an embodiment of the present disclosure includes a first cell 11, a second cell 12, and a third cell 13 stacked in sequence, where the second cell 12 includes an intermediate cell, and a band gap of each cell gradually increases along a direction from the intermediate cell to the first cell 11; the band gap of each cell gradually increases in the direction from the intermediate cell to the third cell 13.

In the double-sided tandem solar cell 10 according to the embodiment of the present application, since the band gap of each cell gradually increases from the middle to the outside, efficient double-sided power generation can be realized, which is advantageous for improving the photoelectric conversion efficiency.

Note that the number of the first cell 11 and the third cell 13 is one, and the outermost two cells in the double-sided tandem solar cell 10 are shown. The number of the second batteries 12 may be one or more, and is a battery provided between the first battery 11 and the third battery 13. In other words, the number of cells of the double-sided tandem solar cell 10 is at least 3, and may be 4, 5, 6, or other numbers.

Specifically, the first cell 11 may be a crystalline silicon cell, and may also be a thin film cell.

Further, in the case where the first cell 11 is a crystalline silicon cell, it may be a polycrystalline silicon passivated contact cell, an interdigitated back contact cell (IBC cell), an HJT cell (heterojunction cell), a TOPCon cell (tunnel oxide layer passivated contact cell), a MWT cell (metal wrap through cell) or a PERC cell (passivated emitter back solar cell), a TBC solar cell (tunnel oxide layer passivated contact back contact cell), an HBC cell (heterojunction back contact cell), or the like.

Further, in the case where the first cell 11 is a thin film cell, it may be a double-sided contact thin film cell, an interdigitated back contact thin film cell, or the like.

Please note that, the specific types of the second battery 12 and the third battery 13 can be referred to the above, and are not described herein again to avoid redundancy.

Specifically, the specific type of the second battery 12 may be the same as the first battery 11, or may be different from the first battery 11. The specific type of the third battery 13 may be the same as the first battery 11 or may be different from the first battery 11. The specific type of the third battery 13 may be the same as the second battery 12 or may be different from the second battery 12. In the case where the number of the second batteries 12 is plural, the types of the plural second batteries 12 may be all the same, partially the same, or all different.

In this embodiment, the intermediate cell is a polysilicon passivated contact cell.

Alternatively, the first cell 11, the second cell 12, and the third cell 13 may be completely overlapped in projection in the thickness direction. In this way, light rays sequentially enter the plurality of sub-cells of the double-sided tandem solar cell 10 from both sides, so that the advantage that the band gap gradually decreases from outside to inside can be fully exerted, double-sided power generation can be efficiently realized, and the photoelectric conversion efficiency can be improved. Moreover, the double-sided laminated solar cell 10 is neat in appearance and convenient to use.

It is understood that, of the first cell 11, the second cell 12, and the third cell 13, the projections of any two cells in the thickness direction may partially overlap, completely be staggered, contained, or be contained. The specific positional relationship of the first battery 11, the second battery 12, and the third battery 13 is not limited herein.

Optionally, in the double-sided tandem solar cell 10, an insulating layer is disposed between at least one group of adjacent cells. Therefore, the two adjacent batteries are electrically isolated, the current matching of the two adjacent batteries is avoided, and the efficiency limitation caused by the current matching is avoided.

Specifically, in the bifacial stacked solar cell 10, an insulating layer is provided between adjacent cells. Therefore, all the two adjacent batteries are electrically isolated, and the efficiency limitation caused by current matching is avoided to the maximum extent.

Specifically, the insulating layer is a transparent insulating layer. Therefore, the insulating layer can transmit sunlight, the sunlight is prevented from being shielded by the insulating layer, and the photoelectric conversion efficiency of the double-sided laminated solar cell 10 is improved.

Specifically, the light transmittance of the insulating layer is in a range of 80% or more. For example, 80%, 82%, 85%, 87%, 89%, 90%, 92%, 95%, 97%, 99%, 100%. So for the light transmissivity of insulating layer is in suitable scope, avoids leading to the sunlight to be difficult to see through because the light transmissivity is less, thereby avoids the shading of insulating layer to lead to the photoelectric conversion efficiency lower.

Optionally, the insulating layer comprises at least one of glass, EVA glue, silicone. For example, one, two or three of glass, EVA glue and organic silicon.

Optionally, in the double-sided stacked solar cell 10, a tunneling conductive layer is disposed between at least one group of adjacent cells. Therefore, electrical interconnection is achieved between two adjacent batteries, the arrangement of an insulating layer is avoided, and cost reduction is facilitated.

Specifically, in the bifacial stacked solar cell 10, a tunneling conductive layer is disposed between adjacent cells. Therefore, the two adjacent batteries are electrically interconnected, the arrangement of an insulating layer is avoided, and the cost is reduced to the maximum extent.

Specifically, the tunneling conductive layer includes a doped microcrystalline silicon oxide layer, a doped microcrystalline silicon carbide layer, or a doped microcrystalline silicon carbide layer.

It is understood that an insulating layer may be disposed between a portion of two adjacent cells, and a tunneling conductive layer may be disposed between the remaining two adjacent cells.

It can be understood that, in the case where the tunneling conductive layer is provided between all the adjacent sub-cells, the double-sided tandem solar cell 10 is a two-terminal cell, and the number of the lead-out connection terminals is 2. Under the condition that the insulating layers are arranged between all the adjacent sub-batteries, the wiring terminals of each sub-battery can be reasonably connected in parallel and in series and then led out, so that various numbers of leading-out connecting ends are formed.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

Example two

In some alternative embodiments, the band gap of the first cell 11 is between 1eV and 2.5eV. Examples thereof include 1eV, 1.2eV, 1.5eV, 1.8eV, 2eV, 2.2eV and 2.5eV.

Therefore, the band gap of the first cell 11 is in a proper range, so that light with shorter wavelength can be absorbed conveniently, and light with longer wavelength can be absorbed by other cells with smaller band gaps after passing through the first cell 11, thereby avoiding poor overall photoelectric conversion efficiency caused by too small or too large band gaps.

Preferably, the band gap of the first cell 11 is 1.4eV to 1.6eV. Examples thereof include 1.4eV, 1.5eV, and 1.6eV. Thus, the overall photoelectric conversion efficiency is further improved.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

EXAMPLE III

In some alternative embodiments, the bandgap of the third cell 13 is in the range 1eV to 2.5eV. Examples thereof include 1eV, 1.2eV, 1.5eV, 1.8eV, 2eV, 2.2eV and 2.5eV.

Therefore, the band gap of the third cell 13 is in a proper range, so that light with shorter wavelength can be absorbed conveniently, and light with longer wavelength can be absorbed by other cells with smaller band gaps after passing through the third cell 13, thereby avoiding poor overall photoelectric conversion efficiency caused by too small or too large band gaps.

Preferably, the band gap of the third cell 13 is between 1.4eV and 1.6eV. For example, 1.4eV, 1.5eV, and 1.6eV. Thus, the overall photoelectric conversion efficiency is further improved.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

Example four

In some alternative embodiments, the band gap of the intermediate cell is between 0.7eV and 2eV.0.7eV, 0.75eV, 0.8eV, 0.9eV, 0.95eV, 1eV, 1.2eV, 1.5eV, 1.6eV, 1.7eV, 2eV.

Thus, the band gap of the middle cell is in a proper range, so that light with longer wavelength after passing through the first cell 11 and the third cell 13 can be absorbed conveniently, and poor overall photoelectric conversion efficiency caused by too small or too large band gap is avoided.

Specifically, in the case where the number of the second cells 12 is one, the second cell 12 is an intermediate cell, and the band gap may be a value in the range of 0.7eV to 2 eV; in the case where the number of the second cells 12 is plural, the band gap of the intermediate cell is 0.7eV to 2eV, the band gap of the second cell 12 between the intermediate cell and the first cell 11 is larger than the band gap of the intermediate cell and smaller than the band gap of the first cell 11, and the band gap of the second cell 12 between the intermediate cell and the third cell 13 is larger than the band gap of the intermediate cell and smaller than the band gap of the third cell 13.

For further explanation and explanation of the embodiment, reference may be made to other parts of the text, and in order to avoid redundancy, further description is omitted here.

EXAMPLE five

Referring to fig. 1, in some alternative embodiments, the number of the second batteries 12 is one, and the middle battery is the second battery 12.

In this way, the number of the sub-cells of the double-sided stacked solar cell 10 is three, and the band gap of each cell gradually increases from the middle second cell 12 to the outside, that is, the band gaps of the first cell 11 and the third cell 13 are both larger than the band gap of the second cell 12. Thus, efficient double-sided power generation can be realized, and the photoelectric conversion efficiency can be improved.

It is understood that the band gap of the first cell 11 may be larger than the band gap of the third cell 13, may be smaller than the band gap of the third cell 13, and may be equal to the band gap of the third cell 13. The relationship between the band gap of the first cell 11 and the band gap of the third cell 13 is not limited, and both of them may be larger than the band gap of the second cell 12.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

Example six

Referring to fig. 2, in some alternative embodiments, the number of the second cells 12 is a plurality and is odd, the number of the middle cells is one, and the middle cells are located in the middle of the plurality of second cells 12.

Thus, when the number of the second cells 12 is plural and odd, the cell located at the middle position of the plural second cells 12 is used as the middle cell, so that the band gap change from the middle cell can be more accurate, the power generation effect caused by the non-centered position of the middle cell is prevented from being poor, and the improvement of the photoelectric conversion efficiency is facilitated.

Specifically, in the example of fig. 2, the number of the second cells 12 is 3, which are the first sub cell 121, the second sub cell 122 and the third sub cell 123, respectively, and the second sub cell 122 is located in the middle of the 3 second cells 12, then, the middle cell is the second sub cell 122.

It is understood that in other examples, the number of second cells 12 may be 5, 7, 9, or other odd numbers.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

EXAMPLE seven

Referring to fig. 3, in some alternative embodiments, the number of the second batteries 12 is even, the number of the middle batteries is two, and the two middle batteries are respectively located at two sides of the middle position of the second batteries 12.

Thus, when the number of the second cells 12 is even and plural, the two cells located at both sides of the middle position of the plurality of second cells 12 are used as the middle cell, so that the band gap change from the middle cell can be more accurate, the power generation effect caused by the non-center position of the middle cell is prevented from being poor, and the photoelectric conversion efficiency is improved.

Specifically, in the example of fig. 3, the number of the second cells 12 is 2, which are the first sub cell 121 and the second sub cell 122, respectively, the middle position of the plurality of second cells 12 is between the first sub cell 121 and the second sub cell 122, and the first sub cell 121 and the second sub cell 122 are located on both sides of the middle position, so that both the first sub cell 121 and the second sub cell 122 are middle cells.

It is understood that the band gap of each cell gradually increases in a direction from the intermediate cell close to the first cell 11; the band gap of each cell gradually increases in a direction from the middle cell close to the third cell 13.

Specifically, in the example of fig. 3, the band gap of each cell gradually increases in the direction from the first subcell 121 to the first cell 11; the band gap of each cell gradually increases in the direction from the second subcell 122 to the third cell 13.

It is understood that in other examples, the number of second batteries 12 may be 4, 6, 8, or other even numbers.

For further explanation and explanation of the embodiment, reference may be made to other parts of the text, and in order to avoid redundancy, further description is omitted here.

Example eight

In some alternative embodiments, the bandgaps of the two intermediate cells are the same. In this way, the absorption capacity of the two intermediate cells for sunlight is made the same.

It will be appreciated that in alternative embodiments, the band gaps of the two intermediate cells may also be different.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

Example nine

The battery module according to the embodiment of the present application includes the bifacial tandem solar cell 10 according to any one of the embodiments one to eight.

According to the battery component provided by the embodiment of the application, the band gaps of the batteries are gradually increased from the middle to the outside, so that efficient double-sided power generation can be realized, and the improvement of the photoelectric conversion efficiency is facilitated.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

Example ten

The photovoltaic system provided by the present application includes the cell assembly of embodiment nine.

According to the photovoltaic system provided by the embodiment of the application, the band gaps of the cells are gradually increased from the middle to the outside, so that efficient double-sided power generation can be realized, and the improvement of the photoelectric conversion efficiency is facilitated.

In this embodiment, the photovoltaic system can be applied to photovoltaic power stations, such as ground power stations, roof power stations, water surface power stations, etc., and can also be applied to devices or apparatuses that generate electricity by using solar energy, such as user solar power sources, solar street lamps, solar cars, solar buildings, etc. Of course, it is understood that the application scenario of the photovoltaic system is not limited thereto, that is, the photovoltaic system can be applied in all fields requiring solar energy for power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box and an inverter, the photovoltaic array may be an array combination of a plurality of battery modules, for example, the plurality of battery modules may constitute a plurality of photovoltaic arrays, the photovoltaic array is connected to the combiner box, the combiner box may combine currents generated by the photovoltaic array, and the combined currents are converted into alternating currents required by a utility grid through the inverter and then are connected to the utility grid to realize solar power supply.

For further explanation and explanation of this embodiment, reference may be made to other parts of the present document, and further explanation is omitted here to avoid redundancy.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. Furthermore, the particular features, structures, materials, or characteristics described in connection with the embodiments or examples disclosed herein may be combined in any suitable manner in any one or more of the embodiments or examples.

Claims (10)

1. A double-sided laminated solar cell is characterized by comprising a first cell, a second cell and a third cell which are sequentially laminated, wherein the second cell comprises an intermediate cell, and the band gap of each cell is gradually increased along the direction from the intermediate cell to the first cell; the band gap of each cell gradually increases in a direction from the intermediate cell to the third cell.

2. The bifacial tandem solar cell of claim 1, wherein said first cell has a band gap in the range of 1eV to 2.5eV.

3. The bifacial tandem solar cell of claim 1, wherein said third cell has a band gap in the range of 1eV to 2.5eV.

4. The bifacial tandem solar cell according to claim 1, wherein said intermediate cell has a band gap of 0.7eV-2eV.

5. The bifacial tandem solar cell of claim 1 wherein said second cell is one in number and said intermediate cell is said second cell.

6. The bifacial tandem solar cell of claim 1 wherein said second cells are plural and odd in number, said intermediate cells are one in number, and said intermediate cells are located at intermediate positions of said plurality of second cells.

7. The tandem double-sided solar cell according to claim 1, wherein the number of the second cells is even and plural, and the number of the intermediate cells is two, and two of the intermediate cells are respectively located at both sides of the intermediate position of the plural second cells.

8. The bifacial tandem solar cell of claim 7, wherein the band gaps of both said intermediate cells are the same; alternatively, the bandgaps of the two intermediate cells are different.

9. A battery module comprising the double-sided tandem solar cell according to any one of claims 1 to 8.

10. A photovoltaic system comprising the cell assembly of claim 9.

Images