Straight-line-shaped series-connection three-terminal type laminated solar cell module
By connecting two tandem solar cells A and B with opposite polarities in a straight line, the problems of high stress and excessive gaps in the connecting ribbons of three-terminal tandem solar cell modules are solved, thereby improving product yield and efficiency.
Patent Information
- Application Number
- CN202520265539.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-19
AI Technical Summary
The existing connection method of three-terminal tandem solar cell modules increases the edge stress of the cells, leading to fragmentation. In addition, the gaps between the cells are too large, which cannot maximize the utilization of the effective area and affects the cell efficiency.
By using a linear series connection method, two stacked cells A and B with opposite polarities are connected in series in a specific way, which reduces the stress caused by the interaction between the connecting solder strip and the edge of the silicon wafer and improves the product yield.
This significantly reduces stress issues caused by the interaction between the connecting solder strip and the edge of the silicon wafer, improving product yield and increasing the effective area utilization of the battery module.
Smart Images
Figure CN223600274U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of solar cell, especially to a one -dimensional series connection's three -terminal laminated solar cell module. BACKGROUND
[0002] In the photovoltaic field, compared with single-junction solar cells, laminated solar cells can better utilize different wavelengths of the solar spectrum, have lower absorption loss and heat loss, and thus can improve the utilization rate of photons and the conversion efficiency of the cells.
[0003] The current common laminated solar cell structure is a two-terminal structure of HJT cell stacked perovskite cell (as shown in Figure 3 ), and the cell module is connected in an upper and lower alternating "Z" shape connection mode. Figure 4 For example, as shown in , the positive hole transport layer (or electron transport layer) of the perovskite cell is connected to the n region (or p region) of the adjacent HJT cell through a solder strip ("Z" shape welding) to achieve series connection.
[0004] In order to further improve the efficiency of laminated cells, using a more efficient bottom cell has become an effective way. Since the BC cell moves all the front grid lines to the back, it can maximize the use of sunlight, and the corresponding cell efficiency is at the highest level among single-junction crystalline silicon cells. However, due to the staggered arrangement of the positive and negative grid lines on the back of the BC cell, the BC cell stacked with perovskite cells forms a special three-terminal structure cell (two positive poles + one negative pole or two negative poles + one positive pole). The current common connection method for three-terminal laminated structure cells at the module end is to first combine the upper and lower positive poles or negative poles into one positive pole or negative pole (three-terminal structure changes to two-terminal structure), and then perform the conventional module "Z" shape series / parallel connection. However, this method not only increases the complexity of the connection, but also uses the traditional upper and lower "Z" shape welding between cells, which on the one hand increases the stress on the edges of the cells and increases the generation of broken pieces, and on the other hand the gap between the cells is too large, the effective area of the module panel cannot be maximized, and the power cannot be further improved. INVENTION CONTENTS
[0005] To solve the above technical problems, the utility model provides a one -dimensional series connection's three -terminal laminated solar cell module. The utility model cell module includes two kinds of opposite polarity laminated cells, and the two kinds of laminated cells are connected by one -dimensional series connection. Compared with the conventional upper and lower alternating Z shape series connection, the connection method of the utility model can significantly reduce the problem of large stress caused by the upper and lower alternating connection of the connection solder strip and the edges of the silicon wafer, thereby improving the product yield.
[0006] The utility model discloses a specific technical scheme for a one-letter-shaped series connection three-terminal laminated solar cell module, which comprises staggered series connection laminated cell A and laminated cell B.
[0007] The connection mode between the laminated cell A and the laminated cell B is that the positive pole on the front face of each laminated cell A is connected with the negative pole on the front face of the previous adjacent laminated cell B, and the positive pole and the negative pole on the back face of each laminated cell A are respectively connected with the negative pole and the positive pole on the back face of the next adjacent laminated cell B.
[0008] Specifically,
[0009] The laminated cell A comprises, from the front face to the back face, a hole transport layer, a perovskite layer, an electron transport layer, an interconnection layer and a silicon substrate which are sequentially laminated; the back face of the silicon substrate is provided with an isolated boron diffusion layer and a phosphorus diffusion layer; the front face of the hole transport layer, the back face of the boron diffusion layer and the back face of the phosphorus diffusion layer are respectively provided with a positive pole and a negative pole.
[0010] The laminated cell B comprises, from the front face to the back face, an electron transport layer, a perovskite layer, a hole transport layer, an interconnection layer and a silicon substrate which are sequentially laminated; the back face of the silicon substrate is provided with an isolated boron diffusion layer and a phosphorus diffusion layer; the front face of the electron transport layer and the back face of the phosphorus diffusion layer are respectively provided with a negative pole; and the back face of the boron diffusion layer is provided with a positive pole.
[0011] In order to realize that the connecting wires between the adjacent laminated cells do not penetrate the gap between the adjacent laminated cells, the utility model designs two kinds of laminated cells with opposite polarities as units. The structure of the laminated cell A is that the front face is the hole transport layer (positive pole base) of the perovskite cell, one side of the bottom BC cell is the boron diffusion layer (positive pole base), and the other side is the phosphorus diffusion layer (negative pole base); the structure of the laminated cell B is that the front face is the electron transport layer (negative pole base) of the perovskite cell, one side of the bottom BC cell is the boron diffusion layer (positive pole base), and the other side is the phosphorus diffusion layer (negative pole base), and the positions of the boron diffusion layer and the phosphorus diffusion layer are opposite to those of the laminated cell A.
[0012] The two kinds of laminated cells are connected in series according to the specific mode of the utility model, so that the overall connection mode of the battery assembly is changed from the conventional Z-shaped series connection with the upper and lower alternation to the one-letter-shaped series connection, the problem of relatively large stress caused by the upper and lower alternation of the connecting solder strips and the edges of the silicon wafer is reduced, and the product yield is improved.
[0013] As a preferred, the positions of the boron diffusion layer and the phosphorus diffusion layer on the back face of the silicon substrate in the laminated cell A and the laminated cell B are opposite.
[0014] As preferred, the hole transport layer is a 2,2',7,7'-tetrakis(N,N-diphenylamine) spirofluorene hole transport layer, a poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] hole transport layer, a nickel oxide hole transport layer, a cuprous iodide hole transport layer, or a cupric thiocyanate hole transport layer, etc.
[0015] As preferred, the electron transport layer is a [6,6]-phenyl-C61-butyric acid methyl ester electron transport layer, a titanium dioxide electron transport layer, a zinc oxide electron transport layer, or a tin dioxide electron transport layer, etc.
[0016] As preferred, the interconnection layer is a TCO interconnection layer, a p-n tunnel junction interconnection layer, or a metal interconnection layer, etc.
[0017] As preferred, the stack cell A and the stack cell B are connected by a solder strip.
[0018] Compared with the prior art, the battery assembly of the utility model has the beneficial effects that: the battery assembly of the utility model includes two kinds of stack cells with opposite polarities, and the two kinds of stack cells are connected in series in a straight line, the connection mode of the utility model can significantly reduce the problem of large stress caused by the up-and-down alternation of the connection solder strip and the edge of the silicon wafer compared with the conventional Z-shaped series connection mode of up-and-down alternation, and the product yield is improved. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a connection mode schematic diagram of a three-terminal stack battery assembly of the utility model.
[0020] Figure 2 It is a structure schematic diagram of a stack cell A (a) and a stack cell B (b) in the three-terminal stack battery assembly of the utility model.
[0021] Figure 3 It is a structure schematic diagram of a conventional two-terminal stack battery.
[0022] Figure 4 It is a connection mode schematic diagram of a conventional two-terminal stack battery assembly.
[0023] The figure mark is: positive electrode 1, hole transport layer 2, perovskite layer 3, electron transport layer 4, interconnection layer 5, boron diffusion layer 6, phosphorus diffusion layer 7, negative electrode 8, solder strip 9, and silicon substrate 10. DETAILED DESCRIPTION
[0024] The utility model will be further described below in combination with examples.
[0025] OVERALL EXAMPLE
[0026] A three-terminal stack solar cell assembly connected in a straight line includes stack cells A and stack cells B connected in series in an interlaced manner.
[0027] In particular,
[0028] The laminated battery A comprises, from the front to the back, a hole transport layer, a perovskite layer, an electron transport layer, an interconnection layer and a silicon substrate which are sequentially stacked; the back of the silicon substrate is provided with an isolated boron diffusion layer and a phosphorus diffusion layer (i.e. an insulating isolation region is provided between the boron diffusion layer and the phosphorus diffusion layer); the front of the hole transport layer and the back of the boron diffusion layer are each provided with a positive electrode; and the back of the phosphorus diffusion layer is provided with a negative electrode.
[0029] The laminated battery B comprises, from the front to the back, an electron transport layer, a perovskite layer, a hole transport layer, an interconnection layer and a silicon substrate which are sequentially stacked; the back of the silicon substrate is provided with an isolated boron diffusion layer and a phosphorus diffusion layer (i.e. an insulating isolation region is provided between the boron diffusion layer and the phosphorus diffusion layer); the front of the electron transport layer and the back of the phosphorus diffusion layer are each provided with a negative electrode; and the back of the boron diffusion layer is provided with a positive electrode.
[0030] In the laminated battery A and the laminated battery B, the positions of the boron diffusion layer and the phosphorus diffusion layer on the back of the silicon substrate are opposite (i.e. the positions of the positive electrode and the negative electrode on the back of the battery are opposite).
[0031] In some preferred embodiments, the hole transport layer is a 2,2',7,7'-tetrakis(N,N-di-p-toluidine) spirofluorene hole transport layer, a poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] hole transport layer, a nickel oxide hole transport layer, a cuprous iodide hole transport layer or a cupric thiocyanate hole transport layer, etc.
[0032] In some preferred embodiments, the electron transport layer is a [6,6]-phenyl-C61-butyric acid methyl ester electron transport layer, a titanium dioxide electron transport layer, a zinc oxide electron transport layer or a tin dioxide electron transport layer, etc.
[0033] In some preferred embodiments, the interconnection layer is a TCO interconnection layer, a p-n tunnel junction interconnection layer or a metal interconnection layer, etc.
[0034] In some preferred embodiments, the laminated battery A and the laminated battery B are connected by a solder strip.
[0035] The connection mode between the laminated battery A and the laminated battery B is that one positive electrode on the front of each laminated battery A is connected to one negative electrode on the front of the adjacent laminated battery B in front; and one positive electrode and one negative electrode on the back of each laminated battery A are respectively connected to one negative electrode and one positive electrode on the back of the adjacent laminated battery B behind. Specific embodiments
[0037] Example 1
[0038] A one-dimensional series connection three-terminal laminated solar cell module, as shown in Figure 1 includes interlaced series connection of laminated cell A (a total of 36 pieces) and laminated cell B (a total of 36 pieces). Specifically:
[0039] As shown in (a) in Figure 2 , the laminated cell A includes, from front to back, a hole transport layer 2 (the material of the hole transport layer is nickel oxide), a perovskite layer 3, an electron transport layer 4 (the material of the electron transport layer is titanium dioxide), an interconnection layer 5 (the material of the interconnection layer is ITO) and a silicon substrate 10, which are sequentially laminated; the back of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (that is, an insulating isolation area is provided between the boron diffusion layer and the phosphorus diffusion layer) ; the front of the hole transport layer and the back of the boron diffusion layer are each provided with a positive electrode 1, and the back of the phosphorus diffusion layer is provided with a negative electrode 8.
[0040] As shown in (b) in Figure 2 , the laminated cell B includes, from front to back, an electron transport layer 4 (the material of the electron transport layer is titanium dioxide), a perovskite layer 3, a hole transport layer 2 (the material of the hole transport layer is nickel oxide), an interconnection layer 5 (the material of the interconnection layer is ITO) and a silicon substrate 10, which are sequentially laminated; the back of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (that is, an insulating isolation area is provided between the boron diffusion layer and the phosphorus diffusion layer) ; the front of the electron transport layer and the back of the phosphorus diffusion layer are each provided with a negative electrode 8; the back of the boron diffusion layer is provided with a positive electrode 1.
[0041] In the above-mentioned laminated cell A and laminated cell B, the positions of the boron diffusion layer and the phosphorus diffusion layer on the back of the silicon substrate in the laminated cell A and the laminated cell B are opposite (that is, the positions of the positive electrode and the negative electrode on the back of the cell are opposite). As shown in Figure 1 , the connection mode between the above-mentioned laminated cell A and laminated cell B is that one positive electrode on the front of each laminated cell A is connected to one negative electrode on the front of the adjacent laminated cell B in front through a solder strip 9; one positive electrode and one negative electrode on the back of each laminated cell A are connected to one negative electrode and one positive electrode on the back of the adjacent laminated cell B in back through a solder strip 9, respectively.
[0042] In order to realize that the connecting line between the adjacent stacked batteries does not penetrate the gap between the adjacent stacked batteries, the utility model scheme designs two kinds of stacked batteries (stacked battery A and stacked battery B) with opposite polarity as units. Among them, the structure of stacked battery A is: the positive hole transport layer (positive electrode base) of perovskite battery on the front side, the boron diffusion layer (positive electrode base) on one side of the bottom BC battery, and the phosphorus diffusion layer (negative electrode base) on the other side; The structure of stacked battery A is: the electron transport layer (negative electrode base) of perovskite battery on the front side, the boron diffusion layer (positive electrode base) on one side of the bottom BC battery, and the phosphorus diffusion layer (negative electrode base) on the other side, and the positions of the boron diffusion layer and the phosphorus diffusion layer are opposite to those of stacked battery A. The above two kinds of stacked batteries are connected in series according to the specific way of the utility model, so that the overall connection mode of the battery assembly is changed from the conventional Z-shaped series connection of up and down alternation to the straight-line series connection, the problem of large stress caused by the up and down alternation of the connecting solder strip and the edge of the silicon wafer is reduced, and the product yield is improved.
[0043] Example 2
[0044] A straight-line series connection three-terminal stacked solar cell assembly includes stacked battery A (a total of 27 pieces) and stacked battery B (a total of 27 pieces) connected in series. Specifically:
[0045] The stacked battery A includes, from front to back, a positive hole transport layer 2 (the material of the positive hole transport layer is 2,2',7,7'-tetra (N,N-dipara-toluidine) spirofluorene), a perovskite layer 3, an electron transport layer 4 (the material of the electron transport layer is [6,6]-phenyl-C61-butyric acid methyl ester), an interconnection layer 5 (the material of the interconnection layer is a p-n tunnel junction), and a silicon substrate 10; the back of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (i.e. an insulating isolation area is provided between the boron diffusion layer and the phosphorus diffusion layer); the positive hole transport layer front and the back of the boron diffusion layer are each provided with a positive electrode 1, and the back of the phosphorus diffusion layer is provided with a negative electrode 8.
[0046] The stacked battery B includes, from front to back, an electron transport layer 4 (the material of the electron transport layer is [6,6]-phenyl-C61-butyric acid methyl ester), a perovskite layer 3, a positive hole transport layer 2 (the material of the positive hole transport layer is 2,2',7,7'-tetra (N,N-dipara-toluidine) spirofluorene), an interconnection layer 5 (the material of the interconnection layer is a p-n tunnel junction), and a silicon substrate 10; the back of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (i.e. an insulating isolation area is provided between the boron diffusion layer and the phosphorus diffusion layer); the front of the electron transport layer and the back of the phosphorus diffusion layer are each provided with a negative electrode 8; the back of the boron diffusion layer is provided with a positive electrode 1.
[0047] In the above-mentioned stacked cell A and stacked cell B, the positions of the boron diffusion layer and the phosphorus diffusion layer on the back surface of the silicon substrate are opposite (i.e., the positions of the positive electrode and the negative electrode on the back surface of the cell are opposite). The connection mode between the above-mentioned stacked cell A and stacked cell B is that one positive electrode on the front surface of each stacked cell A is connected to one negative electrode on the front surface of the adjacent stacked cell B in front by a solder ribbon; one positive electrode and one negative electrode on the back surface of each stacked cell A are respectively connected to one negative electrode and one positive electrode on the back surface of the adjacent stacked cell B behind by a solder ribbon.
[0048] Example 3
[0049] A linear series of three-terminal stacked solar cell modules, which includes stacked cell A (a total of 39 pieces) and stacked cell B (a total of 39 pieces) in staggered series. Specifically:
[0050] The stacked cell A includes, from the front surface to the back surface, a hole transport layer 2 (the material of the hole transport layer is cuprous iodide), a perovskite layer 3, an electron transport layer 4 (the material of the electron transport layer is zinc oxide), an interconnection layer 5 (the material of the interconnection layer is metal), and a silicon substrate 10, which are sequentially stacked; the back surface of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (i.e., an insulating isolation area is provided between the boron diffusion layer and the phosphorus diffusion layer); the front surface of the hole transport layer and the back surface of the boron diffusion layer are each provided with one positive electrode 1, and the back surface of the phosphorus diffusion layer is provided with one negative electrode 8.
[0051] The stacked cell B includes, from the front surface to the back surface, an electron transport layer 4 (the material of the electron transport layer is zinc oxide), a perovskite layer 3, a hole transport layer 2 (the material of the hole transport layer is cuprous iodide), an interconnection layer 5 (the material of the interconnection layer is metal), and a silicon substrate 10, which are sequentially stacked; the back surface of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (i.e., an insulating isolation area is provided between the boron diffusion layer and the phosphorus diffusion layer); the front surface of the electron transport layer and the back surface of the phosphorus diffusion layer are each provided with one negative electrode 8; and the back surface of the boron diffusion layer is provided with one positive electrode 1.
[0052] In the above-mentioned stacked cell A and stacked cell B, the positions of the boron diffusion layer and the phosphorus diffusion layer on the back surface of the silicon substrate are opposite (i.e., the positions of the positive electrode and the negative electrode on the back surface of the cell are opposite). The connection mode between the above-mentioned stacked cell A and stacked cell B is that one positive electrode on the front surface of each stacked cell A is connected to one negative electrode on the front surface of the adjacent stacked cell B in front by a solder ribbon; one positive electrode and one negative electrode on the back surface of each stacked cell A are respectively connected to one negative electrode and one positive electrode on the back surface of the adjacent stacked cell B behind by a solder ribbon.
[0053] Example 4
[0054] A linear series of three-terminal laminated solar cell module, which comprises interlaced series of laminated cell A (total 39 pieces) and laminated cell B (total 39 pieces).
[0055] The laminated cell A comprises, from the front side to the back side, a hole transport layer 2 (the material of the hole transport layer is copper thiocyanate), a perovskite layer 3, an electron transport layer 4 (the material of the electron transport layer is tin dioxide), an interconnection layer 5 (the material of the interconnection layer is ITO) and a silicon substrate 10, which are sequentially laminated; the back side of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (namely, an insulating isolation area is arranged between the boron diffusion layer and the phosphorus diffusion layer); the front side of the hole transport layer and the back side of the boron diffusion layer are each provided with a positive electrode 1, and the back side of the phosphorus diffusion layer is provided with a negative electrode 8.
[0056] The laminated cell B comprises, from the front side to the back side, an electron transport layer 4 (the material of the electron transport layer is tin dioxide), a perovskite layer 3, a hole transport layer 2 (the material of the hole transport layer is copper thiocyanate), an interconnection layer 5 (the material of the interconnection layer is ITO) and a silicon substrate 10, which are sequentially laminated; the back side of the silicon substrate is provided with an isolated boron diffusion layer 6 and a phosphorus diffusion layer 7 (namely, an insulating isolation area is arranged between the boron diffusion layer and the phosphorus diffusion layer); the front side of the electron transport layer and the back side of the phosphorus diffusion layer are each provided with a negative electrode 8; and the back side of the boron diffusion layer is provided with a positive electrode 1.
[0057] In the laminated cell A and the laminated cell B, the positions of the boron diffusion layer and the phosphorus diffusion layer on the back side of the silicon substrate are opposite (namely, the positions of the positive electrode and the negative electrode on the back side of the cell are opposite).
[0058] The raw materials and the equipment used in the utility model, if no special description, are the commonly used raw materials and equipment in the field; the method used in the utility model, if no special description, is the conventional method in the field.
[0059] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any simple modification, change and equivalent transformation according to the technical essence of the utility model are still within the protection scope of the technical scheme of the utility model.
Claims
1. A monolithic series-connected three-terminal tandem solar cell module, characterized by: The stack cell A and the stack cell B are connected in series alternately. The front surface of the stack cell A is provided with a positive electrode, and the back surface is provided with a positive electrode and a negative electrode. The front surface of the stack cell B is provided with a negative electrode, and the back surface is provided with a positive electrode and a negative electrode. The positive electrode and the negative electrode on the back surface of the two stack cells are opposite in position. The positive electrode on the front surface of each stack cell A is connected with the negative electrode on the front surface of the adjacent stack cell B in front. The positive electrode and the negative electrode on the back surface of each stack cell A are connected with the negative electrode and the positive electrode on the back surface of the adjacent stack cell B in back, respectively.
2. The three-terminal stacked solar cell module according to claim 1, characterized by: The stack cell A comprises, from the front surface to the back surface, a hole transport layer, a perovskite layer, an electron transport layer, an interconnection layer and a silicon substrate, which is provided with an isolated boron diffusion layer and a phosphorus diffusion layer on the back surface; the front surface of the hole transport layer and the back surface of the boron diffusion layer are provided with a positive electrode, and the back surface of the phosphorus diffusion layer is provided with a negative electrode.
3. The three-terminal stacked solar cell module according to claim 2, wherein: The stack cell B comprises, from the front surface to the back surface, an electron transport layer, a perovskite layer, a hole transport layer, an interconnection layer and a silicon substrate, which is provided with an isolated boron diffusion layer and a phosphorus diffusion layer on the back surface; the front surface of the electron transport layer and the back surface of the phosphorus diffusion layer are provided with a negative electrode, and the back surface of the boron diffusion layer is provided with a positive electrode.
4. The three-terminal stacked solar cell module according to claim 3, wherein: The positions of the boron diffusion layer and the phosphorus diffusion layer on the back surface of the silicon substrate in the stack cell A and the stack cell B are opposite.
5. The three-terminal stacked solar cell module according to claim 2 or 3, characterized by: The hole transport layer is a 2,2',7,7'-tetra(N,N-di-p-toluidine) spirofluorene hole transport layer, a poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] hole transport layer, a nickel oxide hole transport layer, a cuprous iodide hole transport layer or a cupric thiocyanate hole transport layer.
6. The three-terminal stacked solar cell module according to claim 2 or 3, wherein: The electron transport layer is a [6,6]-phenyl-C61-butyric acid methyl ester electron transport layer, a titanium dioxide electron transport layer, a zinc oxide electron transport layer or a tin dioxide electron transport layer.
7. The three-terminal stacked solar cell module according to claim 2 or 3, wherein: The interconnection layer is a TCO interconnection layer, a p-n tunnel junction interconnection layer or a metal interconnection layer.
8. The three-terminal stacked solar cell module of claim 1, wherein: The stack cell A and the stack cell B are connected through a solder strip.