Stacked battery assembly

Abstract

The utility model discloses a kind of laminated battery assemblies, laminated battery assembly includes crystalline silicon cell layer and perovskite battery layer, crystalline silicon cell layer and perovskite battery layer are stacked along the thickness direction of laminated battery group, and intermediate adhesive film is provided between crystalline silicon cell layer and perovskite battery layer, crystalline silicon cell layer includes multiple series connection crystalline silicon cells, perovskite battery layer includes multiple series connection perovskite cells, laminated battery assembly further includes positive total busbar, negative total busbar and crystalline silicon cell flow bar, the positive pole and negative pole of adjacent perovskite cell are sequentially connected, the both ends of crystalline silicon cell flow bar are connected with the positive pole and negative pole of adjacent crystalline silicon cell respectively;Multiple perovskite cell series connection negative pole and multiple crystalline silicon cell series connection negative pole are connected in parallel, and are electrically connected with negative total busbar, multiple crystalline silicon cell series connection positive pole and multiple perovskite cell series connection light-transmitting positive pole are connected in parallel, and are electrically connected with positive total busbar.The utility model uses less material, and production cost is low.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, specifically to a tandem battery module. Background Technology

[0002] Perovskite materials possess excellent photoelectric properties, enabling them to provide high energy conversion efficiency in photovoltaic tandem cells. When stacked with other photovoltaic materials, perovskite cells can absorb a wider spectral range, further increasing photoelectric conversion efficiency. They are commonly used in four-terminal tandem cells, where the perovskite layer is typically located at the top or middle, optimizing overall performance.

[0003] To achieve higher module power generation, a series-connected top-cell perovskite module and a series-connected bottom-cell crystalline silicon module are connected in parallel for output. However, the existing series connection method for perovskite modules has problems such as space occupation and low conductivity efficiency. Utility Model Content

[0004] This invention aims to address one of the technical problems in related technologies to a certain extent. Therefore, this invention provides a stacked battery module, which has the advantages of using less material and having low production costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A stacked solar cell assembly includes a crystalline silicon cell layer and a perovskite cell layer, which are stacked along the thickness direction of the assembly. An interlayer film is provided between the crystalline silicon cell layer and the perovskite cell layer. Each crystalline silicon cell layer includes multiple crystalline silicon cells connected in series, and each perovskite cell layer includes multiple perovskite cells connected in series. The stacked solar cell assembly also includes a positive electrode busbar, a negative electrode busbar, and a crystalline silicon cell guide bar. The positive and negative electrodes of adjacent perovskite cells are connected sequentially. The two ends of the crystalline silicon cell guide bar are respectively connected to the positive and negative electrodes of adjacent crystalline silicon cells. The negative electrode of the multiple perovskite cells connected in series is connected in parallel with the negative electrode of the multiple crystalline silicon cells connected in series and is electrically connected to the negative electrode busbar. The positive electrode of the multiple crystalline silicon cells connected in series is connected in parallel with the light-transmitting positive electrode of the multiple perovskite cells connected in series and is electrically connected to the positive electrode busbar.

[0006] By using positive and negative busbars to connect the positive and negative electrodes of the perovskite and crystalline silicon solar cell layers in parallel, the problem of requiring separate junction boxes for each layer is avoided, simplifying the connection and reducing production costs.

[0007] Optionally, a first gap is formed between the plurality of said perovskite cells, the metal negative electrode of said perovskite cell extends into the first gap, and the portion of said metal negative electrode located in the first gap contacts the adjacent perovskite cell and is used for electrical connection of the adjacent perovskite cells.

[0008] The perovskite cells are separated by a first gap to avoid parallel connection between them. The perovskite cells are connected in series by sequentially connecting the metal anode and the light-transmitting cathode of the perovskite cells, forming a larger perovskite cell layer.

[0009] Optionally, the first end of the metal negative electrode of the perovskite cell passes through the first interval and is electrically connected to the light-transmitting positive electrode of the adjacent previous perovskite cell, and the second end of the metal negative electrode of the perovskite cell is located inside the perovskite cell.

[0010] The metal anode of the perovskite solar cell is used to connect perovskite solar cells in series. The transparent positive electrode of the previous perovskite solar cell is electrically connected to the metal anode of the next perovskite solar cell. The perovskite solar cells within the perovskite solar cell layer are electrically connected in sequence to realize the series connection between perovskite solar cells.

[0011] Optionally, the metal negative electrode of the perovskite solar cell is disposed on the intermediate film, and the light-transmitting positive electrode of the perovskite solar cell is located away from the intermediate film relative to the negative electrode of the perovskite solar cell; the light-transmitting positive electrode of the perovskite solar cell passes through the perovskite solar cell and is electrically connected to the metal negative electrode of the adjacent subsequent perovskite solar cell.

[0012] The negative electrode of the perovskite solar cell layer is fixed on the intermediate adhesive film, which provides a fixing point for the perovskite solar cell layer and improves the stability of the perovskite solar cell layer.

[0013] Optionally, a second spacer is formed between the metal anodes of two adjacent perovskite cells, the second spacer being located inside a single perovskite cell.

[0014] A second gap is used between the metal negative electrodes of two adjacent perovskite cells to prevent electrical connections between multiple perovskite cells.

[0015] Optionally, a carrier transport layer is formed within the perovskite solar cell, and a first channel is formed within the carrier transport layer. The first channel penetrates the carrier transport layer in the thickness direction, and the light-transmitting positive electrode of the perovskite solar cell is electrically connected to the metal negative electrode of the adjacent subsequent perovskite solar cell through the first channel.

[0016] The first channel within the carrier transport layer is used to connect the metal anode and the light-transmitting cathode of the perovskite cell, preventing electrical connection between the two metal anodes of adjacent perovskite cells and improving the stability of the tandem cell assembly.

[0017] Optionally, the number of perovskite solar cells in the perovskite solar cell layer is greater than or equal to 80 and less than or equal to 120, and the size of the perovskite solar cell layer is greater than or equal to 1m*2m.

[0018] A large-area perovskite solar cell is divided into 100 sub-cells using laser scribing. Each sub-cell has an open-circuit voltage of 1.0V, resulting in a total open-circuit voltage of 100V for the large-area perovskite solar cell. The total voltage of the 100 perovskite cells connected in series is similar to that of a crystalline silicon solar cell layer.

[0019] Optionally, the crystalline silicon solar cell layer includes multiple solar cells of the same specifications, with the number of solar cells being greater than or equal to 120 and less than or equal to 150. The solar cells are connected in series to form 6 solar cell strings, and each solar cell string is connected in series with the other solar cells by a crystalline silicon solar cell current guide strip. Each solar cell string includes the same number of solar cells.

[0020] The crystalline silicon solar cells use 166mm*83mm cells connected in series, with a total of 6 strings of 22 cells per string, for a total of 132 166mm*83mm cells. Each cell has an open-circuit voltage of 0.750V, and the total open-circuit voltage of the crystalline silicon cell strings is 99V. The total voltage of the series-connected crystalline silicon cells is similar to that of the perovskite cells, thus meeting the requirements for parallel connection.

[0021] Optionally, the stacked battery assembly further includes a junction box, through which the positive and negative main busbars are connected.

[0022] The total positive and negative terminals of the perovskite and crystalline silicon solar cell layers connected in parallel are connected to a junction box. Since the positive and negative busbars are connected first, only one junction box is needed, and only one inverter is needed at the corresponding power station end, which reduces production costs.

[0023] Optionally, the stacked battery assembly further includes a frame that surrounds and seals the perovskite battery layer and the crystalline silicon battery layer.

[0024] The frame is used to seal the tandem battery module and improve its stability.

[0025] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and groups appearing in the following text and drawings has multiple components, and different symbols or numbers are used for convenience of representation, but all represent components with the same or similar structure or function. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the connection of a stacked battery assembly according to the present invention.

[0027] Figure 2 This is a structural diagram of a stacked battery assembly according to the present invention.

[0028] Figure 3 This is an assembly diagram of a stacked battery module according to the present invention.

[0029] Explanation of reference numerals in the attached figures: 1. Crystalline silicon cell; 2. Perovskite cell; 21. Transparent positive electrode; 22. Metallic negative electrode; 23. Second spacer; 24. Carrier transport layer; 241. First channel; 3. Intermediate film; 4. Positive electrode busbar; 5. Negative electrode busbar; 6. Frame; 7. Crystalline silicon cell current guide bar; 8. Junction box; 9. Upper encapsulation layer; 10. Lower encapsulation layer. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar meta-layers or meta-layers with the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0031] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0032] Currently, four-terminal stacked batteries are mechanically stacked two sub-cells. The mechanically stacked four-terminal stacked structure requires two sets of packaging materials, which increases material costs. In addition, the mechanically stacked four-terminal stacked battery is equivalent to having two positive and negative terminals, requiring two junction boxes. The power station requires two separate inverters, which presents a matching problem with existing power stations.

[0033] like Figures 1-3As shown, this application proposes a stacked battery module, which includes a crystalline silicon battery layer and a perovskite battery layer. The crystalline silicon battery layer and the perovskite battery layer are stacked along the thickness direction of the stacked battery module, and an interlayer film 3 is disposed between the crystalline silicon battery layer and the perovskite battery layer. The crystalline silicon battery layer includes a plurality of crystalline silicon cells 1 connected in series, and the perovskite battery layer includes a plurality of perovskite cells 2 connected in series. The stacked battery module also includes a positive electrode busbar 4. The negative electrode busbar 5 and the crystalline silicon cell guide bar 7 are connected in sequence. The positive and negative electrodes of adjacent perovskite cells 2 are connected in sequence. The two ends of the crystalline silicon cell guide bar 7 are respectively connected to the positive and negative electrodes of adjacent crystalline silicon cells 1. The negative electrode of multiple perovskite cells 2 connected in series is connected in parallel with the negative electrode of multiple crystalline silicon cells 1 connected in series and is electrically connected to the negative electrode busbar 5. The positive electrode of multiple crystalline silicon cells 1 connected in series is connected in parallel with the light-transmitting positive electrode 21 of multiple perovskite cells 2 connected in series and is electrically connected to the positive electrode busbar 4.

[0034] By using the positive busbar 4 and the negative busbar 5 to connect the positive and negative electrodes of the perovskite cell layer and the crystalline silicon cell layer in parallel, the problem of each perovskite cell layer and the crystalline silicon cell layer needing a separate junction box 8 is avoided, simplifying the connection and reducing production costs.

[0035] A first interval 22 is formed between the plurality of the perovskite cells 2, the metal negative electrode 22 of the perovskite cell 2 extends into the first interval 22, and the portion of the metal negative electrode 22 located in the first interval contacts the adjacent perovskite cell 2 and is used for electrical connection of the adjacent perovskite cell 2.

[0036] The perovskite cells 2 are separated by a first interval 22 to avoid parallel connection between them. The perovskite cells 2 are connected in series by the sequential electrical connection of the metal anode 22 and the light-transmitting cathode 21 of the perovskite cells, forming a larger perovskite cell layer.

[0037] The first end of the metal negative electrode 22 of the perovskite cell 2 passes through the first interval 22 and is electrically connected to the light-transmitting positive electrode 21 of the adjacent previous perovskite cell 2. The second end of the metal negative electrode 22 of the perovskite cell 2 is located inside the perovskite cell 2.

[0038] The metal anode 22 of the perovskite solar cell 2 is used to connect the perovskite solar cells 2 in series. The light-transmitting positive electrode 21 of the previous perovskite solar cell 2 and the metal anode 22 of the next perovskite solar cell 2 are electrically connected. The perovskite solar cells 2 in the perovskite solar cell layer are electrically connected in sequence to realize the series connection between the perovskite solar cells 2.

[0039] The metal negative electrode 22 of the perovskite cell 2 is disposed on the intermediate film 3, and the light-transmitting positive electrode 21 of the perovskite cell 2 is far away from the intermediate film 3 relative to the negative electrode of the perovskite cell 2; the light-transmitting positive electrode 21 of the perovskite cell 2 passes through the perovskite cell 2 and is electrically connected to the metal negative electrode 22 of the adjacent next perovskite cell 2.

[0040] The negative electrode of the perovskite solar cell layer is fixed on the intermediate adhesive film 3, which provides a fixing point for the perovskite solar cell layer and improves the stability of the perovskite solar cell layer.

[0041] A second gap 23 is formed between the metal negative electrodes 22 of two adjacent perovskite cells 2, and the second gap 23 is located inside a single perovskite cell 2.

[0042] The metal negative electrodes 22 of two adjacent perovskite cells 2 are separated by a second gap 23 to prevent electrical connection between multiple perovskite cells 2.

[0043] A carrier transport layer 24 is formed inside the perovskite solar cell 2, and a first channel 241 is formed inside the carrier transport layer 24. The first channel 241 penetrates the carrier transport layer 24 in the thickness direction. The light-transmitting positive electrode 21 of the perovskite solar cell 2 is electrically connected to the metal negative electrode of the adjacent subsequent perovskite solar cell 2 through the first channel 241.

[0044] The first channel 241 in the carrier transport layer 24 is used to connect the metal negative electrode of the perovskite cell 2 and the light-transmitting positive electrode 21 of the perovskite cell 2, so as to avoid electrical connection between the two metal negative electrodes of adjacent perovskite cells 2 and improve the stability of the stacked cell assembly.

[0045] The number of perovskite solar cells 2 in the perovskite solar cell layer is greater than or equal to 80 and less than or equal to 120, and the size of the perovskite solar cell layer is greater than or equal to 1m*2m.

[0046] The large-area perovskite solar cell 2 is divided into 100 sub-cells by laser scribing. Each sub-cell has an open-circuit voltage of 1.0V, and the open-circuit voltage of the large-area perovskite solar cell 2 is 100V. The total voltage of the 100 perovskite solar cells 2 connected in series is similar to that of the total voltage of the crystalline silicon solar cell layer.

[0047] The crystalline silicon solar cell layer includes multiple solar cells of the same specifications. The number of solar cells is greater than or equal to 120 and less than or equal to 150. The solar cells are connected in series to form 6 solar cell strings. Each solar cell string is connected in series with the other solar cells by a crystalline silicon solar cell guide strip 7. Each solar cell string includes the same number of solar cells.

[0048] Crystalline silicon cell 1 uses 166mm*83mm cells connected in series, with a total of 6 strings of cells connected in series. Each string contains 22 cells, for a total of 132 cells of 166mm*83mm size. The open-circuit voltage of each cell is 0.750V, and the total open-circuit voltage of the crystalline silicon cell 1 strings is 99V. The total voltage of the crystalline silicon cell 1 strings is similar to that of the perovskite cell 2 strings, thus meeting the requirements for parallel connection.

[0049] The stacked battery assembly also includes a junction box 8, and the positive terminal busbar 4 and the negative terminal busbar 5 are connected to the junction box 8.

[0050] The total positive and negative terminals of the perovskite battery layer and the crystalline silicon battery layer connected in parallel are connected to junction box 8. Since the positive terminal busbar 4 and the negative terminal busbar 5 are connected first, only one junction box 8 is needed, and only one inverter is needed at the corresponding power station end, which reduces production costs.

[0051] The stacked battery assembly also includes a frame 6, which surrounds and seals the perovskite battery layer and the crystalline silicon battery layer.

[0052] The frame 6 is used to seal the stacked battery module and improve its stability.

[0053] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A stacked solar cell assembly, the stacked solar cell assembly comprising a crystalline silicon solar cell layer and a perovskite solar cell layer, the crystalline silicon solar cell layer and the perovskite solar cell layer being stacked along the thickness direction of the stacked solar cell assembly, and an interlayer film (3) being disposed between the crystalline silicon solar cell layer and the perovskite solar cell layer, the crystalline silicon solar cell layer comprising a plurality of crystalline silicon solar cells (1) connected in series, and the perovskite solar cell layer comprising a plurality of perovskite solar cells (2) connected in series, characterized in that, The stacked battery assembly also includes a positive electrode busbar (4), a negative electrode busbar (5), and a crystalline silicon battery guide bar (7). The light-transmitting positive electrode (21) and the metal negative electrode (22) of the adjacent perovskite battery (2) are connected in sequence. The two ends of the crystalline silicon battery guide bar (7) are respectively connected to the positive electrode and the negative electrode of the adjacent crystalline silicon battery (1). The negative electrode of multiple perovskite cells (2) connected in series is connected in parallel with the negative electrode of multiple crystalline silicon cells (1) connected in series, and is electrically connected to the negative electrode busbar (5). The positive electrode of multiple crystalline silicon cells (1) connected in series is connected in parallel with the light-transmitting positive electrode (21) of multiple perovskite cells (2) connected in series, and is electrically connected to the positive electrode busbar (4).

2. The stacked battery assembly according to claim 1, characterized in that, A first interval is formed between the plurality of the perovskite cells (2), the metal negative electrode (22) of the perovskite cell (2) extends into the first interval, and the portion of the metal negative electrode (22) located in the first interval contacts the adjacent perovskite cell (2).

3. The stacked battery assembly according to claim 2, characterized in that, The first end of the metal negative electrode (22) of the perovskite cell (2) is electrically connected to the light-transmitting positive electrode (21) of the adjacent previous perovskite cell (2), and the second end of the metal negative electrode (22) of the perovskite cell (2) is located inside the perovskite cell.

4. The stacked battery assembly according to claim 3, characterized in that, The metal negative electrode (22) of the perovskite cell (2) is disposed on the intermediate film (3), and the light-transmitting positive electrode (21) of the perovskite cell (2) is far away from the intermediate film (3) relative to the negative electrode of the perovskite cell (2); The light-transmitting positive electrode (21) of the perovskite cell (2) passes through the perovskite cell (2) and is electrically connected to the metal negative electrode of the adjacent subsequent perovskite cell.

5. The stacked battery assembly according to claim 4, characterized in that, A second gap (23) is formed between the metal negative electrodes of two adjacent perovskite cells, and the second gap (23) is located inside a single perovskite cell (2).

6. The stacked battery assembly according to claim 4, characterized in that, A carrier transport layer (24) is formed in the perovskite cell (2), and a first channel (241) is formed in the carrier transport layer (24). The first channel (241) penetrates the carrier transport layer (24) in the thickness direction. The light-transmitting positive electrode (21) of the perovskite cell (2) is electrically connected to the metal negative electrode of the adjacent subsequent perovskite cell through the first channel (241).

7. The tandem battery assembly according to any one of claims 1-6, characterized in that, The number of perovskite solar cells (2) in the perovskite solar cell layer is greater than or equal to 80 and less than or equal to 120, and the size of the perovskite solar cell layer is greater than or equal to 1m*2m.

8. The tandem battery assembly according to any one of claims 1-6, characterized in that, The crystalline silicon solar cell layer includes multiple solar cells of the same specifications. The number of solar cells is greater than or equal to 120 and less than or equal to 150. The solar cells are connected in series to form 6 solar cell strings. Each solar cell string is connected in series with the other solar cells by a crystalline silicon solar cell guide strip (7). Each solar cell string includes the same number of solar cells.

9. The tandem battery assembly according to any one of claims 1-6, characterized in that, The stacked battery assembly also includes a junction box (8), and the positive terminal busbar (4) and the negative terminal busbar (5) are connected to the junction box (8).

10. The tandem battery assembly according to any one of claims 1-6, characterized in that, The stacked battery assembly further includes a frame that surrounds and seals the perovskite battery layer and the crystalline silicon battery layer.

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