Perovskite double-sided laminated battery assembly

Abstract

The invention provides a perovskite double-sided laminated battery assembly, and the battery assembly comprises a first battery unit and a second battery unit, and the number relation of narrow-band-gap perovskite sub-battery units in the first battery unit and / or wide-band-gap perovskite sub-battery units in the second battery unit is adjusted, so that the narrow-band-gap perovskite sub-battery units in the first battery unit and / or the wide-band-gap perovskite sub-battery units in the second battery unit can be obtained. The output power supply of the first battery unit is matched with the output voltage of the second battery unit, so that the positive electrode of the first battery unit and the positive electrode of the second battery unit as well as the negative electrode of the first battery unit and the negative electrode of the second battery unit can converge together and output electric energy to the outside. According to the battery assembly provided by the invention, the use cost of accessory equipment such as a rear-end junction box and an inverter of an existing four-end double-sided laminated battery assembly is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell production technology, and in particular to a perovskite double-sided laminated cell assembly. Background Art

[0002] Perovskite solar cells have developed rapidly due to their outstanding advantages. Tandem perovskite solar cells achieve the segmented utilization of the solar spectrum by stacking solar cells with different band gaps from top to bottom in the order of band gap from wide to narrow, thereby effectively broadening the spectral energy absorption range of sunlight and reducing thermal relaxation losses. Therefore, perovskite double-sided tandem solar cell modules have gradually become a hot spot in the research of high-efficiency photovoltaic technology.

[0003] The existing perovskite double-sided laminated battery assembly includes a two-terminal perovskite double-sided laminated battery assembly and a four-terminal perovskite double-sided laminated battery assembly. Among them, the perovskite double-sided laminated battery assembly is composed of a monolithically integrated bottom narrow-bandgap perovskite battery unit and a top wide-bandgap perovskite battery unit. The two battery units are prepared in sequence and connected by a tunneling layer to form a whole. This laminated structure can greatly reduce the manufacturing cost of the battery, but there are generally problems such as high difficulty in the manufacturing process and low stability of the structure and output. The four-terminal perovskite double-sided laminated battery assembly is composed of a bottom narrow-bandgap perovskite battery unit and a top wide-bandgap perovskite battery unit independently stacked, thereby reducing the process manufacturing difficulty of the laminated structure and improving the internal structure and output stability of the battery. However, the two battery units usually need to be configured with independent connection circuits and inverters and other devices, resulting in a high manufacturing cost of the battery assembly.

[0004] Therefore, how to provide a perovskite double-sided laminated battery assembly that can reduce the manufacturing cost and process difficulty of the battery assembly and ensure the stability of the internal structure and output of the battery has become one of the technical problems that people in this field urgently need to solve. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of the present application is to propose a perovskite double-sided laminated battery assembly that can reduce the manufacturing cost and process difficulty of the battery assembly and ensure the stability of the internal structure and output of the battery.

[0007] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a method for preparing a germanium-tin epitaxial structure, comprising:

[0008] A first battery cell, the first battery cell comprising a plurality of narrow bandgap perovskite sub-battery cells, wherein the plurality of narrow bandgap perovskite sub-battery cells are connected in series and / or in parallel with each other;

[0009] A second battery unit is stacked on the first battery unit; the second battery unit includes a plurality of wide bandgap perovskite sub-battery units, and the plurality of wide bandgap perovskite sub-battery units are connected in series and / or in parallel with each other;

[0010] a first bus bar and a second bus bar, the first bus bar being connected to the positive electrode of the first battery unit, the second bus bar being connected to the positive electrode of the second battery unit, and the second bus bar and the first bus bar being electrically connected to each other through a first connecting unit;

[0011] A third bus bar and a fourth bus bar, wherein the third bus bar is connected to the negative electrode of the first battery unit, the fourth bus bar is connected to the negative electrode of the second battery unit, and the fourth bus bar and the third bus bar are electrically connected to each other through a second connection unit.

[0012] Optionally, the first battery cell includes a first base surface and a first surface relative to each other, and the second battery cell includes a second base surface and a second surface relative to each other; wherein the first surface is arranged on a side close to the second battery cell, and the first base surface is arranged on a side away from the second battery cell; and the second surface is arranged on a side close to the first battery cell, and the second base surface is arranged on a side away from the first battery cell.

[0013] Optionally, the battery assembly further includes an intermediate adhesive film, which is disposed between the first battery cell and the second battery cell to separate the first surface from the second surface.

[0014] Optionally, the battery assembly further includes a first substrate and a second substrate, wherein the first substrate is disposed on a side of the first battery unit close to the first base surface, and the second substrate is disposed on a side of the second battery unit close to the second base surface.

[0015] Optionally, the narrow-bandgap perovskite sub-battery unit includes a narrow-bandgap first electrode layer, a narrow-bandgap first transport layer, a narrow-bandgap perovskite active layer, a narrow-bandgap second transport layer and a narrow-bandgap second electrode layer stacked in sequence on the first substrate; the wide-bandgap perovskite sub-battery unit includes a wide-bandgap first electrode layer, a wide-bandgap first transport layer, a wide-bandgap perovskite active layer, a wide-bandgap second transport layer and a wide-bandgap second electrode layer stacked in sequence on the second substrate; wherein the narrow-bandgap first transport layer is a hole transport layer or an electron transport layer, and the narrow-bandgap second transport layer is an electron transport layer or a hole transport layer; the wide-bandgap first transport layer is a hole transport layer or an electron transport layer, and the wide-bandgap second transport layer is an electron transport layer or a hole transport layer.

[0016] Optionally, the battery assembly also includes a first packaging film and a second packaging film, the first packaging film is arranged between the first substrate and the first battery cell, and encapsulates the first base surface of the narrow-bandgap first electrode layer close to the first substrate side; the second packaging film is arranged between the second substrate and the second battery cell, and encapsulates the second base surface of the wide-bandgap first electrode layer close to the second substrate side.

[0017] Optionally, the battery assembly further includes a side adhesive film, which is disposed between the first substrate and the second substrate, and surrounds and covers the sides of the first battery cell, the intermediate adhesive film, and the second battery cell which are disposed between the first substrate and the second substrate and stacked on each other.

[0018] Optionally, the battery assembly further includes a first connection terminal and a second connection terminal, the first connection terminal being electrically connected to the first bus bar or the third bus bar, and the second connection terminal being electrically connected to the second bus bar or the fourth bus bar.

[0019] Optionally, the number of narrow-bandgap perovskite sub-battery cells connected in series and / or in parallel in the first battery cell is different from the number of wide-bandgap perovskite sub-battery cells connected in series and / or in parallel in the second battery cell, and the output voltages of the first battery cell and the second battery cell match each other.

[0020] Optionally, a voltage difference deviation rate of the output voltage between the first battery unit and the second battery unit is less than 5%.

[0021] The perovskite double-sided stacked battery assembly provided by the present application has at least the following beneficial effects:

[0022] The present application provides a perovskite double-sided laminated battery assembly, which includes a first battery unit and a second battery unit. By adjusting the number relationship of the narrow-bandgap perovskite sub-battery unit in the first battery unit and / or the wide-bandgap perovskite sub-battery unit in the second battery unit, the output power of the first battery unit and the output voltage of the second battery unit are matched with each other, so that the positive electrode of the first battery unit and the positive electrode of the second battery unit, as well as the negative electrode of the first battery unit and the negative electrode of the second battery unit can be converged together and output electrical energy to the outside. The battery assembly provided by the present application reduces the number and cost of auxiliary equipment such as the rear-end junction box and inverter of the existing four-terminal double-sided laminated battery assembly.

[0023] At the same time, since the first battery cell and the second battery cell are respectively used as independent battery cells, they can be prepared separately without considering issues such as process compatibility, process matching, and output current matching during the preparation of the two-terminal stacked battery assembly. The battery assembly provided in the present application reduces the manufacturing cost and process manufacturing difficulty of the battery assembly, ensures the stability of the internal structure and output of the battery, and improves the feasibility and yield of mass production.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of a perovskite double-sided stacked battery assembly according to an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the longitudinal cross-sectional structure of a perovskite double-sided stacked battery assembly according to an embodiment of the present application.

[0028] 101 first bus bar; 102 second bus bar; 103 third bus bar; 104 fourth bus bar; 105 first connection unit; 106 second connection unit; 110 first battery unit; 1101 first base surface; 1102 first surface; 1201 second base surface; 1202 second surface; 120 second battery unit; 130 first substrate; 140 second substrate; 150 intermediate adhesive film; 160 side adhesive film. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] The existing perovskite double-sided stacked battery components generally include two-terminal perovskite double-sided stacked battery components and four-terminal perovskite double-sided stacked battery components. Among them, the perovskite double-sided stacked battery component is composed of a monolithically integrated bottom narrow-bandgap perovskite battery unit and a top wide-bandgap perovskite battery unit. The two battery units are prepared in sequence and connected by a tunneling layer to form a whole. The advantage of this stacked structure is that it can reduce the manufacturing cost of the battery. However, the disadvantages include at least the following points:

[0031] 1) The currents of the two battery cells need to be matched, that is, the light absorption capacity of the two battery cells needs to be adjusted so that they produce the same or similar current under sunlight. 2) The two battery cells are prepared sequentially and deposited on the same substrate, which is difficult to prepare and the compatibility of the processes during sequential preparation needs to be considered. 3) For perovskite-perovskite stacks, the coating of the upper wide-bandgap perovskite film layer will also damage the lower narrow-bandgap perovskite film layer.

[0032] The four-terminal perovskite double-sided stacked battery module is composed of a bottom narrow-bandgap perovskite battery unit and a top wide-bandgap perovskite battery unit stacked independently. This battery structure has four output terminals, so there is no electrical connection between the two battery power sources. Each battery has an independent output, which means that the two battery cells of this battery structure can be prepared separately, without considering the current matching and preparation process compatibility between the battery cells. The disadvantage is that the component requires two sets of busbars and junction boxes, and the power station system needs to be equipped with two independent inverters and other auxiliary equipment, which will result in higher system costs.

[0033] Based on the above problems, an embodiment of the present application provides a perovskite double-sided stacked battery assembly, including a first battery cell and a second battery cell. By adjusting the quantitative relationship between the narrow-bandgap perovskite sub-battery cells in the first battery cell and / or the wide-bandgap perovskite sub-battery cells in the second battery cell, the output power of the first battery cell and the output voltage of the second battery cell are matched with each other, so that the positive electrode of the first battery cell and the positive electrode of the second battery cell, as well as the negative electrode of the first battery cell and the negative electrode of the second battery cell can be converged to output electrical energy to the outside, thereby reducing the number and cost of ancillary equipment such as rear-end junction boxes and inverters.

[0034] According to one aspect of the present application, a perovskite double-sided stacked battery assembly is provided, such as Figure 1 and Figure 2 As shown, the battery assembly includes a first battery cell 110 and a second battery cell 120. The first battery cell 110 includes a plurality of narrow bandgap perovskite sub-battery cells, and the plurality of narrow bandgap perovskite sub-battery cells are connected in series and / or in parallel with each other. The second battery cell 120 is stacked on the first battery cell 110, and includes a plurality of wide bandgap perovskite sub-battery cells, and the plurality of wide bandgap perovskite sub-battery cells are connected in series and / or in parallel with each other.

[0035] By connecting a plurality of narrow bandgap perovskite sub-battery units in series and / or in parallel, and connecting a plurality of wide bandgap perovskite sub-battery units in series and / or in parallel, and appropriately adjusting the number of narrow bandgap perovskite sub-battery units and the number of wide bandgap perovskite sub-battery units, the output voltage of the first battery unit 110 can be substantially equal to the output voltage of the second battery unit 120, thereby solving the problem of output voltage mismatch between the two battery units of the double-sided laminated battery. In other words, the specific number of the bandgap perovskite sub-battery units and the specific number of the wide bandgap perovskite sub-battery units can be the same or different, and it is only necessary to appropriately adjust the series and / or parallel connection mode between the narrow bandgap perovskite sub-battery units and / or the wide bandgap perovskite sub-battery units, and make the output voltages of the first battery unit 110 and the second battery unit 120 match each other.

[0036] As an example, the voltage deviation rate of the output voltages of the first battery unit 110 and the second battery unit 120 should not be greater than 5%, that is, the output voltage V1 of the first battery unit 110 and the output voltage V2 of the second battery power source satisfy (V2-V1) / (V2+V1)≤5%.

[0037] Therefore, by setting the first bus bar 101, the second bus bar 102, the third bus bar 103 and the fourth bus bar 104, and connecting the first bus bar 101 to the positive electrode of the first battery cell 110, the second bus bar 102 to the positive electrode of the second battery cell 120, the third bus bar 103 to the negative electrode of the first battery cell 110, and the fourth bus bar 104 to the negative electrode of the second battery cell, and the second bus bar 102 and the first bus bar 101 are electrically connected to each other, and the fourth bus bar 104 and the third bus bar 103 are electrically connected to each other, that is, the output voltage of the first battery cell 110 and the output voltage of the second battery cell 120 can be output to the rear-end auxiliary equipment through the first bus bar 101 and the second bus bar 102 (or the third bus bar 103 and the fourth bus bar 104), thereby reducing the number of rear-end auxiliary equipment used, and further reducing the application cost of the auxiliary equipment.

[0038] At the same time, since the first battery cell 110 and the second battery cell 120 are respectively used as independent battery cells, they can be prepared independently without considering issues such as process compatibility, process matching, and output current matching during the preparation of the two-terminal stacked battery assembly, thereby reducing the manufacturing cost and process manufacturing difficulty of the battery assembly, ensuring the stability of the internal structure and output of the battery, and improving the feasibility and yield of mass production.

[0039] It should be noted that the present application does not specifically limit the specific electrical connection form between the second bus bar 102 and the first bus bar 101, and between the fourth bus bar 104 and the third bus bar 103. For example, the second bus bar 102 and the first bus bar 101 can be electrically connected to each other by a first connection unit 105 at a different position or with a different structural form, and the fourth bus bar 104 and the third bus bar 103 can be electrically connected to each other by a second connection unit 106 at a different position or with a different structural form.

[0040] In some embodiments, the first battery cell 110 includes a first base surface 1101 and a first surface 1102 opposite to each other, and the second battery cell 120 includes a second base surface 1201 and a second surface 1202 opposite to each other. The first surface 1102 is disposed on a side close to the second battery cell 120, the first base surface 1101 is disposed on a side away from the second battery cell 120, the second surface 1202 is disposed on a side close to the first battery cell 110, and the second base surface 1201 is disposed on a side away from the first battery cell 110.

[0041] Furthermore, an intermediate adhesive film 150 is also included between the first battery cell 110 and the second battery cell 120. By disposing the intermediate adhesive film 150 between the first battery cell 110 and the second battery cell 120, the first surface 1102 of the first battery cell 110 and the second surface 1202 of the second battery cell 120 can be spaced apart, so that the first battery cell 110 and the second battery cell 120 stacked on each other remain independent, thereby ensuring the stability of the internal structure of the battery assembly.

[0042] Among them, the intermediate film 150 can adopt conventional packaging films in the field, including but not limited to at least one of ethylene-vinyl acetate copolymer, perhydropolysilazane, perfluoropolyalkylene oxide, polyethylene-octene copolymer, polyvinyl butyral, polymethyl methacrylate, thermoplastic polyurethane, polyethylene terephthalate, polydimethylsiloxane, polyethylene glycol, polyvinyl pyrrolidone and other materials.

[0043] In some embodiments, the battery assembly further includes a first substrate 130 and a second substrate 140. The first substrate 130 is disposed on a side of the first battery cell 110 close to the first base surface 1101, and is used to provide bottom support and physical protection for the formation of the first battery cell 110; the second substrate 140 is disposed on a side of the second battery cell 120 close to the second base surface 1201, and is used to provide bottom support and physical protection for the formation of the second battery cell 120.

[0044] Each narrow-bandgap perovskite sub-battery unit may specifically include a narrow-bandgap bottom electrode layer, a narrow-bandgap first transmission layer, a narrow-bandgap perovskite active layer, a narrow-bandgap second transmission layer and a narrow-bandgap second electrode layer stacked in sequence on the first substrate 130; each wide-bandgap perovskite sub-battery unit may specifically include a wide-bandgap bottom electrode layer, a wide-bandgap first transmission layer, a wide-bandgap perovskite active layer, a wide-bandgap second transmission layer and a wide-bandgap second electrode layer stacked in sequence on the second substrate 140.

[0045] Among them, the narrow bandgap first transport layer is a hole transport layer or an electron transport layer, and the narrow bandgap second transport layer is an electron transport layer or a hole transport layer; the wide bandgap first transport layer is a hole transport layer or an electron transport layer, and the wide bandgap second transport layer is an electron transport layer or a hole transport layer. For example, the narrow bandgap first transport layer is a hole transport layer, the narrow bandgap second transport layer is an electron transport layer, the wide bandgap first transport layer is a hole transport layer, and the wide bandgap second transport layer is an electron transport layer. Alternatively, the narrow bandgap first transport layer is an electron transport layer, the narrow bandgap second transport layer is a hole transport layer, the wide bandgap first transport layer is an electron transport layer, and the wide bandgap second transport layer is a hole transport layer.

[0046] The material of the first substrate 130 includes but is not limited to any one of the materials or properties such as flexibility, rigidity, transparency, color, glass-based, stainless steel-based, etc. Among them, since the second substrate 140 is the light-receiving surface of the battery assembly, the second substrate 140 needs to be a transparent substrate among the above materials.

[0047] The preparation material of the narrow bandgap first electrode layer includes but is not limited to indium tin oxide, fluorine-doped tin oxide, zinc-doped tin oxide, aluminum-doped zinc oxide, gold, silver, copper, and aluminum, while the materials used for the narrow bandgap second electrode layer, the wide bandgap first electrode layer, and the wide bandgap second electrode layer are transparent materials among the above materials.

[0048] The preparation material of the electron transport layer includes but is not limited to any one of titanium oxide, tin oxide, zinc oxide, niobium oxide, [6,6]-phenyl-C61-butyric acid isomethyl ester (PC61BM), fullerene (C60) and the like; the preparation material of the hole transport layer includes but is not limited to any one of nickel oxide, molybdenum oxide, cuprous oxide, copper phthalocyanine, poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS), tetrakis[N,N-di(4-methoxyphenyl)amino]spirobifluorene (Spiro-OMeTAD), poly 3-hexylthiophene (P3HT), poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) and the like.

[0049] The preparation materials for the wide-bandgap perovskite active layer and the narrow-bandgap perovskite active layer include, but are not limited to, cesium-doped formamidinium lead iodide bromide [Csx FA1-x Pb(I y Br1-y)3] (where 0 < x < 1, 0 < y < 1), tin-doped methylammonium lead iodide (MAPbx Sn1-x I3) (where 0 < x < 1), tin-doped formamidinium lead iodide (FAPbx Sn1-x I3) (where 0 < x < 1), and any one of the like materials. In the above materials, the component doping ratios of the preparation materials are different, the values of x and y are different, and the bandgap of the materials also changes. In addition, the preparation material for the wide-bandgap perovskite active layer can also be inorganic perovskite cesium lead iodide (CsPbI3), and the preparation material for the narrow-bandgap perovskite active layer 410 can also be cesium tin iodide (CsSnI3) or formamidinium lead iodide (FAPbI3). The material used for the wide-bandgap perovskite active layer has a bandgap of 1.7 - 2.1 eV, and the material used for the narrow-bandgap perovskite active layer has a bandgap of 1.2 - 1.5 eV.

[0050] In some embodiments, the battery assembly further includes a first encapsulation film and a second encapsulation film. The first encapsulation film is disposed between the first substrate 130 and the first battery unit 110, and is used to encapsulate the first bottom surface 1101 of the narrow-bandgap first electrode layer on the side close to the first substrate 130; the second encapsulation film is disposed between the second substrate and the second battery unit 120, and is used to encapsulate the second bottom surface 1201 of the wide-bandgap first electrode layer on the side close to the second substrate 140.

[0051] Furthermore, the battery assembly further includes a side film 160. The side film 160 is disposed between the first substrate 130 and the second substrate 140, and is used to bond the first substrate 130 and the second substrate 140, and to surround and cover the sides of the mutually stacked first battery unit 110, the intermediate film 150, and the second battery unit 120, so as to perform encapsulation and protection on the sides of the first battery unit 110 and the second battery unit 120.

[0052] Among them, the materials of the first encapsulation film, the second encapsulation film, and the side film 160 can adopt conventional encapsulation films in the art. The materials of the first encapsulation film and the second encapsulation film include, but are not limited to, at least one of materials such as ethylene-vinyl acetate copolymer, perhydropolysilazane, perfluoropolyepoxide, polyethylene-octene copolymer, polyvinyl butyral, polymethyl methacrylate, thermoplastic polyurethane, polyethylene terephthalate, polydimethylsiloxane, polyethylene glycol, polyvinylpyrrolidone, etc. The material of the side film 160 includes, but is not limited to, butyl rubber.

[0053] In some embodiments, the battery assembly further includes a first connection terminal and a second connection terminal, wherein the first connection terminal is electrically connected to the first bus bar 101, and the second connection terminal is electrically connected to the second bus bar 102. Alternatively, the first connection terminal is electrically connected to the third bus bar 103, and the second connection terminal is electrically connected to the fourth bus bar 104.

[0054] Since the output voltages of the first battery cell 110 and the second battery power source are substantially equal, the first battery cell 110 and the second battery cell 120 can output electric energy directly to external auxiliary equipment, such as a junction box, an inverter and other auxiliary equipment, through the first connection terminal and the second connection terminal to supply power to a power grid or electrical equipment, and a single set of auxiliary equipment can meet the common power supply requirements of the first battery cell 110 and the second battery cell 120 in the battery assembly of the present application, thereby reducing the use cost of existing four-terminal double-sided laminated battery assemblies.

[0055] In order to facilitate the distinction between the positive and negative poles of the first battery cell 110 and the second battery cell 120, the order of the marking positions of the marking lines on the first battery cell 110 and the second battery cell 120 can be adjusted respectively. For example, the marking lines on the first battery cell 110 are arranged from left to right in the order of the first marking line P1, the second marking line P2 and the third marking line P3, and the marking lines on the second battery cell 120 are arranged from left to right in the order of the third marking line P3, the second marking line P2 and the first marking line P1.

[0056] In summary, the present application provides a perovskite double-sided laminated battery assembly, which includes a first battery unit 110 and a second battery unit 120. By adjusting the number relationship of the narrow-bandgap perovskite sub-battery unit in the first battery unit 110 and / or the wide-bandgap perovskite sub-battery unit in the second battery unit 120, the output power of the first battery unit 110 and the output voltage of the second battery unit 120 are matched with each other, so that the positive electrode of the first battery unit 110 and the positive electrode of the second battery unit 120, as well as the negative electrode of the first battery unit 110 and the negative electrode of the second battery unit 120 can be converged together and output electrical energy to the outside. The battery assembly provided by the present application reduces the number and cost of auxiliary equipment such as the rear-end junction box and inverter of the existing four-terminal double-sided laminated battery assembly.

[0057] At the same time, since the first battery cell 110 and the second battery cell 120 are respectively used as independent battery cells, they can be prepared independently without considering issues such as process compatibility, process matching, and output current matching of the two-terminal stacked battery assembly during the preparation process. The battery assembly provided in the present application reduces the manufacturing cost and process manufacturing difficulty of the battery assembly, ensures the stability of the internal structure and output of the battery, and improves the feasibility and yield of mass production.

[0058] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A perovskite double-sided laminated battery assembly, characterized in that: include: A first battery cell, the first battery cell comprising a plurality of narrow bandgap perovskite sub-battery cells, wherein the plurality of narrow bandgap perovskite sub-battery cells are connected in series and / or in parallel with each other; A second battery unit is stacked on the first battery unit; the second battery unit includes a plurality of wide bandgap perovskite sub-battery units, and the plurality of wide bandgap perovskite sub-battery units are connected in series and / or in parallel with each other; a first bus bar and a second bus bar, the first bus bar being connected to the positive electrode of the first battery unit, the second bus bar being connected to the positive electrode of the second battery unit, and the second bus bar and the first bus bar being electrically connected to each other through a first connecting unit; A third bus bar and a fourth bus bar, wherein the third bus bar is connected to the negative electrode of the first battery unit, the fourth bus bar is connected to the negative electrode of the second battery unit, and the fourth bus bar and the third bus bar are electrically connected to each other through a second connection unit.

2. The battery assembly according to claim 1, characterized in that: The first battery cell includes a first base surface and a first surface relative to each other, and the second battery cell includes a second base surface and a second surface relative to each other; wherein the first surface is arranged on a side close to the second battery cell, and the first base surface is arranged on a side away from the second battery cell; the second surface is arranged on a side close to the first battery cell, and the second base surface is arranged on a side away from the first battery cell.

3. The battery assembly according to claim 2, characterized in that: The battery assembly further includes an intermediate adhesive film, which is disposed between the first battery cell and the second battery cell to separate the first surface from the second surface.

4. The battery assembly according to claim 3, characterized in that: The battery assembly further includes a first substrate and a second substrate. The first substrate is disposed on a side of the first battery unit close to the first base surface, and the second substrate is disposed on a side of the second battery unit close to the second base surface.

5. The battery assembly according to claim 4, characterized in that: The narrow-bandgap perovskite sub-battery unit includes a narrow-bandgap first electrode layer, a narrow-bandgap first transport layer, a narrow-bandgap perovskite active layer, a narrow-bandgap second transport layer and a narrow-bandgap second electrode layer stacked in sequence on the first substrate; the wide-bandgap perovskite sub-battery unit includes a wide-bandgap first electrode layer, a wide-bandgap first transport layer, a wide-bandgap perovskite active layer, a wide-bandgap second transport layer and a wide-bandgap second electrode layer stacked in sequence on the second substrate; wherein the narrow-bandgap first transport layer is a hole transport layer or an electron transport layer, and the narrow-bandgap second transport layer is an electron transport layer or a hole transport layer; the wide-bandgap first transport layer is a hole transport layer or an electron transport layer, and the wide-bandgap second transport layer is an electron transport layer or a hole transport layer.

6. The battery assembly according to claim 5, characterized in that: The battery assembly also includes a first packaging film and a second packaging film. The first packaging film is arranged between the first substrate and the first battery cell to encapsulate the first base surface of the narrow-bandgap first electrode layer close to the first substrate side; the second packaging film is arranged between the second substrate and the second battery cell to encapsulate the second base surface of the wide-bandgap first electrode layer close to the second substrate side.

7. The battery assembly according to claim 4, characterized in that: The battery assembly also includes a side adhesive film, which is arranged between the first substrate and the second substrate, and surrounds and covers the sides of the first battery unit, the intermediate adhesive film and the second battery unit which are arranged between the first substrate and the second substrate and stacked on each other.

8. The battery assembly according to claim 1, characterized in that: The battery assembly further includes a first connection terminal and a second connection terminal, wherein the first connection terminal is electrically connected to the first bus bar or the third bus bar, and the second connection terminal is electrically connected to the second bus bar or the fourth bus bar.

9. The battery assembly according to claim 1, characterized in that: The number of narrow-bandgap perovskite sub-battery cells connected in series and / or in parallel in the first battery cell is different from the number of wide-bandgap perovskite sub-battery cells connected in series and / or in parallel in the second battery cell, and the output voltages of the first battery cell and the second battery cell match each other.

10. The battery assembly according to claim 9, characterized in that: A voltage difference deviation rate of output voltages between the first battery unit and the second battery unit is less than 5%.

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