Laminated battery assembly, preparation method thereof and laminated battery

Abstract

The embodiment of the invention provides a laminated battery assembly and a preparation method thereof, and a laminated battery, and the laminated battery assembly comprises a first battery unit which is provided with a light incident surface, and the light incident surface is provided with a concave-convex structure; the second battery unit comprises a first functional layer stacked on the light incident surface, a photosensitive layer stacked on one side, away from the light incident surface, of the first functional layer and a second functional layer stacked on one side, away from the first functional layer, of the photosensitive layer, the first functional layer is provided with a planarization layer, and the planarization layer is provided with a planarization surface away from one side of the light incident surface. According to the embodiment of the invention, the concave-convex structure of the light incident surface of the first battery unit can be reserved, and meanwhile, the photosensitive layer can be subjected to film formation by adopting a wet coating process, so that the process difficulty is reduced, and the efficiency of the laminated battery assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a laminated battery assembly and a preparation method thereof, and a laminated battery. Background Art

[0002] By stacking the first battery unit and the second battery unit to form a stacked battery assembly, the misalignment of absorption wavelengths of different battery units can be used to effectively broaden the spectral response range, thereby further improving the photoelectric conversion efficiency of the photovoltaic device.

[0003] However, the laminated battery assembly in the related art still has some shortcomings. Summary of the invention

[0004] The embodiments of the present application provide a laminated battery assembly and a preparation method thereof, and a laminated battery, which are intended to retain the concave-convex structure of the light incident surface of the first battery unit while also facilitating the formation of a photosensitive layer using a wet coating process to reduce the process difficulty and improve the efficiency of the laminated battery.

[0005] An embodiment of the first aspect of the present application provides a stacked battery assembly, including: a first battery unit, having a light incident surface, the light incident surface having a concave-convex structure; a second battery unit, including a first functional layer stacked on the light incident surface, a photosensitive layer stacked on the side of the first functional layer away from the light incident surface, and a second functional layer stacked on the side of the photosensitive layer away from the first functional layer, the first functional layer having a flattening layer, and the flattening layer having a flattening surface on the side away from the light incident surface.

[0006] According to an embodiment of the first aspect of the present application, the photosensitive layer includes a perovskite material.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the first battery cell is a crystalline silicon battery cell.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the second battery cell is a perovskite battery cell.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the planarization layer has a preset transmittance for light in the first wavelength band, and the planarization layer is conductive.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the range of the first wavelength band is 700nm-1200nm.

[0011] According to any of the aforementioned implementations of the first aspect of the present application, the preset transmittance is not less than 60%.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, the planarization layer is formed by leveling and curing the fluid.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the planarization layer includes at least one of graphene, polycarbonate doped material, polymer of 3,4-ethylenedioxythiophene monomer, sodium polystyrene sulfonate doped material or delafossilite thin film material.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the first concave-convex structure includes crests and troughs, and the height difference between the crests and the troughs is not greater than the thickness of the planarization layer.

[0015] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the planarization layer is 0.5 μm to 2 μm.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the planarization layer is stacked on the light incident surface.

[0017] According to any of the aforementioned embodiments of the first aspect of the present application, in a direction away from the first battery unit, the first functional layer includes a planarization layer, a first electrode layer and a first carrier transport layer which are arranged in sequence.

[0018] According to any of the aforementioned embodiments of the first aspect of the present application, the planarization layer is spaced apart from the light incident surface and the photosensitive layer.

[0019] According to any of the aforementioned embodiments of the first aspect of the present application, in a direction away from the first battery cell, the first functional layer includes a first electrode layer, a planarization layer and a first carrier transport layer arranged in sequence, the concave-convex structure includes crests and troughs, and the first electrode layer includes a first convex portion arranged on the crest and a first concave portion arranged on the trough.

[0020] According to any of the aforementioned embodiments of the first aspect of the present application, in a direction away from the first battery cell, the first functional layer includes a first electrode layer, a first carrier transport layer, a planarization layer and a passivation layer arranged in sequence, the concave-convex structure includes crests and troughs, the first electrode layer includes a first convex portion arranged on the crest and a first concave portion arranged on the trough, and the first carrier transport layer includes a second convex portion arranged on the first convex portion and a second concave portion arranged on the first concave portion.

[0021] According to any of the aforementioned embodiments of the first aspect of the present application, the planarization layer is spaced apart from the light incident surface, and the photosensitive layer and the planarization layer are stacked.

[0022] According to any of the aforementioned embodiments of the first aspect of the present application, in a direction away from the first battery cell, the first functional layer includes a first electrode layer, a first carrier transport layer and a planarization layer arranged in sequence, the concave-convex structure includes crests and troughs, the first electrode layer includes a first convex portion arranged on the crest and a first concave portion arranged on the trough, and the first carrier transport layer includes a second convex portion arranged on the first convex portion and a second concave portion arranged on the first concave portion.

[0023] According to any of the aforementioned embodiments of the first aspect of the present application, the first functional layer includes a planarization layer and a first carrier transport layer, wherein the planarization layer and the first carrier transport layer are adjacently arranged in a direction from the first functional layer to the photosensitive layer; or, the planarization layer and the first carrier transport layer are an integrally formed structure.

[0024] According to any of the aforementioned embodiments of the first aspect of the present application, the conductivity of the planarization layer is not less than the conductivity of the first carrier transport layer.

[0025] According to any of the aforementioned embodiments of the first aspect of the present application, in a direction away from the first battery unit, the second functional layer includes a second carrier transport layer and a second electrode layer which are stacked in sequence.

[0026] According to any of the aforementioned embodiments of the first aspect of the present application, a cover plate is provided on a side of the second battery cell facing away from the first battery cell, and the cover plate is connected to the second battery cell via a first adhesive film.

[0027] According to any of the aforementioned embodiments of the first aspect of the present application, a substrate is provided on a side of the first battery unit facing away from the second battery unit, and the substrate is connected to the first battery unit via a second adhesive film.

[0028] According to any of the aforementioned embodiments of the first aspect of the present application, the first battery unit has two light incident surfaces arranged opposite to each other, and a second battery unit is provided on each light incident surface.

[0029] The second aspect of the present application also provides a method for preparing a stacked battery assembly, comprising the following steps: providing a first battery unit, the first battery unit having a light incident surface, the light incident surface having a concave-convex structure; preparing a first functional layer on the light incident surface, the first functional layer having a planarization layer, the planarization layer having a planarization surface facing away from the light incident surface; preparing a photosensitive layer on the side of the first functional layer facing away from the light incident surface; and preparing a second functional layer on the side of the photosensitive layer facing away from the first functional layer.

[0030] According to an implementation of the second aspect of the present application, the step of preparing the first functional layer on the light incident surface includes: forming a planarization layer by a solution process.

[0031] According to any of the aforementioned embodiments of the second aspect of the present application, the solution method process includes at least one of slit coating, spin coating or printing.

[0032] According to any of the aforementioned embodiments of the second aspect of the present application, the first functional layer includes a planarization layer and a first carrier transport layer, and before the step of forming the planarization layer by a solution process, the material of the first carrier transport layer and the material of the planarization layer are mixed to form a fluid.

[0033] The third aspect of the present application further provides a stacked battery, which includes the stacked battery assembly described in any embodiment of the first aspect above, or includes the stacked battery assembly prepared by the preparation method described in any embodiment of the second aspect above.

[0034] In the stacked battery assembly of the present application, a planarization layer is arranged between the light incident surface and the photosensitive layer. The planarization layer has a planarization surface on the side facing away from the light incident surface. The planarization layer is used to planarize the unevenness caused by the light incident surface so that the surface of the first functional layer facing away from the light incident surface is planarized. Therefore, while retaining the concave-convex structure of the light incident surface of the first battery unit, a wet coating process can be performed on the surface of the first functional layer facing away from the light incident surface to form a photosensitive layer, thereby reducing the difficulty of the preparation process of the photosensitive layer and improving the efficiency of the stacked battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0036] Figure 1 It is a structural schematic diagram of a laminated battery assembly provided by an embodiment of the first aspect of the present application;

[0037] Figure 2 yes Figure 1 A schematic diagram of the structure of the first battery unit and the planarization layer in the stacked battery assembly shown;

[0038] Figure 3 is a structural schematic diagram of a laminated battery assembly provided by another embodiment of the first aspect of the present application;

[0039] Figure 4 yes Figure 3 A schematic diagram of the structure of the first battery unit, the first electrode layer and the planarization layer in the stacked battery assembly shown;

[0040] Figure 5 is a structural schematic diagram of a laminated battery assembly provided by yet another embodiment of the first aspect of the present application;

[0041] Figure 6 yes Figure 5 A schematic diagram of the structure of the first battery unit, the first electrode layer, the first carrier transport layer and the planarization layer in the stacked battery assembly shown;

[0042] Figure 7 is a structural schematic diagram of a laminated battery assembly provided by another embodiment of the first aspect of the present application;

[0043] Figure 8is a structural schematic diagram of a laminated battery assembly provided by another embodiment of the first aspect of the present application;

[0044] Fig. 9 yes Figure 8 A schematic diagram of the structure of the first battery unit, the first electrode layer, the first carrier transport layer and the planarization layer in the stacked battery assembly shown;

[0045] Fig.10 is a structural schematic diagram of a laminated battery assembly provided by another embodiment of the first aspect of the present application;

[0046] Fig.11 It is a step flow chart of a method for preparing a laminated battery assembly provided in an embodiment of the second aspect of the present application.

[0047] Description of reference numerals:

[0048] 1. first battery unit; 11. light incident surface; 111. concave-convex structure; 113. wave crest; 115. wave trough;

[0049] 3. Second battery unit; 31. First functional layer; 311. Planarization layer; 31A. Planarization surface; 313. First electrode layer; 3131. First convex portion; 3133. First concave portion; 315. First carrier transport layer; 3151. Second convex portion; 3153. Second concave portion; 317. Passivation layer; 33. Photosensitive layer; 35. Second functional layer; 351. Second carrier transport layer; 353. Second electrode layer;

[0050] 5. Cover plate;

[0051] 6. The first adhesive film;

[0052] 7. Substrate;

[0053] 8. Second adhesive film. DETAILED DESCRIPTION

[0054] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0055] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0057] The stacked battery assembly formed by stacking the first battery unit and the second battery unit can utilize the misalignment of the absorption wavelengths of different battery units on the upper and lower sides to effectively broaden the spectral response range, thereby further improving the photoelectric conversion efficiency of the photovoltaic device.

[0058] However, the laminated battery assembly in the related art still has some shortcomings.

[0059] In related art 1, in order to increase the light incident efficiency of the first battery cell, the light incident surface of the first battery cell is prepared with a concave-convex structure. Although the photosensitive layer of the second battery cell prepared by evaporation or evaporation combined with coating can better adapt to the light incident surface of the first battery cell, the evaporation process is difficult, the material utilization rate is low, and it will lead to an imbalance in the formula ratio of the photosensitive layer, which ultimately leads to the problem of low efficiency of the second battery cell.

[0060] In related technology 2, the light incident surface of the first battery cell is flattened or adjusted to a small velvety surface. Although this flattening treatment method can support the subsequent coating process of the photosensitive layer, it will cause the incident light to be strongly reflected at the light incident surface of the first battery cell, thereby causing the efficiency of the first battery cell to decrease.

[0061] In order to solve the above technical problems, this application is proposed. In order to better understand this application, Figures 1 to 11 The laminated battery assembly and its preparation method, and the laminated battery according to the embodiments of the present application are described in detail.

[0062] Please refer to Figure 1 and Figure 2, Figure 1 is a schematic structural diagram of a laminated battery assembly provided by an embodiment of the first aspect of the present application, Figure 2 yes Figure 1 A schematic diagram of the structure of the first battery unit and the planarization layer in the stacked battery assembly is shown.

[0063] like Figure 1 As shown, an embodiment of the present application provides a stacked battery assembly, which includes a first battery unit 1 and a second battery unit 3 which are stacked, the first battery unit 1 having a light incident surface 11, the light incident surface 11 having a concave-convex structure 111, the second battery unit 3 including a first functional layer 31 stacked on the light incident surface 11, a photosensitive layer 33 stacked on the side of the first functional layer 31 away from the light incident surface 11, and a second functional layer 35 stacked on the side of the photosensitive layer 33 away from the first functional layer 31, the first functional layer 31 having a planarization layer 311, and the planarization layer 311 having a planarization surface 31A away from the light incident surface 11.

[0064] Optionally, the light emitted by the light source irradiates the laminated battery assembly from the side of the second battery unit 3 away from the second battery unit 3. That is, the side of the second battery unit 3 away from the second battery unit 3 is the light incident side of the laminated battery assembly.

[0065] Optionally, the light source includes but is not limited to the sun.

[0066] Optionally, the light emitted by the light source includes but is not limited to irradiating the laminated battery assembly in a direct or reflected manner.

[0067] Optionally, the light emitted by the light source includes at least light of at least one wavelength in the first wavelength band and at least light of at least one wavelength in the second wavelength band. In some optional embodiments, the light emitted by the light source includes at least light of the first wavelength band and light of the second wavelength band.

[0068] Optionally, the second battery unit 3 converts the light energy of the second wavelength band emitted by the light source into electrical energy, and the light of the first wavelength band is transmitted to the first battery unit 1 through the second battery unit 3, and at least part of the light of the first wavelength band transmitted to the first battery unit 1 is incident into the first battery unit 1 through the light incident surface 11 and converted into electrical energy. In this way, the stacked battery assembly can effectively broaden the spectral response range by utilizing the misalignment of the absorption wavelengths of different battery units on the upper and lower sides, thereby further improving the photoelectric conversion efficiency of the photovoltaic device.

[0069] Optionally, the light in the first wavelength band is non-visible light, and the light in the second wavelength band is visible light.

[0070] Optionally, the photoelectric conversion efficiency of the laminated cell assembly is the ratio of the light energy converted into electrical energy by the laminated cell assembly to the light energy irradiated on the laminated cell assembly.

[0071] In the laminated battery assembly of the present application, the planarization layer 311 is arranged between the light incident surface 11 and the photosensitive layer 33, and the planarization layer 311 has a planarization surface 31A on the side away from the light incident surface 11. The planarization layer 311 flattens the unevenness caused by the light incident surface 11 so that the surface of the first functional layer 31 away from the light incident surface 11 is flattened. Therefore, while retaining the light incident surface 11 of the first battery unit 1, a wet coating process can be performed on the surface of the first functional layer 31 away from the light incident surface 11 to form a photosensitive layer 33, thereby reducing the difficulty of the preparation process of the photosensitive layer 33 and improving the efficiency of the laminated battery. That is, the laminated battery assembly of the present application, while retaining the concave-convex structure 111 of the light incident surface 11 of the first battery unit 1, is also conducive to the wet coating process of the photosensitive layer 33 to reduce the difficulty of the preparation process of the photosensitive layer 33 and improve the efficiency of the laminated battery.

[0072] In some embodiments, the photosensitive layer 33 includes a perovskite material. When the perovskite material is formed on an uneven surface to form the photosensitive layer 33, an imbalance in the perovskite formula ratio may occur.

[0073] In some embodiments, the first battery cell 1 is a crystalline silicon battery cell, and the velvet surface on the surface of the crystalline silicon battery cell has the above-mentioned concave-convex structure.

[0074] In some embodiments, the second battery cell 3 is a perovskite battery cell.

[0075] Optionally, the photosensitive layer 33 may include only one perovskite material layer, or may include at least two perovskite material layers.

[0076] Optionally, the material of the perovskite material layer includes one of inorganic perovskite, organic-inorganic hybrid perovskite, and multi-system organic-inorganic hybrid perovskite.

[0077] Optionally, when the material of the perovskite material layer includes inorganic perovskite, the inorganic perovskite includes at least one of CsPbI3, CsPbI2Br, CsPbIBr2, CsPbBr3, and CsSnI3.

[0078] Optionally, when the material of the perovskite material layer includes organic-inorganic hybrid perovskite, the organic-inorganic hybrid perovskite includes at least one of FAPbI3, MAPbI3, FAPbBr3, and MAPbBr3.

[0079] Optionally, when the material of the perovskite material layer includes a multi-system organic-inorganic hybrid perovskite, the multi-system organic-inorganic hybrid perovskite includes Cs 0.05 FA 0.9 MA 0.05 Pb(I 0.95 Br0.05 )3. Cs 0.05 FA 0.95 At least one of PbI3.

[0080] In some optional embodiments, the photosensitive layer 33 includes at least two perovskite layers.

[0081] Optionally, the materials of different perovskite layers are different.

[0082] In some embodiments, the planarization layer 311 has a preset transmittance for light in the first wavelength band, and the planarization layer 311 is conductive.

[0083] Optionally, the first wavelength band ranges from 700nm to 1200nm.

[0084] Exemplarily, the light emitted by the light source may include at least 700nm, 720nm, 740nm, 760nm, 780nm, 800nm, 820nm, 840nm, 860nm, 880nm, 900nm, 920nm, 940nm, 960nm, 980nm, 1000nm, 1020nm, 1040nm, 1060nm, 1080nm, 1100nm, 1120nm, 1140nm, 1160nm, 1180nm or 1200nm. Of course, the light emitted by the light source may include at least light of the wavelength band of any combination range of the above numerical values.

[0085] Optionally, the preset transmittance is not less than 60%. The planarization layer 311 with high transmittance can increase the incident light of the first battery unit 1, thereby improving the photoelectric conversion efficiency of the stacked battery assembly.

[0086] Exemplarily, the preset transmittance may be 60%, 63%, 65%, 68%, 70%, 73%, 75%, 78%, 80%, 83%, 85%, 88%, 90%, 93%, 95% or 99%, etc. Of course, the preset transmittance may also be any combination range of the above values.

[0087] In some embodiments, the planarization layer 311 is formed by leveling and curing a fluid.

[0088] Optionally, the fluid may adopt a self-leveling process or a non-self-leveling process or a combination of self-leveling and non-self-leveling processes. Among them, self-leveling means that the fluid is leveled under the action of its own gravity, and non-self-leveling means that the fluid is leveled under the action of an external force other than its own gravity. For example, non-self-leveling can be achieved through a solution process, which is an existing process and will not be described in detail.

[0089] Exemplarily, the solution process includes at least one of slot coating, spin coating or printing.

[0090] Optionally, the material of the planarization layer 311 includes at least one of graphene, polycarbonate doped material, polymer of 3,4-ethylenedioxythiophene monomer, sodium polystyrene sulfonate doped material or delafossite thin film material.

[0091] Optionally, the planarized surface 31A may be a plane or may be considered as a plane. The planarized surface 31A may be considered as a plane, which means that the height difference between the crest and the trough on the planarized surface 31A is very small, so that the surface of the planarized first functional layer 31 facing away from the light incident surface 11 can support the subsequent coating process of the photosensitive layer.

[0092] like Figure 2 As shown, in some embodiments, the concave-convex structure 111 includes a crest 113 and a trough 115, and the height difference between the crest 113 and the trough 115 is not greater than the thickness of the planarization layer 311. The flatness of the planarization surface 31A can be improved, so that the flatness of the surface of the first functional layer 31 away from the light incident surface 11 can be improved.

[0093] Optionally, the height difference between the crest 113 and the trough 115 is the height difference between the highest point of the highest crest 113 and the lowest point of the lowest trough 115 in the concavo-convex structure 111. Accordingly, the thickness of the planarization layer 311 is the distance between the lowest point of the lowest trough 115 in the concavo-convex structure 111 and the planarization surface 31A.

[0094] In some embodiments, the thickness of the planarization layer 311 is 0.5 μm to 2 μm. The thickness direction of the planarization layer 311 is from the first functional layer 31 to the second functional layer 35 .

[0095] Optionally, the thickness of the planarization layer 311 increases with the increase of the height difference between the wave crest 113 and the wave trough 115. This is beneficial to improving the flatness of the surface of the first functional layer 31 away from the light incident surface 11.

[0096] Optionally, the planarization layer 311 may be disposed at any position between the light incident surface 11 and the photosensitive layer 33. The planarization layer 311 may planarize the layer structure disposed on the side of the planarization layer 311 facing away from the first battery unit 1.

[0097] like Figure 1 and Figure 2 As shown, in some embodiments, the planarization layer 311 is stacked on the light incident surface 11 , that is, the planarization layer 311 has concave portions corresponding to the wave crests 113 and convex portions corresponding to the wave troughs 115 .

[0098] like Figure 1As shown, in some embodiments, in the direction away from the first battery unit 1, the first functional layer 31 includes a planarization layer 311, a first electrode layer 313 and a first carrier transport layer 315 arranged in sequence. That is, the first electrode layer 313 is stacked on the side of the planarization layer 311 away from the light incident surface 11, and the first carrier transport layer 315 is stacked on the side of the first electrode layer 313 away from the planarization layer 311.

[0099] In some embodiments, the photosensitive layer 33 is stacked on a side of the first carrier transport layer 315 facing away from the first electrode layer 313 .

[0100] In some other embodiments, the first functional layer 31 may further include a passivation layer stacked between the first carrier transport layer 315 and the photosensitive layer 33. The passivation layer may reduce surface defects of the photosensitive layer 33 to improve the photoelectric conversion efficiency.

[0101] Please also read Figures 3 to 6 , Figure 3 is a structural schematic diagram of a laminated battery assembly provided by another embodiment of the first aspect of the present application; Figure 4 yes Figure 3 A schematic diagram of the structure of the first battery unit, the first electrode layer and the planarization layer in the stacked battery assembly shown; Figure 5 is a structural schematic diagram of a laminated battery assembly provided by yet another embodiment of the first aspect of the present application; Figure 6 yes Figure 5 A schematic diagram of the structure of the first battery unit, the first electrode layer, the first carrier transport layer and the planarization layer in the stacked battery assembly is shown.

[0102] like Figure 3 and Figure 5 As shown, in some embodiments, the planarization layer 311 is spaced apart from the light incident surface 11 and the photosensitive layer 33 .

[0103] like Figure 3 and Figure 4 As shown, in some embodiments, in the direction away from the first battery unit 1, the first functional layer 31 includes a first electrode layer 313, a planarization layer 311 and a first carrier transport layer 315 arranged in sequence, and the first electrode layer 313 includes a first convex portion 3131 arranged on the wave crest 113 and a first concave portion 3133 arranged on the wave trough 115. That is, the first electrode layer 313 is stacked on the light incident surface 11, the planarization layer 311 is stacked on the side of the first electrode layer 313 away from the light incident surface 11, and the first carrier transport layer 315 is arranged on the side of the planarization layer 311 away from the first electrode layer 313.

[0104] In some embodiments, the photosensitive layer 33 is stacked on a side of the first carrier transport layer 315 facing away from the planarization layer 311 .

[0105] In some other embodiments, the first functional layer 31 may further include a passivation layer stacked between the first carrier transport layer 315 and the photosensitive layer 33 .

[0106] like Figure 5 and Figure 6 As shown, in the direction away from the first battery cell 1, the first functional layer 31 includes a first electrode layer 313, a first carrier transport layer 315, a planarization layer 311 and a passivation layer 317 which are arranged in sequence, the first electrode layer 313 includes a first convex portion 3131 arranged on the crest 113 and a first concave portion 3133 arranged on the trough 115, and the first carrier transport layer 315 includes a second convex portion 3151 arranged on the first convex portion 3131 and a second concave portion 3153 arranged on the first concave portion 3133. That is, the first electrode layer 313 is stacked on the light incident surface 11, the first carrier transport layer 315 is stacked on the side of the first electrode layer 313 away from the light incident surface 11, the planarization layer 311 is stacked on the side of the first carrier transport layer 315 away from the first electrode layer 313, and the passivation layer 317 is stacked on the side of the planarization layer 311 away from the first carrier transport layer 315.

[0107] In some embodiments, the photosensitive layer 33 is stacked on a side of the passivation layer 317 away from the planarization layer 311. The passivation layer 317 can reduce surface defects of the photosensitive layer 33 to improve the photoelectric conversion efficiency.

[0108] See also Figure 7 , Figure 7 It is a structural schematic diagram of a laminated battery assembly provided in yet another embodiment of the first aspect of the present application.

[0109] like Figure 7 As shown, the planarization layer 311 is spaced apart from the light incident surface 11 , and the photosensitive layer 33 is stacked with the planarization layer 311 .

[0110] In some embodiments, in the direction away from the first battery cell 1, the first functional layer 31 includes a first electrode layer 313, a first carrier transport layer 315 and a planarization layer 311 arranged in sequence, the first electrode layer 313 includes a first convex portion 3131 arranged on the wave crest 113 and a first concave portion 3133 arranged on the wave trough 115, and the first carrier transport layer 315 includes a second convex portion 3151 arranged on the first convex portion 3131 and a second concave portion 3153 arranged on the first concave portion 3133. That is, the first electrode layer 313 is stacked on the light incident surface 11, the first carrier transport layer 315 is stacked on the side of the first electrode layer 313 away from the light incident surface 11, and the planarization layer 311 is arranged on the side of the first carrier transport layer 315 away from the first electrode layer 313.

[0111] like Figure 3 , Figure 5 , Figure 7 , Figure 8 and Fig. 9 As shown, in some embodiments, the first functional layer 31 includes a planarization layer 311 and a first carrier transport layer 315 , wherein the planarization layer 311 and the first carrier transport layer 315 are adjacently arranged in a direction from the first functional layer 31 to the photosensitive layer 33 .

[0112] In some other embodiments, the first functional layer 31 may further include other layer structures.

[0113] See also Figure 8 , Figure 8 It is a structural schematic diagram of a laminated battery assembly provided in yet another embodiment of the first aspect of the present application.

[0114] like Figure 8 As shown, in some embodiments, the first functional layer 31 includes a planarization layer 311 and a first carrier transport layer 315, and the planarization layer 311 and the first carrier transport layer 315 are an integrally formed structure. The planarization layer 311 and the first carrier transport layer 315 are an integrally formed structure, so that there is no layered structure between the planarization layer 311 and the first carrier transport layer 315, but the material of the planarization layer 311 and the material of the first carrier transport layer 315 are mutually doped to form a structure with good structural integrity, which can serve as the planarization layer 311 and the first carrier transport layer 315, and the planarization layer 311 and the first carrier transport layer 315 are an integrally formed structure, and can also be formed by the fluid formed by mixing the material of the planarization layer 311 and the material of the first carrier transport layer 315 through leveling and curing. In this way, it can be formed through a one-time process and is conducive to reducing the thickness of the first functional layer 31.

[0115] In some embodiments, the first functional layer 31 also includes a first electrode layer 313 disposed on the light incident surface 11, and an integrated structure formed by the planarization layer 311 and the first carrier transport layer 315 is disposed on the side of the first electrode layer 313 away from the light incident surface 11, and the first electrode layer 313 includes a first convex portion 3131 disposed on the crest 113 and a first concave portion 3133 disposed on the trough 115.

[0116] like Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 8 and Fig. 9 As shown, in some embodiments, the conductivity of the planarization layer 311 is not less than the conductivity of the first carrier transport layer 315. This prevents the provision of the planarization layer 311 from reducing the carrier transport performance.

[0117] like Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 8 and Fig. 9 As shown, in some embodiments, in the direction away from the first battery unit 1, the second functional layer 35 includes a second carrier transport layer 351 and a second electrode layer 353 which are stacked in sequence. That is, the second carrier transport layer 351 is stacked on the side of the photosensitive layer 33 away from the first functional layer 31, and the second electrode layer 353 is stacked on the side of the second carrier transport layer 351 away from the photosensitive layer 33.

[0118] In some embodiments, a passivation layer may also be disposed between the second carrier transport layer 351 and the photosensitive layer 33 .

[0119] like Figure 1 , Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, in some embodiments, the first electrode layer 313, the second electrode layer 353, the first carrier transport layer 315 and the second carrier transport layer 351 can be formed by an evaporation process; the planarization layer 311 can be formed by a solution process.

[0120] like Fig. 9 As shown, in some embodiments, the first electrode layer 313, the second electrode layer 353 and the second carrier transport layer 35 can be formed by an evaporation process; the first carrier transport layer 315 and the planarization layer 311 can be formed by a solution process.

[0121] In these embodiments, one of the first carrier transport layer 315 and the second carrier transport layer 351 is a hole transport layer, and the other is an electron transport layer.

[0122] In these embodiments, both the first electrode layer 313 and the second electrode layer 353 have high transmittance to light of 700 nm to 1200 nm.

[0123] Optionally, the transmittance of the first electrode layer 313 and the second electrode layer 353 to light of 700 nm to 1200 nm is not less than 60%.

[0124] Exemplarily, the transmittance of the first electrode layer 313 and the second electrode layer 353 to light of 700nm to 1200nm can be 60%, 63%, 65%, 68%, 70%, 73%, 75%, 78%, 80%, 83%, 85%, 88%, 90%, 93%, 95% or 99%, etc. Of course, the preset transmittance can also be any combination range of the above values.

[0125] In the following embodiments, the first carrier transport layer 315 is an electron transport layer, the second carrier transport layer 351 is a hole transport layer, and accordingly, the first electrode layer 313 is a negative electrode, and the second electrode layer 353 is a positive electrode.

[0126] Optionally, the material of the hole transport layer includes NiO x , but the material of the hole transport layer is not limited to NiO x , for example, it can also be MeOTAD, etc.

[0127] Optionally, the material of the electron transport layer includes SnO2, but the material of the electron transport layer is not limited to SnO2, for example, it can also be TiO2, ZnO, ZnS, PTAA, etc.

[0128] Optionally, the material of the negative electrode includes at least one of ITO, FTO, and AZO, but the material of the negative electrode is not limited to the above materials.

[0129] Optionally, the material of the positive electrode includes at least one of ITO, Ag, Al, and Au; the material of the positive electrode is not limited to the above materials, for example, it can also be Mg, Zn, etc.

[0130] like Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 8 and Fig. 9 As shown, in some embodiments, a cover plate 5 is provided on the side of the second battery unit 3 facing away from the first battery unit 1, and the cover plate 5 is connected to the second battery unit 3 via a first adhesive film 6. The cover plate 5 protects the laminated battery assembly, and the first adhesive film 6 plays a connecting role.

[0131] like Figure 1 , Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, in some embodiments, a substrate 7 is provided on the side of the first battery unit 1 facing away from the second battery unit 3, and the substrate 7 is connected to the first battery unit 1 via a second adhesive film 8. The substrate 7 protects the laminated battery assembly, and the second adhesive film 8 serves as a connection. That is, the laminated battery assembly has a light-incoming side.

[0132] Optionally, the surface of the first battery cell 1 facing away from the second battery cell 3 also has a concave-convex structure 111. On the one hand, the connection strength between the second adhesive film 8 and the first battery cell 1 can be increased, and on the other hand, the surface of the first battery cell 1 facing away from the second battery cell 3 can be avoided from being flattened.

[0133] In some optional embodiments, the light emitted by the light source is directly incident on the laminated battery assembly from the light incident side.

[0134] like Fig. 9 As shown, in some embodiments, the first battery unit 1 has two light incident surfaces 11 arranged opposite to each other, and each light incident surface 11 is provided with a second battery unit 3. The side where the second battery unit 3 is located is used as the light incident side. That is, the laminated battery assembly has two light incident sides.

[0135] In some optional embodiments, part of the light emitted by the light source directly irradiates the laminated cell assembly from one of the light incident sides, and another part of the light is reflected and irradiates the laminated cell assembly from the other light incident side.

[0136] Optionally, the cover plate 5 and the substrate 7 are transparent plates.

[0137] Optionally, the transparent plate includes but is not limited to a glass plate.

[0138] Optionally, the first adhesive film 6 and the second adhesive film 8 are transparent adhesive films.

[0139] Optionally, the transparent adhesive film includes at least one of ethylene-vinyl acetate copolymer (EVA) or polyolefin elastomer (POE).

[0140] In some embodiments, the concavo-convex structure 111 enables the first electrode layer 313 to form a first convex portion 3131 and a first concave portion 3133 and the first carrier transport layer 315 to form a second convex portion 3151 and a second concave portion 3153 .

[0141] See also Figure 7 , Figure 7 It is a step flow chart of a method for preparing a laminated battery assembly provided in an embodiment of the second aspect of the present application.

[0142] like Fig.11 As shown, the method for preparing the laminated battery assembly prepares the laminated battery assembly. The preparation method comprises the following steps:

[0143] Step S1 , providing a first battery unit 1 , wherein the first battery unit 1 has a light incident surface 11 , and the light incident surface 11 has a concave-convex structure 111 .

[0144] Step S2 , preparing a first functional layer 31 on the light incident surface 11 , wherein the first functional layer 31 has a planarization layer 311 , and the planarization layer 311 has a planarization surface 31A on a side away from the light incident surface 11 .

[0145] Step S3 , preparing a photosensitive layer 33 on the side of the first functional layer 31 facing away from the light incident surface 11 .

[0146] Step S4 , preparing a second functional layer 35 on the side of the photosensitive layer 33 facing away from the first functional layer 31 .

[0147] In some embodiments, step S2 includes: forming the planarization layer 311 by a solution process.

[0148] In some embodiments, the solution process includes at least one of slot coating, spin coating, or printing.

[0149] In some embodiments, the first functional layer 31 includes a planarization layer 311 and a first carrier transport layer 315. Before the step of forming the planarization layer 311 by a solution process, the material of the first carrier transport layer 315 and the material of the planarization layer 311 are mixed to form a fluid, so that the first carrier transport layer 315 and the planarization layer 311 form an integrally formed structure.

[0150] The third aspect of the present application also provides a laminated battery, which includes the laminated battery assembly described above, or includes the laminated battery assembly prepared by the above-mentioned preparation method.

[0151] An embodiment of the present application also provides an electrical device, which includes the laminated battery assembly introduced in the above embodiment.

[0152] The application can be implemented in other specific forms without departing from its spirit and essential characteristics. For example, the algorithm described in the specific embodiment can be modified, and the system architecture does not depart from the basic spirit of the application. Therefore, the current embodiment is regarded as exemplary and non-restrictive in all aspects, and the scope of the application is defined by the attached claims rather than the above description, and all changes falling within the meaning of the claims and the scope of equivalents are thereby included in the scope of the application.

Claims

1. A laminated battery assembly, characterized in that: include: A first battery unit having a light incident surface, wherein the light incident surface has a concave-convex structure; The second battery unit includes a first functional layer stacked on the light incident surface, a photosensitive layer stacked on the first functional layer on a side away from the light incident surface, and a second functional layer stacked on the photosensitive layer on a side away from the first functional layer, wherein the first functional layer has a planarization layer, and the planarization layer has a planarization surface away from the light incident surface.

2. The laminated battery assembly according to claim 1, characterized in that: The photosensitive layer includes a perovskite material; Preferably, the first battery cell is a crystalline silicon battery cell; Preferably, the second battery cell is a perovskite battery cell.

3. The laminated battery assembly according to claim 1, characterized in that: The planarization layer has a preset transmittance for light in a first wavelength band, and the planarization layer is conductive; Preferably, the first wavelength band ranges from 700 nm to 1200 nm. Preferably, the preset transmittance is not less than 60%; Preferably, the planarization layer is formed by leveling and curing a fluid; Preferably, the material of the planarization layer includes at least one of graphene, polycarbonate doped material, polymer of 3,4-ethylenedioxythiophene monomer, sodium polystyrene sulfonate doped material or delafossite film material; Preferably, the concavo-convex structure comprises crests and troughs, and the height difference between the crests and the troughs is not greater than the thickness of the planarization layer; Preferably, the thickness of the planarization layer is 0.5 μm to 2 μm.

4. The laminated battery assembly according to claim 1, characterized in that: The planarization layer is stacked on the light incident surface; Preferably, in a direction away from the first battery unit, the first functional layer includes the planarization layer, the first electrode layer and the first carrier transport layer which are arranged in sequence.

5. The laminated battery assembly according to claim 1, characterized in that: The planarization layer is spaced apart from the light incident surface and the photosensitive layer; Preferably, in a direction away from the first battery unit, the first functional layer includes a first electrode layer, the planarization layer and a first carrier transport layer which are sequentially arranged, the concave-convex structure includes crests and troughs, and the first electrode layer includes a first convex portion arranged on the crests and a first concave portion arranged on the troughs; Alternatively, in a direction away from the first battery cell, the first functional layer includes a first electrode layer, a first carrier transport layer, the planarization layer and a passivation layer arranged in sequence, the concave-convex structure includes crests and troughs, the first electrode layer includes a first convex portion arranged on the crest and a first concave portion arranged on the trough, and the first carrier transport layer includes a second convex portion arranged on the first convex portion and a second concave portion arranged on the first concave portion.

6. The laminated battery assembly according to claim 1, characterized in that: The planarization layer is spaced apart from the light incident surface, and the photosensitive layer is stacked with the planarization layer; Preferably, in the direction away from the first battery cell, the first functional layer includes a first electrode layer, a first carrier transport layer and the planarization layer arranged in sequence, the concave-convex structure includes crests and troughs, the first electrode layer includes a first convex portion arranged on the crest and a first concave portion arranged on the trough, and the first carrier transport layer includes a second convex portion arranged on the first convex portion and a second concave portion arranged on the first concave portion.

7. The laminated battery assembly according to claim 1, characterized in that: The first functional layer includes the planarization layer and a first carrier transport layer; The planarization layer and the first carrier transport layer are arranged adjacent to each other in a direction from the first functional layer to the photosensitive layer; or The planarization layer and the first carrier transport layer are an integrally formed structure; Preferably, the conductivity of the planarization layer is not less than the conductivity of the first carrier transport layer.

8. The laminated battery assembly according to claim 1, characterized in that: In a direction away from the first battery unit, the second functional layer includes a second carrier transport layer and a second electrode layer stacked in sequence; Preferably, a cover plate is provided on a side of the second battery unit facing away from the first battery unit, and the cover plate is connected to the second battery unit via a first adhesive film; Preferably, a substrate is provided on a side of the first battery unit facing away from the second battery unit, and the substrate is connected to the first battery unit via a second adhesive film; Preferably, the first battery unit has two light incident surfaces that are arranged opposite to each other, and the second battery unit is disposed on each of the light incident surfaces.

9. A method for preparing a laminated battery assembly, characterized in that: The following steps are involved: Providing a first battery unit, wherein the first battery unit has a light incident surface, and the light incident surface has a concave-convex structure; Preparing a first functional layer on the light incident surface, wherein the first functional layer has a planarization layer, and the planarization layer has a planarization surface facing away from the light incident surface; Prepare a photosensitive layer on the side of the first functional layer facing away from the light incident surface; A second functional layer is provided on the side of the photoactive layer facing away from the first functional layer.

10. The method for preparing a laminated battery assembly according to claim 9, characterized in that: The step of preparing the first functional layer on the light incident surface comprises: forming the planarization layer by a solution process; Preferably, the solution process comprises at least one of slit coating, spin coating or printing; Preferably, the first functional layer includes the planarization layer and a first carrier transport layer, and before the step of forming the planarization layer by a solution process, the material of the first carrier transport layer and the material of the planarization layer are mixed to form a fluid.

11. A laminated battery, characterized in that: A laminated battery assembly comprising any one of claims 1-8, or a laminated battery assembly prepared by the preparation method of any one of claims 9-10.

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