Perovskite battery and preparation method thereof

Abstract

The invention discloses a perovskite battery and a preparation method thereof, and belongs to the technical field of perovskite batteries. The perovskite battery comprises a packaging substrate, a transparent substrate and battery units, any group of battery units at least comprises a front electrode, a functional layer and a back electrode which are sequentially arranged on one side of the transparent substrate in a stacked mode, and any two adjacent groups of battery units are connected in series through a metal auxiliary layer arranged on the packaging substrate. The series connection is realized, the resistance between the back electrode and the front electrode can be reduced, the damage of water vapor to the battery is effectively prevented, and the conversion efficiency of the battery device is improved. Besides, the metal auxiliary layer is prepared on the packaging substrate of the battery device, so that the damage to the film layer caused by directly preparing the metal auxiliary layer on the film layer of the battery unit can be reduced, the metal auxiliary layer and the battery unit can be prepared at the same time, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of perovskite cells, and in particular to a perovskite cell and a preparation method thereof. Background Art

[0002] With the increasing demand for energy and the continuous development of perovskite battery technology, the technology of applying perovskite batteries to display modules (such as wearable electronic products) and using the principle of light-to-electricity conversion to power the display modules has been increasingly widely used. At present, solar energy is rarely used in wearable, low-power and other power-consuming products, and the manufacturing process is cumbersome. In addition, since wearable electronic products are not only used outdoors or in strong light environments, but more often indoors or in low light environments, how to improve the photoelectric conversion efficiency in low light environments has become one of the technical problems that need to be solved in perovskite battery manufacturing technology. Summary of the invention

[0003] The main purpose of the present invention is to provide a perovskite cell and a preparation method thereof, so as to solve the technical problem that the photoelectric conversion efficiency of the tandem structure perovskite cell is poor.

[0004] To achieve the above object, the present invention provides a perovskite battery, which is arranged on the display surface side of the display module, and the perovskite battery includes a packaging substrate, a transparent substrate and at least two groups of battery cells, and any group of battery cells at least includes a front electrode, a functional layer and a back electrode stacked in sequence on one side of the transparent substrate, and any group of battery cells is defined as a first battery cell, and any group of battery cells adjacent to the first battery cell is defined as a second battery cell;

[0005] One side of the transparent substrate includes the first battery unit and the second battery unit;

[0006] The first battery unit at least includes a first front electrode, a first functional layer and a first back electrode stacked in sequence on one side of the transparent substrate, and the first functional layer at least includes a first perovskite light absorption layer;

[0007] The second battery unit at least includes a second front electrode, a second functional layer and a second back electrode stacked in sequence on one side of the transparent substrate, and the second function at least includes a second perovskite light absorbing layer;

[0008] A metal auxiliary layer is provided on a surface of the packaging substrate facing the transparent substrate, and the first back electrode and the second front electrode are connected through the metal auxiliary layer so that the first battery unit and the second battery unit form a series structure;

[0009] The packaging substrate and the transparent substrate enclose and seal the first battery cell and the second battery cell.

[0010] In some embodiments, in the same group of the battery cells, the back electrode and the functional layer are insulated and separated from the metal auxiliary layer connected to the front electrode; and / or, in the same group of the battery cells, the metal auxiliary layer connected to the back electrode and the metal auxiliary layer connected to the front electrode are insulated and separated.

[0011] In some embodiments, the metal auxiliary layer includes a first metal auxiliary layer and a second metal auxiliary layer that are in contact with each other, and the first metal auxiliary layer and the second metal auxiliary layer are both arranged on the surface of the packaging substrate facing the transparent substrate. The first metal auxiliary layer serves as the negative electrode of the first battery unit, and the second metal auxiliary layer serves as the positive electrode of the second battery unit.

[0012] In some embodiments, the first metal auxiliary layer and the second metal auxiliary layer have the same thickness, and the second metal auxiliary layer serves as the positive electrode of the second battery cell and is connected to the second front electrode through a conductive layer.

[0013] In some embodiments, the conductive layer includes a conductive paste, and the second metal auxiliary layer serving as the positive electrode of the second battery cell is connected to the second front electrode through the conductive paste.

[0014] In some embodiments, the second back electrode further contacts a third metal auxiliary layer, the third metal auxiliary layer serves as a negative electrode extending from the second battery unit, and the third metal auxiliary layer is insulated and separated from the second front electrode.

[0015] In some embodiments, the packaging substrate includes at least one of glass and a flexible film.

[0016] The present invention also provides a method for preparing the perovskite battery as described above, comprising the following steps:

[0017] Providing a packaging substrate, preparing a metal auxiliary layer on a surface of the packaging substrate facing the transparent substrate, the metal auxiliary layer comprising a first metal auxiliary layer and a second metal auxiliary layer having the same thickness and in contact with each other;

[0018] Providing a transparent substrate, and preparing a first front electrode and a second front electrode on a surface of the transparent substrate facing the display module;

[0019] Forming a first functional layer on the surface of the first front electrode, and forming a second functional layer on the surface of the second front electrode;

[0020] A first back electrode is formed on the surface of the first functional layer to form a first battery unit, and a second back electrode is formed on the surface of the second front functional layer to form a second battery unit;

[0021] preparing an insulating layer to cover and insulate the second back electrode and the second functional layer;

[0022] preparing a conductive layer on the surface of the second front electrode;

[0023] The side of the transparent substrate facing the display module is correspondingly laminated to the side of the package substrate provided with the metal auxiliary layer, so that the first metal auxiliary layer is in contact with and connected to the first back electrode, the second metal auxiliary layer is electrically connected to the second front electrode through the conductive layer, and the second back electrode and the second functional layer are both separated and insulated from the second metal auxiliary layer by the insulating layer;

[0024] The transparent substrate and the encapsulation substrate are sealed.

[0025] In some embodiments, the method of preparing the metal auxiliary layer includes magnetron sputtering or printing.

[0026] In some embodiments, a conductive paste is coated on a surface of the second front electrode to prepare the conductive layer, and the conductive paste includes at least one of a carbon paste and a hydrophobic conductive material.

[0027] The beneficial effects that can be achieved by the present invention are:

[0028] The present invention connects any two battery cells to form a series structure through a metal auxiliary layer. The metal auxiliary layer not only plays a role in series connection, but also can reduce the resistance between the back electrode and the front electrode, which can effectively improve the conversion efficiency of the battery device. By utilizing this rule, two or more battery cells can be connected in series, increasing the capacity of the battery device and effectively reducing its path resistance, greatly improving the conversion efficiency.

[0029] In addition, the present invention prepares the metal auxiliary layer on the packaging substrate of the battery device. Compared with preparing the metal auxiliary layer directly on the surface of the battery cell, it can reduce the damage to other film layers of the battery cell such as the back electrode, front electrode, perovskite light absorption layer, electron transport layer, hole transport layer, etc. during the preparation of the metal auxiliary layer, and the metal auxiliary layer and the battery cell can be prepared at the same time, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the structure of four groups of battery cells of a perovskite battery according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of four groups of battery cells of a perovskite battery according to another embodiment of the present invention.

[0033] Figure 3 It is a schematic diagram of the series structure of two adjacent groups of battery cells according to an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the series structure of two adjacent groups of battery cells according to another embodiment of the present invention.

[0035] Figure 5 It is a partial structural schematic diagram of a perovskite cell provided with a via insulating layer according to an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the series structure of two adjacent groups of battery cells according to another embodiment of the present invention.

[0037] Reference Numbers

[0038] Battery Cell 100 Transparent substrate 200 First battery cell 10 Second battery unit 20 First front electrode 11 The second front electrode 21 The first functional layer 12 Second functional layer 22 The first back electrode 13 The second back electrode 23 Via insulation layer 14 Metal auxiliary layer 30 First metal auxiliary layer 31 Second metal auxiliary layer 32 The third metal auxiliary layer 33 Insulation layer 40

[0039] The purpose, features and advantages will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0040] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their 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 addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present invention provides a perovskite battery, which is arranged on the display surface side of the display module, and the perovskite battery includes a packaging substrate, a transparent substrate 200 and a battery unit 100, and the battery unit 100 includes at least a front electrode, a functional layer and a back electrode stacked in sequence on one side of the transparent substrate 200;

[0044] Define any group of the battery cells as a first battery cell 10, and any group of battery cells adjacent to the first battery cell 10 as a second battery cell 20;

[0045] One side of the transparent substrate 200 includes the first battery unit 10 and the second battery unit 20;

[0046] The first battery unit 10 at least includes a first front electrode 11, a first functional layer 12 and a first back electrode 13 which are sequentially stacked on one side of the transparent substrate 200, and the first functional layer 12 at least includes a first perovskite light absorption layer;

[0047] The second battery unit 20 at least includes a second front electrode 21, a second functional layer 22 and a second back electrode 23 stacked in sequence on one side of the transparent substrate 200, and the second function at least includes a second perovskite light absorbing layer;

[0048] A metal auxiliary layer 30 is provided on a surface of the encapsulation substrate facing the transparent substrate 200, and the first back electrode 13 and the second front electrode 21 are connected through the metal auxiliary layer 30 so that the first battery unit 10 and the second battery unit 20 form a series structure;

[0049] The packaging substrate and the transparent substrate 200 are bonded and sealed to the first battery cell 10 and the second battery cell 20 .

[0050] The present invention connects any two battery cells 100 to form a series structure through the metal auxiliary layer 30. The metal auxiliary layer 30 not only reduces the resistance between the back electrode and the front electrode, but also effectively improves the conversion efficiency of the battery device. By utilizing this rule, two or more battery cells 100 can be connected in series to increase the capacity of the battery device and effectively reduce its path resistance, thereby greatly improving the conversion efficiency.

[0051] The present invention does not specifically limit the shape of the display module, which may be circular, square or any other shape.

[0052] In some embodiments, the display module includes a middle display area and a peripheral frame area. Figure 1 , Figure 1 is a schematic diagram of the structure of four battery cells 100 that have not yet been covered with a metal auxiliary layer. Figure 1 The inner circle of is the display area of ​​the display module. Figure 1The negative electrode area and the positive electrode area in the display module serve as the outer frame area. The series structure of the perovskite battery of the present invention mainly corresponds to the frame area setting of the display module. Of course, the perovskite battery can also be set in the display area of ​​the display module, but the setting of the perovskite battery will affect the display effect of the display module, that is, it will affect the transmittance of the display module. Therefore, the perovskite battery set in the display area is generally in the shape of spaced grid bars, which are invisible to the naked eye to prevent the perovskite battery from affecting the display effect of the display module. Therefore, the photoelectric conversion efficiency of the perovskite battery in the display area is much lower than that of the frame area.

[0053] In some embodiments, the series structure of the perovskite cells can completely cover the border area of ​​the display module to improve the photoelectric conversion efficiency of the perovskite cells without affecting the display effect of the display module. Figure 1 , Figure 1 The series structure of 4 groups of battery cells is shown. It should be noted that the number of 4 groups is only used as an example and is not limited thereto. It can also be 2, 3, 5, 6, 7, 8, etc. In this embodiment, each group of battery cells includes a positive electrode (+) and a negative electrode (-). The negative electrode of one group of battery cells (equivalent to the back electrode of the first battery cell 10) extends to the positive electrode of another group of battery cells adjacent to the battery cell (equivalent to the front electrode of the second battery cell 20) to form an electrical connection in series.

[0054] In some embodiments, the functional layer between the back electrode and the front electrode in the battery cell 100 includes a film layer commonly used in the art, such as an electron transport layer, a perovskite light absorption layer, and a hole transport layer.

[0055] In the present invention, reference is made to Figure 2 , Figure 2 A top view of four battery cells 100 covered with a metal auxiliary layer 30 according to an embodiment is shown. For easy observation, Figure 2 The packaging substrate on the metal auxiliary layer 30 is omitted, and the back electrodes of one group of battery cells and the front electrodes of the other group of battery cells in any two adjacent groups of battery cells 100 are connected in series through the metal auxiliary layer.

[0056] Therefore, in some embodiments, reference Figure 2 and Figure 3 , Figure 3 A three-dimensional diagram of two groups of adjacent battery cells 100 covered with a metal auxiliary layer 30 according to another embodiment is shown. For easy observation, Figure 3 The packaging substrate on the metal auxiliary layer 30 is omitted. In the same battery cell group, the back electrode and the functional layer are insulated and separated from the metal auxiliary layer 30 connected to the front electrode, so that the problem of short circuit caused by the positive and negative electrodes being connected in the same battery cell group can be avoided.

[0057] In other embodiments, reference Figure 2 and Figure 5 , Figure 5 This is a schematic diagram of the series structure of any two groups of battery cells 100 in an embodiment. When the front electrode and the back electrode of the same group of battery cells 100 are both connected with a metal auxiliary layer 30, the metal auxiliary layer 30 connected to the back electrode and the metal auxiliary layer 30 connected to the front electrode are insulated and separated. This can avoid the problem of short circuit caused by the connection between the positive and negative electrodes in the same group of battery cells.

[0058] In some embodiments, reference Figure 3 and Figure 4 , Figure 3 and Figure 4 All of them are schematic diagrams of the series structure of any two groups of battery cells in an embodiment, the metal auxiliary layer 30 includes a first metal auxiliary layer 31 and a second metal auxiliary layer 32 that are in contact with each other, and the first metal auxiliary layer 31 and the second metal auxiliary layer 32 are both arranged on the surface of the packaging substrate facing the transparent substrate 200, but, Figure 3 and Figure 4 For ease of observation, the packaging substrate on the surface of the metal auxiliary layer 30 is omitted. In this embodiment, the first metal auxiliary layer 31 is connected to the first back electrode 13 of the first battery cell 10, and the second metal auxiliary layer 32 is connected to the second front electrode 21 of the second battery cell 20, so that the series connection of the two groups of battery cells is realized. In this embodiment, a first functional layer 12 is provided between the first metal auxiliary layer 31 and the first front electrode 11 of the first battery cell 10, and the first functional layer 12 includes conventional functional film layers in the art, including an electron transport layer, a hole transport layer, a perovskite active layer, etc. Similarly, a second functional layer 22 is also provided between the second metal auxiliary layer 32 and the second front electrode 21 of the second battery cell 20, and the second functional layer 22 includes conventional functional film layers in the art, including an electron transport layer, a hole transport layer, a perovskite active layer, etc.

[0059] In the present invention, the metal auxiliary layer is provided on the packaging substrate. When the packaging substrate and the substrate provided with the battery cell are bonded and sealed, the metal auxiliary layer covers the back electrode surface of the battery cell, which may damage the back electrode. Therefore, in some embodiments, referring to Figure 5 The surface of the back electrode is also provided with a via insulating layer 14, and the via holes of the via insulating layer 14 are filled with a conductive paste, and the metal auxiliary layer and the back electrode can be connected through the conductive paste in the via holes of the via insulating layer 14. In this embodiment, the via insulating layer 14 plays a certain buffering role on the back electrode.

[0060] Exemplarily, when the metal auxiliary layer includes a first metal auxiliary layer 31 and a second metal auxiliary layer 32 that are in contact with each other, the first metal auxiliary layer 31 is connected to the first back electrode 13 of the first battery cell 10, and the second metal auxiliary layer 32 is connected to the second front electrode 21 of the second battery cell 20, then a via insulating layer 14 is provided between the first metal auxiliary layer 31 and the first back electrode 13 of the first battery cell 10, and the via holes of the via insulating layer 14 are filled with conductive paste, and the first metal auxiliary layer 31 and the first back electrode 13 are connected through the conductive paste.

[0061] In some embodiments, the conductive paste includes a carbon paste and / or a hydrophobic material.

[0062] In the battery cell, a functional layer is provided between the back electrode and the front electrode. The functional layer generally includes a perovskite light absorbing layer, an electron transport layer, and a hole transport layer. Therefore, there is a height difference between the back electrode and the front electrode. In some embodiments, continue to refer to Figure 3 When the first metal auxiliary layer 31 is connected to the first back electrode 13, and the second metal auxiliary layer 32 is connected to the second front electrode 21, the thicknesses of the first metal auxiliary layer 31 and the second metal auxiliary layer 32 in the direction perpendicular to the surface of the packaging substrate are different. Specifically, the thickness of the second metal auxiliary layer 32 is greater than the thickness of the first metal auxiliary layer 31. The thickness difference formed between the first metal auxiliary layer 31 and the second metal auxiliary layer 32 is equal to the height difference formed between the second back electrode 23 and the second front electrode 21, that is, the thickness of the functional layer.

[0063] In some embodiments, reference Figure 4 , the first metal auxiliary layer 31 and the second metal auxiliary layer 32 have the same thickness, the first metal auxiliary layer 31 is in contact with the first back electrode 13 of the first battery unit 10, and the second metal auxiliary layer 32 is connected to the second front electrode 21 of the second battery unit 20 through the conductive layer. In this embodiment, by setting a conductive layer to fill the height difference formed between the second back electrode 23 and the second front electrode 21, the metal auxiliary layers of each part can have the same thickness, and the metal auxiliary layer is provided on the surface of the package substrate. Therefore, when the first metal auxiliary layer 31 and the second metal auxiliary layer 32 have the same thickness, the shapes of the first metal auxiliary layer 31 and the second metal auxiliary layer 32 can be designed in advance, and the preparation of the first metal layer and the second metal auxiliary layer 32 can be completed simultaneously on the surface of the metal auxiliary layer, which simplifies the process and improves production efficiency.

[0064] In the present invention, the conductive layer has an electrical connection function, and its preparation material includes a conductive paste. For example, the conductive paste may be coated only on the surface of the second front electrode 21 to form the conductive layer.

[0065] In some embodiments, the conductive layer may also include insulating materials. In this embodiment, the conductive layer is made of insulating materials as a whole, and one or more vias are provided, the vias are connected to the second front electrode 21, and the conductive paste is filled in the vias. When the second metal auxiliary layer 32 covers and contacts the upper surface of the conductive layer, the second metal auxiliary layer 32 can be electrically connected to the second front electrode 21 through the conductive paste in the vias, and the conductive layer also has an insulating effect, which can achieve insulation separation between the second metal auxiliary layer 32 and the second back electrode 23 and the second functional layer 22. Therefore, the battery cell with the conductive layer of this embodiment does not need to set an additional insulating layer between the metal auxiliary layer connected to the front electrode and the back electrode and the functional layer.

[0066] In some embodiments, reference Figure 2 and Figure 6 The second back electrode 23 is further in contact with a third metal auxiliary layer 33, and the third metal auxiliary layer 33 is insulated and separated from the first metal auxiliary layer 31 and the second front electrode 21. In this embodiment, Figure 3 or Figure 4 The design of the second battery cell 20 shown can also add a third battery cell, and define the front electrode and the back electrode of the third battery cell as a third front electrode and a third back electrode respectively. The third front electrode of the third battery cell is connected with a fourth metal auxiliary layer. The third metal auxiliary layer 33 of the second battery cell 20 and the fourth metal auxiliary layer of the third battery cell are in contact with each other to realize the series connection of the second battery cell 20 and the third battery cell, thereby realizing the series connection of three groups of battery cells, and so on. In this way, the series connection of four, five, six, seven, eight or more groups of battery cells can be further realized.

[0067] In some embodiments, the functional layer between the back electrode and the front electrode of the perovskite cell of the series structure includes a common film layer in the art, such as a perovskite light absorption layer, an electron transport layer, etc. Exemplarily, any group of battery cells at least includes a front electrode, an electron transport layer, a perovskite light absorption layer, a perovskite light absorption layer, a hole transport layer and a back electrode stacked sequentially on one side of the transparent substrate 200, or at least includes a front electrode, a hole transport layer, a perovskite light absorption layer, an electron transport layer and a back electrode sequentially arranged on one side of the transparent substrate 200.

[0068] In some embodiments, the encapsulation substrate includes at least one of glass and a flexible film.

[0069] The present invention also provides a method for preparing a perovskite battery, comprising the following steps:

[0070] S10, providing a packaging substrate, and preparing a metal auxiliary layer on a surface of the packaging substrate facing the transparent substrate 200, wherein the metal auxiliary layer includes a first metal auxiliary layer 31 and a second metal auxiliary layer 32 that are in contact with each other;

[0071] S20, providing a transparent substrate 200, and preparing a first front electrode 11 and a second front electrode 21 on a surface of the transparent substrate 200 facing the encapsulation substrate;

[0072] S30, forming a first functional layer 12 on the surface of the first front electrode 11, and forming a second functional layer 22 on the surface of the second front electrode 21;

[0073] S40, preparing a first back electrode 13 on the surface of the first functional layer 12 to form a first battery unit 10, and preparing a second back electrode 23 on the surface of the second functional layer 22 to form a second battery unit 20;

[0074] S50, insulating the second back electrode 23, the second functional layer 22 and part of the second front electrode 21 to form an insulating layer;

[0075] S60, a layer of conductive paste is prepared on the surface of the second front electrode 21 that is not covered with insulation to form a conductive layer, and the side of the transparent substrate 200 provided with the first front electrode 11 and the second front electrode 21 is correspondingly laminated to the side of the packaging substrate provided with the metal auxiliary layer, so that the first metal auxiliary layer 31 is in contact with the first back electrode 13, the second metal auxiliary layer 32 is electrically connected to the second front electrode 21 through the conductive layer, and the second back electrode 23 and the second functional layer 22 are separated and insulated from the second metal auxiliary layer 32 by the insulating layer;

[0076] S70 , sealing the transparent substrate 200 and the packaging substrate.

[0077] It should be noted that step S10 and steps S20 to S60 can be performed simultaneously, that is, the metal auxiliary layer and the battery unit can be prepared at the same time, which is conducive to improving production efficiency.

[0078] In the present invention, the first metal auxiliary layer 31 and the second metal auxiliary layer 32 of step S10 are in contact and connected. After the packaging substrate and the transparent substrate 200 are correspondingly bonded, the first metal auxiliary layer 31 and the first back electrode 13 of the first battery cell 10 are in contact and connected, and the second metal auxiliary layer 32 and the second front electrode 21 of the second battery cell 20 are in contact and connected, so that the first battery cell 10 and the second battery cell 20 are electrically connected to form a series structure.

[0079] In step S60, because a layer of conductive paste is prepared on the surface of the second front electrode 21 that is not covered with insulation to form a conductive layer, the gap between the second metal auxiliary layer 32 and the second front electrode 21 can be filled. Therefore, in step S10, the first metal auxiliary layer 31 and the second metal auxiliary layer 32 have the same thickness, and the shape of the required metal auxiliary layer can be designed in advance on the surface of the packaging substrate, and then the first metal auxiliary layer 31 and the second metal auxiliary layer 32 are prepared at the same time, which can improve production efficiency. In addition, preparing the metal auxiliary layer on the packaging substrate of the battery device can reduce the damage to the functional layers of the battery cell such as the back electrode, the front electrode, the perovskite light absorption layer, the electron transport layer, the hole transport layer, etc. during the preparation of the metal auxiliary layer, compared with preparing the metal auxiliary layer directly on the surface of the battery cell.

[0080] In some embodiments of step S10, the method for preparing the metal auxiliary layer includes magnetron sputtering or printing. For example, the shape of the required metal auxiliary layer is designed on the surface of the packaging substrate, and then the first metal auxiliary layer 31 and the second metal auxiliary layer 32 are prepared simultaneously by magnetron sputtering or printing to improve production efficiency.

[0081] In some embodiments, the material used to prepare the metal auxiliary layer includes a metal material.

[0082] In the present invention, the front electrode of step S20 can be prepared by selecting materials and preparation methods commonly used in the art.

[0083] In the present invention, the first functional layer 12 and the second functional layer 22 may include some common film layers constituting perovskite cells in the art, such as an electron transport layer, a perovskite light absorption layer, and a hole transport layer. The above common film layers in the art can be prepared using conventional technical means in the art.

[0084] In step S30 , the second functional layer 22 does not completely cover the second front electrode 21 , and a partial area is reserved to prepare the conductive layer in step S60 , so that the second metal auxiliary layer 32 can be connected to the second front electrode 21 through the conductive layer.

[0085] In the present invention, the first back electrode 13 and the second back electrode 23 may be prepared by using materials and preparation methods commonly used in the art.

[0086] In the present invention, after the preparation of the first back electrode 13 and the second back electrode 23 is completed, a via insulation layer 14 can also be prepared on the surface of the first back electrode 13, and the via holes of the via insulation layer 14 are filled with conductive paste, so that after the sealing treatment of step S70 is completed, the first metal auxiliary layer 31 and the via insulation layer 14 are connected through the conductive paste in the via holes.

[0087] In the present invention, the purpose of preparing the insulating layer in step S50 is to insulate and separate the two functional layers 22, the second back electrode 23 and the second metal auxiliary layer 32. Because the first metal auxiliary layer 31 and the second metal auxiliary layer 32 are in contact and connected, if the second metal auxiliary layer 32 is in contact and connected with the second back electrode 23 and / or the two functional layers 22, it is easy to cause the front electrode and the back electrode of the first battery cell 10 to be directly connected and cause a short circuit.

[0088] In step S50, the preparation material of the insulating layer includes organic materials and inorganic non-metallic materials, the organic materials include organic resins and polyimide (PI), and the inorganic non-metallic materials include at least one of silicon dioxide (SiO2) and silicon nitride (SiNx). The above insulating materials have good insulation effects and can reduce the corrosion of water and oxygen on battery components.

[0089] In step S50, the insulating layer may completely cover the second functional layer 22 and the second back electrode 23. In another embodiment, the second functional layer 22 and the second back electrode 23 may also be partially covered, and the side facing the conductive layer and / or the second metal auxiliary layer 32 may be covered and insulated to prevent the second metal auxiliary layer 32 from directly contacting the second functional layer 22 or the second back electrode 23, thereby preventing the first metal auxiliary layer 31 as a negative electrode and the second back electrode 23 as a negative electrode from directly forming a path to cause a short circuit.

[0090] In the present invention, the conductive layer of step S60 can fill the gap formed between the second metal auxiliary layer 32 and the second front electrode 21 due to insufficient thickness, and the second metal auxiliary layer 32 needs to be electrically connected to the second front electrode 21 to achieve the series connection of two groups of battery cells. Therefore, the conductive layer of the present invention includes a conductive paste, so that the second metal auxiliary layer 32 can be electrically connected to the second front electrode 21 through the conductive paste.

[0091] In some embodiments, the conductive layer includes a conductive paste, and the conductive paste can be directly coated on the surface of the second front electrode 21 to form the conductive layer. The conductive layer has a high content of the conductive paste, which is beneficial to improving the transmission efficiency of electrons.

[0092] In some embodiments, the conductive paste includes at least one of a carbon paste and a hydrophobic conductive material. The above materials have certain fluidity and plasticity. When coated on the surface of the second front electrode 21, when the transparent substrate 200 and the packaging substrate are correspondingly bonded, the gap formed between the second metal auxiliary layer 32 and the second front electrode 21 can be well filled, and the connection between the second metal auxiliary layer 32 and the second front electrode 21 can be strengthened. It can also play a role in isolating water vapor, which can well reduce the problem of poor connection caused by thickness difference.

[0093] In some embodiments, the conductive layer may also include an insulating material. The conductive layer is formed with the insulating material on the surface of the second front electrode 21, and at the same time, one or more vias are formed in the conductive layer. The vias expose a portion of the second front electrode 21, and a conductive paste is filled in the vias so that the conductive paste is in direct contact with the second front electrode 21. When the second metal auxiliary layer 32 covers the surface of the conductive layer, the second metal auxiliary layer 32 is in direct contact with the conductive paste in the via, thereby achieving electrical connection between the second metal auxiliary layer 32 and the second front electrode 21, and completing the series connection of the first battery cell 10 and the second battery cell 20.

[0094] In some embodiments, the insulating material includes an organic material and an inorganic non-metallic material, the organic material includes an organic resin and polyimide (PI), and the inorganic non-metallic material includes at least one of silicon dioxide (SiO2) and silicon nitride (SiNx). The above insulating materials can reduce the corrosion of water and oxygen on the battery components.

[0095] In step S70 , sealing the transparent substrate 200 and the encapsulation substrate can reduce the corrosion of water and oxygen to the battery cells.

[0096] In some embodiments, before the transparent substrate 200 and the packaging substrate are bonded together, a layer of sealant is printed on the periphery of the battery cell of the transparent substrate 200, and then the transparent substrate 200 and the packaging substrate are bonded together. The sealant will be filled between the transparent substrate 200 and the packaging substrate, and then the sealant is cured by heating to complete the sealing. The sealing effect is good, which is beneficial to greatly enhance the resistance of the perovskite battery to water and oxygen corrosion.

[0097] In some embodiments, after applying the above-mentioned glass glue and frame glue, before bonding, a laser is focused on the glass glue, and the laser is used to melt the glass glue and the frame glue. After bonding, the melted glass glue and the frame glue can better seal the transparent substrate 200 and the packaging substrate.

[0098] In some embodiments, the sealant includes a UV light cure.

[0099] In some embodiments, the output power of the laser is less than 100 W, and the laser wavelength is maintained at 700 nm to 1000 nm, such as 700 nm, 800 nm, 900 nm or 1000 nm.

[0100] In some embodiments, after completing step S80, the packaging glass of the perovskite battery can also be chemically etched to be thinned to 0.4 mm or less, and then physically polished. The purpose of chemical etching is to minimize the weight of the battery in the electronic product and meet the lightweight requirements of the electronic product.

[0101] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A perovskite battery, arranged on a display surface side of a display module, characterized in that: The perovskite battery comprises a packaging substrate, a transparent substrate and a battery unit, wherein the battery unit comprises at least a front electrode, a functional layer and a back electrode sequentially stacked on one side of the transparent substrate; Define any group of the battery cells as a first battery cell, and any group of battery cells adjacent to the first battery cells as a second battery cell; One side of the transparent substrate includes the first battery unit and the second battery unit; The first battery unit at least includes a first front electrode, a first functional layer and a first back electrode stacked in sequence on one side of the transparent substrate, and the first functional layer at least includes a first perovskite light absorption layer; The second battery unit at least includes a second front electrode, a second functional layer and a second back electrode stacked in sequence on one side of the transparent substrate, and the second functional layer at least includes a second perovskite light absorbing layer; A metal auxiliary layer is provided on a surface of the packaging substrate facing the transparent substrate, and the first back electrode and the second front electrode are connected through the metal auxiliary layer so that the first battery unit and the second battery unit form a series structure; The packaging substrate and the transparent substrate are bonded to seal the first battery cell and the second battery cell.

2. The perovskite battery according to claim 1, characterized in that: In the same group of battery cells, the back electrode and the functional layer are insulated and separated from the metal auxiliary layer connected to the front electrode; And / or, in the same group of the battery cells, the metal auxiliary layer connected to the back electrode and the metal auxiliary layer connected to the front electrode are insulated and separated.

3. The perovskite battery according to claim 1 or 2, characterized in that: The metal auxiliary layer includes a first metal auxiliary layer and a second metal auxiliary layer which are in contact with each other. The first metal auxiliary layer and the second metal auxiliary layer are both arranged on the surface of the packaging substrate facing the transparent substrate. The first metal auxiliary layer is connected to the first back electrode of the first battery cell, and the second metal auxiliary layer is connected to the second front electrode of the second battery cell.

4. The perovskite battery according to claim 3, characterized in that: A via insulating layer is provided between the first metal auxiliary layer and the first back electrode of the first battery cell, via holes of the via insulating layer are filled with conductive paste, and the first metal auxiliary layer and the first back electrode are connected through the conductive paste.

5. The perovskite battery according to claim 4, characterized in that: The conductive paste includes carbon paste and / or hydrophobic material.

6. The perovskite battery according to claim 3, characterized in that: The thicknesses of the first metal auxiliary layer and the second metal auxiliary layer are different; Alternatively, the first metal auxiliary layer and the second metal auxiliary layer have the same thickness, and the second metal auxiliary layer and the second front electrode of the second battery cell are connected via a conductive layer.

7. The perovskite battery according to claim 6, characterized in that: The first metal auxiliary layer and the second metal auxiliary layer have the same thickness, the conductive layer includes a conductive paste, and the second metal auxiliary layer and the second front electrode in the second battery cell are connected through the conductive paste.

8. The perovskite battery according to any one of claims 3 to 7, characterized in that: The second back electrode further contacts a third metal auxiliary layer, and the third metal auxiliary layer is insulated and separated from the second metal auxiliary layer and the conductive paste.

9. The perovskite battery according to claim 1, characterized in that: The packaging substrate includes at least one of glass and a flexible film.

10. A method for preparing a perovskite battery according to any one of claims 1 to 9, characterized in that: The following steps are involved: Providing a packaging substrate, preparing a metal auxiliary layer on a surface of the packaging substrate facing the transparent substrate, the metal auxiliary layer comprising a first metal auxiliary layer and a second metal auxiliary layer in contact with each other; Providing a transparent substrate, and preparing a first front electrode and a second front electrode on a surface of the transparent substrate facing the encapsulation substrate; Forming a first functional layer on the surface of the first front electrode, and forming a second functional layer on the surface of the second front electrode; A first back electrode is formed on the surface of the first functional layer to form a first battery unit, and a second back electrode is formed on the surface of the second functional layer to form a second battery unit; Insulating the second back electrode, the second functional layer and a portion of the second front electrode to form an insulating layer; A layer of conductive paste is prepared on the surface of the second front electrode that is not covered with insulation to form a conductive layer, and the side of the transparent substrate provided with the first front electrode and the second front electrode is correspondingly laminated to the side of the packaging substrate provided with the metal auxiliary layer, so that the first metal auxiliary layer is in contact with and connected to the first back electrode, the second metal auxiliary layer is electrically connected to the second front electrode through the conductive layer, and the second back electrode and the second functional layer are both separated and insulated from the second metal auxiliary layer by the insulating layer; The transparent substrate and the encapsulation substrate are sealed.

11. The method for preparing a perovskite battery according to claim 10, characterized in that: A via insulating layer is prepared on the surface of the first back electrode away from the first front electrode, and a conductive paste is filled in the via holes of the via insulating layer, so that the first metal auxiliary layer is in contact with the first back electrode through the conductive paste.

12. The method for preparing a perovskite battery according to claim 9, characterized in that: Before sealing the transparent substrate and the packaging substrate, a sealing insulating layer is prepared around the conductive layer.

13. The method for preparing a perovskite battery according to claim 10, characterized in that: The method for preparing the metal auxiliary layer includes magnetron sputtering, evaporation or printing; and / or, the conductive paste includes metal paste.

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