Coating system, coating method, perovskite solar cell, preparation method and electrical device

Abstract

Disclosed in the present application are a coating system, a coating method, a perovskite solar cell, a preparation method and an electrical device. The coating system comprises: a substrate carrying device, a slurry supply device and a current loading device, wherein the substrate carrying device is configured to carry a substrate to be coated; the slurry supply device is configured to apply slurry to said substrate, and the slurry supply device comprises an accommodating cavity for accommodating the slurry; and the current loading device is electrically connected to said substrate, or is electrically connected to the accommodating cavity of the slurry supply device. In this way, the current loading device loads a current to the slurry, such that a contact angle between the slurry and said substrate can be reduced by means of the current, the wettability of the slurry penetrating said substrate can be improved, and a coating effect can be improved. In addition, compared with using high-voltage electrode plates to generate static charges, loading the current to the slurry by means of the current loading device can improve the wettability of the slurry penetrating said substrate at a low voltage, which is more conducive to industrial applications.

Description

Coating system, coating method, perovskite cell, preparation method and electric device

[0001] [According to Rule 91 correction 28.11.2025] This application claims priority to Chinese Patent Application No. 202411320689.6, filed on September 20, 2024, and entitled "Coating system, coating method, perovskite cell, preparation method and electric device", which is incorporated by reference in its entirety.

TECHNICAL FIELD

[0002] The present application relates to the technical field of solar cells, in particular to a coating system, a coating method, a perovskite cell, a preparation method and an electric device.

BACKGROUND

[0003] As the third generation of solar cells, perovskite solar cells use perovskite materials as light-absorbing layer materials, and have significant performance advantages such as high light absorption coefficient, carrier mobility, direct and controllable optical bandgap, etc.

[0004] Generally, perovskite solar cells are prepared by using a coating device. In the coating process, slurry needs to be applied to the substrate to be coated, so that the slurry can infiltrate the substrate to be coated to prepare at least one layer in the perovskite solar cell. However, the slurry applied to the substrate to be coated has poor wettability.

SUMMARY

[0005] The main purpose of the present application is to provide a coating system, a coating method, a perovskite cell, a preparation method and an electric device, which aims to solve the above technical problems existing in the prior art.

[0006] To solve the above problems, the present application provides a coating system, which comprises a substrate carrying device, a slurry supply device and a current loading device. The substrate carrying device is used to carry the substrate to be coated. The slurry supply device is used to apply slurry to the substrate to be coated. The slurry supply device comprises a containing cavity containing the slurry. The current loading device is electrically connected to the substrate to be coated or the containing cavity of the slurry supply device. In this way, the current loading device is electrically connected to the substrate to be coated or the containing cavity of the slurry supply device to load current to the slurry. The contact angle between the slurry and the substrate to be coated can be reduced by the current, the wettability of the slurry penetrating into the substrate to be coated can be improved, and the coating effect can be improved. Compared with generating static electricity by using a high-voltage electrode plate, the wettability of the slurry penetrating into the substrate to be coated can be improved by loading current to the slurry by the current loading device in a low-voltage manner, which is more conducive to industrial application.

[0007] In some embodiments, the current loading device comprises a first electrode assembly and a second electrode assembly, and the first electrode assembly and the second electrode assembly are electrically connected to the substrate to be coated at the same time or electrically connected to the accommodating cavity of the slurry supply device at the same time. In this way, the first electrode assembly and the second electrode assembly indirectly contact the slurry through the substrate to be coated or are directly connected to the accommodating cavity to directly contact the slurry, which is conducive to loading current to the slurry and more conducive to improving the stability of current loading and improving the wettability of the slurry penetrating into the substrate to be coated.

[0008] In some embodiments, the current loading device is arranged on the substrate carrying device, and the first electrode assembly and the second electrode assembly are electrically connected to the substrate to be coated during the coating process. In this way, the current loading device is arranged on the substrate carrying device, which is conducive to fixing the current loading device and reducing the interference of the first electrode assembly and the second electrode assembly with the slurry supply device. At the same time, the first electrode assembly and the second electrode assembly are electrically connected to the substrate to be coated, which is conducive to loading current to the slurry through the substrate to be coated by the first electrode assembly and the second electrode assembly and to improving the stability of current loading.

[0009] In some embodiments, the coating system further comprises a transmission member connected to the first electrode assembly and the second electrode assembly for driving the first electrode assembly and the second electrode assembly to contact the substrate to be coated. In this way, the first electrode assembly and the second electrode assembly are driven to contact the substrate to be coated by the transmission member, which can facilitate taking and placing the substrate to be coated and loading or canceling current to the substrate to be coated to load or cancel current to the slurry, thereby improving the wettability of the slurry penetrating into the substrate to be coated.

[0010] In some embodiments, the first electrode assembly and the second electrode assembly are arranged at intervals along the substrate to be coated. In this way, the first electrode assembly and the second electrode assembly are arranged at intervals along the substrate to be coated, which can facilitate loading current to the slurry through the substrate to be coated and improve the wettability of the slurry penetrating into the substrate to be coated.

[0011] In some embodiments, the first electrode assembly and / or the second electrode assembly comprises a plurality of electrode contacts. In this way, the first electrode assembly and / or the second electrode assembly comprises a plurality of electrode contacts, which can be in contact with the substrate to be coated at the same time through the plurality of electrode contacts, thereby improving the uniformity of applied current and the diffusion area of current and improving the uniformity of the substrate to be coated being penetrated by the slurry.

[0012] In some embodiments, the plurality of electrode contacts are arranged at non-equidistant intervals, or the current loading device comprises a voltage adjustment circuit connected to the plurality of electrode contacts. In this way, the electrode contacts are arranged at non-equidistant intervals or the voltage adjustment circuit is connected to the plurality of electrode contacts, which can facilitate applying different sizes of current corresponding to the size of the amount of slurry at different positions, thereby improving the wettability while also improving the uniformity of the slurry penetration.

[0013] To solve the above problems, the present application provides a coating method, the coating method comprising: placing a substrate to be coated on a substrate support device; loading a current to the substrate to be coated or a slurry used for coating; applying the slurry to the substrate to be coated; and coating the slurry on the substrate to be coated. In this way, the current loading device loads a current to the substrate to be coated or the slurry used for coating, which can reduce the contact angle between the slurry and the substrate to be coated by the current, improve the wettability of the slurry penetrating into the substrate to be coated, and improve the coating effect. Moreover, compared with generating static electricity by using a high-voltage electrode plate, the current loading device loads a current to the slurry in a low-voltage manner, which is more conducive to industrial application.

[0014] In some embodiments, the loading of the current to the substrate to be coated or the slurry used for coating comprises: loading the current to the substrate to be coated, and conducting the current to the slurry applied on the substrate to be coated by the substrate to be coated; or directly loading the current to the slurry. In this way, the loading of the current to the substrate to be coated, and conducting the current to the slurry applied on the substrate to be coated by the substrate to be coated; or directly loading the current to the slurry, which can reduce the contact angle between the slurry and the substrate to be coated by the current, improve the wettability of the slurry penetrating into the substrate to be coated, and improve the coating effect.

[0015] In some embodiments, the coating method further comprises: adjusting the intensity of the loaded current based on the amount of the slurry applied on the substrate to be coated. In this way, the adjustment of the intensity of the loaded current based on the amount of the slurry applied on the substrate to be coated, which can improve the wettability and the uniformity of the slurry wettability.

[0016] To solve the above problems, the present application provides a preparation method of a perovskite battery, the preparation method comprising: providing a first electrode; preparing a first carrier transport layer on the first electrode; preparing a perovskite layer on the first carrier transport layer; wherein the perovskite layer is prepared by the coating method as described above; preparing a second carrier transport layer on the perovskite layer; and preparing a second electrode on the second carrier transport layer to obtain the perovskite battery. The first carrier transport layer comprises one of a hole transport layer or an electron transport layer, and the second carrier transport layer comprises the other of the hole transport layer or the electron transport layer.

[0017] To solve the above problems, the present application provides a perovskite battery, which is prepared by the preparation method of the perovskite battery as described above.

[0018] To solve the above problems, the present application provides an electric device, which comprises the perovskite battery as described above. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Fig. 1 is a first structural schematic diagram of a coating system according to one or more embodiments of the present application;

[0021] Fig. 2 is a first state diagram of a second structure of the coating system according to one or more embodiments of the present application;

[0022] Fig. 3 is a top structural schematic diagram of the coating system shown in Fig. 2;

[0023] Fig. 4 is a second state diagram of the second structure of the coating system according to one or more embodiments of the present application;

[0024] Fig. 5 is a top structural schematic diagram of the coating system shown in Fig. 4;

[0025] Fig. 6 is a first structural schematic diagram of a plurality of electrode contacts arranged in an electrode transmission assembly in the coating system according to one or more embodiments of the present application;

[0026] Fig. 7 is a second structural schematic diagram of a plurality of electrode contacts arranged in an electrode transmission assembly in the coating system according to one or more embodiments of the present application;

[0027] Fig. 8 is a third structural schematic diagram of the coating system according to one or more embodiments of the present application;

[0028] Fig. 9 is a side structural schematic diagram of the coating system shown in Fig. 8;

[0029] Fig. 10 is a fourth structural schematic diagram of the coating system according to one or more embodiments of the present application;

[0030] Fig. 11 is a top structural schematic diagram of the coating system shown in Fig. 10;

[0031] Fig. 12 is a fifth structural schematic diagram of the coating system according to one or more embodiments of the present application;

[0032] Fig. 13 is a flow schematic diagram of a coating method according to one or more embodiments of the present application;

[0033] Fig. 14 is a flow schematic diagram of a preparation method of a perovskite battery according to one or more embodiments of the present application;

[0034] Fig. 15 is a structural schematic diagram of an embodiment of a perovskite battery provided according to the present application.

[0035] Reference signs: coating system 10; substrate carrier 100; slurry supply 200; coating head 210; containing cavity 220; current loading device 300; first electrode assembly 310; electrode contact 311; second electrode assembly 320; power supply 330; voltage regulating circuit 340; slurry 400; substrate to be coated 500; transmission member 600. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "comprise" and variations thereof, as used in the specification and in the claims and the aforementioned summary, are intended to cover a non-exclusive inclusion.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0039] In this paper, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] With the development of society, energy has become the focus of the current problem. The gradual depletion of traditional non-renewable energy, the harm to the environment and the ozone layer during use, has become a key problem restricting the continued development of human society. In the past few decades, the field of solar cells has been considered one of the most promising options to replace traditional fossil fuels. Among the many photovoltaic devices, the photoelectric conversion efficiency of perovskite solar cells has achieved the fastest development in recent years.

[0045] In the preparation process of a solar cell, a coating process is usually used. In the coating process, a slurry needs to be applied to a to-be-coated substrate, and then the slurry needs to be infiltrated into the to-be-coated substrate, so as to prepare at least one layer in the solar cell. However, the slurry applied to the to-be-coated substrate in the related art has poor wettability when the slurry penetrates into the to-be-coated substrate.

[0046] To solve the technical problems in the related art, the present application provides a coating system, a coating method, a perovskite battery, a preparation method and an electric device. By loading current on the slurry for coating to charge the slurry, the contact angle between the slurry and the to-be-coated substrate is reduced by the current, the wettability of the slurry penetrating into the to-be-coated substrate is improved, and the coating effect is improved.

[0047] Specifically, referring to FIG. 1, FIG. 1 is a first structural schematic diagram of a coating system according to one or more embodiments of the present application.

[0048] The coating system 10 comprises a substrate carrying device 100 for carrying a substrate 500 to be coated, a slurry supplying device 200 for applying a slurry 400 to the substrate 500 to be coated, and a current loading device 300 for loading the slurry 400 with current.

[0049] The substrate 500 to be coated can include, but is not limited to, conductive glass, such as the substrate 500 to be coated which can have an electrode layer attached to the surface of a glass substrate, or the substrate 500 to be coated which has an electrode layer and a hole transport layer stacked on the surface of a glass substrate, etc. Further, the substrate 500 to be coated can also include a conductive flexible substrate, such as the substrate 500 to be coated which can have an electrode layer attached to the surface of a flexible substrate, or the substrate 500 to be coated which has an electrode layer and a hole transport layer stacked on the surface of a flexible substrate, etc., wherein the material of the flexible substrate includes, but is not limited to, polyvinyl alcohol (PVA), polyester (PET), polyimide (PI), poly naphthalene dimethyl glycol ester (PEN), polydimethylsiloxane (PDMS), etc. The slurry 400 can be a mixture solution, such as dissolving relevant materials (at least one of iodomethanimine, lead iodide, bromomethylamine, iodomethylamine, cesium iodide, lead bromide, etc.) in a solvent (dimethylformamide (DMF), dimethyl sulfoxide (DMSO), or N-methyl pyrrolidone (NMP), etc.), stirring uniformly, and then filtering to obtain the slurry 400.

[0050] The substrate 500 to be coated can be in the form of a solid plate or a flexible plate, and the substrate carrying device 100 can have a fixing structure for fixing the substrate 500 to be coated, and the substrate 500 to be coated is fixed by the substrate carrying device 100. The substrate carrying device 100 can be used to drive the substrate 500 to be coated to rotate or to translate. The slurry supplying device 200 can be arranged opposite and spaced apart from the substrate carrying device 100, such as the substrate carrying device 100 being located downstream of the slurry supplying device 200 in the direction of gravity, and when the substrate 500 to be coated is located on the substrate carrying device 100, the substrate 500 to be coated and the slurry supplying device 200 are arranged opposite to each other, and the slurry supplying device 200 can guide the slurry 400 to the substrate 500 to be coated, and the slurry 400 can be applied to the substrate 500 to be coated under the action of its own gravity.

[0051] The current loading device 300 can load the slurry 400 with current. The current loading device 300 can be in direct contact with the slurry 400, so that the current loading device 300 directly loads the slurry 400 with current, or the current loading device 300 can be indirectly in contact with the slurry 400 through other conductors, so that the current loading device 300 indirectly loads the slurry 400 with current through the other conductors.

[0052] In the case that the slurry 400 is applied on the substrate 500 to be coated and the current loading device 300 loads current to the slurry 400, the contact electro-wetting effect (CEW effect) is triggered, the current causes charge transfer to spontaneously cause the change of wettability of the substrate 500 to be coated, to reduce the contact angle of the slurry 400 and the substrate, to improve the wettability of the slurry 400 penetrating into the substrate 500 to be coated, and to reduce other conditions that can affect the wettability, such as reducing the wettability time of the substrate 500 to be coated, reducing the ambient temperature of the substrate 500 to be coated, reducing the solution concentration of the slurry 400, and the like.

[0053] Through the above-mentioned embodiments, the current loading device 300 loads current to the slurry 400, which can reduce the contact angle of the slurry 400 and the substrate, improve the wettability of the slurry 400 penetrating into the substrate 500 to be coated, and improve the coating effect. Compared with generating static electricity by using a high-voltage electrode plate, the current loading device 300 loads current to the slurry 400 in a low-voltage manner, which is more conducive to industrial application.

[0054] Further, the slurry supply device 200 includes a containing cavity 220 containing the slurry 210, and the current loading device 300 is electrically connected with the substrate 500 to be coated or the containing cavity 220 of the slurry supply device 200.

[0055] The current loading device 300 can directly load current to the slurry 400, or can be electrically connected with the substrate 500 to be coated, and then transmit the current to the slurry 400 applied on the substrate 500 to be coated after the substrate 500 to be coated is charged. The electrical connection with the substrate 500 to be coated can be direct contact or can be arranged on the substrate carrying device 100 to conduct the current to the substrate 500 to be coated through the substrate carrying device 100.

[0056] The containing cavity 220 is used to contain the slurry 210, and the containing cavity 220 can be in communication with the slurry outlet of the slurry supply device 200, so that the slurry 210 in the containing cavity 220 is applied on the substrate 500 to be coated through the slurry outlet. The current loading device 300 can also be electrically connected with the containing cavity 220 of the slurry supply device 200, and the slurry 400 contained therein is charged through the containing cavity 220. Similarly, the containing cavity 220 can be directly or indirectly charged, and then the current is conducted to the slurry 400, or the current can be directly loaded in the containing cavity 220 to charge the slurry 400. The specific arrangement position and form of the current loading device 300 are not limited, as long as the current can be loaded to the substrate 500 to be coated or the slurry 400.

[0057] It can be understood that the high-speed ejection process of the slurry 500 has little effect on the speed of the slurry 400 ejection or the application of the slurry 400 after the application, either by conducting the current on the to-be-coated substrate 500 to the slurry 400 applied thereon, or by charging the slurry 400 after being accommodated in the accommodation cavity 220 and then applying the slurry 400 to the to-be-coated substrate 500, which can ensure the coating effect. On the other hand, since the perovskite battery has a thin coating film layer, the charging of the slurry 400 by conducting the current on the to-be-coated substrate 500 to the slurry 400 applied thereon can ensure that the slurry 400 is more uniformly charged, thereby fully improving the contact angle between the slurry 400 and the to-be-coated substrate 500, and making the coating effect better.

[0058] In some other embodiments, the current loading device 300 can also be in direct contact with the slurry 400 in other ways, so as to directly load the current to the slurry 400 through the current loading device 300, for example, the slurry 400 loading device has a conveying path for conveying the slurry 400, the conveying path is communicated with the accommodation cavity 220 and the slurry outlet of the slurry supply device 200, and the current loading device 300 is electrically connected with the slurry on the conveying path, so as to directly load the current to the slurry 400 through the current loading device 300. Or the current loading device 300 is partially located at the slurry outlet, and the slurry 400 flowing out of the slurry outlet passes through the electrode part of the current loading device 300, so as to directly load the current to the slurry 400 through the current loading device 300.

[0059] In some embodiments, the current loading device 300 includes a first electrode assembly 310 and a second electrode assembly 320, and the first electrode assembly 310 and the second electrode assembly 320 are simultaneously electrically connected with the to-be-coated substrate 500 or are simultaneously electrically connected with the accommodation cavity 220 of the slurry supply device 200.

[0060] The first electrode assembly 310 and the second electrode assembly 320 can be fixed to the substrate support device 100; or one of the first electrode assembly 310 and the second electrode assembly 320 can be fixed to the slurry supply device 200; or one of the first electrode assembly 310 and the second electrode assembly 320 is fixed to the slurry supply device 200 and the other is fixed to the substrate support device 100; or the first electrode assembly 310 and the second electrode assembly 320 are suspended; or one of the first electrode assembly 310 and the second electrode assembly 320 is suspended and the other is connected to the slurry supply device 200 or the substrate support device 100. The first electrode assembly 310 and the second electrode assembly 320 can each include one or more electrodes, for example, one of the first electrode assembly 310 and the second electrode assembly 320 includes a positive electrode and the other includes a negative electrode. The current loading device 300 can further include a power supply 330, which can be connected to the substrate support device 100 or the slurry supply device 200. The power supply 330 can be electrically connected to the first electrode assembly 310 and the second electrode assembly 320 respectively through wires.

[0061] The first electrode assembly 310 and the second electrode assembly 320 are in direct or indirect contact with the slurry 400 to enable the first electrode assembly 310 and the second electrode assembly 320 to directly or indirectly load the slurry 400 with electric current. Among others, the first electrode assembly 310 and / or the second electrode assembly 320 can be in direct contact with the slurry 400 so that the first electrode assembly 310 and / or the second electrode assembly 320 directly loads the slurry 400 with electric current, for example, the slurry supply device 200 can have a receiving cavity 220 to receive the slurry 400, the first electrode assembly 310 and / or the second electrode assembly 320 directly extends into the receiving cavity 220 and makes the first electrode assembly 310 and / or the second electrode assembly 320 in direct contact with the slurry 400 therein so that the first electrode assembly 310 and / or the second electrode assembly 320 directly loads the slurry 400 with electric current. The first electrode assembly 310 and / or the second electrode assembly 320 can also be electrically connected with the receiving cavity 220 to conduct electric current through the receiving cavity 220 to the slurry 400 received therein. Alternatively, the slurry 400 loading device has a slurry 400 conveying path to convey the slurry 400, the first electrode assembly 310 and / or the second electrode assembly 320 is located on the slurry 400 conveying path to make the first electrode assembly 310 and / or the second electrode assembly 320 in direct contact with the slurry 400 on the slurry 400 conveying path to directly load the slurry 400 with electric current through the first electrode assembly 310 and / or the second electrode assembly 320. Alternatively, the slurry 400 loading device has a slurry 400 output port to output the slurry 400, the first electrode assembly 310 and / or the second electrode assembly 320 is located at the slurry 400 output port, the slurry 400 flowing out of the slurry 400 output port passes through the first electrode assembly 310 and / or the second electrode assembly 320 to make the first electrode assembly 310 and / or the second electrode assembly 320 in direct contact with the slurry 400 on the slurry 400 conveying path to directly load the slurry 400 with electric current through the first electrode assembly 310 and / or the second electrode assembly 320.

[0062] Alternatively, the first electrode assembly 310 and / or the second electrode assembly 320 can be indirectly in contact with the paste 400 through other conductors, so that the first electrode assembly 310 and / or the second electrode assembly 320 indirectly load the current to the paste 400 through the other conductors. For example, the first electrode assembly 310 and / or the second electrode assembly 320 is in contact with the to-be-coated substrate 500, which is an electrically conductive structure, and when the paste 400 is applied on the to-be-coated substrate 500, the first electrode assembly 310 and / or the second electrode assembly 320 is indirectly in contact with the paste 400 through the to-be-coated substrate 500, so as to indirectly load the current to the paste 400 through the first electrode assembly 310 and / or the second electrode assembly 320. Alternatively, the first electrode assembly 310 and / or the second electrode assembly 320 is in contact with the conductor part of the paste supply device 200, and at the same time, the paste 400 is also in contact with the conductor part of the paste supply device 200, so that the first electrode assembly 310 and / or the second electrode assembly 320 is indirectly in contact with the paste 400 through the conductor part of the paste supply device 200, so as to indirectly load the current to the paste 400 through the other conductors. Alternatively, the first electrode assembly 310 and / or the second electrode assembly 320 is in contact with the conductor part of the substrate carrying device 100, and at the same time, the to-be-coated substrate 500 is an electrically conductive structure, and the to-be-coated substrate 500 is also in contact with the conductor part of the substrate carrying device 100, and when the paste 400 is applied on the to-be-coated substrate 500, the first electrode assembly 310 and / or the second electrode assembly 320 is indirectly in contact with the paste 400 through the conductor part of the substrate carrying device 100 and the to-be-coated substrate 500, so that the current loading device 300 indirectly loads the current to the paste 400.

[0063] When the first electrode assembly 310 and the second electrode assembly 320 are directly in contact with the paste 400, the first electrode assembly 310, the second electrode assembly 320 and the paste 400 together form a current loop, so that the current is directly loaded to the paste 400 through the first electrode assembly 310 and the second electrode assembly 320. When the first electrode assembly 310 and the second electrode assembly 320 are indirectly in contact with the paste 400 through other conductors, the first electrode assembly 310, the second electrode assembly 320, the other conductors and the paste 400 together form a current loop, so that the current is indirectly loaded to the paste 400 through the first electrode assembly 310, the second electrode assembly 320 and the other conductors. Therefore, the first electrode assembly 310 and the second electrode assembly 320 are directly or indirectly in contact with the paste 400, respectively, which is conducive to loading the current to the paste 400, and more conducive to improving the stability of the current loading and improving the wettability of the paste 400 penetrating into the to-be-coated substrate 500.

[0064] Referring to FIG. 2 and FIG. 3, FIG. 2 is a first state diagram of a second structure of the coating system 10 according to one or more embodiments of the present application; and FIG. 3 is a top structural schematic diagram of the coating system 10 shown in FIG. 2.

[0065] The current loading device 300 is arranged on the substrate carrying device 100, and the first electrode assembly 310 and the second electrode assembly 320 are electrically connected with the substrate to be coated 500 in the coating process. Exemplarily, the power supply 330 of the current loading device 300 can be directly fixedly installed on the substrate carrying device 100, such as the power supply 330 can be embedded inside the substrate carrying device 100, or the power supply 330 is carried on the surface of the substrate carrying device 100. The first electrode assembly 310 and the second electrode assembly 320 can be indirectly installed on the substrate carrying device 100 through other components, or the first electrode assembly 310 and the second electrode assembly 320 can be directly carried on the substrate carrying device 100.

[0066] The coating process can be understood as a process in which the slurry supply device 200 applies the slurry 400 to the substrate to be coated 500. In the coating process, the first electrode assembly 310 and the second electrode assembly 320 are electrically connected with the substrate to be coated 500, that is, after the slurry 400 is applied to the substrate to be coated 500, the first electrode assembly 310, the second electrode assembly 320, the substrate to be coated 500, the slurry 400 and the power supply 330 collectively form a current loop, thereby enabling the power supply 330 to indirectly load current to the slurry 400 through the first electrode assembly 310, the second electrode assembly 320 and the substrate to be coated 500. In other embodiments, in the coating process, the first electrode assembly 310 and the second electrode assembly 320 can be electrically connected with the substrate carrying device 100, and the substrate carrying device 100 is electrically connected with the substrate to be coated 500, so that the power supply 330 indirectly loads current to the slurry 400 through the first electrode assembly 310, the second electrode assembly 320, the substrate carrying device 100 and the substrate to be coated 500. The way in which the first electrode assembly 310 and the second electrode assembly 320 are electrically connected with the substrate to be coated 500 can include but is not limited to direct contact between the first electrode assembly 310 and the second electrode assembly 320 and the substrate to be coated 500.

[0067] Therefore, the current loading device 300 is arranged on the substrate carrying device 100, which is conducive to fixing the current loading device 300 and reducing the interference of the first electrode assembly 310 and the second electrode assembly 320 with the slurry supply device 200. At the same time, the first electrode assembly 310 and the second electrode assembly 320 are electrically connected with the substrate to be coated 500, which is conducive to the first electrode assembly 310 and the second electrode assembly 320 loading current to the slurry 400 through the substrate to be coated 500, and is conducive to improving the stability of current loading.

[0068] FIG. 4 is a second state diagram of a second structure of the coating system 10 according to one or more embodiments of the present application; and FIG. 5 is a top view of the coating system 10 shown in FIG. 4.

[0069] The coating system 10 further comprises a transmission member 600 connected with the first electrode assembly 310 and the second electrode assembly 320 for driving the first electrode assembly 310 and the second electrode assembly 320 to contact the substrate 500 to be coated.

[0070] The transmission member 600 can be drivingly or fixedly connected with the substrate carrier 100, or the transmission member 600 and the substrate carrier 100 are provided separately. The transmission member 600 can be fixedly connected with the first electrode assembly 310 and the second electrode assembly 320, and the transmission member 600 can drive the first electrode assembly 310 and the second electrode assembly 320 to move in a two-dimensional space or a three-dimensional space, so as to adjust the first electrode assembly 310 to contact or move away from the substrate 500 to be coated, and adjust the second electrode assembly 320 to contact or move away from the substrate 500 to be coated.

[0071] As shown in FIGS. 2-5, the transmission member 600 can be two, one transmission member 600 corresponding to the first electrode assembly 310, and the other transmission member 600 corresponding to the second electrode assembly 320. The transmission member 600 corresponding to the first electrode assembly 310 is used to drive the first electrode assembly 310 to move close to or away from the substrate 500 to be coated, and the transmission member 600 corresponding to the second electrode assembly 320 is used to drive the second electrode assembly 320 to move close to or away from the substrate 500 to be coated.

[0072] As shown in FIGS. 2-5, taking one transmission member 600 driving the first electrode assembly 310 as an example, the transmission member 600 can drive the first electrode assembly 310 to switch between the first position and the second position, in the first position, the first electrode assembly 310 is located within the to-be-coated surface of the to-be-coated substrate 500 along the projection in the direction perpendicular to the to-be-coated surface of the to-be-coated substrate 500, in the second position, the first electrode assembly 310 is located outside the to-be-coated surface of the to-be-coated substrate 500 along the projection in the direction perpendicular to the to-be-coated surface of the to-be-coated substrate 500, and the transmission member 600 can also be used to drive the first electrode assembly 310 to contact or move away from the to-be-coated substrate 500 along the direction perpendicular to the to-be-coated surface of the to-be-coated substrate 500 when the first electrode assembly 310 is in the first position. Similarly, the other transmission member 600 driving the second electrode assembly 320 can be the same as or similar to the way the transmission member 600 drives the first electrode assembly 310, which will not be repeated here. In the structural diagrams shown in FIGS. 2 and 3, the first electrode assembly 310 and the second electrode assembly 320 are both in the first position and in contact with the to-be-coated substrate 500, and in the structural diagrams shown in FIGS. 4 and 5, the first electrode assembly 310 and the second electrode assembly 320 are both in the second position.

[0073] In some embodiments, taking one transmission member 600 driving the first electrode assembly 310 as an example, the transmission member 600 can include a two-part structure, for example, one transmission member 600 includes a first transmission part (such as the longitudinal rod-shaped part of the transmission member 600 in FIG. 2) and a second transmission part (such as the transverse rod-shaped part of the transmission member 600 in FIG. 2), the first transmission part drives the first electrode assembly 310 to switch between the first position and the second position, and the second transmission part is used to drive the first electrode assembly 310 to contact or move away from the to-be-coated substrate 500 when the first electrode assembly 310 is in the first position, wherein the second transmission part can drive the first electrode assembly 310 to contact or move away from the to-be-coated substrate 500 along the direction perpendicular to the to-be-coated surface of the to-be-coated substrate 500. Similarly, the other transmission member 600 driving the second electrode assembly 320 can be the same as or similar to the way the transmission member 600 drives the first electrode assembly 310, which will not be repeated here.

[0074] The first transmission part can be carried on the substrate carrying device 100 and can be rotatably connected with the substrate carrying device 100, the second transmission part can be fixedly connected with the first transmission part, and the first electrode assembly 310 is connected with the first transmission part, so that the first electrode assembly 310 can be switched between the first position and the second position by rotating the first transmission part to drive the second transmission part. Alternatively, the first transmission part can be carried on the substrate carrying device 100 and can be fixedly connected with the substrate carrying device 100, the second transmission part can be rotatably connected with the first transmission part, and the first electrode assembly 310 is connected with the first transmission part, so that the first electrode assembly 310 can be switched between the first position and the second position by rotating the second transmission part relative to the first transmission part to drive the second transmission part. In some embodiments, the first transmission part can have a telescopic function, so that the first electrode assembly 310 can be brought into contact with or away from the substrate to be coated 500 by telescoping the first transmission part. Alternatively, the second transmission part can have a moving part, and the first electrode assembly 310 is connected with the moving part, and the moving part can drive the first electrode assembly 310 to move, so that the first electrode assembly 310 can be brought into contact with or away from the substrate to be coated 500. Similarly, the other transmission part 600 can drive the second electrode assembly 320 in the same or similar way as the transmission part 600 drives the first electrode assembly 310, which will not be described here. Thus, by driving the first electrode assembly 310 and the second electrode assembly 320 to contact the substrate to be coated 500 by the transmission part 600, it is convenient to take and place the substrate to be coated 500, and it is convenient to load or cancel the current to the paste 400 by loading or canceling the current to the substrate to be coated 500, which improves the wettability of the paste 400 penetrating into the substrate to be coated 500.

[0075] The transmission part 600 can be internally embedded with a wire, which can be arranged to extend inside the transmission part 600, so that the power supply 330 of the current loading device 300 can be electrically connected with the first electrode assembly 310 and the second electrode assembly 320 through the wire, which can simplify the wiring between the first electrode assembly 310 and the power supply 330 and between the second electrode assembly 320 and the power supply 330, and relieve the interference of the too complex wire harness on the paste supply device 200.

[0076] Further, the first electrode assembly 310 and the second electrode assembly 320 are arranged at intervals along the substrate to be coated 500. The first electrode assembly 310 and the second electrode assembly 320 can contact any two different positions of the substrate to be coated 500, which can easily form a current on the substrate to be coated 500 and reduce the interference of the first electrode assembly 310 and the second electrode assembly 320 on the paste supply device 200.

[0077] The positions of the first electrode assembly 310 and the second electrode assembly 320 can form an avoidance with the slurry supply device 200. Exemplarily, the slurry supply device 200 has a supply head, the supply head can be located upstream of the substrate to be coated 500 in the direction of gravity, the supply head can apply the slurry 400 to the substrate to be coated 500, and in the direction of gravity, the projection of the supply head on the substrate to be coated 500 can be located between the first electrode assembly 310 and the second electrode assembly 320, so that the slurry 400 produced from the supply head can enter the substrate to be coated 500 between the first electrode assembly 310 and the second electrode assembly 320 under the influence of its own gravity. Thus, the supply head is used to apply the slurry 400 to the substrate to be coated 500 located between the first electrode assembly 310 and the second electrode assembly 320, which can alleviate the interference of the first electrode assembly 310 and the second electrode assembly 320 with the slurry supply device 200. In another possible embodiment, the first electrode assembly 310 and the second electrode assembly 320 can be located on the same side of the projection of the supply head on the substrate to be coated 500, and the supply head can move on the same side of the first electrode assembly 310 and the second electrode assembly 320.

[0078] The slurry supply device 200 further has a supply head transmission assembly, which is configured to drive the supply head to move relative to the substrate to be coated 500. The supply head transmission assembly can be fixedly connected with the supply head, and can drive the supply head to move in a two-dimensional or three-dimensional space, so as to adjust the position of the supply head corresponding to the substrate to be coated 500 in the direction of gravity and / or adjust the distance between the supply head and the substrate to be coated 500 in the direction of gravity, so that the supply head can apply the slurry 400 to different positions of the substrate to be coated 500. The first electrode assembly 310 and the second electrode assembly 320 remain stationary during the movement of the supply head, which can facilitate more comprehensive application of the slurry 400 to the substrate to be coated 500 and improve the coating efficiency.

[0079] Further, as shown in FIG. 2 and FIG. 3, the supply head transmission assembly is arranged to drive the supply head along the first interval direction between the first electrode assembly 310 and the second electrode assembly 320 or the vertical direction of the first interval direction. That is, when the supply head transmission assembly drives the supply head along the first interval direction, the position of the supply head corresponding to the to-be-coated substrate 500 can be changed; when the supply head transmission assembly drives the supply head along the vertical direction, the interval between the supply head and the to-be-coated substrate 500 in the vertical direction can be changed. Wherein, the supply head transmission assembly can be fixedly connected with the supply head, so as to drive the supply head to move through the supply head transmission assembly. Exemplarily, as shown in FIG. 2, the supply head transmission assembly can be arranged on the substrate carrying device 100. Specifically, the supply head transmission assembly can include two support bases, a translation gantry and a lifting support. The two support bases are arranged to extend along the first interval direction, and are located on both sides of the to-be-coated substrate 500. The two support bases are fixedly connected with the substrate carrying device 100. The translation gantry is slidingly connected with the two support bases, so that the translation gantry can move relative to the two support bases along the first interval direction. The lifting support is fixedly connected with the translation gantry, and the lifting support can move relative to the translation gantry along the vertical direction. The supply head is fixedly connected with the lifting support, so that the translation gantry can drive the supply head to move along the first interval direction, and the lifting support can drive the supply head to move along the vertical direction. In this way, the to-be-coated substrate 500 can be more comprehensively applied with the slurry 400, and the coating efficiency is further improved.

[0080] Further, the first electrode assembly 310 and / or the second electrode assembly 320 includes a plurality of electrode contacts 311. The plurality of electrode contacts 311 can be connected in series or in parallel with the power source 330 to achieve a conductive connection, and when the plurality of electrode contacts 311 are in contact with the substrate 500 to be coated at the same time, the plurality of electrode contacts 311 can be used to load the substrate 500 to be coated with current at the same time. As shown in FIG. 2, taking the plurality of electrode contacts 311 of the first electrode assembly 310 as an example, the plurality of electrode contacts 311 can be arranged in a linear arrangement, for example, the plurality of electrode contacts 311 can be arranged in a linear arrangement along a direction perpendicular to the movement direction of the supply head of the slurry supply device 200, wherein the plurality of electrode contacts 311 of the first electrode assembly 310 can be arranged at equal intervals or at unequal intervals. In other embodiments, the plurality of electrode contacts 311 can also be arranged in other ways, for example, the plurality of electrode contacts 311 can be arranged in an array of multiple rows and multiple columns. Similarly, when the second electrode assembly 320 includes a plurality of electrode contacts 311, the plurality of electrode contacts 311 of the second electrode assembly 320 can be arranged in the same or similar manner as the plurality of electrode contacts 311 of the first electrode assembly 310, which will not be described here. Each electrode contact 311 can be connected to the transmission member 600, respectively, so that the plurality of electrode contacts 311 can be driven to contact the substrate 500 to be coated by the transmission member 600. Thus, the first electrode assembly 310 and / or the second electrode assembly 320 includes a plurality of electrode contacts 311, which can be in contact with the substrate 500 to be coated at the same time, thereby improving the uniformity of the applied current and the diffusion area of the current, and improving the uniformity of the substrate 500 to be coated being impregnated by the slurry 400.

[0081] Referring to FIGS. 1-7, FIG. 6 is a first structural schematic diagram of the plurality of electrode contacts 311 arranged in the electrode transmission assembly in the coating system 10 according to one or more embodiments of the present application; and FIG. 7 is a second structural schematic diagram of the plurality of electrode contacts 311 arranged in the electrode transmission assembly in the coating system 10 according to one or more embodiments of the present application.

[0082] The intervals of the plurality of electrode contacts 311 are arranged in a non-equidistant manner. Taking the plurality of electrode contacts 311 of the first electrode assembly 310 as an example, the plurality of electrode contacts 311 can be arranged in a linear array along a direction perpendicular to the movement direction of the supply head of the slurry supply device 200, and the non-equidistant arrangement of the plurality of electrode contacts 311 can be understood as the intervals between adjacent two electrode contacts 311 being arranged in a random manner. The arrangement of the plurality of electrode contacts 311 can be arranged according to the amount of slurry 400 loaded on the supply head of the slurry supply device 200, for example, the positions of the electrode contacts 311 and the supply head corresponding in the movement direction of the supply head, and the amount of slurry 400 discharged by the supply head can be proportional to the arrangement tightness of the electrode contacts 311. For example, the intervals between adjacent two electrode contacts 311 can be arranged in a manner of alternating wide intervals and narrow intervals along a direction perpendicular to the movement direction of the supply head of the slurry supply device 200. Alternatively, as shown in FIG. 6, the plurality of electrode contacts 311 can be arranged in a manner that the intervals between adjacent two electrode contacts 311 closer to the middle portion are narrower along a direction perpendicular to the movement direction of the supply head of the slurry supply device 200. Alternatively, as shown in FIG. 7, the plurality of electrode contacts 311 can be arranged in a manner that the intervals between adjacent two electrode contacts 311 closer to the middle portion are wider along a direction perpendicular to the movement direction of the supply head of the slurry supply device 200. Similarly, when the second electrode assembly 320 includes a plurality of electrode contacts 311 arranged at intervals, the arrangement of the plurality of electrode contacts 311 of the second electrode assembly 320 can be the same as or similar to that of the plurality of electrode contacts 311 of the first electrode assembly 310, which will not be described here.

[0083] Alternatively, the current loading device 300 includes a voltage adjusting circuit 340 connected to the plurality of electrode contacts 311. The voltage adjusting circuit 340 can be electrically connected to the plurality of electrode contacts 311, and the voltage adjusting circuit 340 can synchronously adjust the current size loaded on each electrode contact 311, or the voltage adjusting circuit 340 can be used to adjust the current size loaded on each electrode contact 311 respectively, so as to correspondingly apply different current sizes according to the size of the amount of slurry 400 at different positions, thereby improving the uniformity of slurry 400 infiltration while improving the wettability. Therefore, the non-equidistant arrangement of the intervals of the electrode contacts 311 or the connection of the voltage adjusting circuit 340 to the plurality of electrode contacts 311 can facilitate the corresponding application of different current sizes according to the size of the amount of slurry 400 at different positions, thereby improving the uniformity of slurry 400 infiltration while improving the wettability.

[0084] The slurry supply device 200 can be configured to apply the slurry 400 to the substrate 500 to be coated in synchronization along a strip-shaped region parallel to the direction of spacing between the plurality of electrode contacts 311, the spacing between the electrode contacts 311 varies with the length of the strip-shaped region or the voltage adjustment circuit 340 is configured to vary the voltage applied to the electrode contacts 311 with the length of the strip-shaped region. The slurry supply device 200 applies the slurry 400 through the strip-shaped region, and the strip-shaped region is parallel to the direction of spacing between the plurality of electrode contacts 311, so that when the slurry supply device 200 applies the slurry 400 to the substrate 500 to be coated through the strip-shaped region at one position, the slurry 400 applied to the substrate 500 to be coated is in a strip shape, and when the strip-shaped region is translated along a direction perpendicular to the direction of spacing between the plurality of electrode contacts 311, the slurry 400 can be applied to the entire substrate 500 to be coated. The spacing between the electrode contacts 311 varies with the length of the strip-shaped region can be understood as that the spacing between the electrode contacts 311 is positively or negatively correlated with the length of the strip-shaped region, for example, the longer the strip-shaped region, the smaller the spacing between the electrode contacts 311. The voltage adjustment circuit 340 is configured to vary the voltage applied to the electrode contacts 311 with the length of the strip-shaped region can be understood as that the magnitude of the voltage applied by the voltage adjustment circuit 340 is positively or negatively correlated with the length of the strip-shaped region, for example, the longer the strip-shaped region, the greater the voltage applied by the voltage adjustment circuit 340.

[0085] The length of the strip-shaped region can also be understood as the amount of slurry 400 applied at the corresponding position varies, and the amount of slurry 400 applied at different positions in the length direction of the strip-shaped region is different, for example, the amount of slurry 400 applied at the central position is greater than that at the edge position. Correspondingly, the spacing between the electrode contacts 311 corresponding to the position where the amount of slurry 400 applied is greater is smaller, and the spacing between the electrode contacts 311 corresponding to the position where the amount of slurry 400 applied is smaller is greater; or the voltage applied by the voltage adjustment circuit 340 to the electrode contacts 311 corresponding to the position where the amount of slurry 400 applied is greater is greater, and the voltage applied by the voltage adjustment circuit 340 to the electrode contacts 311 corresponding to the position where the amount of slurry 400 applied is smaller is smaller. Thus, by changing the spacing between the electrode contacts 311 or the voltage applied to the electrode contacts 311 to change the current intensity, different sizes of current can be applied corresponding to the size of the amount of slurry 400 at different positions more accurately, so as to improve the uniformity of the slurry 400 infiltration while improving the wettability.

[0086] Referring to FIGS. 1, 8 and 9, FIG. 8 is a third structural schematic diagram of the coating system 10 according to one or more embodiments of the present application; and FIG. 9 is a side structural schematic diagram of the coating system 10 shown in FIG. 8.

[0087] The current loading device 300 is arranged on the slurry supply device 200, and the first electrode assembly 310 and the second electrode assembly 320 are electrically connected with the slurry 400 supplied by the slurry supply device 200. The first electrode assembly 310 and the second electrode assembly 320 of the current loading device 300 can be arranged on the slurry supply device 200, and the power supply 330 of the current loading device 300 can be arranged on the slurry supply device 200 or other positions, for example, the power supply 330 can also be carried on the substrate carrying device 100.

[0088] The first electrode assembly 310 and the second electrode assembly 320 can be arranged at any position of the slurry supply device 200, so as to enable the first electrode assembly 310 and the second electrode assembly 320 to directly or indirectly contact the slurry 400, and then enable the first electrode assembly 310 and the second electrode assembly 320 to directly or indirectly load current to the slurry 400 through the power supply 330. For example, the slurry supply device 200 has a supply head, and the first electrode assembly 310 and the second electrode assembly 320 can be arranged at any position of the supply head, such as the first electrode assembly 310 and the second electrode assembly 320 can be arranged at two sides of the supply head in the thickness direction of the supply head; or the first electrode assembly 310 and the second electrode assembly 320 can be arranged at two sides of the supply head in the length direction of the supply head; or the first electrode assembly 310 and the second electrode assembly 320 are arranged at the same side of the supply head, and the like.

[0089] The first electrode assembly 310 and / or the second electrode assembly 320 can be in direct contact with the slurry 400, so that the first electrode assembly 310 and / or the second electrode assembly 320 directly loads the current to the slurry 400. For example, the slurry supply device 200 can have a receiving cavity 220 for receiving the slurry 400, and the first electrode assembly 310 and / or the second electrode assembly 320 directly extends into the receiving cavity 220 and directly contacts the slurry 400 in the receiving cavity 220, so that the first electrode assembly 310 and / or the second electrode assembly 320 directly loads the current to the slurry 400. The first electrode assembly 310 and / or the second electrode assembly 320 can also be electrically connected to the receiving cavity 220, so that the current is conducted to the slurry 400 in the receiving cavity 220 through the receiving cavity 220. Alternatively, the slurry 400 loading device has a conveying path for conveying the slurry 400, and the first electrode assembly 310 and / or the second electrode assembly 320 is located on the conveying path, so that the first electrode assembly 310 and / or the second electrode assembly 320 directly contacts the slurry 400 on the conveying path, so that the first electrode assembly 310 and / or the second electrode assembly 320 directly loads the current to the slurry 400. Alternatively, the slurry 400 loading device has a slurry 400 output port for outputting the slurry 400, and the first electrode assembly 310 and / or the second electrode assembly 320 is located at the slurry 400 output port, so that the slurry 400 flowing out of the slurry 400 output port passes through the first electrode assembly 310 and / or the second electrode assembly 320, so that the first electrode assembly 310 and / or the second electrode assembly 320 directly contacts the slurry 400 on the conveying path, so that the first electrode assembly 310 and / or the second electrode assembly 320 directly loads the current to the slurry 400.

[0090] Alternatively, the first electrode assembly 310 and / or the second electrode assembly 320 can be indirectly contacted with the slurry 400 through other conductors, so that the first electrode assembly 310 and / or the second electrode assembly 320 indirectly loads the current to the slurry 400 through the other conductors. For example, the first electrode assembly 310 and / or the second electrode assembly 320 is in contact with a conductor portion of the slurry supply device 200, and the slurry 400 is also in contact with the conductor portion of the slurry supply device 200, so that the first electrode assembly 310 and / or the second electrode assembly 320 can be indirectly contacted with the slurry 400 through the conductor portion of the slurry supply device 200, so that the first electrode assembly 310 and / or the second electrode assembly 320 indirectly loads the current to the slurry 400 through the other conductors. In this way, the current loading device 300 is arranged on the slurry supply device 200, which facilitates the direct contact between the first electrode assembly 310 and the second electrode assembly 320 and the slurry 400, and improves the stability of the current loaded to the slurry 400, and improves the wettability of the slurry 400 penetrating into the substrate 500 to be coated.

[0091] Referring to FIG. 1, FIG. 10 and FIG. 11, FIG. 10 is a fourth schematic view of the coating system 10 according to one or more embodiments of the present application; and FIG. 11 is a top schematic view of the coating system 10 shown in FIG. 10.

[0092] The coating system 10 further comprises a coating head 210 for coating the paste 400 supplied by the paste supply device 200 onto the substrate 500 to be coated, the current loading device 300 is disposed on the coating head 210, and the first electrode assembly 310 and the second electrode assembly 320 are electrically connected with the coating head 210. The coating head 210 can be understood as a position where the paste supply device 200 is used to set the outlet of the paste 400, and the coating head 210 can have a conductive property, for example, the coating head 210 can be located on the supply head of the paste supply device 200. The first electrode assembly 310 and the second electrode assembly 320 of the current loading device 300 can be disposed on the paste supply device 200, and the power supply 330 of the current loading device 300 can be disposed on the paste supply device 200 or other positions, for example, the power supply 330 can also be carried on the substrate carrier 100.

[0093] The first electrode assembly 310 and the second electrode assembly 320 can be located at any position of the coating head 210, so as to enable the first electrode assembly 310 and the second electrode assembly 320 to directly or indirectly contact the paste 400, and further enable the first electrode assembly 310 and the second electrode assembly 320 to directly or indirectly load current to the paste 400 through the power supply 330. For example, the first electrode assembly 310 and the second electrode assembly 320 can be located on both sides of the supply head in the thickness direction of the coating head 210; or the first electrode assembly 310 and the second electrode assembly 320 can be located on both sides of the supply head in the length direction of the coating head 210; or the first electrode assembly 310 and the second electrode assembly 320 are located on the same side of the supply head, and the like.

[0094] The first electrode assembly 310 and / or the second electrode assembly 320 can directly contact the paste 400, so as to directly load current to the paste 400 through the first electrode assembly 310 and / or the second electrode assembly 320, for example, the first electrode assembly 310 and / or the second electrode assembly 320 are disposed on the coating head 210, and the first electrode assembly 310 and / or the second electrode assembly 320 can penetrate through the coating head 210, so as to enable the first electrode assembly 310 and / or the second electrode assembly 320 to directly contact the paste 400 in the coating head 210, and further enable the first electrode assembly 310 and / or the second electrode assembly 320 to directly load current to the paste 400.

[0095] Alternatively, the first electrode assembly 310 and / or the second electrode assembly 320 can be indirectly contacted with the paste 400, so that the first electrode assembly 310 and / or the second electrode assembly 320 indirectly load the paste 400 with electric current. For example, the first electrode assembly 310 and / or the second electrode assembly 320 are connected with the outer surface of the coating head 210, while the paste 400 is located at the inner side of the coating head 210, so that the first electrode assembly 310 and / or the second electrode assembly 320 can be indirectly contacted with the paste 400 through the coating head 210, and the first electrode assembly 310 and / or the second electrode assembly 320 indirectly load the paste 400 with electric current through other conductors. In this way, the current loading device 300 is arranged on the coating head 210, which is conducive to fixing the current loading device 300, and the first electrode assembly 310 and the second electrode assembly 320 are electrically connected with the coating head 210, which is conducive to the first electrode assembly 310 and the second electrode assembly 320 loading the paste 400 with electric current through the coating head 210, and is conducive to improving the stability of the current loading.

[0096] The substrate carrying device 100 can further comprise a substrate driving assembly for driving the to-be-coated substrate 500 to move relative to the supply head of the paste supply device 200, and the first electrode assembly 310 and the second electrode assembly 320 are arranged on the paste supply device 200. The substrate driving assembly can also be arranged to drive the to-be-coated substrate 500 to move close to or away from the coating head 210, so as to adjust the distance between the to-be-coated substrate 500 and the coating head 210, and more easily control the amount of paste 400 applied to the to-be-coated substrate 500.

[0097] The substrate driving assembly can be used to carry the to-be-coated substrate 500, and the supply head of the paste supply device 200 can be located above the to-be-coated substrate in the direction of gravity, so that the paste 400 produced from the supply head can be applied to the to-be-coated substrate 500 under the influence of its own gravity, and during the process of applying the paste 400 to the to-be-coated substrate 500, the substrate driving assembly synchronously drives the to-be-coated substrate 500 to move relative to the supply head, so as to be able to apply the paste 400 to different positions of the to-be-coated substrate 500. As shown in FIG. 1, the to-be-coated substrate 500 can be in the form of a plate, the to-be-coated substrate 500 is carried on the substrate driving assembly, the supply head is located above the to-be-coated substrate 500 in the direction of gravity, and the substrate driving assembly can drive the to-be-coated substrate 500 to move relative to the supply head. Alternatively, as shown in FIGS. 8-11, the to-be-coated substrate 500 can have flexibility, and the substrate driving assembly can comprise a plurality of driving rollers for stretching the to-be-coated substrate 500, and at least part of the plurality of driving rollers can rotate about their own axes, thereby driving the to-be-coated substrate 500 to move relative to the supply head. In this way, by driving the to-be-coated substrate 500 to move relative to the supply head through the substrate driving assembly, it is convenient to more comprehensively apply the paste 400 to the to-be-coated substrate 500, and improve the coating efficiency.

[0098] In some other embodiments, one end of the first electrode assembly 310 and the second electrode assembly 320 is fixedly connected with the slurry supply device 200, and the other end of the first electrode assembly 310 and the second electrode assembly 320 extends to contact the substrate to be coated, so that the first electrode assembly 310 and the second electrode assembly 320 load current to the substrate to be coated 500. Wherein, the end of the first electrode assembly 310 and / or the second electrode assembly 320 in contact with the substrate to be coated can be provided with a rolling member. During the process that the substrate transmission assembly drives the movement of the substrate to be coated 500 relative to the slurry 400 loading area, the rolling member can roll to reduce the friction between the first electrode assembly 310 and / or the second electrode assembly 320 and the substrate to be coated 500.

[0099] Referring to FIG. 1 and FIG. 12, FIG. 12 is a fifth structural schematic diagram of the coating system 10 according to one or more embodiments of the present application.

[0100] The substrate carrying device 100 is arranged such that the first electrode assembly 310 and the second electrode assembly 320 rotate synchronously with the substrate to be coated 500 around a rotation axis perpendicular to the surface to be coated of the substrate to be coated 500, the rotation axis being located in the spacing region between the first electrode assembly 310 and the second electrode assembly 320. The substrate to be coated 500 can include a carrier, as shown in FIG. 12, the carrier of the substrate to be coated 500 can have a receiving groove, the first electrode assembly 310, the second electrode assembly 320 and the substrate to be coated 500 are located in the receiving groove, and the first electrode assembly 310 and the second electrode assembly 320 are arranged on both sides of the substrate to be coated 500. The power supply 330 of the power supply 330 of the device can be located in the carrier, wherein the inside of the carrier can be embedded with wires, the wires can be arranged inside the transmission member 600, and then the power supply 330 of the current loading device 300 can be electrically connected to the first electrode assembly 310 and the second electrode assembly 320 through the wires, which can simplify the wiring between the first electrode assembly 310 and the power supply 330 and between the second electrode assembly 320 and the power supply 330, and alleviate the interference of the complex wire harness with the slurry supply device 200. The rotation axis can be the central axis of the carrier, the carrier can rotate around its central axis, and then the substrate to be coated 500, the first electrode assembly 310 and the second electrode assembly 320 are all rotated around the rotation axis. Therefore, the substrate carrying device 100 makes the first electrode assembly 310 and the second electrode assembly 320 rotate synchronously with the substrate to be coated 500 around the rotation axis perpendicular to the surface to be coated, so that the slurry 400 applied to the substrate to be coated 500 can be more quickly and comprehensively covered on the surface to be coated through the rotation of the substrate carrying device 100, thereby improving the coating efficiency, and the synchronous rotation of the first electrode assembly 310 and the second electrode assembly 320 with the substrate to be coated also facilitates the formation of a stable current on the substrate to be coated by the first electrode assembly 310 and the second electrode assembly 320, and also alleviates the interference of the first electrode assembly 310 and the second electrode assembly 320 with the slurry supply device 200.

[0101] In summary, the current loading device 300 loads the slurry 400 with current, which can reduce the contact angle between the slurry 400 and the substrate to be coated, improve the wettability of the slurry 400 to the substrate to be coated 500, and improve the coating effect. Compared with generating static electricity by using a high-voltage electrode plate, the current loading device 300 loads the slurry 400 with current, which can improve the wettability of the slurry 400 to the substrate to be coated 500 in a low-voltage manner, which is more conducive to industrial application.

[0102] To solve the technical problems in the related art, the application further provides a coating method, which can be applied to the coating system 10 of any of the above embodiments, as shown in FIG. 12, which is a flowchart of the coating method according to one or more embodiments of the application.

[0103] Step S101: Place the substrate to be coated on the substrate carrying device.

[0104] The substrate to be coated can be placed on the substrate carrying device manually by hand or automatically by other tooling. The substrate carrying device can have a fixing structure for fixing the substrate to be coated, and the substrate to be coated can be placed on the fixing structure of the substrate carrying device, so that the substrate to be coated is fixed by the substrate carrying device 100.

[0105] Step S102: Load the substrate to be coated or the slurry for coating with current.

[0106] After the substrate to be coated is placed on the substrate carrying device, the substrate to be coated can be loaded with current by the current loading device, so that the substrate to be coated is in an electrified state, and when the slurry is applied to the substrate to be coated, the current can be transmitted to the slurry applied to the substrate to be coated by the substrate to be coated. Alternatively, the slurry for coating can be pre-loaded with current by the current loading device, so that the slurry with current is directly applied to the substrate to be coated. The specific way in which the current loading device loads the substrate to be coated or the slurry for coating with current can be any of the above-mentioned ways in which the current loading device loads the substrate to be coated with current, which will not be described here.

[0107] Step S103: Apply the slurry to the substrate to be coated.

[0108] After the substrate to be coated or the slurry for coating is loaded with current, the slurry can be applied to the substrate to be coated by the slurry supply device, so as to trigger the contact electro-wetting effect (CEW effect). The current causes charge transfer to spontaneously cause a change in the wettability of the substrate to be coated, so as to reduce the contact angle between the slurry and the substrate to be coated, improve the wettability of the slurry penetrating into the substrate to be coated, and thus reduce other conditions that can affect the wettability, such as reducing the wettability time of the substrate to be coated, reducing the ambient temperature of the substrate to be coated, reducing the solution concentration of the slurry, and the like. The specific way in which the slurry supply device applies the slurry to the substrate to be coated can be any of the above-mentioned ways in which the slurry supply device applies the slurry to the substrate to be coated, which will not be described here.

[0109] Step S104: Apply the slurry to the substrate to be coated.

[0110] The slurry can be applied to the substrate to be coated simultaneously with the coating of the slurry on the substrate to be coated. For example, the substrate to be coated and the slurry supply device can be relatively moved to apply the slurry to the substrate to be coated during the application of the slurry to the substrate to be coated. The specific manner in which the substrate to be coated and the slurry supply device are relatively moved can be any of the manners described above in connection with the coating system, and will not be described again here.

[0111] Alternatively, the substrate to be coated can be rotated by the substrate support device to apply the slurry to the substrate to be coated during the application of the slurry to the substrate to be coated. The specific manner in which the substrate to be coated is rotated by the substrate support device can be any of the manners described above in connection with the coating system, and will not be described again here.

[0112] In some embodiments, the loading of the current to the substrate to be coated or the slurry for coating includes loading the current to the substrate to be coated, conducting the current through the substrate to be coated to the slurry applied on the substrate to be coated, or directly loading the current to the slurry.

[0113] Before the loading of the current to the substrate to be coated, the first electrode assembly and the second electrode assembly of the current loading device can be brought into contact with the substrate to be coated, and then the first electrode assembly and the second electrode assembly are electrified to load the current to the substrate to be coated. When the slurry is applied to the substrate to be coated, the current can be transmitted to the slurry applied on the substrate to be coated through the substrate to be coated. Alternatively, the first electrode assembly and the second electrode assembly of the current loading device can be brought into contact with the holding cavity of the slurry supply device for holding the slurry, and then the first electrode assembly and the second electrode assembly are electrified to directly apply the current to the slurry. The manner in which the first electrode assembly and the second electrode assembly of the current loading device are brought into contact with the substrate to be coated can be any of the manners described above in connection with the coating system, and will not be described again here.

[0114] In some embodiments, the coating method further includes adjusting the intensity of the loading current based on the amount of the slurry applied on the substrate to be coated.

[0115] The corresponding current intensity can be controlled by a voltage regulating circuit, which can receive the application amount signal of the slurry and then adjust the intensity of the loading current through the application amount signal of the slurry. The greater the application amount of the slurry, the greater the corresponding current intensity required. Alternatively, the corresponding current intensity can be represented by the tightness of the multiple electrode contacts of the first electrode assembly and / or the multiple electrode contacts of the second electrode assembly. When more slurry is applied to the substrate to be coated, the electrode contacts of the first electrode assembly and / or the second electrode assembly are arranged more tightly to achieve the purpose of increasing the current intensity; on the contrary, when less slurry is applied to the substrate to be coated, the electrode contacts of the first electrode assembly and / or the second electrode assembly are arranged more sparsely to achieve the purpose of reducing the current intensity. Alternatively, the multiple electrode contacts are all electrically connected to the voltage regulating circuit, and the current size loaded by each electrode contact can be adjusted synchronously by the voltage regulating circuit, or the current size loaded by each electrode contact can be adjusted separately by the voltage regulating circuit, so as to apply different sizes of current corresponding to the size of the slurry amount at different positions.

[0116] In summary, the current loading device loads current to the slurry, which can reduce the contact angle between the slurry and the substrate to be coated, improve the wettability of the slurry penetrating into the substrate to be coated, and improve the coating effect. Compared with generating static electricity by using a high-voltage electrode plate, the current loading device loads current to the slurry, which can improve the wettability of the slurry penetrating into the substrate to be coated in a low-voltage manner, and is more conducive to industrial application.

[0117] To solve the technical problems in the related art, the application further provides a preparation method of a perovskite battery. Referring to FIGS. 14 and 15, FIG. 14 is a flowchart of a preparation method of a perovskite battery according to one or more embodiments of the application, and FIG. 15 is a structural schematic diagram of an embodiment of the perovskite battery provided by the application. The first electrode is in the light incidence direction, and a p-i-n structure is obtained. In another embodiment, the positions of the hole transport layer and the electron transport layer are interchanged (not shown in the figure), the first electrode is in the light incidence direction, and an n-i-p structure is obtained.

[0118] Here, taking the p-i-n structure as an example, the preparation method of the perovskite battery is provided as follows:

[0119] Step S121: providing a first electrode.

[0120] The first electrode can be an anode layer, and the first electrode can be selected from at least one of fluorine-doped tin oxide (FTO), indium tin oxide (ITO), aluminum-doped zinc oxide (AZO), boron-doped zinc oxide (BZO), indium zinc oxide (IZO), and indium tungsten oxide (IWO), and the thickness of the first electrode can be between 100 nm and 1000 nm, and in particular, the thickness of the first electrode can be between 300 nm and 800 nm. The first electrode can be disposed on the transparent substrate layer, and a transparent conductive oxide layer can be disposed on the transparent substrate layer, and then the first electrode attached to the transparent substrate layer is obtained. After the transparent conductive oxide layer is attached to the transparent substrate layer, a pre-operation can be performed on the transparent substrate with the first electrode before the subsequent film layer is attached. The pre-operation can include cleaning the transparent substrate layer, for example, sequentially ultrasonic cleaning with water, acetone, and isopropyl alcohol, and the cleaning time is between 1 minute and 30 minutes, then blowing dry the liquid on the cleaned transparent substrate, and then placing the transparent substrate into an ultraviolet oxygen machine for further cleaning, for example, the further cleaning time is between 1 minute and 20 minutes. The transparent substrate layer can be selected from at least one of transparent glass, polyethylene terephthalate (PET), and polyimide substrate, and the thickness of the transparent substrate layer can be between 0.1 cm and 3 cm.

[0121] Step S122: preparing a hole transport layer on the first electrode.

[0122] The hole transport layer can include a nickel oxide hole transport layer, and the hole transport layer can be prepared on the first electrode by using a nickel oxide target material by a magnetron sputtering method. The nickel oxygen ratio of the nickel oxide target material can be 0.9-1.1, or the hole transport layer can be prepared on the first electrode by a coating method. The total thickness of the hole transport layer can be between 12 nm and 50 nm, further between 12 nm and 25 nm, or between 18 nm and 25 nm.

[0123] The hole transport layer can also include 2,2',7,7'-tetra(N,N-p-methoxyphenylamine)-9,9'-spirobifluorene (Spiro-OMeTAD), poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz), [4-(3,6-dimethoxy-9H-carbazol-9-yl)butyl]phosphonic acid (MeO-4PACz), etc., and the hole transport layer can be prepared on the first electrode by a coating method.

[0124] Step S123: preparing a perovskite layer on the hole transport layer; wherein the perovskite layer is prepared by the coating method as described above.

[0125] For example, the substrate on which the hole transport layer is prepared can be placed as the above-mentioned to-be-coated substrate on the substrate carrying device, then the slurry is applied to the surface of the hole transport layer of the to-be-coated substrate through the slurry supply device, and then the current is loaded to the surface of the hole transport layer or the slurry through the current loading device, so that the slurry infiltrates the to-be-coated substrate under the action of the current, so as to prepare the perovskite layer on the hole transport layer. The slurry can be a mixture solution, for example, the relevant materials (at least one of formamidinium iodide, lead iodide, methylamine bromide, methylamine iodide, cesium iodide, lead bromide, etc.) are dissolved in a solvent (dimethylformamide (DMF), dimethyl sulfoxide (DMSO) or N-methyl pyrrolidone (NMP), etc.), stirred uniformly, and then filtered to obtain the slurry, i.e. perovskite precursor solution. The thickness of the perovskite layer can be between 200 nm and 800 nm, and specifically can be between 400 nm and 600 nm.

[0126] The perovskite material includes at least one of a compound represented by [A][B][X]3, a compound represented by [A]2[C][D][X]6, wherein A includes at least one of inorganic or organic monovalent cations, B includes at least one inorganic divalent cation, C includes at least one inorganic monovalent cation, D includes at least one inorganic trivalent cation, and X includes at least one monovalent anion.

[0127] Exemplarily, the organic monovalent cation includes one or more of (H2N=CH-NH2)+ (abbreviated as FA), CH3NH3+ (abbreviated as MA). The inorganic monovalent cation includes at least one of Li+, Na+, K+, Rb+, Cs+, Cu+, Ag+, Au+ or Hg+.

[0128] Exemplarily, the inorganic divalent cation includes at least one of Pb 2+ , Sn 2+ , Be 2+ , Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , Zn 2+ , Ge 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cd 2+ , Cu 2+ , Mn 2+ , Pd 2+ , Yb 2+ or Eu 2+ .

[0129] Exemplarily, the inorganic trivalent cation includes at least one of Bi 3+ , Sb 3+ , Cr3+ Fe 3+ Co 3+ Ga 3+ As 3+ Ru 3+ Rh 3+ In 3+ Ir 3+ Au 3+ or Al 3+ .

[0130] Exemplarily, the monovalent anion includes at least one of F - , Cl - , Br - , I - , SCN - , CNO - , OCN - , OSCN - , SH - , OH - , CN - , SeCN - .

[0131] In some embodiments, the perovskite layer includes at least one of Cs 0.05 FA 0.95 PbBr 0.15 I 2.85 , Cs 0.1 MA 0.15 FA 0.75 PbCl 0.15 I 2.85 , MAPbI3, FAPbI3, (FA 0.83 MA 0.17 ) 0.95 Cs 0.05 Pb(I 0.83 Br 0.17 )3, CsPbI3, CsPbI2Br, CsPbIBr2.

[0132] Step S124: preparing an electron transport layer on the perovskite layer.

[0133] The function of the electron transport layer includes efficient transport of free electrons generated by the perovskite layer, and effective blocking of free holes from passing through, and forming an ohmic contact at the interface with the perovskite active layer. The material of the electron transport layer can include, but is not limited to, at least one of the following materials and derivatives thereof and materials obtained by doping or passivation thereof: fullerene C 60 , fullerene C 70 , [6,6]-phenyl C 61 methyl butyrate (PC 61BM), [6,6]-phenyl C 71 methyl butyrate (PC 71 BM), tin dioxide (SnO2), zinc oxide (ZnO), etc. The preparation method of the electron transport layer can include, but is not limited to, a coating method, a spin coating method, or an evaporation method, etc. The thickness of the electron transport layer can include, but is not limited to, between 10 nm and 200 nm, specifically can be between 30 nm and 120 nm, specifically can be between 40 nm and 60 nm.

[0134] Step S125: preparing a second electrode on the electron transport layer to obtain a perovskite battery.

[0135] The second electrode can be a cathode layer, and the second electrode has the function of collecting free electrons. The second electrode can generally include an organic or inorganic or organic-inorganic hybrid conductive material, and the second electrode can include, but is not limited to, at least one of indium tin oxide (ITO), lanthanide metal doped indium oxide, boron doped zinc oxide (BZO), aluminum zinc oxide (AZO), indium zinc oxide (IZO), gallium zinc oxide (GZO), indium tungsten oxide (IWO), Au, Ag, Cu, Al, Ni, Cr, Bi, Pt, Mg, Mo, W, and alloys thereof, graphite, graphene, carbon nanotubes; optionally Ag, Cu, C, Au, Al, ITO, AZO, BZO, or IZO, and further optionally Cu, Ag, Au, or a combination thereof. The thickness of the second electrode can be between 20 nm and 200 nm, optionally can be between 60-100 nm, and further optionally can be between 70 nm and 90 nm. The preparation method of the electron transport layer can include, but is not limited to, a spin coating method or an evaporation method, etc. After the second electrode is prepared on the electron transport layer, the above prepared layers can be packaged to obtain a perovskite battery.

[0136] To solve the technical problems in the related art, the present application provides a perovskite battery. As shown in FIG. 15, the perovskite battery is prepared by the preparation method of the perovskite battery as described above.

[0137] The perovskite battery can include a transparent substrate layer, a first electrode, a hole transport layer, a perovskite layer, an electron transport layer, and a second electrode which are sequentially stacked.

[0138] The transparent substrate layer can be selected from at least one of transparent glass, polyethylene terephthalate (PET), and polyimide substrate, and the thickness of the transparent substrate layer can be between 0.1 cm and 3 cm. The hole transport layer can include a nickel oxide hole transport layer, the nickel-to-oxygen ratio of the nickel oxide target material can be 0.9-1.1, and the total thickness of the hole transport layer can be between 12 nm and 50 nm, further between 12 nm and 25 nm, or between 18 nm and 25 nm. The perovskite layer can serve as a light absorption layer of the perovskite battery, and the thickness of the perovskite layer can be between 200 nm and 800 nm, specifically between 400 nm and 600 nm. The electron transport layer functions to efficiently transport free electrons generated by the perovskite layer and effectively block the passage of free holes, and forms an ohmic contact at the interface with the perovskite active layer, and the thickness of the electron transport layer can include but is not limited to between 10 nm and 200 nm, specifically between 30 nm and 120 nm, and specifically between 40 nm and 60 nm. The second electrode can be a cathode layer, and the second electrode functions to collect free electrons, and the thickness of the second electrode can be between 20 nm and 200 nm, optionally between 60 nm and 100 nm, and further optionally between 70 nm and 90 nm.

[0139] To solve the technical problems in the related art, the present application provides a kind of electric device, and the electric device includes the perovskite battery as described above.

[0140] The perovskite battery serves as a power supply for the above-mentioned electric device, or the perovskite battery can serve as an energy storage unit for the above-mentioned electric device. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric aircraft toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0141] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coating system characterized by, The coating system comprises: a substrate carrying device for carrying a substrate to be coated; a slurry supply device for applying a slurry to the substrate to be coated, the slurry supply device comprising a holding cavity containing the slurry; a current loading device, which is electrically connected to the substrate to be coated, or to the holding cavity of the slurry supply device.

2. The coating system of claim 1, wherein, The current loading device comprises a first electrode assembly and a second electrode assembly, which are simultaneously electrically connected to the substrate to be coated, or to the holding cavity of the slurry supply device.

3. The coating system of claim 2, wherein, The current loading device is arranged on the substrate carrying device, and the first electrode assembly and the second electrode assembly are electrically connected to the substrate to be coated during the coating process.

4. The coating system of claim 3, wherein, The coating system further comprises a transmission member connected to the first electrode assembly and the second electrode assembly, for driving the first electrode assembly and the second electrode assembly to contact the substrate to be coated.

5. The coating system according to claim 3 or 4, characterized in that The first electrode assembly and the second electrode assembly are arranged at intervals along the substrate to be coated.

6. The coating system according to claim 4 or 5, characterized in that The first electrode assembly and / or the second electrode assembly comprise a plurality of electrode contacts.

7. The coating system of claim 6, wherein, The spacing of the plurality of electrode contacts is arranged in a non-equidistant manner, or the current loading device comprises a voltage adjustment circuit connected to the plurality of electrode contacts.

8. A coating method characterized by, The coating method comprises: placing a substrate to be coated on a substrate carrying device; loading a current to the substrate to be coated or a slurry for coating; applying a slurry to the substrate to be coated; coating the slurry on the substrate to be coated.

9. The coating method according to claim 8, characterized in that, The loading of a current to the substrate to be coated or a slurry for coating comprises: loading a current to the substrate to be coated, and conducting the current through the substrate to be coated to the slurry applied on the substrate to be coated; or directly loading a current to the slurry.

10. The coating method according to claim 8 or 9, characterized in that, The coating method further comprises: adjusting the intensity of the loaded current based on the amount of slurry applied on the substrate to be coated.

11. A method of producing a perovskite cell, characterized by, The preparation method comprises: providing a first electrode; preparing a first carrier transport layer on the first electrode; preparing a perovskite layer on the first carrier transport layer; wherein the perovskite layer is prepared by the coating method according to any one of claims 8 to 10; preparing a second carrier transport layer on the perovskite layer; preparing a second electrode on the second carrier transport layer to obtain the perovskite battery; wherein the first carrier transport layer comprises one of a hole transport layer or an electron transport layer, and the second carrier transport layer comprises the other of a hole transport layer or an electron transport layer.

12. A perovskite cell, characterized in that, The perovskite battery is prepared by the preparation method of the perovskite battery according to claim 11.

13. An electrical device, characterized by The electric device comprises the perovskite battery according to claim 12.

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