Electret film, power generation device, and electronic apparatus

Abstract

The embodiment of the invention provides an electret film, a power generation device and electronic equipment, and belongs to the technical field of electrets. The electret thin film comprises an electret substrate, a first hole structure and first micro-nano particles. The first pore structure is arranged on the electret substrate and is used for accommodating the first micro-nano particles; at least one surface of the electret substrate is provided with first micro-nano particles. According to the electret film, the power generation device and the electronic equipment provided by the embodiment of the invention, the energy collection efficiency can be improved, so that the endurance time of the electronic equipment is prolonged.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electret technology, and in particular to an electret film, a power generation device, and an electronic device. Background Art

[0002] Usually, in order to improve the battery life of electronic devices such as watches, bracelets, and mobile phones, an energy collection module based on mechanical energy is integrated, which can collect and store the user's exercise energy when the user is exercising. Among them, the energy collection efficiency of the energy collection module is positively correlated with the extension of the battery life of the electronic device. The higher the energy collection efficiency of the energy collection module, the longer the battery life of the electronic device is extended. Therefore, how to improve the energy collection efficiency has become a problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application provide an electret film, a power generation device, and an electronic device, which can improve energy collection efficiency to increase the battery life of the electronic device.

[0004] In a first aspect, the present application provides an electret film, comprising an electret substrate, a first pore structure and first micro-nano particles. The first pore structure is arranged on the electret substrate, and the first pore structure is used to accommodate the first micro-nano particles. The first micro-nano particles are arranged on at least one surface of the electret substrate.

[0005] The electret film provided in the embodiment of the present application can increase the effective surface area of ​​the electret film by arranging a first pore structure for accommodating the first micro-nano particles on the electret substrate, so that more charges can be stored during the electret process, thereby increasing the surface potential of the electret film. In addition, by arranging the first micro-nano particles on the surface of the electret substrate, the effective surface area of ​​the electret film can be further increased on the basis of increasing the effective surface area of ​​the electret film through the first pore structure, so that more charges can be further stored during the electret process, thereby further increasing the surface potential of the electret film. Therefore, by cooperating with the first pore structure and the first micro-nano particles, the effective surface area of ​​the electret film is increased, thereby increasing the surface potential of the electret film, thereby increasing the energy collection efficiency.

[0006] In a possible implementation, at least one surface of the electret substrate is provided with first micro-nanoparticles of various sizes.

[0007] The electret film provided in the embodiment of the present application can further increase the effective surface area of ​​the electret film by disposing first micro-nanoparticles of various sizes on the same surface of the electret substrate, which helps to further increase the surface potential of the electret film.

[0008] In a possible implementation, at least two first micro-nanoparticles with different structures are disposed on at least one surface of the electret substrate.

[0009] The electret film provided in the embodiment of the present application can further increase the effective surface area of ​​the electret film by disposing a plurality of first micro-nanoparticles with different structures on the same surface of the electret substrate, which helps to further increase the surface potential of the electret film.

[0010] In a possible implementation, at least two first micro-nanoparticles made of different materials are disposed on at least one surface of the electret substrate.

[0011] The electret film provided in the embodiment of the present application can further improve the charge storage performance of the electret film by setting a plurality of first micro-nanoparticles of different materials on the same surface of the electret substrate, which helps to further improve the surface potential of the electret film.

[0012] In a possible implementation, the at least one first micro-nano particle includes a first non-metallic particle and a first metal layer, and a portion of the first non-metallic particle is disposed inside the first metal layer.

[0013] The electret film provided in the embodiment of the present application can improve the ability of the first micro-nano particles to store charges by using first micro-nano particles composed of first non-metallic particles and a first metal layer, thereby further improving the ability of the electret film to store charges, and further improving the surface potential of the electret film.

[0014] In a possible implementation, at least one first micro-nano particle includes a first body portion and a plurality of first protrusions, and the plurality of first protrusions are disposed on a surface of the first body portion.

[0015] The electret film provided in the embodiment of the present application can increase the effective surface area of ​​the first micro-nano particles by adopting the first main body and the first protrusion, thereby further increasing the effective surface area of ​​the electret film, and further increasing the surface potential of the electret film.

[0016] In a possible implementation, the first hole structure includes a plurality of first grooves, at least one surface of the electret substrate is provided with first grooves, and at least one first groove is used to accommodate the first micro-nanoparticles.

[0017] The electret film provided in the embodiment of the present application can increase the effective area of ​​the electret substrate by setting a first groove on the surface of the electret substrate, thereby improving the charge storage capacity of the electret substrate and further improving the surface potential of the electret film.

[0018] In a possible implementation, the first hole structure further includes at least one first through hole, the at least one first through hole passes through the electret substrate, and the at least one first through hole is used to accommodate the first micro-nanoparticles.

[0019] The electret film provided in the embodiment of the present application increases the effective surface area of ​​the electret film through the first groove and the first through hole, which can reduce the difficulty of setting the first hole structure on the electret substrate while increasing the surface potential of the electret film.

[0020] In a possible implementation, at least two first grooves with different structures are provided on at least one surface of the electret substrate.

[0021] The electret film provided in the embodiment of the present application can not only increase the effective area of ​​the electret substrate but also reduce the difficulty of manufacturing the electret film by arranging multiple first grooves with different structures on the same surface of the electret substrate.

[0022] In a possible implementation, the electret substrate includes an electret film, the first pore structure is disposed in the electret film, and first micro-nano particles are disposed on at least one surface of the electret film.

[0023] The electret film provided in the embodiment of the present application uses an electret film as an electret substrate, which can not only achieve mixing of the first micro-nanoparticles with the electret substrate to increase the effective surface area of ​​the electret film, but also reduce the cost of the electret substrate and thus reduce the cost of the electret film.

[0024] In a possible implementation, the electret substrate includes an electret film, a second pore structure and second micro-nanoparticles, the second pore structure is arranged in the electret film, the second pore structure is used to accommodate the second micro-nanoparticles, and the second micro-nanoparticles are arranged on at least one surface of the electret film.

[0025] The electret film provided in the embodiment of the present application adopts an electret substrate composed of an electret film, a second pore structure and a second micro-nano particle, which can improve the effective surface of the electret substrate and the ability to store charge, thereby further improving the ability of the electret film to store charge, and further improving the surface potential of the electret film.

[0026] In a possible implementation, second micro-nanoparticles of various sizes are disposed on at least one surface of the electret film.

[0027] The electret film provided in the embodiment of the present application can further increase the effective surface area of ​​the electret substrate by disposing first micro-nanoparticles of various sizes on the same surface of the electret film, which helps to further increase the surface potential of the electret film.

[0028] In a possible implementation, at least two second micro-nanoparticles with different structures are disposed on at least one surface of the electret film.

[0029] The electret film provided in the embodiment of the present application can further increase the effective surface area of ​​the electret substrate by arranging a plurality of first micro-nanoparticles with different structures on the same surface of the electret film, which helps to further increase the surface potential of the electret film.

[0030] In a possible implementation, at least two second micro-nanoparticles made of different materials are disposed on at least one surface of the electret film.

[0031] The electret film provided in the embodiment of the present application can further improve the charge storage performance of the electret substrate by arranging a plurality of first micro-nanoparticles of different materials on the same surface of the electret film, which helps to further improve the surface potential of the electret film.

[0032] In a possible implementation, the at least one second micro-nano particle includes a second non-metallic particle and a second metal layer, and a portion of the second non-metallic particle is disposed inside the second metal layer.

[0033] The electret film provided in the embodiment of the present application can improve the ability of the second micro-nano particles to store charges by adopting second micro-nano particles composed of second non-metallic particles and a second metal layer, thereby further improving the ability of the electret substrate to store charges, and further improving the surface potential of the electret film.

[0034] In a possible implementation, at least one second micro-nano particle includes a second body portion and a plurality of second protrusions, and the plurality of second protrusions are disposed on a surface of the second body portion.

[0035] The electret film provided in the embodiment of the present application can increase the effective surface area of ​​the second micro-nano particles by adopting the second micro-nano particles composed of the second main body and the second protrusion, thereby further increasing the effective surface area of ​​the electret substrate, and further increasing the surface potential of the electret film.

[0036] In a possible implementation, the second hole structure includes a plurality of second grooves, and at least one surface of the electret film is provided with second grooves, and at least one second groove is used to accommodate second micro-nanoparticles.

[0037] The electret film provided in the embodiment of the present application can increase the effective area of ​​the electret film by setting a second groove on the surface of the electret film, thereby improving the ability of the electret film to store charges and further improving the surface potential of the electret film.

[0038] In a possible implementation, the second pore structure further includes at least one second through hole, the at least one second through hole penetrates the electret film, and the at least one second through hole is used to accommodate second micro-nanoparticles.

[0039] The electret film provided in the embodiment of the present application increases the effective surface area of ​​the electret substrate through the second groove and the second through hole, which can reduce the difficulty of setting the second hole structure on the electret film while increasing the surface potential of the electret film.

[0040] A second aspect of the present application provides a power generation device, comprising the electret film as described in any one of the first aspects.

[0041] The power generation device provided in the embodiment of the present application adopts the electret film of the first aspect. Since the surface potential of the electret film is high, the power generation efficiency of the power generation device can be improved, and thus the energy collection efficiency can be improved.

[0042] A third aspect of the present application provides an electronic device, comprising the power generation device according to the second aspect.

[0043] The electronic device provided in the embodiment of the present application adopts the power generation device of the second aspect. Since the power generation device has a high energy collection efficiency, the battery life of the electronic device can be improved.

[0044] A fourth aspect of the present application provides a method for preparing an electret film, comprising:

[0045] Obtaining an electret substrate having a first pore structure and an emulsion containing first micro-nanoparticles;

[0046] spraying the emulsion onto at least one surface of the electret substrate;

[0047] Post-treating the electret substrate sprayed with the emulsion to form an un-electret electret film;

[0048] The electret film which has not been electret is electret-electreted.

[0049] In a possible implementation manner, before electret is applied to the non-electret electret film, the method further includes:

[0050] Protective layers are respectively attached to opposite sides of the non-electret electret film. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the structure of a power generation device provided in an embodiment of the present application;

[0052] Figure 2 A cross-sectional view of a first electret film provided in an embodiment of the present application;

[0053] Figure 3A cross-sectional view of a second electret film provided in an embodiment of the present application;

[0054] Figure 4 A cross-sectional view of a third electret film provided in an embodiment of the present application;

[0055] Figure 5 A cross-sectional view of a fourth electret film provided in an embodiment of the present application;

[0056] Figure 6 A cross-sectional view of another first micro-nano particle provided in an embodiment of the present application;

[0057] Figure 7 A front view of another first micro-nano particle provided in an embodiment of the present application;

[0058] Figure 8 for Figure 7 A cross-sectional view of a first micro-nanoparticle in;

[0059] Fig. 9 A cross-sectional view of another electret substrate provided in an embodiment of the present application;

[0060] Fig.10 A flow chart of a method for preparing an electret film provided in an embodiment of the present application;

[0061] Fig.11 for Fig.10 A flowchart of a post-processing in;

[0062] Fig.12 A schematic diagram of an electret operation provided in an embodiment of the present application;

[0063] Fig.13 The figure is an output voltage diagram of a power generation device based on an electret film with first micro-nanoparticles disposed on one side.

[0064] Description of reference numerals:

[0065] 100. Electret film;

[0066] 200. Power generation devices;

[0067] 210, electrode plate; 220, slider;

[0068] 10. Electret substrate;

[0069] 11. Electret film;

[0070] 12. second hole structure; 121. second groove;

[0071] 13. Second micro-nanoparticles;

[0072] 20. first micro-nano particles; 21. first non-metallic particles; 22. first metal layer; 23. first main body; 24. first protrusion;

[0073] 30. first hole structure; 31. first groove; 32. first through hole;

[0074] 51. Protective layer; 52. Bottom electrode; 53. Needle electrode. DETAILED DESCRIPTION

[0075] Usually, in order to improve the battery life of electronic devices such as watches, bracelets, and mobile phones, an energy collection module based on mechanical energy is integrated, which can collect and store the user's exercise energy when the user is exercising. Among them, the energy collection efficiency of the energy collection module is positively correlated with the extension of the battery life of the electronic device. The higher the energy collection efficiency of the energy collection module, the longer the battery life of the electronic device is extended. Therefore, how to improve the energy collection efficiency has become a problem that needs to be solved urgently.

[0076] In view of this, the embodiment of the present application provides an electret film 100, a power generation device 200 and an electronic device, which can increase the effective surface area of ​​the electret film 100, so that the electret film 100 can store more charges, thereby increasing the surface potential of the electret film 100, and further improving the energy collection efficiency, thereby increasing the battery life of the electronic device.

[0077] The electronic device provided in the embodiment of the present application includes a power generation device 200 and a housing, wherein the power generation device 200 is disposed in the housing. When the electronic device is shaken, the power generation device 200 can convert the mechanical energy of the electronic device into electrical energy, thereby realizing energy recovery based on mechanical energy, and thus improving the energy collection efficiency of the electronic device.

[0078] Among them, the electronic devices provided in the embodiments of the present application may include but are not limited to watches, bracelets, mobile phones, headphones, smart glasses, etc.

[0079] Figure 1 This is a schematic diagram of the structure of a power generation device 200 provided in an embodiment of the present application. Figure 1 As shown, the power generation device 200 provided in the embodiment of the present application includes an electret film 100, a slider 220 and two electrode plates 210. The two electrode plates 210 are arranged on one side of the electret film 100 and are spaced apart along a first direction. The slider 220 is arranged on the other side of the electret film 100 and is connected to the electret film 100. The sliding is used to drive the electret film 100 to move along the first direction, so that the power generation device 200 can output current.

[0080] In some embodiments, the power generating device 200 may further include two paper layers, each of which is connected to an electrode plate 210 and disposed between the corresponding electrode plate 210 and the electret film 100 .

[0081] In the embodiment of the present application, since the electret film 100 provided in the embodiment of the present application has a higher surface potential, the power generation efficiency of the power generation device 200 can be improved, and thus the energy collection efficiency can be improved.

[0082] It should be noted that the structure of the power generation device 200 using the electret film 100 provided in the embodiment of the present application is not limited to Figure 1 The structure shown.

[0083] The electret film 100 and the preparation method provided in the embodiments of the present application are described below in conjunction with the accompanying drawings.

[0084] Figure 2 This is a cross-sectional view of the first electret film 100 provided in the embodiment of the present application. Figure 2 As shown, the electret film 100 provided in the embodiment of the present application includes an electret substrate 10, a first pore structure 30 and first micro-nano particles 20. The first pore structure 30 is disposed on the electret substrate 10, and the first pore structure 30 is used to accommodate the first micro-nano particles 20. The first micro-nano particles 20 are disposed on at least one surface of the electret substrate 10.

[0085] By providing the first pore structure 30 for accommodating the first micro-nano particles on the electret substrate 10, the effective surface area of ​​the electret film 100 can be increased, so that more charges can be stored during the electret process, and the surface potential of the electret film 100 can be increased. In addition, by providing the first micro-nano particles 20 on the surface of the electret substrate 10, the effective surface area of ​​the electret film 100 can be further increased on the basis of increasing the effective surface area of ​​the electret film 100 by the first pore structure 30, so that more charges can be further stored during the electret process, and the surface potential of the electret film 100 can be further increased. Therefore, the first pore structure 30 and the first micro-nano particles 20 cooperate with each other, so that the effective surface area of ​​the electret film 100 is increased, so that the surface potential of the electret film 100 can be increased, and the energy collection efficiency can be improved.

[0086] Continue to see Figure 2 As shown, a surface of the electret substrate 10 is provided with first micro-nano particles 20. In other words, along the thickness direction of the electret film 100 (eg Figure 2 The first micro-nano particles 20 are disposed on one side of the electret substrate 10 (in the X direction). However, the first micro-nano particles 20 may be disposed on a plurality of surfaces of the electret substrate 10. Figure 3 This is a cross-sectional view of a second electret film 100 provided in an embodiment of the present application. Figure 3 As shown, the first micro-nano particles 20 are disposed on both surfaces of the electret substrate 10, and the two surfaces of the electret substrate 10 are spaced apart along the thickness direction of the electret substrate 10. In other words, along the thickness direction of the electret film 100, the first micro-nano particles 20 are disposed on opposite sides of the electret substrate 10.

[0087] Therefore, whether the surface of the electret substrate 10 provided with the first micro-nano particles 20 is one or more, the effective surface area of ​​the electret film 100 can be increased, so as to achieve the purpose of increasing the surface potential of the electret film 100. However, the more the number of surfaces provided with the first micro-nano particles 20 in the electret substrate 10 is, the greater the degree of improvement of the effective surface area of ​​the electret film 100 is. Of course, providing the first micro-nano particles 20 on one surface of the electret substrate 10 can reduce the difficulty of manufacturing the electret film 100 while increasing the effective surface area of ​​the electret film 100, which is conducive to reducing the cost of the electret film 100.

[0088] In the embodiment of the present application, there is no limitation on the outer diameter of the first micro-nano particle 20. For example, the outer diameter of the first micro-nano particle 20 is greater than 1 nm and less than 10 um.

[0089] In the embodiment of the present application, any surface of the electret substrate 10 is provided with first micro-nano particles 20 of a certain size, for example Figure 2 As shown, the diameters of the plurality of first micro-nano particles 20 disposed on the same surface of the electret substrate 10 are the same.

[0090] Alternatively, in some possible implementations, at least one surface of the electret substrate 10 may also be provided with first micro-nanoparticles 20 of various sizes. Figure 4 This is a cross-sectional view of a third electret film 100 provided in an embodiment of the present application. Figure 4 As shown, the same surface of the electret substrate 10 is provided with first micro-nano particles 20 of two sizes. Of course, the same surface of the electret substrate 10 can also be provided with first micro-nano particles 20 of more than three sizes.

[0091] It should be noted that, when there are multiple surfaces provided with the first micro-nano particles 20 in the electret substrate 10, each of the multiple surfaces provided with the first micro-nano particles 20 may be provided with the first micro-nano particles 20 of various sizes, or, a portion of the multiple surfaces provided with the first micro-nano particles 20 may be provided with the first micro-nano particles 20 of various sizes. Among them, for the electret film 100 having multiple surfaces and each surface provided with the first micro-nano particles 20 of various sizes, the number of types of sizes of the first micro-nano particles 20 on any two surfaces may be the same or different.

[0092] In summary, the first micro-nano particles 20 of one or more sizes are arranged on the same surface of the electret substrate 10, which can increase the effective surface area of ​​the electret film 100 and achieve the purpose of increasing the surface potential of the electret film 100. However, by arranging the first micro-nano particles 20 of multiple sizes on the same surface of the electret substrate 10, the effective surface area of ​​the electret film 100 can be further increased, which helps to further increase the surface potential of the electret film 100. Of course, the first micro-nano particles 20 of one size are arranged on the same surface of the electret substrate 10, which can also reduce the difficulty of manufacturing the electret film 100 and help improve production efficiency.

[0093] In the embodiments of the present application, Figure 2 As shown, there is only one surface provided with the first micro-nano particles 20, and the structures of the multiple first micro-nano particles 20 provided on the same surface are the same. In other words, the structures of the multiple first micro-nano particles 20 provided on the same surface of the electret substrate 10 are the same.

[0094] Alternatively, in some possible implementations, at least one surface of the electret substrate 10 is provided with at least two first micro-nano particles 20 with different structures. Exemplarily, one surface of the electret substrate 10 is provided with the first micro-nano particles 20, and the one surface is provided with the first micro-nano particles 20 with two structures. Of course, the types of structures of the first micro-nano particles 20 may also be more than two. Alternatively, in some embodiments, two surfaces of the electret substrate 10 are provided with the first micro-nano particles 20, at least one of the two surfaces is provided with the first micro-nano particles 20 with at least two structures, and the two surfaces may be provided with the same number or different numbers of structures of the first micro-nano particles 20.

[0095] In summary, each surface of at least one surface of the electret substrate 10 is provided with the first micro-nano particles 20 having one or two structures, which can increase the effective surface area of ​​the electret film 100 and achieve the purpose of increasing the surface potential of the electret film 100. However, the same surface of the electret substrate 10 is provided with multiple first micro-nano particles 20 having different structures, which can further increase the effective surface area of ​​the electret film 100 and help to further increase the surface potential of the electret film 100.

[0096] It can be understood that at least one surface of the electret substrate 10 is provided with first micro-nanoparticles 20 with at least two structures. Compared with the first micro-nanoparticles 20 with the same structure being provided on the surface, the number of the first micro-nanoparticles 20 can be increased, which can not only further increase the effective surface area of ​​the electret film 100 and thus further increase the surface potential of the electret film 100, but also store more charge and thus further increase the surface potential of the electret film 100.

[0097] In the examples of this application, see Figure 2 As shown, each surface of the electret substrate 10 is provided with a plurality of first micro-nano particles 20 made of the same material.

[0098] Alternatively, in some possible implementations, at least one surface of the electret substrate 10 is provided with at least two first micro-nano particles 20 of different materials. Exemplarily, one surface of the electret substrate 10 is provided with the first micro-nano particles 20, and the one surface is provided with the first micro-nano particles 20 made of two different materials. Of course, more than two first micro-nano particles 20 made of different materials may also be provided. Or in some embodiments, one surface of the electret substrate 10 is provided with the first micro-nano particles 20 made of one material, and the other surface is provided with at least two first micro-nano particles 20 of different materials. Or in some embodiments, multiple surfaces in the electret substrate 10 are provided with at least two first micro-nano particles 20 of different materials.

[0099] In summary, the electret film 100 can achieve the purpose of improving the surface potential of the electret film 100 by arranging one or more first micro-nano particles 20 of different materials on the surface. However, by arranging a plurality of first micro-nano particles 20 of different materials on the same surface of the electret substrate 10, the charge storage performance of the electret film 100 can be further improved, which helps to further improve the surface potential of the electret film 100.

[0100] In the embodiment of the present application, there is no limitation on the material of the first micro-nano particles 20. For example, the material of the first micro-nano particles 20 may include but is not limited to polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polypropylene, polyperfluoroethylene propylene, soluble polytetrafluoroethylene, polyvinylidene fluoride silica, etc.

[0101] In the embodiment of the present application, the first hole structure 30 includes a plurality of first grooves 31, and at least one surface of the electret substrate 10 is provided with the first grooves 31, for example Figure 2 As shown, one surface of the electret substrate 10 is provided with a plurality of first grooves 31, or as shown, two surfaces of the electret substrate 10 may also be provided with a plurality of first grooves 31. At least one first groove 31 is used to accommodate the first micro-nano particles 20, for example Figure 2 As shown, some of the first grooves 31 in the plurality of first grooves 31 are used to accommodate the first micro-nano particles 20. Of course, in some embodiments, each of the plurality of first grooves 31 may also be used to accommodate the first micro-nano particles 20.

[0102] Accordingly, the electret film 100 can increase the effective area of ​​the electret substrate 10 by providing the first groove 31 on the surface of the electret substrate 10 , thereby increasing the charge storage capability of the electret substrate 10 and further increasing the surface potential of the electret film 100 .

[0103] In the embodiment of the present application, the arrangement of the plurality of first grooves 31 disposed on the same surface of the electret substrate 10 is disordered, in other words, the plurality of first grooves 31 disposed on the same surface of the electret substrate 10 are randomly distributed. In this way, the number of the first grooves 31 can be increased, which helps to further increase the effective surface area of ​​the electret substrate 10.

[0104] In the embodiment of the present application, the sizes of at least two first grooves 31 arranged on the same surface of the electret substrate 10 are different, which can not only increase the number of first grooves 31 arranged on the same surface of the electret substrate 10, thereby further increasing the effective surface area of ​​the electret substrate 10, but also increase the number of first micro-nanoparticles 20 accommodated in the first grooves 31, thereby increasing the number of first micro-nanoparticles 20, which helps to further increase the effective surface area of ​​the electret film 100.

[0105] When the first groove 31 is used to accommodate the first micro-nano particles 20, the first groove 31 can accommodate at least part of the first micro-nano particles 20. In other words, the first micro-nano particles 20 can be partially or completely disposed inside the first groove 31. In addition, one first groove 31 can be used to accommodate one or more first micro-nano particles 20. Therefore, at least one of the plurality of first grooves 31 of the electret film 100 is used to accommodate one or more first micro-nano particles 20.

[0106] It is understandable that the size of the first micro-nanoparticle 20 may be larger than the inner diameter of the first groove 31 , or the size of part of the first micro-nanoparticle 20 may be smaller than the inner diameter of the first groove 31 , or the size of the first micro-nanoparticle 20 may be larger than the inner diameter of the first groove 31 .

[0107] Continue to see Figure 2 As shown, the transition between two adjacent first grooves 31 can be a smooth transition, a steep transition, etc.

[0108] It should be noted that, in the embodiment of the present application, the first groove 31 can be understood as a groove provided on the surface of the electret substrate 10, so that the surface of the electret substrate 10 is bumpy, thereby increasing the effective surface area of ​​the electret substrate 10. In addition, there is no limitation on how to form the first groove 31 on the surface of the electret substrate 10. For example, in terms of process, a concave surface can be made on the flat surface of the electret substrate 10 to form the first groove 31, or a convex surface can be made on the flat surface of the electret substrate 10 to form the first groove 31, or a concave surface and a convex surface can be made on the flat surface of the electret substrate 10 at the same time to form the first groove 31.

[0109] when Figure 2 When the electret film 100 is applied to the power generation device 200, the side of the electret film 100 provided with the first micro-nano particles 20 is preferably close to the electrode plate 210, which can further improve the use effect. Figure 2 The other side of the electret film 100 where the first micro-nano particles 20 are not provided can also be close to the electrode plate 210, which can also meet the use requirements.

[0110] In some possible implementations, at least one surface of the electret substrate 10 is provided with at least two first grooves 31 with different structures, for example Figure 2 As shown, a first groove 31 is disposed on one surface of the electret substrate 10 , and a plurality of first grooves 31 with different structures are disposed on the one surface.

[0111] Alternatively, in some possible implementations, at least one surface of the electret substrate 10 may also be provided with a plurality of first grooves 31 (not shown in the figure) having the same structure.

[0112] In summary, at least one surface of the electret substrate 10 is provided with a plurality of first grooves 31 of the same structure or at least two first grooves 31 of different structures, which can increase the effective surface area of ​​the electret substrate 10, so as to increase the surface potential of the electret film 100. However, by providing a plurality of first grooves 31 of different structures on the same surface of the electret substrate 10, the electret film 100 can further increase the effective area of ​​the electret substrate 10, and can also reduce the manufacturing difficulty of the electret film 100.

[0113] It should be noted that, in addition to being formed by a plurality of first grooves 31 , the first hole structure 30 may also be other structures.

[0114] Figure 5 This is a cross-sectional view of a fourth electret film 100 provided in an embodiment of the present application. Figure 5 and Figure 2 The difference is that the first hole structure 30 can also include at least one first through hole 32, at least one first through hole 32 penetrates the electret substrate 10, and at least one first through hole 32 is used to accommodate the first micro-nano particles 20. Exemplarily, as shown in the figure, the first hole structure 30 includes a plurality of first grooves 31 and two first through holes 32, both of which penetrate the electret substrate 10, and each of which is used to accommodate the first micro-nano particles 20.

[0115] Accordingly, the electret film 100 increases the effective surface area of ​​the electret film 100 through the first groove 31 and the first through hole 32, which can reduce the difficulty of setting the first hole structure 30 on the electret substrate 10 while increasing the surface potential of the electret film 100. In other words, it can reduce the manufacturing difficulty.

[0116] When there are multiple first through holes 32, the structures of the multiple first through holes 32 may be the same or at least partially different. In addition, the sizes of the multiple first through holes 32 may be the same or at least partially different.

[0117] The inner diameter of the first through hole 32 may be smaller than or equal to the outer diameter of the first micro-nano particle 20, so that part of the first micro-nano particle 20 is disposed inside the first through hole 32. Of course, the inner diameter of the first through hole 32 may also be larger than the outer diameter of the first micro-nano particle 20, so that the first micro-nano particle 20 is disposed inside the first through hole 32, or a plurality of first micro-nano particles 20 are disposed inside the first through hole 32.

[0118] In the embodiment of the present application, there is no limitation on the ratio of the first through hole 32 to the first groove 31. For example, in a certain area of ​​the electret film 100, the ratio of the first groove 31 is greater than the ratio of the first through hole 32.

[0119] The first hole structure 30 is Figure 2 and Figure 5 In addition to the two structures shown in the figure, in some possible implementations, the first hole structure 30 may also include a plurality of first through holes 32 (not shown in the figure), and the plurality of first through holes 32 penetrate the electret substrate 10 and may also accommodate the first micro-nanoparticles 20, so as to achieve the purpose of increasing the effective surface of the electret film 100.

[0120] In the embodiments of this application, see Figure 2 As shown, each first micro-nano particle 20 in the electret film 100 is a spherical structure. Of course, the structure of the first micro-nano particle 20 is not limited to the spherical structure. However, using the first micro-nano particle 20 with a spherical structure can reduce the difficulty of manufacturing the first micro-nano particle 20.

[0121] It should be noted that the first micro-nano particles 20 are Figure 2 In addition to the spherical structure shown, other structures are also possible.

[0122] Figure 6 This is a cross-sectional view of another first micro-nano particle 20 provided in an embodiment of the present application. In some possible implementations, see Figure 6 As shown, at least one first micro-nano particle 20 includes a first non-metallic particle 21 and a first metal layer 22, and a portion of the first non-metallic particle 21 is disposed inside the first metal layer 22. In other words, a portion of the surface of the first non-metallic particle 21 is covered with the first metal layer 22.

[0123] Accordingly, by using the first micro-nanoparticles 20 composed of the first non-metallic particles 21 and the first metal layer 22, the charge storage capacity of the first micro-nanoparticles 20 can be improved, thereby further improving the charge storage capacity of the electret film 100, and further improving the surface potential of the electret film 100.

[0124] Continue to see Figure 6 As shown, the first non-metallic particles 21 are spherical. Of course, the first non-metallic particles 21 may also be other structures.

[0125] Continue to see Figure 6 As shown, the first metal layer 22 covers half of the surface of the first non-metallic particle 21 . Of course, the area of ​​the first metal layer 22 covering the first non-metallic particle 21 may be more or less than half of the surface of the first non-metallic particle 21 .

[0126] Figure 7 A front view of another first micro-nano particle 20 provided in an embodiment of the present application, Figure 8 for Figure 7In some possible implementations, see Figure 7 and Figure 8 As shown, at least one first micro-nano particle 20 includes a first body portion 23 and a plurality of first protrusions 24, and the plurality of first protrusions 24 are arranged on the surface of the first body portion 23. It can be understood that the first micro-nano particle 20 composed of the plurality of first protrusions 24 and the first body portion 23 is similar to a hedgehog spherical structure.

[0127] Accordingly, by using the first micro-nano particles 20 composed of the first body portion 23 and the first protrusion portion 24, the effective surface area of ​​the first micro-nano particles 20 can be increased, thereby further increasing the effective surface area of ​​the electret film 100, and further increasing the surface potential of the electret film 100.

[0128] In the embodiment of the present application, the structure of the first protrusion 24 is not limited here. For example, Figure 7 As shown, the first protrusion 24 may be a columnar structure.

[0129] It should be noted that when the electret film 100 is provided with a first micro-nano particle 20 having a structure, the structure of the first micro-nano particle 20 may include but is not limited to: Figure 2 , Figure 6 and Figure 7 In addition, when at least two first micro-nano particles 20 with different structures are provided in the electret film 100, they may include but are not limited to: Figure 2 , Figure 6 and Figure 7 The first micro-nano particles 20 may be a combination of at least two of the above structures, or a combination of the first micro-nano particles 20 of other structures.

[0130] In some possible implementations, the electret substrate 10 includes an electret film 11, the first pore structure 30 is disposed on the electret film 11, and at least one surface of the electret film 11 is provided with first micro-nano particles 20. Figure 2 As shown, the first pore structure 30 is disposed on a surface of the electret film 11 , and the first micro-nano particles 20 are disposed on the surface.

[0131] Accordingly, the electret film 100 uses the electret film 11 as the electret substrate 10, which can not only achieve mixing of the first micro-nanoparticles 20 with the electret substrate 10 to increase the effective surface area of ​​the electret film 100, but also reduce the cost of the electret substrate 10 and thus reduce the cost of the electret film 100.

[0132] There is no limitation on the specific types of the electret film 11. The electret film 11 may include, but is not limited to, polytetrafluoroethylene, fluorinated ethylene propylene copolymer, polypropylene, polyperfluoroethylene propylene, soluble polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl butyral, polystyrene, polyester, polyvinyl acetate, nylon 6, nylon 66, polyvinyl alcohol, polymethyl methacrylate, polyaniline, polyethylene oxide, polyvinyl pyrrolidone, polyacrylonitrile, polycaprolactone, polyethylene terephthalate, polytetrafluoroethylene, polyethylene glycol, polyurethane, polysulfone, polyethersulfone, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-tetrafluoroethylene-perfluoromethyl vinyl ether or polyvinylidene fluoride-trifluorochloroethylene, etc.

[0133] It should be noted that, in addition to being made of the electret film 11 , the electret substrate 10 may also be other structures.

[0134] Fig. 9 A cross-sectional view of another electret substrate 10 provided in an embodiment of the present application. In some possible implementations, see Fig. 9 As shown, the electret substrate 10 may include an electret film 11, a second pore structure 12 and second micro-nano particles 13. The second pore structure 12 is provided in the electret film 11, the second pore structure 12 is used to accommodate the second micro-nano particles 13, and the second micro-nano particles 13 are provided on at least one surface of the electret film 11.

[0135] Correspondingly, the electret film 100 adopts the electret substrate 10 composed of the electret film 11, the second pore structure 12 and the second micro-nanoparticles 13, which can improve the effective surface and charge storage capacity of the electret substrate 10, thereby further improving the charge storage capacity of the electret film 100, and further improving the surface potential of the electret film 100.

[0136] Continue to see Fig. 9 As shown, one surface of the electret film 11 is provided with the second micro-nano particles 13. In other words, along the thickness direction of the electret film 100, one side of the electret film 11 is provided with the second micro-nano particles 13. Of course, in some embodiments, multiple surfaces of the electret film 11 may also be provided with the second micro-nano particles 13, for example, along the thickness direction of the electret film 100, two opposite surfaces of the electret film 11 are provided with the second micro-nano particles 13.

[0137] It should be noted that the more surfaces of the electret film 11 are provided with the second micro-nano particles 13, the greater the degree of improvement of the effective surface area of ​​the electret substrate 10. However, the second micro-nano particles 13 are provided on one surface of the electret film 11, which can reduce the difficulty of manufacturing the electret substrate 10 and is conducive to reducing the cost of the electret substrate 10.

[0138] In the embodiments of the present application, Fig. 9 As shown, the surface of the electret film 11 is provided with second micro-nano particles 13 of the same size.

[0139] However, in some possible implementations, at least one surface of the electret film 11 may also be provided with second micro-nano particles 13 of various sizes. Exemplarily, one surface of the electret film 11 may be provided with second micro-nano particles 13 of at least two sizes (not shown in the figure, which can be understood by referring to the first micro-nano particles 20 of various sizes provided in the electret film 100). Or in some embodiments, both surfaces of the electret film 11 may also be provided with second micro-nano particles 13 of at least two sizes.

[0140] In summary, the surface of the electret film 11 is provided with the second micro-nano particles 13 of one size or multiple sizes, which can increase the effective surface area of ​​the electret substrate 10, thereby achieving the purpose of increasing the surface potential of the electret film 100. However, by providing the first micro-nano particles 20 of multiple sizes on the same surface of the electret film 11, the effective surface area of ​​the electret substrate 10 can be further increased, which helps to further increase the surface potential of the electret film 100.

[0141] In some possible implementations, at least one surface of the electret film 11 may be provided with at least two second micro-nanoparticles 13 with different structures.

[0142] Accordingly, the electret film 100 can further increase the effective surface area of ​​the electret substrate 10 by disposing a plurality of first micro-nanoparticles 20 with different structures on the same surface of the electret film 11 , which helps to further increase the surface potential of the electret film 100 .

[0143] When there are multiple surfaces of the electret film 11 provided with the second micro-nano particles 13, in addition to being provided with at least two second micro-nano particles 13 with different structures on each of the multiple surfaces, at least two second micro-nano particles 13 with different structures may also be provided on some of the multiple surfaces.

[0144] It should be noted that each surface of the electret film 11 on which the second micro-nano particles 13 are disposed may also be provided with second micro-nano particles 13 of a certain structure, which can reduce the cost of the second micro-nano particles 13 and thus reduce the cost of the electret substrate 10 .

[0145] In some possible implementations, at least one surface of the electret film 11 may be provided with at least two second micro-nanoparticles 13 made of different materials.

[0146] Accordingly, the electret film 100 can further improve the charge storage performance of the electret substrate 10 by disposing a plurality of first micro-nanoparticles 20 of different materials on the same surface of the electret film 11 , which helps to further improve the surface potential of the electret film 100 .

[0147] When there are multiple surfaces of the electret film 11 provided with the second micro-nanoparticles 13, at least two second micro-nanoparticles 13 of different materials may be provided on each surface, or at least two second micro-nanoparticles 13 of different materials may be provided on some of the multiple surfaces.

[0148] It should be noted that, in addition to being provided with at least two second micro-nano particles 13 of different materials, the surface of the electret film 11 on which the second micro-nano particles 13 are provided may also be provided with a plurality of second micro-nano particles 13 of the same material, in other words, the plurality of second micro-nano particles 13 provided on the same surface of the electret film 11 may be provided with the same material. In this way, the purpose of increasing the surface potential of the electret film 100 can also be achieved.

[0149] In the embodiment of the present application, there is no limitation on the structure of the second micro-nano particles 13. Several second micro-nano particles 13 with different structures are described below.

[0150] In some possible implementations, such as Fig. 9 As shown, at least one second micro-nano particle 13 is a spherical structure. In other words, the second micro-nano particle 13 is a spherical body.

[0151] In some possible implementations, at least one second micro-nano particle 13 includes a second non-metallic particle and a second metal layer, and part of the second non-metallic particle is disposed inside the second metal layer. In other words, part of the surface of the second non-metallic particle is covered with the second metal layer.

[0152] Accordingly, the second micro-nanoparticles 13 composed of the second non-metallic particles and the second metal layer can improve the charge storage capacity of the second micro-nanoparticles 13 , thereby further improving the charge storage capacity of the electret substrate 10 , and further improving the surface potential of the electret film 100 .

[0153] It can be understood that the structure of the second micro-nano particles 13 composed of the second non-metallic particles and the second metal layer is similar to that in the above content. Figure 6 The structure shown.

[0154] It should be noted that the second non-metallic particles can be spherical, and of course, the second non-metallic particles can also be other structures. In addition, the second metal layer covers half of the surface of the second non-metallic particles, and of course, the area covered by the second metal layer on the second non-metallic particles can be more or less than half of the surface of the second non-metallic particles.

[0155] In some possible implementations, at least one second micro-nano particle 13 includes a second body portion and a plurality of second protrusions, and the plurality of second protrusions are arranged on the surface of the second body portion. It is understandable that the first micro-nano particle 20 composed of the plurality of second protrusions and the second body portion is similar to a hedgehog spherical structure.

[0156] Accordingly, the second micro-nano particles 13 composed of the second body portion and the second protrusion portion can increase the effective surface area of ​​the second micro-nano particles 13 , thereby further increasing the effective surface area of ​​the electret substrate 10 , and further increasing the surface potential of the electret film 100 .

[0157] In the embodiment of the present application, there is no limitation on the structure of the second protrusion. For example, the second protrusion may be a columnar structure.

[0158] It can be understood that the second micro-nano particles 13 formed by the second main body and the plurality of second protrusions are the same as those in the above content. Figure 7 and Figure 8 The structure shown.

[0159] It should be noted that when the electret substrate 10 is provided with the second micro-nano particles 13 of one structure, the structure of the second micro-nano particles 13 may include but is not limited to one of the above three structures. In addition, when the electret substrate 10 is provided with the second micro-nano particles 13 of at least two structures, it may include but is not limited to a combination of at least two of the above three structures.

[0160] In some possible implementations, the second pore structure 12 includes a plurality of second grooves 121. At least one surface of the electret film 11 is provided with a second groove 121. At least one second groove 121 is used to accommodate the second micro-nano particles 13. Fig. 9 As shown, a plurality of second grooves 121 are disposed on a surface of the electret film 11 , and some of the plurality of second grooves 121 are used to accommodate the second micro-nano particles 13 . Of course, each of the plurality of second grooves 121 can also be used to accommodate the second micro-nano particles 13 .

[0161] Accordingly, by providing the second groove 121 on the surface of the electret film 11 , the effective area of ​​the electret film 11 can be increased, thereby improving the charge storage capability of the electret film 11 and further improving the surface potential of the electret film 100 .

[0162] In the embodiment of the present application, the arrangement of the plurality of second grooves 121 disposed on the same surface of the electret film 11 is disordered, in other words, the plurality of second grooves 121 disposed on the same surface of the electret film 11 are randomly distributed. In this way, the number of the second grooves 121 can be increased, which helps to further increase the effective surface area of ​​the electret film 11.

[0163] In addition, in the embodiment of the present application, the sizes of at least two second grooves 121 arranged on the same surface of the electret film 11 are different, which can not only increase the number of second grooves 121 arranged on the same surface of the electret film 11, thereby further increasing the effective surface area of ​​the electret film 11, but also increase the number of second micro-nanoparticles 13 accommodated in the second grooves 121, thereby increasing the number of second micro-nanoparticles 13, which helps to further increase the effective surface area of ​​the electret substrate 10.

[0164] When the second groove 121 is used to accommodate the second micro-nano particles 13, the second groove 121 can accommodate at least part of the second micro-nano particles 13. In other words, the second micro-nano particles 13 can be partially or completely disposed inside the second groove 121. In addition, one second groove 121 can be used to accommodate one or more second micro-nano particles 13. Therefore, at least one of the plurality of second grooves 121 of the electret substrate 10 is used to accommodate one or more second micro-nano particles 13.

[0165] Continue to see Fig. 9 As shown, the transition between two adjacent second grooves 121 can be a smooth transition, a steep transition, etc.

[0166] It should be noted that, in the embodiment of the present application, the second groove 121 can be understood as a groove provided on the surface of the electret film 11, so that the surface of the electret film 11 is bumpy, thereby increasing the effective surface area of ​​the electret film 11. In addition, there is no limitation on how to form the second groove 121 on the surface of the electret film 11. For example, in terms of process, a concave surface can be made on the flat surface of the electret film 11 to form the second groove 121, or a convex surface can be made on the flat surface of the electret film 11 to form the second groove 121, or a concave surface and a convex surface can be made on the flat surface of the electret film 11 at the same time to form the second groove 121.

[0167] In some possible implementations, at least one surface of the electret film 11 is provided with at least two second grooves 121 with different structures, for example Fig. 9 As shown, a second groove 121 is disposed on one surface of the electret film 11 , and a plurality of second grooves 121 with different structures are disposed on the one surface.

[0168] Alternatively, in some possible implementations, at least one surface of the electret film 11 may also be provided with a plurality of second grooves 121 (not shown in the figure) having the same structure.

[0169] In summary, at least one surface of the electret film 11 is provided with a plurality of second grooves 121 with the same structure or at least two second grooves 121 with different structures, which can increase the effective surface area of ​​the electret film 11, so as to increase the surface potential of the electret film 100. However, by providing a plurality of second grooves 121 with different structures on the same surface of the electret film 11, the electret film 100 can further increase the effective area of ​​the electret substrate 10, and can also reduce the manufacturing difficulty of the electret film 100.

[0170] When the second groove 121 is used to accommodate the second micro-nano particle 13, the second micro-nano particle 13 may be partially disposed inside the second groove 121, or the second micro-nano particle 13 may also be disposed inside the second groove 121. In other words, the outer diameter of the second micro-nano particle 13 may be greater than or less than the inner diameter of the second groove 121, or the outer diameter of the second micro-nano particle 13 may also be equal to the inner diameter of the second groove 121.

[0171] It should be noted that, in addition to being formed by a plurality of second grooves 121, the second hole structure 12 may also be other structures. In some possible implementations, in addition to including a plurality of second grooves 121, the second hole structure 12 may also include at least one second through hole. Among them, at least one second through hole penetrates the electret film 11, and at least one second through hole is used to accommodate the second micro-nanoparticles 13. Accordingly, the electret film 100 increases the effective surface area of ​​the electret substrate 10 through the second grooves 121 and the second through holes, and the difficulty of setting the second hole structure 12 on the electret film 11 can be reduced under the premise of increasing the surface potential of the electret film 100.

[0172] Or in some possible implementations, the second hole structure 12 may also include a plurality of second through holes, the plurality of second through holes penetrate the electret film 11, and at least one second through hole is used to accommodate the second micro-nano particles 13. Accordingly, the second hole structure 12 composed of a plurality of second through holes may also accommodate the second micro-nano particles 13, thereby achieving the purpose of increasing the effective surface of the electret substrate 10.

[0173] For the relationship between the inner diameter of the second through hole and the size of the second micro-nano particle 13 , reference may be made to the description of the inner diameter of the first through hole 32 and the outer diameter of the first micro-nano particle 20 in the above content.

[0174] When the electret film 100 adopts the electret substrate 10 composed of the electret film 11, the second pore structure 12 and the second micro-nano particles 13, the structure of at least part of the first micro-nano particles 20 and at least part of the second micro-nano particles 13 can be the same, or the structure of the first micro-nano particles 20 and the second micro-nano particles 13 are different. In addition, the material of at least part of the first micro-nano particles 20 can also be the same as the material of at least part of the second micro-nano particles 13, or the material of the first micro-nano particles 20 and the second micro-nano particles 13 are different. In addition, the size of the first micro-nano particles 20 and the second micro-nano particles 13 can also be different, or the size of at least part of the first micro-nano particles 20 is the same as the size of at least part of the second micro-nano particles 13.

[0175] It should be noted that the material of the second micro-nano particles 13 can refer to the material of the first micro-nano particles 20 in the above content. In addition, the structure of the second micro-nano particles 13 can also refer to the structure of the first micro-nano particles 20 in the above content. The structure of the second pore structure 12 can also refer to the structure of the first pore structure 30 in the above content.

[0176] Fig.10 Flow chart of a method for preparing an electret film 100 provided in an embodiment of the present application. The present application also provides a method for preparing an electret film 100, see Fig.10 As shown, the specific steps include:

[0177] S1 . Obtain an electret substrate 10 having a first pore structure 30 and an emulsion containing first micro-nanoparticles 20 .

[0178] In the embodiment of the present application, there is no limitation on how to set the first hole structure 30 on the electret substrate 10. For example, the surface of the electret substrate 10 can be processed by etching, fiber, porous and other operations to form the first hole structure 30 on the electret substrate 10.

[0179] The specific composition of the emulsion is not limited here. For example, the first micro-nano particles 20 and deionized water can be mixed in a certain proportion to obtain the emulsion.

[0180] S2, spraying the emulsion onto at least one surface of the electret substrate 10.

[0181] Specifically, the first micro-nano particles 20 made of one material or the first micro-nano particles 20 made of multiple materials may be sprayed onto at least one surface of the electret substrate 10 , so that the first micro-nano particles 20 are mixed with the electret substrate 10 having the first pore structure 30 .

[0182] S3 , post-treating the electret substrate 10 sprayed with the emulsion to form a non-electret electret film 100 .

[0183] Specifically, by post-processing the electret substrate 10 sprayed with the emulsion, the first micro-nano particles 20 can be combined with the electret substrate 10 to form a non-electret electret film 100 .

[0184] Fig.11 for Fig.10 In some embodiments, see Fig.11 As shown, post-processing the electret substrate 10 sprayed with the emulsion may include the following steps:

[0185] S31. Vacuuming. S32. Evaporation. S33. Ultrasound. S34. Drying.

[0186] It should be noted that, in some embodiments, steps S31 to S33 may be removed. Alternatively, in some embodiments, one of steps S31 to S3 and step S34 may be adopted. Alternatively, in some embodiments, two of steps S31 to S3 and step S34 may be adopted. When at least one of steps S31 to S3 is present, the surface potential of the electret film 100 may be further increased.

[0187] S4, electret the electret film 100 which has not been electret.

[0188] Fig.12 Schematic diagram of an electret operation provided in an embodiment of the present application. Exemplarily, the un-electret electret film 100 is electret by corona discharge. Fig.12 As shown, a negative voltage is applied to the needle-shaped electrode 53, and the non-electret electret film 100 is placed on the bottom electrode 52 at a certain distance from the needle tip of the needle-shaped electrode 53, and the non-electret electret film 100 is discharged and electret.

[0189] It should be noted that the number of the needle-shaped electrodes 53 may be plural.

[0190] In some possible implementations, before electret film 100 without electret is electreted, the method for preparing electret film 100 may further include:

[0191] S5. Attaching the protective layers 51 to two opposite sides of the non-electret electret film 100 respectively.

[0192] By attaching the protective layer 51 to the opposite sides of the non-electret electret film 100, the working surface of the heating platform can be prevented from being damaged during the electret process. The specific material of the protective layer 51 is not limited here, for example, it can be a polytetrafluoroethylene tape.

[0193] It should be noted that the number of electret films 100 applied to the power generation device 200 may be one or more. Among them, when the number of electret films 100 is multiple, multiple electret films 100 are stacked. Multiple electret films 100 can be stacked in the process of preparing the electret film 100, or multiple electret films 100 can also be stacked after each electret film 100 is prepared, which can depend on the structure of each electret film 100 to be stacked. Exemplarily, when the power generation device 200 uses an electret film 100 with first micro-nano particles 20 on one side, the electret substrates 10 of two electret films 100 can be stacked first during the preparation process, and then two layers of stacked electret films 100 are obtained through spraying, electret and other operations. Alternatively, an electret film 100 with the first micro-nano particles 20 disposed on one side may be manufactured separately, and then two electret films 100 are stacked, wherein the sides of the two electret films 100 not disposed with the first micro-nano particles 20 are in contact with each other.

[0194] The method for preparing the electret film 100 is described below by taking a specific example of preparing the electret film 100 .

[0195] Embodiment 1:

[0196] First, obtain an electret substrate 10 having a first pore structure 30, and the electret substrate 10 can be an electret film 11 made of polytetrafluoroethylene (PTFE). In addition, prepare a PTFE emulsion containing first micro-nanoparticles 20: take 1 mL of PTFE emulsion, add deionized water to 4.5 mL, shake evenly, and pipette into a spray gun. The volume ratio of PTFE emulsion to deionized water is not limited to 1:4.5. The PTFE emulsion refers to an emulsion obtained by mixing the first micro-nanoparticles 20 made of polytetrafluoroethylene with deionized water.

[0197] Then, a layer of PTFE emulsion is sprayed on one surface of the electret substrate 10 with a nozzle, and then placed in an oven at a first temperature for drying for a first time to form a non-electret electret film 100. There is no limitation on the first temperature and the first time. For example, the first temperature may be 60 degrees Celsius, and of course, the first temperature may be lower or higher than 60 degrees Celsius, and the first time may be 10 minutes, and of course, the first time may be more or less than 10 minutes.

[0198] The protective layers 51 are respectively attached to opposite sides of the non-electret electret film 100 to form a sandwich film with a sandwich structure, wherein the protective layer 51 can be a polytetrafluoroethylene tape.

[0199] The sandwich film of "protective layer 51 / un-electret electret film 100 / protective layer 51" is cut into a size of 2.5cm×2.5cm and pasted on a 2.5cm×2.5cm circuit board, which is used as the bottom electrode 52 of corona discharge and is connected to the ground of the high-voltage power supply. The circuit board with the sandwich film is placed on a heating table at a temperature of 250°C with the side with the sandwich film facing up, and then the needle-shaped electrode 53 connected to the negative electrode of the high-voltage power supply is fixed directly above the sandwich film, and the distance from the needle tip of the needle-shaped electrode 53 to the sandwich film is controlled to be 2cm, and the electret operation is performed. Among them, the temperature of the heating table can also be higher or lower than 250°C, and the distance from the needle-shaped electrode 53 to the sandwich film can also be greater or less than 2cm.

[0200] The specific operation of electret is as follows: First, preheat the sandwich film with the high-voltage power supply turned off. After the surface temperature of the sandwich film reaches a stable state, turn on the high-voltage power supply and perform corona discharge for 1 minute. Then turn off the high-voltage power supply and let the sandwich film stand on the heating table for thermal annealing. After 1 minute, turn on the high-voltage power supply again and perform corona discharge for 1 minute. Repeat the "thermal annealing-corona discharge" operation 3 times, so that the cumulative discharge time is 5 minutes. After the last corona discharge, directly remove the sandwich film and cut it into a suitable size. Finally, stick the electret film 100 to the bottom of the slider 220, with the side of the electret film 100 with a negative potential facing away from the slider 220 to form a Figure 1 The power generation device 200 shown in the figure is cut into an electret film 100 with an area of ​​2.5 cm×2.5 cm. The initial surface potential of the electret film 100 with an area of ​​2.5 cm×2.5 cm is about -2.4 kV. After being cut into small discs with a diameter of 8 mm, the surface potential is -0.24 kV. Figure 1 After the power generation device 200 is shown, the output voltage is 30V (such as Fig.13 ). Among them, Fig.13FIG. 4 is an output voltage diagram of a power generation device 200 based on an electret film 100 with first micro-nano particles 20 disposed on one side thereof.

[0201] In the process of electret charging, the output of the high-voltage power supply is always set to -15kV, and the heating stage remains in working state. In the process of electret charging, the output of the high-voltage power supply may also be greater than or less than -15kV. In addition, in the process of electret charging, the time of each corona discharge may also be more than or less than 1 minute. In addition, the cumulative time of corona discharge may also be more than or less than 5 minutes. In addition, the time of thermal annealing may also be more than or less than 1 minute.

[0202] Embodiment 2:

[0203] The difference between Example 2 and Example 1 is that the emulsion containing the first micro-nano particles 20 is sprayed on both surfaces of the electret substrate 10, so that the first micro-nano particles 20 are arranged on both sides of the electret substrate 10, and more first micro-nano particles 20 can be mixed. The specific spraying process can be: spraying the emulsion containing the first micro-nano particles 20 for 30 seconds, then putting it into a 60°C oven for drying, and spraying each of the two opposite surfaces of the electret substrate 10 three times. Among them, the time for spraying the dispersion of the first micro-nano particles 20 can also be more than or less than 30 seconds, and the time in the oven can also be lower or higher than 60°C.

[0204] The electret film 100 after electret charging is cut into corresponding sizes, for example, the initial surface potential of the electret film 100 with an area of ​​2.5cm×2.5cm is -2.4kV. After being cut into small discs with a diameter of 8mm, the surface potential is -0.24kV. After it is prepared into a power generation device 200, the output voltage is also about 30V, which is close to the output voltage of the power generation device 200 in Example 1.

[0205] Embodiment 3:

[0206] The difference between Example 3 and Example 1 is that since the electret film 100 mixed with the first micro-nano particles by spraying has a high initial potential (-2.5kV), but a high initial drop rate, in order to eliminate the reason that part of the water in the sprayed emulsion has not been dried, the drop rate can be reduced by extending the drying time.

[0207] Exemplarily, take 2.5mL of PTFE emulsion in a beaker, add deionized water to 20mL, and stir to mix evenly. Spray a layer of PTFE emulsion on one surface of the electret substrate 10 with a spray gun, and bake it in a 100°C oven for 10 minutes; repeat the above spraying and drying steps once again; after the third spraying is completed, put it in an oven and bake it for 1 hour. After completion, take out the un-electret electret film 100, attach the protective layer 51 on both sides, and then prepare the electret film 100 after electret, and its surface potential is measured to be -2.5kV, -2.9kV, and -2.8kV, respectively. The surface potential on the second day was -1.9kV, -2.0kV, and 1.8kV. Compared with the previous drop to -0.5kV on the second day, the rate of decline has slowed down.

[0208] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0209] In the embodiments of the present application, the devices or elements referred to or implied must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise precisely and specifically specified.

[0210] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0211] The term "plurality" in this article refers to two or more than two. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship; in a formula, the character " / " indicates that the previous and next associated objects are in a "division" relationship.

[0212] It should be understood that the various numerical numbers involved in the embodiments of the present application are only used for the convenience of description and are not used to limit the scope of the embodiments of the present application.

[0213] It can be understood that in the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. An electret film, characterized in that: It includes an electret substrate, a first pore structure and first micro-nano particles; The first hole structure is disposed on the electret substrate, and the first hole structure is used to accommodate the first micro-nano particles; The first micro-nano particles are disposed on at least one surface of the electret substrate.

2. The electret film according to claim 1, characterized in that: The first micro-nano particles of various sizes are disposed on at least one surface of the electret substrate.

3. The electret film according to claim 1 or 2, characterized in that: At least two first micro-nano particles with different structures are disposed on at least one surface of the electret substrate.

4. The electret film according to any one of claims 1 to 3, characterized in that: At least two first micro-nano particles made of different materials are disposed on at least one surface of the electret substrate.

5. The electret film according to any one of claims 1 to 4, characterized in that: At least one of the first micro-nano particles includes a first non-metallic particle and a first metal layer, and a portion of the first non-metallic particle is disposed inside the first metal layer.

6. The electret film according to any one of claims 1 to 5, characterized in that: At least one of the first micro-nano particles includes a first body portion and a plurality of first protrusions, and the plurality of first protrusions are arranged on the surface of the first body portion.

7. The electret film according to any one of claims 1 to 6, characterized in that: The first hole structure includes a plurality of first grooves. At least one surface of the electret substrate is provided with the first grooves, and at least one of the first grooves is used to accommodate the first micro-nano particles.

8. The electret film according to claim 7, characterized in that: The first hole structure further includes at least one first through hole, and the at least one first through hole penetrates the electret substrate. The at least one first through hole is used to accommodate the first micro-nano particles.

9. The electret film according to claim 7 or 8, characterized in that: At least two first grooves with different structures are disposed on at least one surface of the electret substrate.

10. The electret film according to any one of claims 1 to 9, characterized in that: The electret substrate comprises an electret film, the first pore structure is arranged on the electret film, and the first micro-nano particles are arranged on at least one surface of the electret film.

11. The electret film according to any one of claims 1 to 9, characterized in that: The electret substrate comprises an electret film, a second pore structure and second micro-nano particles, wherein the second pore structure is arranged in the electret film, the second pore structure is used to accommodate the second micro-nano particles, and the second micro-nano particles are arranged on at least one surface of the electret film.

12. The electret film according to claim 11, characterized in that: The second micro-nano particles of various sizes are arranged on at least one surface of the electret film.

13. The electret film according to claim 11 or 12, characterized in that: At least two second micro-nano particles with different structures are disposed on at least one surface of the electret film.

14. The electret film according to any one of claims 11 to 13, characterized in that: At least two second micro-nano particles made of different materials are disposed on at least one surface of the electret film.

15. The electret film according to any one of claims 11 to 14, characterized in that: At least one of the second micro-nano particles includes a second non-metal particle and a second metal layer, and a portion of the second non-metal particle is disposed inside the second metal layer.

16. The electret film according to any one of claims 11 to 15, characterized in that: At least one of the second micro-nano particles includes a second body portion and a plurality of second protrusions, and the plurality of second protrusions are arranged on the surface of the second body portion.

17. The electret film according to any one of claims 11 to 16, characterized in that: The second hole structure includes a plurality of second grooves. At least one surface of the electret film is provided with the second grooves. At least one of the second grooves is used to accommodate the second micro-nano particles.

18. The electret film according to claim 17, characterized in that: The second pore structure further includes at least one second through hole, the at least one second through hole penetrates the electret film, and the at least one second through hole is used to accommodate the second micro-nano particles.

19. A power generation device, characterized in that: The method comprises the electret film according to any one of claims 1 to 18.

20. An electronic device, characterized in that: Comprising the power generating device as claimed in claim 19.

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