Instantaneous discharge type piezoelectric nano generator and preparation method thereof

Abstract

The invention discloses an instantaneous discharge type piezoelectric nano generator and a preparation method thereof. The nano generator comprises a flexible substrate, a first piezoelectric film, a second piezoelectric film, a first flexible bending structure and a second flexible bending structure, the first piezoelectric film and the second piezoelectric film have the same polarization direction; first electrodes are arranged on two surfaces of the first piezoelectric film and the second piezoelectric film; the first electrodes of the surfaces, far away from the flexible substrate, of the first and second piezoelectric films are connected; the first electrodes, close to one surface of the flexible substrate, of the first piezoelectric film and the second piezoelectric film are connected; a second electrode is arranged on the first flexible bending structure; a third electrode is arranged on the second flexible bending structure; the second electrode is connected with the third electrode; and the first flexible bending structure and the second flexible bending structure are bent along with the stress of the deformable piezoelectric substrate to drive the second electrode and the third electrode to alternately contact with the first electrode at the opposite position so as to realize instantaneous discharge. According to the invention, the peak output and the charging rate of the PENG are improved.

Description

Technical Field

[0001] The invention belongs to the field of electronic technology, and in particular relates to an instantaneous discharge piezoelectric nanogenerator and a preparation method thereof. Background Art

[0002] In order to meet the growing demand for sustainable micro power sources for wearable and implantable micro medical electronic devices, researchers have actively developed energy harvesting technologies that can effectively convert bio-motion energy into electrical energy in recent years. As one of the promising energy harvesting technologies, piezoelectric nanogenerator (PENG) can effectively convert tiny and irregular mechanical energy (such as vibration, walking, wind, heartbeat and breathing movement) into usable electrical energy, which has attracted great attention. Based on this technology, researchers have developed a series of wearable and implantable nano-power generation devices. These devices can use biomechanical energy such as walking, heart movement, breathing movement and gastrointestinal peristalsis to power themselves, verifying the feasibility of cardiac pacing and correction of sinus arrhythmia, accelerated wound healing, and neural stimulation repair without the need for external power supply.

[0003] However, the practical application of wearable and implantable PENGs still faces the problem of low output performance and cannot achieve long-term effectiveness in vivo. In general, the piezoelectric output of PENGs is directly related to the degree of deformation, strain rate, and intrinsic polarization. Due to the relatively slow and low-frequency motions commonly seen in biological systems, the output mode of PENGs usually presents low-voltage wide-cell pulses with a peak voltage intensity of less than 1V, which results in low charging and power utilization efficiency. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides an instantaneous discharge piezoelectric nanogenerator.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] A transient discharge piezoelectric nanogenerator, comprising: a deformable piezoelectric substrate; the deformable piezoelectric substrate comprises: a flexible substrate, a first piezoelectric film located on a first surface of the flexible substrate, and a second piezoelectric film located on a second surface of the flexible substrate;

[0007] The first piezoelectric film and the second piezoelectric film have the same polarization direction; the first piezoelectric film and the second piezoelectric film are provided with first electrodes on both sides; the first piezoelectric film and the second piezoelectric film are connected to the first electrodes on the side away from the flexible substrate; the first piezoelectric film and the second piezoelectric film are connected to the first electrodes on the side close to the flexible substrate;

[0008] The instantaneous discharge piezoelectric nanogenerator further includes: a first flexible bending structure located on a first side of the deformable piezoelectric substrate and a second flexible bending structure located on a second side of the deformable piezoelectric substrate; a second electrode is disposed on the first flexible bending structure; the second electrode is opposite to the first electrode of the first piezoelectric film on a side away from the flexible substrate; a third electrode is disposed on the second flexible bending structure; the third electrode is opposite to the first electrode of the second piezoelectric film on a side away from the flexible substrate; the second electrode and the third electrode are connected;

[0009] The first flexible bending structure and the second flexible bending structure bend as the deformable piezoelectric substrate is subjected to force, driving the second electrode and the third electrode to alternately contact the first electrode at an opposite position to achieve instantaneous discharge.

[0010] Optionally, when the deformable piezoelectric substrate is not deformed, a gap is left between the second electrode and the first electrode opposite to it, and the third electrode is in contact with the first electrode opposite to it; when the deformable piezoelectric substrate is deformed to a certain extent due to force, the second electrode is in contact with the first electrode opposite to it, and the third electrode is separated from the first electrode opposite to it.

[0011] Optionally, the first flexible curved structure is a first flexible arch structure; and the second flexible curved structure is a second flexible arch structure.

[0012] Optionally, the first flexible curved structure is a first flexible π-shaped structure; and the second flexible curved structure is a second flexible π-shaped structure.

[0013] Optionally, the second electrode is located at the center of the first flexible curved structure, and the third electrode is located at the center of the second flexible curved structure.

[0014] Optionally, the first electrodes of the first piezoelectric film and the second piezoelectric film close to the flexible substrate are connected through a wire; the first electrodes of the first piezoelectric film and the second piezoelectric film away from the flexible substrate are connected through a wire; the second electrode and the third electrode are connected through a wire.

[0015] Optionally, the first flexible curved structure and the second flexible curved structure are both made of Kapton film.

[0016] Optionally, the first piezoelectric film and the second piezoelectric film are both polyvinylidene fluoride (PVDF) films.

[0017] Optionally, the flexible substrate is a polyethylene terephthalate (PET) substrate.

[0018] The present invention also provides a method for preparing an instantaneous discharge piezoelectric nanogenerator, comprising:

[0019] Step 1, providing a flexible substrate, fixing a first first electrode on a first surface of the flexible substrate, and leading out the first electrode with a wire;

[0020] Step 2: coating a piezoelectric material on the first surface of the flexible substrate to form a first piezoelectric film;

[0021] Step 3, fixing a second first electrode on the first piezoelectric film, and leading out the first electrode with a wire;

[0022] Step 4: fix a third first electrode on the second surface of the flexible substrate, and lead out the first electrode with a wire;

[0023] Step 5: coating a piezoelectric material on the second surface of the flexible substrate to form a second piezoelectric film;

[0024] Step 6: Fix a fourth first electrode on the second piezoelectric film and lead out the first electrode with a wire;

[0025] Step 7, connecting the first first electrode and the third first electrode together, and connecting the second first electrode and the fourth first electrode together;

[0026] Step 8: Install a first flexible bending structure on the first side of the first piezoelectric film so that the second electrode on the first flexible bending structure is opposite to the second first electrode and separated by a gap; install a second flexible bending structure on the second side of the second piezoelectric film so that the third electrode on the second flexible bending structure is opposite to and in contact with the fourth first electrode;

[0027] Step nine: connect the second electrode and the third electrode with a wire.

[0028] The instantaneous discharge piezoelectric nanogenerator provided by the present invention is configured with a first flexible bending structure and a second flexible bending structure on both sides of a deformable piezoelectric substrate, respectively, so that the first flexible bending structure and the second flexible bending structure bend with the force applied to the deformable piezoelectric substrate, thereby driving the second electrode and the third electrode on the two flexible bending structures to contact the first electrode at an opposite position alternately to achieve instantaneous discharge, thereby effectively accumulating the piezoelectric induced charge generated by the low-frequency or even ultra-low-frequency biological movement driving the PENG, and then converting the low-voltage wide-cell pulse into a high-voltage instantaneous pulse through instantaneous release, thereby greatly improving the peak output and charging rate of the PENG, and solving the problems existing in the prior art.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of an instantaneous discharge piezoelectric nanogenerator provided by an embodiment of the present invention;

[0031] Figure 2 The working principle of the instantaneous discharge piezoelectric nanogenerator provided by the embodiment of the present invention and the output electrical signals corresponding to its different working stages;

[0032] Figure 3 It is a structural comparison between the instantaneous discharge piezoelectric nanogenerator provided by the embodiment of the present invention and the conventional PENG;

[0033] Figure 4 The figure is a comparison of the discharge performance of the instantaneous discharge piezoelectric nanogenerator provided by the embodiment of the present invention and the conventional PENG;

[0034] Figure 5 A test circuit used for electrical testing of the instantaneous discharge piezoelectric nanogenerator provided by an embodiment of the present invention is shown;

[0035] Figure 6 is used Figure 5 The test circuit shown is used to perform electrical testing on the instantaneous discharge piezoelectric nanogenerator provided by the embodiment of the present invention to obtain a charging curve;

[0036] Figure 7 It is a flow chart of a method for preparing an instantaneous discharge piezoelectric nanogenerator provided in an embodiment of the present invention.

[0037] Reference numerals:

[0038] 1. Flexible substrate; 2. First piezoelectric film; 3. Second piezoelectric film; 4. First electrode; 5. First flexible bending structure; 6. Second flexible bending structure; 7. Second electrode; 8. Third electrode. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0040] In order to effectively improve the peak output and charging rate of PENG, an instantaneous discharge piezoelectric nanogenerator (IPNG) is provided in the embodiment of the present invention. Figure 1The instantaneous discharge piezoelectric nanogenerator includes: a deformable piezoelectric substrate, and the deformable piezoelectric substrate includes: a flexible substrate 1, a first piezoelectric film 2 located on a first surface of the flexible substrate 1, and a second piezoelectric film 3 located on a second surface of the flexible substrate 1.

[0041] The flexible substrate 1 is used to provide the necessary strength to support the cyclic deformation operation. The first piezoelectric film 2 and the second piezoelectric film 3 have the same polarization direction; the first piezoelectric film 2 and the second piezoelectric film 3 are provided with first electrodes 4 on both sides; the first piezoelectric film 2 and the first electrodes 4 of the second piezoelectric film 3 away from the flexible substrate 1 are connected (for example, connected by a wire), and the two first electrodes 4 constitute the surface electrode (SE) of the IPNG; the first piezoelectric film 2 and the first electrode 4 of the second piezoelectric film 3 close to the flexible substrate 1 are connected (for example, connected by a wire), and the two first electrodes 4 constitute the inner electrode (IE) of the IPNG.

[0042] Continue to see Figure 1 The instantaneous discharge piezoelectric nanogenerator provided by the embodiment of the present invention further includes: a first flexible bending structure 5 located on the first side of the deformable piezoelectric substrate and a second flexible bending structure 6 located on the second side of the deformable piezoelectric substrate; a second electrode 7 is provided on the first flexible bending structure 5; the second electrode 7 is opposite to the first electrode 4 on the side of the first piezoelectric film 2 away from the flexible substrate 1; a third electrode 8 is provided on the second flexible bending structure 6; the third electrode 8 is opposite to the first electrode 4 on the side of the second piezoelectric film 3 away from the flexible substrate 1; the second electrode 7 and the third electrode 8 are both contact electrodes (CE) of IPNG, and the second electrode 7 and the third electrode 8 are connected (for example, connected by a wire). An external load is connected between IE and CE to achieve instantaneous charge release.

[0043] The first flexible bending structure 5 and the second flexible bending structure 6 bend as the deformable piezoelectric substrate is subjected to force, driving the second electrode 7 and the third electrode 8 to alternately contact the first electrode 4 at an opposite position to achieve instantaneous discharge.

[0044] Specifically, when the deformable piezoelectric substrate is not deformed, a gap is left between the second electrode 7 and the first electrode 4 opposite to it to prevent short circuit, and the third electrode 8 is in contact with the first electrode 4 opposite to it; when the deformable piezoelectric substrate is deformed to a certain extent due to force, the second electrode 7 is in contact with the first electrode 4 opposite to it, and the third electrode 8 is separated from the first electrode 4 opposite to it.

[0045] Alternatively, when the deformable piezoelectric substrate is not deformed, a gap is left between the third electrode 8 and the first electrode 4 opposite to it to prevent short circuit, and the second electrode 7 is in contact with the first electrode 4 opposite to it; when the deformable piezoelectric substrate is deformed to a certain extent due to force, the third electrode 8 is in contact with the first electrode 4 opposite to it, and the second electrode 7 is separated from the first electrode 4 opposite to it.

[0046] See also Figure 2 , wherein part a schematically shows the instantaneous charge release mechanism of the IPNG provided by the embodiment of the present invention in one working cycle, and parts b and c show the corresponding current and charge output curves. Figure 2 In the initial state, the deformable piezoelectric substrate does not deform, and no charge flows in the external circuit. When the IPNG begins to bend (stage I), the lower CE separates from the lower SE, and the first piezoelectric film 2 and the second piezoelectric film 3 in the deformable piezoelectric substrate deform due to tension. The piezoelectric charge generated in the process continues to accumulate on the two SEs, and no charge is released to the external circuit at this time. When the deformation is large enough to make the upper CE contact the upper SE (stage II), the piezoelectric charge is instantaneously released from the SE to the IE through the upper CE and the external load R, achieving a high-intensity discharge peak. As the charge balances between the two SEs, the electrical signal returns to zero. When the IPNG deformation gradually recovers, the upper SE separates from the upper CE (stage III), and the recovery of the bending reduces the internal piezoelectric polarization, so the accumulated surface charge becomes unbalanced again, but it cannot be restored due to the separation of CE and SE. Until the IPNG returns to its original state, the lower CE contacts the lower SE (stage IV), resulting in the rapid release of excess surface charge through the external load R, thus generating an electrical pulse in the opposite direction (from IE to SE).

[0047] The instantaneous discharge piezoelectric nanogenerator provided in the embodiment of the present invention is configured by respectively arranging a first flexible bending structure 5 and a second flexible bending structure 6 on both sides of a deformable piezoelectric substrate, so that the first flexible bending structure 5 and the second flexible bending structure 6 are bent as the deformable piezoelectric substrate is subjected to force, thereby driving the second electrode 7 and the third electrode 8 on the two flexible bending structures to alternately contact the first electrode 4 in a relatively opposite position to achieve instantaneous discharge, thereby effectively accumulating the piezoelectric induced charge generated by the low-frequency or even ultra-low-frequency biological movement driving the PENG, and then converting the low-voltage wide-cell pulse into a high-voltage instantaneous pulse through instantaneous release, thereby greatly improving the peak output and charging rate of the PENG, and solving the problems existing in the prior art.

[0048] In the embodiment of the present invention, the specific structural composition of the first flexible curved structure 5 and the second flexible curved structure 6 may take various forms.

[0049] Exemplarily, in one implementation, the first flexible curved structure 5 may be a first flexible arched structure; and the second flexible curved structure 6 may be a second flexible arched structure.

[0050] Specifically, the first flexible arch structure and the second flexible arch structure have different arch heights, wherein the CE on the flexible arch structure with a higher arch height leaves a gap with the first electrode 4 at the opposite position when the deformable piezoelectric substrate is not deformed, and the CE on the flexible arch structure with a lower arch height just contacts the first electrode 4 at the opposite position when the deformable piezoelectric substrate is not deformed. In this way, the first flexible arch structure and the second flexible arch structure can bend with the force applied to the deformable piezoelectric substrate, thereby driving the second electrode 7 and the third electrode 8 to contact the first electrode 4 at the opposite position alternately to achieve instantaneous discharge.

[0051] In another implementation, the first flexible curved structure 5 may be a first flexible π-shaped structure; and the second flexible curved structure 6 may be a second flexible π-shaped structure.

[0052] Specifically, the first flexible π-shaped structure and the second flexible π-shaped structure have different heights, wherein the CE on the higher flexible π-shaped structure has a gap with the first electrode 4 at the opposite position when the deformable piezoelectric substrate is not deformed, and the CE on the lower flexible π-shaped structure just contacts the first electrode 4 at the opposite position when the deformable piezoelectric substrate is not deformed. In this way, the first flexible π-shaped structure and the second flexible π-shaped structure can bend with the force applied to the deformable piezoelectric substrate, thereby driving the second electrode 7 and the third electrode 8 to contact the first electrode 4 at the opposite position alternately to achieve instantaneous discharge.

[0053] It should be noted that the specific structural composition of the first flexible bending structure 5 and the second flexible bending structure 6 is not limited to the arch structure or π-shaped structure shown above. Any structure that can bend with the force applied to the deformable piezoelectric substrate, thereby driving the second electrode 7 and the third electrode 8 to alternately contact the first electrode 4 in the opposite position to achieve instantaneous discharge, can be used as the first flexible bending structure 5 and the second flexible bending structure 6 in the embodiment of the present invention.

[0054] In the embodiment of the present invention, the first flexible curved structure 5 and the second flexible curved structure 6 can be made of Kapton film, but it is not limited thereto. For example, flexible materials such as PTFE (polytetrafluoroethylene) and PVC (polyvinyl chloride) can also be used to prepare the first flexible curved structure 5 and the second flexible curved structure 6. Kapton film is a polyimide film developed by DuPont.

[0055] In addition, in order to achieve a better bending effect, the thickness of the flexible material used to prepare the first flexible bending structure 5 and the second flexible bending structure 6 is preferably 30 micrometers to 1 millimeter.

[0056] In the embodiment of the present invention, the first piezoelectric film 2 and the second piezoelectric film 3 can both be polyvinylidene fluoride PVDF films, but are of course not limited to this. For example, materials with piezoelectric effect such as PVDF-TrFE (polyvinylidene fluoride-trifluoroethylene), PZT (lead zirconate titanate) or BTO (barium titanium oxide) can also be used to prepare the first piezoelectric film 2 and the second piezoelectric film 3.

[0057] It is understandable that the greater the thickness of the film of the same material, the less likely it is to bend, so in practice an appropriate thickness can be selected according to the actual environment. Preferably, the thickness of the material used to prepare the first piezoelectric film 2 and the second piezoelectric film 3 can be 1 nanometer to 1 millimeter.

[0058] In the embodiment of the present invention, the flexible substrate 1 may be a polyethylene terephthalate (PET) substrate, but is not limited thereto. For example, materials such as PTFE (polytetrafluoroethylene) and PVC (polyvinyl chloride) may also be used to prepare the flexible substrate 1.

[0059] It is understandable that the thicker the flexible substrate 1 is, the greater the force required to bend the device and the greater the output. The substrate is selected according to the driving force of the application environment, so in practice the thickness of the flexible substrate 1 can be selected according to the driving force of the application environment. Preferably, the thickness of the material used to prepare the flexible substrate 1 can be 50 microns to 1 mm, for example, 100 microns.

[0060] In the embodiment of the present invention, the first electrode can be prepared by various conductive film manufacturing technologies, and the material can be various conductive metals, such as gold, silver, copper, platinum, etc., or conductive polymers are also feasible. The thickness of the conductive film can be 10 nanometers to 100 microns, as long as the conductivity is guaranteed. Here, the first electrode exists in the form of a thin film, which helps the first piezoelectric film 2 and the second piezoelectric film 3 to better fit the flexible substrate 1.

[0061] In addition, the specific structural forms of the second electrode 7 and the third electrode 8 are not limited in the embodiment of the present invention. For example, a convex electrode structure such as a semi-cylindrical structure or a square structure may be used to form a more sensitive contact with the first electrode 4.

[0062] For example, a rigid or elastic solid phase material may be used for additive or subtractive manufacturing to obtain a semi-cylindrical structure, and then a layer of copper foil is coated on the surface thereof as the second electrode 7 and the third electrode 8 .

[0063] Figure 3The figure schematically shows a structural comparison between an instantaneous discharge piezoelectric nanogenerator provided by an embodiment of the present invention and an existing common PENG, wherein the flexible substrate 1 is made of PET, the first flexible curved structure 5 and the second flexible curved structure 6 are made of Kapton, the first piezoelectric film 2 and the second piezoelectric film 3 are made of PVDF; the fourth electrode 4 is represented as Electrode, the second electrode 7 and the third electrode 8 are represented as Switch electrode, and Electrical dipole represents an electric dipole. Figure 3 The device structure shown in the figure is used to conduct electrical tests on the nanogenerators of the two structures by connecting CE and IE. The discharge performance comparison is shown in the figure. Figure 4 As shown in the figure, the peak output and charging rate of the IPNG provided by the embodiment of the present invention are higher than those of the conventional PENG. Figure 5 The test circuit shown in the embodiment of the present invention provides Figure 3 The charging curve obtained by electrical testing of the instantaneous discharge piezoelectric nanogenerator is as follows: Figure 6 .

[0064] Based on the same inventive concept, the present invention also provides a method for preparing an instantaneous discharge piezoelectric nanogenerator, see Figure 7 As shown, the preparation method comprises the following steps:

[0065] Step 1: provide a flexible substrate, fix a first first electrode on a first surface of the flexible substrate, and lead out the first electrode with a wire.

[0066] Specifically, the first electrode 4 may be fixed on the first surface of the flexible substrate 1 by using curable glue.

[0067] Step 2: coating a piezoelectric material on the first surface of the flexible substrate to form a first piezoelectric film.

[0068] Here, when the piezoelectric material is coated on the first surface of the flexible substrate 1 to form the first piezoelectric film 2, it is necessary to ensure that the first piezoelectric film 2 is accurately attached to the flexible substrate 1, and the first piezoelectric film 2 is subjected to a sufficient drying and curing process. In addition, any form of curable glue can be used to fix the first piezoelectric film 2 to the flexible substrate 1.

[0069] Step 3: Fix a second first electrode on the first piezoelectric film and lead out the first electrode with a wire.

[0070] Here, curable glue may be used to fix the second first electrode 4 on the first piezoelectric film 2 .

[0071] Step 4: fix the third first electrode on the second surface of the flexible substrate, and lead out the first electrode with a wire.

[0072] Specifically, the third first electrode 4 may be fixed on the second surface of the flexible substrate 1 by using curable glue.

[0073] Step 5: coating the piezoelectric material on the second surface of the flexible substrate to form a second piezoelectric film.

[0074] Here, when the piezoelectric material is coated on the second surface of the flexible substrate 1 to form the second piezoelectric film 3, it is necessary to ensure that the second piezoelectric film 3 is accurately attached to the flexible substrate 1, and the second piezoelectric film 3 is subjected to a sufficient drying and curing process. In addition, any form of curable glue can be used to fix the second piezoelectric film 3 to the flexible substrate 1.

[0075] At this point, the first piezoelectric film 2, the flexible substrate 1 and the second piezoelectric film 3 constitute a deformable piezoelectric substrate.

[0076] Step six: fix the fourth first electrode on the second piezoelectric film and lead out the first electrode with a wire.

[0077] Here, curable glue may be used to fix the fourth first electrode 4 on the second piezoelectric film 3 .

[0078] Step 7: Connect the first first electrode and the third first electrode together, and connect the second first electrode and the fourth first electrode together.

[0079] Specifically, the first first electrode 4 and the third first electrode 4 are both first electrodes 4 attached to the flexible substrate 1, and are connected together by a wire as the IE of IPNG. The second first electrode 4 and the fourth first electrode 4 are both first electrodes 4 exposed to air, and are connected together by a wire as the SE of IPNG.

[0080] Step 8: Install a first flexible bending structure on the first side of the first piezoelectric film so that the second electrode on the first flexible bending structure is opposite to the second first electrode and separated by a gap; install a second flexible bending structure on the second side of the second piezoelectric film so that the third electrode on the second flexible bending structure is opposite to and in contact with the fourth first electrode.

[0081] Specifically, a first flexible curved structure 5 and a second flexible curved structure 6 are prepared using a flexible material, and a second electrode 7 and a third electrode 8 are prepared; the prepared second electrode 7 and the third electrode 8 are respectively installed on the first flexible curved structure 5 and the second flexible curved structure 6; then, the first flexible curved structure 5 and the second flexible curved structure 6 are respectively fixed to the first side and the second side of the deformable piezoelectric substrate using AB glue.

[0082] Exemplarily, a semi-cylindrical structure with a radius of 0.3 cm and a height of about 1 cm can be prepared using 3D printing technology, and then its cross section is fixed at the center of the flexible curved structure, and then copper foil is wrapped on the surface of the semi-cylindrical structure as the second electrode 7 and the third electrode 8. In the assembly stage, a certain distance is left between the second electrode 7 and the first surface of the deformable piezoelectric substrate (the surface where the first piezoelectric film 2 is located), and the two are not in contact, and the third electrode 8 is in direct contact with the second surface of the deformable piezoelectric substrate (the surface where the second piezoelectric film 3 is located).

[0083] Step 9: Connect the second electrode and the third electrode with a wire.

[0084] Here, the second electrode 7 and the third electrode 8 are connected by a wire to serve as the CE of the IPNG.

[0085] In the above preparation method, the specific materials and size settings of the flexible substrate 1, the first flexible bending structure 5, the second flexible bending structure 6, the first piezoelectric film 2, the second piezoelectric film 3 and each electrode have been illustrated in the product embodiment, and can be seen above, so they will not be repeated here.

[0086] The instantaneous discharge piezoelectric nanogenerator prepared by the preparation method provided by the embodiment of the present invention can effectively accumulate the piezoelectric induced charge generated by the low-frequency or even ultra-low-frequency biological body movement driving PENG, and then convert the low-voltage wide cell pulse into a high-voltage instantaneous pulse through instantaneous release, thereby greatly improving the peak output and charging rate of PENG, solving the problems existing in the prior art. In addition, the preparation method provided by the embodiment of the present invention is simple and low-cost, and can realize the mass production of IPNG.

[0087] It should be noted that the terms "first", "second", etc. 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 present invention described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0089] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art can understand and implement other changes to the disclosed embodiments by viewing the drawings and the disclosed content. In the description of the present invention, the term "comprising" does not exclude other components or steps, "one" or "an" does not exclude multiple situations, and "multiple" means two or more, unless otherwise clearly and specifically limited. In addition, certain measures are recorded in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0090] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0091] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or 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 present invention can be understood according to specific circumstances.

[0092] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0093] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An instantaneous discharge piezoelectric nanogenerator, characterized in that: include: A deformable piezoelectric substrate; The deformable piezoelectric substrate comprises: a flexible substrate, a first piezoelectric film located on a first surface of the flexible substrate, and a second piezoelectric film located on a second surface of the flexible substrate; The first piezoelectric film and the second piezoelectric film have the same polarization direction; the first piezoelectric film and the second piezoelectric film are provided with first electrodes on both sides; the first piezoelectric film and the second piezoelectric film are connected to the first electrodes on the side away from the flexible substrate; the first piezoelectric film and the second piezoelectric film are connected to the first electrodes on the side close to the flexible substrate; The instantaneous discharge piezoelectric nanogenerator further includes: a first flexible bending structure located on a first side of the deformable piezoelectric substrate and a second flexible bending structure located on a second side of the deformable piezoelectric substrate; a second electrode is disposed on the first flexible bending structure; the second electrode is opposite to the first electrode of the first piezoelectric film on a side away from the flexible substrate; a third electrode is disposed on the second flexible bending structure; the third electrode is opposite to the first electrode of the second piezoelectric film on a side away from the flexible substrate; the second electrode and the third electrode are connected; The first flexible bending structure and the second flexible bending structure bend as the deformable piezoelectric substrate is subjected to force, driving the second electrode and the third electrode to alternately contact the first electrode at an opposite position to achieve instantaneous discharge.

2. The instantaneous discharge piezoelectric nanogenerator according to claim 1, characterized in that: When the deformable piezoelectric substrate is not deformed, a gap is left between the second electrode and the first electrode opposite to it, and the third electrode is in contact with the first electrode opposite to it; When the deformable piezoelectric substrate is deformed to a certain extent due to force, the second electrode contacts the first electrode opposite to the second electrode, and the third electrode is separated from the first electrode opposite to the second electrode.

3. The instantaneous discharge piezoelectric nanogenerator according to claim 2, characterized in that: The first flexible curved structure is a first flexible arch structure; the second flexible curved structure is a second flexible arch structure.

4. The instantaneous discharge piezoelectric nanogenerator according to claim 2, characterized in that: The first flexible curved structure is a first flexible π-shaped structure; the second flexible curved structure is a second flexible π-shaped structure.

5. The instantaneous discharge piezoelectric nanogenerator according to claim 3 or 4, characterized in that: The second electrode is located at the center of the first flexible curved structure, and the third electrode is located at the center of the second flexible curved structure.

6. The instantaneous discharge piezoelectric nanogenerator according to claim 1, characterized in that: The first electrodes of the first piezoelectric film and the second piezoelectric film close to the flexible substrate are connected through a wire; the first electrodes of the first piezoelectric film and the second piezoelectric film away from the flexible substrate are connected through a wire; the second electrode and the third electrode are connected through a wire.

7. The instantaneous discharge piezoelectric nanogenerator according to claim 1, characterized in that: The first flexible curved structure and the second flexible curved structure are both made of Kapton film.

8. The instantaneous discharge piezoelectric nanogenerator according to claim 1, characterized in that: The first piezoelectric film and the second piezoelectric film are both polyvinylidene fluoride (PVDF) films.

9. The instantaneous discharge piezoelectric nanogenerator according to claim 1, characterized in that: The flexible substrate is a polyethylene terephthalate (PET) substrate.

10. A method for preparing an instantaneous discharge piezoelectric nanogenerator, characterized in that: include: Step 1, providing a flexible substrate, fixing a first first electrode on a first surface of the flexible substrate, and leading out the first electrode with a wire; Step 2: coating a piezoelectric material on the first surface of the flexible substrate to form a first piezoelectric film; Step 3, fixing a second first electrode on the first piezoelectric film, and leading out the first electrode with a wire; Step 4: fix a third first electrode on the second surface of the flexible substrate, and lead out the first electrode with a wire; Step 5: coating a piezoelectric material on the second surface of the flexible substrate to form a second piezoelectric film; Step 6: Fix a fourth first electrode on the second piezoelectric film and lead out the first electrode with a wire; Step 7, connecting the first first electrode and the third first electrode together, and connecting the second first electrode and the fourth first electrode together; Step 8: Install a first flexible bending structure on the first side of the first piezoelectric film so that the second electrode on the first flexible bending structure is opposite to the second first electrode and separated by a gap; install a second flexible bending structure on the second side of the second piezoelectric film so that the third electrode on the second flexible bending structure is opposite to and in contact with the fourth first electrode; Step nine: connect the second electrode and the third electrode with a wire.

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