阅读说明：本技术 柔性混合发电机及制备方法与应用、柔性自充电装置 (Flexible hybrid generator, preparation method and application thereof, and flexible self-charging device ) 是由 龚子丹 马正宜 张倩倩 陈志超 陈锦潮 张汉正 于 2020-05-28 设计创作，主要内容包括：本发明公开了柔性混合发电机及制备方法与应用、柔性自充电装置。其中,所述柔性混合发电机,包括：上电极层、下电极层、以及一端与所述上电极层连接且另一端与所述下电极层连接的多根发电纤维；其中,所述发电纤维包括压电发电纤维和摩擦发电纤维；所述压电发电纤维为聚偏氟乙烯纳米纤维/银纳米线复合纤维；所述摩擦发电纤维为聚二甲基硅氧烷/纳米石墨复合纤维。本发明所述聚偏氟乙烯纳米纤维/银纳米线用于制作压电发电机,所述聚二甲基硅氧烷/纳米石墨用于制作摩擦发电机,从而获得了摩擦压电混合发电机,可以大大的提高输出功率。(The invention discloses a flexible hybrid generator, a preparation method and application thereof, and a flexible self-charging device. Wherein the flexible hybrid generator comprises: the power generation device comprises an upper electrode layer, a lower electrode layer and a plurality of power generation fibers, wherein one end of each power generation fiber is connected with the upper electrode layer, and the other end of each power generation fiber is connected with the lower electrode layer; wherein the power generation fibers comprise piezoelectric power generation fibers and friction power generation fibers; the piezoelectric power generation fiber is polyvinylidene fluoride nanofiber/silver nanowire composite fiber; the friction power generation fiber is polydimethylsiloxane/nano graphite composite fiber. The polyvinylidene fluoride nano fiber/silver nanowire is used for manufacturing a piezoelectric generator, and the polydimethylsiloxane/nano graphite is used for manufacturing a friction generator, so that a friction piezoelectric hybrid generator is obtained, and the output power can be greatly improved.)

1. A flexible hybrid generator, comprising:

the power generation device comprises an upper electrode layer, a lower electrode layer and a plurality of power generation fibers, wherein one end of each power generation fiber is connected with the upper electrode layer, and the other end of each power generation fiber is connected with the lower electrode layer;

wherein the power generation fibers comprise piezoelectric power generation fibers and friction power generation fibers;

the piezoelectric power generation fiber is polyvinylidene fluoride nanofiber/silver nanowire composite fiber;

the friction power generation fiber is polydimethylsiloxane/nano graphite composite fiber.

2. The flexible hybrid generator of claim 1, wherein the power generating fibers are helical power generating fibers.

3. A method of making the flexible hybrid generator of claim 1, comprising: preparing polyvinylidene fluoride nano fiber/silver nanowire composite fiber;

preparing polydimethylsiloxane/nano graphite composite fibers;

and respectively fixing two ends of the polyvinylidene fluoride nano fiber/silver nanowire composite fiber and the polydimethylsiloxane/nano graphite composite fiber in an upper electrode layer and a lower electrode layer to prepare the flexible hybrid generator.

4. The method for preparing a flexible hybrid generator according to claim 3, wherein the preparing polyvinylidene fluoride nanofiber/silver nanowire composite fiber specifically comprises:

preparing a mixed solution containing polyvinylidene fluoride iron and silver nanowires;

and (3) carrying out electrostatic spinning on the mixed solution to prepare the polyvinylidene fluoride nano fiber/silver nanowire composite fiber.

5. The method for manufacturing the flexible hybrid generator according to claim 4, wherein the mixed solution containing the polyvinylidene fluoride iron and the silver nanowires is 18 wt% of the polyvinylidene fluoride iron.

6. The method for manufacturing the flexible hybrid generator according to claim 4, wherein the mixed solution containing polyvinylidene fluoride iron and silver nanowires is 2.0 wt% of the silver nanowires.

7. The method of claim 6, wherein the polydimethylsiloxane/nanographite composite fiber is Bi-containing_0.5Na_0.5TiO₃Particulate polydimethylsiloxane/nanographite composite fibers.

8. The method of manufacturing a flexible hybrid generator according to claim 3, wherein the mass percentage of the nano-graphite particles in the polydimethylsiloxane/nano-graphite composite fiber is 3.0 wt%.

9. A flexible self-charging device, comprising: the flexible hybrid generator of claim 1.

10. Use of the flexible hybrid generator of claim 1 in the manufacture of a garment.

Technical Field

The invention relates to the technical field of power generation, in particular to a flexible hybrid generator, a preparation method and application thereof, and a flexible self-charging device.

Background

With the rapid development of wearable sensors in recent years, the rapid development of wearable electronic devices makes the wearable electronic devices an indispensable part of our lives, such as sports bracelets, smart phones, and some wearable medical sensing devices for monitoring human body movement and health conditions, which are working without energy supply. Under the trend of miniaturization and lightness, the problem of energy supply of electronic equipment, such as short endurance time and frequent need of charging or replacing batteries, causes inconvenience to people, and becomes an important factor for hindering further development. Moreover, a large amount of continuous small electricity consumption has a certain influence on the sustainable development of the environment.

However, the mechanical energy generated by the daily activities of the human body has the advantages of continuity, no limitation by the environment and weather, no pollution and the like. The mechanical energy of the human body activity is collected to generate electric energy to be supplied to the electronic equipment, so that the endurance time of the electronic equipment can be prolonged. However, the flexible generator in the prior art has the problem of low output power.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a flexible hybrid generator, a preparation method and application thereof, and a flexible self-charging device, and aims to solve the problem that the output power of the flexible generator in the prior art is low.

A flexible hybrid generator, comprising:

the power generation device comprises an upper electrode layer, a lower electrode layer and a plurality of power generation fibers, wherein one end of each power generation fiber is connected with the upper electrode layer, and the other end of each power generation fiber is connected with the lower electrode layer;

wherein the power generation fibers comprise piezoelectric power generation fibers and friction power generation fibers;

the piezoelectric power generation fiber is polyvinylidene fluoride nanofiber/silver nanowire composite fiber;

the friction power generation fiber is polydimethylsiloxane/nano graphite composite fiber.

The flexible hybrid generator, wherein the power generating fiber is a helical power generating fiber.

A method for preparing a flexible hybrid generator as described above, comprising:

preparing polyvinylidene fluoride nano fiber/silver nanowire composite fiber;

preparing polydimethylsiloxane/nano graphite composite fibers;

and respectively fixing two ends of the polyvinylidene fluoride nano fiber/silver nanowire composite fiber and the polydimethylsiloxane/nano graphite composite fiber in an upper electrode layer and a lower electrode layer to prepare the flexible hybrid generator.

The preparation method of the flexible hybrid generator comprises the following steps of:

preparing a mixed solution containing polyvinylidene fluoride iron and silver nanowires;

and (3) carrying out electrostatic spinning on the mixed solution to prepare the polyvinylidene fluoride nano fiber/silver nanowire composite fiber.

The preparation method of the flexible hybrid generator comprises the step of mixing polyvinylidene fluoride iron and silver nanowires in a mixed solution containing the polyvinylidene fluoride iron and the silver nanowires, wherein the mass percentage of the polyvinylidene fluoride iron is 18 wt%.

The preparation method of the flexible hybrid generator comprises the step of mixing polyvinylidene fluoride iron with silver nanowires, wherein the mixed liquid containing the polyvinylidene fluoride iron and the silver nanowires is 2.0 wt% in percentage by mass.

The preparation method of the flexible hybrid generator comprises the step of preparing the composite fiber containing the polydimethylsiloxane/the nano-graphite, wherein the composite fiber contains Bi_0.5Na_0.5TiO₃Particulate polydimethylsiloxane/nanographite composite fibers.

The preparation method of the flexible hybrid generator comprises the step of enabling the mass percent of the nano graphite particles in the polydimethylsiloxane/nano graphite composite fiber to be 3.0 wt%.

A flexible self-charging device, comprising: a flexible hybrid generator as described above.

Use of a flexible hybrid generator as described above in the manufacture of a garment.

Has the advantages that: in the flexible hybrid generator, the polyvinylidene fluoride nano fiber/silver nanowire composite fiber is used for manufacturing a piezoelectric generator, the polydimethylsiloxane/nano graphite composite fiber is used for manufacturing a friction generator, and the polydimethylsiloxane/nano graphite composite fiber and the friction generator are compounded to obtain the friction piezoelectric hybrid generator, wherein the polyvinylidene fluoride nano fiber/silver nanowire composite fiber and the polydimethylsiloxane/nano graphite composite fiber have high dielectric constants, can reduce dielectric loss and can greatly improve output power.

Drawings

Fig. 1 is a schematic structural view of a flexible hybrid generator according to the present invention.

Detailed Description

The invention provides a flexible hybrid generator, a preparation method and application thereof, and a flexible self-charging device, and further detailed description is provided below to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the present invention provides a flexible hybrid generator, comprising:

an upper electrode layer 1, a lower electrode layer 3, and a plurality of power generation fibers 2 having one end connected to the upper electrode layer 1 and the other end connected to the lower electrode layer 3;

wherein the power generation fiber 2 comprises a piezoelectric power generation fiber and a friction power generation fiber;

the piezoelectric power generation fiber is polyvinylidene fluoride nanofiber/silver nanowire composite fiber;

the friction power generation fiber is polydimethylsiloxane/nano graphite composite fiber.

In the flexible hybrid generator, each polyvinylidene fluoride nanofiber/silver nanowire composite fiber and each polyvinylidene fluoride nanofiber/silver nanowire composite fiber form a nano generator; a plurality of power generation fibers 2 are regularly or alternately arranged between the upper electrode layer 1 and the lower electrode layer 3, so that the friction power generation fibers can generate electricity by mutual friction with the fibers in contact with the friction power generation fibers, and the piezoelectric power generation fibers generate electricity in the extrusion process, namely the power generation fibers 2 form a mixed power generation layer; the electrode materials of the upper layer and the lower layer are connected through a nanogenerator, so that the upper electrode layer 1 and the lower electrode layer 3 form a capacitor, and the electric energy generated by the nanogenerator is stored in the capacitor (the upper electrode layer 1 and the lower electrode layer 3, wherein the upper electrode layer 1 and the lower electrode layer 3 are made of flexible electrode materials, and optionally, the electrode materials are conductive fiber cloth.

In the flexible hybrid generator, the polyvinylidene fluoride nano fiber/silver nanowire composite fiber is used for manufacturing a piezoelectric generator, the polydimethylsiloxane/nano graphite composite fiber is used for manufacturing a friction generator, and the polydimethylsiloxane/nano graphite composite fiber and the friction generator are compounded to obtain the friction piezoelectric hybrid generator, wherein the polyvinylidene fluoride nano fiber/silver nanowire composite fiber and the polydimethylsiloxane/nano graphite composite fiber have high dielectric constants, can reduce dielectric loss and can greatly improve output power.

Therefore, the flexible hybrid generator can overcome the defects of low output voltage of an independent piezoelectric nano generator and low output current of an independent friction nano generator, and can improve the output power density of the composite nano generator.

Further, the power generating fiber 2 is a power generating fiber 2 having a spiral shape. The helical power generating fiber 2 has a spring-like structure, and therefore, may be referred to as a spring-like power generating fiber 2. The flexible hybrid generator can be made to have good compression resilience performance by making the power generation fiber 2 into a spiral power generation fiber 2.

The helical power generation fibers 2 are interlaced with each other to form a porous three-dimensional structure, and can show good compression resilience under the condition of applying pressure, and the performance can reduce the most common problems in the current sensors: hysteresis effects and can therefore be used to make pressure sensors.

In addition, the flexible hybrid generator may further include a spacing fabric layer, for example, disposed between the upper electrode layer 1 and the lower electrode layer 3, and the spacing fabric layer may be made of high elastic fiber having a spiral structure, so as to further improve the resilience between the upper electrode layer 1 and the lower electrode layer 3. Therefore, the friction-piezoelectric mixed nano generator of the spacer fabric is prepared, so that the working efficiency of the device is improved. The spiral-structured power generation fiber 2 has high elasticity, and the excellent space structure of the spacer fabric has good compression resilience and other unique mechanical characteristics, can quickly rebound under the condition of pressure to generate electric energy, and can be converted into electric energy when being pressed to absorb mechanical energy or more effectively.

Further, the present invention provides a method for manufacturing a flexible hybrid generator, comprising:

preparing polyvinylidene fluoride nano fiber/silver nanowire composite fiber;

preparing polydimethylsiloxane/nano graphite composite fibers;

and respectively fixing the polyvinylidene fluoride nano fiber/silver nanowire composite fiber and the polydimethylsiloxane/nano graphite composite fiber in an upper electrode layer 1 and a lower electrode layer 3 to prepare the flexible hybrid generator.

According to the invention, the silver nanowire modified composite material is provided and prepared by comparing the performances of the polyvinylidene fluoride-ferric iron/silver nanowire and the polyvinylidene dimethyl siloxane/graphite nano composite material with the performances of the polyvinylidene fluoride/nano boron oxide nano fiber membrane and the polyvinylidene fluoride-ferric iron nano fiber so as to improve the power generation performance of the generator. Specifically, the peak open-circuit voltage and the peak current under 5.1M Ω of the vinylidene fluoride-ferric iron/silver nanowire and the polyvinylidene fluoride-dimethylsiloxane/graphite nanocomposite were 33.97V and 4 μ a, respectively, and the peak compressive force was 1500N. The maximum current of the polyvinylidene fluoride/nano boron oxide nanofiber membrane and the maximum current of the polyvinylidene fluoride-ferric iron nanofiber membrane are 0.78 muA, the maximum voltage is 27.1V, and the maximum output power is 0.078 mW. The silver nanowire modified composite material is used for improving the power generation performance of the generator, and the result proves that the silver nanowire modified composite material has good output performance and output stability.

In an implementation manner of the present invention, the preparing the polyvinylidene fluoride nanofibers/silver nanowires specifically includes:

preparing a mixed solution containing polyvinylidene fluoride iron and silver nanowires;

and (3) performing electrostatic spinning on the mixed solution containing the polyvinylidene fluoride iron and the silver nanowires to prepare the polyvinylidene fluoride nanofiber/silver nanowire composite fiber.

In the actual operation of electrostatic spinning, firstly, a precursor solution formed by mixing and stirring prepared zinc oxide, ethanol, DMF, acetic acid and PVP is filled into an injector, positive high voltage is applied to the tail end of a needle head, a receiving device is connected with negative high voltage or grounded, so that an electric field is formed between a needle point and the receiving device, under the action of the electric field, an electric field force in the direction opposite to the surface tension of the solution is generated by the charged solution, the electric field force is correspondingly increased along with the increase of the applied voltage, when the electric field force reaches a certain value, liquid drops at the needle point are pulled into a conical shape under the combined action of the electric field force and the surface tension, namely a Taylor cone is formed, when the electric field force is further increased, the liquid drops overcome the surface tension to form jet flow, the jet flow continuously 'whip' before the jet flow reaches the receiving device, the jet flow continuously splits and thins and breaks down, simultaneously, the solvent is continuously volatilized and solidified, finally, the solvent is deposited on the receiving device, and the relevant parameters of the electrostatic spinning speed is about 0.3 mu L, about 0.03-03-3 mu-m1., the spinning voltage is controlled within 18 kV-25 cm..

In order to better study the performance of the flexible hybrid generator, the invention prepares the piezoelectric composite material with silver nanowires in different proportions. Specifically, in the preparation process, silver nanowires with mass fractions of 1.0 wt%, 1.5 wt%, 2.0 wt%, 2.5 wt% and 3.0 wt% are respectively tested, and the test effect of the piezoelectric polymer nanofiber with the silver nanowires of 2.0 wt% is found to be the best.

In one implementation mode of the invention, in the mixed liquid of the polyvinylidene fluoride iron and the silver nanowires, the mass percentage of the polyvinylidene fluoride iron is 18 wt%; the mass percent of the silver nanowires is 2.0 wt%. Experiments show that when the proportion of the silver nanowires is 2.0 wt%, the prepared composite material has the best effect.

In an implementation manner of the present invention, the polyvinylidene fluoride nano fiber/silver nanowire composite fiber containing polyvinylidene fluoride iron and silver nanowires can be first prepared by electrostatic spinning, and then the polyvinylidene fluoride nano fiber/silver nanowire composite fiber is spun into a polyvinylidene fluoride nano fiber/silver nanowire film, and the prepared polyvinylidene fluoride nano fiber/silver nanowire film can also be used for preparing a piezoelectric power generation film. The polyvinylidene fluoride nano fiber/silver nanowire composite fiber is 200nm to 700nm in diameter, and the silver nanowire is 120nm in diameter.

Specifically, a polyvinylidene fluoride nanofiber (PVDF)/Silver nanowire (polyvinylidene fluoride and Silver nanowire) composite fiber is adopted to manufacture the piezoelectric generator. The composite fiber containing 2.0 wt% of silver nanowires in 18 wt% of polyvinylidene fluoride iron solution is prepared by an electrostatic spinning method. The diameter range of the polyvinylidene fluoride nano fiber/silver nanowire composite fiber is 200nm to 700nm, and the diameter of the silver nanowire is about 120 nm. The peak open circuit voltage and peak current at 5.1M Ω were 33.97V and 4 μ a, respectively. The peak compressive forces were 1500N, respectively.

The invention adopts Polydimethylsiloxane (PDMS)/Nano-graphite (polydimethysiloxane/Nano-graphite) composite fiber to prepare the friction generator. In one implementation of the present invention, the mass percentage of the nano-graphite particles in the Polydimethylsiloxane (PDMS)/nano-graphite composite fiber is 3.0 wt%. Experiments have found that the ratio of the nano-graphite particles in the polydimethylsiloxane/nano-graphite composite fiber is the optimal ratio when the ratio is 3.0 wt%, and when the ratio of the nano-graphite particles is more than 3.0 wt%, a local conductive network is formed to deteriorate the performance of the device.

In one embodiment of the present invention, the addition of Bi_0.5Na_0.5TiO₃Particles and nano graphite are dispersed in the polydimethylsiloxane, and the Bi-containing material is prepared by electrostatic spinning_0.5Na_0.5TiO₃Particulate Polydimethylsiloxane (PDMS)/nanographite composite fibers.

The piezoelectric generator and the friction generator play two roles in the invention: piezoelectric and triboelectric are generated. When a force is applied to the upper electrode, the hybrid generator may produce a peak open circuit voltage and a peak current, resulting in a lower resistive load.

In one implementation manner of the present invention, the preparing of the flexible hybrid generator by compounding the polyvinylidene fluoride nanofiber/silver nanowire composite fiber with the polydimethylsiloxane/nano graphite composite fiber specifically includes: taking polyvinylidene fluoride nano fiber/silver nanowire composite fiber as piezoelectric power generation fiber; the polydimethylsiloxane/nano graphite composite fiber is used as a friction power generation fiber. Two ends of the polyvinylidene fluoride nano fiber/silver nanowire composite fiber and the polydimethylsiloxane/nano graphite composite fiber are respectively fixed in the upper electrode layer 1 and the lower electrode layer 3 to prepare the flexible hybrid generator, and the fixing mode can be bonding fixing. The polyvinylidene fluoride nano fiber/silver nanowire composite fiber and the polydimethylsiloxane/nano graphite composite fiber are further woven into a textile membrane through a textile process, and then are connected with the upper electrode layer 1 and the lower electrode layer 3, and the electrode layers can be made of conductive fiber cloth, but the method is not limited to the above.

In one embodiment of the present invention, the material of the power generation fiber 2 may be a composite wire in which the polyvinylidene fluoride nanofiber/silver nanowire, the polydimethylsiloxane/nanographite, and an electrode layer material are coated at intervals. Specifically, the composite filament is a fiber with a multilayer structure, wherein materials of adjacent layers are different, the materials of the layers are selected from one of polyvinylidene fluoride nano fiber/silver nano wire, polydimethylsiloxane/nano graphite and electrode layer materials, and relative movement can be carried out between the layers to a certain extent. That is, since the layers in the composite filament can move relatively, for example, during the stretching and recovery process, displacement and friction are generated between the different layers, so as to convert mechanical energy into electrical energy, i.e., the composite filament is a fiber with power generation capability.

The preparation method of the composite yarn can be a coating method. For example, polyvinylidene fluoride nano fiber/silver nano wire, polydimethylsiloxane/nano graphite and electrode layer material are sequentially coated on the core material fiber. The core material fiber may be a highly elastic fiber material or one of the above materials. The preparation method of the composite wire can also be characterized in that tubular fibers are respectively prepared from polyvinylidene fluoride-coated nanofiber/silver nanowire, polydimethylsiloxane/nano graphite and electrode layer materials, the inner diameters of the tubular fibers are different, and the tubular fibers with different inner diameters are nested to form the composite wire with a multilayer structure.

Optionally, in the flexible hybrid generator, a plurality of the power generation fibers 2 are staggered. For example, a plurality of rows of power generating fibers 2 are formed between the upper electrode layer and the lower electrode layer, and the power generating fibers 2 in adjacent rows have different inclination directions, specifically, one row of the power generating fibers 2 is inclined from left to right, and the power generating fibers 2 in adjacent rows are inclined from right to left, so that a plurality of the power generating fibers 2 are formed in a staggered arrangement.

Optionally, in the flexible hybrid generator, the piezoelectric generating fibers and the friction generating fibers are intertwined. In one embodiment of the present invention, the piezoelectric power generating fibers and the frictional power generating fibers are intertwined and woven into a fiber bundle, and both ends of the fiber bundle are fixed to the upper electrode layer 1 and the lower electrode layer 3, respectively. For example, the number of the piezoelectric power generation fibers is the same as that of the friction power generation fibers, and one of the piezoelectric power generation fibers and one of the friction power generation fibers are spirally wound and woven with each other to form a fiber bundle. The fiber bundle may be formed by spirally winding the piezoelectric power generating fiber and the friction power generating fiber with each other to improve a rebound effect and a friction effect.

The composite fiber has high output power and good flexibility, and can avoid the problems that the structure of a nano generator device is easily damaged and the service life of the nano generator device is shortened due to various deformations such as stretching, twisting and bending generated in the movement process of a human body.

The flexible composite material with the high piezoelectric effect and the flexible piezoelectric composite material with the stretchable electrode are prepared. Specifically, polyvinylidene fluoride nano-fibers with conductive fabric electrodes, polyvinylidene fluoride-ferric oxide nano-composite fiber materials and polydimethylsiloxane/lead-free piezoelectric ceramic composite fiber materials are prepared. In addition, the present invention improves energy conversion efficiency and energy density by mixing a conductive nano material (such as silver nanowires, graphite nanoparticles, or silver nanoparticles) with a piezoelectric material. Therefore, the hybrid nano-generator is realized by utilizing the piezoelectric effect and the triboelectric effect, the principle of the nano-generator is fused with the textile technology, the self-powered sensing and monitoring function is realized, the user experience is greatly improved, the conversion efficiency of the flexible triboelectric nano-generator is improved, the energy is stored, and a foundation is laid for the self-powered sensing system.

The present invention also provides a flexible self-charging device comprising a flexible hybrid generator as described above, in order to amplify the performance of the flexible hybrid generator, an ultra-lightweight flexible self-charging system is constructed comprising a tribo-piezoelectric nano-generator (flexible hybrid generator) based on electrospun fibers as an energy collector, a super capacitor (EP-SC) based on an electrospun fiber mesh membrane as an energy storage device, the energy generated by the pulse output of the tribo-piezoelectric hybrid generator charges the capacitor formed by the textile layer as a power source for wearable electronics, and in particular, the extraction circuit is designed, studied and optimized using commercially available integrated circuits (L TC3588-1 and L TC 4071) to increase the power output.

Use of a flexible hybrid generator in the manufacture of a garment. The flexible hybrid generator has very good flexibility, and can be applied to clothes for collecting mechanical energy generated by human activities. Specifically, the flexible hybrid generator can be tightly attached to the skin of a human body under the external stress in the form of continuous twisting, stretching, bending and shearing, so that stable and high-precision measurement can be obtained.

Furthermore, the flexible hybrid generator of the invention has the advantages of light weight, small size, high sensitivity and durability, so that the flexible hybrid generator can be used in the technology for measuring the physiological signals of the old. Specifically, the invention combines human body activity and a soft actuator based on a nano generator, so that the soft sensing electronic device can execute various active sensing and interaction tasks, thereby establishing a self-driven wearable human body signal sensing system.

According to the friction-piezoelectric hybrid nano power generation device based on the spiral structure spacer fabric, a flexible sensing system of a textile fabric is obtained, fabric sensing is achieved, the system has the characteristics of extensibility and flexibility and deformation, the system can be well attached to the uneven body surface, the related parameters of the body can be measured by the sensing device more easily, and the body attachment performance and accuracy of the sensing system are improved. Furthermore, the combined sensor forms an ultra-light self-driven wearable sensing system.

The self-driven wearable sensing system provided by the invention has the comfort of the fabric and the function of drawing biological signals, and is simple, convenient, safe, low in cost, low in energy consumption, soft, light, easy to deform and resistant to bending.

In conclusion, the polyvinylidene fluoride nano-fiber/silver nanowire is used as the piezoelectric material, the polydimethylsiloxane/nano-graphite is used as the triboelectric material, the energy conversion output power is effectively improved by optimizing the respective proportion ratio, the optimized composite material is applied to the textile base design of the spiral spacing structure, the energy conversion efficiency is further improved, and the design and optimization of the integrated circuit are combined to construct the ultra-light flexible self-driven wearable sensing system.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.