Flexible hybrid generator, preparation method and application, flexible self-charging device

Abstract

The present invention discloses a flexible hybrid generator, a preparation method and application, and a flexible self-charging device. The flexible hybrid generator includes: an upper electrode layer, a lower electrode layer, and a plurality of power generation fibers connected to the upper electrode layer at one end and the lower electrode layer at the other end; the power generation fibers include piezoelectric power generation fibers and friction power generation fibers; the piezoelectric power generation fibers are polyvinylidene fluoride nanofibers / silver nanowire composite fibers; the friction power generation fibers are polydimethylsiloxane / nanographite composite fibers. The polyvinylidene fluoride nanofibers / silver nanowires described in the present invention are used to make piezoelectric generators, and the polydimethylsiloxane / nanographite is used to make friction generators, thereby obtaining a friction piezoelectric hybrid generator, which can greatly improve the output power.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and in particular to a flexible hybrid generator, a preparation method and application thereof, and a flexible self-charging device. Background Art

[0002] With the rapid development of wearable sensors in recent years, wearable electronic devices have become an indispensable part of our lives. The operation of electronic devices such as sports bracelets, smart phones and some wearable medical sensor devices used to monitor human movement and health status cannot be separated from the supply of energy. With the development trend of miniaturization and lightness, the energy supply problem of electronic devices, such as short battery life and the need for frequent charging or replacement of batteries, has brought many inconveniences to people and has become an important factor hindering its further development. Not only that, the large amount of continuous small power consumption also has a certain impact on the sustainable development of the environment.

[0003] However, the mechanical energy generated by human activities every day has the advantages of continuity, no restrictions on the environment and weather, and no pollution. Collecting the mechanical energy of human activities to generate electrical energy to supply these electronic devices can extend the battery life of electronic devices. However, the flexible generator in the prior art has the problem of low output power.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a flexible hybrid generator and a preparation method and application, and a flexible self-charging device, aiming to solve the problem of low output power of the flexible generator in the prior art.

[0006] A flexible hybrid generator, comprising:

[0007] An upper electrode layer, a lower electrode layer, and a plurality of power generation fibers having one end connected to the upper electrode layer and the other end connected to the lower electrode layer;

[0008] Wherein, the power generation fibers include piezoelectric power generation fibers and friction power generation fibers;

[0009] The piezoelectric power generation fiber is a polyvinylidene fluoride nanofiber / silver nanowire composite fiber;

[0010] The friction power generation fiber is polydimethylsiloxane / nanographite composite fiber.

[0011] In the flexible hybrid generator, the power generation fiber is a spiral power generation fiber.

[0012] A method for preparing the flexible hybrid generator as described above, comprising:

[0013] Preparation of polyvinylidene fluoride nanofiber / silver nanowire composite fibers;

[0014] Preparation of polydimethylsiloxane / nanographite composite fibers;

[0015] The two ends of the polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber are respectively fixed in the upper electrode layer and the lower electrode layer to prepare a flexible hybrid generator.

[0016] The method for preparing the flexible hybrid generator, wherein the preparation of the polyvinylidene fluoride nanofiber / silver nanowire composite fiber specifically comprises:

[0017] preparing a mixed solution containing polyvinylidene fluoride iron and silver nanowires;

[0018] The mixed solution is subjected to electrostatic spinning to prepare polyvinylidene fluoride nanofiber / silver nanowire composite fibers.

[0019] The method for preparing the flexible hybrid generator, wherein in the mixed solution containing polyvinylidene fluoride iron and silver nanowires, the mass percentage of the polyvinylidene fluoride iron is 18wt%.

[0020] The method for preparing the flexible hybrid generator, wherein in the mixed solution containing polyvinylidene fluoride iron and silver nanowires, the mass percentage of the silver nanowires is 2.0wt%.

[0021] The preparation method of the flexible hybrid generator, wherein the polydimethylsiloxane / nanographite composite fiber is a 0.5 Na 0.5 Polydimethylsiloxane / nanographite composite fibers with TiO3 particles.

[0022] The method for preparing the flexible hybrid generator, wherein the mass percentage of the nano-graphite particles in the polydimethylsiloxane / nano-graphite composite fiber is 3.0wt%.

[0023] A flexible self-charging device, comprising: the flexible hybrid generator as described above.

[0024] An application of the flexible hybrid generator as described above in making clothes.

[0025] Beneficial effect: In the flexible hybrid generator described in the present invention, the polyvinylidene fluoride nanofiber / silver nanowire composite fiber is used to make a piezoelectric generator, and the polydimethylsiloxane / nanographite composite fiber is used to make a friction generator. After the two are compounded, a friction piezoelectric hybrid generator is obtained, wherein the polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber have a higher dielectric constant, can reduce dielectric loss, and can greatly improve the output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the flexible hybrid generator described in the present invention. DETAILED DESCRIPTION

[0027] The present invention provides a flexible hybrid generator and a preparation method and application thereof, and a flexible self-charging device. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] like Figure 1 As shown, the present invention provides a flexible hybrid generator, which includes:

[0029] An upper electrode layer 1, a lower electrode layer 3, and a plurality of power generation fibers 2, one end of which is connected to the upper electrode layer 1 and the other end of which is connected to the lower electrode layer 3;

[0030] Wherein, the power generation fiber 2 includes piezoelectric power generation fiber and friction power generation fiber;

[0031] The piezoelectric power generation fiber is a polyvinylidene fluoride nanofiber / silver nanowire composite fiber;

[0032] The friction power generation fiber is polydimethylsiloxane / nanographite composite fiber.

[0033] In the flexible hybrid generator, each of the polyvinylidene fluoride nanofiber / silver nanowire composite fibers and the polyvinylidene fluoride nanofiber / silver nanowire composite fibers constitute a nanogenerator; multiple power generation fibers 2 are regularly or staggeredly arranged between the upper electrode layer 1 and the lower electrode layer 3, so that the friction power generation fibers can generate electricity by friction with the fibers in contact with them, and the piezoelectric power generation fibers generate electricity during the extrusion process, that is, the multiple power generation fibers 2 constitute a hybrid power generation layer; the electrode materials of the upper and lower layers are connected through the 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 material is conductive fiber cloth.

[0034] In the flexible hybrid generator described in the present invention, the polyvinylidene fluoride nanofiber / silver nanowire composite fiber is used to make a piezoelectric generator, and the polydimethylsiloxane / nanographite composite fiber is used to make a friction generator. After the two are compounded, a friction piezoelectric hybrid generator is obtained, wherein the polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber have a higher dielectric constant, can reduce dielectric loss, and can greatly improve the output power.

[0035] It can be seen that the flexible hybrid generator of the present invention can overcome the defects of low output voltage of a single piezoelectric nanogenerator and low output current of a single friction nanogenerator, and can improve the output power density of the composite nanogenerator.

[0036] Furthermore, the power generation fiber 2 is a spiral power generation fiber 2. The spiral power generation fiber 2 has a spring-like structure, and therefore, can also be called a spring-like power generation fiber 2. By making the power generation fiber 2 into a spiral power generation fiber 2, the flexible hybrid generator can have good compression resilience performance.

[0037] The spiral power-generating fibers 2 are intertwined with each other to form a porous three-dimensional structure, which can show good compression resilience when pressure is applied. This performance can reduce the most common problem in current sensors: the hysteresis effect, and can therefore be used to make pressure sensors.

[0038] In addition, the flexible hybrid generator can also be provided with a spacer fabric layer, for example, between the upper electrode layer 1 and the lower electrode layer 3, and the spacer fabric layer can be made of high elastic fiber with a spiral structure, which is used to further improve the resilience between the upper electrode layer 1 and the lower electrode layer 3. It can be seen that the present invention prepares a friction-piezoelectric hybrid nanogenerator with a spacer fabric, thereby improving the working efficiency of the device. The power generation fiber 2 with a spiral structure has high elasticity, and the excellent spatial structure of the spacer fabric has good compression resilience and other unique mechanical properties. It can rebound quickly to generate electrical energy when under pressure, and the mechanical energy absorbed under pressure can be more effectively converted into electrical energy.

[0039] Furthermore, the present invention provides a method for preparing a flexible hybrid generator, which comprises:

[0040] Preparation of polyvinylidene fluoride nanofiber / silver nanowire composite fibers;

[0041] Preparation of polydimethylsiloxane / nanographite composite fibers;

[0042] The polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber are fixed in the upper electrode layer 1 and the lower electrode layer 3 respectively to prepare a flexible hybrid generator.

[0043] The present invention proposes and prepares a silver nanowire modified composite material by comparing the performance of polyvinylidene fluoride-trivalent iron / silver nanowires and polydimethylsiloxane / graphite nanocomposites with polyvinylidene fluoride / nano boron oxide nanofiber membranes and polyvinylidene fluoride-trivalent iron nanofibers to improve the power generation performance of the generator. Specifically, the peak open circuit voltage and peak current under 5.1MΩ of the polyvinylidene fluoride-trivalent iron / silver nanowire and polydimethylsiloxane / graphite nanocomposites are 33.97V and 4μA respectively, and the peak compression force is 1500N. The maximum current of polyvinylidene fluoride / nano boron oxide nanofiber membranes and polyvinylidene fluoride-trivalent iron nanofibers is 0.78μA, the maximum voltage is 27.1V, and the maximum output power is 0.078mW. The present invention prepares a silver nanowire modified composite material to improve the power generation performance of the generator, and the results show that it has good output performance and output stability.

[0044] In one implementation of the present invention, the step of preparing polyvinylidene fluoride nanofibers / silver nanowires specifically comprises:

[0045] preparing a mixed solution containing polyvinylidene fluoride iron and silver nanowires;

[0046] The mixed solution containing polyvinylidene fluoride iron and silver nanowires is subjected to electrostatic spinning to prepare polyvinylidene fluoride nanofiber / silver nanowire composite fibers.

[0047] In the actual operation of electrospinning, first, the precursor solution formed by mixing and stirring zinc oxide + ethanol + DMF + acetic acid + PVP is loaded into the syringe, and a positive high voltage is applied to the end of the needle. The receiving device is connected to a negative high voltage or grounded, so that an electric field is formed between the needle tip and the receiving device. Under the action of the electric field, the charged solution will generate an electric field force in the opposite direction of the surface tension of the solution. As the applied voltage increases, the electric field force will increase accordingly. When the electric field force reaches a certain value, under the combined action of the electric field force and the surface tension, the droplet at the needle tip will be pulled into a cone, that is, a Taylor cone is formed. When the electric field force increases further, the droplet will overcome the surface tension to form a jet. Before the jet reaches the receiving device, the jet will continue to "whip" to continue to split and refine the jet, and the solvent will continue to evaporate and solidify. Finally, it is deposited on the receiving device. The relevant parameters of electrospinning are as follows: solution propulsion rate is about 0.3μL. Polymer viscosity is 0.03-0.08g / m1. Spinning voltage is 18-22kV, curing distance is 18-25cm. Humidity is controlled within 60%.

[0048] In order to better study the performance of flexible hybrid generators, the present invention prepared piezoelectric composite materials with different proportions of silver nanowires. Specifically, during the preparation process, the present invention experimented with silver nanowires with mass fractions of 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, and 3.0wt%, and found that the piezoelectric polymer nanofiber with 2.0wt% silver nanowires had the best experimental effect.

[0049] In one implementation of the present invention, in the mixed solution of polyvinylidene fluoride iron and silver nanowires, the mass percentage of polyvinylidene fluoride iron is 18wt%; the mass percentage of silver nanowires is 2.0wt%. Experiments have found that when the proportion of silver nanowires is 2.0wt%, the prepared composite material has the best effect.

[0050] In one implementation of the present invention, the polyvinylidene fluoride iron and silver nanowires can be firstly made into polyvinylidene fluoride nanofiber / silver nanowire composite fibers by electrostatic spinning, and then the polyvinylidene fluoride nanofiber / silver nanowire composite fibers are spun into polyvinylidene fluoride nanofiber / silver nanowire film, and the obtained polyvinylidene fluoride nanofiber / silver nanowire film can also be used to make piezoelectric power generation film. Wherein, the diameter of the polyvinylidene fluoride nanofiber / silver nanowire composite fiber ranges from 200nm to 700nm, and the diameter of the silver nanowire is 120nm.

[0051] Specifically, a piezoelectric generator is made of polyvinylidene fluoride nanofiber (PVDF) / silver nanowire (Polyvinylidenefluoridenanofibers / Silver nanowires) composite fiber. The composite fiber containing 2.0wt% silver nanowires in 18wt% polyvinylidene fluoride iron solution is made by electrospinning. The diameter of the polyvinylidene fluoride nanofiber / silver nanowire composite fiber ranges from 200nm to 700nm, and the diameter of the silver nanowire is about 120nm. The peak open circuit voltage and the peak current at 5.1MΩ are 33.97V and 4μA respectively. The peak compression force is 1500N respectively.

[0052] The present invention uses polydimethylsiloxane (PDMS) / nano-graphite composite fibers to prepare a friction generator. In one implementation of the present invention, the mass percentage of the nano-graphite particles in the polydimethylsiloxane (PDMS) / nano-graphite composite fibers is 3.0wt%. Experiments have found that the optimal ratio of nano-graphite particles in the polydimethylsiloxane / nano-graphite composite fibers is 3.0wt%. When the ratio of nano-graphite particles is greater than 3.0wt%, a local conductive network will be formed, which will deteriorate the performance of the device.

[0053] In one implementation of the present invention, the 0.5 Na 0.5 TiO3 particles and nano-graphite are dispersed in the polydimethylsiloxane, and Bi-containing 0.5 Na 0.5 Polydimethylsiloxane (PDMS) / nanographite composite fibers with TiO3 particles.

[0054] The piezoelectric generator and the friction generator in the present invention play two roles: generating piezoelectricity and friction electricity. When a force is applied to the upper electrode, the hybrid generator can generate a peak open circuit voltage and a peak current, generating a relatively low resistance load.

[0055] In one implementation of the present invention, the polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber are composited to prepare a flexible hybrid generator, specifically including: using the polyvinylidene fluoride nanofiber / silver nanowire composite fiber as a piezoelectric power generation fiber; using the polydimethylsiloxane / nanographite composite fiber as a friction power generation fiber. The two ends of the polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber are respectively fixed in the upper electrode layer 1 and the lower electrode layer 3 to prepare a flexible hybrid generator, and the fixing method can be adhesive fixing. Among them, the polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber are further woven by a textile process to form a textile membrane, which is then connected to the upper electrode layer 1 and the lower electrode layer 3. The material of the electrode layer can be conductive fiber cloth, but is not limited to this.

[0056] In one embodiment of the present invention, the material of the power generation fiber 2 can be a composite wire in which the polyvinylidene fluoride nanofiber / silver nanowire, the polydimethylsiloxane / nanographite, and the electrode layer material are alternately coated. Specifically, the composite wire is a fiber with a multilayer structure, wherein the adjacent layers are made of different materials, and each layer of material is selected from one of polyvinylidene fluoride nanofiber / silver nanowire, the polydimethylsiloxane / nanographite, and the electrode layer material, and the layers can move relative to each other to a certain extent. In other words, since the layers in the composite wire can move relative to each other, for example, during the stretching and recovery process, displacement and friction will occur between different layers, thereby converting mechanical energy into electrical energy, that is, the composite wire is a fiber with power generation capability.

[0057] The preparation method of the composite wire can be prepared by a coating method. For example, by sequentially coating polyvinylidene fluoride nanofiber / silver nanowire, the polydimethylsiloxane / nanographite, and the electrode layer material on the core fiber. The core fiber can be a high elastic fiber material or one of the above materials. The preparation method of the composite wire can also be by respectively making the coated polyvinylidene fluoride nanofiber / silver nanowire, the polydimethylsiloxane / nanographite, and the electrode layer material into tubular fibers, wherein the inner diameters of the tubular fibers are different, and by nesting the tubular fibers with different inner diameters, a composite wire with a multilayer structure is formed.

[0058] Optionally, in the flexible hybrid generator, a plurality of the power generation fibers 2 are staggered. For example, a plurality of columns of power generation fibers 2 are formed between the upper electrode layer and the lower electrode layer, and the power generation fibers 2 in adjacent columns are tilted in different directions. Specifically, one column of power generation fibers 2 tilts from left to right, while the power generation fibers 2 in the adjacent column tilt from right to left, thereby forming a staggered arrangement of the plurality of power generation fibers 2.

[0059] Optionally, in the flexible hybrid generator, the piezoelectric power generation fiber and the friction power generation fiber are intertwined. In one embodiment of the present invention, the piezoelectric power generation fiber and the friction power generation fiber are intertwined and woven into a fiber bundle, and then the two ends of the fiber bundle are respectively fixed in the upper electrode layer 1 and the lower electrode layer 3. For example, the number of the piezoelectric power generation fibers is the same as that of the friction power generation fibers, wherein one piezoelectric power generation fiber and one friction power generation fiber are spirally intertwined and woven into a fiber bundle. The fiber bundle can be formed by the piezoelectric power generation fiber and the friction power generation fiber being spirally intertwined to improve the rebound effect and the friction effect.

[0060] The composite fiber of the present invention has high output power and good flexibility, and can avoid the problem that the structure of the nanogenerator device is easily destroyed and its service life is shortened due to various deformations such as stretching, twisting, bending, etc. produced by the human body during movement.

[0061] The present invention prepares a flexible composite material with high piezoelectric effect and a flexible piezoelectric composite material with a stretchable electrode. Specifically, the present invention prepares polyvinylidene fluoride nanofibers and polyvinylidene fluoride-iron oxide nanocomposite fiber materials and polydimethylsiloxane / lead-free piezoelectric ceramic composite fiber materials with conductive fabric electrodes. In addition, the present invention improves energy conversion efficiency and energy density by mixing conductive nanomaterials (such as silver nanowires, graphite nanoparticles or silver nanoparticles) with piezoelectric materials. It can be seen that the present invention utilizes piezoelectric effect and triboelectric effect to realize a hybrid nanogenerator, and integrates the principle of nanogenerator with textile technology. While realizing the self-powered sensing and monitoring function, it greatly improves the user experience, and improves the conversion efficiency of flexible friction nanogenerators, stores energy, and lays the foundation for self-powered sensing systems.

[0062] The present invention also provides a flexible self-charging device, which includes: a flexible hybrid generator as described above. In order to amplify the performance of the flexible hybrid generator, the present invention constructs an ultra-light flexible self-charging system, which includes a triboelectric nanogenerator (flexible hybrid generator) based on electrospun fibers as an energy collector; a supercapacitor (EP-SC) based on an electrospun fiber mesh film as an energy storage device. The energy generated by the pulse output of the triboelectric hybrid generator will be charged in the capacitor formed by the textile layer as a power source for wearable electronic devices. Specifically, the extraction circuit is designed, studied and optimized using commercial integrated circuits (LTC3588-1 and LTC 4071) to improve power output.

[0063] A flexible hybrid generator is used in the preparation of clothing. The flexible hybrid generator of the present invention has very good flexibility and can be applied to clothing to collect mechanical energy generated by human activities. Specifically, the flexible hybrid generator of the present invention can fit closely to human skin under external forces in the form of continuous twisting, stretching, bending and shearing to obtain stable and high-precision measurements.

[0064] Furthermore, the flexible hybrid generator of the present invention has the properties of light weight, small size, high sensitivity and durability, which enables it to be used in the technology of measuring physiological signals of the elderly. Specifically, the present invention combines human activities with soft actuators based on nanogenerators to enable soft sensing electronic devices to perform various active sensing and interaction tasks, thereby establishing a self-driven wearable human signal sensing system.

[0065] The present invention obtains a flexible sensing system for textile fabrics through a friction-piezoelectric hybrid nano-generator based on spiral structure spacer fabrics to achieve fabric sensing. The system has the characteristics of being ductile and easy to bend and deform, and can better fit the uneven body surface, making it easier for the sensor device to measure relevant parameters of the body, and improving the body fit and accuracy of the sensing system. Furthermore, the combined sensor constitutes an ultra-light self-driven wearable sensing system.

[0066] The self-driven wearable sensor system of the present invention has both the comfort of fabric and the functionality of acquiring biological signals, and is simple, convenient, safe, low-cost, low-energy, soft, light, easily deformable and resistant to bending.

[0067] In summary, the present invention adopts polyvinylidene fluoride nanofiber / silver nanowire as piezoelectric material and polydimethylsiloxane / nanographite as triboelectric material, and effectively improves the energy conversion output power by optimizing their respective ratios. The optimized composite material is applied to the textile-based design of the spiral spacer structure to further improve the energy conversion efficiency. Combined with the design and optimization of integrated circuits, an ultra-light, flexible, self-driven wearable sensing system is constructed.

[0068] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A flexible hybrid generator, characterized in that: include: An upper electrode layer, a lower electrode layer, and a plurality of power generation fibers, one end of which is connected to the upper electrode layer and the other end of which is connected to the lower electrode layer; the power generation fibers are spiral power generation fibers; Wherein, the power generation fibers include piezoelectric power generation fibers and friction power generation fibers; The piezoelectric power generation fiber is a polyvinylidene fluoride nanofiber / silver nanowire composite fiber; The triboelectric fiber is a polydimethylsiloxane / nanographite composite fiber; the mass percentage of the nanographite particles in the polydimethylsiloxane / nanographite composite fiber is 3.0wt%.

2. A method for preparing the flexible hybrid generator as claimed in claim 1, characterized in that: include: Preparation of polyvinylidene fluoride nanofiber / silver nanowire composite fibers; Preparation of polydimethylsiloxane / nanographite composite fibers; The mass percentage of the nano-graphite particles in the polydimethylsiloxane / nano-graphite composite fiber is 3.0wt%; The two ends of the polyvinylidene fluoride nanofiber / silver nanowire composite fiber and the polydimethylsiloxane / nanographite composite fiber are respectively fixed in the upper electrode layer and the lower electrode layer to prepare a flexible hybrid generator.

3. The method for preparing a flexible hybrid generator according to claim 2, characterized in that: The preparation of polyvinylidene fluoride nanofiber / silver nanowire composite fiber specifically comprises: preparing a mixed solution containing polyvinylidene fluoride iron and silver nanowires; The mixed solution is subjected to electrostatic spinning to prepare polyvinylidene fluoride nanofiber / silver nanowire composite fibers.

4. The method for preparing a flexible hybrid generator according to claim 3, characterized in that: In the mixed solution containing polyvinylidene fluoride iron and silver nanowires, the mass percentage of the polyvinylidene fluoride iron is 18wt%.

5. The method for preparing a flexible hybrid generator according to claim 3, characterized in that: In the mixed solution containing polyvinylidene fluoride iron and silver nanowires, the mass percentage of the silver nanowires is 2.0wt%.

6. The method for preparing the flexible hybrid generator according to claim 5, characterized in that: The polydimethylsiloxane / nanographite composite fiber contains Bi 0.5 Na 0.5 Polydimethylsiloxane / nanographite composite fibers with TiO3 particles.

7. A flexible self-charging device, characterized in that: include: The flexible hybrid generator as claimed in claim 1.

8. Use of the flexible hybrid generator as claimed in claim 1 in making clothes.

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