Wearable device continuous energy supply system device and method based on energy collection technology

Abstract

The invention discloses a system device and method for realizing continuous energy supply of wearable equipment by applying an energy collection technology, and aims to break through the bottlenecks of the wearable equipment in the aspects of efficient energy conversion, continuous and stable energy supply and perfect conformality. According to the system device, thermoelectric rubber is used as a core functional material, through an integrated flexible structure design, the system device comprises a heat conduction layer in contact with human skin, a middle thermoelectric conversion layer and a heat dissipation layer in contact with the environment, and an efficient thermoelectric power generation unit is formed. The temperature difference between the human body and the environment is utilized, heat energy is converted into electric energy through the thermoelectric rubber, and power is supplied to the wearable device through the flexible circuit. The thermoelectric rubber has high flexibility (the tensile strength is 850% or above, and the rebound rate after 150% tensile is larger than or equal to 90%) and high thermoelectric conversion efficiency (the room-temperature thermoelectric figure of merit is larger than or equal to 0.49), can perfectly fit the human skin and adapt to dynamic deformation, and continuous self-energy supply of wearable equipment is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wearable device power supply, in particular to a wearable device continuous power supply system device and method based on energy harvesting technology. BACKGROUND

[0002] With the popularity of smart watches, health monitoring devices and other wearable devices, the problem of continuous power supply has become a key bottleneck restricting the development of technology. In the existing power supply scheme, although the traditional inorganic thermoelectric material has high conversion efficiency, it is brittle and difficult to adapt to human motion; although the organic material has good flexibility, the performance decays obviously after stretching, and the skin adhesion is poor. Therefore, how to realize high-efficiency energy conversion, continuous and stable power supply and perfect conformability at the same time is a technical problem to be solved in the field. SUMMARY

[0003] The technical problem to be solved is to overcome the defects of "rigidity and flexibility" in the existing wearable device power supply technology, and realize the synergistic optimization of high-efficiency energy conversion, continuous and stable power supply and perfect conformability.

[0004] Technical scheme: The present application is based on the construction of a system device based on "thermoelectric rubber" material. The material is fused by rigid semiconductor polymer and flexible rubber through Hansen solubility parameter screening to form a nanofiber network (conducting channel), and is endowed with high ductility and resilience by azo crosslinking agent, and the thermoelectric conversion efficiency is improved by special dopant. The system device adopts a flexible integrated structure of "heat conduction layer - thermoelectric rubber layer - heat dissipation layer", which can closely adhere to the human skin, utilize the temperature difference between the human body and the environment to generate electricity continuously, and realize stable power supply through flexible circuit and energy storage unit.

[0005] Beneficial effects:

[0006] Efficiency: The room temperature thermoelectric figure of merit of thermoelectric rubber reaches 0.49, which is close to or even exceeds the existing flexible inorganic materials, and the energy conversion efficiency is high;

[0007] Flexibility: It can be stretched by more than 850%, and the resilience rate is greater than or equal to 90% after 150% stretching, which can adapt to the dynamic deformation of human motion;

[0008] Conformability: The overall thickness is less than or equal to 0.5mm, the edge is circularly transitioned, and it is seamlessly adhered to the skin, so the wearing comfort is high;

[0009] Continuity: Through the combination of temperature difference power generation and energy storage, 24-hour continuous power supply is realized, and frequent charging is not needed. BRIEF DESCRIPTION OF DRAWINGS

[0010] DRAWINGS:

[0011] Figure 1 is a schematic diagram of the layered structure of a smartwatch wearable wrist system, showing the positional relationship of the heat-conducting layer, thermoelectric rubber layer, heat dissipation layer, and flexible circuit from top to bottom.

[0012] Figure 2 is a flowchart of the system device power supply method.

[0013] Illustration labels: Flexible thermoelectric conversion module 100, thermoelectric rubber 11, rigid semiconductor polymer 11a, flexible rubber 11b, thermally conductive layer 200, heat dissipation layer 300, flexible circuit 400, flexible energy storage unit 500. Detailed Implementation

[0014] Example 1, System device composition:

[0015] like Figure 1 As shown, a wearable device with a continuous power supply system based on energy harvesting technology includes: a flexible thermoelectric conversion module 100, the core material of which is thermoelectric rubber 11. The thermoelectric rubber 11 is formed by uniformly fusing rigid semiconductor polymer 11a and flexible rubber 11b at the microscopic level, and has a nanofiber network inside. It achieves high ductility and resilience through azo crosslinking agents. The overall thickness of the flexible thermoelectric conversion module 100 is ≤0.5mm, the edges are rounded, and medical-grade silicone pressure-sensitive adhesive is used to fix it to human skin.

[0016] The heat-conducting layer 200 is disposed on one side of the flexible thermoelectric conversion module 100 and is used to contact human skin and conduct human body heat to the thermoelectric rubber 11.

[0017] The thermally conductive layer 200 is made of graphene film with a thickness of 5-10 μm, and the heat dissipation layer is made of flexible polyimide nanopillar array with a thickness of 10-20 μm;

[0018] The thermoelectric rubber 11, with a thickness of 0.3 mm, is fused from rigid semiconductor polymer 11a (such as polythiophene derivative) and flexible rubber 11b (such as natural rubber) through screening using Hansen solubility parameters, forming a nanofiber network inside. Azo crosslinking agents (such as 4,4'-diphenylmethane diisocyanate) are added to achieve high elasticity, and FeCl3 is doped as a performance catalyst to improve the thermoelectric figure of merit to 0.49.

[0019] The thermoelectric rubber 11 has an elongation of ≥850%, a resilience of ≥90% after 150% stretching, and a thermoelectric figure of merit of ≥0.49 at room temperature.

[0020] The heat dissipation layer 300 is arranged on the other side of the flexible thermoelectric conversion module 100, adopts a flexible polyimide nano pillar array with a thickness of 15μm, increases the contact area with air, and forms a temperature difference on both sides of the thermoelectric rubber 11.

[0021] The flexible circuit 400 is electrically connected with the flexible thermoelectric conversion module 100, and is used for transmitting the electric energy generated by the thermoelectric rubber 11 to a wearable device.

[0022] The flexible circuit 400 adopts a silver nanowire printed circuit, has a thickness of 5μm, is electrically connected with the thermoelectric rubber 11, has an output voltage of 3.3V, and is suitable for mainstream wearable devices.

[0023] The flexible energy storage unit 500 adopts a carbon nanotube / conductive polymer composite supercapacitor, has a capacity of 100mAh, and can be stretched by 500%, and is used for storing the excess electric energy generated by the thermoelectric rubber 11. The flexible energy storage unit 500 is a flexible solid-state supercapacitor, and the flexible energy storage unit 500 is electrically connected with the flexible circuit 400.

[0024] As shown in Figure 2 A wearable device continuous energy supply system device energy supply method flow is provided based on an energy collection technology.

[0025] S1, the device is pasted on the inner side of the wrist through medical grade silicone pressure sensitive adhesive, the heat conduction layer contacts the skin, and the heat dissipation layer is exposed to air;

[0026] S2, the human body temperature (about 36℃) and the environment temperature (about 25℃) form a temperature difference of 11℃, the thermoelectric rubber converts the temperature difference into electric energy (open circuit voltage about 0.8V) through the Seebeck effect;

[0027] S3, the flexible circuit stabilizes the voltage to 3.3V, and directly supplies power to the smart watch (standby power consumption about 10mA);

[0028] S4, when the power generation exceeds the power consumption (such as when the temperature difference increases due to the decrease of the environment temperature), the excess electric energy (about 20mA) is stored in the supercapacitor; when the environment temperature rises to cause the power generation to decrease, the supercapacitor releases electric energy to supplement the power supply, and ensures the stable operation of the device.

[0029] In step S1, the heat conduction layer enhances the conduction efficiency of the human body heat to the thermoelectric rubber, and the heat dissipation layer enhances the heat exchange efficiency of the thermoelectric rubber and the environment, so that the temperature difference is maintained at 2-5℃.

[0030] In step S4, the charging and discharging of the flexible energy storage unit is intelligently controlled through a flexible thin film chip, and the flexible thin film chip dynamically adjusts the output voltage according to the power consumption of the wearable device.

[0031] The above merely provides the preferred embodiment of the present application, and not intended to limit the protection scope of the present application. Whatever modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall in the protection scope of the present application.

Claims

1. A wearable device continuous energy supply system apparatus based on energy harvesting technology, characterized by, The application relates to a flexible thermoelectric conversion module (100), which comprises the following components: a core material of the flexible thermoelectric conversion module is a thermoelectric rubber (11), the thermoelectric rubber (11) is formed by uniformly fusing a rigid semiconductor macromolecule (11a) and a flexible rubber (11b) at a micro level, has a nanofiber network inside, and realizes high ductility and resilience through an azo crosslinking agent; a heat conduction layer (200) is arranged on one side of the flexible thermoelectric conversion module, is used for contacting human skin and conducting human heat to the thermoelectric rubber, and the like; a heat dissipation layer (300) is arranged on the other side of the flexible thermoelectric conversion module, is used for contacting an external environment and dissipating heat, and the like, so that a temperature difference is formed on both sides of the thermoelectric rubber; and a flexible circuit (400) is electrically connected with the flexible thermoelectric conversion module, is used for transmitting electric energy generated by the thermoelectric rubber to a wearable device. The tensile rate of the thermoelectric rubber is greater than or equal to 850%, the resilience rate after 150% stretching is greater than or equal to 90%, and the thermoelectric merit factor at room temperature is greater than or equal to 0.

49. The heat conduction layer adopts a graphene film with a thickness of 5-10 microns, and the heat dissipation layer adopts a flexible polyimide nanopillar array with a thickness of 10-20 microns. The overall thickness of the flexible thermoelectric conversion module (100) is less than or equal to 0.5 mm, the edge is a circular arc transition structure, and medical-grade silicone pressure-sensitive adhesive is adopted to realize fixation with human skin. The application further comprises a flexible energy storage unit (500) which is electrically connected with the flexible circuit (400) and is used for storing excess electric energy generated by the thermoelectric rubber (11), and the flexible energy storage unit (500) is a flexible solid-state supercapacitor.

2. The system apparatus of claim 1, wherein, The application further comprises the following steps:

3. The system apparatus of claim 1, wherein, S1: The system device in any one of claims 1-5 is attached to the surface of human skin through the heat conduction layer, so that the heat dissipation layer is exposed to the external environment, and a temperature difference between the human body and the environment is formed; 4. The system device of claim 1, wherein, S2: The thermoelectric rubber performs thermoelectric conversion by using the temperature difference to generate electric energy; 5. The system of claim 1, wherein, S3: The electric energy is transmitted to the wearable device through the flexible circuit to realize continuous power supply; 6. A method for continuous powering of a wearable device based on energy harvesting technology, characterized in that, S4: When the electric energy generated by the thermoelectric rubber exceeds the instantaneous power consumption of the wearable device, the flexible energy storage unit stores the excess electric energy; and when the electric energy is insufficient, the flexible energy storage unit releases the electric energy to supplement the power supply. In step S1, the heat conduction efficiency of human heat to the thermoelectric rubber is enhanced through the heat conduction layer, and the heat exchange efficiency of the thermoelectric rubber and the environment is enhanced through the heat dissipation layer, so that the temperature difference is maintained at 2-5 DEG C. In step S4, the charging and discharging of the flexible energy storage unit is intelligently controlled through a flexible thin film chip, and the flexible thin film chip dynamically adjusts the output voltage according to the power consumption of the wearable device. ​ ​ 7. The method of claim 6, wherein, ​ 8. The method of claim 6, wherein, ​

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