Electromagnetic Wearable Power Generation Fiber And Fabric For Biomechanical Energy Harvesting

With the rapid development of computer technology and flexible electronic technology,intelligent wearable electronic presented the explosive growth trend,the intelligent product is wearable,small size,light quality,strong fashion sense characteristics,are widely used in areas such as health care,intelligent energy supply wearable devices are needed to maintain its working condition.Tiny devices are often powered by lithium-ion batteries,which have limited battery life and can render them useless once the batteries run out.In addition,lithium batteries have strict requirements for the working environment.Temperature conditions will affect the safety,performance and life of batteries,which limit the application of smart wearable devices.There is an urgent need to develop an energy capture method to continuously power wearable electronic devices in extreme environments.The human body is rich in biochemical energy,bio-thermal energy and bio-mechanical energy,and a large amount of usable energy can be generated by body heat and movement.For a 69 kg adult,the body can produce more than 100 W of energy through breathing,blood transport and movement.So converting just 1%of the body’s energy into electricity to power electronics could solve the battery’s time-consuming problem.In this thesis,an electromagnetic flexible power generation fabric is proposed,which mainly includes the preparation of 80 wt.%Nd₂Fe₁₄B-TPU magnetic composite material by physical/chemical methods,the preparation of Nd₂Fe₁₄B-TPU magnetic composite fiber with a diameter of 200μm by twin-screw extrusion,and the weaving of 80 wt.%Nd₂Fe₁₄B-TPU magnetic composite fabric by industrial manufacturing methods.The magnetic strength of the magnetized magnetic composite fabric surface is 9 m T In addition,a standard test platform is constructed in this paper.By using linear motion platform and Keithley digital multimeter,the electrical properties of magnetic composite fabric and the output voltage and current under different loads are tested.The output voltage of single-layer magnetic fabric can reach 2 V and the output current can reach 4.5m A,and the interaction between flexible power generation fabric and flexible coil is used to supply power for electronic equipment.Finally,the test shows that Nd₂Fe₁₄B-TPU composite magnetic fabric has good wearability,such as washing resistance,air permeability,tensile resistance,tear resistance,bending resistance and wear resistance.At the same time,it has good adaptability to extreme environments,such as high temperature,low temperature,acidity,alkalinity and human sweat.