About charging: battery charging for wearable devices

About charging: Battery charging for wearable devices Wearable devices have become a popular technology, but battery life has become an issue for many scientists and manufacturers. 1. Converting static electricity into usable electrical energy Recently, a team from the National University of Singapore (National University of Singapore) has developed a flexible and compact device that can convert sudden static electricity into usable electrical energy. One end of the device touches the skin surface, and the other end is covered with a layer of gold silicon film. Together with this device, there are silicone rubber columns on each end, which allows for greater power output and greater skin contact. Wearable device power supply The group presented their research results at the 2015 IEEEMEMS conference and proved that burst current can power some devices. By installing the device on the subjects' arms and throat, they can appear 7.3v by making a fist and 7.5v by speaking. As the toilet paper is constantly rubbed, the maximum voltage can reach 90v, which can be directly used to light up the LED light source. The team plans to develop larger batteries in the future so that they can use more of the energy generated by human skin friction. In addition to the power of this resistance battery, there are actually many other discussion methods in the world. For example, a new type of tattoo can convert human sweat into electricity, or use a special earphone to convert our chin into a generator. It seems that there are some special ways to deal with the power supply of future wearable devices. 2. New tattoo: sweat turns into electricity. On August 16, Joseph Wang, a researcher at the University of California (San Diego), invented a temporary smart tattoo that can generate electricity from sweat, which one day can do Powered by mobile phones and other wearable devices. Smart tattoo power supply This kind of tattoo will stick to your skin, detect the chemical lactic acid content in your sweat, and then use the lactic acid to make a micro fuel power cell. When we train to exhaustion, muscles usually have a burning sensation, which is related to the accumulation of lactic acid. As far as muscles are concerned, lactic acid is a waste, and it is an end in itself. Exercise physiologists can now detect lactic acid levels in muscles or blood. When lactic acid is released from sweat, new perception skills are born. Wang created a smart tattoo that uses a sensor to extract electrons from lactic acid to trigger an electric current. Wang estimated that 70 microwatts of electric current can occur per square centimeter of skin. The researchers added the battery to the lactic acid sensor to capture and store current, and then form the so-called biofuel power cell. Whether you are driving or walking, the more you sweat, the more lactic acid you experience, which means your battery can store more energy. At present, this kind of tattoo can only produce a small amount of energy, but the researchers hope that this biofuel-powered battery will one day produce enough energy to drive a smart watch, heart rate monitor or smart phone. Motorola also created a temporary tattoo that can be used to unlock the phone. Maybe it's the next must-have accessory for your phone, maybe it's just a little ink on your body. Solar cells Solar cells are not just for large-scale applications like power plants and street lights. We will see miniature solar cells powering wearable devices. Solar watches without batteries have been in existence for many years. EnergyBioNIcs has recently developed a solar watch, which can not only meet the needs of its own, but also other devices. One problem with using solar cells in wearable devices is that the device requires light to generate electricity, and once the light is blocked, such as under a sleeve, it cannot generate electricity. But from another perspective, it also makes solar cells a good choice for smart clothing, because the flexible battery can even be sewn directly into the fabric. The design goal of traditional solar cells is much stronger sunlight than traditional indoor light sources. In order to solve this problem, people are developing new data to generate electricity indoors, and the efficiency is also improving. 4. Thermoelectric collection Thermoelectric collection uses a physical principle called the Seebeck effect to convert heat into electrical energy. The Perot element is combined with a specific pair of semiconductors, and current can appear only by displaying the temperature difference. In terms of wearable devices, the human body can be used as the hot end, and the environment as the cold end, and the human body emits constant heat. The attack energy depends on the delta value between high and low temperatures. The perot element can collect a lot of energy. For those devices that are close to the skin and require a lot of energy, it has potential. One of the major advantages of thermoelectric recovery is that it has a constant flow of energy, whether it is indoors or outdoors, day or night. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.