Tag Archives: battery management

Now Screen movies using your phone….!!


A new mini projector prototype could see mobile phone users hosting impromptu movie screenings on makeshift screens such as white towels or walls… without killing the battery. Unlike conventional projectors the prototype doesn’t need an additional illumination system. Instead it relies on a lens system to project images produced by an OLED onto a wall or other flat surface.

Operating without an extra light source offers the dual benefits of reduced size and energy requirements. The prototype is 2.5 cm long, has a diameter of 1.8 cm and needs very little energy. This means the projector could be easily integrated into a mobile phone or PDA without overtaxing the devices’ battery.

Currently the prototype’s OLED display produces a monochrome image with a brightness of 10,000 candelas per square meter, and color images about half that level. By way of comparison, a computer monitor generates about 150-300 candelas per square meter.

The lenses used in the prototype are made of glass, but the development team is working on an optical system that uses plastic lenses. This is because plastic lenses can be embossed, so they can be produced in larger quantities more simply and cheaply than glass lenses.

The mini projector was developed by research scientists at the Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena in cooperation with their partners in the EU project HYPOLED.

Source: Fraunhofer Institute

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Pocket Cellphone Charger

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Product: Fuel-cell recharger

Cost: Initially between $100 and $200; cartridges will cost between $1 and $3.

Company: Lilliputian Systems

Solid-oxide fuel cells can generate electricity using a range of readily available fuels. But because they run very hot–often above 1,000 ºC–they typically require insulation that makes them bulky. A new version employs an insulation technique that keeps the finished device as small as a pack of playing cards. The gadget, which could help keep electronic devices humming on long flights or hikes, runs on cheap butane cartridges; one cartridge packs enough power to recharge a smart phone 20 times. Swap out the cartridge, and it’s ready for 20 more charges. The device is scheduled to go on sale next year.

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Lithium-sulfur batteries Thrice power storage than that of lithium-ion


A research team from the University of Waterloo has synthesized a prototype of a lithium-sulphur rechargeable battery that, thanks to its peculiar nanoscale structure, can store three times the power of a conventional lithium-ion battery in the same volume while being significantly lighter and potentially cheaper to manufacture.

When it comes to reducing our carbon footprint, a clean, long-lasting rechargeable battery could have enormous benefits in a wide range of applications, from efficient energy storage to clean transportation.

Pros and Cons of lithium-sulfur cells


•Delivers much higher energy densities while reducing the cost of the materials used:

•The composite material synthesized by Nazar’s team can supply as much as 84 percent of the theoretical capacity of sulphur – three times the energy density of lithium transition cathodes. This should account for significantly more efficient batteries which will be lighter as well.

•The basic raw materials for the positive electrode (sulfur and carbon) are very inexpensive.


•In terms of safety, because lithium-sulfur batteries typically employ a negative electrode comprised of metallic lithium, there could be safety concerns if the electrode is not adequately protected by a passivating layer. However, the research team seems optimistic that this won’t be impossible to overcome.

•The costs associated with processing, electrolyte, fabrication, etc could be high, still that is highly dependent on the optimization of the materials and the battery configuration.

•Capacity fading can be more of an issue, along with lower volumetric energy and those need to be tackled more fully.


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Dyson Human Energy Harvesting Bracelet

Dyson Energy Bracelet is a gadget that uses Seebeck effect to harness energy and power your mobile phones for a few precious minutes more, when you desperately need it. Lemme explain a bit: The thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa. This typically includes three separately identified effects, the Seebeck effect, the Peltier effect, and the Thomson effect. This is coz three different guys discovered it around the same time, however Peltier–Seebeck and Thomson effects are reversible and Joule heating is not.

The designers explain:

Thanks to the Seebeck effect, the temperature difference between the surface which touch the skin and the other which is in the ambient air allows to produce electricity that is stocked in a battery. When the user needs to recharge a mobile device, he plugs it into the Dyson Energy through a micro-USB port (universal connector imposed to constructors in 2012) and can have some additional minutes in use.

Firstly, we have tested the Peltier element in its most common use: i.e. the creation of heat and coldness on the same component (Seebeck effect), and we have noticed that there was electricity production. We have met an engineer who allowed us to evolve on our project while explaining us that there was not possible to plug the elements serially. Therefore, we chose to work with only one element. As a result of many calculations, we have validated this technology payoff regarding our concept. For instance, some hours are sufficient to power its cellphone for a dozen minutes of communication.

Designers: Mathieu Servais, Camille Lefer, Clément Faydi & Mickaël Denié

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