none

NEW BATTERY TO STOP OVERHEATING

15-01-2016
by 
in 

An issue that everyone has heard of by this time is the hover boards that are exploding because of overheating.

The conventional battery, which is a lithium-ion are made up of liquid or gel electrolytes that carry the particles between them, the only issue is that if they hit temperatures over 150 degrees, they explode.

"We've designed the first battery that can be shut down and revived over repeated heating and cooling cycles without compromising performance," said chemical engineer, Zhenan Bao.

This is not the first time that researchers have tried to install another battery to stop the over heating. Other attempts have tried to reduce fire hazards by adding flame-retardants and copper separators.

"Unfortunately, these techniques are irreversible, so the battery is no longer functional after it overheats," said one of the researchers, Yi Cui.

The advantage of the new method is that it operated automatically to prevent overheating in the first place.

This is due to the material made of tiny particles of nickel with nanoscale spikes poking out from the surface, with these particles covered in graphene and implanted in a film of elastic polyethylene

"We attached the polyethylene film to one of the battery electrodes so that an electric current could flow through it," said Zheng Chen, who led the research.

"To conduct electricity, the spiky particles have to physically touch one another. But during thermal expansion, polyethylene stretches. That causes the particles to spread apart, making the film non-conductive so that electricity can no longer flow through the battery."

In the initial testing, the researches applied heat to the battery with hot air. When the battery hit a temperature above 70 degrees the polyethylene expanded, causing the battery to shut down, and once cooled, the film shrunk and would allow the battery to resume.

The researches have said that the temperature threshold could be changed depending on the polymer materials.

This new battery will not only be useful in hover boards but will prevent overheating in other devices such as smart phones and notebook laptops.

Related news & editorials

  1. 23.05.2018
    23.05.2018
    by      In
    Energy efficiency is a word pairing that hardly anyone has missed during the last decade of public discussion. It’s been on the agenda for so long already that you might even think the topic is exhausted. So, is there anything new to the theme, asks Axel Savolainen of Control Logic.
    Let’s take... Read More
  2. 22.05.2018
    22.05.2018
    by      In
    Euchner has combined two of its key safety products to create a compact and enhanced protection module for guarding applications.
    The Euchner CTP transponder-coded safety switch is now available mounted on a sturdy lock plate, combined with a Euchner MGB (multifunctional gate box) handle module to... Read More
  3. 22.05.2018
    22.05.2018
    by      In
    RS Components is now supplying an award-winning IoT-based system from Abus said to deliver superior access-control management for small- to medium-sized commercial and industrial buildings.
    The Abus wAppLoxx can manage access to as many as 20 doors in a building or facility. The easy-to-use web-... Read More
  4. 22.05.2018
    22.05.2018
    by      In
    Available now in Australia from Mechtric, the Lovato DMG600 Series of panel-mount digital multimeters provide comprehensive power measurement capabilities to enable optimal control of energy consumption.
    The DMG600 and DMG610 promise high measurement accuracy over a wide range of parameters, with... Read More