Featured Research

from universities, journals, and other organizations

New way to determine amount of charge remaining in battery

Date:
October 9, 2012
Source:
North Carolina State University
Summary:
Researchers have developed a new technique that allows users to better determine the amount of charge remaining in a battery in real time. That's good news for electric vehicle drivers, since it gives them a better idea of when their car may run out of juice.

Researchers from North Carolina State University have developed a new technique that allows users to better determine the amount of charge remaining in a battery in real time. That's good news for electric vehicle drivers, since it gives them a better idea of when their car may run out of juice.

The research is also good news for battery developers. "This improved accuracy will also give us additional insight into the dynamics of the battery, which we can use to develop techniques that will lead to more efficient battery management," says Dr. Mo-Yuen Chow, a professor of electrical and computer engineering at NC State and co-author of the paper. "This will not only extend the life of the charge in the battery, but extend the functional life of the battery itself."

At present, it is difficult to determine how much charge a battery has left. Existing computer models for estimating the remaining charge are not very accurate. The inaccuracy stems, in part, from the number of variables that must be plugged in to the models. For example, the capacity of a battery to hold a charge declines with use, so a battery's history is a factor. Other factors include temperature and the rate at which a battery is charged, among many others.

Existing models only allow data on these variables to be plugged in to the model once. Because these variables -- such as temperature -- are constantly changing, the models can become increasingly inaccurate.

But now researchers have developed software that identifies and processes data that can be used to update the computer model in real time, allowing the model to estimate the remaining charge in a battery much more accurately. While the technique was developed specifically for batteries in plug-in electric vehicles, the approach is also applicable to battery use in any other application.

Using the new technique, models are able to estimate remaining charge within 5 percent. In other words, if a model using the new technique estimates a battery's state of charge at 48 percent, the real state of charge would be between 43 and 53 percent (5 percent above or below the estimate).

The paper, "Adaptive Parameter Identification and State-of-Charge Estimation of Lithium-Ion Batteries," will be presented at the 38th Annual Conference of the IEEE Industrial Electronics Society in Montreal, Oct. 25-28. Lead author of the paper is Habiballah Rahimi-Eichi, a Ph.D. student at NC State. The research was supported by the National Science Foundation, in collaboration with the foundation's Engineering Research Center for Future Renewable Electric Energy Delivery and Management, which is based at NC State.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Cite This Page:

North Carolina State University. "New way to determine amount of charge remaining in battery." ScienceDaily. ScienceDaily, 9 October 2012. <www.sciencedaily.com/releases/2012/10/121009102157.htm>.
North Carolina State University. (2012, October 9). New way to determine amount of charge remaining in battery. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/2012/10/121009102157.htm
North Carolina State University. "New way to determine amount of charge remaining in battery." ScienceDaily. www.sciencedaily.com/releases/2012/10/121009102157.htm (accessed August 20, 2014).

Share This




More Matter & Energy News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Newsy (Aug. 19, 2014) Scientists have developed a new device that mimics the way octopuses blend in with their surroundings to hide from dangerous predators. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com
Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

AFP (Aug. 19, 2014) A solar cell that resembles a flower is offering a new take on green energy in Japan, where one scientist is searching for renewables that look good. Duration: 01:29 Video provided by AFP
Powered by NewsLook.com
Tiny Satellites, Like The One Tossed From ISS, On The Rise

Tiny Satellites, Like The One Tossed From ISS, On The Rise

Newsy (Aug. 18, 2014) The Chasqui I, hand-delivered into orbit by a Russian cosmonaut, is one of hundreds of small satellites set to go up in the next few years. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins