Wax may make electric cars a reality.
Position | Automotives - Battery heat control - Brief Article |
With more than 250,000,000 polluting cars on the road, fuel prices soaring, and global warming concerns, the idea of a zero-emissions battery-powered car is certainly desirable. Hybrid cars that use both batteries and gas are available commercially, but there are currently no cars that rely solely on batteries. One of the reasons is that the large lithium-ion batteries that would be used to power electric cars generate intense heat. Found in cell phones and laptop computers, lithium-ion batteries pack a lot of power into a very small battery. Their high-energy density makes them susceptible to fire and may pose serious safety concerns. Hybrid carmakers solve this by fitting car battery cases with fans that blow excess heat away. However, fans are complex and expensive, and, if they fail, they could have a major meltdown. Researchers at the Illinois Institute of Technology, Chicago, are working on a low-tech solution to this high-tech dilemma--wax.
"When lithium-ion batteries are scaled up to the size needed to run a car, the heat they give off is very significant," notes Said Al-Hallaj, associate research professor of chemical and environmental engineering. "So much energy is released when the batteries are turned on that it becomes essential to remove this heat to keep the battery operating safe." Conventional car batteries contain water-based electrolytes, which can't burn. Lithium-ion batteries contain organic...
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