EVPlus - December 2014
If you find a news item relevant to EVs, Hybrids & battery
technology etc, please submit it via the
Tesla Roadster 3.0 adds 70 kWh Battery
and 640 km Range
Added by admin 26/12/14
Motors have announced a new extended-range upgrade for the
Roadster - the Lotus-based two-door
that preceded the Model S sedan.
The upgrade includes a battery swap, a retrofit aerodynamics kit
to reduce drag by 15% plus new tires and wheel bearings to
decrease rolling resistance by 20%. The upgrades are expected to
yield a 40 to 50 percent improvement in range, breaking the
Battery technology has continued a steady improvement in recent
years, as has Tesla's experience in optimizing total vehicle
efficiency through Model S development. Tesla have long been
excited to apply this learning back to their first vehicle, and
aim to do just that with the prototype Roadster 3.0 package. It
consists of three main improvement areas.
The original Roadster battery was the very first lithium ion
battery put into production in any vehicle. It was state of the
art in 2008, but cell technology has improved substantially since
then. Tesla have identified a new cell that has 31% more energy
than the original Roadster cell. Using this new cell they have
created a battery pack that delivers roughly 70 kWh in the same
package as the original battery.
The original Roadster had a drag coefficient (Cd) of 0.36. Using
modern computational methods Tesla engineers 'expect' to make a
15% improvement, dropping the total Cd down to 0.31 with a
retrofit aero kit.
3. Rolling Resistance
The original Roadster tires have a rolling resistance coefficient
(Crr) of 11.0 kg/ton. New tires for the Roadster 3.0 have a Crr
of roughly 8.9 kg/ton, about a 20% improvement. They are also
making improvements in the wheel bearings and residual brake drag
that further reduce overall rolling resistance of the car.
Combining all of these improvements Tesla 'expect to achieve a
predicted 40-50% improvement on range between the original
Roadster and Roadster 3.0. There is a set of speeds and driving
conditions where we can confidently drive the Roadster 3.0 over
400 miles (640 km). Tesla will be demonstrating this in the real
world during a non-stop drive from San Francisco to Los Angeles
in the early weeks of 2015.
Appointments for upgrading Roadsters will be taken this spring
once the new battery pack finishes safety validation. Tesla are
confident that this will not be the last update the Roadster will
receive in the many years to come.
Story and image courtesy:
Electric Vehicle News
VW buys stake in solid-state battery
startup aiming to triple EV range
Added by admin 06/12/14
bought a stake in battery startup QuantumScape with the aim of
developing technology that can more than triple the range of its
electric cars, according to people familiar with the matter.
VW is considering using the energy-storage technology, which is
fireproof, for vehicles from the namesake brand as well as
Porsche and Audi, said the people, who asked not to be identified
because the plans are private. Tests to show the system is viable
for cars are due to be completed in mid-2015, they said. The VW
of America unit bought a 5 percent holding and has options to
raise the stake.
Peter Thul, a spokesman at Wolfsburg, Germany-based VW, declined
to comment on any investment. Calls to the main switchboard and
an e-mail to San Jose-based QuantumScape seeking comment weren’t
answered. Financial details of the company weren’t available.
QuantumScape is an early-stage battery startup that has been
working on commercializing technology from Stanford University.
It was was founded and is being led by Infinera co-founder and
CEO Jagdeep Singh, and is backed by Kleiner Perkins Caufield &
Byers and Khosla Ventures.
Licensing technology from Stanford, the company has been looking
to create batteries that are energy dense as well as safer than
standard lithium ion batteries. The company’s technology uses a
new method for stacking trace amounts of materials together,
which can lead to high energy and power densities, and also
higher cycle life than traditional lithium ion batteries.
The Department of Energy’s ARPA-E program awarded grant funding
to the stealthy firm back in 2011 describing the technology as:
This novel battery stores energy by moving electrons, rather than
ions, and uses electron/hole redox instead of capacitive
polarization of a double-layer. This technology uses a novel
architecture that has potential for very high energy density
because it decouples the two functions of capacitors: charge
separation and breakdown strength. If successful, this project
will develop a completely new paradigm in energy storage for
electric vehicles that could revolutionize the electric vehicle
700 km range
“I see great potential in this new technology, possibly boosting
the range to as much as 700 kilometers (430 miles),” VW Chief
Executive Officer Martin Winterkorn said in a Nov. 6 speech at
Stanford University in California. That’s more than three times
the range of the battery-powered version of the VW Golf. Tesla’s
Model S has a range of 265 miles, according to its website.
Electric Car technology is critical for meeting tightening
emissions regulations, especially for luxury-car manufacturers
such as VW, BMW and Mercedes-Benz. Volkswagen’s increased focus
on electric cars would put pressure on Tesla to maintain its
The German automaker employs about 44,000 research and
development engineers and spends $13 billion a year on new
technology. Tesla’s entire workforce totaled about 5,800
employees at the end of 2013, and research and development
expenses were $280 million in the first nine months of 2014.
“Electro-chemistry is a field of the greatest importance
internationally and across industries,” and is “a field where we
can and must achieve progress,” Winterkorn said in the speech. In
July, he said the company had invested in a battery-technology
company without providing details.
Story and image courtesy:
Electric Vehicle News