View Comments: Newest First|Oldest First|Threaded View
<<  <  Page 2/2
Charles Murray
User Rank
Re: Interesting Points
Charles Murray   8/19/2011 1:16:44 PM
Beth: Rolls-Royce seemed more interested in making sure the battery fit in the existing engine bay, so they wouldn't have to re-design the vehicle. Their use of a 240 Wh/kg battery is key there. With a lower energy density (140 Wh/kg is more typical today), the battery would hav been much bigger and heavier.

Beth Stackpole
User Rank
Re: Interesting Points
Beth Stackpole   8/19/2011 1:10:36 PM
I find the point that the battery for the Phantom could cost between $35,000 and $70,000 mind boggling. Just goes to show you what luxury can afford. Any sense of what kind of special considerations Rolls Royce's performance and quiet requirements have in terms of EV development?

Charles Murray
User Rank
Re: Interesting Points
Charles Murray   8/19/2011 12:41:45 PM
Ivan: Most automakers (Rolls-Royce included) don't want to talk about the price of electric car batteries, so this is a very slippery subject. Often, you'll hear estimates of about $500 to $600/kWh but these are typically given without including the price of the cooling and electronic control system. The National Academy of Engineering estimated that total EV battery cost is more than $1,000/kWh. Toyota said the same in 2010. Tesla and Nissan have said their cost is $500/kWh, but, again, this is believed to be the price for the cells, not the entire system. I talked to Pike Research this morning, and they said they are inclined to believe that EV batteries typically cost $800 - $1,000/kWh. To be fair, I think it's best to give a price for the entire system, since cooling is an absolute requirement for lithium-ion battery chemistries. If you really want to pin it down, I think Pike's number is as good as you'll get.

Ivan Kirkpatrick
User Rank
Interesting Points
Ivan Kirkpatrick   8/19/2011 12:24:06 PM
There are a couple of interesting points and facts in this article.  The 120 mile range is better than most other cars.  The "range anxiety" issue remains though even if the driver does not need it or expect to use it.  

The battery pack is indeed large, heavy and expensive.  5 modules, at 1400 lbs is a big piece of the weight margin for the car.  The cost per KwH is stated as $500 to $1K.  I would like to see this pinned down a bit more.  

The battery chemistry is stated to be Lithium-nickel-cobalt-manganese etc.....  so one would think the advances in lithium chemistry are finding their way into new designs.

Th limitations still appear to center around the battery packs' energy density and cost.  It would seem that a doubling of the energy density and reducing the cost by half or better is going to be necessary to make the design truly useful and get it into the mainstream.  

<<  <  Page 2/2

Partner Zone
Latest Analysis
Design News previews some of the solutions exhibitors that will be at the huge UBM-organized design, engineering, and manufacturing trade show in Anaheim in February 2016.
The common denominator in just about every electromechanical system is the use of a motor. If sensors will be the eyes and ears of the IoT, motors will be the arms and legs.
The IRB 8700 is aimed at material-handling applications in the automotive, transportation, and other heavy industries.
Governmental policies and mandates in Europe are leading the way in creating low-carbon manufacturing.
Digital healthcare devices and wearable electronic products need to be thoroughly tested, lest they live short, ignominious lives, an expert will tell attendees at UBM’s upcoming Designers of Things conference in San Jose, Calif.
Design News Webinar Series
11/10/2015 11:00 a.m. California / 2:00 p.m. New York
10/29/2015 11:00 a.m. California / 2:00 p.m. New York
10/20/2015 8:00 a.m. California / 11:00 a.m. New York
12/2/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 6 - 10, Building Raspberry Pi Controllers with Python
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7

Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service