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Tesla Roadster facing 'brick' battery problems?

Sebastian Blanco — Wed, 22 Feb 2012 16:30:00 EST

Filed under: Convertible, Performance, Safety, Technology, Tesla, Electric

Here's a new worry for electric car owners: bricking your new, expensive ride.

Using a word taken from the computer world, to "brick" an EV means to make your electronic device inoperable. In the case of an EV, it would mean to run the battery state of charge so far down that nothing works anymore, thus requiring an expensive flatbed tow and an even more expensive battery pack - about $40,000 in a Tesla Roadster.

This is the charge of Michael Degusta, who wrote a detailed post on the matter in which he claims there have been five cases of Roadsters being bricked that he knows about. Since this is the first we've heard about it (and we imagine all those Silicon Valley Roadster owners know a thing or two about Internet communication), we're surprised we didn't hear about this before the alleged problem claimed five non-working cars. Thus, we figure there's more to the story, especially since some people are already poking holes in some of Degusta's statements. We've emailed Degusta and asked him to provide further proof of and details about these bricked cars, but he has not responded yet.

For its part, Tesla has offered AutoblogGreen a fairly noncommittal statement on the matter:

All automobiles require some level of owner care. For example, combustion vehicles require regular oil changes or the engine will be destroyed. Electric vehicles should be plugged in and charging when not in use for maximum performance. All batteries are subject to damage if the charge is kept at zero for long periods of time. However, Tesla avoids this problem in virtually all instances with numerous counter-measures. Tesla batteries can remain unplugged for weeks (even months), without reaching zero state of charge. Owners of Roadster 2.0 and all subsequent Tesla products can request that their vehicle alert Tesla if SOC falls to a low level. All Tesla vehicles emit various visual and audible warnings if the battery pack falls below 5 percent SOC. Tesla provides extensive maintenance recommendations as part of the customer experience.

It's also true that all vehicles will require some attention if they sit unused too long, and people know what happens if you leave your laptop unplugged for two weeks. In the owner's manual for the Roadster 2.0/Roadster Sport, Tesla does say that "Over-discharge can permanently damage the Battery" and that "If storing for more than 15 days, it is strongly recommended that you keep it plugged in" (see the full section on "Leaving the vehicle unplugged" after the jump, or download the manual in PDF here), but it doesn't specify what sort of damage that is, or how expensive it might be to fix it. Tesla spokesman Ricardo Reyes did tell AutoblogGreen that he is working to demystify the situation and will get back to us with more information.

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Tesla Roadster facing 'brick' battery problems? originally appeared on Autoblog on Wed, 22 Feb 2012 16:30:00 EST. Please see our terms for use of feeds.

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Report: Tesla says Model S will be profitable thanks to cheaper batteries

Sebastian Blanco — Sun, 02 Jan 2011 13:45:00 EST

Filed under: Sedan, Technology, Earnings/Financials, Tesla, Electric

Tesla Model S - Click above for high-res image gallery

It's not exactly a surprise that battery costs for electric vehicles will go down over time, but the big question is by how much and how fast. Tesla Motors, which uses small lithium-ion cells similar to the kind found in laptop computers, believes that lithium-ion pack costs will be low enough to make the $57,000 Model S profitable even though it'll likely sell in smaller numbers than all-electric competitors like the Nissan Leaf.

That's what Tesla's chief technology officer J.B. Straubel told Bloomberg, adding that Nissan has "a cost challenge that will be more difficult to solve. It will require a lot higher volume before they really get to a cost point that is internally sustainable." Nissan, of course, paints a different picture because it has been developing li-ion technology for almost two decades, but there you have it.

Nissan's annual sales target for the Leaf, once full production gets going, is in the hundred-thousands, while Tesla hopes to sell around 20,000 units of the Model S a year. The big difference is in the price per kilowatt hour (kWh). Tesla co-founder Martin Eberhard told Bloomberg recently that he thinks Tesla's battery packs might cost just $200 per kWH, while the large-format cells in the Leaf (and most other plug-in vehicles) could cost around $700 to $800 per kWh. Nissan has previously said the Leaf pack costs just under $750 per kWh.

[Source: Bloomberg]

Report: Tesla says Model S will be profitable thanks to cheaper batteries originally appeared on Autoblog on Sun, 02 Jan 2011 13:45:00 EST. Please see our terms for use of feeds.

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Report: Tesla CTO confirms building two mules for Toyota

Sam Abuelsamid — Sun, 11 Jul 2010 15:35:00 EST

Filed under: Toyota, Tesla, Electric

AutoblogGreen had the rare opportunity on Friday to chat with Toyota CEO and president Akio Toyoda. During the conversation, he revealed that a prototype vehicle with a Tesla electric drive unit was under construction. Tesla's Chief Technology Officer, J.B. Straubel, has confirmed this to CNN Money, saying that the Silicon Valley company is indeed preparing two mule vehicles for Toyota. Tesla battery packs, power electronics and motors are being installed into Toyota bodies.

Straubel expects to deliver the vehicles to Toyota by the end of of this month. Toyota officials told ABG that the initial plan is to just test the performance and durability of the Tesla packs to determine whether they meet Toyota standards. If Toyota proceeds with a production program using a Tesla-style battery (employing small laptop-type cells) it will be for a new vehicle, not the iQ-based EV arriving in 2012.

[Source: CNN Money]

Report: Tesla CTO confirms building two mules for Toyota originally appeared on Autoblog on Sun, 11 Jul 2010 15:35:00 EST. Please see our terms for use of feeds.

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Toyota already building EV prototype with Tesla battery pack?

Sam Abuelsamid — Fri, 09 Jul 2010 10:29:00 EST

Filed under: Hybrid, Japan, Technology, Toyota, Tesla, Electric

During a interview with a group of American media this afternoon in Nagoya, Japan, Toyota president Akio Toyoda revealed that his company is already in the process of building a prototype electric vehicle with a Tesla battery pack. The statement came in response to questions about the relationship between Toyota and Tesla. As time ran out, we did not have an opportunity for further follow-up or clarification.

However, both Toyoda and executive vice president Shinichi Sasaki both indicated that Toyota was interested in comparing Tesla's battery configuration against their own internally developed battery. Toyota has a joint-venture with Panasonic that is building larger format automotive batteries that are similar to those used by most other manufacturers. By comparison, Tesla uses commodity 18650-format cells that are typically found in laptop computers. The Roadster's pack contains 6,831 such cells.

The long-term durability of the Tesla approach is still very much in question as few Roadsters have accumulated high mileage especially in harsh conditions that more mainstream cars would experience. We may or may not ever see a Toyota car with a Tesla battery pack publicly, as it all depends on the results of this study.

Toyota already building EV prototype with Tesla battery pack? originally appeared on Autoblog on Fri, 09 Jul 2010 10:29:00 EST. Please see our terms for use of feeds.

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