Automotive | All About Automotive

Darryl Siry blogs over at Wired's Autopia. He's pretty plugged in, having worked at Tesla and consulted for CODA. He's a bit surprised, as are all of us, that Nissan has emerged as the first big automaker to manufacture a mass-produced electric car.

In his recent post, "In Race to Market, Nissan’s Electric Car Takes Shortcuts," Siry makes the point that CEO Carlos Ghosn's enthusiasm and charisma alone couldn't be enough to get such a job done so quickly. He writes that the urgency of the project "appears to have driven the company to take some shortcuts."

Sounds ominous. Ultimately, I'm not sure what he's actually getting at. Because Siry makes only two points. Neither of certain significance.

First, he suggests Nissan overstates the range of the LEAF. The 100 mile range cited by Nissan uses "a number tied to the most optimistic benchmark, the LA4 cycle." I don't doubt that this is true. The LEAF pack has fewer kWh than my RAV4 EV, but could be almost as heavy. Until we get final specs on weight, and drive the car around a bit, we won't know to what extent people will need to handicap official range numbers as they do EPA gasoline mileage ratings. Big surprise, your actual mileage may vary. Buyer beware!

Second, and the point on which the article devotes most attention, is whether Nissan is "cutting corners" by forgoing an active thermal management (HVAC) system for the batteries. Instead Nissan is relying on air circulation with a fan.

Now I don't know whether something about lithium, regardless of chemistry or packaging, will prove to require an active system. But I do know, interestingly and perhaps relevantly, that the electric car that has probably driven more miles than any other model, the Toyota RAV4 EV, does not have batteries with an active system. A fan circulates air. The Honda EV+ used the same Panasonic EV-95 NiMH battery modules with an active system, and those packs didn't last as long. Many EV+ packs were exchanged during their brief time on the road. At least with NiMH, Toyota's passive system worked out better in the real world. Of course the cooling system may have had nothing to do with the the difference in performance of the same batteries in two Japanese EVs, but we'll never know.

Siry notes the different approach being taken by GM for the Volt. They reverted to the T-shaped tunnel configuration for the battery used in the EV1. (How did that work out?)

I may be approaching this too simply, but the tunnel has never made sense to me. It eliminates the possibility of a fifth passenger seat. And I find it makes me feel confined. The batteries, too, enshrouded on three sides, require, apparently, an active thermal management system.

The RAV, on the other hand, suspends the batteries below the vehicle. There is minimal loss in cabin space and a large surface below helping dissipate heat, which is an issue with NiMH, too. And we find that the LEAF's battery pack, too, will be located under the floorboard. Maybe that's the key. Keep the batteries low and spread them wide.

I don't know, of course, but I'm willing to give Nissan the benefit of the doubt.

I'm giving Tesla and CODA and GM the benefit of the doubt, too.

BMW has recognized that they simply teed up GM and Nissan to benefit from the MINI E experience. Today they announced officially that MINI E "pioneers" will be able to extend their leases until 2011. At that point the ActiveE, an electric Series 1 Beemer, is projected to be available, however only as yet another "electric vehicle test program," as they put it in their wordy press release. Will MINI E drivers be so loyal to BMW they'll forgo the opportunity to actually purchase a plug-in car?

Over at GM, Bob Lutz says an all-electric Volt would be "technologically trivial." No word on when.

Toyota titillates with its plug-in Prius test program (600 vehicles worldwide over the next few years) as well as an all-electric 50-mile range "small, urban commuter BEV" and a plug-in hybrid concept small car. But they still want us to believe that their fuel cell vehicles will hit showrooms in 2015. This despite the fact that they project placing in service a mere 100 or so such cars over the next three years.

And Toyota's press release continues their "blame the consumer" rewrite of history regarding the RAV4 EV (about 800 of which, including mine, remain on the road.)

The RAV4 EV and e-com programs were short lived due to lack of commitment from the market; the consumer and the consumer's environmental mind set were not ready to commit to battery electric vehicles at that time.