Ford's confidence in lithium-ion is based on so-called Key Life Tests. The tests predict that the working capacity (y-axis) of lithium-ion batteries (green line) will be greater over a high-mileage lifetime (x-axis) than that of nickel-metal hydride (yellow line). Past field data for nickel-metal hydride (blue dots) has shown that the testing results are conservative -- that is, batteries generally do better in the field than they do on tests. (Source: Ford Motor Co.)
Charles--very informative. I don't know that much about batteries but, is "working performance" (y-axis) the same as cold-cranking amps? I am assuming that's the case. If so, I can see how HALT (highly accelerated Life Testing) under hot and cold conditions, could bring about the conclusions you mention. I do have some experience with running components using powertrain dynamometers and the results for the equipment we tested were basically the same as actual "road tests". Again, very good update.
Charles, do you happen to know if these batteries are standard in any way or are they built specifically for Ford? I know that they are suppose to last for pretty much the life of the car - at least the first owner, but it would interesting to see what happens after that.
I agree with Ford NiMH never was that good a battery and Lithiums have left it in the dustbin of history mostly because of it's more costly material and the fact that they need 3x's the cells because they are only 1.2vdc/cell.
On the post above supercaps won't ever be viable as they cost way, way too much for the pitiful capacity they have. Just do the numbers on them and it quickly become painfully clear.
Good point, Jerry. Definitely worth mentioning. It should also be noted, however, that Ford is using lithium-ion across the board, including in the second-gen Fusion hybrid and the C-Max Energi hybrid -- both of which use smaller batteries that would be unaffected by the Chevron 10Ah patent encumbrance. Ford told us they chose lithium-ion because it's "smaller, lighter weight and (has) better re-charging capability." And (this is what the article was all about) their testing capabilities gave Ford engineers confidence that lithium-ion would be more durable than NiMH.
The latest Mazda 6 uses a supercapacitor system, called i-ELOOP.
"When a car equipped with i-ELOOP is decelerating, a variable-voltage alternator (12 to 25 volts) pumps electricity into an electric double-layer capacitor (also known as a supercapacitor). When the car comes to a stop, Mazda's engine stop-start system—branded i-stop—takes over and shuts the engine off. At this point, all auxiliary vehicle functions (radio, HVAC, headlights, etc.,) are powered by the supercapacitor; its 25-volt output is stepped down to 12 volts by a DC/DC converter. There are times that the supercapacitor will recharge the 12-volt battery, too."
It's amazing no one bother to mention the small fact that Chevron who owns the NiMH patents won't let anyone build them over 10amphr and they do not play well together in parallel so no one can build EV's with them.
So in reality Ford, others if they want any kind of range have to go to Lithium batts. Now add Lithium actaully costs less than NiMh batts do mow plus NiMH uses Rare earth's that China is restricting exports on puts the nail in the coffin for them.
But the Chevron NiMH patent runs out soon but won't matter as Lithium has so surpassed them in every way from capacity, weight, impulse power and range.
And to the poster who thought Li materials are rare and short supply is completely wrong as cars already use the same materials except possibly Lithium which is not expensive or rare, in fact quite abundant.
My bet is that the Ford engineers know more than they are telling. In the past few years I have observed that company to be doing a whole lot of really intense research in a variety of areas. So without giving away any of their secrets, I can offer that they do know what they are doing, but you will not get them to explain it. The rest of their secrets will need to come from their internal publicity group, I said all that I can disclose.
I fear resources needed to create the Li-on batteries will start to become scarce, as more and more devices use them. Start manufacturing 700 pound versions of them will only hasten the demise. I would like to see Ford and Toyota look into alternative battery types, or even supercapacitors. I think supercaps will end up powering our devices in the near future, not sure about cars though. Caps can charge fully in a few minutes as opposed to hours.
Not to go overboard in the use of industry jargon, but the technical description of that scenario is that "the customer is screwed."
On the plus side, aftermarket companies will in all likelihood jump in and offer conversion packages to enable owners to replace their old battery packs with the better technology. It's like converting an old pre-'80s car with a breaker-points ignition system to capacitive discharge (electronic) ignition.
What is somewhat troubling to me is that we've been hearing for years that replacement costs for NiMH batteries would come down, drastically, but is that statement accurate if that type of battery is obsolete?
We can buy 12V lead acid batteries, anywhere because they are still being used. However, if cost is based upon high production numbers, what happens when those numbers drop, years after a "better" type of battery is invented/tested/approved?
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