I just found this news item: http://www.streetinsider.com/Analyst+Comments/Tesla+(TSLA)+to+Develop+Hybrid+Battery+Packs+that+Could+Increase+Range+40%25+-+Analyst/8689599.html
Does anybody know anything more about this and the technology behind it?
Maybe this link works better: http://goo.gl/E78kyT
And here are the links to the two patents mentioned: http://www.google.com/patents/US20130181511 http://www.google.com/patents/US20130187591
In another thread (I can't find it!) several months ago there was discussion of battery pack design for increased range. Since various lithium batteries provide different types of performance, I suggested that a hybrid arrangement would be a way to increase range without technological break through.
Lithium-ion batteries are slow to charge but fast in their discharge, providing quickly available energy for acceleration, starts and stops, etc. Other Lithium batteries (there are a number of designs) are quick to charge but slow to discharge, making energy available more slowly. These other lithium based batteries would be ideal for maintaining steady driving after accelerating to a desired speed, eg cruise control.
The current management systems of hybrid cars would seem to be an ideal method for switching between the two battery packs for optimal energy use and extended range. The Tesla battery swap system would be ideal for upgrading existing Model S battery packs. The Model E and the 'new' Model S coming in 2-3 years could be outfitted during production. There would be no need to change the converter/motor arrangement.
From the very beginning, Elon has observed that the battery pack was designed for easy upgrade . . . and for use of whatever new energy source that might come along.
i'm glad to hear Tesla is leading the pack with new battery technology will make future car batteries more powerful, lighter and more compact, and hopefully also more affordable before our warranty expires... but will Tesla price the new batteries to encourage existing customers to buy a new replacement battery or buy a new Tesla?
The hybrid battery idea is not exactly new, but I hope tesla can perfect it:
"Small lithium-ion packs could provide short power bursts for city driving and acceleration from low speeds, while lower-cost, higher-density zinc-air batteries would furnish the power for long-distance cruising, giving EVs the range they now lack at a more affordable price."
A really interesting article, thanks Pacey.
To be more precise, a hybrid battery pack has been patented by Tesla. Tesla patents many ideas that don't necessarily make it to the production floor, just like most companies do.
Sounds like what many were thinking would be the "Surprise" a few months ago, a metal-air booster in the "microwave" frunk spot. But TM shot that down: no wiring and cooling was not workable.
Most such patents are never implemented, and may be anti-competitive moves. Hard to say.
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