EIG is providing a high performance battery to Tata motors for a future plug-in vehicle. For the second time in as many months, I’m reviewing a battery that beats the competition in energy storage and power delivery.
The Tata EV is scheduled for Europe in 2010 or 2011. But the battery performance is what I’m interested in – just like the Panasonic battery from last month, this battery has outstanding energy storage and power delivery characteristics. These are Nickel-Cobalt-Manganese li-ion cells, and the one mentioned is their largest capacity prismatic cell, rated at 3.65V/20Ah (73Wh).
The specification sheet is here (warning: one big image), and the specifications are impressive. 175Wh/kg means that you can put together a 25kWh pack at only 143kg. Adding 20% of that weight for cables, electronics, packaging and safety you’ll get a final pack weight of 171kg, and an approximate volume of 81L. These figures aren’t far off from what is estimated for the Volt, but with a 50% larger gross storage capacity and a much larger net storage capacity. A Volt-spec battery pack, being constrained on volume and power, weights 69kg, produces 130kW at maximum discharge, stores its 8kWh usable in 12kWh (75% DoD), and should last between 1500- 6000 cycles (this range is so large because while the data sheet says 1000 cycles to 80% at 100% D0D, the chart below that shows 1000 cycles to 95%, plus the 50% cycle count boost by using only 75% DoD).
I’ve asked myself if we’re headed towards a leap in technology. Even after factoring packaging weight, the batteries still exceed the rumored pack figures for the upcoming battery packs (Volt, Leaf), factoring in three years for mass manufacturing,is this the leading edge for 2012-2015? The performance aspects about double what is rumored to be in existing EVs in the early part of the decade, and could provide for a new wave of larger, heavier EVs (small SUV or Crossover) that can be driven for 50-100 miles (EREV or BEV) that are more in line with whats popular in terms of car size.
[via Green Car Congress]
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- Japanese group announces 10,000 cycle capacitors
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- MIT Powerpoint on electric cars
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