The 22700 format would replace the popular 18650 format.
The 22700 would be 22mm diameter and 70.0mm long witch mean that these new cells would be larger ddiameter but similar lenght.
We know that the smaller teh cylindrical cell are the more you can stack in the same volume.. so increasing their diameter appear to me to be a strange desicion... I need more details about that...
Source: http://thepresslist.com.au/technology/t ... ctric-car/Now, Musk says he will cut costs further by building a “gigafactory,” a gigantic plant that will at once double the global production of lithium-ion batteries. That scale, he reckons, will shave another 30% off the cost per kWh. He also plans to add one-third more energy volume per battery by using larger cylindricals, known as 22700s, according to Navigant. Thus, Musk expects his battery costs to drop to $175 per kWh by 2017, making that same 60 kWh battery $10,500. But that cuts just $4,500 off the cost of the Model S; he needs another $30,000 or so.