View Profile: Yggdrasill - Tesla Motors Club

05-17-2013, 03:24 AM

Yggdrasill replied to a thread Swapping is Coming [Discuss how it will be accomplished] in Model S: Battery & Charging

I also think we are talking about swapping the main battery pack, but I just don't see the market for swapping regular NCA li-ion battery packs. That...

128 replies | 7615 view(s)

05-16-2013, 12:11 AM

Yggdrasill replied to a thread Swapping is Coming [Discuss how it will be accomplished] in Model S: Battery & Charging

True. It doesn't exclude the possibility of Tesla going to Phinergy (or someone) and licencing their technology, however. The potential frunk...

128 replies | 7615 view(s)

05-13-2013, 06:38 AM

Yggdrasill replied to a thread Proof of Tesla's plan for battery swapping in Model S: Battery & Charging

Well, like I was saying in the similar thread in the "Tesla Motors" subforum, I am not entirely dismissive of aluminium-air batteries in the Model S....

167 replies | 12411 view(s)

05-13-2013, 04:01 AM

Yggdrasill replied to a thread Proof of Tesla's plan for battery swapping in Model S: Battery & Charging

I calculated using the figure 2 kWh/kg on the battery pack level. Here's one study saying the current batteries achieve 1300 Wh/kg and future...

167 replies | 12411 view(s)

05-13-2013, 03:45 AM

Yggdrasill replied to a thread Proof of Tesla's plan for battery swapping in Model S: Battery & Charging

The aluminium itself has around 8 kWh/kg, but the aluminium is only one part of the battery, you also need water, all sorts of electronics,...

167 replies | 12411 view(s)

05-13-2013, 02:44 AM

Yggdrasill replied to a thread Proof of Tesla's plan for battery swapping in Model S: Battery & Charging

Using the frunk is mostly unworkable, though, it can't hold enough weight and volume. Aluminium-air has an energy density of 2 kWh/kg at best, and...

167 replies | 12411 view(s)

05-13-2013, 12:01 AM

Yggdrasill replied to a thread What is Tesla's upcoming 'under your nose' announcement? in Tesla Motors

It is of course possible to swap a battery in 1 minute, just as it is possible to refuel a car in 1 minute, but it just isn't going to happen. For...

583 replies | 57925 view(s)

05-12-2013, 01:42 PM

Yggdrasill replied to a thread What is Tesla's upcoming 'under your nose' announcement? in Tesla Motors

There are of course other battery chemistries. Lithium Tritanate SCiB allows for charging at 8C, or 90% in 10 minutes. The energy density is the...

583 replies | 57925 view(s)

05-12-2013, 03:21 AM

Yggdrasill replied to a thread What is Tesla's upcoming 'under your nose' announcement? in Tesla Motors

That's what I suggested here. Assuming a little over 1 kWh/kg, the Model S battery pack could be replaced by an aluminium-air battery pack with...

583 replies | 57925 view(s)

05-09-2013, 11:31 PM

Yggdrasill replied to a thread What is Tesla's upcoming 'under your nose' announcement? in Tesla Motors

The numbers are not correct. 1300 Wh/kg includes all the bits you don't replace, and the water. The aluminium itself has around 8 kWh/kg, so by...

583 replies | 57925 view(s)

05-03-2013, 02:55 AM

Yggdrasill started a thread April 2013 EV Sales in Electric Vehicles

Sales for Norway: Electric car sales: Car brand/model: April: March: February: January:

1 replies | 285 view(s)

04-28-2013, 01:06 AM

Yggdrasill replied to a thread March 2013 EV Sales in Electric Vehicles

I think it's unlikely that very many of them will end up in Norway, for several reasons: - The used electric car market here isn't screaming out...

20 replies | 1316 view(s)

04-22-2013, 06:56 AM

Yggdrasill replied to a thread Tesla head on collision with a Honda in Model S

I was talking about head-on collisions. Of course the time it takes for the energy to be expended is very important, but this time will be...

435 replies | 97932 view(s)

04-22-2013, 04:48 AM

Yggdrasill replied to a thread Tesla head on collision with a Honda in Model S

The reason why it fares batter is not just that it is heavier. If the extra weight was manifested in a block of lead behind the drivers seat, the...

435 replies | 97932 view(s)

04-22-2013, 02:52 AM

Yggdrasill replied to a thread Tesla head on collision with a Honda in Model S

If the masses of the cars aren't the same, definitely. If you assume you have a 1 ton vehicle and a 2 ton vehicle, the difference would be: 2 ton...

435 replies | 97932 view(s)

04-21-2013, 05:28 AM

Yggdrasill replied to a thread Tesla head on collision with a Honda in Model S

We should use the earth as our frame of reference because we are the ones doing the observing, and we live on earth. If you view the situation as...

435 replies | 97932 view(s)

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