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Short-Term TSLA Price Movements - 2016

Discussion in 'TSLA Investor Discussions' started by AudubonB, Dec 31, 2015.

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  1. vgrinshpun

    vgrinshpun Supporting Member

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    Both Elon and JB not only confirmed that the PW1 10 kWh cells are NCA, but also mentioned that they were very close to the TA cells.
     
  2. Yggdrasill

    Yggdrasill Active Member

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    #44022 Yggdrasill, Nov 7, 2016
    Last edited: Nov 7, 2016
    I'm not so sure the amount of cells is unchanged. The new PW2 battery pack seems to be roughly 700 x 700 mm. With ideal cell packing, 90.69% of the 490,000 mm^2 area will be filled by the area of the cells.

    A 21-70 cell has an area of 346 mm^2, so that means the absolute maximum number of cells is 1284. This means that every cell is touching six other cells. If we assume there's a 2 mm gap between each cell, each cell occupies 491 mm, and the maximum number of cells is 905.

    The previous powerwall had 888 cells. So, okay, it's plausible, given a pretty ideal arrangement of cells.

    Looking at the active material, the 21-70s should have roughly 1 - (69 x pi x 10^2) / (64 x pi x 8.5^2) = 49.3% more active material per cell than the 18650s. So, if the number of cells was identical, we would expect an improvement of around 49.3%, with no improvement due to chemistry.

    And we also know the P100D is using the new pack architecture. Here, the improvement was something like 1 - 100 / 85 = 17.7%. If we assume the improvement due to length comes on top of this, the total improvement due to the pack architecture and cell format should be 1 - (100 / 85) x (69 / 64) = 26.9%
     
  3. Yggdrasill

    Yggdrasill Active Member

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    #44023 Yggdrasill, Nov 8, 2016
    Last edited: Nov 8, 2016
    I was posting early in the morning and I was in a rush, so the above post wasn't quite finished. I edited it a bit to correct some errors. I think I am pretty much in agreement with vgrinshpun, there really should be a substantial improvement in chemistry involved.

    I think there must be an increase in the number of cells, and with this amount of cells, really the only way to do cooling is immersion cooling, where you fill the entire pack with a liquid that you circulate and actively cool. The question is, how many cells are we talking about? I think the possible range is 888-1284 cells.

    With 888 cells, the improvement in chemistry should be 1 - (13.5/6.4) / ((888/888) x 1.493) = 41.3%.

    With 1284 cells, the improvement in chemistry should be 1 - (13.5/6.4) / ((1284/888) x 1.493) = -2.3%

    Maybe the highest cell-density scenario that has any realism is 1 mm spacing between the cells. This allows for at least some coolant flow between the cells, and the cells shouldn't touch if the pack is flexed. With this spacing, each cell takes up 380.1 mm^2, and you can stuff in 1169 cells. The closest logical architecture being 12s97p, or 1164 cells.

    With 1164 cells, the improvement in chemistry should be 1 - (13.5/6.4) / ((1164/888) x 1.493) = 7.8%

    Okay, so my guess is a chemistry improvement in the 7.8-41.3% area.
     
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  4. RobStark

    RobStark Well-Known Member

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  5. Yggdrasill

    Yggdrasill Active Member

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    You can also look at the weight. Assuming each cell weighs 75 grams, 1164 cells would weigh 87.3 kg. The cell weight for a Powerpack would be 1394 kg. That's a pretty substantial chunk out of the 1622 kg official weight.

    One additional thing that can be easily estimated is the amount of coolant. With 1164 cells, it would be 6 liters per pod, maybe 7 liters including reservoir. That would add at least 100 kg to a Powerpack.

    So, cells and coolant would leave around 130 kg for everything else. I think that's implausible, to say the least. This indicates that the improvement in chemistry is likely substantially greater than 7.8%.
     
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  6. vgrinshpun

    vgrinshpun Supporting Member

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    The kicker is that new cooling architecture does not include any coolant flow channels between the cells.
     
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  7. vgrinshpun

    vgrinshpun Supporting Member

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    The new battery pack cooling is not immersion.
     
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  8. vgrinshpun

    vgrinshpun Supporting Member

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    Did you account for space inside the pod that is filled with BMS, protection and switching equipment? I have to dig out pictures of the inside of the pod.
     
  9. Runarbt

    Runarbt Member

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    Do technical discussion of PW and PK really affect short term SP?
     
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  10. mutle

    mutle Member

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  11. Yggdrasill

    Yggdrasill Active Member

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    #44031 Yggdrasill, Nov 8, 2016
    Last edited: Nov 8, 2016
    What do you base that on?

    It is possible that they have gone with something else, but I think it's the simplest solution. It allows for a relatively simple design with high energy density that's easy to manufacture. You also have very good cooling properties, and with a non-flammable coolant it could be quite fire-resistant. It also fits without assuming huge improvements in chemistry. At my top end estimate of 41% improvement in chemistry, the NMC chemistry would be at only a slight disadvantage to the NCA chemistry. Yet even with that amount of improvement in chemistry, the cells are packed so tight that non-immersion cooling will be very difficult.
     
  12. Yggdrasill

    Yggdrasill Active Member

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    It can.

    If 40% improvement in chemistry is real, that means Tesla/Panasonic has a *huge* technological lead. It means that the competition isn't even in the same ballpark.
     
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  13. Jonathan Hewitt

    Jonathan Hewitt Active Member

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  14. Ovulation

    Ovulation Member

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    techcrunch.com (again) with some interesting insides

    Tesla acquires Grohmann engineering to boost production

    We thought it was important that Tesla become, in part, a German company,” Musk said, regarding the investment in the country. “That’s what this was all about.”

    Tesla CTO JB Straubel explained that Tesla has been working with Grohmann in a partnership for the past few months, and found that the teams complemented each other well and were achieving a lot in terms of automation improvements, and determined they could do even more as a combined company.
     
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  15. vgrinshpun

    vgrinshpun Supporting Member

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    #44035 vgrinshpun, Nov 8, 2016
    Last edited: Nov 8, 2016
    My research of publically available information, which I was planning to share for a while, but did not get to it. It is nearly certain that they've done "something else".
     
  16. NOLA_Mike

    NOLA_Mike Grouchy

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  17. Ovulation

    Ovulation Member

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    Address

    Grohmann Engineering GmbH
    Rudolf-Diesel-Street 14, 54595 Prüm

    :D:D:D:D
     
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  18. Yggdrasill

    Yggdrasill Active Member

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    When you get around to it, we can discuss it further.

    I agree. Fair value is maybe something like 250 million USD?

    I'm thinking it shouldn't have a huge impact on finances, and may also be counted into the planned Model 3 capex.
     
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  19. vgrinshpun

    vgrinshpun Supporting Member

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    It also demonstrates that belief held by many that competition is about to close in while plausible in general terms (and that's how discussions on this topic are always framed), upon closer examination of specifics just does not add up. It is not to say that market valuation can't be based on incorrect perception that competition is about to crash the party, but it is totally different argument than saying that competition has realistic chance to catch up knowing what we know now and the history of more than a decade.
     
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  20. kelevra

    kelevra Member

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    does anyone know a way to access "the call discussing the news" mentioned in the techcrunch article, or is this impossible?
     
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