TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

I cannot believe no-one has yet managed to come up with a figure for the mass of a single 2170 cell.

Discussion in 'Battery Discussion' started by JKolodziejski, Jun 12, 2018.

  1. JKolodziejski

    JKolodziejski Member

    Joined:
    Nov 18, 2017
    Messages:
    36
    Location:
    United Kingdom
    #1 JKolodziejski, Jun 12, 2018
    Last edited: Jun 12, 2018
    After furtively searching for it, all across the EV news sites and all the breakdowns so far, despite the very cells obviously being physically separable and in the hands of people analysing the battery pack (Mmmmmph! Hmmm! THIS picture), nobody has seemingly bothered to measure the cell mass itself.

    And, no, the battery pack specific energy density alone isn't good enough and volumetric battery pack energy density means even less.

    Reason I am asking this is because the battery pack mass is variable and does not actually give an indication of the underlying technology.

    it's really quite important if one wants to compare to what LG are doing, and if Elon was stretching it when he says "so and so improvement"

    The cells are known to have circa 18.23 Wh - that's 80.5 kWh divided by 4416 cells.

    Depending on whether this cell is 60 to 75 grams determines specific energies that are surprisingly variable, from 243 Wh/kg to 304 Wh/kg

    It's really irritating. Is there some weird NDA thing going on? Can someone cough up for once?
     
  2. GregRF

    GregRF Squirrel Power

    Joined:
    Jul 22, 2014
    Messages:
    311
    Location:
    CA
    From the EVTV teardown we learned that the difference between the two modules is 16lbs (207lb for 25s vs 191lb 23s). So if each series group has 46 cells (4416/96s) in parallel that would make 92 cells that weigh 16lbs, so roughly 79 grams per cell.

    Not sure what else is different between the two module types, but my guess would be that would be the upper bound of cell weight.
     
    • Helpful x 1
    • Informative x 1
  3. JKolodziejski

    JKolodziejski Member

    Joined:
    Nov 18, 2017
    Messages:
    36
    Location:
    United Kingdom
    Good find but the modules themselves are different lengths. The ones with more cells have more structure and vice versa, however the 79 grams figure does give an upper bound.
     
  4. Electroman

    Electroman Active Member

    Joined:
    Aug 18, 2012
    Messages:
    4,581
    Location:
    TX
    with 18.23 Wh/cell and one cell is 79 grams (upper bound) --> that comes to 230 Wh/Kg (Lower bound).

    Most likely around 250 Wh/Kg. Okay but not great.
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC