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Thread: Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

  1. #1

    Default Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

    I'm guessing it is still a NCA cell. Does anyone know the technical reasons they went with a new size?



    Mike

  2. #2

    Default Re: Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

    Quote Originally Posted by Arizona_Mike View Post
    I'm guessing it is still a NCA cell. Does anyone know the technical reasons they went with a new size?



    Mike
    There have been a few threads about these batteries including early mention of 20700 instead. I think the reason for the size change vs 18650 is increased capacity per cell along with higher current capability they probably did the math and used formulas with dimensions and power capacity. The one thing that is somewhat true is the larger the individual cell the less of them needed (quantity) and most likely the cost per cell is larger than the cost per volume change.
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  3. #3

    Default Re: Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

    Knock-offs already are available on certain websites

  4. #4
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    Default Re: Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

    Quote Originally Posted by Lynx_Arc View Post
    There have been a few threads about these batteries including early mention of 20700 instead. I think the reason for the size change vs 18650 is increased capacity per cell along with higher current capability they probably did the math and used formulas with dimensions and power capacity. The one thing that is somewhat true is the larger the individual cell the less of them needed (quantity) and most likely the cost per cell is larger than the cost per volume change.
    Another advantage of larger cells is that the ratio of the volume of the can to the volume of active material decreases as cell size increases. So a greater proportion of the volume of each cell actually contributes to energy storage as cells get bigger. Also, fewer cells to manage means a less complex (and, therefore cheaper) battery management system.

  5. #5
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    Default Re: Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

    7 pages of info and links here:

    http://www.candlepowerforums.com/vb/...-per-Elon-Musk

    There have been speculations in print about the battery capacity and max current, but nothing official from Tesla.

  6. #6

    Default Re: Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

    Quote Originally Posted by SubLGT View Post
    7 pages of info and links here:

    http://www.candlepowerforums.com/vb/...-per-Elon-Musk

    There have been speculations in print about the battery capacity and max current, but nothing official from Tesla.
    Thanks for the link.

    Mike

  7. #7

    Default Re: Anyone know the deails on Tesla's new 2170 (21x700mm) cell?

    Quote Originally Posted by StorminMatt View Post
    Another advantage of larger cells is that the ratio of the volume of the can to the volume of active material decreases as cell size increases. So a greater proportion of the volume of each cell actually contributes to energy storage as cells get bigger. Also, fewer cells to manage means a less complex (and, therefore cheaper) battery management system.
    I have a feeling aside from perhaps connecting the cells together (wiring,tabbing) the battery management system overall won't change enough to be less complex or cheaper. I think the price/cell is the main reason for the change. If you consider that you can go to a store and buy AA and AAA batteries and also C and D batteries for the same prices even though the size/power of the cells differ considerably one could consider similarly with 21700 vs 18650. It may be the cost of the "guts" of the batteries is considerably less than manufacturing and other costs per cell.
    It is possible that as newer more advanced batteries come to market that cell sizes increase dramatically more. It may be we see single cells that end up the size of large coffee containers come to market.
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