Power in Flux
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Thread: 400 wh/kg is here ?

              
   
   
  1. #1
    Senior Member Hugues's Avatar
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    400 wh/kg is here ?

    Any opinion on this company ?

    http://enviasystems.com/announcement/

    claiming 400 wh/kg, tested independently,

    today's press release:
    http://enviasystems.com/pdf/Press_Release_400WHK.pdf
    Regards from Switzerland
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  2. #2
    teddillard
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    The whole thing feels very understated. Also, there seems to be some pretty good independent testing and actual delivered product.

    Imagine that!

    Looks awesome to me!

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    Moderator Nuts & Volts's Avatar
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    Definitely does not seem like vaporware with actual costs, but I will bet it won't be manufacturer-able or cheap enough for consumer cars for another 5 years or so.

    Prove me wrong GM! haha
    Whats under my tank may shock you!!! R6 Build, Blog/, [/URL] OSU Current webpage

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    Moderator ZoomSmith's Avatar
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    That's all great press-release material, but I don't see a distribution channel listed.
    How are you going to obtain these "super-awesome" cells?

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    Senior Member larryrose11's Avatar
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    In the introduction area, they say they only did 23 cycles, but the chart list 300 cycles. The chart also shows an intal steep drop in capacity, (about 23 cycles?) and then flattens out. No mention of this 300 cycle test, or did I mis somthing?

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    Quote Originally Posted by larryrose11 View Post
    No mention of this 300 cycle test, or did I mis somthing?
    "Similar cells have been cycling in Envia’s test labs for over 300 cycles."

    Anyway, this cells have low power density.

  7. #7
    Senior Member Hugues's Avatar
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    Quote Originally Posted by Kane View Post
    Anyway, this cells have low power density.
    ??
    you mean you don't believe they have 400 wh/kg
    or
    you say 400 wh/kg is low power density ?

    from this chart, 400 wh/kg is double of the best cells available:
    http://mabula.tangram.dnsalias.net/b...l_stats?s=whkg
    Last edited by Hugues; 27 February 2012 at 1315.
    Regards from Switzerland
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  8. #8
    Senior Member Skeezmour's Avatar
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    Quote Originally Posted by Hugues View Post
    ??
    you mean you don't believe they have 400 wh/kg
    or
    you say 400 wh/kg is low power density ?

    from this chart, 400 wh/kg is double of the best cells available:
    http://mabula.tangram.dnsalias.net/b...l_stats?s=whkg
    There is a difference between energy density (400wh/kg) and power density (400w/kg as an example). so if I had a 4kwh pack it would only be good for 4kw output. There are cells that have amazing energy density but you have to pull it out very slowly. Then there are cells with AWESOME power density but not very high energy density. Trick is getting cells with the right balance for your application.

  9. #9
    Senior Member Hugues's Avatar
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    ..and i stand corrected !
    thanks

    but what's their w/kg then ? so we can benchmark them against this chart
    http://mabula.tangram.dnsalias.net/b...l_stats?s=whkg
    Last edited by Hugues; 27 February 2012 at 1326.
    Regards from Switzerland
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  10. #10
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    This cell and the other dozen high voltage chemistry options all have the same problem, no solvent/electrolyte exists that doesn't rapidly decompose OR cost $10,000 per liter.



    I edited my post. I would just like to say, I REALLY REALLY hope this is not something that involves unobtainium, unicorn horn powder, or doesn't have a mechanism to increase the C-rate and cycle life.

    Because 16kw-hr's of energy storage for 40Kg of weight would make every motorcycle be an electric.
    Last edited by liveforphysics; 27 February 2012 at 1923.

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