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Pics/Info: Inside the Tesla 100 kWh Battery Pack

Discussion in 'Model S: Battery & Charging' started by wk057, Jan 24, 2017.

  1. wdolson

    wdolson Well-Known Member

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    Sorry I was sloppy. I have chastised others for that mistake too. My bad :(

    It looks like I found a bad number to start with. Google is so America-centric that searching for "world" keeps coming up with numbers for the United States. Searching for "petrol" gets a more global number. Anyway, the numbers are:

    93 million barrels/day (as of 2015) * 42 US gallons/barrel * 33 KWH/gal = 128.9 TWH/day

    Solar radiation on the Earth is 174 PW, which would be 174 PWH/H or 4.18 EWH/day (174 PWH/H * 24) to use the same units. As said before about 30% is reflected back into space, so 2.9 EWH/day.

    So all the heat produced by all ICE cars and other gasoline/petrol use is about 0.004% of what the sun pumps in every day.

    Each human produces about 2.4 KWH/day of body heat (100 WH/H * 24). With 7 billion humans, that is 16.8 TWH/day in just human body heat. Which is a factor of magnitude less than gasoline heat, but both are still down in the noise compared to what the sun pumps in.

    Sorry about the unit confusion.
     
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  2. SeminoleFSU

    SeminoleFSU Voluntaryist

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    Some of us don't want to live in urban centers. We want the freedom to live where we choose, and have more control over our private property that we own. Relinquishing your right to control the property you live on is a huge mistake. It's also important to note that not everyone can afford to live in urban areas depending on their income and expense (family) situation. Therefore the commute problem will not be going away anytime soon (as long as they can't pull off something like Agenda 21) so EVs, car/van/bus pooling, etc and other creative solutions must continue to solve the problem.
     
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  3. SucreTease

    SucreTease Teslarian

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    Sorry to be blunt and pedantic, but again, sloppy use of units, which really bugs me as a physicist. Units obey the same math that number do. The correct math is 174 PW * 24 h/day = 4.18 EWh/day; and 100 W * 24 h/day = 2.4 kWh/day.
     
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  4. scaesare

    scaesare Well-Known Member

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    Or was it?
     
  5. jimbo69ny

    jimbo69ny Member

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    Lets please stay on the 100kwh Tesla battery pack topic.
     
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  6. SeminoleFSU

    SeminoleFSU Voluntaryist

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    Agree with everything you said except for Tesla making smaller battery cars. I personally went from a P85 to 100D because I wanted the additional range and less time on the superchargers when road tripping. It also should help reducing the degradation because pack cycles are more shallow on my 90 mile round trip M-F into the city.
    I think what we need is choice. Smaller and larger batts... Choice + Variety = more EV adoption.
     
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  7. supratachophobia

    supratachophobia Active Member

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    "Let's stick to Rampart people."
     
  8. wdolson

    wdolson Well-Known Member

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    I tutored Physics for 4 years in college (my degree is in Electronic Engineering). Making it 174PWH/H is a bit more awkward, but the units do work out.

    Trying to get back on topic, most of the discussion has wandered away from the 100KWH battery into more general battery discussion. Even if Tesla makes 18650s for the S/X at the GF1, I think they will start making batteries for the S/X in Nevada sometime this year. That frees up the Panasonic factories in Asia to make batteries for Asian production.

    The demand for Li-Ion cells is so high now, Panasonic could probably find a buyer for cells from their Asian plants pretty easily if Tesla didn't need them anymore. The demand situation is very different from 2012 when Tesla was the only company interested in large volumes of Li-ion cells. The cells Panasonic is making for Tesla are proprietary, but Panasonic has their own chemistries they could make.
     
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  9. JRP3

    JRP3 Hyperactive Member

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    If his units were sloppy how did you both reach the same number?
     
  10. Timothyj999

    Timothyj999 Member

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    Because Until we build a perpetual motion machine and negate the laws of thermodynamics, waste heat is unavoidable. EV’s are much more efficient than IC vehicles, and they produce a much smaller percentage of waste heat per horsepower even as they avoid CO2 emissions.
     
  11. lolachampcar

    lolachampcar Well-Known Member

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    Black Body Radiation
     
  12. camthehombre

    camthehombre Member

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    This is what I want to know as well. Is it possible the car can accept a slightly higher charge for a bit longer or in other words have the charge curve/taper changed slightly? Not sure if it's possible or not. I'm wondering if heat is the issue if the car could recognize being plugged in and start the cooling fans to max before the battery gets too hot to keep charging at a high rate longer or something like this. I'm not even sure a firmware update could have an impact on the rate a battery can handle in older cars of if they are already maxxed out.
     
  13. ajdelange

    ajdelange Active Member

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    Not really. It's 3.1678e-05 g.
     
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