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Cooling Battery Cells vs Battery Packs

Discussion in 'Battery Discussion' started by thelastdeadmouse, Jul 17, 2017.

  1. thelastdeadmouse

    Apr 11, 2012
    Potsdam, New York
    I'm curious is anyone knows, when Tesla packs overheat, is it primarily a limit of the cooling system design for the pack coolant (radiators, coolant capacity), or is it more limited by heat transfer rate at the individual cell level? The reason why I'm wondering is that if is a matter of heat transfer rate from the individual cell to the coolant, what effect could the slightly larger diameter of the new 2170 cells have vs 18500 cells for maximum discharge rate? Obviously the larger the diameter, the lower the ratio of surface area to volume, the less heat transfer area per kWh.
  2. JohnSnowNW

    JohnSnowNW Active Member

    Feb 13, 2015
    I'm not familiar with Tesla packs overheating. Are you sure you're not thinking of the motors?
  3. jkn

    jkn Member

    Nov 29, 2013
    I don't know, but I guess problem is in too small radiator. If not, they have a problem:
  4. jaguar36

    jaguar36 Active Member

    Apr 10, 2014
    If you try to take an S to the track basically everything overheats, the rotor and the stator first, then the inverter and then the pack. They all cool at different rates so its possible to overheat one and not the others if you are doing a certin combination of power on/off. Pack takes the longest to cool down and its a combination of the cooling system and the cell size. Lower coolant temps will cool the cells faster regardless of if they are bigger or smaller, so smaller cells would help, but so would a more capable coolant system.

    Bottom line the S was designed and optimized for street use, not the track. The 3 is likely to be the same, so don't expect to be able to track it with any success.

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