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 or making a Paypal contribution here: paypal.me/SupportTMC

Last minute speculation: How to swap the battery without moving the battery

Discussion in 'Charging Standards and Infrastructure' started by Bipo, Jun 20, 2013.

  1. Bipo

    Bipo Member

    Joined:
    Jan 17, 2012
    Messages:
    257
    Location:
    Spain
    #1 Bipo, Jun 20, 2013
    Last edited by a moderator: Mar 13, 2016
    Hello folks!

    I know the demonstration will be carried out in a few hours, however I have figured out a way to swap the battery without moving the battery across the car, but moving the car across the battery.

    The idea is inspired in the variable gauge trains that are running through Spain. In the facilities where the axles actually modify their gauge the bogies run over a slipping surface while the axles get unloaded and then their wheels are displaced by passive rails.

    If we try to apply this to the Model S, the battery swapping station would be like a washing tunnel, where the car enters and keeps moving while the battery is dropped in a certain place and the new battery, that lays on the ground a few meters further, is inserted as the car advances.

    Remember that the battery weights almost 1,000 lbs, so removing it from the car will make it rise up suddenly, due to the same springs dealing with noticeable less weight.


    Maybe it's a crazy idea or maybe not... But I wanted to share it with you before we know the system developed by TM :)

    Here is a video of the gauge exchanger devices found in the Spanish Railways:

     
  2. yobigd20

    yobigd20 Well-Known Member

    Joined:
    Oct 28, 2012
    Messages:
    5,793
    Location:
    Skaneateles, NY
    My guess would be that no matter if the car is being moved or it is stationary, it's certainly going to be locked into place on some lift device either way.
     
  3. Bipo

    Bipo Member

    Joined:
    Jan 17, 2012
    Messages:
    257
    Location:
    Spain
    #3 Bipo, Jun 20, 2013
    Last edited by a moderator: Mar 13, 2016
    Here you can better see what I mean:



    If you watch the video carefully, you can see the blue locking devices that are pulled out by the red I-shaped bars. Those bars are no more than a rail with different height all the way though the gauge exchanger, so they are completely passive and moves the locking devices thanks to the forward movement of the bogie.

    In this video you can see how is their profile: They get down and up (the red bars):




    If we see the bottom of the Model S battery pack, it has rails that look as designed for this purpose. They match the Talgo RD design:

    WSg8REf.jpg

    T7z8NeF.jpg


    The advantage of this system is the reliability: As the battery is physically guided and then forced to get down and up, it cannot be misguided, fall or remain stuck.

    I repeat that this is just product of my imagination, but would be suitable for the Model S.

    - - - Updated - - -

    I do not agree with you: If we look to the pic tweeted by Elon, we can see a platform of just 8 or 10 inches tall and about 40 feet long where the Model S rolls over to swap its battery. It fits with my theory:

    XGpeysJ.jpg

    The battery to be dropped is stored at the beginning of the platform while the battery to be inserted remains in the final part of the ramp. The car rolls over that, drops one battery and gets the other, all in a 40 feet run.
     
  4. deonb

    deonb Active Member

    Joined:
    Mar 4, 2013
    Messages:
    3,020
    Location:
    Redmond, WA
  5. NigelM

    NigelM Recovering Member

    Joined:
    Apr 3, 2011
    Messages:
    13,257
    Location:
    Sarasota, FL
  6. Bipo

    Bipo Member

    Joined:
    Jan 17, 2012
    Messages:
    257
    Location:
    Spain
    Yeah, I read your post this morning and aha! the traction during swapping may be an issue. But as my proposal only requires the car to move forward for 40 feet, that push can be provided:

    a) By the inertia of the car moving before entering (I don't think so)
    b) By the 12 V battery (definetly not enough to feed the power electronics)
    c) By a sort of capacitor designed for this purpose (seems feasible)
    d) Another way (electrified rails feeding the PE, etc.)

    e) A lever pushing the car as in the washing tunnels

    - - - Updated - - -

    Yes, that is true... But I though this idea might be worth of a different thread.

    Anyway if you mods consider it adequate, feel free to close this thread and merge it with the main one.
     
  7. stopcrazypp

    stopcrazypp Well-Known Member

    Joined:
    Dec 8, 2007
    Messages:
    7,049
    I think the way most people read your comment is that there is some hardware on the car "actively" involved in the swapping (most likely some kind of robotics). This proposal has the hardware on the car still passive and like Bipo point out only some kind of push needs to be provided.
     
  8. Bipo

    Bipo Member

    Joined:
    Jan 17, 2012
    Messages:
    257
    Location:
    Spain
    My theory seems to be correct :biggrin:



     
  9. Tacket

    Tacket Member

    Joined:
    May 31, 2013
    Messages:
    268
    Location:
    Mukilteo, WA
    Almost!
     
  10. Bipo

    Bipo Member

    Joined:
    Jan 17, 2012
    Messages:
    257
    Location:
    Spain
    :biggrin:

    :wink:
     

Share This Page