Inductive Charging Li-ion Battery

Discussion in 'General Electronics Chat' started by Anabella, Jan 14, 2010.

  1. Anabella

    Thread Starter New Member

    Jan 13, 2010
    2
    0
    Good morning, :)
    I am trying to learn about inductive charging and how feasible it is for a project that I am working on. I need an expert's opinion or any other input that might be helpful.

    Theoretically, this charging method can be implemented in the device, but I need to find out the size of the secondary coil that would be placed inside the device: how big? What about the charging circuitry?

    Three battery scenarios are being considered:
    -Single cell 18650, 1600mAh Li-ion cylindrical battery
    or
    -Two 18500, 1600mAh Li-ion in parallel
    or
    -Two 18500, 1600mAh Li-ion in series

    I understand that this may be a complex question, but any input would be greatly appreciated.

    What information do I need to find out the size of the coil? How do I know if this method (inductive charging) is feasible? How long would it take to charge these batteries? :confused:

    Please help!
     
  2. rvh002@gmail.com

    Active Member

    May 15, 2009
    118
    2
    I do not understand the term "inductive charging" Any battery has to be charged with DC or pulsating DC,(typically via a SCR). Maybe you should explain a bit more?
     
  3. Anabella

    Thread Starter New Member

    Jan 13, 2010
    2
    0
    Inductive charging means that the device being charged does not have any exposed contacts and the charging occurs via electromagnetic field. The device that charges has a primary coil and the device that is being charged has a secondary coil. When they are in close proximity, energy transfers from one to the other and the batteries in the device get charged. In other words, it is a form of wireless energy transfer.
     
  4. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    I think you will need to build it and test it to get any significant figures.

    As an easy starting point I would go to the discount store and buy one of those $15 rechargeable electric toothbrushes that have a little inductive charger dock on the base. Then see what power you can transfer through that.
     
  5. mixed_signal

    New Member

    Dec 5, 2009
    22
    3
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