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Charging Lithium Ion Polymer (Li-ion) Battery

Lithium or Li-ion batteries are cheap, easy to use and recharge. There is actually no difference between Lithium Ion and Lithium Ion Polymer.
The advantage of the Li-ion is that the size is smaller, come in various sizes, actually they can be 1 mm thin and they are flexible.

There are 2 different types of Li-ion, the new one with graphite anode and one with coke anode (the traditional one). The advantage of the graphite anode is that the dropdown voltage is much smoother. The temperature of the battery will not be as high as the NiMH one in the charging process.

The charge uses the constant current – constant voltage process. The charging current is ~ 0.5/C, where C is the current capacity but it depends from manufacturer to other. For more details watch the video tutorial from EEVblog.

Lithium Ion Battery Video Tutorial

6 Comments

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  • Benno

    Phantastique!
    thx a million for your elaborate and attentionkeeping explanation of Li-ion

  • John Waterman

    That’s very interesting cezar. Do you happen to know of a circuit like the one you describe?

  • cezar

    Charging li-ion, batteries are no magical feat,except for their inherent danger of going up in flames, only when over charged and over discharged, aside from that they are excelent power source, as a matter of fact the most simple charging circuit that I have came accross with was composed of two voltage regulators wired in series, one produces a constant voltage similar to the battery voltage, and the other is wired as a constant current source, what is of real concern would be, when to stop the charging proccess, once the knee or the 98% or so of capacity is achived.

  • Marie Konieg

    Any possibility of a capable and safe DIY lithium ion polymer battery charger in the near future?

    Thanks

    • P. Marian

      I hope so :). If you find a good Li-ion charger circuit, please email it. Thanks a lot.

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