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Some questions about battery management

Hi,

We usually use a charger for battery management, but the impendance is different for each battery.when two batteries are charged in parallel,the current flowing into each battery is different.

Maybe one battery voltage is higher than another one,the current may flow into the lower voltage battery.Can this operate correctly?

In another case,two batteries are charged in series.Although the current is the same for every battery,due to different impendance,each battery voltage is different.How to ensure that each battery is charged fully?

Thanks!

  • hey user4768469,

    If you use a charger for battery management in the parallel cell case, you are correct, the current will be different if the internal cell impedance is different. However, this can operate correctly as parallel cells are held at the same voltage through their parallel connection, and any mismatches -- without an external charge voltage applied -- will balance capacities. The one thing to note is a short in a parallel configuration. If one battery fails/shorts internally, then you risk damaging all cells as you will over-discharge.

    The other case, a series connection, is usually handled by some sort of cell balancing circuit, either passive or active. You can read TI app note here that describes series balancing.

    Hope this helps,

    Regards,

    Joel H