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parallel battery charging?

Alex Rodriquez
Prodigy 40 points
Other Parts Discussed in Thread: BQ2000T

Hi,

I'm currently designing a circuit to charge a battery pack using the bq2000t. As of now this circuit was designed to charge three NiMH AA batteries in series but for my purposes I was wondering if it was possible to increase the capacity of my battery pack. My thinking was that if I put three more batteries in parallel with the original three NiMH batteries i could double the battery capacity. By doing this however, I was wondering if I'd run into a few problems. For instance: would the current output of the bq2000t need to double or would having these extra batteries also raise the rate of heat measured by the thermistor? I guess my main question is what would I have to change in my battery charging circuit that would allow me to put another three NiMH batteries in parallel to the original three. Thanks in advance.

  • 0
    TI__Guru**** 150790 points

    If the batteries can be paralleled, then you would need to double your fast charge current to keep the same current going into each cell.

    However, you need to confirm with your battery manufacturer that you can parallel their cells.  We cannot recommend doing this as we do not make your cells.  There are possible safety issues if one cell/string is lower impedance than the other, if one string has a lower voltage than the other and is suddenly connected in parallel, etc.