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Battery management for 4 pack NiMH

Jeff LaHay
Prodigy 20 points
Other Parts Discussed in Thread: BQ24600, BQ24400, BQ2002, BQ2000

Hello,

We are trying to build a charger circuit for a four cell (1.2v ea) NiMH battery pack. Is there a TI management controller chip that both limits overcharging (1.42-1.47v) and excessive discharging to say .9v on each cell to prevent damage?

Any help would be appreciated.

Jeff

  • 0
    Expert 1810 points

    Check out the bq24600 multi chemistry charger supporting 1 to 6 cells. The input over voltage protection, input under voltage lock out and the battery over voltage protection features should serve your needs.

  • 0
    TI__Guru**** 150770 points

    The bq24600 does not contain the proper circuitry to detect fast charge termination of nickel cells.  ICs that are designed to fast charge nickel cells include the bq2000, bq2002, and bq24400/1.  Which one to use depends on your available input voltage.  There are lots of existing threads about these ICs in the forums.

    None of those ICs prevent the battery from being discharged too far.  But a simple SVS driving a FET in series with your pack can achieve this.