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BQ24600: 20cell Ni-MH.

Kengo.Y
Guru 11295 points
Part Number: BQ24600
Other Parts Discussed in Thread: BQ24610

Tool/software:

Hi team,

I'm using 20cell NiMH batteries. Can I use the charging IC with the BQ24600?
If no, could you recommend other device?

Vin= 24V
*Adjustable are possible.

BR,
Kengo.

  • 0
    TI__Mastermind 35246 points

    Hello Kengo,

    What is the maximum battery voltage?

    is it 32V=(20*1.6)

    Best Regards,

    Christian

  • 0 in reply to Christian Moyer
    Guru 11295 points

    Hi Christian,

    Thank you for your reply.

    No, 1cell = 1.2V.
    So, 20*1.2 = 24V

    BR,
    Kengo.

  • +1 in reply to Kengo.Y
    TI__Mastermind 35246 points

    Hello Kengo,

    Kengo.Y said:
    Vin= 24V

    This will need to be increase to 1.5V-2V greater than max battery voltage.

    I would recommend BQ24610 over BQ24600. While neither device is specifically tailored for Nickel-Metal Hydride (NiMH) batteries, with careful configuration and external control, it can be adapted to charge NiMH cells.

    Here are the recommended steps:

    1. Set Charge Voltage: Configure the voltage regulation loop to match the typical peak voltage of your NiMH pack. 
    2. Program Charge Current: Determine an appropriate charge current, typically between 0.1C to 0.5C 
    3. Implement External Termination: Since the BQ24610 doesn’t support −ΔV detection, use an external microcontroller or monitoring circuit to detect full charge by monitoring voltage drop or temperature rise, and then disable charging via the CE (Charge Enable) pin.
    4. Safety Timer: Utilize the BQ24610’s safety timer as a backup to terminate charging after a predetermined period, reducing the risk of overcharging.

    Best Regards,

    christian