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Please Suggest a Battery Charger System/Solution

Gary Poon
Intellectual 510 points
Other Parts Discussed in Thread: BQ24171, BQ24725A

I would like to build a battery charging system for a product. Could you suggest a battery management system solution?

The loading of this product consist of a DC motor (about 10 W)  and a heater (about 240 W). The battery is Li-Po, 3S, about 4000mAh. Nominal discharge current is about  22.5A. Charge current is about 1.5A-2A. The battery will have its own protection circuit module (PCM). Charge power/current would be supplied by an external adapter.

As such a high loading current, the load current should not drain from the adapter, so it should be always drain from the battery. As such, I guess the management IC should be able to determine or control when to charge and discharge the battery. In the other words, when user switch on the product, it should discharge current from the battery to the load no matter the product is connected to the external adapter or not. When the product is switch of and connected to the adapter, it should charge the battery.

Could you suggest or help me to select a suitable battery management solution?

Thank you very much.

  • 0
    Intellectual 510 points
    I would like to added that if there are options, I would like a easier solution :)
    Thank you.
  • 0 in reply to Gary Poon
    TI__Genius 10240 points
    Gary,

    Sorry for the delay because we missed this thread earlier. As the discharging current is very high, the impedance on the discharging path could generate high voltage drop. The adapter is not intended to power up the system, so I would suggest to separate the charging and discharging path. The system load could be connected to the battery directly or through a control circuit to control the on/off of the load (motor and heater). For charging, TI has rich portfolio for 3S battery charging such as BQ24171 or BQ24725A. Please be advised that the FET controlled by BATDRV could not prevent the current flowing from battery pack to system. The circuit is to reduce the power loss of by using a FET instead of a diode.