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BQ25713: Help understanding CC and CV Timing Control in BQ25713

Brijraj Kacha
Prodigy 40 points
Part Number: BQ25713

Tool/software:

Hello everyone,

I'm new to battery charger designs and planning to use the BQ25713 IC to charge my 3S2P Li-ion battery pack. I'm trying to understand if it's possible to control or influence the timing or duration spent in the Constant Current (CC) phase versus the Constant Voltage (CV) phase.

In simpler terms, can we configure or adjust how quickly the charger transitions from CC mode to CV mode, or is this timing fixed internally based on battery conditions? I'm not sure if this question is fully accurate technically, but I would greatly appreciate any insights or clarifications on how CC/CV transitions work specifically in the BQ25713.

Thanks in advance for your valuable guidance!

  • 0
    TI__Mastermind 33275 points

    Hi, 

    You only need to set two parameters for BQ25713. Charge current() and max charge voltage().  See below charge profile. the CC or CV time depends on the battery capacity. If you set charge current() higher, the CC time will be shorter. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 40 points

    Okay, Now I am getting it a little bit.

    So, if I want to fast charge my 3S2P battery, (which has LG INR18650MJ1 3400mAh (3c) LI-ION cells).

    The individual max charge current for the cell is 3.4A, so for the battery pack is the 6.8A. 

    So is there any equation or something to calculate the charging time (CC time and CV time) with reference of charging current given?

    Will the CV cycle time be same for all charging current?

    Seeking for insights, I would be grateful for your guidance. 

    Thank you!

  • +1 in reply to Brijraj Kacha
    TI__Mastermind 33275 points

    Hi Brijraj,

    According to the battery capacity, the estimated time is 2x3400mAh divided by charge current. It is around 1 hour. 

    The CV time may be relatively flat for all charging current. Run a few tests, you will get more accurate readings. 

    Regards

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 40 points

    Okay sir, 

    Thank you for your insights! Slight smile