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BQ27542-G1: BQ27542-G1

Jamie Tseng
Intellectual 2405 points
Part Number: BQ27542-G1
Other Parts Discussed in Thread: GPCRB

Hi Team,

Here are two questions that need your help:

1. Fully charged battery pack, Gauge IC BQ27542 full charge capacity value of 4897mAhr at room temperature (25 ℃), and 2646mAhr at low temperature (-30 ℃).

Will the change in this value affect the State of charge parameter? Will it prevent the battery from fully discharging its capacity at low temperatures?

2. We used the TI EV2300 kit to capture the discharge LOG during the test of the battery low-temperature discharge curve and saw that the State Of Charge parameter suddenly changed from 93% to 0% after six minutes of starting discharge.

Then after three minutes, it changed from 0% to 82%.

Thanks and best,

Jamie

  • 0
    TI__Guru 52115 points

    Hi Jamie,

    Usually -30C is very challenging for most battery packs.  Most of them cannot perform well and have a very little usable capacity.  I would suggest your customer double check performance of their battery pack at that temperature.   The gauge cannot help if the battery performs poorly by itself.

     

    Andy

  • 0 in reply to Andy Liu (BMS)
    TI__Intellectual 2405 points

    Hi Andy,

    The battery we chose is a battery for low temperature applications. From the discharge curve given to you before, it can be seen that the PACK is at -17 degrees and 82%. When the current is discharged from 4A to 0%, it can also be discharged for 1hr, which is equivalent to 4000mAhr. 72% capacity (total capacity 5500mAhr).
    Only from 100% to 82%, there is a sudden drop in capacity to 0%, and after three minutes, it will return to 82%. This situation will make our system think that the battery is really 0%, and then enter the shutdown mode. Please help analyze the reason why this situation occurs, we see there are ways to avoid it?

    Thanks and best regards,

    Jamie

  • 0 in reply to Jamie Tseng
    TI__Guru 52115 points

    I would suggest you use the GPCRB tool below to optimize low temp parameters.

    Andy