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BQ76920: Recommendation for a battery power monitoring chip

Gustavo Martinez
Prodigy 10 points
Part Number: BQ76920
Other Parts Discussed in Thread: BQ35100, BQ76905

Tool/software:

Hello,

I would like to request a recommendation for a chip and an evaluation board for my battery use case.

I will be using a NON-RECHARGEABLE ,lithium based, single-use battery in a wireless circuit. This battery will consist of two 3.7V / 19000mAh type D cells in parallel to provide 3.7V / 38000mAh. The maximum current consumption of the circuit will be approximately 100mA for short periods, after which the circuit will enter low power mode to maximize battery life.

Once the battery is discharged, the battery will be replaced with new ones, and the used batteries will be disposed of.

I need a chip for battery monitoring that indicates the optimal time for replacement, as well as a protection circuit or chip to prevent battery damage and avoid a potential battery explosion or fire.

The circuit is intended for a harsh environment with high vibration.

(The part number provided is only to complete the form and enable submission)

  • 0
    TI__Mastermind 38460 points

    Hello Gustavo,

    What is the number of cells for your application? Is it 1 cell, 2 cells or more? For single-cell, a gauging device will likely be best. What types of protections would you want for the battery?

    The BQ35100 is a gauge and end-of-life monitor for primary cells, it supports lithium thionyl chloride (Li-SOCl2)  and lithium manganese dioxide (Li-MnO2). If does not have protections, so you'd need an additional IC for that, but depending on what you need there may be a few recommendations I can provide.

    For more than one cell applications, there are other gauges that may also work. Or use a battery monitor like the BQ76905, which is a 5s battery monitor and protector. This one does not provide gauging, so it would only make actions based on the cell voltage itself, or you could have an MCU making all of the decisions as well.

    Best Regards,

    Luis Hernandez Salomon