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BQ76952: Two stackable Bq76952 for 23S LFP batteries

Deepak Bansal1
Intellectual 300 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQSTUDIO

1. Have a application where need to connect 23S LFP battery with 40A charge current and 250A discharge current.

2. Was reading this post about stacking two bq76952: https://e2e.ti.com/blogs_/b/powerhouse/posts/how-to-stack-battery-monitors-for-high-cell-count-industrial-applications

3. We need to have two independent paths though (oen for charge and another for discharge)and using contractor rather then mosfets since current is large.

4. Also is it possible to get all the protection on standalone basis rather than by external MCU? We want that most of parameters we do program by bqstudio only?

External MCU we prefer to use only for reading parameters output for user

  • 0
    TI__Guru 54715 points

    Hi Deepak,

    The referenced method should work to stack 2 BQ76952 devices. We do not have a reference schematic.

    When using contactors you will need to design an interface circuit between the BQ76952 or combined logic outputs and the contactor drivers.  For FET control since you want to avoid MCU involvement you could use the DCHG and DDSG pins for signaling and CFETOFF, DFETOFF inputs if desired.

    The part can be configured for standalone operation, see the technical reference manual.  You may need some logic circuit and isolation or level shift to recognize suitable recovery conditions and signal recovery for each part with suitable configuration.  You should be able to program the parameters with BQStudio, program to OTP and the part will operate standalone.