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BQ76952: Hijacking the BQ, disconnecting the cells

Joselito Go
Intellectual 2720 points
Part Number: BQ76952

Hi Adrien,

Good day

We want to use the BQ76952 for a product that will work with a Lithium FePO4 8S battery. But this same product will also have the possibility to work with a 24V NiMH battery. On the NiMH battery, we do not have the voltages of each cell, only the whole voltage. We tested the BQ without connecting the cells, and it works. However, is there any risk to using it with its VC0..7 inputs not connected (with just the capacitors)?

Please advise.

Regards,

Josel

  • 0
    TI__Mastermind 20705 points

    Hello Josel,

    This may be possible and could work although we have not tested such configuration.

    You could connect the BQ76952 as such that it will measure the stack voltage, however you likely won't be able to to do protections on the battery unless you are manually controlling the FETs. You would have to disable the OV/UV protections as there would not be individual cell voltages. 

    For the configuration you would only have to short all of the bottom cells together (VC1 to VC15). Then just have the top of your battery connected to BAT+ and VC16. These would be the only ones that would have a filter resistor capacitor. The following drawing may be useful:

    Best Regards,

    Luis Hernandez Salomon