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BQ40Z50: R184 burned out issue

Cherry Zhou
Mastermind 22235 points
Part Number: BQ40Z50

Hi team,

Here's a case from the customer may need your help:

After the battery is soldered, there is a 1% probability that R184 will burn out, as the following figure:

The battery is soldered from negative to positive from small to large, and after the final positive solder, the cell 1 voltage is found to be abnormal through the bq studio tool, which is not consistent with the actual cell voltage. It's found that R184 is burned out.

Could you help check this issue? Thanks.

Best Regards,

Cherry

  • 0
    TI__Guru** 105770 points

    Hell0 Cherry,

    It looks like this resistor could carry some current depending on what's attached to BAT- and not PACK-. Can you confirm what conditions the resistor is damaged?

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Mastermind 22235 points

    Hello Wyatt,

    Wyatt Keller said:
    Can you confirm what conditions the resistor is damaged?

    When the positive pole is soldered, the string of cells is soldered from negative to positive. Before finally soldering the positive pole,  the measured resistance is ok. Bu after soldering the positive pole, they see the resistor is damaged.

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Guru** 105770 points

    Hello Cherry,

    This would indicate to me that something is shorted from the battery + to the GND net labelled "F" in the schematic. This could be from bad wiring or from a schematic that's not wired correctly. I would recommend they check their connections and full schematic for any large current paths from the battery to the battery GND through the resistor.

    Sincerely,

    Wyatt Keller