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BQ77PL900: application problems

Cherry Zhou
Mastermind 22235 points
Part Number: BQ77PL900

Hi team,

Here's an issue from the customer may need your help:

 The customer used BQ77PL900 to connect 8 groups of tandem lithium-polymer.Each battery pack has 5 pieces of lithium-polymer in parallel  .Each battery voltage 4.2V. The designed board can work normally.

Now they are going to replace lithium-polymer with Li-Lion of the same voltage  . Use This board to Connect 8 groups of tandem Li-Lion.Each battery pack has 6 pieces of Li-Lion in parallel. However, after the Li-Lion battery pack is connected to the board, overvoltage is displayed  . Is there any difference between LI-lion and li-polymer for BQ77PL900 that should be noticed?

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 36520 points

    Hello Cherry,

    This is an older part, so a bit more difficult to support. But I will do my best to assist you.

    The BQ77PL900 should only measure the voltage.

    • Are the device's settings configured for the new battery voltages?
    • What is their battery voltage and measured?
    • What over-voltage threshold did they choose? 

    Best Regards,

    Luis Hernandez Salomon