BQ27Z561-R2: Can I use this gauge with battery cell that has integrated protection circuit?

Aivaras

Part Number: BQ27Z561-R2

Dear all,

In all BQ27Z561-R2 documentation I see that protection circuit is shown after the gauge and cell solution. Meaning that when protection trips cell and gauge stays connected and only system is disconnected from PACK terminals. However all Li-polymer cells are sold with integrated protection circuit. Can I use Li-polymer battery with integrated protection circuit? Meaning that in malfunction scenarios when protection will trip my gauge will lose power and will stop gauging until I will enable charger and reset the protection circuit.

I understand that while protection circuit will be engaged I will not be able to communicate with gauge, but I'm more concerned to hear are there other downsides that I do not think about? Will gauge retain cell info and history in this event?

Regards

Aivaras

5 months ago

+1 Shirish 5 months ago

TI__Guru 57747 points

Hello Aivaras,

When the gauge loses power it will lose all RAM data and will behave similar to reset. Which means it will no longer be as accurate as it was before it lost power. The recommendation is to use the gauge reported data to shutdown the system gracefully before triggering the battery integrated protection. This ensures power to the gauge.

0 Aivaras 5 months ago in reply to Shirish

Prodigy 135 points

Hello Shirish,

but in power loss gauge will retain design information like battery design capacity, calibration info. It will only lose live data in RAM? And it will regain accuracy after few charge cycles?

0 Shirish 5 months ago in reply to Aivaras

TI__Guru 57747 points

Yes

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BQ27Z561-R2: Can I use this gauge with battery cell that has integrated protection circuit?