BQ40Z50-R3-DEVICE-FW: Gauge shuts down unexpectedly

Federico Silva

Part Number: BQ40Z50-R3-DEVICE-FW

Hi,

I have 3s1p configuration, whose configuration I attach. We tested them for a load charge and found that the gauge shuts down and we cannot find the reason why.

Below you'll find the data acquired via Battery Studio, in which at first the batteries are charging and then we leave them to power the system. As you see, a little over 23 mins (~40 s after disconnecting the adapter), the system shuts down. As far as I can see, all the parameters seems to be within the safety margins. Do you see anything that could cause this? Another weird thing is that when restarting, the batteries SOC is 0%.

Thanks,

Federico

4010.config.gg.csv

over 4 years ago

0 Wyatt Keller over 4 years ago

TI__Guru** 105590 points

Hello Federico,

Can you share the whole bqStudio log so we can review the data?

All of the conditions for shutdown are outlined in the TRM: 5.4 SHUTDOWN Mode

Check if the conditions for shutdown were met to verify if the gauge did shutdown.

Sincerely,

Wyatt Keller

0 Federico Silva over 4 years ago in reply to Wyatt Keller

Intellectual 795 points

Hi Wyatt,

I don't any reason why it could shut down. I attach you the log so you could see if you find any problem.

Thanks,

Federico

7043.LOG.zip

0 Wyatt Keller over 4 years ago in reply to Federico Silva

TI__Guru** 105590 points

Hello Federico,

Is the TS pin pulsing while in this state? Can you turn on lifetime data tracking and then pull the .gg file after the test so we can see if it is going into shutdown.

How do you wake the gauge back up?

Sincerely,

Wyatt Keller

0 Federico Silva over 4 years ago in reply to Wyatt Keller

Intellectual 795 points

Hi Wyatt,

sorry for the late response. I'm not sure I did the test right, but here's is the info I got back.

Thanks,

FedericoBattery tests.zip

0 Wyatt Keller over 4 years ago in reply to Federico Silva

TI__Guru** 105590 points

Hello Federico,

I was curious when the gauge is in what may be shutdown, is the TS pin pulsing when it's in that mode? Can you measure it with a scope? Did you enable the lifetime data and pull the .gg file from before and after the test to see if any protections were triggered and if the shutdown counter has increased?

Sincerely,

Wyatt Keller

0 Federico Silva over 4 years ago in reply to Wyatt Keller

Intellectual 795 points

Hello Wyatt,

I've done those measurements and the TS pin does pulse after the system shuts down. I attach you the lifetime files before and after. I see the issues but I don't understand why the conditions trigger at the same time and the same number of times. Besides, I don't understand why after this issue, the SOC goes down to 0%, even though it showed 80% right before shutting down.4061.before.gg.csv

0407.after.gg.csv

Thanks,

Federico

0 Wyatt Keller over 4 years ago in reply to Federico Silva

TI__Guru** 105590 points

Hello Federico,

Can you share the GPCCHEM report used to find your chem ID?

If the TS pin is pulsing then the gauge didn't shutdown, it is in sleep mode. Also from the lifetime data it looks like you have a OTD and CUV event occurring during the test.

Sincerely,

Wyatt Keller

0 Federico Silva over 4 years ago in reply to Wyatt Keller

Intellectual 795 points

Hello Wyatt,

Thanks for the answer. Do you mean the ChemID? We used the 0x2017.

Federico

0 Wyatt Keller over 4 years ago in reply to Federico Silva

TI__Guru** 105590 points

Hello Federico,

How did you select the chemID you used? Usually we recommend following the steps for GPCCHEM to find the best matching chemistry ID.

Sincerely,

Wyatt Keller

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BQ40Z50-R3-DEVICE-FW: Gauge shuts down unexpectedly