BQ27520-G4: Gauging Parameter Calculator report is fail

user6229777

Part Number: BQ27520-G4

I submitted my data to GPC tool.
But the report was fail.
Althoug I confirmted the file format, I couldn't find out the wrong point.
So could you confirm the attached file I submitted to GPC tool?

Best Regards,
Thnaks
Yuichi TsutsuiGPC_Tool_200519.zip GPC_Tool_200519-report.zip

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

Your issue has been assigned to one engineer and we will get back to you.

Andy

0 Andy Liu (BMS) over 5 years ago in reply to Andy Liu (BMS)

TI__Guru 52115 points

I see you set the NumCellSeries to 2. Are you sure the log file is for two batteries in series?

Andy

0 user6229777 over 5 years ago in reply to Andy Liu (BMS)

Intellectual 700 points

Dear Andy-san

Yes, our batteries is in series.

But, the half of the batteries voltage is input to BQ27520.

The following circuitry is the one around BQ27520.

Best Regards,

Thanks

Yuichi Tsutsui

0 Andy Liu (BMS) over 5 years ago in reply to user6229777

TI__Guru 52115 points

Can you share this battery's spec? Thanks.

0 Yevgen Barsukov over 5 years ago

TI__Intellectual 1090 points

The number of serial cells should correspond to the voltage data that is in log file,

so if you are reporting pack voltage, you write your actual number of cells (in this case 2), but

if you provide single cell voltage data, you write 1.

In this case you are using single cell data, unless this is not a Li-ion cell, voltage looks like single cell,
so you have to set 1 as your number of serial cells.

ElapsedTime	Temperature	Voltage	AvgCurrent
4.001	22.45	3222	508
8.001	22.45	3223	508
12.002	22.45	3226	508

Regards,

Yevgen

0 user6229777 over 5 years ago in reply to Andy Liu (BMS)

Intellectual 700 points

Dear Andy-san

I will share the battery's spec.

Please refer to it.

Thanks

0 user6229777 over 5 years ago in reply to Yevgen Barsukov

Intellectual 700 points

Dear Yevgen-san

Thank you for your reply.

I know the number of serial cells should correspond to the voltage data that is in log file.

Our battery pack has two Li-Ion cells in series.

But BQ27520 is battery fuel gauge for single-series cell Li-Ion battery.

So in our application, the voltage of battery pack is input to BQ27520 with half of voltage using voltage follower circuit.

In this case, do I have to set 1?

Best Regards,

Yuichi Tsutsui

0 Yevgen Barsukov over 5 years ago in reply to user6229777

TI__Intellectual 1090 points

yes, as long as the voltage in the data corresponds to single cell (because of divider or other reason), it should be set to 1.

Regards,

Yevgen

0 user6229777 over 5 years ago in reply to Yevgen Barsukov

Intellectual 700 points

Dear Yevgen-san

Thank you for your reply.

I will submit the data again with that parameter set to 1.

Best Regards,

Thanks

Yuichi Tsutsui

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BQ27520-G4: Gauging Parameter Calculator report is fail