BQ40Z50: SOC change

Sunrain

Intellectual 615 points

Part Number: BQ40Z50
Other Parts Discussed in Thread: GPCCHEM

Tool/software:

Hello;
I am using BQ40Z50-R5, what is the cause of this failure

Thanks

5 months ago

0 Alan Frias 5 months ago

TI__Mastermind 25965 points

Hello Sunrain,

It seems that you either set your design capacity really low for your system and/or you have the wrong chemID selected. I would rerun calibration in the calibration tab and run a GPCCHEM calculator to get a ChemID with a error difference of 3% and below.

GPCCHEM
https://www.ti.com/tool/GPCCHEM

Thank you,
Alan

0 Sunrain 5 months ago in reply to Alan Frias

Intellectual 615 points

Hello Alan,

The setup is fine, but during the run it suddenly jumps to 255%. Is this 255% a fault code?

Thanks

0 Alan Frias 5 months ago in reply to Sunrain

TI__Mastermind 25965 points

Hello Sunrain,

It sounds like you most likely have the run chemID or set the "Design Capacity" wrong within the data memory tab. I would lend on the ChemID and rerun the GPCCHEM calculator and use a the ChemID with 3% error differences and below.

Thank you,
Alan

0 Sunrain 5 months ago in reply to Alan Frias

Intellectual 615 points

Hello Alan，

There is no problem with these Settings and they have also gone through GPCCHEM. There was no problem with the other battery cycles, and only one battery pack had this anomaly. I think this is a fault code, so I want to know which situations will occur 255%. And I don't think "Design Capacity" will cause SOC failures, it should affect SOH.

Thanks

0 Alan Frias 5 months ago in reply to Sunrain

TI__Mastermind 25965 points

Hello Sunrain,

After consulting with the team the most likely issues is your resistance table is off for your system and that is directly linked to you ChemID. Please re-calibrate your IC within the calibration tab and re-run your GPCCHEM calculator and use a chemID that is less than 3% error difference.

GPCCHEM:
https://www.ti.com/tool/GPCCHEM

Thank you,
Alan

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BQ40Z50: SOC change