BQ27Z746: BQ27Z746_Low temperature optimization

q h

Part Number: BQ27Z746
Other Parts Discussed in Thread: GPCRB

Tool/software:

Hi ti team
I am using BQ27Z746 for low temperature optimization，attached is the optimization file provided by TI, which I used for testing. However, I found that the SOC accuracy was very high at 1A low temperature discharge, but the SOC accuracy of 2A low temperature discharge was significantly worse.Is there any way to improve the SOC accuracy of 2A low temperature discharge?

1346.1A@-20℃.xlsx 8203.2A@-20℃.xlsx

4073.Send to TI (GPCRB)V2-21700-1s2p-9600-PANASONIC_report.zip

7 months ago

0 Jonny 7 months ago

TI__Mastermind 24531 points

Hello,

Did you make sure to also load the chemdat12_ID7473 onto the gauge?

Regards,

Robert.

0 q h 7 months ago in reply to Jonny

Intellectual 260 points

Hi Robert.

I have load the chemdat12_ID7473 onto the gauge, I know it include RB table, The SOC accuracy of 1A low-temperature discharge is OK, but the SOC accuracy of 2A low-temperature discharge will become worse. Is there any way to improve the low-temperature discharge of 2A?

0 Jonny 7 months ago in reply to q h

TI__Mastermind 24531 points

Hello,

Can you share your gg file with me?

Regards,

Robert.

0 q h 7 months ago in reply to Jonny

Intellectual 260 points

Hi Robert

8816.gg_out.gg.csv

The attachment is gg.file

0 Jonny 7 months ago in reply to q h

TI__Mastermind 24531 points

Hello,

Please expect a delay while I look into this.

Regards,

Robert.

0 q h 6 months ago in reply to Jonny

Intellectual 260 points

HI Robert

could you help to solve my iSSue?

0 Jonny 6 months ago in reply to q h

TI__Mastermind 24531 points

Hello,

How are you calculating the accuracy of SoC?

Regards,

Jonny.

0 q h 6 months ago in reply to Jonny

Intellectual 260 points

Attached is my test data

0 Jonny 6 months ago in reply to q h

TI__Mastermind 24531 points

Hello,

After looking over your files, I believe the issue could be related to the load mode that you have the gauge configured for. In your files, you have the gauge load mode configured for constant power (load mode = 1), when in reality the load is truly a constant current load. I recommend changing load mode to be 0.

Regards,

Jonny.

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BQ27Z746: BQ27Z746_Low temperature optimization