BQ35100: Best/most compatible CHEM_IDs for the following batteries (bq35100, primary cells)

craig

Part Number: BQ35100

Tool/software:

XENO-Thionyl Chloride Lithium XL-145F

8500mAh
3.6V nominal, 2.0V cutoff

XENO-Thionyl Chloride Lithium XL-205F

19000mAh, 3.6V nominal, 2.0V cutoff

5 months ago

0 Siddharth Venkatesan 5 months ago

TI__Intellectual 2020 points

Hello Craig,

If you need a ChemID for the battery, you can send it to our labs. However, for Li-SOCl2 batteries, you can configure the gauge for End of Service mode using the Application notes below.

How to Configure the BQ35100 for EOS Mode (ti.com)

Using EoS mode, you do not need to have a ChemID programmed.

Regards,

Siddharth

0 craig 5 months ago in reply to Siddharth Venkatesan

Intellectual 510 points

Here: This post seems to imply the chem_id is NOT needed in accumulator mode.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/849933/bq35100-bq35100-battery-characterization

which is referenced in this post:

e2e.ti.com/.../4977569

Can you guys make this clearer in the documentation?

Seems like Accumulator mode is the most accurate assuming you know your off-state current draw?

1)Accumulator mode DOES NOT need CHEMID?

2)The EOS Mode DOES NOT need CHEM_ID, but it still needs to be trained/learn?

3)Accumulator mode is more accurate for SOC, EOS mode is better for detecting EOS (SOC not very accurate while the resistance is flat)?

+1 Adrian 5 months ago in reply to craig

TI__Mastermind 28246 points

Hello Craig,

The best mode will depend on what chemistry of battery you are using. If you are using a Lithium Thionyl Chloride battery, then the best mode is the EOS mode. The best mode for lithium manganese dioxide is SOH mode.

1. Accumulator does not need ChemID.

2. EOS mode does not need ChemID. The battery needs to be learned so the correct trend detection value can be used for the application.

3. Yes accumulator mode is more accurate for SOC. When using EOS mode, the SOC value is not accurate and should be disregarded.

Regards,

Nick Richards

Power management

Power management forum

BQ35100: Best/most compatible CHEM_IDs for the following batteries (bq35100, primary cells)